WO2020059419A1 - Terminal device, base station device, and communication method - Google Patents

Abstract

The present invention performs communication efficiently without incurring an increase in the processing load of a terminal device. Provided is a terminal device provided with a wireless resource control layer processing unit for setting a first control resource set and a second control resource set, and a reception unit for monitoring a PDCCH candidate in each of the control resource sets. The first control resource set is configured from an OFDM symbol in the first-half portion of a slot, and the second control resource set is configured from an OFDM symbol in the latter-half portion of the slot. A first number of PDCCH candidates in the second control resource set are monitored in a first slot in which it is determined that a base station device is transmitting a signal, a second number of PDCCH candidates in the first control resource set are monitored in a second slot next to the first slot, and a third number of PDCCH candidates in the first control resource set are monitored in a third slot next to the second slot.

Description

Terminal device, base station device, and communication method

<< The present invention relates to a terminal device, a base station device, and a communication method. This application claims priority based on Japanese Patent Application No. 2018-176139 for which it applied to Japan on September 20, 2018, and uses the content here.

The third generation partnership project (3GPP: 3rd Generation Partnership) is a wireless access method and a wireless network (hereinafter, "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") of cellular mobile communication. Project). 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 a base station device are arranged in a cell shape. A single base station device may manage a plurality of cells.

In 3GPP, the International Telecommunications Union (ITU: International Telecommunications Union) formulates a next-generation mobile communication system standard, IMT (International Mobile Telecommunications) -2020, so it proposes a next-generation standard (NR: New Radio). (Non-Patent Document 1). In a single technology framework, the NR is based on e-MBB (enhanced Mobile Broadband), mMTC (massive Machine Type Type Communication), and URLLC (Ultra Reliable and Low Latency Communication that satisfies the three scenarios that satisfy the requirements. I have.

Also, studies are being made on the application of NR in unlicensed frequency bands (Unlicensed Spectrum) (Non-Patent Document 2). It has been studied to realize a data rate of several Gbps by applying an NR supporting a wide band of 100 MHz to a carrier in an unlicensed frequency band.

い く つ か In some countries of the world, it is necessary to apply Listen-Before-Talk (LBT) in unlicensed frequency bands. Carrier sense is performed before transmission starts, and transmission within a predetermined time length is enabled only when it is confirmed by carrier sense that resources (channels, frequency bands) are not applied to other nearby systems. The mechanism is LBT.

の 一 One embodiment of the present invention realizes application of NR while applying LBT in an unlicensed frequency band. One embodiment of the present invention is a terminal device capable of performing efficient communication, a communication method used for the terminal device, a base station device capable of performing efficient communication, and a base station device capable of performing efficient communication. Provide a communication method.

(1) A first aspect of the present invention is a terminal device that receives a PDCCH in a slot from a base station device, and sets a first control resource set and a second control resource set based on RRC signaling. A resource control layer processing unit, a receiving unit that monitors a PDCCH candidate in the first control resource set and the second control resource set, and a decoding unit that decodes the PDCCH candidate, wherein the first control resource The set is composed of the first half OFDM symbols of the slot, and the second control resource set is composed of the second half OFDM symbols of the slot, and the second control resource set is the second control resource set determined that the base station apparatus is transmitting a signal. Monitoring a first number of the PDCCH candidates in the second control resource set in one slot, Monitoring a second number of said PDCCH candidates in said first control resource set in a second slot next to said first control resource set, said first control resource set in a third slot next to said second slot. And monitoring a third number of the PDCCH candidates within the PDCCH.

(2) The first aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(3) A second aspect of the present invention is a communication method used for a terminal device that receives a PDCCH in a slot from a base station device, wherein the first control resource set and the second control resource are based on RRC signaling. Setting a set, monitoring a PDCCH candidate in the first control resource set and the second control resource set, and decoding the PDCCH candidate, wherein the first control resource set comprises: The first control resource set is composed of OFDM symbols of the first half of the slot, and the second control resource set is composed of OFDM symbols of the second half of the slot, and the first control resource set is determined to be transmitting a signal. Monitoring a first number of said PDCCH candidates in said second control resource set in a slot, Monitoring a second number of said PDCCH candidates in said first control resource set in a second slot next to said slot, said first control resource in a third slot next to said second slot A third number of the PDCCH candidates in the set are monitored.

(4) The second aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(5) A third aspect of the present invention is a base station apparatus for transmitting a PDCCH in a slot, and radio resource control for setting a first control resource set and a second control resource set for a terminal apparatus A layer processing unit, comprising a transmitting unit that transmits the PDCCH using a PDCCH candidate in the first control resource set or the second control resource set in the slot, wherein the first control resource set is The second control resource set is composed of OFDM symbols of the first half of the slot, and the second control resource set is composed of OFDM symbols of the second half of the slot. Signal transmission to the terminal device starts first after Listen-Before-Talk. A first number of the PDCCH candidates is configured in the second control resource set in a first slot to be performed. The second number of the PDCCH candidates is configured in the first control resource set in the second slot next to the first slot, and the second number of the PDCCH candidates is configured in the third slot next to the second slot. The third number of the PDCCH candidates is configured in one control resource set.

(6) The third aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(7) A fourth aspect of the present invention is a communication method used for a base station apparatus transmitting a PDCCH in a slot, wherein a first control resource set and a second control resource set are transmitted to a terminal apparatus. Setting, and transmitting the PDCCH using a PDCCH candidate in the first control resource set or the second control resource set in the slot, wherein the first control resource set is , And the second control resource set includes OFDM symbols in the latter half of the slot, and after the Listen-Before-Talk, signal transmission to the terminal device starts first. A first number of said PDCCH candidates in said second control resource set in a first slot Is configured, a second number of the PDCCH candidates is configured in the first control resource set in a second slot next to the first slot, and the PDCCH candidate is configured in a third slot next to the second slot. The third control resource set includes a third number of the PDCCH candidates.

(8) A fourth aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

According to one embodiment of the present invention, the terminal device can efficiently communicate. Further, the base station device can communicate efficiently. The terminal device can communicate efficiently without increasing the processing load of the terminal device. The base station device can perform communication efficiently without increasing the processing load of the terminal device.

FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. 4 is an example showing a configuration of a radio frame, a subframe, and a slot according to an aspect of the present embodiment. It is a figure showing the example of composition of the slot and the mini slot concerning one mode of this embodiment. FIG. 4 is a diagram illustrating an example of control resource set mapping according to an aspect of the present embodiment. FIG. 5 is a diagram illustrating an example of a resource element included in a slot according to an aspect of the present embodiment. FIG. 3 is a diagram illustrating an example of a configuration of one REG according to an aspect of the present embodiment. FIG. 3 is a diagram illustrating a configuration example of a CCE according to an aspect of the present embodiment. FIG. 11 is a diagram illustrating an example of a relationship between the number of REGs configuring a REG group and a method of mapping PDCCH candidates according to an aspect of the present embodiment. FIG. 9 is a diagram illustrating an example of mapping of REGs configuring a CCE according to an aspect of the present embodiment. FIG. 1 is a schematic block diagram illustrating a configuration of a terminal device 1 of the present embodiment. FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to the present embodiment. FIG. 9 is a diagram illustrating an example of a first initial connection procedure (4-step contention based RACH procedure) according to an aspect of the embodiment. FIG. 4 is a diagram illustrating an example of a first control resource set and a second control resource set set in the terminal device 1 according to an aspect of the present embodiment. FIG. 4 is a diagram illustrating an example of a first control resource set and a second control resource set set in the terminal device 1 according to an aspect of the present embodiment. FIG. 4 is a diagram illustrating an example of a first control resource set and a second control resource set set in the terminal device 1 according to an aspect of the present embodiment. It is a figure showing an example of a PDCCH candidate monitored by terminal unit 1 concerning one mode of this embodiment. It is a figure showing an example of a PDCCH candidate monitored by terminal unit 1 concerning one mode of this embodiment.

Hereinafter, embodiments of the present invention will be described.

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

Hereinafter, various wireless parameters related to communication between the terminal device 1 and the base station device 3 will be described. Here, at least some of the wireless parameters (for example, subcarrier spacing (SCS): Subcarrier spacing) are also called Numerology. The radio parameters include a subcarrier interval, an OFDM symbol length, a subframe length, a slot length, and at least a part of a minislot length.

The subcarrier interval used for the wireless communication is determined by a communication method used for the wireless communication between the terminal device 1 and the base station device 3 (for example, OFDM: Orthogonal Frequency Division Multiplex, OFDMA: Orthogonal Frequency Division, Multispectrum, SC). FDMA: Single Carrier-Frequency Division Multiple Access, DFT-s-OFDM: One of the radio parameters for Discrete Fourier Transform-Spread-OFDM. For example, the subcarrier intervals are 15 kHz, 30 kHz, 60 kHz, and 120 kHz.

FIG. 2 is an example showing a configuration of a radio frame, a subframe, and a slot according to an aspect of the present embodiment. In the example shown in FIG. 2, the length of the slot is 0.5 ms, the length of the subframe is 1 ms, and the length of the radio frame 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 in a predetermined interval (for example, a transmission time interval (TTI: Transmission @ Time @ Interval)) defined by an upper layer (for example, MAC: Medium Access Control, RRC: Radio Resource Control). Data unit.

For example, the slot length may be given by the number of OFDM symbols. For example, the number of OFDM symbols may be seven or fourteen. The slot length may be given based at least on the length of the OFDM symbol. OFDM symbol lengths may differ based at least on subcarrier spacing. Further, the length of the OFDM symbol may be given based at least on the number of points of Fast Fourier Transform (FFT) used for generating the OFDM symbol. Further, the length of the OFDM symbol may include the length of a cyclic prefix (CP: Cyclic Prefix) added to the OFDM symbol. Here, the OFDM symbol may be referred to as a symbol. In the communication between the terminal device 1 and the base station device 3, when a communication method other than OFDM is used (for example, when SC-FDMA or DFT-s-OFDM is used), the generated SC is used. -FDMA symbols and / or DFT-s-OFDM symbols are also referred to as OFDM symbols. Unless otherwise specified, OFDM includes SC-FDMA or DFT-s-OFDM.

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

Here, OFDM includes a multicarrier communication system to which waveform shaping (Pulse Shape), PAPR reduction, out-of-band radiation reduction, or filtering, and / or phase processing (for example, phase rotation) is applied. The multi-carrier communication scheme may be a communication scheme for generating / transmitting a signal in which a plurality of subcarriers are multiplexed.

A radio frame may be given by the number of subframes. The number of subframes for a radio frame may be, for example, 10. Radio frames may be given by the number of slots.

FIG. 3 is a diagram illustrating a configuration example of a slot and a mini-slot according to one aspect of the present embodiment. Note that mini slots may be referred to as non-slots. In FIG. 3, the number of OFDM symbols constituting one slot is seven. The mini-slot may be configured by one or more OFDM symbols whose number is smaller than the number of the plurality of OFDM symbols forming the slot. Also, mini-slots may be shorter in length than slots. FIG. 3 shows minislot # 0 to minislot # 5 as an example of the configuration of the minislot. The mini-slot may be configured by one OFDM symbol as shown in mini-slot # 0. Further, the mini-slot may be configured by two OFDM symbols as shown in mini-slots # 1 to # 3. Also, a gap (time interval) may be inserted between two mini slots as indicated by mini slot # 1 and mini slot # 2. Further, as shown in mini-slot # 5, the mini-slot may be configured to straddle the boundary between slot # 0 and slot # 1. That is, the mini-slot may be configured to straddle the boundary of the slot. Here, the minislot is also called a subslot. The minislot is also called sTTI (short @ TTI: Transmission @ Time @ Interval).

In the following, a slot may be replaced with a mini slot. A minislot may be configured with the same number of OFDM symbols as a slot. The mini-slot may be configured with a larger number of OFDM symbols than the number of the plurality of OFDM symbols forming the slot. The length of the time domain of the minislot may be shorter than the length of the slot. The length of the time domain of the minislot may be shorter than the length of the subframe.

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

In FIG. 1, in the uplink wireless communication from the terminal device 1 to the base station device 3, at least the following uplink physical channels are used. The uplink physical channel is used by the physical layer to transmit and receive information output from the upper layer.
・ PUCCH (Physical Uplink Control Channel)
・ PUSCH (Physical Uplink Shared Channel)
・ PRACH (Physical Random Access Channel)

The PUCCH is used for transmitting and receiving uplink control information (UCI: Uplink Control Information). The uplink control information includes channel state information (CSI: Channel State Information) of a downlink channel and a scheduling request (SR: SR) used to request a PUSCH (UL-SCH: Uplink-Shared Channel) resource for initial transmission. Scheduling Request, downlink data (TB: Transport block, MAC PDU: Medium Access Control Protocol Data Unit, DL-SCH: Downlink-Shared Hash Channel, DSCH-Dash-Phash-Phash-Phash-Phash-Phone). Including the Repeat request ACKnowledgement). HARQ-ACK indicates ACK (acknowledgement) or NACK (negative-acknowledgement). HARQ-ACK is also referred to as HARQ feedback, HARQ information, HARQ control information, and ACK / NACK. PUCCH may use a plurality of formats (PUCCH @ format). Different signal processing may be applied for each format. The amount of information that can be transmitted may differ for each format. The type of transmittable uplink control information may be different for each format.

The channel state information (CSI: Channel State Information) includes at least a channel quality indicator (CQI: Channel Quality Indicator). The channel state information may include a rank indicator (RI: Rank @ Indicator). The channel state information may include a precoder matrix indicator (PMI: Precoder @ Matrix @ Indicator). CQI is an index related to channel quality (propagation strength), and PMI is an index indicating a precoder. RI is an index indicating the transmission rank (or the number of transmission layers).

The PUSCH is used for transmitting and receiving uplink data (TB, MAC PDU, UL-SCH, PUSCH). The PUSCH may be used to transmit and receive HARQ-ACK and / or channel state information along with uplink data. Also, PUSCH may be used to transmit / receive only channel state information, or only HARQ-ACK and channel state information. The PUSCH may be used for transmitting and receiving the random access message 3.

