WO2021215779A1 - Method and apparatus for transmitting and receiving signals in wireless communication system - Google Patents

Abstract

A method and apparatus for transmitting and receiving signals in a wireless communication system, according to an embodiment of the present invention, comprise configuring a carrier group including a plurality of CCs, and receiving downlink control information (DCI) having a DCI format 2_0 on a specific CC in the carrier group. One or more parameters included in the DCI may be used for all CCs in the carrier group.

Description

Method and apparatus for transmitting and receiving signals in a wireless communication system

The present invention relates to a method and apparatus for use in a wireless communication system.

Wireless communication systems are being widely deployed to provide various types of communication services such as voice and data. In general, a wireless communication system is a multiple access system that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of the multiple access system include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, and a Single Carrier Frequency (SC-FDMA) system. Division Multiple Access) system.

An object of the present invention is to provide a signal transmission/reception method for efficiently receiving control information in a wireless communication system, and an apparatus therefor.

The technical problem of the present invention is not limited to the above technical problem, and other technical problems can be inferred from the embodiments of the present invention.

The present invention provides a method and apparatus for transmitting and receiving a signal in a wireless communication system.

As an aspect of the present invention, there is provided a method for a terminal to transmit and receive a signal in a wireless communication system, the method comprising: setting a carrier group including a plurality of CCs (Component Carriers); and receiving a DCI having a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group. Including, one or more parameters included in the DCI is used for all CCs in the carrier group, a signal transmission and reception method is provided.

As another aspect of the present invention, there is provided a method for a base station to transmit and receive a signal in a wireless communication system, the method comprising: setting a carrier group including a plurality of CCs (Component Carriers); and transmitting a DCI having a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group, wherein one or more parameters included in the DCI are used for all CCs in the carrier group. Signal transmission/reception method this is provided

As another aspect of the present invention, an apparatus, a processor, and a storage medium for performing the signal transmission and reception methods are provided.

In the methods and apparatuses, the DCI may be transmitted/received only to the specific CC among CCs included in the carrier group.

In the methods and apparatuses, the one or more parameters may be used for all CCs in the carrier group based on DCI being transmitted and received on a number of CCs equal to or greater than a threshold among all CCs in the carrier group.

In the methods and apparatuses, the one or more parameters may include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information on a search space set group switching.

In the methods and apparatuses, a timer for search space set group switching may be used for all CCs in the carrier group.

In the methods and apparatuses, the carrier group may be established based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system.

The devices may include at least a terminal, a network and an autonomous vehicle capable of communicating with an autonomous vehicle other than the device.

Aspects of the present invention described above are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected are detailed descriptions of the present invention that will be described below by those of ordinary skill in the art. It can be derived and understood based on the description.

According to an embodiment of the present invention, when control information is transmitted/received between communication devices, there is an advantage that more efficient uplink channel transmission can be performed through an operation differentiated from the conventional invention.

The technical effects of the present invention are not limited to the above-described technical effects, and other technical effects can be inferred from the embodiments of the present invention.

1 illustrates the structure of a radio frame.

2 illustrates a resource grid of slots.

3 shows an example in which a physical channel is mapped in a slot.

4 illustrates an ACK/NACK transmission process.

5 illustrates a PUSCH transmission process.

6 illustrates a wireless communication system supporting an unlicensed band.

7 illustrates a method of occupying a resource in an unlicensed band.

8 and 9 are a CAP (Channel Access Procedure) flowchart for signal transmission through an unlicensed band.

10 shows a flowchart according to an embodiment of the present invention.

11-14 illustrate devices according to an embodiment of the present invention.

The following techniques can be used in various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA and LTE-A (Advanced)/LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE/LTE-A/LTE-A pro.

In order to clarify the description, the description is based on a 3GPP communication system (eg, LTE, NR), but the technical spirit of the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. In detail, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE/NR may be referred to as a 3GPP system. "xxx" means standard document detail number. LTE/NR may be collectively referred to as a 3GPP system. For backgrounds, terms, abbreviations, etc. used in the description of the present invention, reference may be made to matters described in standard documents published before the present invention. For example, you can refer to the following documents:

3GPP NR

- 38.211: Physical channels and modulation

- 38.212: Multiplexing and channel coding

- 38.213: Physical layer procedures for control

- 38.214: Physical layer procedures for data

- 38.300: NR and NG-RAN Overall Description

- 38.331: Radio Resource Control (RRC) protocol specification

1 illustrates the structure of a radio frame used in NR.

In NR, uplink (UL) and downlink (DL) transmission consists of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (Half-Frame, HF). A half-frame is defined as 5 1ms subframes (Subframe, SF). A subframe is divided into one or more slots, and the number of slots in the subframe depends on subcarrier spacing (SCS). Each slot includes 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP). When a normal CP (CP) is used, each slot includes 14 symbols. When an extended CP (extended CP) is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or a CP-OFDM symbol) and an SC-FDMA symbol (or a DFT-s-OFDM symbol).

Table 1 exemplifies that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when CP is usually used.

[Table 1]

Table 2 illustrates that when the extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS.

[Table 2]

In the NR system, OFDM(A) numerology (eg, SCS, CP length, etc.) may be set differently between a plurality of cells merged into one user equipment (UE). Accordingly, an (absolute time) interval of a time resource (eg, SF, slot, or TTI) (commonly referred to as a TU (Time Unit) for convenience) composed of the same number of symbols may be set differently between the merged cells.

NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) numerology (eg, subcarrier spacing, SCS) to support various 5G services. For example, when SCS is 15kHz, it supports a wide area in traditional cellular bands, and when SCS is 30kHz/60kHz, dense-urban, lower latency and a wider carrier bandwidth.

The NR frequency band is defined by two types of frequency range (FR) (FR1/FR2). FR1/FR2 may be configured as shown in Table 3 below. In addition, FR2 may mean a millimeter wave (mmW).

[Table 3]

2 illustrates the slot structure of an NR frame.

A slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 14 symbols, and in the case of an extended CP, one slot includes 12 symbols. The carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. A plurality of RB interlaces (simply, interlaces) may be defined in the frequency domain. Interlace m∈{0, 1, ..., M-1} may be composed of (common) RB {m, M+m, 2M+m, 3M+m, ...}. M represents the number of interlaces. BWP (Bandwidth Part) is defined as a plurality of consecutive RBs (eg, physical RB, PRB) in the frequency domain, and may correspond to one OFDM numerology (eg, SCS(u), CP length, etc.) have. A carrier may include a maximum of N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated for one UE in one cell/carrier. Each element in the resource grid is referred to as a resource element (RE), and one modulation symbol may be mapped.

In a wireless communication system, a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station. Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels/signals exist according to the type/use of the information they transmit and receive. A physical channel corresponds to a set of resource elements (REs) carrying information derived from a higher layer. A physical signal corresponds to a set of resource elements (REs) used by the physical layer (PHY), but does not carry information derived from a higher layer. The upper layer includes a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Resource Control (RRC) layer, and the like.

The DL physical channel includes a Physical Broadcast Channel (PBCH), a Physical Downlink Shared Channel (PDSCH), and a Physical Downlink Control Channel (PDCCH). The DL physical signal includes a DL RS (Reference Signal), PSS (Primary Synchronization Signal), and SSS (Secondary Synchronization Signal). The DL RS includes a demodulation RS (DM-RS), a phase-tracking RS (PT-RS), and a channel-state information RS (CSI-RS). The UL physical channels include a Physical Random Access Channel (PRACH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH). The UL physical signal includes the UL RS. UL RS includes DM-RS, PT-RS and SRS (Sounding RS).

3 shows an example in which a physical channel is mapped in a slot.

A DL control channel, DL or UL data, and a UL control channel may all be included in one slot. For example, the first N symbols in a slot may be used to transmit a DL control channel (hereinafter, DL control region), and the last M symbols in a slot may be used to transmit a UL control channel (hereinafter, UL control region). N and M are each an integer greater than or equal to 0. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region may be used for DL data transmission or UL data transmission. A time gap for DL-to-UL or UL-to-DL switching may exist between the control region and the data region. The PDCCH may be transmitted in the DL control region, and the PDSCH may be transmitted in the DL data region. Some symbols at the time of switching from DL to UL in a slot may be used as a time gap.

In the present invention, the base station may be, for example, a gNodeB.

4 illustrates an ACK/NACK transmission process. Referring to FIG. 4 , the UE may detect the PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (eg, DCI formats 1_0 and 1_1), and the PDCCH indicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0 and 1_1 may include the following information.

