JP7455539B2 - Terminal device and communication method - Google Patents

Description

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

Wireless access methods and wireless networks for cellular mobile communications (hereinafter referred to as “Long T
erm Evolution (LTE)” or “EUTRA: Evolved U
Universal Terrestrial Radio Access. ) is being considered in 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 a plurality of areas covered by base station devices are arranged in a cell shape. A single base station device may manage multiple serving cells.

In 3GPP, the next generation standard (NR: Consideration of New Radio) (Non-patent Document 1). NR combines eMBB (enhanced Mobile Broadband), mMTC (massive Mach
ine Type Communication), URLLC (Ultra Relia
There is a need to satisfy the requirements assuming three scenarios: low latency and low latency communication.

Further, the application of NR to unlicensed frequency bands (Unlicensed Spectrum) is being considered (Non-Patent Document 2). It is being considered to apply NR that supports a wide band of 100 MHz to carriers in unlicensed frequency bands to achieve data rates of several Gbps.

"New SID proposal: Study on New Radio Access Technology", RP-160671, NTT docomo, 3GPP TSG RAN Meeting #71, Goteborg, Sweden, 7th-10th March, 2016.

"New WID on NR-based Access to Unlicensed Spectrum", RP-182878, Qualcomm Incorporated, 3GPP TSG RAN Meeting #82, Sorrento, Italy, 10th - 13th December, 2018.

In some countries around the world, it is necessary to apply Listen-Before-Talk (LBT) in unlicensed frequency bands. Carrier sense is performed before transmission starts, and transmission is possible within a predetermined length of time only when it is confirmed by carrier sense that the resource (channel, frequency band) is not applied to other nearby systems. The mechanism is LBT.

In order to be able to appropriately control data retransmission, the data receiving side must notify the data sending side of the data error detection results, the data reception results (whether the received data was correct, whether the data was received correctly, etc.). It is necessary to provide appropriate feedback regarding errors in data, data not received, etc. The data transmitting side retransmits data that was not properly received by the receiving side based on information fed back from the data receiving side. For example, the data transmitting side is a base station device, the data receiving side is a terminal device, the data is a transport block (transport block transmitted and received on PDSCH), and the data error detection results and reception results are This is HARQ-ACK. Efficient communication is achieved by implementing appropriate retransmission control.

The present invention realizes the application of NR while applying LBT in an unlicensed frequency band. The present invention provides a terminal device that can communicate efficiently, a communication method used in the terminal device, a base station device that can communicate efficiently, and a communication method used in the base station device. provide.

(1) A first aspect of the present invention is a terminal device comprising a processor and a memory storing a computer program code, the terminal device following a slot in which it is determined that a base station device is transmitting a signal. monitoring PDCCH candidates in a first search area from the slot to the slot before the slot in which transmission of HARQ-ACK is instructed; and monitoring PDCCH candidates in a slot after the slot in which transmission of HARQ-ACK is instructed; and monitoring PDCCH candidates at.

(2) The first aspect of the present invention further performs operations including, when an instruction to postpone transmission of HARQ-ACK is received, monitoring PDCCH candidates in the first search area up to the slot until expiration of a timer, and monitoring PDCCH candidates in the second search area in the slot after expiration of the timer.

(3) In the first aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

(4) A second aspect of the present invention is a communication method used in a terminal device, in which HARQ-ACK transmission is instructed from a slot after a slot in which a base station device is determined to be transmitting a signal. monitoring PDCCH candidates in a first search area up to the slot before the slot in which the HARQ-ACK is transmitted; and monitoring PDCCH candidates in a second search area in slots after the slot in which transmission of the HARQ-ACK is instructed. ,including.

(5) The second aspect of the present invention further provides the step of monitoring PDCCH candidates in the first search area until the timer expires, when the transmission of HARQ-ACK is instructed to be postponed. and monitoring PDCCH candidates in the second search area in slots after the timer expires.

(6) In the second aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

(7) A third aspect of the present invention is a base station device comprising a processor and a memory storing a computer program code, the base station device transmitting HARQ-ACK from a slot after a slot in which signal transmission is started. A first search area is set for the terminal device up to the slot before the slot in which transmission of the HARQ-ACK is instructed, and a second search area is set in the terminal device in the slot after the slot in which the transmission of the HARQ-ACK is instructed. perform actions, including configuring

(8) In a third aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

(9) A fourth aspect of the present invention is a communication method used in a base station device, which starts from a slot after a slot in which signal transmission is started and a slot before a slot in which transmission of HARQ-ACK is instructed. and setting a second search area for the terminal device in a slot after the slot in which transmission of the HARQ-ACK is instructed. include.

(10) In a fourth aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

According to this invention, the terminal device can communicate efficiently. Furthermore, the base station device can communicate efficiently. The terminal device can communicate efficiently without increasing the processing load on the terminal device. The base station device can communicate efficiently without increasing the processing load on the terminal device.

FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. 3 is an example showing a relationship among N ^slot _symb , subcarrier interval setting μ, slot setting, and CP setting according to one aspect of the present embodiment. 1 is an example showing a configuration of a radio frame, a subframe, and a slot according to an aspect of the present embodiment. FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. FIG. 2 is a diagram illustrating an example of the configuration of one REG according to one aspect of the present embodiment. FIG. 2 is a diagram illustrating a configuration example of a CCE according to one aspect of the present embodiment. FIG. 7 is a diagram illustrating an example of the relationship between the number of REGs forming a group of REGs and a mapping method of PDCCH candidates according to an aspect of the present embodiment. FIG. 1 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. 1 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of the present embodiment. FIG. FIG. 3 is a diagram illustrating an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. FIG. 3 is a diagram illustrating an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. FIG. 3 is a diagram illustrating an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. FIG. 3 is a diagram illustrating an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. FIG. 7 is a diagram illustrating an example of determination regarding setting of a search area according to an aspect of the present embodiment.

Embodiments of the present invention will be described below.

“A and/or B” may be a term that includes “A”, “B”, or “A and B”.

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

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

The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG is a group of serving cells including at least a PCell (Primary Cell). SCG is at least PSCell (Primary S
This is a group of serving cells that includes secondary cells. P
Cell may be a serving cell provided based on initial connection. The MCG may be configured to include one or more SCells (Secondary Cells).
The SCG may be configured to include one or more SCells. A serving cell identity is a short identifier for identifying a serving cell. The serving cell identifier may be given by higher layer parameters.

The frame configuration will be explained below.

In the wireless communication system according to one aspect of the present embodiment, at least OFDM (Orthogonal Frequency Division Multiplex) is used. An OFDM symbol is a time domain unit of OFDM. An OFDM symbol includes at least one or more subcarriers. OFDM symbols may be converted into a time-continuous signal in baseband signal generation.

Subcarrier spacing (SCS) may be given by subcarrier spacing Δf=2 ^μ ·15 kHz. For example, subcarrier spacing configuration μ may be set to 0, 1, 2, 3, 4, and/or 5. For a certain BWP (Band Width Part), the subcarrier spacing setting μ may be given by an upper layer parameter.

In the wireless communication system according to one aspect of the present embodiment, a time unit (time unit) _Tc is used to express the length of the time domain. The time unit T _c may be given by T _c =1/(Δf _max ·N _f ). Δf _max may be the maximum value of subcarrier spacing supported in the wireless communication system according to one aspect of the present embodiment. Δf _max may be Δf _max =480kHz. N _f may be N _f =4096. The constant κ is κ=Δf _max ·N _f /(Δf _ref N _f,ref )=64. Δf _ref may be 15kHz. N _f,ref may be 2048.

The constant κ may be a value indicating the relationship between the reference subcarrier interval and T _c . A constant κ may be used for the subframe length. The number of slots included in a subframe may be given based at least on the constant κ. Δf _ref is a reference subcarrier interval, and N _f,ref is a value corresponding to the reference subcarrier interval.

Transmission on the downlink and/or transmission on the uplink consists of 10 ms frames. A frame includes 10 subframes. The length of a subframe is 1 ms. The frame length may be given regardless of the subcarrier interval Δf. In other words, the frame settings may be given regardless of μ. The length of the subframe may be given regardless of the subcarrier interval Δf. In other words, the subframe settings may be given regardless of μ.

For a certain subcarrier spacing setting μ, the number and index of slots included in the subframe may be given. For example, the first slot number n ^μ _s may be given in ascending order within the subframe in the range from 0 to N ^{subframe, μ} _slot −1. For the subcarrier spacing setting μ, the number and index of slots included in the frame may be given. For example, the second slot numbers n ^μ _s,f may be given in ascending order within the frame in the range from 0 to N ^{frame, μ} _slot −1. N ^slot _sym consecutive OFDM symbols may be included in one slot. N ^slot _symb is the slot configuration and/or CP.
yclic Prefix) based on at least some or all of the settings. The slot configuration may be given by at least the upper layer parameter tdd-UL-DL-ConfigurationCommon. The CP settings may be provided based at least on upper layer parameters. CP configuration may be provided based at least on dedicated RRC signaling. The first slot number and the second slot number are also called slot numbers (slot index).

Fig. 2 is an example showing the relationship between N ^slot _symb , subcarrier interval setting μ, slot setting, and CP setting according to one aspect of the present embodiment. In Fig. 2A, when the slot setting is 0, the subcarrier interval setting μ is 2, and the CP setting is normal cyclic prefix (normal CP), N ^slot _symb = 14, N ^{frame, μ} _slot = 40, and N ^{subframe, μ} _slot = 4. 2B , when the slot setting is 0, the subcarrier spacing setting μ is 2, and the CP setting is extended cyclic prefix (CP), N ^slot _symb = 12, N ^{frame, μ} _slot = 40, and N ^{subframe, μ} _slot = 4. N ^slot _symb in slot setting 0 may correspond to twice the N ^slot _symb in slot setting 1.

FIG. 3 is an example showing a configuration of a radio frame, a subframe, and a slot according to one aspect of the present embodiment. In the example shown in FIG. 3, the slot length is 0.5 ms, the subframe length is 1 ms, and the radio frame length is 10 ms. A slot may be a unit of resource allocation in the time domain. For example, a slot may be a unit to which one transport block is mapped. For example, a transport block may be mapped to one slot. Here, the transport block is transmitted within a predetermined interval (for example, Transmission Time Interval (TTI)) defined by an upper layer (for example, MAC: Media Access Control, RRC: Radio Resource Control). It may be a unit of data.

For example, the slot length may be given by the number of OFDM symbols. For example, the number of OFDM symbols may be 7 or 14. The length of the slot may be given based on at least the length of an OFDM symbol. The length of the OFDM symbols may vary based at least on subcarrier spacing. Further, the length of the OFDM symbol may be given based on at least the number of points of Fast Fourier Transform (FFT) used to generate the OFDM symbol. Further, the length of an OFDM symbol may include the length of a cyclic prefix (CP) added to the OFDM symbol. Here, the OFDM symbol may be called a symbol. In addition, when a communication method other than OFDM is used in communication between the terminal device 1 and the base station device 3 (for example, when SC-FDMA or DFT-s-OFDM is used), the generated SC -FDMA symbols and/or DFT-s-OFDM symbols are also referred to as OFDM symbols. Further, unless otherwise specified, OFDM includes SC-FDMA or DFT-s-OFDM.

For example, the slot length may be 0.125ms, 0.25ms, 0.5ms, 1ms. For example, if the subcarrier spacing is 15 kHz, the slot length may be 1 ms. For example, if the subcarrier spacing is 30kHz, the slot length may be 0.5ms. For example, if the subcarrier spacing is 120kHz, the slot length may be 0.125ms. For example, if the subcarrier spacing is 15 kHz, the slot length may be 1 ms. For example, if the slot length is 0.125ms, one subframe may be composed of eight slots. For example, if the slot length is 0.25 ms, one subframe may be composed of four slots. For example, if the slot length is 0.5 ms, one subframe may be composed of two slots. For example, if the slot length is 1 ms, one subframe may consist of one slot.

Here, OFDM includes a multicarrier communication method to which pulse shape, PAPR reduction, out-of-band radiation reduction, filtering, and/or phase processing (eg, phase rotation, etc.) is applied. The multicarrier communication method may be a communication method that generates/transmits a signal in which a plurality of subcarriers are multiplexed.

A radio frame may be given by a number of subframes. The number of subframes for a radio frame may be ten, for example. A radio frame may be given by a number of slots.

The physical resources will be explained below.

Antenna ports are defined in that the channel over which a symbol is conveyed at one antenna port can be estimated from the channel over which other symbols are conveyed at the same antenna port. If the large scale properties of the channel over which symbols are conveyed at one antenna port can be estimated from the channel over which symbols are conveyed at another antenna port, then the two antenna ports are called Quasi Co-Located (QCL). ) is called. The large-scale characteristics may include at least long-range characteristics of the channel. The large-scale characteristic is delay spread (delay sp
read), Doppler spread, Doppler shift (
Doppler shift), average gain, average delay, and beam parameters (spatial Rx para
may include at least some or all of the following: QCL between the first antenna port and the second antenna port in terms of beam parameters means that the receive beam expected by the receiving side for the first antenna port and the received beam expected by the receiving side for the second antenna port. may be the same. The fact that the first antenna port and the second antenna port are QCL with respect to beam parameters means that the transmission beam that the receiving side assumes for the first antenna port and the transmission beam that the receiving side assumes for the second antenna port. may be the same. Terminal device 1 assumes that the two antenna ports are QCL if the large-scale characteristics of the channel in which symbols are transmitted in one antenna port can be estimated from the channel in which symbols are transmitted in another antenna port. may be done. Two antenna ports being QCL may mean that two antenna ports are assumed to be QCL.