PRACH is used for transmitting and receiving a random access preamble (random access message 1). The PRACH transmits an initial connection establishment (initial connection establishment) procedure, a handover procedure, a connection reestablishment procedure (connection @ re-establishment) procedure, synchronization (timing adjustment) for transmission of uplink data, and a request for a PUSCH (UL-SCH) resource. Used to indicate. 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.

The random access preamble may be given by cyclically shifting the Zadoff-Chu sequence corresponding to the physical root sequence index u. The Zadoff-Chu sequence may be generated based on the physical root sequence index u. A plurality of random access preambles may be defined in one cell. The random access preamble may be specified based at least on the index of the random access preamble. Different random access preambles corresponding to different indexes of the random access preamble may correspond to different combinations of the physical root sequence index u and the cyclic shift. The physical root sequence index u and the cyclic shift (a value of the cyclic shift) may be given based at least on information included in the system information. The physical root sequence index u may be an index for identifying a sequence included in the random access preamble. The random access preamble may be specified based at least on the physical root sequence index u.

In FIG. 1, the following uplink physical signals are used in uplink wireless communication. The uplink physical signal may not be used for transmitting and receiving information output from the upper layer, but is used by the physical layer.
-Uplink reference signal (UL RS: Uplink Reference Signal)

In the present embodiment, at least the following two types of uplink reference signals may be used.
・ DMRS (Demodulation Reference Signal)
・ SRS (Sounding Reference Signal)

DMRS is related to transmission and reception of PUSCH and / or PUCCH. DMRS is multiplexed with PUSCH or PUCCH. The base station device 3 uses DMRS to perform propagation path correction of PUSCH or PUCCH. Hereinafter, transmitting the PUSCH and the DMRS together is simply referred to as transmitting the PUSCH. Hereinafter, transmitting the PUCCH and the DMRS together is simply referred to as transmitting the PUCCH. Hereinafter, receiving both the PUSCH and the DMRS is simply referred to as receiving the PUSCH. Hereinafter, receiving both the PUCCH and the DMRS is simply referred to as receiving the PUCCH.

SRS may not be related to transmission / reception of PUSCH or PUCCH. The base station device 3 may use the SRS for measuring the channel state. The SRS may be transmitted and received at the end of a subframe in an uplink slot or a predetermined number of OFDM symbols from the end.

In FIG. 1, the following downlink physical channel is 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 and receive information output from the upper layer.
・ PBCH (Physical Broadcast Channel)
・ PDCCH (Physical Downlink Control Channel)
・ PDSCH (Physical Downlink Shared Channel)

The PBCH is used to broadcast a master information block (MIB: Master Information Block, BCH: Broadcast Channel) commonly used in the terminal device 1. The PBCH may be transmitted based on a predetermined transmission interval. For example, the PBCH may be transmitted at 80 ms intervals. The content of the information included in the PBCH may be updated every 80 ms. The PBCH may be configured with 288 subcarriers. The PBCH may be configured to include two, three, or four OFDM symbols. The MIB may include information related to an identifier (index) for the synchronization signal. The MIB may include information indicating a slot number in which the PBCH is transmitted, a subframe number, and at least a part of a radio frame number.

The PDCCH (NR PDCCH) is used for transmitting and receiving downlink control information (DCI: Downlink Control Information). Downlink control information is also called DCI format. The downlink control information may include at least either a downlink grant (downlink @ grant) or an uplink grant (uplink @ grant). A downlink grant is also called a downlink assignment (downlink @ assignment) or a downlink assignment (downlink @ allocation).

The downlink control information may include Unlicensed access common information. The Unlicensed @ access common information is control information on access, transmission, and the like in the unlicensed frequency band. The Unlicensed access common information may be information of a downlink subframe configuration (Subframe configuration for Unlicensed Access). The downlink subframe configuration may be based on the position of the OFDM symbol occupied in the subframe in which the PDCCH including the downlink subframe configuration information is allocated and / or the PDCCH including the downlink subframe configuration information. Indicates the position of the OFDM symbol that is occupied in the next subframe of the subframe to be used. In the occupied OFDM symbol, transmission and reception of a downlink physical channel and a downlink physical signal are performed. The Unlicensed access common information may be information on an 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 including the information of the uplink subframe configuration is arranged, and the subframe of the uplink subframe. Indicates a number. The terminal device 1 is not required to receive the downlink physical channel and the downlink physical signal in the subframe indicated by the information of the uplink subframe configuration.

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

One downlink grant is used at least for scheduling one PDSCH in one serving cell. The downlink grant is used at least for scheduling PDSCH in the same slot as the 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.

One uplink grant is used at least for scheduling of one PUSCH in one serving cell.

The downlink subframe configuration may be indicated as the {Unlicensed} access common information. The downlink subframe configuration indicates the configuration of the OFDM symbol occupied by the subframe. The terminal device 1 recognizes a downlink physical channel and an OFDM symbol used for transmitting a physical signal in the base station device 3 from the OFDM symbol occupied by the subframe indicated by the downlink subframe configuration. OFDM symbols occupied by the current subframe and / or the next subframe may be indicated. Here, the current subframe refers to a subframe in which the Unlicensed @ access common information including the information on the downlink subframe configuration is received. For example, it is shown that 14 OFDM symbols are occupied in the next subframe. For example, it is shown that ten OFDM symbols are occupied in the next subframe. For example, it is shown that three 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 six OFDM symbols are occupied in the current subframe. For example, it is shown that three OFDM symbols are occupied in the current subframe.

The \ Unlicensed \ access common information may be information on an uplink subframe configuration (UL \ duration \ offset). The uplink subframe configuration includes the position of the subframe where the uplink subframe starts based on the subframe in which the PDCCH including the information of the uplink subframe configuration is arranged, and the subframe of the uplink subframe. Indicates a number. The terminal device 1 is not required to receive the downlink physical channel and the downlink physical signal in the subframe indicated by the information of the uplink subframe configuration. For example, the first subframe and one subframe from the reference subframe are shown, and the terminal device 1 transmits the downlink physical channel and the downlink physical signal in the first subframe from the reference subframe. Is not required to be received. For example, the first sub-frame and six sub-frames from the reference sub-frame are shown, and the terminal device 1 has the first sub-frame, the second sub-frame and the three It is not required to receive a downlink physical channel and a downlink physical signal in the fourth subframe, the fourth subframe, the fifth subframe, and the sixth subframe. For example, the sixth subframe and three subframes from the reference subframe are shown, and the terminal device 1 displays the sixth subframe, the seventh subframe, and the eight subframes from the reference subframe. It is not required to receive a downlink physical channel and a downlink physical signal in the first subframe.

In the terminal device 1, one or a plurality of control resource sets (CORESET) (control resource set) are set (configured) in order to search for the PDCCH. The terminal device 1 attempts to receive the PDCCH in the set control resource set. Details of the control resource set will be described later.

PDSCH is used for transmitting and receiving downlink data (DL-SCH, PDSCH). The PDSCH is used at least for transmitting and receiving a random access message 2 (random access response). The PDSCH is used at least for transmitting and receiving system information including parameters used for initial access.

In FIG. 1, the following downlink physical signals are used in downlink wireless communication. The downlink physical signal may not be used for transmitting and receiving information output from the upper layer, but is used by the physical layer.
-Synchronization signal (SS: Synchronization signal)
-Downlink reference signal (DL RS: Downlink Reference Signal)

The synchronization signal is used by the terminal device 1 to synchronize the downlink frequency domain and the time domain. The synchronization signal includes PSS (Primary @ Synchronization @ Signal) and SSS (Secondary @ Synchronization @ Signal).

The downlink reference signal is used by the terminal device 1 to perform channel correction of the downlink physical channel. The downlink reference signal is used by the terminal device 1 to calculate downlink channel state information.

In this embodiment, at least the following types of downlink reference signals are used.
・ DMRS (DeModulation Reference Signal)

DMRS corresponds to transmission and reception of PDCCH and / or PDSCH. DMRS is multiplexed on PDCCH or PDSCH. The terminal device 1 may use the PDCCH or the DMRS corresponding to the PDSCH in order to perform channel correction of the PDCCH or the PDSCH. Hereinafter, transmitting the PDCCH and the DMRS corresponding to the PDCCH together is simply referred to as transmitting the PDCCH. Hereinafter, the reception of the PDCCH and the DMRS corresponding to the PDCCH together is simply referred to as the reception of the PDCCH. Hereinafter, transmitting the PDSCH and the DMRS corresponding to the PDSCH together is referred to simply as transmitting the PDSCH. Hereinafter, the fact that the PDSCH and the DMRS corresponding to the PDSCH are received together is simply referred to as the PDSCH being received.

DMRS may be an RS individually set in the terminal device 1. The DMRS sequence may be given based at least on parameters individually set in the terminal device 1. DMRS may be transmitted separately for PDCCH and / or PDSCH. The DMRS may be an RS that is commonly set for a plurality of terminal devices 1. The DMRS sequence may be given irrespective of parameters individually set in the terminal device 1. For example, a DMRS sequence may be given based on at least a part of a slot number, a minislot number, and a cell ID (identity). The DMRS may be a PDCCH and / or an RS transmitted regardless of whether the PDSCH is being transmitted.

The downlink physical channel and the downlink physical signal are also referred to as a downlink signal. The uplink physical channel and the uplink physical signal are also called an uplink signal. 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, UL-SCH and DL-SCH are transport channels. A channel used in a medium access control (MAC) layer is called a transport channel. The unit of the transport channel used in the MAC layer is also called a transport block or MAC @ PDU. HARQ (Hybrid Automatic Repeat Repeat reQuest) is controlled for each transport block in the MAC layer. The transport block is a unit of data that the MAC layer passes (deliver) to the physical layer. In 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) signals in an upper layer (higher layer). For example, in the radio resource control (RRC) layer, the base station apparatus 3 and the terminal apparatus 1 transmit and receive RRC signaling (RRC message: Radio Resource Control message, RRC information: Transmission / Reception also referred to as Radio Resource Control). May be. Further, the base station device 3 and the terminal device 1 may transmit and receive MAC @ CE (Control @ Element) in the MAC layer. Here, RRC signaling and / or MAC @ CE are also referred to as higher layer signals (higher layer signaling).

PUSCH and PDSCH are used at least for transmitting and receiving RRC signaling and MAC CE. Here, the RRC signaling transmitted by the PDSCH from the base station device 3 may be a common signaling to a plurality of terminal devices 1 in the cell. Signaling common to a plurality of terminal devices 1 in a cell is also referred to as common RRC signaling. The RRC signaling transmitted by the PDSCH from the base station device 3 may be signaling dedicated to a certain terminal device 1 (also referred to as dedicated @ signaling or UE @ specific @ signaling). Signaling dedicated to the terminal device 1 is also referred to as dedicated RRC signaling. The cell-specific parameter may be transmitted using common signaling for a plurality of terminal devices 1 in a cell or dedicated signaling for a certain terminal device 1. The UE-specific parameter may be transmitted to a certain terminal device 1 using dedicated signaling. A PDSCH including dedicated RRC signaling may be scheduled by a PDCCH in a control resource set. A PDSCH including common RRC signaling may be scheduled by a PDCCH in a control resource set.

BCCH (Broadcast Control Channel), CCCH (Common Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, the BCCH is an upper layer channel used for transmitting and receiving MIB. The CCCH (Common \ Control \ Channel) is an upper-layer channel used for transmitting and receiving common information in a plurality of terminal devices 1. Here, the CCCH is used, for example, for the terminal device 1 that is not connected to the RRC. The DCCH (Dedicated Control Channel) is an upper layer channel used for transmitting and receiving individual control information (dedicated control information) to and from the terminal device 1. Here, the DCCH is used, for example, for the terminal device 1 connected to the RRC.

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

ＵUL-SCH in transport channel is mapped to PUSCH in physical channel. The DL-SCH in the transport channel is mapped to the PDSCH in the physical channel. The BCH in the transport channel is mapped to the PBCH in the physical channel.

Hereinafter, the control resource set will be described.

FIG. 4 is a diagram illustrating an example of mapping of a control resource set according to an aspect of the present embodiment. A control resource set may be a time-frequency domain to which one or more control channels may be mapped. The control resource set may be an area where the terminal device 1 attempts to receive and / or detect the PDCCH (blind detection (BD: Blind @ Decoding)). As shown in FIG. 4A, the control resource set (control resource set # 0) may be configured by continuous resources (Localized resources) in the frequency domain. Further, as shown in FIG. 4B, the control resource set (control resource set # 1) may be configured by discontinuous resources (distributed @ resource) in the frequency domain.

に お い て In the frequency domain, the unit of mapping of the control resource set may be a resource block. The control resource set may be composed of a plurality of resource blocks. In the frequency domain, the unit of mapping of the control resource set may be a plurality of resource blocks. In the time domain, the unit of mapping of the control resource set may be an OFDM symbol. The control resource set may be composed of one, two, or three OFDM symbols.

周波 数 The frequency domain of the control resource set may be the same as the system bandwidth of the serving cell. Further, the frequency domain of the control resource set may be given based at least on the system bandwidth of the serving cell. The frequency domain of the control resource set may be provided based at least on higher layer signaling or system information. For example, the position of the resource block configuring the control resource set is reported from the base station apparatus 3 to the terminal apparatus 1 using signaling of an upper layer. For each control resource set, the position of the resource block configuring the control resource set is reported from the base station device 3 to the terminal device 1 using the signaling of the upper layer.

時間 The time domain of the control resource set may be provided based at least on upper layer signaling or system information. For example, the number of OFDM symbols constituting the control resource set is reported from the base station device 3 to the terminal device 1 using the signaling of the upper layer. For example, the start position of the OFDM symbol constituting the control resource set is reported from the base station device 3 to the terminal device 1 using the signaling of the upper layer. For example, the end position of the OFDM symbol constituting the control resource set is reported from the base station device 3 to the terminal device 1 using the signaling of the upper layer. For example, the position of the subframe in which the control resource set is arranged is notified from the base station device 3 to the terminal device 1 using signaling of an upper layer. For example, the position of the slot in which the control resource set is allocated is notified from the base station device 3 to the terminal device 1 using signaling of an upper layer. For example, the cycle of the subframe in which the control resource set is arranged is notified from the base station apparatus 3 to the terminal apparatus 1 using signaling of an upper layer. For example, the cycle of the slot in which the control resource set is arranged is notified from the base station device 3 to the terminal device 1 using signaling of an upper layer.

