WO2021149159A1

WO2021149159A1 - Terminal, base station, and communication method

Info

Publication number: WO2021149159A1
Application number: PCT/JP2020/001972
Authority: WO
Inventors: 慎也熊谷; 聡永田; リフェワン; ギョウリンコウ
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2021-07-29

Abstract

This terminal has: a reception unit for receiving, from a base station, upper layer signaling by which a plurality of uplink transmission opportunities are set; a transmission unit for transmitting, to the base station, uplink transmission using at least one of the plurality of uplink transmission opportunities, on the basis of the upper layer signaling; and a control unit for receiving, from the base station, downlink feedback information including information about retransmission control corresponding to the uplink transmission that is not transmitted using the plurality of uplink transmission opportunities and for executing retransmission control relating to the non-transmitted uplink transmission on the basis of the information about the retransmission control.

Description

Terminals, base stations and communication methods

The present invention relates to terminals, base stations and communication methods in wireless communication systems.

In NR (New Radio) (also called "5G"), which is the successor system to LTE (Long Term Evolution), the requirements are a large-capacity system, high-speed data transmission speed, low delay, and simultaneous operation of many terminals. Technologies that satisfy connection, low cost, power saving, etc. are being studied.

Further, in the existing LTE system, in order to expand the frequency band, the frequency band licensed by the telecommunications carrier (operator) (the frequency band different from the licensed band (unlicensed band), unlicensed". The use of carriers (also called unlicensed carriers) and unlicensed CCs (also called unlicensed CCs) is supported. As unlicensed bands, for example, Wi-Fi (registered trademark) or Bluetooth (registered trademark) can be used2. .4 GHz band, 5 GHz band, 6 GHz band, etc. are assumed.

Specifically, Rel-13 supports carrier aggregation (CA) that integrates licensed band carriers (CC) and unlicensed band carriers (CC). Communication performed using the unlicensed band together with the license band in this way is referred to as License-Assisted Access (LAA).

In a wireless communication system that communicates with a licensed band using an unlicensed band, a base station device (downlink) and a user terminal (uplink) are placed on another device (for example, a base) before transmitting data in the unlicensed band. Channel sensing (carrier sense) is performed to confirm the presence / absence of transmission of a station device, a user terminal, a Wi-Fi device, etc.). As a result of sensing, if it is confirmed that there is no transmission of other devices, a transmission opportunity can be obtained and transmission can be performed. This operation is called LBT (Listen Before Talk). Further, in NR, a system that supports an unlicensed band is called an NR-U system.

In NR-U, for example, depending on CG (Configured grant), a plurality of PUSCH (Physical Uplink Shared Channel) transmission opportunities that carry different or the same transport blocks may be set in the terminal. The terminal may transmit the PUSCH at any set transmission opportunity. The base station that has received the PUSCH transmitted using the plurality of PUSCH transmission opportunities and the PUSCH scheduled by the uplink link grant has DFI (Downlink feedback information) including a HARQ (Hybrid automatic repeat request) response corresponding to each PUSCH. ) Needs to be sent to the terminal. However, the details of the bitmap of the HARQ response included in DFI have not been defined.

The present invention has been made in view of the above points, and an object of the present invention is to signal a plurality of HARQ (Hybrid automatic repeat request) responses corresponding to a plurality of PUSCHs (Physical Uplink Shared Channels) in a wireless communication system. ..

According to the disclosed technique, at least one of the receiving unit that receives the upper layer signaling that sets a plurality of uplink transmission opportunities from the base station and the plurality of uplink transmission opportunities based on the upper layer signaling. Receives downlink feedback information from the base station, including a transmitter that transmits the uplink transmission to the base station and information related to retransmission control corresponding to the uplink transmission that was not transmitted at the plurality of uplink transmission opportunities. , A terminal having a control unit that executes the retransmission control related to the uplink transmission that was not transmitted based on the information related to the retransmission control is provided.