For each subcarrier spacing setting and carrier set, a resource grid of N ^μ _RB,× N ^RB _sc subcarriers and N ^(μ) _symb N ^{subframe, μ} _symb OFDM symbols is provided. N ^μ _RB,x may indicate the number of resource blocks given for setting μ of subcarrier spacing for carrier x. N ^μ _RB,x may be the maximum number of resource blocks granted for the subcarrier spacing setting μ for carrier x. Carrier x indicates either a downlink carrier or an uplink carrier. That is, x is "DL" or "UL". N ^μ _RB is a name including N ^μ _{RB, DL} and/or N ^μ _{RB, UL} . N ^RB _sc may indicate the number of subcarriers included in one resource block. At least one resource grid may be provided for each antenna port p, and/or each subcarrier spacing setting μ, and/or each transmission direction setting. The transmission direction includes at least a downlink (DL) and an uplink (UL). Hereinafter, a parameter set including at least part or all of the antenna port p, subcarrier interval setting μ, and transmission direction setting will also be referred to as a first radio parameter set. That is, one resource grid may be provided for each first radio parameter set.

In the downlink, a carrier included in a serving cell is referred to as a downlink carrier (or downlink component carrier). In the uplink, a carrier included in a serving cell is referred to as an uplink carrier (uplink component carrier). A downlink component carrier and an uplink component carrier are collectively referred to as a component carrier (or carrier).

Each element in the resource grid provided for each first radio parameter set is called a resource element. A resource element is specified by an index k _sc in the frequency domain and an index l _sym in the time domain. For a certain first radio parameter set, a resource element is identified by an index k _sc in the frequency domain and an index l _sym in the time domain. The resource element specified by the frequency domain index k _sc and the time domain index l _sym is also referred to as a resource element (k _sc , l _sym ). The frequency domain index k _sc indicates any value from 0 to N ^μ _RB N ^RB _sc −1. N ^μ _RB may be the number of resource blocks given for setting μ of subcarrier spacing. N ^RB _sc is the number of subcarriers included in the resource block, and N ^RB _sc =12. The frequency domain index _ksc may correspond to the subcarrier index _ksc . The time domain index l _sym may correspond to the OFDM symbol index l _sym .

FIG. 4 is a schematic diagram illustrating an example of a resource grid in a subframe according to one aspect of the present embodiment. In the resource grid of FIG. 4, the horizontal axis is the index l _sym in the time domain, and the vertical axis is the index k _sc in the frequency domain. In one subframe, the frequency domain of the resource grid includes N ^μ _RB N ^RB _sc subcarriers. In one subframe, the time domain of the resource grid may include 14·2 ^μ OFDM symbols. One resource block is configured to include N ^RB _sc subcarriers. The time domain of a resource block may correspond to one OFDM symbol. The time domain of a resource block may correspond to 14 OFDM symbols. A time domain of a resource block may correspond to one or more slots. The time domain of a resource block may correspond to one subframe.

The terminal device 1 may be instructed to perform transmission and reception using only a subset of the resource grid. A subset of the resource grid may also be referred to as a BWP, and the BWP may be provided based on at least some or all of the upper layer parameters and/or the DCI. BWP is also referred to as a band part (BP: Bandwidth Part). In other words, the terminal device 1 does not need to be instructed to perform transmission and reception using all sets of resource grids. That is, the terminal device 1 may be instructed to perform transmission and reception using some frequency resources within the resource grid. One BWP may be composed of multiple resource blocks in the frequency domain. One BWP may be composed of a plurality of consecutive resource blocks in the frequency domain. BWP configured for a downlink carrier is also referred to as downlink BWP. BWP configured for uplink carriers is also called uplink BWP.

One or more downlink BWPs may be configured for the terminal device 1. The terminal device 1 may attempt to receive a physical channel (eg, PDCCH, PDSCH, SS/PBCH, etc.) in one downlink BWP of one or more downlink BWPs. The one downlink BWP is also called activated downlink BWP.

One or more uplink BWPs may be configured for the terminal device 1. The terminal device 1 may attempt to transmit a physical channel (for example, PUCCH, PUSCH, PRACH, etc.) in one uplink BWP of one or more uplink BWPs. The one uplink BWP is also called an activated uplink BWP.

A set of downlink BWPs may be configured for each serving cell. The set of downlink BWPs may include one or more downlink BWPs. A set of uplink BWPs may be configured for each serving cell. The set of uplink BWPs may include one or more uplink BWPs.

The upper layer parameter is a parameter included in the upper layer signal. The upper layer signal may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the upper layer signal may be an RRC layer signal or a MAC layer signal.

The upper layer signal may be common RRC signaling. The common RRC signaling may comprise at least some or all of the following features C1 to C3.
Feature C1) Feature mapped to BCCH logical channel or CCCH logical channel Feature C2) Feature including at least a radioResourceConfigCommon information element C3) Map to PBCH

The radioResourceConfigCommon information element may include information indicating settings commonly used in the serving cell. The configuration commonly used in the serving cell may include at least the configuration of PRACH. The PRACH configuration may indicate at least one or more random access preamble indices. The PRACH configuration may at least indicate PRACH time/frequency resources.

The upper layer signals may be dedicated RRC signaling. Dedicated RRC signaling may comprise at least some or all of the following features D1 to D2.
Feature D1) Includes at least a Feature D2) radioResourceConfigDedicated information element mapped to the DCCH logical channel

The radioResourceConfigDedicated information element may include at least information indicating settings specific to the terminal device 1. The radioResourceConfigDedicated information element may include at least information indicating BWP settings. The configuration of the BWP may at least indicate frequency resources of the BWP.

For example, the MIB, the first system information, and the second system information may be included in common RRC signaling. Further, an upper layer message that is mapped to the DCCH logical channel and includes at least radioResourceConfigCommon may be included in common RRC signaling. Additionally, upper layer messages that are mapped to the DCCH logical channel and do not include the radioResourceConfigCommon information element may be included in dedicated RRC signaling. Additionally, an upper layer message that is mapped to the DCCH logical channel and includes at least the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

The first system information may indicate at least a time index of an SS (Synchronization Signal) block. SS block
is also called SS/PBCH block. The SS/PBCH block is also called SS/PBCH. The first system information may include at least information related to PRACH resources. The first system information may include at least information related to initial connection setup. The second system information may be system information other than the first system information.

The radioResourceConfigDedicated information element may include at least information related to PRACH resources. The radioResourceConfigDedicated information element may include at least information related to the initial connection setup.

Hereinafter, physical channels and physical signals according to various aspects of this embodiment will be explained.

An uplink physical channel may correspond to a set of resource elements carrying information originating in upper layers. The uplink physical channel is a physical channel used in an uplink carrier. In the 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)

PUCCH may be used to transmit uplink control information (UCI). Uplink control information includes channel state information (CSI), scheduling request (SR), transport block (TB), and medium access controller (MAC PDU). ol Protocol Data Unit, DL-SCH:Downlink -Shared Channel, HARQ-ACK (Hybrid Au
(Repeat request ACKknowledgement). Note that the uplink control information may include information not described above.

HARQ-ACK may include at least HARQ-ACK bits (HARQ-ACK information) corresponding to at least one transport block. The HARQ-ACK bit is an ACK (acknowledgement) or a NACK (negative-acknowledgement) corresponding to one or more transport blocks.
may also be shown. HARQ-ACK may include at least a HARQ-ACK codebook that includes one or more HARQ-ACK bits. The HARQ-ACK bits corresponding to one or more transport blocks may mean that the HARQ-ACK bits correspond to a PDSCH including the one or more transport blocks. The HARQ-ACK bit may indicate ACK or NACK corresponding to one CBG (Code Block Group) included in the transport block.

A scheduling request (SR) may be used at least to request PUSCH resources for initial transmission. The scheduling request bit may be used to indicate either positive SR (positive SR) or negative SR (negative SR). The fact that the scheduling request bit indicates a positive SR is also referred to as "a positive SR is transmitted." A positive SR may indicate that the terminal device 1 requests PUSCH resources for initial transmission. A positive SR may indicate that the scheduling request is triggered by an upper layer. A positive SR may be sent when directed to send a scheduling request by an upper layer. The fact that the scheduling request bit indicates a negative SR is also referred to as "a negative SR is transmitted." A negative SR may indicate that the terminal device 1 does not request PUSCH resources for initial transmission. A negative SR may indicate that no scheduling request is triggered by the upper layer. A negative SR may be sent if no scheduling request is directed to be sent by the upper layer.

The channel state information may include at least some or all of a channel quality indicator (CQI), a precoder matrix indicator (PMI), and a rank indicator (RI). CQI is a measure related to the quality of the channel (eg, propagation strength), and PMI is a measure that directs the precoder. RI is an index indicating the transmission rank (or the number of transmission layers).

PUCCH may support one or more PUCCH formats (PUCCH format 0 to PUCCH format 4). The PUCCH format may be mapped to PUCCH and transmitted. PUCCH format may be transmitted on PUCCH. Transmitting a PUCCH format may mean transmitting a PUCCH.

PUSCH is a transport block (TB, MAC PDU, UL-SCH, P
USCH). PUSCH may be used to transmit at least some or all of transport blocks, HARQ-ACKs, channel state information, and scheduling requests. PUSCH is used at least to transmit random access messages 3. PUSCH may be used to transmit information not listed above.

PRACH is used at least to transmit a random access preamble (Random Access Message 1). PRACH is used for initial connection establishment procedures, handover procedures, connection re-establishment procedures, synchronization (timing adjustment) for PUSCH transmission, and some or all of the requests for resources for PUSCH. may be used to indicate at least The random access preamble may be used to notify the base station device 3 of an index (random access preamble index) given from an upper layer of the terminal device 1.

In FIG. 1, the following uplink physical signals are used in uplink wireless communication. Uplink physical signals may not be used to transmit information output from higher layers, but are used by the physical layer.
・UL DMRS (UpLink Demodulation Reference Si)
gnal)
・SRS (Sounding Reference Signal)
・UL PTRS (UpLink Phase Tracking Reference Signal)

UL DMRS is related to PUSCH and/or PUCCH transmission. UL
DMRS is multiplexed with PUSCH or PUCCH. The base station device 3 may use UL DMRS to correct the propagation path of PUSCH or PUCCH. Hereinafter, transmitting the PUSCH and the UL DMRS related to the PUSCH together will be simply referred to as transmitting the PUSCH. Hereinafter, transmitting the PUCCH and the UL DMRS related to the PUCCH together will be simply referred to as transmitting the PUCCH. UL DMRS related to PUSCH is also referred to as UL DMRS for PUSCH. UL DMRS related to PUCCH is also referred to as UL DMRS for PUCCH.

SRS may not be related to PUSCH or PUCCH transmission. The base station device 3 may use SRS to measure channel conditions. The SRS may be transmitted at the end of a subframe in an uplink slot or in a predetermined number of OFDM symbols from the end.

The UL PTRS may be a reference signal used at least for phase tracking. A UL PTRS may be associated with a UL DMRS group that includes at least one antenna port used for one or more UL DMRSs. The association between the UL PTRS and the UL DMRS group may mean that at least some or all of the antenna ports of the UL PTRS and the antenna ports included in the UL DMRS group are QCLs. The UL DMRS group may be identified based at least on the antenna port with the lowest index among the UL DMRSs included in the UL DMRS group. The UL PTRS may be mapped to the lowest index antenna port among the antenna ports to which one codeword is mapped. The UL PTRS may be mapped to a first layer if one codeword is mapped to at least the first layer and the second layer. UL PTRS may not be mapped to the second layer. The index of the antenna port to which the UL PTRS is mapped may be given based on at least the downlink control information.

Note that uplink physical signals not described above may be used.

In FIG. 1, the following downlink physical channels are used in downlink wireless communication from the base station device 3 to the terminal device 1. The downlink physical channel is used by the physical layer to transmit information output from higher layers.
・PBCH (Physical Broadcast Channel)
・PDCCH (Physical Downlink Control Channel)
・PDSCH (Physical Downlink Shared Channel)

PBCH is a master information block (MIB).
rmation Block, BCH, Broadcast Channel). PBCH may be transmitted based on predetermined transmission intervals. PBCH may be transmitted at 80ms intervals. PBCH may be transmitted at 160ms intervals. The content of the information included in the PBCH may be updated every 80ms. Some or all of the information included in the PBCH may be updated every 160ms. PBCH may be configured with 288 subcarriers. A PBCH may be configured to include 2, 3, or 4 OFDM symbols. The MIB may include information related to the identifier (index) of the synchronization signal. The MIB may include information indicating at least part of the slot number, subframe number, and/or radio frame number in which the PBCH is transmitted.

PDCCH is used at least for transmitting downlink control information (DCI). PDCCH may be transmitted including at least downlink control information. PDCCH may include downlink control information. Downlink control information is also called DCI format. The downlink control information may include at least either a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for PDSCH scheduling is also called the downlink DCI format. The DCI format used for PUSCH scheduling is also called the uplink DCI format. A downlink grant is a downlink assignment (downlink assignment).
It is also called ignment (DL assignment) or downlink allocation (DL allocation). The uplink DCI format includes at least one or both of DCI format 0_0 and DCI format 0_1.

DCI format 0_0 is configured to include at least some or all of 1A to 1F.
1A) Identifier for DCI formats field
1B) Frequency domain resource assignment field
1C) Time domain resource allocation field
assignment field)
1D) Frequency hopping flag field
1E) MCS field: Modulation and Coding Scheme field
1F) CSI request field

The DCI format specific field may be used at least to indicate which one or more DCI formats the DCI format including the DCI format specific field corresponds to. The one or more DCI formats may be provided based on at least part or all of DCI format 1_0, DCI format 1_1, DCI format 0_0, and/or DCI format 0_1.

A frequency domain resource allocation field may be used at least to indicate frequency resource allocation for a PUSCH scheduled by a DCI format that includes the frequency domain resource allocation field. The frequency domain resource allocation field is defined by the FDRA (Frequency Domain Resource All
It is also called the location field.

A time domain resource allocation field may be used at least to indicate time resource allocation for a PUSCH scheduled by a DCI format that includes the time domain resource allocation field.

The frequency hopping flag field may be used at least to indicate whether frequency hopping is applied to a PUSCH scheduled by a DCI format that includes the frequency hopping flag field.