As the control resource set, one or both types of a common control resource set (Common control resource set) (Common RESET) and a dedicated control resource set (Dedicated control resource set) (UE specific RESET) may be used. The common control resource set may be a control resource set commonly set for a plurality of terminal devices 1. The common control resource set may be given based at least on a synchronization signal, MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, cell ID, and the like. For example, the position of a subframe (slot) in which a common control resource set is arranged may be given based at least on a synchronization signal, MIB, common RRC signaling, or the like. The dedicated control resource set may be a control resource set that is set to be used exclusively for the individual terminal device 1. The dedicated control resource set may be provided based at least on dedicated RRC signaling and / or the value of the C-RNTI.

The control resource set may be a set of control channels (or control channel candidates) monitored by the terminal device 1. The control resource set may include a set of control channels (or control channel candidates) monitored by the terminal device 1. The control resource set may be configured to include one or a plurality of search areas (search space, SS: Search @ Space). One or a plurality of search areas (search space, SS: Search @ Space) may be configured (set) in the control resource set.

The search area is configured to include one or more PDCCH candidates (PDCCH candidate). The terminal device 1 receives a PDCCH candidate included in the search area and tries to receive the PDCCH (monitors the PDCCH). Here, the PDCCH candidate is also referred to as a blind detection candidate (blind @ detection @ candidate).

The search area has two types: CSS (Common Search Space, common search area) and USS (UE-specific Search Space). The CSS may be a search area commonly set for a plurality of terminal devices 1. The USS may be a search area including a setting exclusively used for the individual terminal device 1. The CSS may be provided based at least on a synchronization signal, MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, cell ID, and the like. 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 of type 0 PDCCH @ CSS for the DCI format scrambled by the SI-RNTI used for transmitting system information in the primary cell, and for the DCI format scrambled by the RA-RNTI and TC-RNTI used for initial access. Type 1 PDCCH @ CSS may be used. As the CSS, a PDCCH @ CSS type for a 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 the predetermined RNTI may be a DCI format to which a CRC (Cyclic \ Redundancy \ Check) scrambled by the predetermined RNTI is added.

Note that the PDCCH and / or DCI included in the CSS does not include CIF (Carrier \ Indicator \ Field) indicating which PDCCH / DCI schedules the PDSCH or PUSCH for which serving cell (or which component carrier). You may.

Note that when carrier aggregation (CA: carrier aggregation) for performing communication (transmission and / or reception) by aggregating a plurality of serving cells and / or a plurality of component carriers for the terminal device 1 is set, a predetermined value is set. The PDCCH and / or DCI included in the USS for the serving cell (predetermined component carrier) includes a CIF indicating which PDCCH / DCI has scheduled the PDSCH or PUSCH for which serving cell and / or which component carrier.

When communication is performed with respect to the terminal device 1 using one serving cell and / or one component carrier, the PDCCH and / or DCI included in the USS includes any of the serving cells and / or Alternatively, the CIF indicating which component carrier PDSCH or PUSCH is scheduled may not be included.

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

In the common control resource set, a PDCCH including control information required for Unlicensed access (Unlicensed access common information) may be transmitted and received. In the common control resource set, the PDCCH including the resource allocation information of the PDSCH including the RMSI (Remaining Minimum System Information) may be transmitted and received. In the common control resource set, a PDCCH including resource allocation information of a PDSCH including a RAR (Random @ Access @ Response) may be transmitted and received. In the common control resource set, a PDCCH including control information indicating a pre-empted resource (Pre-emption @ resources) may be transmitted and received. In the common control resource set, a PDCCH including control information indicating a slot format indicator may be transmitted and received. Note that a plurality of common control resource sets may be configured, and each common control resource set may be arranged in a different subframe (slot). Note that a plurality of common control resource sets may be configured, and each common control resource set may be arranged in the same subframe (slot). A plurality of common control resource sets may be configured, and different PDCCHs and different control information may be arranged in each common control resource set.

複数 A plurality of dedicated control resource sets may be configured in a subframe (slot). A plurality of dedicated control resource sets may be configured, and each dedicated control resource set may be arranged in the same subframe (slot). A plurality of dedicated control resource sets may be configured, and each dedicated control resource set may be arranged in a different subframe (slot).

The physical resource of the search area is configured by a control channel constituent unit (CCE: Control \ Channel \ Element). The CCE is configured by a predetermined number of resource element groups (REG: Resource \ Group). For example, a CCE may be composed of six REGs. The REG may be configured by one OFDM symbol of one PRB (Physical Resource Block). That is, the REG may be configured to include 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 the PDCCH candidates included in the search area in the control resource set.

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

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 included in the PDCCH and / or the search area (DCI format size, payload size).

In addition, 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 In, for the time region corresponding to each start symbol, the type of search region for PDCCH included in the control resource set, the type of aggregation level, and the number of PDCCH candidates may be respectively set. The type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set, or may include DCI and / or higher layer signals (RRC signaling). ) May be provided / set, or may be specified / set in advance 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 one microsecond. Further, the predetermined period may be a period of one slot. Further, the predetermined period may be a period of one OFDM symbol.

In addition, when the start position (start symbol) of the PDCCH symbol is more than one for one control resource set, that is, when there are a plurality of timings for blindly detecting (monitoring) the PDCCH in a predetermined period, For the time domain corresponding to each start symbol, the type of the search domain, the type of the aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be respectively set. The type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set, or may be set via DCI and / or higher layer signals. It may be provided / set, or may be specified / set in advance by a specification.

As a method of indicating the number of PDCCH candidates, the number of PDCCH candidates to be reduced from a predetermined number may be 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 on PDCCH. If the terminal device 1 can set more than a predetermined number of control resource sets for one or a plurality of serving cells / component carriers, the terminal device 1 transmits / notifies the base station device 3 of the capability information related to the blind detection. Good.

If the terminal device 1 supports the first slot format and the second slot format, the terminal device 1 may transmit / notify the base station device 3 of the capability information related to the slot format.

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

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

If the terminal device 1 does not support the capability of detecting (blind detection) a control resource set greater than a predetermined number in a predetermined period, the terminal device 1 transmits / notifies capability information related to the blind detection. It is not necessary. If the base station apparatus 3 does not receive the capability information related to the blind detection, the base station apparatus 3 may configure the control resource set so as not to exceed a predetermined number for the blind detection, and may transmit the PDCCH. .

The setting related to the control resource set includes a parameter indicating an index (ControlResourceSetId) for identifying the control resource set. The setting related to the control resource set may include a parameter indicating the start position (start symbol) of the PDCCH. Also, the settings related to the control resource set include parameters indicating the time resource area of the control resource set (the number of OFDM symbols constituting the control resource set, the position of a subframe (slot) in which the control resource set is arranged). It may be. Further, the setting related to the control resource set may include a parameter indicating a frequency resource region of the control resource set (the number of resource blocks configuring the control resource set). The setting related to the control resource set may include a parameter indicating the type of mapping from the CCE to the REG. Further, the setting regarding the control resource set may include the REG bundle size. RRC signaling may be used for transmitting and receiving a message indicating a setting related to a control resource set. The SIB may be used for transmitting and receiving a message indicating a setting related to the control resource set. The MIB may be used for transmitting and receiving a message indicating a setting related to the control resource set.

The setting relating to the search area includes a parameter indicating an index (search area index) for identifying the search area. The setting related to the search area includes a parameter indicating the index of the control resource set in which the search area is arranged. The setting related to the search area may include parameters indicating the cycle and offset of the slot in which the search area is arranged. The setting regarding the search area may include a parameter indicating the number of slots in which the search areas are continuously arranged. The setting related to the search area may include a parameter indicating an OFDM symbol in a slot for monitoring a PDCCH candidate. The setting related to the search area may include a parameter indicating the number of PDCCH candidates to be monitored for each CCE aggregation level. The setting related to the search area may include a parameter indicating DCI @ format in which monitoring is performed. The setting relating to the search area may include a parameter indicating the type of the search area (CSS or USS). RRC signaling may be used for transmitting and receiving a message indicating a setting related to a search area. The SIB may be used for transmitting and receiving a message indicating the setting regarding the search area. The MIB may be used for transmitting and receiving a message indicating the setting regarding the search area.

Hereinafter, the unit of the physical resource according to the embodiment will be described.

FIG. 5 is a diagram illustrating an example of a resource element included in a slot according to an aspect of the present embodiment. Here, the resource element (RE) is a resource defined by one OFDM symbol and one subcarrier. As shown in FIG. 5, a slot includes N _symb OFDM symbols. The number of subcarriers contained in the slot, the number N _RB of resource blocks included in the slot may be given by the product of number of subcarriers N ^RB _SC per resource block. Here, a resource block is a group of resource elements in the time domain and the frequency domain. The resource block may be used as a unit for resource allocation in the time domain and / or the frequency domain. For example, N ^RB _SC may be 12. N _symb may be the same as the number of OFDM symbols included in the subframe. N _symb may be the same as the number of OFDM symbols included in the slot. N _RB may be provided based on the cell bandwidth and subcarrier spacing. Further, the N _RB may be given based on an upper layer signal (for example, RRC signaling) transmitted from the base station device 3 or the like. Further, the N _RB may be given based on the description of the specification. A resource element is identified by an index k for a subcarrier and an index 1 for an OFDM symbol.

FIG. 6 is a diagram illustrating an example of a configuration of one REG according to an aspect of the present embodiment. The REG may be configured by one OFDM symbol of one PRB. That is, the REG may be configured by 12 REs that are continuous in the frequency domain. Some of the plurality of REs constituting the REG may be REs to which no downlink control information is mapped. The REG may be configured to include an RE to which downlink control information is not mapped, or may be configured to not include an RE to which downlink control information is not mapped. The RE to which downlink control information is not mapped may be a RE to which a reference signal is mapped, an RE to which a channel other than a control channel is mapped, or a terminal device to which no control channel is mapped. 1 may be the RE assumed.

FIG. 7 is a diagram illustrating a configuration example of a CCE according to an aspect of the present embodiment. The CCE may be composed of six REGs. As shown in FIG. 7A, the CCE (CCE # 0) may be configured by REGs that are continuously mapped (such mapping may be referred to as Localized @ mapping) (such mapping May be referred to as non-interleaved @ CCE-to-REG @ mapping) (such a mapping may be referred to as non-interleaved @ mapping). Note that not all REGs constituting the CCE need be continuous in the frequency domain. For example, when all of the plurality of resource blocks constituting the control resource set are not continuous in the frequency domain, even if the numbers assigned to the REGs are consecutive, each resource block constituting each consecutive number of REGs is Not continuous in the frequency domain. When the control resource set is composed of a plurality of OFDM symbols and the plurality of REGs constituting one CCE are arranged over a plurality of time sections (OFDM symbols), as shown in FIG. 7B, the CCE (CCE # 1) may be composed of groups of REGs that are continuously mapped.

As shown in FIG. 7 (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 is referred to as "Distributed @ mapping"). The mapping may be referred to as interleaved @ CCE-to-REG @ mapping (such a mapping may be referred to as interleaved @ mapping). REGs constituting a CCE using an interleaver may be discontinuously mapped to time-frequency domain resources. When the control resource set includes a plurality of OFDM symbols and a plurality of REGs configuring one CCE are arranged over a plurality of time sections (OFDM symbols), as illustrated in FIG. # 3) may be configured by REGs in which REGs of different time sections (OFDM symbols) are mixed and mapped discontinuously. As illustrated in FIG. 7E, the CCE (CCE # 4) may be configured by REGs that are distributed and mapped in a group of a plurality of REGs. As shown in FIG. 7 (f), the CCE (CCE # 5) may be configured by REGs that are distributed and mapped in a group of a plurality of REGs.

The $ CCE may be configured to include one or a plurality of REG groups. REG groups are also referred to as REG bundles. The number of REGs that make up one REG group is called Bundle @ size. For example, the Bundle size of the REG may be any one of 1, 2, 3, and 6. In interleaved @ mapping, an interleaver may be applied for each REG bundle. The terminal device 1 may assume that the same precoder is applied to the REs in the REG group. The terminal device 1 can perform channel estimation on the assumption that the precoder applied to the REs in the REG group is the same. On the other hand, the terminal device 1 may assume that the precoders applied to the REs between the REG groups are not the same. In other words, the terminal device 1 does not need to assume that the precoder applied to the REs between the REG groups is the same. “Between REG groups” may be paraphrased as “between two different REG groups”. The terminal device 1 can perform channel estimation on the assumption that precoders applied to REs between REG groups are not the same. Details of the REG group will be described later.

The number of CCEs constituting a PDCCH candidate is also referred to as an aggregation level (AL: Aggregation Level). When one PDCCH candidate is configured by aggregation of a plurality of CCEs, one PDCCH candidate is configured by a plurality of CCEs with consecutive CCE numbers. Aggregation level set of PDCCH candidates of AL _X is referred to as the search area of the aggregation level AL _X. That is, the search area of the aggregation level AL _X is aggregation level may be configured to include one or more PDCCH candidates of AL _X. Also, the search area may include PDCCH candidates at a plurality of aggregation levels. For example, the CSS may include multiple aggregation level PDCCH candidates. For example, the USS may include multiple aggregation level PDCCH candidates. A set of aggregation levels of PDCCH candidates included in the CSS and a set of aggregation levels of PDCCH candidates included in the USS may be defined / set respectively.

グ ル ー プ The REG group will be described below.

The REG group may be used for channel estimation in the terminal device 1. For example, the terminal device 1 performs channel estimation for each REG group. This is based on the difficulty of performing channel estimation (eg, MMSE channel estimation, etc.) at the RE for reference signals to which different precoders are applied. Here, MMSE is an abbreviation for Minimum \ Mean \ Square \ Error.

精度 The accuracy of channel estimation varies at least based on the power allocated to the reference signal, the density of the RE used for the reference signal in the time frequency domain, the environment of the radio channel, and the like. The accuracy of the channel estimation varies based at least on the time-frequency domain used for the channel estimation. In various aspects of the present embodiment, the REG group may be used as a parameter for setting a time-frequency region used for channel estimation.