According to the disclosed technology, it is possible to signal a plurality of HARQ (Hybrid automatic repeat request) responses corresponding to a plurality of PUSCHs (Physical Uplink Shared Channels) in a wireless communication system.

It is a figure which shows the structural example of the wireless communication system in embodiment of this invention. It is a figure for demonstrating the wireless communication system in embodiment of this invention. It is a sequence diagram for demonstrating an example of signaling in Embodiment of this invention. It is a figure for demonstrating the example (1) of transmission / reception of PUSCH in embodiment of this invention. It is a figure for demonstrating the example (2) of transmission / reception of PUSCH in embodiment of this invention. It is a figure which shows an example of the functional structure of the base station 10 in embodiment of this invention. It is a figure which shows an example of the functional structure of the terminal 20 in embodiment of this invention. It is a figure which shows an example of the hardware composition of the base station 10 or the terminal 20 in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

Existing technology is appropriately used in the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technology is, for example, an existing LTE, but is not limited to the existing LTE. Further, the term "LTE" used in the present specification shall have a broad meaning including LTE-Advanced and LTE-Advanced and later methods (eg, NR) unless otherwise specified.

Further, in the embodiment of the present invention described below, SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical) used in the existing LTE. Terms such as random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) are used. This is for convenience of description, and signals, functions, etc. similar to these may be referred to by other names. Further, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH and the like. However, even if it is a signal used for NR, it is not always specified as "NR-".

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other system (for example, Flexible Duplex, etc.). Method may be used.

Further, in the embodiment of the present invention, "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.

FIG. 1 is a diagram showing a configuration example of a wireless communication system according to the embodiment of the present invention. The wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20 as shown in FIG. Although FIG. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the radio signal are defined in the time domain and the frequency domain, the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain is defined by the number of subcarriers or the number of resource blocks. May be good. The base station 10 transmits a synchronization signal and system information to the terminal 20. Synchronous signals are, for example, NR-PSS and NR-SSS. The system information is transmitted by, for example, NR-PBCH, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 by DL (Downlink), and receives the control signal or data from the terminal 20 by UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Further, the terminal 20 may perform communication via the primary cell of the base station 10 by DC (Dual Connectivity) and the primary secondary cell (PSCell: Primary Secondary Cell) of another base station 10.

The terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 on the DL and transmits the control signal or data to the base station 10 on the UL, thereby providing various types provided by the wireless communication system. Use communication services.

FIG. 2 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. FIG. 2 shows a configuration example of a wireless communication system when NR-DC (NR-Dual connectivity) is executed. As shown in FIG. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to the core network 30. The terminal 20 communicates with both the base station 10A and the base station 10B.

The cell group provided by the MN base station 10A is called an MCG (Master Cell Group), and the cell group provided by the SN base station 10B is called an SCG (Secondary Cell Group). The operation described later may be performed in any of the configurations shown in FIGS. 1 and 2.

In the wireless communication system according to the present embodiment, the above-mentioned LBT is executed. The base station 10 or the terminal 20 acquires COT (Channel Occupancy Time) when the LBT result is idle (when the LBT is successful), performs transmission, and when the LBT result is busy (LBT-busy). , Do not send.

The wireless communication system in the present embodiment may perform a carrier aggregation (CA) operation using an unlicensed CC and a licensed CC, or perform a dual connectivity (DC) operation using the unlicensed CC and the licensed CC. Alternatively, a stand-alone (SA) operation using only an unlicensed CC may be performed. CA, DC, or SA may be performed by any one system of NR and LTE. DC may be performed by at least two of NR, LTE, and other systems.

The terminal 20 uses a signal (for example, a Reference Signal (RS) such as Demodulation Reference Signal (DMRS)) in the PDCCH or the group common PDCCH (group common (GC) -PDCCH) for detecting the transmission burst from the base station 10. ) May exist.

The base station 10 may transmit a specific PDCCH (PDCCH or GC-PDCCH) including a specific DMRS notifying the start of the COT at the start of the COT triggered by the base station apparatus. At least one of the specific PDCCH and the specific DMRS may be referred to as a COT start notification signal. For example, the base station 10 transmits a COT start notification signal to one or more terminals 20, and the terminal 20 can recognize the COT when the specific DMRS is detected.