The MCS field may be used at least to indicate part or all of the modulation scheme and/or target coding rate for the PUSCH scheduled by the DCI format including the MCS field. The target coding rate may be a target coding rate for the transport block of the PUSCH. The size of the transport block (TBS) may be given based on at least the target coding rate.

The CSI request field is used at least to indicate the reporting of CSI. The size of the CSI request field may be a predetermined value. The size of the CSI request field may be 0, 1, 2, or 3.

DCI format 0_1 is configured to include at least some or all of 2A to 2H.
2A) DCI format specific field 2B) Frequency domain resource allocation field 2C) Time domain resource allocation field 2D) Frequency hopping flag field 2E) MCS field 2F) CSI request field
2G) BWP field
2H) UL DAI field (downlink assignment index)

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

The UL DAI field may indicate a value to which a modulo operation is applied. An example in which the UL DAI field is 2 bits will be explained. If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 0, "00" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is one, "01" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is two, “10” is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is three, "11" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is four, "00" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is five, "01" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is six, "10" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is seven, "11" is indicated as the UL DAI field. In this example, in the HARQ-ACK codebook transmitted on the PUSCH, a modulo operation using the numerical value '4' is performed on the number of PDSCHs in which the corresponding HARQ-ACK is included.

The terminal device 1 interprets the UL DAI field considering the total number of received PDSCHs. For example, the terminal device 1 receives four PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH, which is indicated by the UL DAI field, is four. For example, the terminal device 1 receives three PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH, which is indicated by the UL DAI field, is four, and It is determined that the reception was missed.

The BWP field may be used to indicate the uplink BWP to which the PUSCH scheduled according to DCI format 0_1 is mapped.

The CSI request field is used at least to indicate the reporting of CSI. The size of the CSI request field may be given based on at least the upper layer parameter ReportTriggerSize.

The downlink DCI format includes at least one or both of DCI format 1_0 and DCI format 1_1.

DCI format 1_0 is configured to include at least some or all of 3A to 3H.
3A) Identifier for DCI formats field
3B) Frequency domain resource assignment field
3C) Time domain resource allocation field
assignment field)
3D) Frequency hopping flag field
3E) MCS field (MCS field: Modulation and Coding Scheme field)
3F) First CSI request field
ld)
3G) PDSCH-to-HARQ feedback timing indicator field
3H) PUCCH resource indicator field

The timing indication field from PDSCH to HARQ feedback may be a field indicating timing K1. When the index of the slot in which the last OFDM symbol of the PDSCH is included is slot n, the index of the slot in which the PUCCH or PUSCH containing at least the HARQ-ACK corresponding to the transport block included in the PDSCH is included is n+K1; Good too. When the index of the slot in which the last OFDM symbol of the PDSCH is included is slot n, the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH that includes at least the HARQ-ACK corresponding to the transport block included in the PDSCH is The index of the included slot may be n+K1.

Hereinafter, the PDSCH-to-HARQ feedback timing indicator field (PDSCH-to-HARQ_feedback timing indicator field) may be referred to as a HARQ indication field.

The PUCCH resource indication field may be a field indicating an index of one or more PUCCH resources included in the PUCCH resource set.

DCI format 1_1 is configured to include at least some or all of 4A to 4J.
4A) Identifier for DCI formats field
4B) Frequency domain resource assignment field
4C) Time domain resource allocation field
assignment field)
4D) Frequency hopping flag field
4E) MCS field (MCS field: Modulation and Coding Scheme field)
4F) First CSI request field
ld)
4G) PDSCH-to-HARQ feedback timing indicator field
4H) PUCCH resource indicator field
4J) BWP field

The BWP field may be used to indicate the downlink BWP to which the PDSCH scheduled according to DCI format 1_1 is mapped.

The DCI format 2_0 may be configured to include at least one or more slot format indicators (SFI).

The downlink control information may include unlicensed access common information. The unlicensed access common information is control information regarding access, transmission and reception, etc. in the unlicensed frequency band. The unlicensed access common information is the subframe configuration for the downlink.
The information may also be information on Slot configuration (Unlicensed Access). The downlink subframe configuration (slot configuration) is the position of the OFDM symbol occupied in the subframe (slot) in which the PDCCH is arranged, which includes information on the downlink subframe configuration (slot configuration), and/or the downlink The position of the OFDM symbol occupied in the subframe (slot) next to the subframe (slot) in which the PDCCH including information on the subframe configuration (slot configuration) is arranged is shown. Transmission and reception of downlink physical channels and downlink physical signals are performed in occupied OFDM symbols. The unlicensed access common information may be information on the uplink subframe configuration (UL duration and offset) (slot configuration). The uplink subframe configuration (slot configuration) is based on the subframe (slot) in which the PDCCH containing information on the uplink subframe configuration (slot configuration) is arranged, and the uplink subframe (uplink slot) starts. The number of subframes (slots) in the uplink subframe (uplink slot) is shown. The terminal device 1 is not required to receive a downlink physical channel or a downlink physical signal in the subframe (slot) indicated by the uplink subframe configuration (slot configuration) information.

The downlink control information is based on the slot format index (SFI).
Indicator). A pattern indicating whether each subframe (slot) in multiple subframes (slots) is an uplink subframe (slot), a downlink subframe (slot), or a flexible subframe (slot) is It may also be transmitted and received using downlink control information. Further, the downlink control information may include information indicating the length of the COT (end of the COT). Further, the downlink control information may include information indicating outside the COT range. The terminal device 1 may determine that subframes (slots) not indicated by the received SFI are flexible subframes (slots). When PUSCH transmission is scheduled for a flexible subframe (slot) by a UL grant, the terminal device 1 processes the flexible subframe (slot) as an uplink subframe (slot). Terminal device 1
If PUSCH transmission is not scheduled for a flexible subframe (slot) by a UL grant, the mobile station monitors PDCCH candidates in the flexible subframe (slot) and performs processing to detect a DL assignment. When reception of PDSCH is scheduled by DL assignment in a flexible subframe (slot), the terminal device 1 processes the flexible subframe (slot) as a downlink subframe (slot).

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

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

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

A downlink subframe configuration may be indicated as the unlicensed access common information. The downlink subframe configuration indicates the configuration of OFDM symbols occupied in the subframe. The terminal device 1 recognizes the downlink physical channel and the OFDM symbol used for transmitting the physical signal in the base station device 3 from the OFDM symbols occupied in the subframes shown in the downlink subframe configuration. OFDM symbols occupied in the current subframe and/or the next subframe may be indicated. Here, the current subframe refers to a subframe in which unlicensed access common information including downlink subframe configuration information is received. For example, it is shown that 14 OFDM symbols are occupied in the next subframe. For example, it is shown that 10 OFDM symbols are occupied in the next subframe. For example, it is shown that 3 OFDM symbols are occupied in the next subframe. For example, it is shown that 14 OFDM symbols are occupied in the current subframe. For example, it is shown that 11 OFDM symbols are occupied in the current subframe. For example, it is shown that 6 OFDM symbols are occupied in the current subframe. For example, it is shown that 3 OFDM symbols are occupied in the current subframe.

The unlicensed access common information may be information on the uplink subframe configuration (UL duration and offset). The uplink subframe configuration includes the position of the subframe where the uplink subframe starts based on the subframe in which the PDCCH containing information on the uplink subframe configuration is arranged, and the subframe position of the uplink subframe. Show the number. The terminal device 1 is not required to receive a downlink physical channel or a downlink physical signal in the subframe indicated by the uplink subframe configuration information. For example, the first subframe from the reference subframe is shown, and the terminal device 1 receives the downlink physical channel and downlink physical signal in the first subframe from the reference subframe. is not required to receive. For example, the first subframe and six subframes from the reference subframe are shown, and the terminal device 1 displays the first subframe, second subframe, and three subframes from the reference subframe. It is not required to receive a downlink physical channel or a downlink physical signal in the second subframe, the fourth subframe, the fifth subframe, and the sixth subframe. For example, the 6th subframe and 3 subframes from the reference subframe are shown, and the terminal device 1 displays 8 subframes, the 6th subframe and the 7th subframe from the reference subframe. It is not required to receive a downlink physical channel or downlink physical signal in the second subframe.

Note that the various DCI formats may further include fields different from the above-mentioned fields. For example, a field (NFI: New Feedback Indicator field) indicating whether PDSCH HARQ-ACK information is correctly detected may be included. A field (NFI field) indicating whether to erase (flush) the HARQ-ACK bit stored in a recording medium such as a memory may be included. A field (NFI field) indicating whether to include retransmission of the transmitted HARQ-ACK codebook may be included. A field (PGI: PDSCH Group ID field) indicating a PDSCH group to which a PDSCH scheduled according to the DCI format belongs (is linked) may be included. A field (RPGI: Request PDSCH Group ID field) indicating a PDSCH group to which transmission of HARQ-ACK information is instructed may be included. A field (C-DAI: Counter Downlink Assignment Index field) indicating the cumulative number of transmitted PDCCHs may be included. A field (T-DAI: Total Downlink Assignment Index field) indicating the total number of PDCCHs to be transmitted may be included.

The terminal device 1 may be associated with a PDSCH group identifier (PGI: PDSCH Group ID) for each PDSCH. PGI of a certain PDSCH may be indicated based on at least the DCI format used for scheduling of the PDSCH. For example, a field indicating PGI (PGI field) may be included in the DCI format. For example, a PDSCH group may be a set of PDSCHs having the same PGI (PDSCH group identifier). A PDSCH group may be one PDSCH or a collection of one or more PDSCHs linked to the same PGI. The number of PDSCH groups configured for the terminal device 1 may be 1, 2, 3, 4, or any other number. It may be an integer greater than or equal to 0.

The requested PDSCH group (RPG) may be a PDSCH group corresponding to HARQ-ACK information transmitted (reported) via the next PUCCH or PUSCH. RPG (request PDSCH group) may include one PDSCH group or may include multiple PDSCH groups. The RPG indication may be indicated corresponding to each PDSCH group in the form of a bitmap based on at least the DCI format. The RPG may be indicated based on at least the RPGI field included in the DCI format. The terminal device 1 may generate a HARQ-ACK codebook for the instructed RPG and transmit (report) it via the PUCCH or PUSCH.

The value of K1 (information or parameter indicated by the timing instruction field from PDSCH to HARQ feedback) indicated by the DCI format included in PDCCH may be numerical or non-numerical. ) may be used. Here, the numerical value means a value expressed in numbers, for example, {0, 1, 2, . ．． ．． ,15
} may be the value. A non-numeric value may mean a value other than a numeric value or may mean not indicating a numeric value. The operation of numerical K1 values and non-numeric K1 values will be explained below. For example, a PDSCH scheduled according to the DCI format is transmitted by the base station device 3 in slot n and received by the terminal device 1. When the value of K1 indicated by the DCI format is a numerical value, the terminal device 1 may transmit (report) HARQ-ACK information corresponding to the PDSCH in slot n+K1 via PUCCH or PUSCH. If the value of K1 indicated by the DCI format is a non-numeric value, the terminal device 1 may postpone reporting the HARQ-ACK information corresponding to the PDSCH. If a non-numeric K1 value is indicated by the DCI format that includes PDSCH scheduling information, the terminal device 1 may postpone reporting the HARQ-ACK information corresponding to the PDSCH. For example, the terminal device 1 stores the HARQ-ACK information in a recording medium such as a memory, does not transmit (report) the HARQ-ACK information via the next PUCCH or PUSCH, and uses a format other than the above-mentioned DCI format. The transmission of the HARQ-ACK information may be triggered based at least on the DCI format to transmit (report) the HARQ-ACK information.

Non-numeric values of K1 may be included in the sequence of upper layer parameters. The upper layer parameter may be the upper layer parameter dl-DataToUL-ACK. The upper layer parameter may be a different upper layer parameter from the upper layer parameter dl-DataToUL-ACK. The value of K1 may be the value indicated by the PDSCH to HARQ feedback timing indication field included in the DCI format, among the series of upper layer parameters. For example, assuming that the sequence of upper layer parameters is set to {0, 1, 2, 3, 4, 5, 15, non-numeric value} and the number of bits in the timing indication field from PDSCH to HARQ feedback is 3. If Alternatively, the code point "111" may indicate that the value of K1 is a non-numeric value. For example, assuming that the sequence of upper layer parameters is set to {non-numeric values, 0, 1, 2, 3, 4, 5, 15} and the number of bits in the timing indication field from PDSCH to HARQ feedback is 3. If so, code point “000” in the PDSCH to HARQ feedback timing indication field may indicate that the value of K1 is a non-numeric value, and code point “001” may indicate that the value of K1 is 0. Alternatively, the code point "111" may indicate that the value of K1 is 15.

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

The terminal device 1 has one or more control resource sets (CORESET).
REsource SET) may be set. The terminal device 1 monitors PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and/or a set of PDCCH candidates. Additionally, monitoring the PDCCH may include monitoring and detecting the PDCCH and/or the DCI format transmitted over the PDCCH.

A control resource set may be a time-frequency domain to which one or more PDCCHs may be mapped. The control resource set may be an area in which the terminal device 1 monitors the PDCCH. The control resource set consists of contiguous resources (Localized resources).
ce). The control resource set may be composed of distributed resources.

In the frequency domain, the unit of mapping of the control resource set may be a resource block. For example, in the frequency domain, the unit of mapping of the control resource set may be six resource blocks. In the time domain, the unit of mapping of the control resource set may be an OFDM symbol. For example, in the time domain, the unit of mapping of control resource sets may be one OFDM symbol.

The mapping of control resource sets to resource blocks may be provided based at least on upper layer parameters. The upper layer parameters may include a bitmap for a resource block group (RBG). The group of resource blocks may be provided by six consecutive resource blocks.

The number of OFDM symbols constituting the control resource set may be given based on at least upper layer parameters. For example, the base station device 3 notifies the terminal device 1 of the starting position of the OFDM symbols that constitute the control resource set using upper layer signaling. For example, the end position of the OFDM symbols constituting the control resource set is notified from the base station device 3 to the terminal device 1 using upper layer signaling.