That is, the larger the REG group, the higher the gain of channel estimation accuracy. On the other hand, a small REG group means that one PDCCH candidate includes many REG groups. The fact that one REGCH group is included in one PDCCH candidate means that a transmission method (a precoder rotation, a precoder cycling, and the like) that acquires spatial diversity by applying a precoder individually to each REG group. ).

One REG group may be composed of REGs that are continuous or close in the time domain and / or the frequency domain.

A group of REGs in the time domain is suitable for improving channel estimation accuracy and / or reducing reference signals. For example, the number of REGs forming the REG group in the time domain may be one, two, three, or another value. Further, the number of REGs forming the REG group in the time domain may be given based at least on the number of OFDM symbols included in the control resource set. Further, the number of REGs forming the REG group in the time domain may be the same as the number of OFDM symbols included in the control resource set.

The group of REGs in the frequency domain contributes to an improvement in channel estimation accuracy. For example, the number of REGs forming a group of REGs in the frequency domain may be two, three, or a multiple of at least two, or a multiple of at least three. Is also good. Further, the number of REGs forming the REG group in the frequency domain may be given based at least on the number of PRBs of the control resource set. Further, the number of REGs forming the REG group in the frequency domain may be the same as the number of PRBs included in the control resource set.

FIG. 8 is a diagram illustrating an example of REGs configuring PDCCH candidates and the number of REGs configuring REG groups according to an aspect of the present embodiment. In the example shown in FIG. 8A, PDCCH candidates are mapped to one OFDM symbol, and three REG groups (REG @ group) including two REGs are configured. That is, in the example shown in FIG. 8A, one REG group is composed of two REGs. The number of REGs forming 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 illustrated in FIG. 8A, the number of REGs forming a group of REGs in the frequency domain may be 1, 2, 3, or 6.

一 In the example shown in FIG. 8B, PDCCH candidates are mapped to two OFDM symbols, and three REG groups including two REGs are configured. In the example illustrated in FIG. 8B, the number of REGs forming a group of REGs in the frequency domain may be either one or three.

数 The number of REGs forming a group of REGs in the frequency domain may be given based at least on the number of OFDM symbols to which PDCCH candidates are mapped. The number of REGs forming the REG group in the frequency domain may be individually set for the number of OFDM symbols to which PDCCH candidates are mapped. The number of REGs configuring the REG group in the frequency domain may be given based at least on a mapping method (mapping type) of the REGs configuring the CCE. The number of REGs constituting the REG group in the frequency domain may be individually set for the mapping method of the REGs constituting the CCE. The method of mapping the REGs constituting the CCE may be either interleaved @ mapping or non-interleaved @ mapping. The mapping method of the REGs constituting the CCE may be either a continuous mapping method (Localized @ transmission) or a discontinuous mapping method (Distributed @ transmission). The number of REGs forming a group of REGs in the frequency domain may be given based at least on the number of OFDM symbols to which one CCE is mapped. The number of REGs forming a group of REGs in the frequency domain may be set individually for the number of OFDM symbols to which one CCE is mapped.

数 The number of REGs forming a group of REGs in the time domain may be given based at least on the number of OFDM symbols to which PDCCH candidates are mapped. The number of REGs forming the REG group in the time domain may be individually set for the number of OFDM symbols to which PDCCH candidates are mapped. The number of REGs forming a group of REGs in the time domain may be given based at least on the number of OFDM symbols to which one CCE is mapped. The number of REGs forming a group of REGs in the time domain may be set individually for the number of OFDM symbols to which one CCE is mapped.

The REG group in the time domain is also suitable for reducing reference signals. When the REG group is configured as illustrated in FIG. 8B, the reference signal may be included in a front OFDM symbol and / or a rear OFDM symbol. For example, in the time domain, the first REG (leading REG) in the REG group may include a RE to which no downlink control information is mapped, and REGs other than the first REG in the REG group may have the downlink control information. It may not include REs that are not mapped.

FIG. 9 is a diagram illustrating an example of mapping of REGs configuring a CCE according to an aspect of the present embodiment. Here, a case where the number of OFDM symbols constituting the control resource set is three is shown. In FIG. 9, one CCE is composed of six REGs. Further, in FIG. 9, the index m of the REG in the time domain is given a value of m = 0 to 2 (0, 1, 2) from the left. Also, in FIG. 9, the index n of the REG in the frequency domain is given a value of n = 0 to 5 (0, 1, 2, 3, 4, 5) from the bottom. FIG. 9A shows an example in which REGs constituting a CCE are mapped to Time @ first. The Time @ first mapping maps the REG from the low (small) index of the REG in the time domain to the high (large) index of the REG, and changes the index of the REG in the frequency domain when the index of the REG in the time domain reaches the maximum. This is a mapping method in which one is added. FIG. 9B shows an example in which the REGs constituting the CCE are mapped to Frequency @ first. The mapping of Frequency @ first maps the REG from the lower (small) index to the higher (large) index of the REG in the frequency domain, and changes the index of the REG in the time domain when the index of the REG in the frequency domain reaches the maximum. This is a mapping method in which one is added. Here, to map the REG means to map the signal arranged in the REG.

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

FIG. 10 is a schematic block diagram showing the configuration of the terminal device 1 of the present embodiment. As illustrated, the terminal device 1 is configured to include a wireless transmission / reception unit 10 and an upper layer processing unit 14. The wireless transmission / reception unit 10 includes an antenna unit 11, an RF (Radio @ Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 includes a medium access control layer processing unit 15 and a radio resource control layer processing unit 16. The wireless transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit. The physical layer processing unit includes a decoding unit. 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 the blind decoding process on the received signal of the resource corresponding to the USS PDCCH candidate. The decoding unit of the terminal device 1 performs a brand decoding process on the received signal of the resource corresponding to the PDCCH candidate of the CSS. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set. The reception processing unit of the terminal device 1 monitors a PDCCH candidate used for the PDCCH including the CC-RNTI. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the first control resource set and the second control resource set. The first control resource set includes OFDM symbols in the first half of a slot. The second control resource set includes OFDM symbols in the latter half of the slot. The reception processing unit of the terminal device 1 monitors the first number of PDCCH candidates in the second control resource set in the slot (first slot) where it is determined that the base station device 3 is transmitting a signal. . The reception processing unit of the terminal device 1 transmits the second number of PDCCHs in the first control resource set in the next slot (second slot) of the slot determined that the base station device 3 is transmitting a signal. Monitor candidates. The reception processing unit of the terminal device 1 monitors a third number of PDCCH candidates in the first control resource set in a subsequent slot (third slot). A value obtained by subtracting the first number from the third number may be equal to the second number. The second number may be smaller than a value obtained by subtracting the first number from the third number. The second number may be determined based on the third number and the first number.

(4) The upper layer processing unit 14 outputs the uplink data (transport block) generated by a user operation or the like to the wireless transmission / reception unit 10. The upper layer processing unit 14 performs processing of a MAC layer, a packet data integration protocol (PDCP: Packet Data Convergence Protocol) layer, a radio link control (RLC: Radio Link Control) layer, and an RRC layer.

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

(4) The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the RRC layer. The radio resource control layer processing unit 16 manages various setting information / parameters of the 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 various setting information / parameters received from the base station device 3.

The radio resource control layer processing unit 16 sets a control resource set based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a first control resource set and a second control resource set based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets an OFDM symbol constituting the first control resource set based on the RRC signaling received from the base station device. The radio resource control layer processing unit 16 sets an OFDM symbol constituting the first control resource set to an OFDM symbol in the first half of the slot. The radio resource control layer processing unit 16 sets an OFDM symbol constituting the second control resource set based on the RRC signaling received from the base station device. The radio resource control layer processing unit 16 sets the OFDM symbols constituting the second control resource set to the latter half of the slot.

The radio resource control layer processing unit 16 sets a value based on RRC signaling for the number of PDCCH candidates monitored in the first control resource set. The radio resource control layer processing unit 16 sets a value based on RRC signaling for the number of PDCCH candidates monitored in the second control resource set. The reception processing unit of the terminal device 1 determines the number set by the radio resource control layer processing unit 16 in the second control resource set in the first slot in which it is determined that the base station device 3 is transmitting a signal ( (First number) of PDCCH candidates are monitored. The reception processing unit of the terminal device 1 monitors the number (third number) of PDCCH candidates set by the radio resource control layer processing unit 16 in the first control resource set in the third slot. The reception processing unit of the terminal device 1 monitors the second number of PDCCH candidates in the first control resource set in the second slot. The second number is a value obtained by subtracting the first number from the third number. Further, the second number may be a value smaller than a value obtained by subtracting the first number from the third number. The second number may be a value obtained by equally dividing the third number based on the number of a plurality of control resource sets within a predetermined time. The second number may be determined based on the third number and the first number. The second number may be obtained by calculating the third number based on the number of a plurality of control resource sets within a predetermined time.

When the PDCCH candidate in the first control resource set is monitored in the first slot, the reception processing unit of the terminal device 1 does not monitor the PDCCH candidate in the second control resource set in the first slot. When monitoring the PDCCH candidates in the first control resource set in the first slot, the reception processing unit of the terminal device 1 sets the number set by the radio resource control layer processing unit 16 in the first control resource set. The (third number) PDCCH candidates are monitored. The reception processing unit of the terminal device 1 monitors the PDCCH candidate in the first control resource set in the first slot, and if the PDCCH candidate is not monitored in the second control resource set in the first slot, In the first slot, the number (third number) of PDCCH candidates set by the radio resource control layer processing unit 16 in the first control resource set is monitored.

The wireless transmission / reception unit 10 performs physical layer processing such as modulation, demodulation, encoding, and decoding. The wireless transmission / reception unit 10 separates, demodulates, and decodes the signal received from the base station device 3 and outputs the decoded information to the upper layer processing unit 14. The wireless transmission / reception unit 10 generates a transmission signal by modulating and encoding data, and transmits the transmission signal to the base station device 3.

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

The baseband unit 13 converts an analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to CP (Cyclic Prefix) from the converted digital signal, performs a fast Fourier transform (FFT: Fast Fourier Transform) on the signal from which the CP has been removed, and converts the signal in the frequency domain. Extract.

The baseband unit 13 performs an inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) on the data, generates an OFDM symbol, adds a CP to the generated OFDM symbol, generates a baseband digital signal, and generates a baseband digital signal. The band digital signal is converted into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

The RF unit 12 removes an extra frequency component from the analog signal input from the baseband unit 13 using a low-pass filter, up-converts the analog signal to a carrier frequency (up convert), and transmits the analog signal via the antenna unit 11. I do. Further, the RF unit 12 amplifies the power. Further, the RF unit 12 may have a function of controlling transmission power. The RF unit 12 is also called a transmission power control unit.

The terminal device 1 receives the PDCCH. 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 control resource set (first control resource set, second control resource set) based on RRC signaling. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates in the set control resource set. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates in the first control resource set set in a certain slot. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates in the second control resource set set in a certain slot. The decoding unit of the terminal device 1 decodes the monitored PDCCH candidate. The radio resource control layer processing unit 16 sets the first control resource set in the first half OFDM symbol of the slot. The radio resource control layer processing unit 16 sets the second control resource set in the OFDM symbol in the latter half of the slot.

受 信 The reception unit of the terminal device 1 monitors the number (third number) of PDCCH candidates set based on RRC signaling in the first control resource set in a certain slot. The receiving unit of the terminal device 1 monitors the number (second number) of PDCCH candidates set based on RRC signaling in the second control resource set in a certain slot. The receiving unit of the terminal device 1 monitors the number (second number) of PDCCH candidates calculated in the first control resource set in a certain slot. The receiving unit of the terminal device 1 monitors the first number of PDCCH candidates in the second control resource set in the first slot where it is determined that the base station device is transmitting a signal. The receiving unit of the terminal device 1 monitors a second number of PDCCH candidates in the first control resource set in a second slot that is a slot next to the first slot. The receiving unit of the terminal device 1 monitors a third number of PDCCH candidates in the first control resource set in a third slot that is a slot next to the second slot. The second number is a value obtained by subtracting the first number from the third number. Further, the second number may be a value smaller than a value obtained by subtracting the first number from the third number. The second number may be a value obtained by equally dividing the third number based on the number of a plurality of control resource sets within a predetermined time. The second number may be determined based on the third number and the first number. The second number may be obtained by calculating the third number based on the number of a plurality of control resource sets within a predetermined time.

When monitoring the PDCCH candidate in the first control resource set in the first slot, the receiving unit of the terminal device 1 does not need to monitor the PDCCH candidate in the second control resource set in the first slot. Good. When monitoring the PDCCH candidates in the first control resource set in the first slot, the reception processing unit of the terminal device 1 sets the number set by the radio resource control layer processing unit 16 in the first control resource set. (Third number) PDCCH candidates may be monitored. The reception processing unit of the terminal device 1 monitors the PDCCH candidate in the first control resource set in the first slot, and if the PDCCH candidate is not monitored in the second control resource set in the first slot, In the first slot, the number (third number) of PDCCH candidates set by the radio resource control layer processing unit 16 in the first control resource set may be monitored.

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

FIG. 11 is a schematic block diagram illustrating the configuration of the base station device 3 of the present embodiment. As illustrated, the base station device 3 is configured to include a radio transmission / reception unit 30 and an upper layer processing unit 34. The wireless transmission / reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The wireless transmission / reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

(4) The upper layer processing unit 34 performs processing of the MAC layer, PDCP layer, RLC layer, and RRC layer.

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

(4) The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs processing of the RRC layer. The radio resource control layer processing unit 36 generates downlink data (transport block), system information, RRC message (RRC signaling), MAC @ CE, and the like arranged on the PDSCH, or obtains the information from an upper node, and obtains the radio transmission / reception unit. Output to 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 of the terminal devices 1 via a signal of an upper layer. That is, the radio resource control layer processing unit 36 transmits / reports information indicating various setting information / parameters.

The radio resource control layer processing unit 36 sets a control resource set for the terminal device 1. The radio resource control layer processing unit 36 sets a first control resource set and a second control resource set for the terminal device 1. A plurality of PDCCH candidates are configured in the set control resource set. A plurality of PDCCH candidates are configured in the first control resource set set in a certain slot. A plurality of PDCCH candidates are configured in the second control resource set set in a certain slot. The radio resource control layer processing unit 36 sets the first control resource set in the first half OFDM symbol of the slot. The radio resource control layer processing unit 36 sets the second control resource set in the latter part of the slot.