In release 16NR-U, CG (Configured) that sets and activates transmission opportunities of a plurality of different PUSCHs or the same PUSCH over a plurality of slots / multiple mini-slots by upper layer signaling and DCI (Downlink Control Information). It is supposed to use grant). In addition, "transmission opportunity" may be paraphrased as "time and / or frequency resource".

CG sets multiple PUSCH transmission opportunities to transmit different or the same TB (Transport block). One TB is mapped to one slot or one minislot and transmitted at one PUSCH transmission opportunity. One HARQ (Hybrid automatic repeat request) process is assigned to one PUSCH that transmits the one TB.

For multiple PUSCHs transmitted by CG, the terminal 20 assigns one of unused HARQ process IDs to the TB transmitted by each PUSCH in the case of the first transmission, and NDI (New data indicator) and RV. The base station 10 is notified by the CG uplink control information (CG-UCI) transmitted by the CG-PUSCH together with the (Redundancy version). When the TB transmitted by each PUSCH is retransmitted, the HARQ process ID assigned to the TB at the time of the first transmission is notified to the base station 10 by the CG-UCI transmitted by the CG-PUSCH together with the NDI and RV.

Further, in NR-U, a notification method of the LBT category in the COT acquired by the base station 10 is being studied. For example, the LBT category may be notified as part of a slot format indicator (SFI). The LBT category may be defined as follows, for example.

"Category 1" corresponds to a channel access method that performs immediate transmission after a switching gap. It is used in the case of immediate transmission after the switching gap in the COT acquired by the base station 10. The switching gap from reception to transmission is a gap required for switching between the transceiver and does not exceed 16 μs.

"Category 2" corresponds to a channel access method that performs LBT without random backoff. The period for sensing whether the channel is idle before performing transmission is fixed. For example, in category 2, 25 μs LBT may be executed or 16 μs LBT may be executed. The "channel access method" may be referred to as "LBT type".

"Category 3" corresponds to the channel access method of performing LBT using a fixed size contention window with random backoff. In the category 3 LBT procedure, the transmitter determines a random number N in the contention window. The size of the contention window is specified by a minimum value and a maximum value N. The size of the category 3 contention window is fixed. Random number N is used in the LBT procedure to determine how long to sense if a channel is idle before performing a transmission.

"Category 4" corresponds to the channel access method of performing LBT using a variable size contention window with random backoff. In the category 4 LBT procedure, the transmitter determines a random number N in the contention window. The size of the contention window is specified by a minimum value and a maximum value N. The size of the category 4 contention window is variable. Random number N is used in the LBT procedure to determine how long to sense if a channel is idle before performing a transmission. In addition, category 3 may be included in category 4 as one case of category 4.

FIG. 3 is a sequence diagram for explaining an example of signaling in the embodiment of the present invention. The base station 10 may set a plurality of PUSCH transmission opportunities for the terminal 20.

In step S1, the base station 10 notifies the terminal 20 of the settings related to the set grant type 1 or type 2 via higher layer signaling. For example, in the configured grant type 1, the time and / or time resource in which the PUSCH can be transmitted is set. For example, in the configured grant type 2, the configured grant set via higher layer signaling is activated by DCI. The configured grant may be described as CG (Configured grant).

In step S2, the base station 10 transmits a DCI that activates CG type 2 to the terminal 20 via the PDCCH. Subsequently, the terminal 20 transmits data to the base station 10 via one or a plurality of CG-PUSCHs determined based on the received CG settings (S3). Subsequently, the base station 10 transmits CG-DFI (Downlink feedback information) including a HARQ response corresponding to the received CG-PUSCH to the terminal 20 (S4).