A certain control resource set may be a common control resource set. The common control resource set may be a control resource set that is commonly set for a plurality of terminal devices 1. The common control resource set may be provided based on at least some or all of the MIB, first system information, second system information, common RRC signaling, and cell ID. For example, the time resources and/or frequency resources of the control resource set configured to monitor the PDCCH used for scheduling the first system information may be provided based at least on the MIB.

The control resource set configured in the MIB is also called CORESET #0. CORESET #0 may be a control resource set with index #0.

A set of control resources is a set of dedicated control resources.
role resource set). The dedicated control resource set may be a control resource set configured to be used exclusively for the terminal device 1. The dedicated control resource set may be provided based on at least some or all of the dedicated RRC signaling and the value of the C-RNTI. 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 within the control resource set, and each CCE may be assigned an index (CCE index).

A CCE may be configured to include one or more groups of REGs. A group of REGs is also called a REG bundle. The number of REGs constituting one REG group is called Bundle size. For example, the REG Bundle size may be 1, 2, 3, or 6. In interleaved mapping, an interleaver may be applied on a REG bundle basis. The terminal device 1 may assume that the precoders applied to the REs within a group of REGs are the same. The terminal device 1 can perform channel estimation assuming that the precoders applied to the REs in the REG group are the same. On the other hand, the terminal device 1 may assume that precoders applied to REs between REG groups are not the same. In other words, the terminal device 1 does not have to assume that the precoders applied to REs between groups of REGs are the same. "Between REG groups" may be rephrased as "between two different REG groups." The terminal device 1 can perform channel estimation assuming that precoders applied to REs between REG groups are not the same.

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 area.

The search area consists of P at one or more aggregation levels.
It may be configured to include one or more DCCH candidates. The aggregation level of a PDCCH candidate may indicate the number of CCEs that constitute the PDCCH. A PDDCH candidate may be mapped to one or more CCEs.

The number of CCEs constituting a PDCCH candidate is determined by the aggregation level (AL).
Also called "Level". When one PDCCH candidate is composed of a plurality of CCEs, one PDCCH candidate is composed of a plurality of CCEs with consecutive CCE numbers. The set of PDCCH candidates with the aggregation level AL _x is also called a search area with the aggregation level AL _x . In _other words, the search area for aggregation level _AL
It may be configured to include DCCH candidates. Further, the search area may include PDCCH candidates at multiple aggregation levels. For example, the CSS may include PDCCH candidates at multiple aggregation levels. For example, the USS may include multiple aggregation levels of PDCCH candidates. A set of aggregation levels for PDCCH candidates included in the CSS and a set of aggregation levels for PDCCH candidates included in the USS may be defined/configured, respectively.

The terminal device 1 may monitor at least one or more search areas in slots in which DRX (Discontinuous Reception) is not set. DRX may be provided based at least on upper layer parameters. The terminal device 1 sets at least one or more search area sets in slots in which DRX is not configured.
pace set) may be monitored. A plurality of search area sets may be configured in the terminal device 1. An index (search area set index) may be assigned to each search area set.

The search area set may include at least one or more search areas. An index (search area index) may be assigned to each search area.

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

The search area may have two types: CSS (Common Search Space) and USS (UE-specific Search Space). The CSS may be a search area that is commonly set for multiple terminal devices 1. The USS may be a search area that includes settings used exclusively for individual terminal devices 1. The CSS may be provided based on at least a synchronization signal, an MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, cell ID, etc. The USS may be provided based at least on dedicated RRC signaling and/or the value of the C-RNTI. The CSS may be a search area set in a common resource (control resource element) for a plurality of terminal devices 1. The USS may be a search area set in a resource (control resource element) for each individual terminal device 1.

The CSS is a type 0 PDCCH CSS for the DCI format scrambled by SI-RNTI used for transmitting system information in the primary cell, and a type 0 PDCCH CSS for the DCI format scrambled by RA-RNTI and TC-RNTI used for initial access. Type 1 PDCCH CSS may be used. As the CSS, a PDCCH CSS of a type for DCI format scrambled by CC-RNTI used for unlicensed access may be used. The terminal device 1 can monitor PDCCH candidates in those search areas. The DCI format scrambled by a predetermined RNTI may be a DCI format to which a CRC (Cyclic Redundancy Check) scrambled by a predetermined RNTI is added.

The information related to receiving the PDCCH may include information related to an ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling CRC bits added to the PDCCH. The ID that indicates the destination of the PDCCH is also called RNTI (Radio Network Temporary Identifier). The information related to receiving the PDCCH may include information related to an ID used for scrambling CRC bits added to the PDCCH. The terminal device 1 can attempt to receive the PDCCH based at least on the information related to the ID included in the PBCH.

RNTI is SI-RNTI (System Information - RNTI), P-RNTI (Paging - RNTI), C-RNTI (Common - RNTI), Temporary C-RNTI (TC-RNTI), RA-RNTI (Rand om Access - RNTI) , CC-RNTI (Common Control - RNTI), and INT-RNTI (Interruption - RNTI). The SI-RNTI is used at least for scheduling the PDSCH that is transmitted and includes system information. The P-RNTI is used at least for scheduling the PDSCH that is transmitted and includes information such as paging information and/or system information change notification. The C-RNTI is used at least to schedule user data for the RRC-connected terminal device 1. The Temporary C-RNTI is used at least for scheduling random access messages 4. The Temporary C-RNTI is used at least to schedule a PDSCH that includes data mapped to a CCCH in a logical channel. RA-RNTI is used at least for scheduling random access messages 2. CC-RNTI is used at least for transmitting and receiving control information for unlicensed access. INT-RNTI is used at least to indicate Pre-emption on the downlink.

Note that the PDCCH and/or DCI included in the CSS does not include a CIF (Carrier Indicator Field) that indicates which serving cell (or which component carrier) the PDSCH or PUSCH is scheduled for by the PDCCH/DCI. It's okay.

Note that when carrier aggregation (CA) is configured to perform communication (transmission and/or reception) by aggregating multiple serving cells and/or multiple component carriers for the terminal device 1, a predetermined The PDCCH and/or DCI included in the USS for the serving cell (predetermined component carrier) includes a CIF indicating which serving cell and/or which component carrier the PDSCH or PUSCH is scheduled for by the PDCCH/DCI. Good too.

Note that when communicating with the terminal device 1 using one serving cell and/or one component carrier, the PDCCH and/or DCI included in the USS has information on which serving cell and/or DCI the PDCCH/DCI is. Alternatively, the CIF indicating which component carrier the PDSCH or PUSCH is scheduled for may not be included.

The common control resource set may include a CSS. The common control resource set may include both CSS and USS. The dedicated control resource set may include a USS. The dedicated control resource set may include a CSS.

The physical resources of the search area are the constituent units of the control channel (CCE).
nnelElement). A CCE is composed of a predetermined number of resource element groups (REGs). For example, a CCE may be configured with six REGs. REG may be configured by one OFDM symbol of one PRB (Physical Resource Block). In other words, REG has 12 resource elements (RE: Resource Element
). PRB is also simply called RB (Resource Block).

That is, 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 area in the control resource set.

The number of blind detections for one control resource set in one serving cell and/or one component carrier is determined based on the type of search area, the type of aggregation level, and the number of PDCCH candidates for PDCCHs included in the control resource set. may be done. Here, the type of search area may include at least one of CSS and/or USS and/or UGSS (UE Group SS) and/or GCSS (Group CSS). The type of aggregation level indicates the maximum aggregation level supported for the CCEs constituting the search area, and includes at least one of {1, 2, 4, 8, ..., X} (X is a predetermined value). It may be defined/set from scratch. The number of PDCCH candidates may indicate the number of PDCCH candidates for a certain aggregation level. That is, the number of PDCCH candidates may be defined/set for each of a plurality of aggregation levels. Note that the UGSS may be a search area commonly assigned to one or more terminal devices 1. GCSS may be a search area in which DCI including parameters related to CSS for one or more terminal devices 1 is mapped. Note that the aggregation level indicates the aggregation level of a predetermined number of CCEs, and is related to the total number of CCEs forming one PDCCH and/or search area.

Note that the size of the aggregation level may be associated with the coverage corresponding to the PDCCH and/or the search area or the size of the DCI (DCI format size, payload size) included in the PDCCH and/or the search area.

Note that when the start position (start symbol) of a PDCCH symbol is set for one control resource set, and when more than one PDCCH in the control resource set can be detected in a predetermined period, The search area type, aggregation level type, and number of PDCCH candidates for the PDCCH included in the control resource set may be set respectively for the time domain corresponding to each start symbol. The type of search area, the type of aggregation level, and the number of PDCCH candidates for PDCCHs included in the control resource set may be set for each control resource set, and may be configured based on DCI and/or upper layer signals (RRC signaling ), or may be predefined/set by a specification. Note that the number of PDCCH candidates may be the number of PDCCH candidates in a predetermined period. Note that the predetermined period may be 1 millisecond. The predetermined period may be 1 microsecond. Further, the predetermined period may be a period of one slot. Further, the predetermined period may be a period of one OFDM symbol.

Note that when there is more than one start position (start symbol) of a PDCCH symbol for one control resource set, that is, when there are multiple timings for blind detection (monitoring) of PDCCH in a predetermined period, The type of search area, type of aggregation level, and number of PDCCH candidates for PDCCHs included in the control resource set may be respectively set for the time domain corresponding to each start symbol. The search area type, aggregation level type, and number of PDCCH candidates for PDCCHs included in the control resource set may be set for each control resource set, or may be set via DCI and/or upper layer signals. It may be provided/set, or it may be predefined/set according to specifications.

Note that the number of PDCCH candidates may be indicated by a configuration in which the number to be reduced from a predetermined number of PDCCH candidates is defined/set for each aggregation level.

The terminal device 1 may transmit/notify the base station device 3 of capability information related to blind detection. The terminal device 1 may transmit/notify the number of PDCCH candidates that can be processed in one subframe to the base station device 3 as capability information regarding the PDCCH. If more control resource sets than a predetermined number can be configured for one or more serving cells/component carriers, the terminal device 1 may transmit/notify capability information related to blind detection to the base station device 3. good.

If more control resource sets than a predetermined number can be configured for a predetermined period of one or more serving cells/component carriers, the terminal device 1 transmits capability information related to blind detection to the base station device 3. You may notify.

Note that the capability information related to blind detection may include information indicating the maximum number of blind detections in a predetermined period. Further, the capability information related to the blind detection may include information indicating that PDCCH candidates can be reduced. Further, the capability information related to blind detection may include information indicating the maximum number of control resource sets that can be detected blind in a predetermined period. The maximum number of control resource sets and the maximum number of serving cells and/or component carriers that can monitor PDCCH may be set as individual parameters, or may be set as a common parameter. Further, the capability information related to blind detection may include information indicating the maximum number of control resource sets that can simultaneously perform blind detection in a predetermined period.

If the terminal device 1 does not support the ability to detect more control resource sets than a predetermined number (blind detection) in a predetermined period, it transmits/notifies capability information related to the blind detection. You don't have to. If the base station device 3 does not receive the capability information related to the blind detection, the base station device 3 may configure the control resource set so as not to exceed a predetermined number for the blind detection, and transmit the PDCCH. .

The settings related to the control resource set include a parameter indicating an index (ControlResourceSetId) that identifies the control resource set. Furthermore, the settings related to the control resource set may include a parameter indicating the frequency resource region of the control resource set (the number of resource blocks forming the control resource set). Further, the settings related to the control resource set may include a parameter indicating the type of mapping from CCE to REG. Furthermore, the settings related to the control resource set may include the REG bundle size. RRC signaling may be used to send and receive messages indicating settings regarding the control resource set. SIB may be used to send and receive messages indicating settings regarding the control resource set. MIB may be used to send and receive messages indicating settings regarding the control resource set.

The settings related to the search area include a parameter indicating an index for identifying the search area (search area index). The settings related to the search area include a parameter indicating the index of the control resource set in which the search area is placed. The settings regarding the search area may include parameters indicating the cycle and offset of the slot in which the search area is arranged. The settings related to the search area may include a parameter indicating the number of slots in which the search area is consecutively arranged. The settings related to the search area may include a parameter indicating an OFDM symbol within a slot for monitoring PDCCH candidates. The settings related to the search area may include a parameter indicating the number of PDCCH candidates to be monitored for each CCE aggregation level. The settings related to the search area may include a parameter indicating the DCI format in which monitoring is performed. The settings regarding the search area may include a parameter indicating the type of search area (CSS or USS). RRC signaling may be used to send and receive messages indicating settings regarding the search area. SIB may be used to send and receive messages indicating settings regarding the search area. MIB may be used to send and receive messages indicating settings regarding the search area.

PDSCH is used at least to transmit/receive transport blocks. PDSCH may be used at least to transmit/receive random access message 2 (random access response). The PDSCH may be used at least to transmit/receive system information including parameters used for initial access.

In FIG. 1, the following downlink physical signals are used in downlink wireless communication. Downlink physical signals may not be used to transmit information output from higher layers, but are used by the physical layer.
・Synchronization signal (SS)
・DL DMRS (DownLink DeModulation Reference
Signal)
・CSI-RS (Channel State Information-Reference Signal)
・DL PTRS (DownLink Phase Tracking Reference
eSignal)

The synchronization signal is used by the terminal device 1 to synchronize the downlink frequency domain and/or time domain. The synchronization signal is PSS (Primary Synchroniz
ation Signal), and SSS (Secondary Synchronization)
zation Signal).

The SS block (SS/PBCH block) is configured to include at least part or all of PSS, SSS, and PBCH.

DL DMRS is related to PBCH, PDCCH, and/or PDSCH transmission. DL DMRS is multiplexed onto PBCH, PDCCH, and/or PDSCH. The terminal device 1 may use DL DMRS corresponding to the PBCH, PDCCH, or PDSCH to perform channel correction of the PBCH, PDCCH, or PDSCH. The terminal device 1 may determine that the base station device 3 is transmitting a signal based on the detection of DL DMRS.