に お い て In a certain slot, a third number of PDCCH candidates are configured in the first control resource set. In a certain slot, a second number of PDCCH candidates are configured in the second control resource set. In a certain slot, a second number of PDCCH candidates are configured in the first control resource set. The first number of PDCCH candidates is configured in the second control resource set in the first slot in which signal transmission to the terminal device 1 is first started after the Listen-Before-Talk in the base station device 3. . A second number of PDCCH candidates is configured in the first control resource set in a second slot that is a slot next to the first slot. A third number of PDCCH candidates is configured in the first control resource set by a third slot that is a slot next to the second slot. The second number is a value obtained by subtracting the first number from the third number. Further, the second number may be a value smaller than a value obtained by subtracting the first number from the third number. The second number may be a value obtained by equally dividing the third number based on the number of a plurality of control resource sets within a predetermined time. The second number may be determined based on the third number and the first number. The second number may be obtained by calculating the third number based on the number of a plurality of control resource sets within a predetermined time.

When the PDCCH candidate in the first control resource set is configured in the first slot for the terminal device 1, the base station device 3 sets the second control resource set in the first slot for the terminal device 1. It is not necessary to configure the PDCCH candidates in. When configuring a PDCCH candidate in the first control resource set for the terminal device 1 in the first slot, the base station apparatus 3 configures a third number of PDCCH candidates in the first control resource set. May be. The base station apparatus 3 configures a PDCCH candidate in the first control resource set in the first slot for the terminal apparatus 1 and does not configure a PDCCH candidate in the second control resource set in the first slot. Alternatively, a third number of PDCCH candidates may be configured in the first control resource set in the second slot for the terminal device 1.

機能 The function of the wireless transmitting and receiving unit 30 has the same function as that of the wireless transmitting and receiving unit 10. In addition, the wireless transmission / reception unit 30 grasps an SS (Search @ space: search area) configured in the terminal device 1. The wireless transmission / reception unit 30 recognizes a search area in the first control resource set included in the terminal device 1 and a search area in the second control resource set included in the terminal device 1. The radio transmitting / receiving unit 30 grasps a PDCCH candidate monitored by the terminal device 1 and grasps a search area. The radio transmitting / receiving unit 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (which grasps the number of the control channel element in which the PDCCH candidate is composed). The wireless transmission / reception unit 30 includes an SS grasping unit, and the SS grasping unit grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates in the control resource set configured as Search @ space of the terminal device. The SS grasping unit grasps PDCCH candidates (the number of PDCCH candidates and the number of PDCCH candidates) configured in the search area in the first control resource set and the second control resource set of the terminal device 1.

The SS grasping unit is configured to search in the second control resource set for a first slot, which is a slot from which signal transmission is first started to the terminal device 1 after the Listen-Before-Talk by the base station device 3. , The first number of PDCCH candidates is configured. The SS grasping unit grasps that the second number of PDCCH candidates is configured in the search area in the first control resource set for the second slot which is the next slot of the first slot. The SS grasping unit grasps that a third number of PDCCH candidates are configured in a search area in the first control resource set for a third slot which is a slot next to the second slot. The transmission unit of the radio transmission / reception unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidate in the first control resource set or the second control resource set.

When a PDCCH candidate in the first control resource set is configured in the first slot for the terminal device 1, the SS grasping unit configures a third number of PDCCH candidates in the first control resource set. You may know that it is done. When the PDCCH candidate in the first control resource set is configured in the first slot for the terminal device 1, the SS grasping unit determines the second control resource set in the first slot for the terminal device 1. May be grasped that no PDCCH candidate is configured. When the PDCCH candidate in the first control resource set is configured in the first slot for the terminal device 1 and the PDCCH candidate is not configured in the second control resource set in the first slot, The terminal device 1 may recognize that a third number of PDCCH candidates are configured in the first control resource set in the second slot.

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

Hereinafter, an example of an initial connection procedure according to the present embodiment will be described.

The base station device 3 has a communicable range (or communication area) controlled by the base station device 3. The communicable range is divided into one or more cells (or serving cells, subcells, beams, and the like), and communication with the terminal device 1 can be managed for each cell. On the other hand, the terminal device 1 selects at least one cell from a plurality of cells and attempts to establish a connection with the base station device 3. Here, the first state in which the connection between the terminal device 1 and at least one cell of the base station device 3 is established is also referred to as an RRC connection (RRC Connection). The second state in which the terminal device 1 has not established a connection with any cell of the base station device 3 is also referred to as RRC idle. Further, the third state in which the connection between the terminal device 1 and at least one cell of the base station device 3 is established, but some functions are limited between the terminal device 1 and the base station device 3 Also called RRC suspended (RRC @ suspended). RRC suspension is also referred to as RRC inactive.

The terminal device 1 of the RRC idle may try to establish a connection with at least one cell of the base station device 3. Here, the cell to which the terminal device 1 attempts to connect is also called a target cell. FIG. 12 is a diagram illustrating an example of a first initial connection procedure (4-step contention based RACH procedure) according to an aspect of the present embodiment. The first initial connection procedure includes at least a part of steps 5101 to 5104.

Step 5101 is a step in which the terminal device 1 requests a response for initial connection to the target cell via a physical channel. Alternatively, step 5101 is a step in which the terminal device 1 performs the first transmission to the target cell via the physical channel. Here, the physical channel may be, for example, a PRACH. The physical channel may be a channel exclusively used to request a response for an initial connection. The message transmitted from the terminal device 1 via the physical channel in Step 5101 is also referred to as a random access message 1. The signal of the random access message 1 may be generated based on a random access preamble index u given from an upper layer of the terminal device 1.

(4) Prior to the execution of step 5101, the terminal device 1 performs downlink time-frequency synchronization. In the first state, a synchronization signal is used for the terminal device 1 to perform downlink time-frequency synchronization.

The synchronization signal may be transmitted including the ID of the target cell (cell ID). The synchronization signal may be transmitted including a sequence generated based at least on the cell ID. The fact that the synchronization signal includes the cell ID may mean that a sequence of the synchronization signal is given based on the cell ID. The synchronization signal may be transmitted by applying a beam (or a precoder).

The beam shows a phenomenon that the antenna gain varies depending on the direction. The beam may be provided based at least on the directivity of the antenna. Also, the beam may be provided at least based on a phase conversion of the carrier signal. Also, the beam may be provided by applying a precoder.

The terminal device 1 receives the PBCH transmitted from the target cell. The PBCH may be transmitted including an important information block (MIB: Master Information Block, EIB: Essential Information Block) containing important system information used for connecting the terminal device 1 to the target cell. The important information block is system information. The important information block may include information on the number of the radio frame. The important information block may include information on a position in a superframe including a plurality of radio frames (for example, information indicating at least a part of a system frame number (SFN: System \ Frame \ Number) in the superframe). Further, the PBCH may include an index of a synchronization signal. The PBCH may include information related to receiving the PDCCH. The important information block may be mapped to the BCH in the transport channel. The important information block may be mapped to the BCCH in the logical channel.

情報 The information related to the reception of the PDCCH may include information indicating a control resource set. The information indicating the control resource set may include information on the number and location of PRBs to which the control resource set is mapped. The information indicating the control resource set may include information indicating the mapping of the control resource set. The information indicating the control resource set may include information related to the number of OFDM symbols to which the control resource set is mapped. The information indicating the control resource set may include information indicating a period (periodicity) of a slot to which the control resource set is mapped. The information indicating the control resource set may include information indicating a position in a time domain of a subframe or a slot in which the control resource set is arranged. The terminal device 1 can attempt to receive the PDCCH based at least on the information indicating the control resource set included in the PBCH.

情報 The information related to the reception of the PDCCH may include information related to the ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling a CRC bit added to the PDCCH. The ID indicating the destination of the PDCCH is also called RNTI (Radio Network Temporary Identifier). The information related to the reception of the PDCCH may include information related to an ID used for scrambling a CRC bit 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.

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

A common control resource set in which a PDSCH including PDSCH resource allocation information used for transmission and reception of system information (RMSI: Reminding Minimum System Information, OSI: Other System Information) may be arranged in association with a synchronization signal. . The common control resource set may be arranged in a subframe that is the same as or close to the time domain in which the synchronization signal is arranged.

情報 The information related to the reception of the PDCCH may include information on the aggregation level of the search area included in the control resource set. The terminal device 1 can specify the aggregation level of the PDCCH candidate to be received and determine the search area based on at least the information on the aggregation level of the search area included in the control resource set included in the PBCH. The information related to PDCCH reception may include information on the number of PDCCH candidates in the search area. Information related to PDCCH reception may include information on the number of PDCCH candidates for each aggregation level of the search area.

情報 The information related to the reception of the PDCCH may include information (REG bundle size) related to the REG group. The information related to the reception of the PDCCH may include information indicating the number of REGs forming the REG group in the frequency domain. The information related to the reception of the PDCCH may include information indicating the number of REGs forming a group of REGs in the time domain.

参照 The reference signal corresponding to the control resource set may correspond to a plurality of PDCCH candidates included in the control resource set. The reference signal corresponding to the control resource set may be used for demodulation of a plurality of PDCCHs included in the control resource set.

The base station device 3 can transmit a PBCH including information related to the reception of the PDCCH and instruct the terminal device 1 to monitor the common control resource set. The terminal device 1 performs monitoring of the common control resource set based at least on detecting information related to the reception of the PDCCH included in the PBCH. The common control resource set is used at least for scheduling of the first system information (RMSI, OSI). The first system information may include important system information for the terminal device 1 to connect to the target cell. The first system information may include information on various downlink settings. The first system information may include information on various settings of the PRACH. The first system information may include information on various uplink settings. The first system information may include signal waveform information (OFDM or DFT-s-OFDM) set for random access message 3 transmission. The first system information may include at least a part of the system information other than the information included in the MIB.

The first system information may be mapped to a BCH in a transport channel. The first system information may be mapped to a BCCH in a logical channel. The first system information may include at least SIB1 (System \ Information \ Block \ type1). The first system information may include at least SIB2 (System \ Information \ Block \ type2). The common control resource set may be used for scheduling the random access message 2. Note that SIB1 may include information related to measurement necessary for making an RRC connection. In addition, the SIB 2 may include information on a channel that is common and / or shared between a plurality of terminal devices 1 in a cell. The MIB may include information indicating a frequency resource forming Bandwidth @ part. The system information SIB (SIB1) may include information indicating a frequency resource constituting Bandwidth @ part.

The terminal device 1 may monitor the PDCCH based at least on information related to the reception of the PDCCH. The terminal device 1 may monitor the PDCCH based at least on information related to the REG group. The terminal device 1 may assume a setting applied for monitoring the PDCCH based at least on information related to the reception of the PDCCH.

The base station device 3 can transmit MIB and / or first system information and instruct the terminal device 1 to monitor the common control resource set. The first system information may include information related to the reception of the PDCCH. The terminal device 1 may monitor the common control resource set based at least on the information related to the reception of the PDCCH included in the MIB and / or the first system information. The common control resource set may be used to schedule a PDSCH including paging information and / or information for a change notification of system information.

Step 5102 is a step in which the base station apparatus 3 makes a response to the random access message 1 to the terminal apparatus 1. The response is also called a random access message 2. Random access message 2 may be sent via PDSCH. The PDSCH including the random access message 2 is scheduled by the PDCCH. CRC bits included in the PDCCH may be scrambled by RA-RNTI. The random access message 2 may be transmitted including a special uplink grant. The special uplink grant is also called a random access response grant. The special uplink grant may be included in the PDSCH including the random access message 2. The random access response grant may include at least Temporary @ C-RNTI.

The base station device 3 can transmit the MIB, the first system information, and / or the second system information, and can instruct the terminal device 1 to monitor the common control resource set. The second system information may include information related to receiving the PDCCH. The terminal device 1 monitors the common control resource set based at least on information related to the reception of the PDCCH included in the MIB, the first system information, and / or the second system information. CRC bits added to the PDCCH may be scrambled by Temporary @ C-RNTI. The common control resource set may be used for scheduling the random access message 2.

The common control resource set is further based on at least the physical route index u included in the random access message 1 transmitted from the terminal device 1 and / or the resources (PRACH resources) used for transmitting the random access message 1. May be given. Here, the random access message 1 may correspond to monitoring of a control resource set. Also, the resource may indicate a time and / or frequency resource. The resource may be given by a resource block index and / or a slot (subframe) index. Monitoring of the common control resource set may be triggered by the random access message 1.

Step 5103 is a step in which the terminal device 1 transmits an RRC connection request to the target cell. The request for the RRC connection is also called a random access message 3. The random access message 3 may be transmitted via the PUSCH scheduled by the random access response grant. The random access message 3 may include an ID used for identifying the terminal device 1. The ID may be an ID managed by an upper layer. The ID may be S-TMSI (SAE Temporary Mobile Mobile Subscriber Identity). The ID may be mapped to the CCCH in a logical channel.

Step 5104 is a step in which the base station device 3 transmits a collision resolution message to the terminal device 1. The collision resolution message is also called a random access message 4. After transmitting the random access message 3, the terminal device 1 monitors the PDCCH for scheduling the PDSCH including the random access message 4. The random access message 4 may include a collision avoidance ID. Here, the collision avoidance ID is used to resolve a collision in which a plurality of terminal devices 1 transmit signals using the same radio resource. The collision avoidance ID is also called UE \ contention \ resolution \ identity.

In step 5104, the terminal device 1 that has transmitted the random access message 3 including the ID (for example, S-TMSI) used for identifying the terminal device 1 monitors the random access message 4 including the collision resolution message. If the collision avoidance ID included in the random access message 4 is equal to the ID used to identify the terminal device 1, the terminal device 1 considers that the collision resolution has been completed successfully, and May be set to the value of Temporary @ C-RNTI. The terminal device 1 in which the value of Temporary @ C-RNTI is set in the C-RNTI field is regarded as having completed the RRC connection.