Here, in NR-U, CG-DFI may at least support the matters shown in 1) -4) below.
1) CG-DFI includes at least a transport-level HARQ-ACK bitmap for all UL-HARQ processes.
2) The maximum number of HARQ processes may be the same as in Release 15.
3) The RRC may set a minimum period "D" from the end symbol of the PUSCH to the start symbol of the DFI carrying the HARQ-ACK corresponding to the PUSCH. The terminal 20 assumes that HARQ-ACK is valid only for the PUSCH transmission that ended before "n-D". “N” corresponds to the start symbol of DFI. The shortest period during slot aggregation may be defined.
4) The complexity of terminal-side blind decoding does not increase with DFI size.

Further, DFI may be transmitted using PDCCH scrambled by CS-RNTI (Configured Scheduling-Radio Network Temporary Identifier). The DFI size may be similar to the DCI that grants the UL, or may be matched to the size of the DCI format 0-1 that grants the UL. When CG-PUSCH type 1 and / or type 2 is set, a 1-bit flag may be used to distinguish between DCI and DFI that enable or disable CG transmission.

In addition, DFI may include the information shown in 1) -5) below.
1) UL / DL flag 2) When cross-carrier scheduling is set CIF (Carrier indicator field)
3) 1-bit flag described above 4) HARQ bitmap 5) TPC command (for example, 2 bit length)

Further, in CG type 1, it is assumed that the terminal 20 has DFI only when CG is set. In CG type 2, the terminal 20 assumes that DFI exists only when CG is set and the terminal 20 is in the enabled state for CG transmission.

Further, in NR-U, DCI format 0_1 is used for scheduling one or more PUSCHs in one cell or notifying the terminal 20 of CG-DFI. The information shown in 1) -5) below is C-RNTI (Cell-RNTI), CS-RNTI, SP-CSI-RNTI (Semi-Persistent Channel State Information-RNTI) or MCS-C-RNTI (Modulation and). It may be transmitted in DCI format 0-1 with CRC scrambled by Coding Scheme C-RNTI).

1) DCI format identifier In the case of the 1-bit UL-DCI format, the value is always set to "0".
2) CIF This is valid when 0-bit or 3-bit cross-carrier scheduling is set.
3) DFI flag When configured to monitor DCI format 0_1 with CRC scrambled with 0-bit or 1-bit CS-RNTI and when performing channel access sharing a spectrum in the cell (ie NR-U) 1 bit is set. In the case of DCI format 0_1 with CRC scrambled from CS-RNTI, the 1-bit value "0" indicates the activation of CG type 2 transmission, and the 1-bit value "1" indicates CG-DFI. If DCI format 0_1 is accompanied by a CRC scrambled with C-RNTI, SP-CSI-RNTI or MCS-C-RNTI, the 1 bit is reserved. In cases other than the above, the field is set to 0 bits.

When DCI format 0_1 notifying CG-DFI is used, the remaining fields are set as follows.
4) HARQ-ACK Bitmap The 16-bit HARQ process index is mapped to the bitmap in ascending order from MSB (Most significant bit) to LSB (Least significant bit). For each bit in the bitmap, a value "1" indicates ACK (positive response) and a value "0" indicates NACK (negative response). The terminal 20 executes the retransmission control related to the transmitted CG-PUSCH based on the HARQ-ACK bitmap included in the received CG-DFI.
5) TPC command for scheduled PUSCH 2 bits All the remaining bits in the DCI format are set to "0".

Here, it is necessary to determine how to set the HARQ-ACK value corresponding to the HARQ process that may not be identified from the viewpoint of the base station 10 in the HARQ-ACK bitmap notified by CG-DFI. There is.

In the dynamically assigned PUSCH, since the base station 10 allocates the HARQ process in the UL grant, whether or not the HARQ process is used is grasped by the base station 10. Therefore, when the terminal 20 fails to detect the UL grant and transmits DTX, the base station 10 feeds back NACK and executes rescheduling for the HARQ process. Further, when the base station 10 fails to detect or decode the PUSCH transmitted by the terminal 20 based on the UL grant, the base station 10 feeds back NACK and executes rescheduling for the HARQ process.