The CSI-RS may be a signal that is at least used to calculate channel state information. The CSI-RS pattern assumed by the terminal device 1 may be given by at least higher layer parameters.

The PTRS may be a signal used at least for phase noise compensation. The PTRS pattern assumed by the terminal device 1 may be given based on at least the upper layer parameters and/or the DCI.

A DL PTRS may be associated with a DL DMRS group that includes at least one antenna port used for one or more DL DMRSs.

Note that downlink physical signals not described above may be used.

A downlink physical channel and a downlink physical signal are also called a downlink signal. The uplink physical channel and the uplink physical signal are also referred to as uplink signals. Downlink signals and uplink signals are also collectively referred to as physical signals. The downlink signal and the uplink signal are also collectively referred to as signals. The downlink physical channel and the uplink physical channel are collectively referred to as a physical channel. The downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.

BCH (Broadcast Channel), UL-SCH (Uplink-Sh
DL-SCH (Downlink-Shared CHannel) and DL-SCH (Downlink-Shared CHannel) are transport channels. A channel used in a medium access control (MAC) layer is called a transport channel. The unit of transport channel used in the MAC layer is also called a transport block (TB) or MAC PDU. In the MAC layer, HARQ (Hybrid Automatic Repeat reQue
st) control is performed. A transport block is a unit of data that the MAC layer delivers to the physical layer. At the physical layer, transport blocks are mapped to codewords, and modulation processing is performed for each codeword.

The base station device 3 and the terminal device 1 exchange (transmit and receive) upper layer signals in a higher layer. For example, the base station device 3 and the terminal device 1 use RRC signaling (RRC message: Radio Resource Control message; RRC information: Radio Reso) in a radio resource control (RRC) layer. control information) may be sent and received. . In addition, the base station device 3 and the terminal device 1
may transmit and receive a MAC CE (Control Element) in the MAC layer. Here, RRC signaling and/or MAC CE are also referred to as higher layer signaling.

PUSCH and PDSCH may be used at least to transmit RRC signaling and/or MAC CE. Here, the RRC signaling transmitted from the base station device 3 on the PDSCH may be common signaling to a plurality of terminal devices 1 within the serving cell. Signaling common to multiple terminal devices 1 within a serving cell is also referred to as common RRC signaling. The RRC signaling transmitted from the base station device 3 on the PDSCH may be dedicated signaling for a certain terminal device 1 (also referred to as dedicated signaling or UE specific signaling). Signaling dedicated to the terminal device 1 is also called dedicated RRC signaling. The upper layer parameters unique to the serving cell may be transmitted/received using common signaling for a plurality of terminal devices 1 within the serving cell, or using dedicated signaling for a certain terminal device 1. The UE-specific upper layer parameters may be transmitted/received to/from a certain terminal device 1 using dedicated signaling.

BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated C
ontrol CHannel) is a logical channel. For example, BCCH is M
This is an upper layer channel used to transmit/receive IB. Further, CCCH (Common Control Channel) is an upper layer channel used for transmitting/receiving common information among a plurality of terminal devices 1. Here, the CCCH may be used, for example, for the terminal device 1 that is not connected to RRC. Further, DCCH (Dedicated Control Channel) is an upper layer channel used at least to transmit/receive dedicated control information to/from the terminal device 1 . Here, the DCCH may be used, for example, for the terminal device 1 connected by RRC.

BCCH in a logical channel may be mapped to BCH, DL-SCH, or UL-SCH in a transport channel. CCCH in a logical channel may be mapped to DL-SCH or UL-SCH in a transport channel. DCCH in a logical channel may be mapped to DL-SCH or UL-SCH in a transport channel.

UL-SCH on the transport channel may be mapped to PUSCH on the physical channel. DL-SCH on the transport channel may be mapped to PDSCH on the physical channel. BCH on the transport channel may be mapped to PBCH on the physical channel.

FIG. 5 is a diagram illustrating an example of the configuration of one REG according to one aspect of the present embodiment. A REG may be configured by one OFDM symbol of one PRB. That is, the REG may be composed of 12 consecutive REs in the frequency domain. Some of the multiple REs configuring the REG may be REs to which downlink control information is not mapped. The REG may be configured to include REs to which downlink control information is not mapped, or may be configured not to include REs to which downlink control information is not mapped. An RE to which downlink control information is not mapped may be an RE to which a reference signal is mapped, a RE to which a channel other than the control channel is mapped, or a terminal device whose control channel is not mapped may be an RE to which a reference signal is mapped, an RE to which a channel other than the control channel is mapped, It may be the RE assumed by 1.

FIG. 6 is a diagram illustrating a configuration example of a CCE according to one aspect of the present embodiment. A CCE may be configured with six REGs. As shown in FIG. 6(a), the CCE (CCE#0) may be configured by REGs that are continuously mapped (such mapping may be referred to as Localized mapping). may be referred to as non-interleaved CCE-to-REG mapping) (such mapping may be referred to as non-interleaved mapping). Note that all REGs forming a CCE do not necessarily have to be continuous in the frequency domain. For example, if all of the resource blocks that make up a control resource set are not consecutive in the frequency domain, even if the numbers assigned to the REGs are consecutive, each resource block that makes up each REG with consecutive numbers is Not continuous in the frequency domain. When a control resource set is composed of a plurality of OFDM symbols and a plurality of REGs constituting one CCE are arranged over a plurality of time intervals (OFDM symbols), as shown in FIG. 6(b), the CCE (CCE #1) may be composed of a group of consecutively mapped REGs.

As shown in FIG. 6(c), the CCE (CCE#2) may be configured by REGs that are mapped discontinuously (such mapping may be referred to as distributed mapping). (such mapping may be referred to as interleaved mapping). REGs constituting a CCE may be non-contiguously mapped to time-frequency domain resources using an interleaver. When a control resource set is composed of a plurality of OFDM symbols and a plurality of REGs constituting one CCE are arranged over a plurality of time intervals (OFDM symbols), as shown in FIG. 6(d), the CCE (CCE #3) may be configured by REGs in which REGs of different time intervals (OFDM symbols) are mixed and mapped discontinuously. As shown in FIG. 6E, the CCE (CCE #4) may be configured by REGs distributed and mapped in groups of multiple REGs. As shown in FIG. 6(f), the CCE (CCE #5) may be configured by REGs distributed and mapped in groups of multiple REGs.

FIG. 7 is a diagram illustrating an example of REGs forming a PDCCH candidate and the number of REGs forming a group of REGs according to an aspect of the present embodiment. In the example shown in FIG. 7A, a PDCCH candidate is mapped to one OFDM symbol, and three REG groups each including two REGs are configured. That is, in the example shown in FIG. 7(a), one REG group is composed of two REGs. The number of REGs constituting a group of REGs in the frequency domain may include a divisor of the number of PRBs mapped in the frequency direction. In the example shown in FIG. 7(a), the number of REGs forming the frequency domain REG group may be 1, 2, 3, or 6.

In the example shown in FIG. 7(b), PDCCH candidates are mapped to two OFDM symbols, and three REG groups each including two REGs are configured. In the example shown in FIG. 7(b), the number of REGs forming the frequency domain REG group may be either one or three.

Hereinafter, a configuration example of the terminal device 1 according to one aspect of the present embodiment will be described.

FIG. 8 is a schematic block diagram showing the configuration of the terminal device 1 according to one aspect of the present embodiment. As illustrated, the terminal device 1 includes a wireless transmitter/receiver 10 and an upper layer processor 14. The radio transmitter/receiver 10 includes at least part or all of an antenna section 11, an RF (Radio Frequency) section 12, and a baseband section 13. The upper layer processing section 14 is configured to include at least part or all of the medium access control layer processing section 15 and the radio resource control layer processing section 16. The wireless transmitter/receiver 10 is also referred to as a transmitter, a receiver, or a physical layer processor.

The physical layer processing section includes a decoding section. The receiving unit of the terminal device 1 receives the PDCCH. The decoding unit of the terminal device 1 decodes the received PDCCH. More specifically, the decoding unit of the terminal device 1 performs blind decoding processing on the received signal of the resource to which the USS PDCCH candidate corresponds. The decoding unit of the terminal device 1 performs brand decoding processing on the received signal of the resource to which the CSS PDCCH candidate corresponds. The reception processing unit of the terminal device 1 monitors PDCCH candidates within the control resource set. The reception processing unit of the terminal device 1 monitors PDCCH candidates used for PDCCHs including CC-RNTI. The reception processing unit of the terminal device 1 monitors PDCCH candidates within the control resource set. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set in the slot in which it is determined that the base station device 3 is transmitting a signal. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set in slots in which it is not determined that the base station device 3 is transmitting a signal. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set from the slot in which the base station device 3 is determined to be transmitting a signal to the slot in which transmission of HARQ-ACK is instructed. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set of slots after the slot in which transmission of HARQ-ACK is instructed. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set of the slot from the slot in which it is determined that the base station device 3 is transmitting a signal until the timer (first timer) expires. . The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set of the slot after the timer (first timer) expires.

The upper layer processing unit 14 outputs uplink data (transport blocks) generated by user operations etc. to the wireless transmitting/receiving unit 10. The upper layer processing unit 14 processes a MAC layer, a packet data convergence protocol (PDCP) layer, and a radio link control (RLC) layer.
ol) layer and RRC layer.

The medium access control layer processing unit 15 included in the upper layer processing unit 14 performs MAC layer processing.

The radio resource control layer processing section 16 included in the upper layer processing section 14 performs RRC layer processing. The radio resource control layer processing unit 16 manages various setting information/parameters of its own device. The radio resource control layer processing unit 16 sets various setting information/parameters based on the upper layer signal received from the base station device 3. That is, the radio resource control layer processing unit 16 sets various setting information/parameters based on information indicating the various setting information/parameters received from the base station device 3. Note that the configuration information may include information related to processing or configuration of a physical channel, a physical signal (that is, a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameter may be an upper layer parameter.

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 a search area within the control resource set. The radio resource control layer processing unit 16 sets PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets the number of PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets the aggregation level of the PDCCH candidates monitored within the control resource set.

The reception processing unit of the terminal device 1 uses the radio resource control layer processing unit 16 within the control resource set from the slot in which the base station device 3 is determined to be transmitting a signal to the slot in which transmission of HARQ-ACK is instructed. PDCCH candidates are monitored in the search area set by. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the search area set by the radio resource control layer processing unit 16 within the control resource set of the slot after the slot in which HARQ-ACK transmission is instructed. The reception processing unit of the terminal device 1 performs radio resource control layer processing within the control resource set of the slot from the slot in which it is determined that the base station device 3 is transmitting a signal until the timer (first timer) expires. PDCCH candidates are monitored in the search area set by the unit 16. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the search area set by the radio resource control layer processing unit 16 within the control resource set of the slot after the timer (first timer) expires. Note that the radio resource control layer processing unit 16 may set the search area not based on the RRC signaling received from the base station device 3 but based on a predetermined rule. For example, the radio resource control layer processing unit 16 searches a predetermined search area (PDCCH candidates at a predetermined aggregation level, PDCCH candidates at a predetermined aggregation level, (number of PDCCH candidates) may be set.

The wireless transmitter/receiver 10 performs physical layer processing such as modulation, demodulation, encoding, and decoding. The wireless transmitting/receiving unit 10 separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper layer processing unit 14. The wireless transmitter/receiver 10 modulates, encodes, and generates a baseband signal (converts to a time continuous signal) to generate a physical signal, and transmits the physical signal to the base station device 3 .

The RF section 12 converts the signal received via the antenna section 11 into a baseband signal by orthogonal demodulation (down convert), and removes unnecessary frequency components. The RF section 12 outputs the processed analog signal to the baseband section.

The baseband section 13 converts the analog signal input from the RF section 12 into a digital signal. The baseband section 13 converts the converted digital signal into CP (Cyclic Pr).
A fast Fourier transform (FFT) is performed on the signal from which the CP has been removed, and a signal in the frequency domain is extracted.

The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the data.
ast Fourier Transform) to generate an OFDM symbol, add a CP to the generated OFDM symbol, generate a baseband digital signal, and convert the baseband digital signal into an analog signal. The baseband section 13 outputs the converted analog signal to the RF section 12.

The RF unit 12 removes extra frequency components from the analog signal input from the baseband unit 13 using a low-pass filter, up-converts the analog signal to a carrier frequency, and transmits it via the antenna unit 11. do. Furthermore, the RF section 12 amplifies power. Further, the RF section 12 may have a function of controlling transmission power. The RF section 12 is also referred to as a transmission power control section.

Terminal device 1 receives PDCCH. The radio resource control layer processing unit 16 sets a control resource set. The radio resource control layer processing unit 16 sets a search area. The radio resource control layer processing unit 16 sets a control resource set based on RRC signaling. The radio resource control layer processing unit 16 sets a search area based on RRC signaling. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates within the search area of the configured control resource set. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates within a search area of a control resource set set in a certain slot. The decoding unit of the terminal device 1 decodes the monitored PDCCH candidates. The radio resource control layer processing unit 16 sets a search area within the control resource set from the slot in which the base station device 3 is determined to be transmitting a signal to the slot in which transmission of HARQ-ACK is instructed. The radio resource control layer processing unit 16 sets a search area within the control resource set for slots after the slot in which HARQ-ACK transmission is instructed. The radio resource control layer processing unit 16 sets a search area within the control resource set for the slot from the slot in which it is determined that the base station device 3 is transmitting a signal until the timer (first timer) expires. . The radio resource control layer processing unit 16 sets a search area within the control resource set of the slot after the timer (first timer) expires.