The control resource set for monitoring the PDCCH for scheduling the random access message 4 may be a common control resource set. The base station apparatus 3 can transmit the information related to the reception of the PDCCH in the random access message 2 and instruct the terminal apparatus 1 to monitor the common control resource set. The terminal device 1 monitors the PDCCH based at least on information related to the reception of the PDCCH included in the random access message 2.

端末 The terminal device 1 connected to the RRC can receive dedicated RRC signaling mapped to the DCCH in the logical channel. The base station device 3 can transmit dedicated RRC signaling including information related to the reception of the PDCCH, and instruct the terminal device 1 to monitor the dedicated control resource set. The terminal device 1 performs monitoring of the PDCCH based at least on information related to the reception of the PDCCH included in the dedicated RRC signaling. Further, the base station device 3 can transmit dedicated RRC signaling including information related to the reception of the PDCCH, and can instruct the terminal device 1 to monitor the common control resource set. The terminal device 1 monitors the PDCCH including the CC-RNTI in the common control resource set.

The base station device 3 can transmit the random access message 4 including information related to the reception of the PDCCH, and instruct the terminal device 1 to monitor the dedicated control resource set. When information related to the reception of the PDCCH is included in the random access message 4, the terminal device 1 may monitor the dedicated control resource set based at least on the information related to the reception of the PDCCH.

The common control resource set may include not only one type but also a plurality of types. Depending on the application, a plurality of common control resource sets may be independently configured. For example, a common control resource set for transmitting and receiving PDCCH including CC-RNTI and a common control resource set for transmitting and receiving PDCCH including SI-RNTI may be configured independently. Each of the plurality of common control resource sets may be configured in a different LBT @ subband.

FIG. 13 is a diagram illustrating an example of a first control resource set and a second control resource set set in the terminal device 1 according to an 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 first (l = 0) to seventh (l = 6) OFDM symbols are the first half OFDM symbols of the slot, and the eighth (l = 7) to fourteenth (l = 13) OFDM symbols. The symbol is an OFDM symbol in the first half of the slot. In FIG. 13, the first control resource set is composed of the first (l = 0) OFDM symbol of the slot, and the second control resource set is composed of the eighth (l = 7) OFDM symbol of the slot. .

FIG. 14 is a diagram illustrating an example of a first control resource set and a second control resource set set in the terminal device 1 according to an aspect of the present embodiment. In FIG. 14, 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. 14, the first (l = 0) to seventh (l = 6) OFDM symbols are the first part of the slot, and the eighth (l = 7) to fourteenth (l = 13) OFDM symbols. The symbol is an OFDM symbol in the first half of the slot. In FIG. 14, the first control resource set is composed of the second (l = 1) OFDM symbol of the slot, and the second control resource set is composed of the eleventh (l = 10) OFDM symbol of the slot. . The first control resource set may be composed of OFDM symbols other than the first OFDM symbol in the first half of the slot. The second control resource set may be composed of OFDM symbols other than the first OFDM symbol in the latter half of the slot.

FIG. 15 is a diagram illustrating an example of a first control resource set and a second control resource set set in the terminal device 1 according to an 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 first (l = 0) to seventh (l = 6) OFDM symbols are the first half OFDM symbols of the slot, and the eighth (l = 7) to fourteenth (l = 13) OFDM symbols. The symbol is an OFDM symbol in the first half of the slot. In FIG. 15, the first control resource set is composed of the first (l = 0), second (l = 1), and third (l = 2) OFDM symbols of the slot, and the second control resource set is It is composed of the ninth (l = 8) and tenth (l = 9) OFDM symbols of the slot. The first control resource set may consist of one or more OFDM symbols. The second control resource set may be composed of one or a plurality of OFDM symbols.

13, 14, and 15, a plurality of OFDM symbols in a slot are divided into halves, and OFDM symbols earlier than half in the time domain are OFDM symbols in the first half of the slot, and OFDM symbols later than half in the time domain. Is the OFDM symbol in the latter half of the slot, but the half of the slot may not be a boundary. For example, the first (l = 0) to the ninth (l = 8) (OFDM symbols after the half) OFDM symbols are set as the first half OFDM symbols, and the tenth (l = 9) to the fourteenth (l = 13) are used. ) May be used as the latter half of the OFDM symbol.

FIG. 16 is a diagram illustrating an example of PDCCH candidates monitored by the terminal device 1 according to an aspect of the present embodiment. In FIG. 16, a slot is composed of 14 OFDM symbols, a first control resource set is composed of first to second OFDM symbols, and a second control resource set is composed of eighth to ninth OFDM symbols. Be composed. The LBT section (idle section) extends to the sixth OFDM symbol section in slot 1, and the base station device 3 does not transmit any signal. After the LBT of the base station apparatus 3, the base station apparatus 3 starts a signal from the seventh OFDM symbol in slot 1 and occupies the channel until the seventh OFDM symbol in slot 5 (4 ms). (Channel occupancy section) (Channel \ Occupancy \ Time). In the seventh OFDM symbol of slot 1, base station apparatus 3 transmits a signal that allows terminal apparatus 1 to detect that base station apparatus 3 has started access (started signal transmission). The terminal device 1 performs a detection process of a signal transmitted by the base station device 3 at the start of access at any time. Then, it detects (recognizes and judges) that the base station device 3 has started access.

In slot 0, which is an LBT section, the terminal device 1 does not monitor PDCCH candidates in the search area of the first control resource set. In slot 0, which is an LBT section, the terminal device 1 does not monitor PDCCH candidates in the search region for the second control resource set. In slot 1 of the partial LBT section, terminal apparatus 1 does not monitor PDCCH candidates in the search area for the first control resource set. In slot 1 (first slot) of a part of the LBT section, the terminal device 1 searches for the first number of PDCCH candidates in the search area of the second control resource set after the timing at which the base station device 3 starts accessing. Monitor. Slot 1 is a slot (first slot) for which it is determined that the base station device 3 is transmitting a signal. The base station device 3 transmits the PDCCH to the terminal device 1 using the PDCCH candidate of the second control resource set of the slot 1. The terminal device 1 detects the PDCCH in the search area for the second control resource set in the slot 1.

In the slot 2 (second slot) next to the slot in which the base station apparatus 3 has determined that the base station apparatus 3 is transmitting a signal, the terminal apparatus 1 searches for the second number of PDCCH candidates in the search area of the first control resource set. Monitor In slot 2, the terminal device 1 does not monitor PDCCH candidates in the search area for the second control resource set. In slot 2, the number of PDCCH candidates in the search area of the second control resource set is zero. In slot 2, the terminal device 1 need not set the PDCCH search area in the second control resource set. The terminal device 1 monitors a third number of PDCCH candidates in a search area for the first control resource set in a slot 3 (third slot) next to the slot 2, and uses a PDCCH candidate in the second control resource set. Do not monitor Similarly, in slot 4, terminal apparatus 1 monitors a third number of PDCCH candidates in the search area for the first control resource set, and does not monitor PDCCH candidates in the second control resource set. Similarly, in slot 5, terminal apparatus 1 monitors a third number of PDCCH candidates in the search area for the first control resource set, and does not monitor PDCCH candidates in the second control resource set.

In the slot after slot 5, the LBT section (idle section) is restarted, and the terminal device 1 monitors the PDCCH candidates in the search region of the first control resource set until it determines that the base station device 3 is transmitting a signal. No PDCCH candidate is not monitored in the search area of the second control resource set. A section from the seventh OFDM symbol in slot 1 to the sixth OFDM symbol in slot 5 may be referred to as a channel occupation section (busy section).

に お い て In FIG. 16, the second number is a value obtained by subtracting the first number from the third number. Further, the second number may be a value smaller than a value obtained by subtracting the first number from the third number. The second number may be a value obtained by equally dividing the third number based on the number of a plurality of control resource sets within a predetermined time. The second number may be determined based on the third number and the first number. The second number may be obtained by calculating the third number based on the number of a plurality of control resource sets within a predetermined time. For example, the third number is 44, the first number is 22, and the second number is 22. When 22 (first number) is subtracted from 44 (third number), it is 22 (second number). When 44 (third number) is equally distributed to two control resource sets in one slot (1 ms), each of the second number and the first number is 22. Further, the second number may be a value smaller than 22, for example, 20.

In FIG. 16, the case where the section where the channel is continuously occupied (channel occupation section) (Channel \ Occupancy \ Time) is 4 ms has been described, but the channel occupation section may have a different value. The value of the channel occupied section may be determined in advance by the country, or may be determined in advance for each frequency band. The base station device 3 may notify the terminal device 1 of the channel occupied section. The terminal device 1 recognizes the length of the channel occupied section and can grasp the timing at which the channel occupied section ends.

FIG. 17 is a diagram illustrating an example of a PDCCH candidate monitored by the terminal device 1 according to an aspect of the present embodiment. In FIG. 17, a slot is composed of 14 OFDM symbols, a first control resource set is composed of first to second OFDM symbols, and a second control resource set is composed of eighth to ninth OFDM symbols. Be composed. The LBT section (idle section) extends to the 14th OFDM symbol section in slot 0, and the base station apparatus 3 does not transmit (do not access) a signal. After the LBT of the base station apparatus 3, the base station apparatus 3 starts a signal from the first OFDM symbol in slot 1 and occupies the channel until the fourteenth OFDM symbol in slot 4 (4 ms). (Channel occupation section). In the first OFDM symbol of slot 1, base station apparatus 3 transmits a signal that allows terminal apparatus 1 to detect that base station apparatus 3 has started access (started signal transmission). The terminal device 1 performs a detection process of a signal transmitted by the base station device 3 at the start of access at any time, and detects a signal transmitted by the base station device 3 at the start of access from the signal of the first OFDM symbol in slot 1. Then, it detects (recognizes and judges) that the base station device 3 has started access.

In slot 0, which is an LBT section, the terminal device 1 does not monitor PDCCH candidates in the search area of the first control resource set. In slot 0, which is an LBT section, the terminal device 1 does not monitor PDCCH candidates in the search region for the second control resource set. In slot 1 of the partial LBT section, terminal apparatus 1 does not monitor PDCCH candidates in the search area for the first control resource set. In slot 1 (first slot) of a part of the LBT section, the terminal device 1 searches for the first number of PDCCH candidates in the search area of the second control resource set after the timing at which the base station device 3 starts accessing. Monitor. Slot 1 is a slot (first slot) for which it is determined that the base station device 3 is transmitting a signal. The base station device 3 transmits the PDCCH to the terminal device 1 using the PDCCH candidate of the second control resource set of the slot 1. The terminal device 1 detects the PDCCH in the search area for the second control resource set in the slot 1.

In slot 0, which is the LBT section, the terminal device 1 does not monitor the first number of PDCCH candidates in the search area of the first control resource set. In slot 0, which is an LBT section, the terminal device 1 does not monitor the second number of PDCCH candidates in the search region for the second control resource set. In slot 1 (first slot), the terminal device 1 monitors a third number of PDCCH candidates in a search area of the first control resource set after the timing at which the access is started by the base station device 3. In slot 1, the terminal device 1 does not monitor PDCCH candidates in the search region for the second control resource set. Slot 1 is a slot (first slot) for which it is determined that the base station device 3 is transmitting a signal. The base station device 3 transmits the PDCCH to the terminal device 1 using the PDCCH candidate of the first control resource set of the slot 1. The terminal device 1 detects the PDCCH in the search area of the first control resource set in the slot 1.

The terminal device 1 searches for the first control resource set in the slot 2 (second slot) next to the slot 1 (first slot) in which the base station device 3 determines that the signal is being transmitted. Monitor a third number of PDCCH candidates. In slot 2, the terminal device 1 does not monitor PDCCH candidates in the search area for the second control resource set. In slot 2, the number of PDCCH candidates in the search area of the second control resource set is zero. In slot 2, the terminal device 1 need not set the PDCCH search area in the second control resource set. Similarly, the terminal device 1 monitors the third number of PDCCH candidates in the search area of the first control resource set in slot 3 (third slot) next to slot 2 (second slot), PDCCH candidates are not monitored in the second control resource set. Similarly, in slot 4, terminal apparatus 1 monitors a third number of PDCCH candidates in the search area for the first control resource set, and does not monitor PDCCH candidates in the second control resource set.

In a slot subsequent to slot 4 (such as slot 5), the LBT section is restarted, and terminal apparatus 1 searches for the first control resource set in the first control resource set search area until it determines that base station apparatus 3 is transmitting a signal. It does not monitor the number of PDCCH candidates and does not monitor the second number of PDCCH candidates in the search area of the second control resource set.

As described with reference to FIGS. 16 and 17, the PDCCH candidate monitored in the search area of the first control resource set of the first slot is determined based on the timing at which the base station apparatus 3 starts access in the first slot. The number, the number of PDCCH candidates monitored in the search area of the second control resource set in the first slot, and the number of PDCCH candidates monitored in the search area of the first control resource set in the second slot are adjusted. (Set, calculated). More specifically, based on whether or not the timing at which the base station apparatus 3 starts access in the first slot is later than the OFDM symbol constituting the first control resource set, the base station apparatus 3 is monitored in the search area of each control resource set. The number of PDCCH candidates is adjusted (set, calculated).

As described above, in the embodiment of the present invention, the terminal device 1 receives the PDCCH in the slot from the base station device 3, sets the first control resource set and the second control resource set, Monitor the PDCCH candidates in the control resource set and the second control resource set, decode the PDCCH candidates, configure the first control resource set in the OFDM symbol in the first half of the slot, and the OFDM symbol in the second half of the slot. A second control resource set, and monitor a first number of the PDCCH candidates in the second control resource set in the first slot where it is determined that the base station apparatus 3 is transmitting a signal. Monitor a second number of PDCCH candidates in a first control resource set in a second slot next to the first slot, Monitoring the PDCCH candidates in the third number in the in third slot the first control resource set. The value obtained by subtracting the first number from the third number is the second number.