FIG. 4 is a diagram for explaining an example (1) of transmission / reception of PUSCH in the embodiment of the present invention. In a CG-PUSCH without an associated DCI or UL grant, as shown in FIG. 4, the terminal 20 transmits the CG-PUSCH and the base station 10 corresponds to the HPN (HARQ process number) # 0 CG-. It is assumed that the detection of PUSCH is successful and the detection of CG-PUSCH corresponding to HPN # 1 fails. The base station 10 cannot determine whether the terminal 20 did not transmit the CG-PUSCH due to the buffer emptyness, or the terminal 20 transmitted the CG-PUSCH but the base station 10 could not be detected. Here, for example, when ACK is set for the HARQ-ACK feedback corresponding to HPN # 1, the terminal 20 determines that the CG-PUSCH corresponding to HPN # 1 has been successfully transmitted, which causes a problem in operation. ..

Therefore, in the HARQ-ACK bitmap notified by CG-DFI, the HARQ-ACK value corresponding to the HARQ process that may not be identified from the viewpoint of the base station 10 side or the unused HARQ process is referred to as a) below. -C) may be set as follows.

a) Set a fixed value NACK. FIG. 5 is a diagram for explaining an example (2) of transmission / reception of PUSCH according to the embodiment of the present invention. As shown in FIG. 5, when the base station 10 cannot detect the CG-PUSCH corresponding to HPN # 1, a fixed value NACK is set as the bit of the corresponding HARQ-ACK bitmap included in the CG-DFI. It may be set. The CG-PUSCH corresponding to HPN # 1 may or may not be transmitted to the terminal 20. If the terminal 20 does not transmit the CG-PUSCH corresponding to HPN # 1, it is determined that the base station 10 has not detected the CG-PUSCH, NACK is fed back, and the corresponding HARQ process is rescheduled. Even if it is executed, since the terminal 20 recognizes that the CG-PUSCH is not transmitted, the operation is not hindered by transmitting new data at the retransmission opportunity.

By setting a fixed value NACK in the HARQ-ACK bitmap corresponding to the HPN that the base station 10 could not detect, the terminal 20 does not transmit the CG-PUSCH and the terminal 20 transmits the CG-PUSCH. However, both when the base station 10 cannot detect the CG-PUSCH, the operation related to HARQ can be executed without any trouble.

b) Set a fixed value ACK. By setting a fixed value ACK to the bits of the HARQ-ACK bitmap corresponding to the HPN that the base station 10 could not detect, the operation of lower layers such as the PHY layer and the MAC layer can be simplified.

c) The base station 10 determines without defining a fixed value. By setting the value determined by the base station 10 to the bits of the HARQ-ACK bitmap corresponding to the HPN that the base station 10 could not detect, highly flexible HARQ operation becomes possible.

According to the above embodiment, the terminal 20 receives the CG-DFI including HARQ-ACK corresponding to the transmission of the CG-PUSCH, and efficiently controls the retransmission operation of the CG-PUSCH based on the CG-DFI. can.

That is, in a wireless communication system, it is possible to signal a plurality of HARQ (Hybrid automatic repeat request) responses corresponding to a plurality of PUSCHs (Physical Uplink Shared Channels).

(Device configuration)
Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include a function of carrying out the above-described embodiment. However, the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.

<Base station 10>
FIG. 6 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention. As shown in FIG. 6, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 6 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. Further, the transmission unit 110 transmits a message between network nodes to another network node. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals and the like to the terminal 20. In addition, the receiving unit 120 receives a message between network nodes from another network node.

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, a setting related to NR-U communication.

The control unit 140 controls the UL grant or CG as described in the embodiment. Further, the control unit 140 controls the transmission of the CG-DFI including the HARQ response corresponding to the received PUSCH. The function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.

<Terminal 20>
FIG. 7 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention. As shown in FIG. 7, the terminal 20 has a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 7 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals and the like transmitted from the base station 10. Further, for example, the transmission unit 210 connects the other terminal 20 to PSCCH (Physical Sidelink Control Channel), PSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication. Etc., and the receiving unit 220 receives the PSCCH, PSCH, PSDCH, PSBCH, etc. from the other terminal 20.