The receiving unit of the terminal device 1 monitors the number of PDCCH candidates set based on RRC signaling within the search area of the control resource set in a certain slot. The receiving unit of the terminal device 1 monitors PDCCH candidates configured from one or more OFDM symbols configured based on RRC signaling within a search area of a control resource set in a certain slot. The receiving unit of the terminal device 1 searches for a search area in the first half of the slot (for example, the first OFDM symbol, the first and second OFDM symbols, or the first, second, and third OFDM symbols) in a certain slot. A first number of PDCCH candidates are monitored. The receiving unit of the terminal device 1 searches for a search area in the first half of the slot (for example, the first OFDM symbol, the first and second OFDM symbols, or the first, second, and third OFDM symbols) in a certain slot. monitor a second number of PDCCH candidates and search for the second half of the slot (e.g., the 8th OFDM symbol, or the 8th and 9th OFDM symbols, or the 8th, 9th, and 10th OFDM symbols); A third number of PDCCH candidates are monitored in the region. Here, the first number is greater than the second number. Here, the first number is greater than the third number. The second number and the third number may be the same or different. Note that the receiving unit of the terminal device 1 may set three or more search areas, each of which is a search area for a different OFDM symbol in a certain slot, and further monitor PDCCH candidates distributed within the slot. good.

Hereinafter, a configuration example of the base station device 3 according to one aspect of the present embodiment will be described.

FIG. 5 is a schematic block diagram showing the configuration of the base station device 3 according to one aspect of the present embodiment. As illustrated, the base station device 3 includes a wireless transmitter/receiver 30 and an upper layer processor 34. The radio transmitting/receiving section 30 includes an antenna section 31, an RF section 32, and a baseband section 33. The upper layer processing section 34 includes a medium access control layer processing section 35 and a radio resource control layer processing section 36. The wireless transmitting/receiving unit 30 is also referred to as a transmitting unit, a receiving unit, or a physical layer processing unit.

The upper layer processing unit 34 processes the MAC layer, PDCP layer, RLC layer, and RRC layer.

The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing.

The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs RRC layer processing. The radio resource control layer processing unit 36 generates downlink data (transport blocks), system information, RRC messages, MAC CE, etc. placed on the PDSCH, or acquires them from upper nodes, and outputs them to the radio transceiver 30. . Further, the radio resource control layer processing unit 36 manages various setting information/parameters of each terminal device 1. The radio resource control layer processing unit 36 may set various setting information/parameters for each terminal device 1 via upper layer signals. That is, the radio resource control layer processing unit 36 transmits/broadcasts information indicating various setting information/parameters. Note that the configuration information may include information related to processing or configuration of a physical channel, a physical signal (that is, a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameter may be an upper layer parameter.

The radio resource control layer processing unit 36 sets a control resource set for the terminal device 1. A plurality of PDCCH candidates are configured (set) within the configured control resource set. The radio resource control layer processing unit 36 sets a search area for the terminal device 1. The radio resource control layer processing unit 36 sets, for the terminal device 1, a search area within the control resource set from the slot after starting signal transmission to the slot in which HARQ-ACK transmission is instructed. The radio resource control layer processing unit 36 sets, for the terminal device 1, a search area in the control resource set for slots after the slot in which HARQ-ACK transmission is instructed.

The functions of the wireless transmitter/receiver 30 are the same as those of the wireless transmitter/receiver 10, so the description thereof will be omitted. Furthermore, the wireless transmitting/receiving unit 30 grasps the SS (Search space) configured in the terminal device 1 . The wireless transmitting/receiving unit 30 grasps the search area within the control resource set configured in the terminal device 1. The wireless transmitting/receiving unit 30 understands the PDCCH candidates monitored by the terminal device 1 and knows the search area. The radio transmitting/receiving unit 30 determines which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (ascertains the number of the control channel element in which the PDCCH candidate is constructed). The wireless transmitting/receiving unit 30 includes an SS understanding unit, and the SS understanding unit knows the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates within the control resource set configured as a search space of the terminal device. The SS grasping unit grasps PDCCH candidates (the number of PDCCH candidates, the number of PDCCH candidates) configured in the search area of the control resource set of the terminal device 1.

The SS grasping unit determines the configuration of the search area (number of PDCCH candidates, PDCCH candidates, The OFDM symbols and aggregation levels of PDCCH candidates are ascertained. The SS grasping unit grasps the configuration of the search area within the control resource set from the slot following the slot in which signal transmission is first started to the slot in which HARQ-ACK transmission is instructed. The SS grasping unit grasps the configuration of the search area in the control resource set of the slot after the slot in which HARQ-ACK transmission is instructed. The transmitter of the wireless transmitter/receiver 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidates within the search area of the control resource set.

The SS grasping unit determines that the first number of PDCCH candidates are the first half of the slot (for example, the first OFDM symbol, the first and second OFDM symbols, or the first and second OFDM symbols) as the configuration of the search area of a certain slot. It is understood that it is composed of the OFDM symbols (the 1st and 3rd OFDM symbols). The SS grasping unit determines that the second number of PDCCH candidates are the first half of the slot (for example, the first OFDM symbol, the first and second OFDM symbols, or the first and second OFDM symbols) as the configuration of the search area of a certain slot. and a third number of PDCCH candidates in the second half of the slot (e.g., the 8th OFDM symbol, or the 8th and 9th OFDM symbol, or the 8th and 9th OFDM symbol). 9th and 10th OFDM symbols). Here, the first number is greater than the second number. Here, the first number is greater than the third number. The second number and the third number may be the same or different. Note that the SS grasping unit may grasp that three or more search regions are formed in a certain slot, each of which is a search region of a different OFDM symbol.

Each of the units labeled 10 to 16 included in the terminal device 1 may be configured as a circuit. Each of the units 30 to 36 included in the base station device 3 may be configured as a circuit.

Prior to transmitting the physical signal, the terminal device 1 performs carrier sense
) may be implemented. Furthermore, the base station device 3 may perform carrier sense prior to transmitting the physical signal. Carrier sensing may be performing energy detection on a radio channel. Whether or not the physical signal can be transmitted may be determined based on carrier sense that is performed prior to transmitting the physical signal. For example, if the amount of energy detected by carrier sensing performed prior to the transmission of a physical signal is greater than a predetermined threshold, the physical channel may not be transmitted or cannot be transmitted. It may be determined that Furthermore, if the amount of energy detected by carrier sensing performed prior to transmitting a physical signal is smaller than a predetermined threshold, transmission of the physical channel may be performed or transmission is possible. You may be judged. Further, when the amount of energy detected by carrier sensing performed prior to transmission of a physical signal is equal to a predetermined threshold, transmission of the physical channel may or may not be performed. . In other words, if the amount of energy detected by carrier sensing performed prior to physical signal transmission is equal to a predetermined threshold, it may be determined that transmission is not possible, or it may be determined that transmission is possible. good.

The procedure for determining whether or not a physical channel can be transmitted based on carrier sense is also called LBT (Listen Before Talk). A situation in which it is determined that transmission of a physical signal is not possible as a result of LBT is also called a busy state or busy. For example, the busy state may be a state in which the amount of energy detected by carrier sensing is greater than a predetermined threshold. Further, a situation in which it is determined that transmission of a physical signal is possible as a result of LBT is also called an idle state or idle. For example, the idle state may be a state in which the amount of energy detected by carrier sensing is less than a predetermined threshold. A determination that transmission of a physical signal is not possible as a result of LBT is also referred to as LBT failure.

The period during which a channel is continuously occupied (Channel Occupancy Time: COT) may be predetermined by country, or may be predetermined for each frequency band. The base station device 3 may notify the terminal device 1 of the channel occupied section. If the terminal device 1 can appropriately detect the notification from the base station device 3, it can recognize the length of the channel occupied period and grasp the timing at which the channel occupied period ends. For example, the maximum value of COT may be 2ms, 3ms, 6ms, 8ms, or 10ms. If the terminal device 1 cannot explicitly detect the notification from the base station device 3, it detects the transmission signal from the base station device 3, and determines that the base station device 3 has started occupying the channel. The end of the channel occupied period can be estimated based on a timer (first timer) or the like.

The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto the PUCCH and transmit it. The terminal device 1 may multiplex the UCI onto the PUSCH and transmit it. UCI is the downlink channel state information (Channel
State Information: CSI), Scheduling Request (SR) indicating a request for PUSCH resources, downlink data (Transport block, Medium Access Control Protocol Data U) nit: MAC PDU, Downlink-Shared
Channel: HARQ-ACK (Hybrid Automatic
ic Repeat request ACKnowledgement).

HARQ-ACK, ACK/NACK, HARQ feedback, HARQ-ACK
It may also be called feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

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

HARQ control for one transport block may be called a HARQ process. One HARQ process identifier may be provided for each HARQ process. The DCI format includes a field indicating a HARQ process identifier.

NDI (New Data Indicator) is indicated in DCI format for each HARQ process. For example, the NDI field is included in the DCI format (DL assignment) that includes PDSCH scheduling information. The NDI field is 1 bit. The terminal device 1 stores (memorizes) the value of NDI for each HARQ process. The base station device 3 stores (memorizes) the NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format. The base station device 3 sets the updated NDI value or the non-updated NDI value in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 uses the NDI field of the detected DCI format to update the stored NDI value for the HARQ process that corresponds to the value of the HARQ process identifier field of the detected DCI format.

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

The terminal device 1 stores HARQ-ACK information in a HARQ-ACK codebook (HARQ-ACK codebook) in a slot designated by the value of the HARQ instruction field included in DCI format 1_0 or DCI format 1_1 that corresponds to PDSCH reception. ) may be used to report to the base station device 3.

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

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

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

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

An example of the setting of the HARQ indication field will be described. For example, dl-DataToUL-ACK is composed of a list of eight timings, 0, 7, 15, 23, 31, 39, 47, and 55, and the HARQ indication field is composed of three bits. The HARQ indication field of "000" corresponds to the first 0 in the list of dl-DataToUL-ACK as the corresponding timing. In other words, the HARQ indication field of "000" corresponds to the dl-D
The HARQ indication field corresponds to the value 0 indicated by the index 1 of the dl-DataToUL-ACK. The HARQ indication field of "001" corresponds to the second 7 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field of "010" corresponds to the third 15 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field of "011" corresponds to the fourth 23 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field of "100" corresponds to the fifth 31 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field of "101" corresponds to the sixth 39 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field "110" corresponds to the seventh 47 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field "111" corresponds to the eighth 55 in the list of dl-DataToUL-ACK as the corresponding timing. When the received HARQ indication field indicates "000", the terminal device 1 transmits the corresponding HARQ-ACK in the 0th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "001", the terminal device 1 transmits the corresponding HARQ-ACK in the 7th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "010", the terminal device 1 transmits the corresponding HARQ-ACK in the 15th slot from the slot of the received PDSCH. If the received HARQ indication field indicates "011", the terminal device 1 transmits the corresponding HARQ-ACK in the 23rd slot from the slot of the received PDSCH. If the received HARQ indication field indicates "100", the terminal device 1 transmits the corresponding HARQ-ACK in the 31st slot from the slot of the received PDSCH. If the received HARQ indication field indicates "101", the terminal device 1 transmits the corresponding HARQ-ACK in the 39th slot from the slot of the received PDSCH. If the received HARQ indication field indicates "110", the terminal device 1 transmits the corresponding HARQ-ACK in the 47th slot from the slot of the received PDSCH. If the received HARQ indication field indicates "111", the terminal device 1 transmits the corresponding HARQ-ACK in the 55th slot from the slot of the received PDSCH.

When the upper layer parameter pdsch-AggregationFactor is given to the terminal device 1, N _PDSCH ^repeat may be the value of pdsch-AggregationFactor. When the upper layer parameter pdsch-AggregationFactor is not given to the terminal device 1, N _PDSCH ^repeat may be 1. The terminal device 1 may report HARQ-ACK information for PDSCH reception from slot n-N _PDSCH ^repeat +1 to slot n using PUCCH transmission in slot n+k and/or PUSCH transmission. Here, k may be the number of slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception. Also, when the HARQ indication field is not included in the DCI format, k may be given by the upper layer parameter dl-DataToUL-ACK.

When the terminal device 1 is configured to monitor a PDCCH including DCI format 1_0 and not to monitor a PDCCH including DCI format 1_1, the HARQ-ACK timing value K1 is (1, 2, 3, 4, 5, 6, 7, and 8). If the terminal device 1 is configured to monitor a PDCCH including DCI format 1_1, the HARQ-ACK timing value K1 may be given by the upper layer parameter dl-DataToUL-ACK.

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

The HARQ indication field included in the DCI format received on the PDCCH of slot n-1 indicates 1. The HARQ indication field included in the DCI format received on the PDCCH of slot n-2 indicates 2. The HARQ indication field included in the DCI format received on the PDCCH of slot n-3 indicates 3. The HARQ indication field included in the DCI format received on the PDCCH of slot n-4 indicates 4. The HARQ indication field included in the DCI format received on the PDCCH of slot n-5 indicates 5. The HARQ indication field included in the DCI format received on the PDCCH of slot n-6 indicates 6. The HARQ indication field included in the DCI format received on the PDCCH of slot n-7 indicates 7. The HARQ indication field included in the DCI format received on the PDCCH of slot n-8 indicates 8.

Based on the slot in which the PDCCH was received and the value of the HARQ instruction field included in the received DCI format, the terminal device 1 determines the slot in which to transmit HARQ-ACK information and the number of candidate PDSCH receptions corresponding to the HARQ-ACK information. Determine the set of slots. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), terminal device 1 receives PDCCH in slot m, and the HARQ instruction field included in DCI format is 4. Let us show Terminal device 1 determines to transmit HARQ-ACK information in slot (m+4). The terminal device 1 determines that the other HARQ-ACK information transmitted in slot (m+4) is the HARQ-ACK information for PDSCH reception in slot (m+(1-4)) and the HARQ-ACK information in slot (m+(2-4)). HARQ-ACK information for PDSCH reception, HARQ-ACK information for PDSCH reception in slot (m+(3-4)), HARQ-ACK information for PDSCH reception in slot (m+(5-4)), and HARQ-ACK information for PDSCH reception in slot (m+(5-4)), (6-4)) HARQ-ACK information for PDSCH reception in slot (m+(7-4)), HARQ-ACK information for PDSCH reception in slot (m+(8-4)), and HARQ-ACK information for PDSCH reception in slot (m+(8-4)). ACK information.

dl-DataToUL-ACK may include not only a value indicating the number of slots as the timing of HARQ-ACK, but also a value (information) indicating that HARQ-ACK is held. When the terminal device 1 receives a HARQ instruction field indicating a value indicating that HARQ-ACK is to be held on the PDCCH, the terminal device 1 holds the HARQ-ACK (HARQ-ACK information) for the PDSCH scheduled on that PDCCH, and Waits for transmission of ACK (HARQ-ACK information).