- Frequency domain resource assignment: indicates the RB set assigned to the PDSCH

- Time domain resource assignment: K0, indicates the starting position (eg, OFDM symbol index) and length (eg, number of OFDM symbols) of the PDSCH in the slot

- PDSCH-to-HARQ_feedback timing indicator: indicates K1

Thereafter, after receiving the PDSCH in slot #(n+K0) according to the scheduling information of slot #n, the UE may transmit UCI through PUCCH in slot #(n+K1). Here, the UCI includes a HARQ-ACK response for the PDSCH. If the PDSCH is configured to transmit a maximum of 1 TB, the HARQ-ACK response may consist of 1-bit. When the PDSCH is configured to transmit a maximum of 2 TBs, the HARQ-ACK response may be configured with 2-bits when spatial bundling is not configured, and may be configured with 1-bits when spatial bundling is configured. When the HARQ-ACK transmission time for the plurality of PDSCHs is designated as slot #(n+K1), the UCI transmitted in the slot #(n+K1) includes HARQ-ACK responses for the plurality of PDSCHs.

5 illustrates a PUSCH transmission process. Referring to FIG. 5 , the UE may detect the PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (eg, DCI formats 0_0, 0_1). DCI formats 0_0 and 0_1 may include the following information.

- Frequency domain resource assignment: indicates the RB set assigned to the PUSCH

- Time domain resource assignment: indicates the slot offset K2, the start position (eg, symbol index) and length (eg, number of OFDM symbols) of the PUSCH in the slot. The start symbol and length may be indicated through a Start and Length Indicator Value (SLIV) or may be indicated respectively.

Thereafter, the UE may transmit the PUSCH in slot #(n+K2) according to the scheduling information of slot #n. Here, PUSCH includes UL-SCH TB.

1. Wireless communication system supporting unlicensed band

6 shows an example of a wireless communication system supporting an unlicensed band applicable to the present invention.

In the following description, a cell operating in a licensed band (L-band) is defined as an L-cell, and a carrier of the L-cell is defined as a (DL/UL) Licensed Component Carrier (LCC). In addition, a cell operating in an unlicensed band (U-band) is defined as a U-cell, and a carrier of the U-cell is defined as a (DL/UL) UCC. The carrier/carrier-frequency of the cell may refer to an operating frequency (eg, center frequency) of the cell. A cell/carrier (eg, CC) is collectively referred to as a cell.

When the terminal and the base station transmit and receive signals through the carrier-coupled LCC and UCC as shown in FIG. 6(a), the LCC may be set to a PCC (Primary CC) and the UCC may be set to an SCC (Secondary CC). As shown in FIG. 6B , the terminal and the base station may transmit and receive signals through one UCC or a plurality of carrier-coupled UCCs. That is, the terminal and the base station can transmit and receive signals through only UCC(s) without LCC. For standalone operation, PRACH, PUCCH, PUSCH, SRS transmission, etc. may be supported in the UCell.

Hereinafter, the signal transmission/reception operation in the unlicensed band described in the present invention may be performed based on all the above-described deployment scenarios (unless otherwise stated).

Unless otherwise stated, the definitions below may be applied to terms used herein.

- Channel: Consists of continuous RBs in which a channel access process is performed in a shared spectrum, and may refer to a carrier or a part of a carrier.

- Channel Access Procedure (CAP): Indicates a procedure for evaluating channel availability based on sensing in order to determine whether other communication node(s) use a channel before signal transmission. A basic unit for sensing is a _{sensing slot of T sl} =9us duration. When the base station or the terminal senses the channel during the sensing slot period and the power detected for at least 4us within the sensing slot period _{is less than the energy detection threshold X Thresh} , the sensing slot period T _sl is considered to be in the idle state. Otherwise, the sensing slot period T _sl =9us is considered a busy state. The CAP may be referred to as Listen-Before-Talk (LBT).

- Channel occupancy: means the corresponding transmission (s) on the channel (s) by the base station / terminal after performing the channel access procedure.

- Channel Occupancy Time (COT): After the base station / terminal performs the channel access procedure, any (any) base station / terminal (s) sharing the channel occupancy with the base station / terminal transmits (s) on the channel ) refers to the total time that can be performed. When determining the COT, if the transmission gap is 25us or less, the gap period is also counted in the COT. The COT may be shared for transmission between the base station and the corresponding terminal(s).

- DL transmission burst (burst): defined as the set of transmissions from the base station, with no gaps exceeding 16us. Transmissions from the base station, separated by a gap greater than 16 us, are considered separate DL transmission bursts from each other. The base station may perform the transmission(s) after the gap without sensing channel availability within the DL transmission burst.

- UL Transmission Burst: Defined as the set of transmissions from the terminal, with no gap exceeding 16us. Transmissions from the terminal, separated by a gap greater than 16us, are considered as separate UL transmission bursts from each other. The UE may perform transmission(s) after the gap without sensing channel availability within the UL transmission burst.

- Discovery Burst: refers to a DL transmission burst comprising a set of signal(s) and/or channel(s), defined within a (time) window and associated with a duty cycle. In an LTE-based system, the discovery burst is transmission(s) initiated by the base station, including PSS, SSS, and cell-specific RS (CRS), and may further include non-zero power CSI-RS. A discovery burst in an NR-based system is the transmission(s) initiated by the base station, comprising at least an SS/PBCH block, CORESET for PDCCH scheduling PDSCH with SIB1, PDSCH carrying SIB1 and/or non-zero It may further include a power CSI-RS.

7 illustrates a method of occupying resources in an unlicensed band. According to regional regulations on unlicensed bands, communication nodes in unlicensed bands must determine whether other communication node(s) use channels before signal transmission. Specifically, the communication node may first perform carrier sensing (CS) before signal transmission to check whether other communication node(s) transmits a signal. A case in which it is determined that other communication node(s) does not transmit a signal is defined as CCA (Clear Channel Assessment) has been confirmed. If there is a CCA threshold set by pre-defined or higher layer (eg, RRC) signaling, the communication node determines the channel state as busy if energy higher than the CCA threshold is detected in the channel, otherwise the channel state can be considered as idle. For reference, in the Wi-Fi standard (802.11ac), the CCA threshold is defined as -62 dBm for a non-Wi-Fi signal and -82 dBm for a Wi-Fi signal. If it is determined that the channel state is idle, the communication node may start transmitting a signal in the UCell. The above-described series of procedures may be referred to as LBT (Listen-Before-Talk) or CAP (Channel Access Procedure). LBT, CAP, and CCA can be mixed.

Specifically, for downlink reception/uplink transmission in an unlicensed band, one or more of the CAP methods to be described below may be used in a wireless communication system associated with the present invention.

Downlink signal transmission method through unlicensed band

The base station may perform one of the following unlicensed band access procedures (eg, Channel Access Procedure, CAP) for downlink signal transmission in the unlicensed band.

(1) Type 1 downlink CAP method

In the Type 1 DL CAP, the length of a time interval spanned by a sensing slot sensed as idle before transmission(s) is random. Type 1 DL CAP can be applied to the following transmission.

- initiated by the base station, comprising (i) a unicast PDSCH with user plane data, or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data ) transmission(s), or

- Transmission(s) initiated by the base station, either (i) with a discovery burst only, or (ii) with a discovery burst multiplexed with non-unicast information.

8 is a flowchart of a CAP operation for transmitting a downlink signal through an unlicensed band of a base station.

Referring to FIG. 8 , the base station first _{senses whether a channel is idle during a sensing slot period of a delay duration T d} , and then, when the counter N becomes 0, transmission may be performed ( S1234 ). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period(s) according to the procedure below:

Step 1) (S1220) Set N=N _init . Here, N _init is a random value uniformly distributed between 0 and CW _p. Then go to step 4.

Step 2) (S1240) If N>0 and the base station chooses to decrement the counter, set N=N-1.

Step 3) (S1250) The channel is sensed during the additional sensing slot period. At this time, if the additional sensing slot section is idle (Y), the process moves to step 4. If not (N), go to step 5.

Step 4) (S1230) If N=0 (Y), the CAP procedure is terminated (S1232). Otherwise (N), go to step 2.

Step 5) (S1260) additional delay interval T _d in the busy (busy) detected or sensed slot in sensing the channel until all sensing slot in a further delay interval T _d to be detected with the rest (idle).

Step 6) (S1270) If the channel is sensed as idle during all sensing slot periods of the _{additional delay period T d (Y), the process moves to step 4.} If not (N), go to step 5.

Table 4 Minimum m _p, which is applied to the CAP according to the channel access priority class contention window (Contention Window, CW), the maximum CW, the maximum channel occupation time (Maximum Channel Occupancy Time, MCOT) and permitted CW size (allowed CW sizes) are different.

[Table 4]

The delay interval T _d is configured in the order of interval T _f (16us) + m _p consecutive sensing slot intervals T _{sl (9us).} T _{f includes a sensing slot period T sl} at the start time of the 16us period.