The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores preset setting information. The content of the setting information is, for example, a setting related to NR-U communication.

As described in the embodiment, the control unit 240 controls to execute the transmission accompanied by the LBT based on the CG. Further, the control unit 240 executes PUSCH transmission together with HARQ control based on CG. The function unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the function unit related to signal reception in the control unit 240 may be included in the reception unit 220.

(Hardware configuration)
The block diagrams (FIGS. 6 and 7) used in the description of the above embodiment show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. There are broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these. I can't. For example, a functional block (constituent unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). As described above, the method of realizing each of them is not particularly limited.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 8 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For each function of the base station 10 and the terminal 20, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the above-mentioned control unit 140, control unit 240, and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 140 of the base station 10 shown in FIG. 6 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 7 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, for example, by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory) and the like. It may be configured. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu). -It may be composed of at least one of a ray® disc), a smart card, a flash memory (eg, a card, a stick, a key drive), a floppy® disc, a magnetic strip, and the like. The storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of. For example, the transmission / reception antenna, the amplifier unit, the transmission / reception unit, the transmission line interface, and the like may be realized by the communication device 1004. The transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Summary of embodiments)
As described above, according to the embodiment of the present invention, the receiving unit that receives the upper layer signaling that sets a plurality of uplink transmission opportunities from the base station, and the plurality of upper layer signalings based on the upper layer signaling. A transmitter that transmits uplink transmission to the base station at at least one of the uplink transmission opportunities, and downlink that includes information related to retransmission control corresponding to uplink transmission that was not transmitted at the plurality of uplink transmission opportunities. A terminal having a control unit that receives link feedback information from the base station and executes retransmission control related to uplink transmission that was not transmitted based on the information related to retransmission control is provided.

With the above configuration, the terminal 20 can receive the CG-DFI including HARQ-ACK corresponding to the transmission of the CG-PUSCH, and can efficiently control the retransmission operation of the CG-PUSCH based on the CG-DFI. .. That is, in a wireless communication system, it is possible to signal a plurality of HARQ (Hybrid automatic repeat request) responses corresponding to a plurality of PUSCHs (Physical Uplink Shared Channels).

The control unit may transmit new data as retransmission control when the information related to the retransmission control is a negative response. With this configuration, when the terminal 20 does not transmit the CG-PUSCH, the operation related to HARQ can be executed without any trouble.

Further, according to the embodiment of the present invention, among the transmission unit that transmits the upper layer signaling that sets a plurality of uplink transmission opportunities to the terminal and the plurality of uplink transmission opportunities based on the upper layer signaling. A negative response is given as a fixed value to all of the information related to the retransmission control corresponding to the uplink transmission not detected by the plurality of uplink transmission opportunities, and the receiver that receives the uplink transmission from the terminal at least one. A base station is provided that has a control unit that is set and transmits downlink feedback information including information related to the retransmission control to the terminal.

Further, according to the embodiment of the present invention, the reception procedure for receiving the upper layer signaling for setting a plurality of uplink transmission opportunities from the base station and the plurality of uplink transmission opportunities based on the upper layer signaling. The downlink feedback information including the transmission procedure for transmitting the uplink transmission to the base station at least one of them and the information related to the retransmission control corresponding to the uplink transmission that was not transmitted at the plurality of uplink transmission opportunities is described above. A communication method is provided in which the terminal executes a control procedure for executing the retransmission control related to the uplink transmission that was not transmitted, based on the information received from the base station and related to the retransmission control.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed inventions are not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, substitutions, and the like. There will be. Although explanations have been given using specific numerical examples in order to promote understanding of the invention, these numerical values are merely examples and any appropriate value may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in combination with another item. It may be applied (as long as there is no contradiction) to the matters described in. The boundary of the functional unit or the processing unit in the functional block diagram does not always correspond to the boundary of the physical component. The operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of processing description, the base station 10 and the terminal 20 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

Further, the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. Broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof may be used. RRC signaling may be referred to as an RRC message, for example, RRC. It may be a connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize suitable systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present specification may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station 10 in the present specification may be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, various operations performed for communication with the terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 ( For example, it is clear that it can be done by at least one of (but not limited to, MME, S-GW, etc.). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). ..