In the above, the Semi-static HARQ-ACK codebook was explained as a type of HARQ-ACK codebook, but different types of HAR
A Q-ACK codebook may be used. Dynamic HARQ-ACK
A type of HARQ-ACK codebook called "codebook" will be explained.

A HARQ-ACK codebook corresponding to a certain PDSCH group includes one or more HARQ-ACK codebooks corresponding to one or more transport blocks included in one or more PDSCHs included in the certain PDSCH group. Given based on the ACK bit. The HARQ-ACK codebook is based on monitoring opportunities for PDCCH.
occasion for PDCCH) based on at least some or all of the values of the counter DAI field. The HARQ-ACK codebook may be provided further based on the value of the UL DAI field. , the HARQ-ACK codebook may be provided further based on the value of the DAI field. The HARQ-ACK codebook may be provided further based on the value of the total DAI field.

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

The terminal device 1 sets a set of PDCCH monitoring opportunities for HARQ-ACK information transmitted on the PUCCH arranged in the slot with index n (slot#n), the value of timing K1, and the value of slot offset K0. The decision may be made based on at least some or all of the following. The set of PDCCH monitoring occasions for HARQ-ACK information transmitted on the PUCCH located in the slot with index n is also referred to as the set of monitoring occasions for PDCCH for slot#n. It is called. Here, the set of PDCCH monitoring opportunities includes M PDCCH monitoring opportunities. For example, the slot offset K0 may be indicated based at least on the value of a time domain resource allocation field included in the downlink DCI format. The slot offset K0 is from the slot containing the last OFDM symbol in which the PDCCH including the DCI format including the time domain resource allocation field indicating the slot offset K0 is arranged to the first OFDM symbol of the PDSCH scheduled according to the DCI format. This value indicates the number of slots (slot difference).

If the DCI format detected in the monitoring opportunity of any search area set corresponding to the monitoring opportunity of a certain PDCCH triggers (includes triggering information) to transmit HARQ-ACK information in slot n, the terminal device 1 may determine the PDCCH monitoring opportunity as the PDCCH monitoring opportunity for slot n. Furthermore, if the DCI format detected in the monitoring opportunity of the search area set corresponding to the monitoring opportunity of a certain PDCCH does not trigger (does not include triggering information) the transmission of HARQ-ACK information in slot n, the terminal device 1 may not determine the PDCCH monitoring opportunity as the PDCCH monitoring opportunity for slot n. Furthermore, if the DCI format is not detected in the monitoring opportunity of the search area set corresponding to a certain PDCCH monitoring opportunity, the terminal device 1 does not have to determine the PDCCH monitoring opportunity as the PDCCH monitoring opportunity for slot n. .

The PUCCH resource used for transmitting HARQ-ACK information in slot n is the PUCCH resource included in the last DCI format among one or more DCI formats detected in the set of PDCCH monitoring opportunities for slot n. The identification may be based at least on an instruction field. Here, each of the one or more DCI formats triggers the transmission of HARQ-ACK information in slot n. The last DCI format may be the DCI format corresponding to the last index (largest index) of the DCI formats detected in the set of PDCCH monitoring opportunities for the slot n. The index of the DCI format in the set of PDCCH monitoring opportunities for the slot n is given in ascending order with respect to the index of the serving cell where the DCI format is detected, and then the PDCCH monitoring opportunity set where the DCI format is detected. given in ascending order of index. PDCCH monitoring opportunity indices are given in ascending order on the time axis.

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

Semi-static HARQ-ACK codebook (Type 1 HARQ-ACK codebook) or Dynamic HARQ-ACK codebook (Type 2 HARQ-ACK codebook) is instructed to transmit (triggered) based on DL assignment. , requested) HARQ- ACK codebook (second HARQ-ACK codebook). The DCI format including the HARQ indication field is DL assignment (Downlink assignment). DL assignment is the DCI format used for PDSCH scheduling. DL assignment is the DCI format used for PDSCH assignment. The Semi-static HARQ-ACK codebook is configured based on dl-DataToUL-ACK and the HARQ indication field. The size of the Semi-static HARQ-ACK codebook is based on the size included in dl-DataToUL-ACK. The timing of the slots included in the Semi-static HARQ-ACK codebook or the Dynamic HARQ-ACK codebook is based on the value of the HARQ indication field and the slot in which the DCI containing the HARQ indication field was received.

Transmission of a certain HARQ-ACK codebook (first HARQ-ACK codebook) (type 3 HARQ-ACK codebook) is instructed (triggered, requested) by a DCI format that is not a DL assignment. For example, the DCI format that is not a DL assignment is a DCI format that is used only to trigger the transmission of the first HARQ-ACK codebook. For example, the DCI format that is not a DL assignment is a DCI format (UL grant) that performs PUSCH scheduling.

The first HARQ-ACK codebook includes HARQ-ACK information for multiple or all HARQ processes. For example, HARQ process means HARQ process used for PDSCH. For example, all HARQ processes refer to all HARQ processes that can be used in at least one serving cell. For example, the number of HARQ processes that can be used in one serving cell is 16. For example, the number of HARQ processes that can be used by five serving cells is 80. For example, a plurality of HARQ processes means a plurality of HARQ processes configured by RRC signaling. For example, a plurality of HARQ processes means a plurality of HARQ processes instructed by Downlink control information. For example, a plurality of HARQ processes means a plurality of explicitly or implicitly indicated HARQ processes. For example, the number of multiple HARQ processes is eight. For example, the number of multiple HARQ processes is ten.

The second HARQ-ACK codebook can be said to be a HARQ-ACK codebook whose transmission is triggered by the DCI format (DL assignment) with PDSCH scheduling information. The first HARQ-ACK codebook is a HARQ-ACK codebook whose transmission is triggered by a different type of DCI format (DCI format only for instructing transmission of the HARQ-ACK codebook) than the DCI format accompanied by PDSCH scheduling information. I can say that.

The second HARQ-ACK codebook can be said to be a HARQ-ACK codebook in which the relationship between the slot in which the HARQ-ACK codebook is transmitted and received and the PDSCH slot to which the HARQ-ACK included in the HARQ-ACK codebook corresponds is defined. The HARQ process used for the PDSCH to which the HARQ-ACK included in the second HARQ-ACK codebook corresponds is not limited in advance and is set by the scheduling of the base station device 3. The first HARQ-ACK codebook can be said to be a HARQ-ACK codebook in which the HARQ process of the PDSCH to which the HARQ-ACK included in the HARQ-ACK codebook corresponds is defined. The slot in which the PDSCH corresponding to the HARQ-ACK included in the first HARQ-ACK codebook is received is not limited in advance and is set by the scheduling of the base station device 3.

The DCI format that triggers the transmission of the first HARQ-ACK codebook may include an NDI field. The DCI format that triggers the transmission of the first HARQ-ACK codebook may include an NDI field for each HARQ process in which the HARQ-ACK is included in the first HARQ-ACK codebook. The base station device 3 may set the latest NDI value stored for each HARQ process in the NDI field of the DCI format. The terminal device 1 may determine which HARQ-ACKs to include in the first HARQ-ACK codebook based on the NDI field included in the DCI format that triggers transmission of the first HARQ-ACK codebook (even if configured). good). The HARQ-ACK may be a HARQ-ACK corresponding to a transport block for a certain HARQ process. The NDI field may indicate the NDI for the certain HARQ process. Specifically, if the NDI value stored for each HARQ process is the same as the NDI value indicated by the DCI format that triggers the transmission of the first HARQ-ACK codebook, the terminal device 1 performs the corresponding The information of the HARQ-ACK memorized (stored) for the HARQ process is included in the first HARQ-ACK codebook, and the NDI value stored for each HARQ process and the first HARQ-ACK are included. A NACK may be included in the first HARQ-ACK codebook for the corresponding HARQ process if the value of NDI indicated by the DCI format that triggers the transmission of the codebook is different.

The second HARQ-ACK codebook may be transmitted and received on PUSCH. In a state where the base station device 3 triggers the transmission of HARQ-ACK information in the DCI format including PDSCH scheduling information to the terminal device 1, the base station device 3 transmits the DCI format (UL grant) including PUSCH scheduling information to the terminal device. 1 and causes the terminal device 1 to transmit the second HARQ-ACK codebook on the PUSCH. When the terminal device 1 receives the DCI format (UL grant) including the PUSCH scheduling information in a state where the transmission of HARQ-ACK information is triggered in the DCI format including the PDSCH scheduling information, the terminal device 1 transmits the second HARQ-ACK information on the PUSCH. Send HARQ-ACK codebook.

When a Dynamic HARQ-ACK codebook (type 2 HARQ-ACK codebook) is used as the second HARQ-ACK codebook, a UL DAI field is included in the UL grant. The UL grant may include a UL DAI field for each PDSCH group. The number of PDSCH groups to be used may be configured from the base station device 3 to the terminal device 1 using RRC signaling. The base station device 3 transmits the UL data including the UL DAI field for each PDSCH group.
grant to the terminal device 1, and receives PUSCH including HARQ-ACK information for each PDSCH group. The terminal device 1 receives a UL grant including a UL DAI field for each PDSCH group from the base station device 3, and transmits a PUSCH including HARQ-ACK information for each PDSCH group. Terminal device 1 uses UL for each PDSCH group.
A UL grant including a DAI field is received from the base station device 3, and a PUSCH including HARQ-ACK information of all PDSCH groups configured in advance is transmitted.

For example, if there are two PDSCH groups, PDSCH group 1 and PDSCH group 2, a UL DAI field for PDSCH group 1 and a UL DAI field for PDSCH group 2 are included in the UL grant. The terminal device 1 determines HARQ-ACK information for PDSCH group 1 using the UL DAI field for PDSCH group 1, and determines HARQ-ACK information for PDSCH group 2 using the UL DAI field for PDSCH group 2. The UL DAI field indicates the number of PDSCHs in which the HARQ-ACK corresponding to the HARQ-ACK codebook transmitted on the PUSCH is included. If the number of PDSCHs received is smaller than the number of PDSCHs indicated by the UL DAI field, the terminal device 1 determines that there is a PDCCH that has missed detection, and sets a bit indicating NACK in the corresponding HARQ-ACK bit. . The terminal device 1 transmits HARQ-ACK information for PDSCH group 1 and HARQ-ACK information for PDSCH group 2 on the PUSCH. The base station device 3 determines whether a PDCCH detection error in PDSCH group 1 has occurred in the terminal device 1 based on the HARQ-ACK information for PDSCH group 1 received on PUSCH, and performs HARQ-ACK for PDSCH group 2 received on PUSCH. Based on the ACK information, it is determined whether a PDCCH detection error in PDSCH group 2 has occurred in the terminal device 1. In this way, by including the UL DAI field for each PDSCH group in the UL grant, the terminal device 1 can determine a PDCCH detection error for each PDSCH group, and the base station device 3 can appropriately use the determination result at the terminal device 1. can be recognized.

The UL grant may include one UL DAI field for all PDSCH groups. The base station device 3 transmits a UL grant including UL DAI fields for all PDSCH groups to the terminal device 1, and receives a PUSCH including HARQ-ACK information for all PDSCH groups. The terminal device 1 receives a UL grant including UL DAI fields for all PDSCH groups from the base station device 3, and transmits a PUSCH including HARQ-ACK information for all PDSCH groups. The UL DAI field for all PDSCH groups may indicate the size of the HARQ-ACK codebook containing HARQ-ACK information of all PDSCH groups. The UL DAI field for all PDSCH groups may indicate the number of HARQ-ACKs for all PDSCH groups to be included in the HARQ-ACK codebook transmitted on the PUSCH. The UL DAI field for all PDSCH groups may indicate the number of PDSCHs of all PDSCH groups for which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH.

For example, if there are two PDSCH groups, PDSCH group 1 and PDSCH group 2, the UL grant includes a UL DAI field for the PDSCH group that is the combination of PDSCH group 1 and PDSCH group 2. The terminal device 1 determines HARQ-ACK information for PDSCH group 1 and PDSCH group 2 using the UL DAI field. The UL DAI field indicates the number of PDSCHs of all PDSCH groups in which the HARQ-ACK corresponding to the HARQ-ACK codebook transmitted on the PUSCH is included. If the number of received PDSCHs is smaller than the number of PDSCHs indicated by the UL DAI field, the terminal device 1 determines that there is a PDCCH that has missed detection, and sets a bit indicating NACK in the corresponding HARQ-ACK bit. . Terminal device 1 transmits HARQ-ACK information for PDSCH group 1 and PDSCH group 2 on PUSCH.

FIG. 10 is a diagram showing an example of a search area (first search area) set in the terminal device 1 according to one aspect of the present embodiment. In FIG. 10, 14 OFDM symbols (l=0, l=1, l=2, l=3, l=4, l=5, l=6, l=7, l=8, l =9, l=10, l=11, l=12, l=13). In FIG. 10, the 1st (l=0) to 7th (l=6) OFDM symbols are the OFDM symbols in the first half of the slot, and the 8th (l=7) to 14th (l=13) OFDM symbols are the OFDM symbols in the first half of the slot. The symbol is an OFDM symbol in the first half of the slot. In FIG. 10, the first search area is set to the first (l=0) OFDM symbol of the slot.