CW _min,p <= CW _p <= CW _max,p . CW _p is set as CW _p = CW _min,p , and may be updated before step 1 based on HARQ-ACK feedback (eg, ACK or NACK ratio) for the previous DL burst (eg, PDSCH) (CW size update). For example, CW _{p may be initialized to CW min,p} based on the HARQ-ACK feedback for the previous DL burst, may be increased to the next highest allowed value, or the existing value may be maintained.

(2) Type 2 downlink (DL) CAP method

The length of a time interval spanned by a sensing slot sensed as idle before transmission(s) in a Type 2 DL CAP is deterministic. Type 2 DL CAPs are classified into Type 2A/2B/2C DL CAPs.

Type 2A DL CAP can be applied to the following transmission. In the Type 2A DL CAP, the base station may transmit transmission immediately after the channel is sensed as idle for _{at least the sensing period T short_dl = 25us.} Here, T _{short_dl} consists of a section T _f (=16us) and one sensing slot section immediately following. Tf includes a sensing slot at the beginning of the interval.

- transmission(s) initiated by the base station, either (i) with a discovery burst only, or (ii) with a discovery burst multiplexed with non-unicast information, or;

- Transmission(s) of the base station after a 25us gap from the transmission(s) by the terminal within the shared channel occupancy.

Type 2B DL CAP is applicable to transmission(s) performed by a base station after a 16us gap from transmission(s) by a terminal within a shared channel occupation time. In Type 2B DL CAP, the base station may transmit transmission immediately after the channel is sensed as idle for _{T f =16us.} T _f includes a sensing slot within the last 9us of the interval. Type 2C DL CAP is applicable to transmission(s) performed by a base station after a maximum of 16us gap from transmission(s) by a terminal within a shared channel occupation time. In Type 2C DL CAP, the base station does not sense the channel before performing transmission.

Uplink signal transmission method through unlicensed band

The UE performs type 1 or type 2 CAP for uplink signal transmission in the unlicensed band. In general, the terminal may perform a CAP (eg, type 1 or type 2) configured by the base station for uplink signal transmission. For example, the UE may include CAP type indication information in a UL grant for scheduling PUSCH transmission (eg, DCI formats 0_0, 0_1).

(1) Type 1 Uplink (UL) CAP Method

In the Type 1 UL CAP, the length of a time interval spanned by a sensing slot sensed as idle before transmission(s) is random. Type 1 UL CAP may be applied to the following transmission.

- Scheduling and / or configured (configured) PUSCH / SRS transmission (s) from the base station

- Scheduling and/or configured PUCCH transmission(s) from the base station

- Transmission(s) related to RAP (Random Access Procedure)

9 is a flowchart illustrating a Type 1 CAP operation of a UE for uplink signal transmission.

Referring to FIG. 9 , the terminal first _{senses whether the channel is idle during a sensing slot period of a delay duration T d} , and then, when the counter N becomes 0, transmission may be performed ( S1534 ). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period(s) according to the procedure below:

Step 1) (S1520) Set N=N _init . Here, N _init is a random value uniformly distributed between 0 and CW _p. Then go to step 4.

Step 2) (S1540) If N>0 and the terminal chooses to decrement the counter, set N=N-1.

Step 3) (S1550) The channel is sensed during the additional sensing slot period. At this time, if the additional sensing slot section is idle (Y), the process moves to step 4. If not (N), go to step 5.

Step 4) (S1530) If N=0 (Y), the CAP procedure is terminated (S1532). Otherwise (N), go to step 2.

Step 5) (S1560) The channel is sensed until a busy sensing slot is detected within the additional delay period Td or all sensing slots within the additional delay period Td are detected as idle.

Step 6) (S1570) If the channel is sensed as idle during all sensing slot sections of the additional delay section Td (Y), the process moves to step 4. If not (N), go to step 5.

Table 5 illustrates that a m _p, a minimum CW, the maximum CW, the maximum channel occupation time (Maximum Channel Occupancy Time, MCOT) and permitted CW size (allowed CW sizes) that are applied to the CAP according to the channel access priority classes differ .

[Table 5]

The delay interval T _d is configured in the order of interval T _f (16us) + m _p consecutive sensing slot intervals T _{sl (9us).} T _f includes the sensing slot period Tsl at the start of the 16us period.

CW _min,p <= CW _p <= CW _max,p . CW _p is set as CW _p = CW _min,p , and may be updated before step 1 (CW size update) based on an explicit/implicit reception response to a previous UL burst (eg, PUSCH). For example, CW _{p may be initialized to CW min,p} based on an explicit/implicit reception response to a previous UL burst, may be increased to the next highest allowed value, or the existing value may be maintained.

(2) Type 2 uplink (UL) CAP method

In the Type 2 UL CAP, the length of a time interval spanned by a sensing slot sensed as idle before transmission(s) is deterministic. Type 2 UL CAPs are classified into Type 2A/2B/2C UL CAPs. In Type 2A UL CAP, the UE may transmit transmission immediately after the channel is sensed as idle for _{at least the sensing period T short_dl = 25us.} Here, T _{short_dl} consists of a period Tf (=16us) and one sensing slot period immediately following. In Type 2A UL CAP, T _f includes a sensing slot at the start point of the interval. In Type 2B UL CAP, the UE may transmit transmission immediately after the channel is sensed as idle during the sensing period _{T f =16us.} In Type 2B UL CAP, T _f includes a sensing slot within the last 9us of the interval. In Type 2C UL CAP, the UE does not sense a channel before performing transmission.

2. Carrier group setting in unlicensed band

The above salpin contents (NR frame structure, U-Band system, etc.) may be applied in combination with the methods proposed in the present invention to be described later, or may be supplemented to clarify the technical characteristics of the methods proposed in the present invention. .

In addition, the methods to be described later can be equally applied to the above-described NR system (licensed band) or U-Band system (unlicensed band), and are defined in each system so that the technical idea proposed in this specification can be implemented in the corresponding system as well. Of course, it can be modified or replaced to fit the terms, expressions, structures, etc.

For example, downlink transmission through methods to be described below may be performed in an L-cell and/or a U-cell defined in the U-Band system.

In this specification, 'unlicensed band' may be replaced and mixed with 'shared spectrum'.

As described above, in the NR system, OFDM(A) numerology (eg, SCS, CP length, etc.) may be set differently between a plurality of cells merged into one user equipment (UE). . The maximum operating bandwidth of the terminal may be determined differently according to the SCS. Among them, in the case of an NR system operating at 52.6 GHz or less, SCS of 60 kHz and 120 kHz can be used. The maximum operating bandwidth is defined as 400 MHz.

A higher frequency band than the FR1 and FR2 bands (e.g., the 52.6 GHz ~ 114.25 GHz band, particularly 52.6 GHz ~ 71 GHz) may be referred to as FR3. Waveforms, SCS, CP length, timing, etc. defined for FR1 and FR2 in the existing NR system may not be applied to FR3.

According to the conventional NR system, the largest SCS value defined for use in FR2 is 240 kHz. If 240 kHz SCS is used in FR3 band, a problem may not occur for a specific signal/channel (eg, SS block), but phase noise may not occur for other specific signals/channels (eg, CORESET#0 and subsequent signals/channels, etc.) (phase noise) may be generated. A larger SCS (e.g., 480 kHz SCS) may be required to address this.

In the 60/70 GHz band, SCS of 480 kHz and 960 kHz are additionally introduced to the control and data channels, and in this case, the maximum operating bandwidth may be defined as 2000 MHz or more.

In FR3, when the operating bandwidth of each carrier does not match the channel size (eg, 2.16 GHz for WiGig) of another system (eg, WiGig) or the size difference is large, between the NR system and other systems For mutual coexistence, it is necessary to set a plurality of carriers as one carrier group in a band unit corresponding to the channel size of another system. When the other system is WiGig, a plurality of carriers is configured as one carrier group aligned with the 2.16 GHz band. The terminal and/or the base station may perform operations in units of carrier groups.

Through the carrier group unit operation, instead of control signals to be individually indicated for each carrier, only a single control signal is transmitted to the terminal, and the transmitted single control signal can be shared and applied in a group unit. That is, by reducing the number of control channels used for a specific purpose, it is possible to increase the resource efficiency between the base station and the terminal as a result. On the other hand, if the scheduling of data channels of all carriers belonging to a specific carrier group is operated in a group unit, resource efficiency between the base station and the terminal can be increased through the reduction of the control channel. In addition, in the case of group-based and/or based scheduling, by setting carriers constituting a specific group in various ways, it is possible to additionally provide flexibility to the scheduling operation. For example, by matching a specific group with the LBT BW unit of another system, the NR data channel scheduling operation may be possible through a single control signal while matching OCB (occupied channel bandwidth) between different systems. In this case, since the channel size of the carrier group corresponds to the channel size of the other system, the error between the systems can be reduced when the NR system and the other system use a band of a coexisting frequency (e.g., 52.6 GHz or less). As another example, a scheduling operation using data channels in different states through a single control signal may be possible by setting the distance of each carrier constituting a specific group to be spaced apart by the LBT BW size of another system. Different states may mean, for example, whether data channels are receivable or not.