As described above, in the embodiment of the present invention, the base station device 3 transmits the PDCCH in the slot, sets the first control resource set and the second control resource set for the terminal device 1, A PDCCH is transmitted using a PDCCH candidate in a first control resource set or a second control resource set in a slot, and a first control resource set is formed in an OFDM symbol of a first half of the slot, and a second half of the slot is formed. , A second control resource set is configured for the OFDM symbol, and a first control resource set is set to the first control resource set in the first slot in which signal transmission to the terminal device 1 is first started after the Listen-Before-Talk. Configure a number of PDCCH candidates, and add a second number of PDCCH candidates to the first control resource set in the second slot following the first slot. Configure DCCH candidate, constituting the PDCCH candidates in the third number to the first control resource set in the next third slot of the second slot. The value obtained by subtracting the first number from the third number is the second number.

As described above, according to one embodiment of the present invention, resources can be used efficiently and efficient communication can be realized. According to an aspect of the present invention, resources can be used efficiently without increasing the processing load of the terminal device 1. Efficient communication can be realized. If the timing at which the base station apparatus 3 becomes able to transmit a signal after the LBT does not coincide with the slot boundary, the base station apparatus 3 performs the first control in the first half OFDM symbol of the slot according to the timing. A PDCCH is transmitted to the terminal device 1 by using a PDCCH candidate of one of the control resource sets of the resource set or the second control resource set configured in the OFDM symbol of the latter half of the slot, and the PDSCH is allocated. be able to. That is, the base station device 3 can transmit the PDCCH to the terminal device 1 using the PDCCH candidate of the control resource set close to the timing (the timing at which the signal transmission becomes possible after the LBT), so that the scheduling is performed. , The waiting time is shortened, and it is possible to prevent a decrease in the utilization efficiency of resources (channels, frequencies) in the unlicensed frequency band. The terminal device 1 can receive data using many resources, and the transmission speed is improved. The timing at which the base station apparatus 3 can transmit a signal after the LBT does not coincide with the slot boundary, and the PDCCH candidate is monitored in the second control resource set configured in the OFDM symbol in the latter half of the slot / If configured, the number of PDCCH candidates monitored / configured in the first control resource set of the next slot is adjusted, so that PDCCH candidates for which blind decoding is performed within a predetermined time (for example, 1 ms) Can be suppressed, and an increase in the processing load on the terminal device 1 can be suppressed.

If the timing at which the base station apparatus 3 becomes able to transmit a signal after the LBT matches the boundary of the slot, the PDCCH candidate is monitored in the first control resource set configured using the OFDM symbol in the first half of the slot. / PDCCH candidates are not monitored / configured in the second control resource set configured using OFDM symbols in the latter half of the slot, and are monitored in the first control resource set in the next slot / There is no need to adjust the configured PDCCH candidates, and the PDSCH can be scheduled using many OFDM symbols in the slot while securing the flexibility of PDCCH scheduling. If the number of PDCCH candidates in the search area is small, the probability of occurrence of a blocking phenomenon in which resources (control channel elements) constituting the PDCCH candidates collide between the terminal devices 1 increases, but the number of PDCCH candidates in the search area increases. When the number of PDCCHs increases, the probability of blocking of PDCCH candidates is reduced, and the PDCCH can be flexibly allocated to the terminal device 1.

In the present embodiment, a case where two control resource sets are configured has been described, but the present invention can be applied to a case where three or more control resource sets are configured. For example, a case where three control resource sets (a first control resource set, a second control resource set, and a third control resource set) are configured will be described. For simplification of the description, the description of FIG. 16 is used for the configuration of the first control resource set, the configuration of the second control resource set, the LBT section (idle section), and the channel occupation section (busy section). Here, a case will be described in which the third control resource set is composed of OFDM symbols that are later than the OFDM symbols that constitute the second control resource set.

A description will be given of a case where, in the first slot, transmission of a signal by the base station apparatus 3 is started between an OFDM symbol constituting the first control resource set and an OFDM symbol constituting the second control resource set. In a first slot, PDCCH candidates are not monitored / configured in a first control resource set, a first number of PDCCH candidates are monitored / configured in a second control resource set, and a third control resource PDCCH candidates are not monitored / configured in the set. In a second slot, a second number of PDCCH candidates are monitored / configured in the first control resource set, PDCCH candidates are not monitored / configured in the second control resource set, and a third control resource PDCCH candidates are not monitored / configured in the set. In a third slot, a second number of PDCCH candidates are monitored / configured in the first control resource set, PDCCH candidates are not monitored / configured in the second control resource set, and a third control resource PDCCH candidates are not monitored / configured in the set.

Next, a case will be described in which, in the first slot, transmission of a signal by the base station apparatus 3 is started between the OFDM symbol constituting the second control resource set and the OFDM symbol constituting the third control resource set. I do. In the first slot, the PDCCH candidate is not monitored / configured in the first control resource set, the PDCCH candidate is not monitored / configured in the second control resource set, and the PDCCH candidate is not monitored / configured in the third control resource set. A number of PDCCH candidates are monitored / configured. In a second slot, a second number of PDCCH candidates are monitored / configured in the first control resource set, PDCCH candidates are not monitored / configured in the second control resource set, and a third control resource PDCCH candidates are not monitored / configured in the set. In a third slot, a second number of PDCCH candidates are monitored / configured in the first control resource set, PDCCH candidates are not monitored / configured in the second control resource set, and a third control resource PDCCH candidates are not monitored / configured in the set.

In the first slot, the first number when PDCCH candidates are monitored / configured in the second control resource set and the PDCCH candidates are monitored / configured in the third control resource set May have different values. The number of PDCCH candidates monitored / configured in the third control resource set may be a fourth number.

In the above-described embodiment, a case has been mainly described where the OFDM symbols configured in the time domain of the control resource set are limited (specified or set). However, only the frequency domain resources are limited ( The present invention can also be applied to a case where resources in the time domain are not limited (specified and set) and resources in the time domain are not limited (not specified and not set). Rather than the time domain being limited (specified and set) in the control resource set, the time domain, that is, the OFDM symbol, is limited (specified and set) in the search area.

13 to 17, even if the first control resource set is a first search area of the first control resource set and the second control resource set is a second search area of the first control resource set. Good. 13 to 17, even if the first control resource set is the first search area of the first control resource set and the second control resource set is the first search area of the second control resource set. Good. In other words, the present invention is applicable to a case where different search regions in the same control resource set are composed of different OFDM symbols in a slot, and a case where search regions in different control resource sets are composed of different OFDM symbols in a slot. The invention can be applied.

The terminal device 1 receives a PDCCH in a slot from the base station device 3, sets a first search region and a second region, monitors PDCCH candidates in the first search region and the second search region, The PDCCH candidate is decoded, the first search area is configured in the first half of the slot, and the second search area is configured in the second half of the slot. Monitoring a first number of said PDCCH candidates in a second search area in a first slot determined to be present and a second number in said first search area in a second slot next to said first slot. , And monitor the third number of PDCCH candidates in the first search area in the third slot next to the second slot. The value obtained by subtracting the first number from the third number is the second number.

The base station device 3 transmits the PDCCH in the slot, sets the first search region and the second search region for the terminal device 1, and sets the first search region or the second search region in the slot. A PDCCH is transmitted using the PDCCH candidate, a first search region is configured in the first half of the OFDM symbol, a second search region is configured in the second half of the slot, and after the Listen-Before-Talk. A first number of PDCCH candidates is formed in a second search area in a first slot in which signal transmission to the terminal device 1 is started first, and a second slot next to the first slot is used for a first slot. A second number of PDCCH candidates is configured in one search area, and a third number of PDCCH candidates is configured in the first search area in a third slot next to the second slot. The value obtained by subtracting the first number from the third number is the second number.

受 信 The reception processing unit of the terminal device 1 monitors the PDCCH candidates in the first search area and the second search area. The first search area is composed of OFDM symbols in the first half of the slot. The second search area is composed of OFDM symbols in the latter half of the slot. The reception processing unit of the terminal device 1 monitors the first number of PDCCH candidates in the second search region in the slot (first slot) where it is determined that the base station device 3 is transmitting a signal. The reception processing unit of the terminal device 1 transmits a second number of PDCCH candidates in the first search area in the next slot (second slot) of the slot determined that the base station device 3 is transmitting a signal. To monitor. The reception processing unit of the terminal device 1 monitors a third number of PDCCH candidates in the first search area in a subsequent slot (third slot). A value obtained by subtracting the first number from the third number may be equal to the second number. The second number may be smaller than a value obtained by subtracting the first number from the third number. The second number may be determined based on the third number and the first number.

The radio resource control layer processing unit 16 sets a search area based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a first search area and a second search area based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets an OFDM symbol constituting the first search area based on the RRC signaling received from the base station device. Radio resource control layer processing section 16 sets an OFDM symbol constituting the first search area to an OFDM symbol in the first half of the slot. The radio resource control layer processing unit 16 sets an OFDM symbol constituting the second search area based on the RRC signaling received from the base station device. Radio resource control layer processing section 16 sets an OFDM symbol constituting the second search area to an OFDM symbol in the latter half of the slot.

The radio resource control layer processing unit 16 sets a value based on RRC signaling for the number of PDCCH candidates monitored in the first search area. Radio resource control layer processing section 16 sets a value based on RRC signaling for the number of PDCCH candidates monitored in the second search area. The reception processing unit of the terminal device 1 determines the number set by the radio resource control layer processing unit 16 in the second search area in the first slot in which it is determined that the base station device 3 is transmitting a signal (the (One number) of PDCCH candidates. The reception processing unit of the terminal device 1 monitors the number (third number) of PDCCH candidates set by the radio resource control layer processing unit 16 in the first search area in the third slot. The reception processing unit of the terminal device 1 monitors a second number of PDCCH candidates in the first search area in the second slot. The second number is a value obtained by subtracting the first number from the third number. Further, the second number may be a value smaller than a value obtained by subtracting the first number from the third number. The second number may be a value obtained by equally dividing the third number based on the number of the plurality of search areas within a predetermined time. The second number may be determined based on the third number and the first number. The second number may be determined based on the third number based on the number of the plurality of search areas within a predetermined time.

受 信 When monitoring the PDCCH candidates in the first search area in the first slot, the reception processing unit of the terminal device 1 does not monitor the PDCCH candidates in the second search area in the first slot. When monitoring the PDCCH candidates in the first search area in the first slot, the reception processing unit of the terminal device 1 sets the number set by the radio resource control layer processing unit 16 in the first search area (the (3) PDCCH candidates are monitored. The reception processing unit of the terminal device 1 monitors a PDCCH candidate in the first search area in the first slot, and monitors a PDCCH candidate in the second search area in the first slot. Monitor the number (third number) of PDCCH candidates set by the radio resource control layer processing unit 16 in the first search area.

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 a first search area and a second search area for the terminal device 1. A plurality of PDCCH candidates are configured in the set search area. A plurality of PDCCH candidates are configured in the first search area set in a certain slot. A plurality of PDCCH candidates are configured in the second search area set in a certain slot. The radio resource control layer processing unit 36 sets a first search area in the first half OFDM symbol of the slot. The radio resource control layer processing unit 36 sets a second search area in the OFDM symbol in the latter half of the slot.

に お い て A third number of PDCCH candidates are configured in the first search area in a certain slot. In a certain slot, a second number of PDCCH candidates are configured in the second search area. In a certain slot, a second number of PDCCH candidates are configured in the first search area. A first number of PDCCH candidates is configured in the second search region in the first slot in the base station device 3 where a signal transmission to the terminal device 1 is first started after the Listen-Before-Talk. A second number of PDCCH candidates is configured in the first search area by a second slot that is a slot next to the first slot. A third number of PDCCH candidates is configured in the first search area by a third slot that is a slot next to the second slot. The second number is a value obtained by subtracting the first number from the third number. Further, the second number may be a value smaller than a value obtained by subtracting the first number from the third number. The second number may be a value obtained by equally dividing the third number based on the number of the plurality of search areas within a predetermined time. The second number may be determined based on the third number and the first number. The second number may be determined based on the third number based on the number of the plurality of search areas within a predetermined time.

When the PDCCH candidate in the first search area is configured in the first slot for the terminal apparatus 1, the base station apparatus 3 sets the PDCCH candidate in the second search area in the first slot for the terminal apparatus 1. The PDCCH candidate need not be configured. When configuring the PDCCH candidates in the first search region with the first slot for the terminal device 1, the base station device 3 configures the third number of PDCCH candidates in the first search region. Is also good. The base station apparatus 3 configures a PDCCH candidate in the first search area in the first slot with respect to the terminal apparatus 1 and does not configure a PDCCH candidate in the second search area in the first slot. For the device 1, a third number of PDCCH candidates may be configured in the first search area in the second slot.

The wireless transmission / reception unit 30 grasps a first search area configured in the terminal device 1 and a second search area configured in the terminal device 1. The radio transmitting / receiving unit 30 grasps a PDCCH candidate monitored by the terminal device 1 and grasps a search area. The wireless transmission / reception unit 30 includes an SS grasping unit, and the SS grasping unit grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates in the control resource set configured as Search @ space of the terminal device. The SS grasping unit grasps PDCCH candidates (the number of PDCCH candidates and the number of PDCCH candidates) configured in the first search area and the second search area of the terminal device 1.

The SS grasping unit sets the first number in the second search area for the first slot, which is the slot from which signal transmission to the terminal device 1 is started first after the Listen-Before-Talk by the base station device 3 Of PDCCH candidates are configured. The SS grasping unit grasps that a second number of PDCCH candidates is configured in the first search area for a second slot that is a slot next to the first slot. The SS grasping unit grasps that a third number of PDCCH candidates is configured in the first search area for a third slot that is a slot next to the second slot. The transmitting unit of the wireless transmitting / receiving unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidate in the first search area or the second search area.

When a PDCCH candidate in the first search region is configured in the first slot for the terminal device 1, the SS grasping unit configures a third number of PDCCH candidates in the first search region. You may understand that. When the PDCCH candidate in the first search region is configured in the first slot for the terminal device 1, the SS grasping unit determines whether the PDCCH candidate in the second search region is in the first slot for the terminal device 1. You may know that a PDCCH candidate is not configured. If the PDCCH candidate in the first search area is configured in the first slot and the PDCCH candidate is not configured in the second search area in the first slot, the SS grasping unit determines whether the terminal apparatus 1 It may be understood that a third number of PDCCH candidates are configured in the first search area in the second slot with respect to 1.