The information, signals, etc. described in the present disclosure can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information and the like may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination in the present disclosure may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example,). , Comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website that uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Note that the terms explained in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC: Component Carrier) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

In this disclosure, "base station (BS: Base Station)", "radio base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB" (GNB) ”,“ access point ”,“ transmission point ”,“ reception point ”,“ transmission / reception point ”,“ cell ”,“ sector ”, Terms such as "cell group," "carrier," and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.

In the present disclosure, terms such as "mobile station (MS: Mobile Station)", "user terminal", "user device (UE: User Equipment)", and "terminal" may be used interchangeably. ..

Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, and the like may be read as a side channel.

Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station may have the functions of the user terminal described above.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energies having wavelengths in the microwave and light (both visible and invisible) regions.

The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) depending on the applicable standard.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first" and "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.

The "means" in the configuration of each of the above devices may be replaced with "part", "circuit", "device" and the like.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

The wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further consist of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology includes, for example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, wireless frame configuration, and transceiver. At least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). Slots may be in time units based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. A minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as the PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.

For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI. You may. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station schedules each terminal 20 to allocate radio resources (frequency bandwidth that can be used in each terminal 20, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of the RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth part (BWP: Bandwidth Part) (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a certain neurology in a carrier. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, minislots and symbols are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained in a slot, the number of symbols and RBs contained in a slot or minislot, and the number of RBs. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and other configurations can be changed in various ways.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

In this disclosure, CG-PUSCH is an example of a plurality of uplink transmissions. DCI is an example of downlink control information. The HARQ bitmap included in the CG-DFI is an example of information related to retransmission control corresponding to a plurality of uplink transmissions. CG-DFI is an example of downlink feedback information.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as an amendment or modification without departing from the purpose and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of the present disclosure is for the purpose of exemplary explanation and does not have any limiting meaning to the present disclosure.

10 Base station 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 30 Core network 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

A receiver that receives upper layer signaling from a base station that sets multiple uplink transmission opportunities, and
A transmission unit that transmits uplink transmission to the base station at at least one of the plurality of uplink transmission opportunities based on the upper layer signaling.
The downlink feedback information including the information related to the retransmission control corresponding to the uplink transmission that was not transmitted at the plurality of uplink transmission opportunities is received from the base station, and the transmission is performed based on the information related to the retransmission control. A terminal having a control unit that executes retransmission control related to uplink transmission that has not been performed.
The terminal according to claim 1, wherein the control unit transmits new data as retransmission control when the information related to the retransmission control is a negative response.
A transmitter that sends upper layer signaling to the terminal that sets multiple uplink transmission opportunities,
A receiving unit that receives uplink transmission from the terminal at at least one of the plurality of uplink transmission opportunities based on the upper layer signaling.
A negative response is set as a fixed value for all the information related to the retransmission control corresponding to the uplink transmission not detected by the plurality of uplink transmission opportunities, and the downlink feedback information including the information related to the retransmission control is described above. A base station having a control unit that transmits to a terminal.
A reception procedure for receiving upper layer signaling from a base station that sets multiple uplink transmission opportunities, and
A transmission procedure for transmitting an uplink transmission to the base station at at least one of the plurality of uplink transmission opportunities based on the upper layer signaling.
The downlink feedback information including the information related to the retransmission control corresponding to the uplink transmission that was not transmitted at the plurality of uplink transmission opportunities is received from the base station, and the transmission is performed based on the information related to the retransmission control. A communication method in which the terminal executes a control procedure for executing retransmission control related to uplink transmission that has not been performed.