Hereinafter, for convenience of explanation, a specific band of the NR system corresponding to the channel size of another system is a reference LBT BW (Reference LBT Bandwidth) or reference BW, a carrier group is a CS (carrier set), and each of the carriers in the CS is CC (component carrier).

In addition, the reference LBT BW may be set to be the same as the channel size of other systems, or may be set through higher layer signaling or the like. Another system may be, for example, WiGig. If the reference LBT BW is set to be the same as the channel size of the WiGig system, the size of the reference LBT BW becomes 2.16 GHz. Higher layer signaling may include MAC, RLC, PDCP, RRC and/or SDAP signaling. In addition, the CS and the CC group belonging to each CS can be set by the UE itself without separate signaling according to a pre-defined set of reference BWs and/or boundaries. Alternatively, the CS and the CC group belonging to each CS may be set in the terminal through higher layer signaling by the base station, or the like.

2.1. How to share and apply carrier group unit and/or based control information (DL reception availability and COT duration)

In the conventional Rel-15 NR system, it is possible to indicate a slot format indicator (SFI) that dynamically adjusts D/U/F (downlink/uplink/flexible) for each symbol through DCI format 2_0. In this specification, the phrase 'indicate' or 'instructable' may mean that the base station and/or the network transmits certain information to the terminal or it is possible to transmit the information. In addition, in the Rel-16 NR-U system, the base station performs LBT for each unit BW (LBT BW or RB set, eg, 20 MHz) requiring individual LBT between carriers or within a carrier through DCI format 2_0, and based on this , there is an indication of DL availability for each carrier or for each unit BW within a carrier, channel occupancy time (COT), and/or search space set group switching. possible. That is, in the NR system, the base station provides the terminal with SFI for each carrier, whether DL reception is possible (or whether DL reception is possible for each unit BW in the carrier), COT length (duration) value, and/or control information for search space set group switching. It can be informed by DCI format 2_0.

An indicator indicating whether DL reception is possible on a specific frequency (or RB) (or whether DL reception is possible for each unit BW in a carrier) may be an Available RB set indicator. An indicator indicating a COT length value may be a COT duration indicator. An indicator indicating whether to switch the search space set group may be a search space set group switching flag.

SFI, DL reception availability (or DL reception availability for each unit BW in a carrier), a COT length value, and/or control information for search space set group switching may be referred to as parameters, respectively.

Meanwhile, in the case of an NR system operating in a frequency band requiring coexistence with other systems, the reference BW is defined differently from the RB set in the prior art as described above. A plurality of carriers belonging to (or corresponding to) the reference BW are selected so that whether it is possible to transmit/receive control and data channels based on the same control information for all the plurality of carriers belonging to (or aligned with the reference BW) can be determined. It is set to one CS, and control information may be utilized in units of CS.

Hereinafter, information utilization methods in CS units are proposed.

[Method #1-1] For each CC belonging to the CS, information such as SFI/DL reception availability/channel occupancy time is transmitted through the PDCCH (transmitted on each CC), and the terminal receives the information received from each CC. How to share/apply information to other CCs belonging to the same CS

The base station individually provides control information for SFI, DL reception availability (or DL reception availability for each unit BW in the carrier), COT length, and/or search space set group switching for each CC belonging to one CS to the terminal. can be directed to The indication may be transmitted through a PDCCH transmitted on each CC. The PDCCH may include DCI format 2_0. When the UE receives the corresponding information for at least one CC among CCs belonging to the same CS (or on at least one CC), the UE may share/apply the received information to all CCs belonging to the same CS.

More specifically, the base station may transmit an independent PDCCH (on each CC) for each of all CCs belonging to one CS. The base station may transmit the PDCCH only for a specific part (eg, one or more) CCs (only on the CC). The UE may apply the information received for each CC only to the corresponding CC, and the PDCCH information received for at least one CC (or on at least one CC) is commonly applied to all CCs belonging to the same CS. You may.

For example, in a situation in which CC#1, CC#2, and CC#3 are configured with CSs corresponding to one reference BW, CC#1 succeeds in LBT and the terminal receives an indication that DL reception is possible is CC#2 and CC#3 also recognizes that DL reception is possible, and can perform PDCCH monitoring in all of CC#1, CC#2, and CC#3. As another example, a terminal that receives SFI information for a specific section for CC#2 or receives information on the COT length applies the information equally to CC#1 and CC#3, which are other CCs in the CS. can

[Method #1-2] A PDCCH is transmitted (on the corresponding CC) for one specific representative CC belonging to the CS, and the UE shares/applies control information in the corresponding PDCCH to all CCs included in the CS to which the CC belongs. How to

Whether the base station can receive SFI, DL through PDCCH (and/or DCI format 2_0) only for one specific representative CC belonging to the CS (only on the corresponding CC) (or whether DL reception is possible for each unit BW in the carrier), COT Control information for length and/or search space set group switching is transmitted to the terminal. The UE may operate to equally apply the corresponding information to all CCs in the CS to which the corresponding CC belongs.

The representative CC through which the base station/terminal transmits/receives the PDCCH may be a CC predefined or configured for each CS. Alternatively, the representative CC may be one available CC that may be dynamically configured according to the situation of a channel and/or a scheduler. For example, the available CC may be a CC having the lowest cell index in the CS, or a CC having the lowest cell index while in an active state in the CS. Alternatively, in the case of control information (parameter), it may be transmitted as information on a CS unit rather than information on a specific CC.

As an example, for a case in which a specific CS consists of CC#1, CC#2, and CC#3, even if a PDCCH (or DCI format 2_0) including control information is received on any CC belonging to the CS, the control information is The CS itself, that is, all CCs within the CS, that is, CC#1, CC#2, and CC#3, can be shared and commonly applied.

[ Method #1-3] How to share/apply search space set group switching information for all CCs belonging to CS

In the conventional system, the search space set group switching operates as shown in Tables 6 and 7 below.

Search space set group switching A UE can be provided a group index for a respective Type3-PDCCH CSS set or USS set by searchSpaceGroupIdList-r16 for PDCCH monitoring on a serving cell. If the UE is not provided searchSpaceGroupIdList-r16 for a search space set, the following procedures are not applicable for PDCCH monitoring according to the search space set. If a UE is provided searchSpaceSwitchingGroupList-r16 , indicating one or more groups of serving cells, the following procedures apply to all serving cells within each group; otherwise, the following procedures apply only to a serving cell for which the UE is provided searchSpaceGroupIdList-r16 . When a UE is provided searchSpaceGroupIDList-r16 , the UE resets PDCCH monitoring according to search space sets with group index 0, if provided by searchSpaceGroupIdList-r16 . A UE can be provided by searchSpaceSwitchingDelay-r16 a number of symbols P switch where a minimum value of P switch is provided in Table 7 for UE processing capability 1 and UE processing capability 2 and SCS configuration μ. UE processing capability 1 for SCS configuration applies unless the UE indicates support for UE processing capability 2. A UE can be provided, by searchSpaceSwitchingTimer-r16 , a timer value for a serving cell that the UE is provided searchSpaceGroupIdList-r16 or, if provided, for a set of serving cells provided by searchSpaceSwitchingGroupList-r16 . The UE decrements the timer value by one after each slot based on a reference SCS configuration that is the smallest SCS configuration μ among all configured DL BWPs in the serving cell, or in the set of serving cells. The UE maintains the reference SCS configuration during the timer decrement procedure. If a UE is provided by SearchSpaceSwitchTrigger-r16 a location of a search space set group switching flag field for a serving cell in a DCI format 2_0, as described in Clause 11.1.1; if the UE detects a DCI format 2_0 and a value of the search space set group switching flag field in the DCI format 2_0 is 0, the UE starts monitoring PDCCH according to search space sets with group index 0, and stops monitoring PDCCH according to search space sets with group index 1, on the serving cell at a first slot that is at least P switch symbols after the last symbol of the PDCCH with the DCI format 2_0 if the UE detects a DCI format 2_0 and a value of the search space set group switching flag field in the DCI format 2_0 is 1, the UE starts monitoring PDCCH according to search space sets with group index 1, and stops monitoring PDCCH according to search space sets with group index 0, on the serving cell at a first slot that is at least P switch symbols after the last symbol of the PDCCH with the DCI format 2_0, and the UE sets the timer value to the value provided by searchSpaceSwitchingTimer-r16 if the UE monitors PDCCH on a serving cell according to search space sets with group index 1, the UE starts monitoring PDCCH on the serving cell according to search space sets with group index 0, and stops monitoring PDCCH according to search space sets with group index 1, on the serving cell at the beginning of the first slot that is at least P switch symbols after a slot where the timer expires or after a last symbol of a remaining channel occupancy duration for the serving cell that is indicated by DCI format 2_0 If a UE is not provided SearchSpaceSwitchTrigger-r16 for a serving cell, if the UE detects a DCI format by monitoring PDCCH according to a search space set with group index 0, the UE starts monitoring PDCCH according to search space sets with group index 1, and stops monitoring PDCCH according to search space sets with group index 0, on the serving cell at a first slot that is at least P switch symbols after the last symbol of the PDCCH with the DCI format, the UE sets the timer value to the value provided by searchSpaceSwitchingTimer-r16 if the UE detects a DCI format by monitoring PDCCH in any search space set if the UE monitors PDCCH on a serving cell according to search space sets with group index 1, the UE starts monitoring PDCCH on the serving cell according to search space sets with group index 0, and stops monitoring PDCCH according to search space sets with group index 1, on the serving cell at the beginning of the first slot that is at least P switch symbols after a slot where the timer expires or, if the UE is provided a search space set to monitor PDCCH for detecting a DCI format 2_0, after a last symbol of a remaining channel occupancy duration for the serving cell that is indicated by DCI format 2_0 A UE determines a slot and a symbol in the slot to start or stop PDCCH monitoring according to search space sets for a serving cell that the UE is provided searchSpaceGroupIdList-r16 or, if searchSpaceSwitchingGroupList-r16 is provided, for a set of serving cells, based on the smallest SCS configuration μ among all configured DL BWPs in the serving cell or in the set of serving cells and, if any, in the serving cell where the UE receives a PDCCH and detects a corresponding DCI format 2_0 triggering the start or stop of PDCCH monitoring according to search space sets.