FIG. 11 is a diagram showing an example of a search area (second search area) set in the terminal device 1 according to one aspect of the present embodiment. In FIG. 11, 14 OFDM symbols (l=0, l=1, l=2, l=3, l=4, l=5, l=6, l=7, l=8, l =9, l=10, l=11, l=12, l=13). In FIG. 11, the 1st (l=0) to 7th (l=6) OFDM symbols are the OFDM symbols in the first half of the slot, and the 8th (l=7) to 14th (l=13) OFDM symbols are the OFDM symbols in the first half of the slot. The symbol is an OFDM symbol in the first half of the slot. In FIG. 11, the second search area is set to the first (l=0) OFDM symbol of the slot and the eighth (l=7) OFDM symbol of the slot. In this case, one PDCCH candidate consists of one or more CCEs of the first (l=0) OFDM symbol of the slot or one or more CCEs of the eighth (l=7) OFDM symbol of the slot. . Note that the search area set for the first (l=0) OFDM symbol of the slot and the search area set for the eighth (l=7) OFDM symbol of the slot are logically different search areas. Good too. FIG. 11 shows a search area set consisting of a search area set to the first (l=0) OFDM symbol of the slot and a search area set to the eighth (l=7) OFDM symbol of the slot. It's okay.

FIG. 12 is a diagram showing an example of a search area (third search area) set in the terminal device 1 according to one aspect of the present embodiment. In FIG. 12, 14 OFDM symbols (l=0, l=1, l=2, l=3, l=4, l=5, l=6, l=7, l=8, l =9, l=10, l=11, l=12, l=13). In FIG. 12, the 1st (l=0) to 7th (l=6) OFDM symbols are the OFDM symbols in the first half of the slot, and the 8th (l=7) to 14th (l=13) OFDM symbols are the OFDM symbols in the first half of the slot. The symbol is an OFDM symbol in the first half of the slot. In FIG. 12, the third search area is set to the first (l=0) to second (l=1) OFDM symbols of the slot. In this case, one PDCCH candidate is composed of one or more CCEs of the first (l=0) and second (l=1) OFDM symbols of the slot.

FIG. 13 is a diagram showing an example of a search area (fourth search area) set in the terminal device 1 according to one aspect of the present embodiment. In FIG. 13, 14 OFDM symbols (l=0, l=1, l=2, l=3, l=4, l=5, l=6, l=7, l=8, l =9, l=10, l=11, l=12, l=13). In FIG. 13, the 1st (l=0) to 7th (l=6) OFDM symbols are the OFDM symbols in the first half of the slot, and the 8th (l=7) to 14th (l=13) OFDM symbols are the OFDM symbols in the first half of the slot. The symbol is an OFDM symbol in the first half of the slot. In FIG. 13, the fourth search area includes the first (l=0) OFDM symbol of the slot, the fourth (l=3) OFDM symbol of the slot, and the eighth (l=7) OFDM symbol of the slot. is set in the 12th (l=11) OFDM symbol of the slot. In this case, one PDCCH candidate is one or more CCEs of the first (l=0) OFDM symbol of the slot, or one or more CCEs of the fourth (l=3) OFDM symbol of the slot, or one or more CCEs of the fourth (l=3) OFDM symbol of the slot. It consists of one or more CCEs of the 8th (l=7) OFDM symbol or one or more CCEs of the 12th (l=11) OFDM symbol of the slot.

Figure 14 is a diagram showing an example of a determination regarding the setting of a search area according to one aspect of this embodiment. The state until it is determined that the base station device 3 is transmitting a signal is called Phase 0. The terminal device 1 does not determine that the base station device 3 is transmitting a signal until the start of Slot 1, and determines that the base station device 3 is transmitting PDCCH and PDSCH signals in Slot 1. In other words, Slot 1 is a slot of Phase 0. The state from when it is determined that the base station device 3 is transmitting a signal until it is instructed to transmit HARQ-ACK is called Phase 1. The terminal device 1 is instructed to transmit HARQ-ACK in Slot 6, and Slots 2 to 5 are slots of Phase 1. The state until it is determined that the base station device 3 is transmitting a signal after it is instructed to transmit HARQ-ACK is also Phase 0. In other words, the slots from Slot 6 onwards are slots of Phase 0. The terminal device 1 monitors PDCCH candidates in the second search space in the Phase 0 slot. The terminal device 1 monitors PDCCH candidates in the first search space in the Phase 1 slot. The base station device 3 sets the second search space for the terminal device 1 in the Phase 0 slot. The base station device 3 sets the first search space for the terminal device 1 in the Phase 1 slot.

The terminal device 1 may monitor PDCCH candidates in the fourth search area in the Phase 0 slot. The terminal device 1 may monitor PDCCH candidates in the third search area in the Phase 1 slot. The base station device 3 may set a fourth search area for the terminal device 1 in the Phase 0 slot. The base station device 3 may set a third search area for the terminal device 1 in the Phase 1 slot.

In FIG. 14, a case has been described in which HARQ-ACK corresponding to PDSCH is transmitted within the same COT, but transmission of HARQ-ACK corresponding to PDSCH is postponed and PD
HARQ-ACK may be sent in a different COT than the SCH. In that case, the state from when it is determined that the base station device 3 is transmitting a signal until the timer (first timer) expires is referred to as Phase 1. The timer (first timer) starts counting after it is determined that the base station device 3 is transmitting a signal. The state after the timer (first timer) expires until it is determined that the base station device 3 is transmitting a signal is also Phase 0.

Note that the terminal device 1 does not need to monitor PDCCH candidates when transmitting HARQ-ACK or the like on the uplink, that is, in a slot in which a signal is transmitted on the uplink. When the base station device 3 instructs the terminal device 1 to transmit HARQ-ACK etc. on the uplink, that is, in the slot where the terminal device 1 instructs the terminal device 1 to transmit a signal on the uplink, the base station device 3 There is no need to set a search area for.

As described above, the present invention can efficiently use resources and realize efficient communication. If the timing at which the base station device 3 becomes able to transmit a signal after LBT does not match the slot boundary, the base station device 3 searches for a search area configured in the OFDM symbol in the first half of the slot, or It is possible to allocate a PDSCH by transmitting a PDCCH to the terminal device 1 using the PDCCH candidates in the search area configured in the OFDM symbol in the latter half of the slot. In other words, the base station device 3 can transmit the PDCCH to the terminal device 1 using PDCCH candidates in the search area close to the timing (timing when signal transmission becomes possible after LBT), so the scheduling The standby time is shortened, and it is possible to prevent a decline in the utilization efficiency of unlicensed frequency band resources (channels, frequencies). The terminal device 1 can receive data using many resources, and the transmission speed can be improved. On the other hand, after LBT, the PDSCH can be scheduled from the OFDM symbol in the first half of the slot, so the search area is not set in the OFDM symbol in the second half of the slot (or it is set in the OFDM symbol in the second half of the slot). Blind decoding (PDCCH decoding processing ), it is possible to increase the scheduling flexibility of allocating PDCCHs without increasing the load on the PDCCH. When the number of PDCCH candidates in the search area is small, the probability of occurrence of blocking phenomenon in which resources (control channel elements) constituting the PDCCH candidates collide between terminal devices 1 increases. If the number increases, the probability of blocking occurrence of PDCCH candidates can be suppressed, and PDCCHs can be flexibly allocated to the terminal device 1.

After the COT ends, it is not known at what timing the base station device 3 can transmit a signal, so the terminal device 1 uses a search area composed of OFDM symbols in the first half of the slot and a search area in the second half of the slot. It is preferable to monitor PDCCH candidates with a search area configured of OFDM symbols. However, the terminal device 1 may not be able to detect the end position of the COT. For example, if the terminal device 1 is not capable of detecting information indicating the end position of COT, and if the base station device 3 is unable to transmit information indicating the end position of COT, the terminal device 1 detects the end position of COT. For example, when the detection of information indicating the On the other hand, if switching from downlink to uplink occurs only once within the COT, PDSCH cannot be allocated after the uplink slot starts. In such a situation, after the uplink slot starts, the terminal device 1 waits for scheduling by the base station device 3 by monitoring PDCCH candidates in the search area configured in the OFDM symbols in the latter half of the slot. It is possible to shorten the time and prevent a decrease in the utilization efficiency of unlicensed frequency band resources (channels, frequencies). The base station device 3 can immediately allocate a PDSCH to the terminal device 1 after the COT ends and the LBT is successful.

Hereinafter, aspects of various devices according to one aspect of this embodiment will be described.

(1) In order to achieve the above object, aspects of the present invention take the following measures. That is, a first aspect of the present invention is a terminal device comprising a processor and a memory storing a computer program code, the terminal device comprising: a processor; and a memory storing a computer program code; monitoring PDCCH candidates in a first search area from 1 to a slot before a slot in which transmission of HARQ-ACK is instructed; and in a second search area in a slot after the slot in which transmission of HARQ-ACK is instructed. performing operations including monitoring PDCCH candidates;

(2) The first aspect of the present invention further provides that, when it is instructed to postpone the transmission of HARQ-ACK, PDCCH candidates are monitored in the first search area until the timer expires. , monitoring PDCCH candidates in the second search area in a slot after the timer expires.

(3) In the first aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

(4) A second aspect of the present invention is a communication method used in a terminal device, in which HARQ-ACK transmission is instructed from a slot after a slot in which a base station device is determined to be transmitting a signal. monitoring PDCCH candidates in a first search area up to the slot before the slot in which the HARQ-ACK is transmitted; and monitoring PDCCH candidates in a second search area in slots after the slot in which transmission of the HARQ-ACK is instructed. ,including.

(5) The second aspect of the present invention further provides the step of monitoring PDCCH candidates in the first search area until the timer expires, when the transmission of HARQ-ACK is instructed to be postponed. and monitoring PDCCH candidates in the second search area in slots after the timer expires.

(6) In the second aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

(7) A third aspect of the present invention is a base station device comprising a processor and a memory storing a computer program code, the base station device transmitting HARQ-ACK from a slot after a slot in which signal transmission is started. A first search area is set for the terminal device up to the slot before the slot in which transmission of the HARQ-ACK is instructed, and a second search area is set in the terminal device in the slot after the slot in which the transmission of the HARQ-ACK is instructed. perform actions, including configuring

(8) In a third aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

(9) A fourth aspect of the present invention is a communication method used in a base station device, which starts from a slot after a slot in which signal transmission is started and a slot before a slot in which transmission of HARQ-ACK is instructed. and setting a second search area for the terminal device in a slot after the slot in which transmission of the HARQ-ACK is instructed. include.

(10) In a fourth aspect of the present invention, the first search area is set to OFDM symbols in the first half of the slot, and the second search area is set to OFDM symbols in the first half and the second half of the slot. Ru.

A program that operates on the base station device 3 and the terminal device 1 related to the present invention is a program that controls a CPU (Central Processing Unit) etc. program). The 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) and HDD.
The data is stored in a hard disk drive (D), and read, modified, and written by the CPU as necessary.

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

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

Furthermore, a "computer-readable recording medium" refers to 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. In this case, it may also include a device that retains a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client. Further, the above-mentioned program may be one for realizing a part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

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

Furthermore, the base station device 3 in the embodiment described above can also be realized as an aggregate (device group) composed of a plurality of devices. Each of the devices constituting the device group may include a part or all of each function or each functional block of the base station device 3 related to the embodiment described above. As a device group, it is sufficient to have each function or each functional block of the base station device 3. Further, the terminal device 1 according to the embodiment described above can also communicate with a base station device as an aggregate.

Further, the base station device 3 in the embodiment described above 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 embodiment described above may have some or all of the functions of an upper node for eNodeB and/or gNB.

Moreover, a part or all of the terminal device 1 and the base station device 3 in the embodiments described above may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually chipped, or a part or all of them may be integrated into a chip. Moreover, the method of circuit integration is not limited to LSI, but may be implemented using a dedicated circuit or a general-purpose processor. Further, if an integrated circuit technology that replaces LSI emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on this technology.

Furthermore, in the embodiments described above, a terminal device was described as an example of a communication device, but the present invention is not limited to this, and the present invention is applicable to stationary or non-movable electronic devices installed indoors or outdoors, For example, it can be applied to terminal devices or communication devices such as AV equipment, kitchen equipment, cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and may include design changes within the scope of the gist of the present invention. Further, the present invention can be modified in various ways within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included within the technical scope of the present invention. It will be done. Also included are configurations in which the elements described in each of the above embodiments are replaced with each other and have similar effects.

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

Claims (2)

A terminal device comprising a processor and a memory storing a computer program code, the terminal device comprising:
monitoring PDCCH candidates in a first search area from a slot after a slot in which the base station device is determined to be transmitting a signal to a slot in front of a slot in which transmission of HARQ-ACK is instructed;
Monitoring PDCCH candidates in a second search area in a slot after the slot in which transmission of the HARQ-ACK is instructed ;
monitoring PDCCH candidates in the first search area until a timer expires if indicated to postpone the transmission of HARQ-ACK;
performing operations comprising: monitoring PDCCH candidates in the second search area in a slot subsequent to the slot after the timer expires;
The first search area is set to an OFDM symbol in the first half of the slot,
The second search area is set to OFDM symbols in the first half and the second half of the slot.
Terminal device. A communication method used in a terminal device,
monitoring PDCCH candidates in a first search area from the slot after the slot in which the base station apparatus is determined to be transmitting a signal to the slot in front of the slot in which transmission of HARQ-ACK is instructed;
Monitoring PDCCH candidates in a second search area in slots after the slot in which transmission of the HARQ-ACK is instructed ,
If the transmission of HARQ-ACK is instructed to be postponed, monitoring PDCCH candidates in the first search area until the timer expires;
monitoring PDCCH candidates in the second search area in slots after the timer expires;
The first search area is set to an OFDM symbol in the first half of the slot,
The second search area is set to OFDM symbols in the first half and the second half of the slot.
Communication method.

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