As described above, according to one embodiment of the present invention, resources can be used efficiently and efficient communication can be realized. According to an aspect of the present invention, resources can be used efficiently without increasing the processing load of the terminal device 1. Efficient communication can be realized. If the timing at which the base station apparatus 3 becomes able to transmit a signal after the LBT does not coincide with the slot boundary, the base station apparatus 3 performs the first search configured in the first half OFDM symbol of the slot according to the timing. A PDCCH can be transmitted to the terminal device 1 using a PDCCH candidate in one of the second search regions configured in the OFDM symbol of the region or the latter half of the slot, and the PDSCH can be allocated. . That is, the base station device 3 can transmit the PDCCH to the terminal device 1 by using the PDCCH candidate in the search area close to the timing (the timing at which the signal transmission becomes possible after the LBT). The waiting time is shortened, and it is possible to prevent a decrease in the utilization efficiency of resources (channels, frequencies) in the unlicensed frequency band. The terminal device 1 can receive data using many resources, and the transmission speed is improved. The timing at which the base station apparatus 3 can transmit a signal after the LBT does not coincide with the slot boundary, and the PDCCH candidate is monitored / configured in the second search area configured in the OFDM symbol in the latter half of the slot. If the number of PDCCH candidates monitored / configured in the first search area of the next slot is adjusted, the maximum number of PDCCH candidates for which blind decoding is performed within a predetermined time (for example, 1 ms) is performed. The number can be suppressed, and an increase in the processing load of the terminal device 1 can be suppressed.

If the timing at which the base station apparatus 3 can transmit a signal after the LBT coincides with the slot boundary, the PDCCH candidate is monitored in the first search area configured using the OFDM symbol in the first half of the slot. The PDCCH candidate is not monitored / configured in the second search region configured using the OFDM symbol in the latter half of the slot, so that it is monitored / configured in the first search region of the next slot. There is no need to adjust PDCCH candidates, and PDSCH can be scheduled using many OFDM symbols in a slot while securing flexibility of PDCCH scheduling. If the number of PDCCH candidates in the search area is small, the probability of occurrence of a blocking phenomenon in which resources (control channel elements) constituting the PDCCH candidates collide between the terminal devices 1 increases, but the number of PDCCH candidates in the search area increases. When the number of PDCCHs increases, the probability of blocking of PDCCH candidates is reduced, and the PDCCH can be flexibly allocated to the terminal device 1.

In the above description, the first search area and the second search area may be configured in the same control resource set, or may be configured in different control resource sets.

(1) In order to achieve the above object, the present invention has taken the following measures. That is, a first aspect of the present invention is a terminal device for receiving a PDCCH in a slot from a base station device, and a radio resource for setting a first control resource set and a second control resource set based on RRC signaling. A control layer processing unit, a receiving unit that monitors a PDCCH candidate in the first control resource set and the second control resource set, and a decoding unit that decodes the PDCCH candidate, wherein the first control resource set Is composed of OFDM symbols of the first half of the slot, the second control resource set is composed of OFDM symbols of the second half of the slot, and the first control resource set is determined that the base station apparatus is transmitting a signal. Monitoring a first number of said PDCCH candidates in said second control resource set in slots of said first Monitoring a second number of said PDCCH candidates in said first control resource set in a second slot next to said first slot, and said first control resource in a third slot next to said second slot. A third number of the PDCCH candidates in the set are monitored.

(2) The first aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(3) A second aspect of the present invention is a communication method used for a terminal device that receives a PDCCH in a slot from a base station device, wherein the first control resource set and the second control resource are based on RRC signaling. Setting a set, monitoring a PDCCH candidate in the first control resource set and the second control resource set, and decoding the PDCCH candidate, wherein the first control resource set comprises: The first control resource set is composed of OFDM symbols of the first half of the slot, and the second control resource set is composed of OFDM symbols of the second half of the slot, and the first control resource set is determined to be transmitting a signal. Monitoring a first number of said PDCCH candidates in said second control resource set in a slot, Monitoring a second number of said PDCCH candidates in said first control resource set in a second slot next to said slot, said first control resource in a third slot next to said second slot A third number of the PDCCH candidates in the set are monitored.

(4) The second aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(5) A third aspect of the present invention is a base station apparatus for transmitting a PDCCH in a slot, and radio resource control for setting a first control resource set and a second control resource set for a terminal apparatus A layer processing unit, comprising a transmitting unit that transmits the PDCCH using a PDCCH candidate in the first control resource set or the second control resource set in the slot, wherein the first control resource set is The second control resource set is composed of OFDM symbols of the first half of the slot, and the second control resource set is composed of OFDM symbols of the second half of the slot. Signal transmission to the terminal device starts first after Listen-Before-Talk. A first number of the PDCCH candidates is configured in the second control resource set in a first slot to be performed. The second number of the PDCCH candidates is configured in the first control resource set in the second slot next to the first slot, and the second number of the PDCCH candidates is configured in the third slot next to the second slot. The third number of the PDCCH candidates is configured in one control resource set.

(6) The third aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(7) A fourth aspect of the present invention is a communication method used for a base station apparatus transmitting a PDCCH in a slot, wherein a first control resource set and a second control resource set are transmitted to a terminal apparatus. Setting, and transmitting the PDCCH using a PDCCH candidate in the first control resource set or the second control resource set in the slot, wherein the first control resource set is , And the second control resource set includes OFDM symbols in the latter half of the slot, and after the Listen-Before-Talk, signal transmission to the terminal device starts first. A first number of said PDCCH candidates in said second control resource set in a first slot Is configured, a second number of the PDCCH candidates is configured in the first control resource set in a second slot next to the first slot, and the PDCCH candidate is configured in a third slot next to the second slot. The third control resource set includes a third number of the PDCCH candidates.

(8) A fourth aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(9) A fifth aspect of the present invention is a terminal apparatus for receiving a PDCCH in a slot from a base station apparatus, and performs radio resource control for setting a first search area and a second search area based on RRC signaling. A layer processing unit; a receiving unit that monitors a PDCCH candidate in the first search area and the second search area; and a decoding unit that decodes the PDCCH candidate. The second search area is composed of a first half OFDM symbol, and the second search area is composed of a second half OFDM symbol of the slot. Monitoring a first number of said PDCCH candidates in a second search area and a second number of said PDCCHs in said first search area in a second slot next to said first slot Monitor the H candidates, characterized by monitoring the PDCCH candidates in the second next third third of the number in the first search region in a slot of the slot.

(10) A fifth aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(11) A sixth aspect of the present invention is a communication method used for a terminal device that receives a PDCCH in a slot from a base station device, wherein a first search region and a second search region are determined based on RRC signaling. Setting, monitoring a PDCCH candidate in the first search area and the second search area, and decoding the PDCCH candidate, wherein the first search area is a first half of the slot. And the second search area is composed of the latter part of the slot, and the second search area is composed of the second slot in the first slot where it is determined that the base station apparatus is transmitting a signal. Monitoring a first number of the PDCCH candidates in a search area, and a second number of PDCCH candidates in the first search area in a second slot next to the first slot. Serial monitor the PDCCH candidates, characterized by monitoring the PDCCH candidates in the second next third third of the number in the first search region in a slot of the slot.

(12) The sixth aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(13) A seventh aspect of the present invention is a base station apparatus for transmitting a PDCCH in a slot, and a radio resource control layer process for setting a first search area and a second search area for a terminal device And a transmitting unit for transmitting the PDCCH using a PDCCH candidate in the first search area or the second search area in the slot, wherein the first search area is a first half of the slot. A first slot in which transmission of a signal to the terminal device is first started after a Listen-Before-Talk; A first number of the PDCCH candidates is configured in the second search area, and a second number of the PDCCH candidates is configured in the first search area in a second slot next to the first slot. The PDCCH candidates are configured number of the PDCCH candidates in the third number to said second of said first search region in the next third slot of the slot is characterized in that it is configured.

(14) A seventh aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

(15) An eighth aspect of the present invention is a communication method used for a base station device transmitting a PDCCH in a slot, wherein a first search region and a second search region are set for a terminal device. And transmitting the PDCCH using a PDCCH candidate in the first search area or the second search area in the slot, wherein the first search area is an OFDM of a first half of the slot. And the second search area is composed of an OFDM symbol in the latter half of the slot, and is a first slot in which transmission of a signal to the terminal device starts first after Listen-Before-Talk. A first number of the PDCCH candidates is configured in the second search area, and the first search area is set in a second slot next to the first slot. Wherein a second number of the PDCCH candidates is configured, and a third number of the PDCCH candidates is configured in the first search area in a third slot next to the second slot. .

(16) The eighth aspect of the present invention is further characterized in that a value obtained by subtracting the first number from the third number is the second number.

The program operating on the base station device 3 and the terminal device 1 according to one aspect of the present invention controls a CPU (Central Processing Unit) and the like so as to realize the functions of the above-described embodiment according to one aspect of the present invention. It may be a program (a program that causes a computer to function). The information handled by these devices is temporarily stored in a RAM (Random Access Memory) at the time of processing, and thereafter stored in various ROMs such as a Flash ROM (Read Only Memory) or an HDD (Hard Disk Drive). Reading, correction and writing are performed by the CPU as necessary.

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

Note that the “computer system” here is a computer system built in the terminal device 1 or the base station device 3 and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in a computer system.

Further, the "computer-readable recording medium" is a medium that holds the program dynamically for a short time, such as a communication line for transmitting the program through a network such as the Internet or a communication line such as a telephone line, In this case, a program that holds a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client, may be included. Further, the program may be for realizing a part of the functions described above, or may be for realizing the functions described above in combination with a program already recorded in the computer system.

The base station device 3 in the above-described embodiment can also be realized as an aggregate (device group) including a plurality of devices. Each of the devices included in the device group may include a part or all of each function or each functional block of the base station device 3 according to the above-described embodiment. It is only necessary that the device group has each function or each function block of the base station device 3. Further, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as an aggregate.

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

In addition, part or all of the terminal device 1 and the base station device 3 in the above-described embodiment may be typically realized as an LSI which is 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 formed into a chip, or a part or all may be integrated and formed into a chip. The method of circuit integration is not limited to an LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where a technology for forming an integrated circuit that replaces the LSI appears due to the advance of the semiconductor technology, an integrated circuit based on the technology can be used.

Further, in the above-described embodiments, the terminal device is described as an example of the communication device. For example, the present invention can be applied to a terminal device or a communication device such as an AV device, a kitchen device, a cleaning / washing device, an air conditioner, an office device, a vending machine, and other living devices.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments, and may include design changes within the scope of the present invention. Further, the present invention can be variously modified within the scope shown in the claims, and the technical scope of the present invention includes embodiments obtained by appropriately combining technical means disclosed in different embodiments. It is. The elements described in each of the above embodiments include a configuration in which elements having similar effects are replaced with each other.

Claims (8)

1. A terminal device for receiving a PDCCH in a slot from a base station device,
   A radio resource control layer processing unit that sets a first control resource set and a second control resource set based on RRC signaling;
   A receiving unit that monitors a PDCCH candidate in the first control resource set and the second control resource set,
   A decoding unit for decoding the PDCCH candidate,
   The first control resource set is composed of OFDM symbols of a first half of the slot;
   The second control resource set is composed of OFDM symbols in the latter half of the slot,
   The base station apparatus monitors a first number of the PDCCH candidates in the second control resource set in the first slot determined to be transmitting a signal,
   Monitoring a second number of the PDCCH candidates in the first control resource set in a second slot next to the first slot,
   The terminal device monitors a third number of the PDCCH candidates in the first control resource set in a third slot next to the second slot.
2. 2. The terminal device according to claim 1, wherein a value obtained by subtracting the first number from the third number is the second number. 3.
3. A communication method used for a terminal device that receives a PDCCH in a slot from a base station device,
   Setting a first control resource set and a second control resource set based on RRC signaling;
   Monitoring PDCCH candidates in the first control resource set and the second control resource set;
   Decoding the PDCCH candidate,
   The first control resource set is composed of OFDM symbols of a first half of the slot;
   The second control resource set is composed of OFDM symbols in the latter half of the slot,
   The base station apparatus monitors a first number of the PDCCH candidates in the second control resource set in the first slot determined to be transmitting a signal,
   Monitoring a second number of the PDCCH candidates in the first control resource set in a second slot next to the first slot,
   A communication method, comprising: monitoring a third number of the PDCCH candidates in the first control resource set in a third slot next to the second slot.
4. 4. The communication method according to claim 3, wherein a value obtained by subtracting the first number from the third number is the second number.
5. A base station device for transmitting a PDCCH in a slot,
   A radio resource control layer processing unit that sets a first control resource set and a second control resource set for the terminal device,
   The first control resource set in the slot, or a transmission unit that transmits the PDCCH using a PDCCH candidate in the second control resource set,
   The first control resource set is composed of OFDM symbols of a first half of the slot;
   The second control resource set is composed of OFDM symbols in the latter half of the slot,
   A first number of the PDCCH candidates is configured in the second control resource set in a first slot in which transmission of a signal to the terminal device is first started after the Listen-Before-Talk,
   A second number of the PDCCH candidates is configured in the first control resource set in a second slot next to the first slot,
   A base station apparatus, wherein a third number of the PDCCH candidates is configured in the first control resource set in a third slot next to the second slot.
6. The base station apparatus according to claim 5, wherein a value obtained by subtracting the first number from the third number is the second number.
7. A communication method used for a base station apparatus transmitting a PDCCH in a slot,
   Setting a first control resource set and a second control resource set for the terminal device;
   In the slot, the first control resource set, or comprises a step of transmitting the PDCCH using a PDCCH candidate in the second control resource set,
   The first control resource set is composed of OFDM symbols of a first half of the slot;
   The second control resource set is composed of OFDM symbols in the latter half of the slot,
   A first number of the PDCCH candidates is configured in the second control resource set in a first slot in which transmission of a signal to the terminal device is first started after the Listen-Before-Talk,
   A second number of the PDCCH candidates is configured in the first control resource set in a second slot next to the first slot,
   A communication method, wherein a third number of the PDCCH candidates is configured in the first control resource set in a third slot next to the second slot.
8. 8. The communication method according to claim 7, wherein a value obtained by subtracting the first number from the third number is the second number.

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