μ	Minimum P switch value for UE processing capability 1 [symbols]	Minimum P switch value for UE processing capability 2 [symbols]
0	25	10
One	25	12
2	25	22

As in method #1-1, the base station transmits a search space set group switching flag through a PDCCH (transmitted on each CC) for each CC belonging to one CS. The UE may share information received from each CC to other CCs belonging to the same CS and apply it in common.

Alternatively, as in Method #1-2, the CC (representative CC) to which the search space set group switching flag is transmitted is preset for each CS, and the search space set group switching flag may be transmitted through the PDCCH transmitted on the CC. have. The UE may perform a switching operation according to the received flag for all CCs belonging to the CS.

The search space set group switching operation is performed equally for all CCs belonging to the CS, and the method of applying the flag delivered to each CC to all the CCs belonging to the CS includes Method #1-1 and Method #1-2 It can be set in various ways. For example, when the flag is received from at least one CC, a switching operation may be performed for all CCs of the CS including the corresponding CC. As another example, when a flag is received from more than half of the CCs belonging to the CS (or when a flag is received from more than a certain number of CCs belonging to the CS), a switching operation may be performed for all CCs constituting the CS. . A criterion for performing a switching operation for each CS may be set through higher layer signaling.

Including the search space set group switching flag, the SFI, Available RB set Indicator, and/or COT duration indicator can also be applied to all CCs constituting the CS when the corresponding parameter is received from a certain number of CCs or more belonging to the CS. have.

In addition, the setting of a timer (Timer) for switching or reverse-switching the search space set group may also be shared and/or applied to CCs belonging to the CS. One or more timers can be set for each CS (depending on the setting). An operation method including timer set/reset may be equally applied to CCs belonging to each CS according to a sharing and/or application method of search space set group switching.

Also, search space set group switching may be performed even if the search space set group switching flag is not set. Even in this case, the search space set group switching operation may be equally applied to all CCs belonging to the CS (even if the CCs are not explicitly set as a cell group for SS set group switching).

Method #1-3 may be applied only to CCs for which a search space set group is configured among CCs belonging to Opt1) CS, or Opt2) Even if a search space set group is configured for only one CC in a CS, all It can be applied to CCs. In the case of Opt2), a rule may be defined so that search space sets in a CC where a search space set group is not set have a specific group index (eg, index 0) value.

2.2. Carrier group unit/based DL/UL data (e.g., PDSCH/PUSCH) scheduling method

The NR system performs scheduling between different CCs (e.g., DCI transmitted on a specific CC with DCI transmitted on a specific CC on another CC for the purpose of reducing DCI size, reducing interference between control channels, providing scheduling flexibility, etc.) during PDSCH and/or PUSCH scheduling. It provides a method of scheduling PDSCH/PUSCH transmission), that is, a cross-carrier scheduling method. Cross-carrier scheduling may be applied to an NR system that coexists with WiGig in the 60/70 GHz band, particularly an NR system that supports the carrier group (CS)-based operation proposed in this specification. In this case, the CS can be configured in two different ways according to the setting of the CCs constituting the CS. Specifically, one CS may be configured as CCs contiguous on a frequency corresponding to a reference (LBT) BW unit. One CS composed of contiguous CCs in the frequency domain may be referred to as a “contiguous CS”. Alternatively, one CS may be configured with CCs that are non-contiguous in frequency regardless of the reference (LBT) BW unit. One CS composed of non-contiguous CCs in the frequency domain may be referred to as a “non-contiguous CS”.

Hereinafter, a CS-based/unit scheduling method according to each scheme is proposed.

[Method #2-1] Scheduling method based on contiguous CS configuration

One CS may be composed of consecutive CCs on a frequency corresponding to a single reference (LBT) BW unit. In this case, individual scheduling and HARQ feedback may be performed for each CC. The following CS unit scheduling scheme may be possible. DCI scheduled for each method may include a carrier indicator field (CIF) and/or a carrier-set indicator field (CSIF).

[Method#2-1-1]: Self-CS/Self-CC Scheduling Method

A self-CC (Self-CC) scheduling method may be applied to one CC belonging to the CS. Self-CC scheduling is a method in which the CC itself schedules data channel transmission in a specific CC. In a specific embodiment, a PDCCH (or DCI) is transmitted in CC#A and data channel transmission in CC#A in which the corresponding PDCCH (or DCI) is the same may be scheduled. In this case, since there is no need to consider other CCs and other CSs, the CIF and/or CSIF fields in DCI may not be defined.

[Method#2-1-2]: Self-CS/Cross-CC Scheduling Method

A cross-CC scheduling method may be applied between a plurality of CCs belonging to the same CS. Cross-CC scheduling is a method of scheduling data channel transmission in a specific CC in another CC belonging to the same CS. In a specific embodiment, data channel transmission in another CC#B belonging to the same CS may be scheduled through a PDCCH (or DCI) transmitted in CC#A. In another embodiment, in CC#A, CC#A and CC#B (via one PDCCH (or DCI)) are simultaneously scheduled (or multiple CCs in CC#A through one PDCCH (or DCI)) Simultaneous scheduling) may also be possible with multi-CC scheduling. In this method, the CIF field is defined in DCI, and the CIF may indicate different CCs. As a specific embodiment, it is assumed that a 3-bit CIF field is included in the DCI transmitted from CC#A, and when indicating a CC scheduled according to each CIF field value, the CIF-to-CC mapping relationship is set as shown in Table 8 can be

000: Indicate to CC#A (in this case, same as self-CC scheduling) 001: Indicate to CC#B 010: Indicate to CC#C 011: Indicate to CC#D 100: Indicate to both CC#A and CC#B else: Reserved for future use

The CIF-to-CC mapping relationship may be semi-statically configured by higher layer signaling. Alternatively, the meaning of the CIF field value may be set in other ways.

In addition, the PDCCH candidate (candidate) related parameters monitored by the UE (eg, the PDCCH candidate start position and/or index set available for each CC/cell scheduling, etc.) are CIF values set through RRC or indicated in DCI. It may be determined based on the CIF field value, or may be set by a separate mapping relationship using the CIF field value.

3) [Method#2-1-3]: Cross-CS Scheduling Method

A cross-CC scheduling method may be considered for a plurality of CCs belonging to different CSs. Cross-CS scheduling is a method of scheduling data channel transmission in a specific CC belonging to a specific CS in another specific CC belonging to another specific CS. As a specific embodiment, data channel transmission in CC#B belonging to CS#Y may be scheduled through a PDCCH (or DCI) transmitted in CC#A belonging to CS#X. In another embodiment, CC#A belonging to CS#X and CC#B belonging to CS#Y are simultaneously scheduled through one PDCCH (or DCI) transmitted from CC#A belonging to CS#X (or the CC Multi-CC scheduling (for simultaneously scheduling a plurality of CCs belonging to CS#X and/or CS#Y) may be performed through one PDCCH (or DCI) transmitted from #A. In the case of method #2-1-3, a CIF field and/or a CSIF field may be included in the DCI, and the CIF field and/or the CSIF field may indicate different CSs and different CCs. Alternatively, the CC indication may be indicated through the CIF field in the DCI, and the CS indication may be indicated using another field in the corresponding DCI. A specific embodiment of a case in which both CIF and CSIF are included in DCI and operated may be as follows. For example, a 3-bit CIF field and a 3-bit CSIF field are included in DCI transmitted from CC#A belonging to CS#X, and a scheduled CS and a scheduled CC can be indicated using the CIF and CSIF values. . In the above embodiment, the CIF-to-CC mapping relationship may be similar to the CIF-to-CC mapping relationship described in [Method #2-1-2]. The CSIF-to-CS mapping relationship may be semi-statically established by higher layer signaling such as RRC. Alternatively, a meaning for each CSIF value may be defined in another way. More specifically, the CSIF-to-CS mapping relationship may be set as shown in Table 9 below.

000: Indicate to CS#X (in this case, it means self-CS) 001: Indicate to CS#Y 010: Indicate to CS#Z 100: Indicate to both CS#X and CS#Y else: Reserved for future use

In addition, the PDCCH candidate related parameters monitored by the UE (eg, the PDCCH candidate start position and index set available for each CC/cell scheduling, etc.) are set through RRC with the CIF value and/or the CSIF value (or the CIF value and the It may be determined based on a combination of CSIF values) or a CIF field value and/or a CSIF field value (or a combination of a CIF value and a CSIF value) indicated in DCI, or a CIF and/or a CSIF field value (or a CIF value and a CSIF value) It may be set by a separate mapping relationship using a combination of values).

Meanwhile, both the CIF and CSIF fields may be included in the DCI, or only a part of the CIF field or the CSIF field may be included. When both the CIF and CSIF fields are included, the CIF and CSIF fields may be independently configured according to the above-described mapping relationship, or the CIF and CSIF fields may be jointly configured. The mapping relationship for this case may be set, for example, as follows.

000: Indicate to CC#A in CS#X 001: Indicate to CC#B in CS#Y 010: Indicate to CC#C in CS#Z 100: Indicate to both CC#A in CS#X and CC#B in CS#Y ...

In addition, for the purpose of reducing the control channel information, in the proposed method, a limitation in the configuration between CS and/or CC may be considered. For example, if CS#X is configured with {CC#A1,CC#A2} and CS#Y is configured with {CC#B1,CC#B2}, CS#X schedules CS#Y. When configured, one CC belonging to CS#Y may be scheduled from only one specific CC belonging to CS#X. For example, it may be scheduled as (CC#A1 -> CC#B1, CC#A2 -> CC#B2). PDCCH SSs for CC#A1 and CC#B1 may be configured on CC#A1, and PDCCH SSs for CC#A2 and CC#B2 may be configured on CC#A2. For better understanding, the case where there is no setting limit between CS/CC is described with the same CS#X and CS#Y configuration as above. When CS#X is set to schedule CS#Y, it belongs to CS#Y One CC may be configured to be schedulable from all or specific one or more CCs belonging to CS#X. For example, CC#B1 in CS#Y may have a scheduling relationship with both CC#A1 and CC#A2 in CS#X. For example, a scheduling relationship may be established as {CC#A1 -> CC#B1, CC#A1 -> CC#B2, CC#A2 -> CC#B1, CC#A2 -> CC#B2). . A PDCCH SS for CC#A1/B1/B2 may be configured on CC#A1, and a PDCCH SS for CC #A2/B1/B2 may be configured on CC#A2.

Additionally, as another embodiment for the purpose of reducing control channel information, the CIF field is not included in the DCI, only the CSIF field is included, and a CC scheduled using only the CSIF-to-CS mapping relationship may be indicated. For example, in a situation where the number of CCs constituting each CS is set to be the same, when cross-CS scheduling is performed through DCI in a specific CC belonging to a specific CS, it is scheduled through a CSIF-to-CS mapping relationship. CS may be indicated. When the position of the scheduled CC in the corresponding CS is restricted to be the same as the relative position of the scheduling-CC among CCs in the scheduling-CS, the CS and the CC may be scheduled without a separate definition of the CIF field.

[Method #2-2] Scheduling method based on non-contiguous CS configuration

As another method of CS-based scheduling, one CS may be configured as non-contiguous CCs in frequency. In this case, the interval between each CC constituting one CS may be set to be greater than or equal to a single reference (LBT) BW unit. As an embodiment for this case, the CS configuration shown in Table 11 may be used.

CS#X={CC#X1, CC#X2, CC#X3} CS#Y={CC#Y1, CC#Y2, CC#Y3} CS#Z={CC#Z1, CC#Z2, CC#Z3}

In the above configuration, the CCs are consecutive CCs in the order of {CC#X1, CC#Y1, CC#Z1, CC#X2, CC#Y2, CC#Z2, CC#X3, CC#Y3, CC#Z3} in the frequency domain. where {CC#X1, CC#Y1, CC#Z1}, {CC#X2, CC#Y2, CC#Z2}, {CC#X3, CC#Y3, CC#Z3} are each single reference (LBT) may correspond to units of BW. Also, the interval between the x-th CCs of each CS (eg, the interval between CC#X1 and CC#Y1) may be the same as a single reference (LBT) BW unit. In method #2-2, individual scheduling and HARQ feed may be performed for each CC. The following CS unit scheduling scheme may be possible.

1) [Method #2-2-1]: Self-CS/Self-CC scheduling method

- Operation based on [Method #2-1-1]

2) [Method #2-2-2]: Self-CS/Cross-CC scheduling method

- Action based on [Method #2-1-2]

3) [Method #2-2-3]: Cross-CS Scheduling Method

- Action based on [Method #2-1-3]

In one embodiment for method #2-2, if considering the operation of multi-CC scheduling a plurality of CCs with one DCI, if the scheduled CCs belong to different reference LBT BW units, the scheduled CCs The probability of occurrence of the worst situation such as DL reception not being all information on whether DL reception is possible or channel occupancy time may be reduced. As another embodiment for method #2-2, the probability of occurrence of the worst situation such as not receiving all DL scheduling/scheduled CC by cross-carrier scheduling so that the scheduling CC and the scheduled CC do not belong to one reference LBT BW this can be reduced

implementation

10 is a flowchart of a signal transmission/reception method according to embodiments of the present invention.

Referring to FIG. 10 , embodiments of the present invention may be performed by a terminal, and setting a carrier group including a plurality of CCs (S1001) and receiving DCI on a specific CC within the carrier group (S1003) It may be composed of

The received DCI may be a DCI of DCI format 2_0 as described in Section 2.1 of this specification.

When the received DCI is DCI format 2_0, one or more parameters included in the DCI may be used for all CCs in the carrier group by one of the methods of clause 2.1.

For example, according to method #1-1, a specific CC through which DCI is transmitted may be a CC arbitrarily selected by the base station from among CCs belonging to a carrier group. According to method #1-1, a specific CC to which DCI is transmitted may be independently determined from among CCs included in a carrier group whenever DCI is transmitted.

Alternatively, according to method #1-1, a specific CC through which DCI is transmitted may be all CCs belonging to a carrier group. The base station transmits DCI in all CCs belonging to the carrier group, but the terminal may use one or more parameters included in the DCI for all CCs even if the terminal receives the DCI only from a specific CC among the CCs belonging to the carrier group.

According to method #1-2, DCI having DCI format 2_0 may be received only from the specific CC among CCs included in the carrier group. The specific CC may be a CC preset by DCI and/or higher layer signaling. Also, the specific CC may be a CC having the lowest index among CCs in the carrier group. Also, the specific CC may be a CC having the lowest index among activated CCs in the carrier group. The base station transmits DCI of DCI format 2_0 only through a specific CC, and the UE may operate in expectation of receiving DCI of DCI format 2_0 only through a specific CC.

According to Method #1-3, one or more parameters may be used for all CCs in the carrier group based on the received DCI format 2_0 on the number of CCs equal to or greater than the threshold among all CCs in the carrier group. If DCI with DCI format 2_0 is received on the number of CCs less than the threshold, one or more parameters may be applied only to CCs for which DCI was received. In addition, if DCI with DCI format 2_0 is received on the number of CCs less than the threshold, one or more parameters may not be applied to any CC in the carrier group.

The one or more parameters may include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information on a search space set group switching.

As described in Method #1-3, a timer for search space set group switching may be used for all CCs in the carrier group. One or more timers may be set for each carrier group.

The carrier group may be set based on the reference LBT BW. The reference LBT BW may be set based on the LBT band of a communication system other than the wireless communication system to which the carrier group belongs. The wireless communication system may be, for example, an LTE and/or NR system. Another communication system may be a communication system other than LTE and/or NR systems. Alternatively, the carrier group may be configured in a wireless communication system to which the carrier group belongs regardless of other communication systems.

In addition, DCI for uplink and/or downlink scheduling of the UE may be received together with or independently of uplink configuration based on DCI format 2_0. A specific scheduling method may be configured by a combination of one or more of the operations described in Section 2.2 of this specification.

In addition to the operations described with reference to FIG. 10 , the operations described with reference to FIGS. 1 to 9 and/or one or more of the operations described with reference to section 2 may be combined and further performed.

Communication system example to which the present invention is applied

Although not limited thereto, the various descriptions, functions, procedures, proposals, methods, and/or flow charts of the present invention disclosed in this document may be applied to various fields requiring wireless communication/connection (eg, 5G) between devices. have.

Hereinafter, it will be exemplified in more detail with reference to the drawings. In the following drawings/descriptions, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise indicated.

11 illustrates a communication system 1 applied to the present invention.

Referring to FIG. 11 , the communication system 1 applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a radio access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device. Although not limited thereto, the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, and a home appliance 100e. ), an Internet of Things (IoT) device 100f, and an AI device/server 400 . For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality)/VR (Virtual Reality)/MR (Mixed Reality) devices, and include a Head-Mounted Device (HMD), a Head-Up Display (HUD) provided in a vehicle, a television, a smartphone, It may be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like. The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a laptop computer), and the like. Home appliances may include a TV, a refrigerator, a washing machine, and the like. The IoT device may include a sensor, a smart meter, and the like. For example, the base station and the network may be implemented as a wireless device, and a specific wireless device 200a may operate as a base station/network node to other wireless devices.

The wireless devices 100a to 100f may be connected to the network 300 through the base station 200 . AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f , and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300 . The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may also communicate directly (e.g. sidelink communication) without passing through the base station/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. Vehicle to Vehicle (V2V)/Vehicle to everything (V2X) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensor) or other wireless devices 100a to 100f.

Wireless communication/ connection 150a, 150b, and 150c may be performed between the wireless devices 100a to 100f/base station 200 and the base station 200/base station 200 . Here, the wireless communication/connection includes uplink/downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (eg relay, IAB (Integrated Access Backhaul)). This can be done through technology (eg 5G NR) Wireless communication/ connection 150a, 150b, 150c allows the wireless device and the base station/radio device, and the base station and the base station to transmit/receive wireless signals to each other. For example, the wireless communication/ connection 150a, 150b, and 150c may transmit/receive signals through various physical channels.To this end, based on various proposals of the present invention, At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation processes, etc. may be performed.

Examples of wireless devices to which the present invention is applied

12 illustrates a wireless device that can be applied to the present invention.

Referring to FIG. 12 , the first wireless device 100 and the second wireless device 200 may transmit/receive wireless signals through various wireless access technologies (eg, LTE, NR). Here, {first wireless device 100, second wireless device 200} is {wireless device 100x, base station 200} of FIG. 11 and/or {wireless device 100x, wireless device 100x) } can be matched.

The first wireless device 100 includes one or more processors 102 and one or more memories 104 , and may further include one or more transceivers 106 and/or one or more antennas 108 . The processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or flow charts disclosed herein. For example, the processor 102 may process the information in the memory 104 to generate the first information/signal, and then transmit a wireless signal including the first information/signal through the transceiver 106 . In addition, the processor 102 may receive the radio signal including the second information/signal through the transceiver 106 , and then store the information obtained from the signal processing of the second information/signal in the memory 104 . The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102 . For example, the memory 104 may provide instructions for performing some or all of the processes controlled by the processor 102 , or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled with the processor 102 , and may transmit and/or receive wireless signals via one or more antennas 108 . The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present invention, a wireless device may refer to a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 , one or more memories 204 , and may further include one or more transceivers 206 and/or one or more antennas 208 . The processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. For example, the processor 202 may process the information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206 . In addition, the processor 202 may receive the radio signal including the fourth information/signal through the transceiver 206 , and then store information obtained from signal processing of the fourth information/signal in the memory 204 . The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202 . For example, the memory 204 may provide instructions for performing some or all of the processes controlled by the processor 202 , or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 . The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present invention, a wireless device may refer to a communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors 102 , 202 . For example, one or more processors 102 , 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 102, 202 may be configured to process one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, function, procedure, proposal, method, and/or operational flowcharts disclosed herein. can create One or more processors 102, 202 may generate messages, control information, data, or information according to the description, function, procedure, proposal, method, and/or flow charts disclosed herein. The one or more processors 102 and 202 generate a signal (eg, a baseband signal) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and/or methods disclosed in this document. , to one or more transceivers 106 and 206 . The one or more processors 102 , 202 may receive signals (eg, baseband signals) from one or more transceivers 106 , 206 , and may be described, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein. PDUs, SDUs, messages, control information, data, or information may be acquired according to the above.

One or more processors 102 , 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors 102 , 202 . The descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed in this document may be implemented using firmware or software, which may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, proposals, methods, and/or flow charts disclosed herein provide that firmware or software configured to perform is included in one or more processors 102 , 202 , or stored in one or more memories 104 , 204 . It may be driven by the above processors 102 and 202 . The descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed herein may be implemented using firmware or software in the form of code, instructions, and/or a set of instructions.

One or more memories 104 , 204 may be coupled with one or more processors 102 , 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and/or instructions. One or more memories 104 , 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. One or more memories 104 , 204 may be located inside and/or external to one or more processors 102 , 202 . In addition, one or more memories 104 , 204 may be coupled to one or more processors 102 , 202 through various technologies, such as wired or wireless connections.

One or more transceivers 106 , 206 may transmit user data, control information, radio signals/channels, etc. referred to in the methods and/or operational flowcharts of this document to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, radio signals/channels, etc. referred to in the descriptions, functions, procedures, suggestions, methods and/or flow charts, etc. disclosed herein, from one or more other devices. have. For example, one or more transceivers 106 , 206 may be coupled to one or more processors 102 , 202 and may transmit and receive wireless signals. For example, one or more processors 102 , 202 may control one or more transceivers 106 , 206 to transmit user data, control information, or wireless signals to one or more other devices. In addition, one or more processors 102 , 202 may control one or more transceivers 106 , 206 to receive user data, control information, or wireless signals from one or more other devices. Further, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 may be coupled via one or more antennas 108, 208 to the descriptions, functions, and functions disclosed herein. , procedures, proposals, methods and/or operation flowcharts, etc. may be set to transmit and receive user data, control information, radio signals/channels, and the like. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or more transceivers 106, 206 convert the received radio signal/channel, etc. from the RF band signal to process the received user data, control information, radio signal/channel, etc. using the one or more processors 102, 202. It can be converted into a baseband signal. One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 , 206 may include (analog) oscillators and/or filters.

Examples of application of wireless devices to which the present invention is applied

13 shows another example of a wireless device applied to the present invention. The wireless device may be implemented in various forms according to use-examples/services (refer to FIG. 11 ).

Referring to FIG. 13 , the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 12 , and various elements, components, units/units, and/or modules. ) can be composed of For example, the wireless devices 100 and 200 may include a communication unit 110 , a control unit 120 , a memory unit 130 , and an additional element 140 . The communication unit may include communication circuitry 112 and transceiver(s) 114 . For example, communication circuitry 112 may include one or more processors 102,202 and/or one or more memories 104,204 of FIG. 12 . For example, transceiver(s) 114 may include one or more transceivers 106 , 206 and/or one or more antennas 108 , 208 of FIG. 12 . The control unit 120 is electrically connected to the communication unit 110 , the memory unit 130 , and the additional element 140 , and controls general operations of the wireless device. For example, the controller 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130 . In addition, the control unit 120 transmits the information stored in the memory unit 130 to the outside (eg, another communication device) through the communication unit 110 through a wireless/wired interface, or through the communication unit 110 to the outside (eg, Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130 .

The additional element 140 may be configured in various ways according to the type of the wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an input/output unit (I/O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device includes a robot ( FIGS. 11 and 100a ), a vehicle ( FIGS. 11 , 100b-1 , 100b-2 ), an XR device ( FIGS. 11 and 100c ), a mobile device ( FIGS. 11 and 100d ), and a home appliance. (FIG. 11, 100e), IoT device (FIG. 11, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate/environment device, It may be implemented in the form of an AI server/device ( FIGS. 11 and 400 ), a base station ( FIGS. 11 and 200 ), and a network node. The wireless device may be mobile or used in a fixed location depending on the use-example/service.

In FIG. 13 , various elements, components, units/units, and/or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface, or at least some of them may be wirelessly connected through the communication unit 110 . For example, in the wireless devices 100 and 200 , the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130 and 140 ) are connected to the communication unit 110 through the communication unit 110 . It can be connected wirelessly. In addition, each element, component, unit/unit, and/or module within the wireless device 100 , 200 may further include one or more elements. For example, the controller 120 may be configured with one or more processor sets. For example, the controller 120 may be configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, a memory control processor, and the like. As another example, the memory unit 130 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.

Examples of vehicles to which the present invention is applied or autonomous vehicles

14 illustrates a vehicle or an autonomous driving vehicle to which the present invention is applied. The vehicle or autonomous driving vehicle may be implemented as a mobile robot, vehicle, train, manned/unmanned aerial vehicle (AV), ship, or the like.

Referring to FIG. 14 , the vehicle or autonomous driving vehicle 100 includes an antenna unit 108 , a communication unit 110 , a control unit 120 , a driving unit 140a , a power supply unit 140b , a sensor unit 140c and autonomous driving. It may include a part 140d. The antenna unit 108 may be configured as a part of the communication unit 110 . Blocks 110/130/140a-140d correspond to blocks 110/130/140 of FIG. 13, respectively.

The communication unit 110 may transmit/receive signals (eg, data, control signals, etc.) to and from external devices such as other vehicles, base stations (eg, base stations, roadside units, etc.), servers, and the like. The controller 120 may control elements of the vehicle or the autonomous driving vehicle 100 to perform various operations. The controller 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous driving vehicle 100 to run on the ground. The driving unit 140a may include an engine, a motor, a power train, a wheel, a brake, a steering device, and the like. The power supply unit 140b supplies power to the vehicle or the autonomous driving vehicle 100 , and may include a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward movement. / may include a reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, and the like. The autonomous driving unit 140d includes a technology for maintaining a driving lane, a technology for automatically adjusting speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and a technology for automatically setting a route when a destination is set. technology can be implemented.

For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The controller 120 may control the driving unit 140a to move the vehicle or the autonomous driving vehicle 100 along the autonomous driving path (eg, speed/direction adjustment) according to the driving plan. During autonomous driving, the communication unit 110 may non/periodically acquire the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c may acquire vehicle state and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on the newly acquired data/information. The communication unit 110 may transmit information about a vehicle location, an autonomous driving route, a driving plan, and the like to an external server. The external server may predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or autonomous vehicles, and may provide the predicted traffic information data to the vehicle or autonomous vehicles.

It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the characteristics of the present invention. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

As described above, the present invention can be applied to various wireless communication systems.

Claims (36)

1. In a method for a terminal to transmit and receive a signal in a wireless communication system,

   setting a carrier group including a plurality of component carriers (CCs); and

   Receiving a DCI of a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group; includes,

   One or more parameters included in the DCI are used for all CCs in the carrier group,

   How to send and receive signals.
2. According to claim 1,

   The DCI is received only in the specific CC among CCs included in the carrier group,

   How to send and receive signals.
3. According to claim 1,

   Based on the received DCI on a threshold number or more of all CCs in the carrier group, the one or more parameters are used for all CCs in the carrier group,

   How to send and receive signals.
4. According to claim 1,

   The one or more parameters include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information about a search space set group switching,

   How to send and receive signals.
5. According to claim 1,

   A timer for search space set group switching is used for all CCs in the carrier group,

   How to send and receive signals.
6. According to claim 1,

   The carrier group is set based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system,

   How to send and receive signals.
7. In a terminal for transmitting and receiving a signal in a wireless communication system,

   at least one transceiver;

   at least one processor; and

   at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation; including,

   The specific operation is

   setting a carrier group including a plurality of component carriers (CCs); and

   Receiving a DCI of a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group; includes,

   One or more parameters included in the DCI are used for all CCs in the carrier group,

   terminal.
8. 8. The method of claim 7,

   The DCI is received only in the specific CC among CCs included in the carrier group,

   terminal.
9. 8. The method of claim 7,

   Based on the received DCI on a threshold number or more of all CCs in the carrier group, the one or more parameters are used for all CCs in the carrier group,

   terminal.
10. 8. The method of claim 7,

    The one or more parameters include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information about a search space set group switching,

    terminal.
11. 8. The method of claim 7,

    A timer for search space set group switching is used for all CCs in the carrier group,

    terminal.
12. 8. The method of claim 7,

    The carrier group is set based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system,

    terminal.
13. A device for a terminal comprising:

    at least one processor; and

    at least one computer memory operatively coupled to the at least one processor and, when executed, causing the at least one processor to perform an operation, the operation comprising:

    setting a carrier group including a plurality of component carriers (CCs); and

    Receiving a DCI of a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group; includes,

    One or more parameters included in the DCI are used for all CCs in the carrier group,

    Device.
14. 14. The method of claim 13,

    The DCI is received only in the specific CC among CCs included in the carrier group,

    Device.
15. 14. The method of claim 13,

    Based on the received DCI on a threshold number or more of all CCs in the carrier group, the one or more parameters are used for all CCs in the carrier group,

    Device.
16. 14. The method of claim 13,

    The one or more parameters include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information about a search space set group switching,

    Device.
17. 14. The method of claim 13,

    A timer for search space set group switching is used for all CCs in the carrier group,

    Device.
18. 14. The method of claim 13,

    The carrier group is set based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system,

    Device.
19. A computer readable storage medium comprising at least one computer program for causing at least one processor to perform an operation, the operation comprising:

    setting a carrier group including a plurality of component carriers (CCs); and

    Receiving a DCI of a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group; includes,

    One or more parameters included in the DCI are used for all CCs in the carrier group,

    storage medium.
20. 20. The method of claim 19,

    The DCI is received only in the specific CC among CCs included in the carrier group,

    storage medium.
21. 20. The method of claim 19,

    Based on the received DCI on a threshold number or more of all CCs in the carrier group, the one or more parameters are used for all CCs in the carrier group,

    storage medium.
22. 20. The method of claim 19,

    The one or more parameters include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information about a search space set group switching,

    storage medium.
23. 20. The method of claim 19,

    A timer for search space set group switching is used for all CCs in the carrier group,

    storage medium.
24. 20. The method of claim 19,

    The carrier group is set based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system,

    storage medium.
25. In a method for a base station to transmit and receive a signal in a wireless communication system,

    setting a carrier group including a plurality of component carriers (CCs); and

    transmitting a DCI having a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group; includes,

    One or more parameters included in the DCI are used for all CCs in the carrier group,

    How to send and receive signals.
26. 26. The method of claim 25,

    The DCI is transmitted only to the specific CC among CCs included in the carrier group,

    How to send and receive signals.
27. 26. The method of claim 25,

    Based on the DCI being transmitted on a threshold number or more of all CCs in the carrier group, the one or more parameters are used for all CCs in the carrier group,

    How to send and receive signals.
28. 26. The method of claim 25,

    The one or more parameters include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information about a search space set group switching,

    How to send and receive signals.
29. 26. The method of claim 25,

    A timer for search space set group switching is used for all CCs in the carrier group,

    How to send and receive signals.
30. 26. The method of claim 25,

    The carrier group is set based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system,

    How to send and receive signals.
31. A base station for transmitting and receiving signals in a wireless communication system, comprising:

    at least one transceiver;

    at least one processor; and

    at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation; including,

    The specific operation is

    setting a carrier group including a plurality of component carriers (CCs); and

    Transmitting a DCI of a Downlink Control Information (DCI) format 2_0 on a specific CC in the carrier group;

    One or more parameters included in the DCI are used for all CCs in the carrier group,

    base station.
32. 32. The method of claim 31,

    The DCI is transmitted only to the specific CC among CCs included in the carrier group,

    base station.
33. 32. The method of claim 31,

    Based on the DCI being transmitted on a threshold number or more of all CCs in the carrier group, the one or more parameters are used for all CCs in the carrier group,

    base station.
34. 32. The method of claim 31,

    The one or more parameters include information on a use of a symbol in a slot, whether a downlink signal can be received, a channel occupancy time length, and/or information about a search space set group switching,

    base station.
35. 32. The method of claim 31,

    A timer for search space set group switching is used for all CCs in the carrier group,

    base station.
36. 32. The method of claim 31,

    The carrier group is set based on a Listen-Before-Talk (LBT) band of a communication system other than the wireless communication system,

    base station.

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