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

Abstract

The present invention relates to a wireless communication system, and in particular, to a method comprising steps of receiving a group common DCI on a first cell, wherein the group common DCI includes availability information about one or more RB sets configured for the first cell, performing a first PDCCH monitoring on the RB sets during a certain time duration but skipping channel measurement based on all RB sets being indicated as unavailable, and performing a second PDCCH monitoring and channel measurement on at least one available RB set based on at least one of the RB sets being indicated as available, and an apparatus therefor.

Description

Technical Field

[0001] The present disclosure relates to wireless communication systems, and more particularly, to a method and apparatus for transmitting and receiving wireless signals. Background Art

[0002] Wireless access systems have been widely deployed to provide various types of communication services, such as voice and data. Typically, wireless access systems are multiple-access systems that support communication for multiple users by sharing available system resources (bandwidth, transmission power, etc.) among them. For example, multiple-access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single-carrier frequency division multiple access (SC-FDMA) systems. Summary of the Invention

[0003] Technical issues

[0004] Provided are a method and apparatus for efficiently performing wireless signal transmission and reception procedures.

[0005] Those skilled in the art will recognize that the objectives that can be achieved by the present disclosure are not limited to the objectives that have been specifically described above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] In a first aspect of the present disclosure, a method for performing communication by a terminal in a wireless communication system may include: receiving group-common downlink control information (DCI) in a first cell, the group-common DCI including availability information about a set of resource blocks (RBs) configured in the first cell; performing a first physical downlink control channel (PDCCH) monitoring in the RB set and omitting channel measurement within a predetermined duration based on an indication that all RB sets are unavailable; and performing a second PDCCH monitoring and channel measurement in at least one available RB set based on an indication that at least one of the RB sets is available.

[0008] In a second aspect of the present disclosure, a terminal for use in a wireless communication system may include: at least one processor; and at least one computer memory operatively coupled to the at least one processor and configured to, when executed, cause the at least one processor to perform operations. The operations may include: receiving group-common downlink control information (DCI) in a first cell, the group-common DCI including availability information about a resource block (RB) set configured in the first cell; performing a first physical downlink control channel (PDCCH) monitoring in the RB set for a predetermined duration and omitting channel measurement based on an indication that all RB sets are unavailable; and performing a second PDCCH monitoring and channel measurement in at least one available RB set based on an indication that at least one of the RB sets is available.

[0009] In a third aspect of the present disclosure, a device for a terminal may include: at least one processor; and at least one computer memory operatively coupled to the at least one processor and configured to, when executed, cause the at least one processor to perform operations. The operations may include: receiving group-common downlink control information (DCI) in a first cell, the group-common DCI including availability information about a resource block (RB) set configured in the first cell; performing a first physical downlink control channel (PDCCH) monitoring in the RB set for a predetermined duration and omitting channel measurement based on an indication that all RB sets are unavailable; and performing a second PDCCH monitoring and channel measurement in at least one available RB set based on an indication that at least one of the RB sets is available.

[0010] In a fourth aspect of the present disclosure, a computer-readable storage medium comprising at least one computer program is provided herein, wherein the at least one computer program is configured to cause at least one processor to perform operations when executed. The operations may include: receiving group-common downlink control information (DCI) in a first cell, the group-common DCI including availability information about a resource block (RB) set configured in the first cell; performing a first physical downlink control channel (PDCCH) monitoring in the RB set for a predetermined duration and omitting channel measurement based on an indication that all RB sets are unavailable; and performing a second PDCCH monitoring and channel measurement in at least one available RB set based on an indication that at least one of the RB sets is available.

[0011] Each RB set may be a unit forming a basis of a channel access procedure (CAP) and includes one or more consecutive RBs.

[0012] Multiple RB sets can be configured in the first cell, wherein, based on the first transmission mode, one bit can be used to jointly indicate the availability of multiple RB sets for all RB sets, and wherein, based on the second transmission mode, multiple bits can be used to separately indicate the availability of multiple RB sets for each RB set in the RB sets.

[0013] The group-common DCI may also include availability information about the RB set of the second cell. The method may also include: based on the indication that all RB sets corresponding to the first cell are unavailable and the indication that the RB set of the second cell is unavailable, the terminal performs an operation under the assumption that the RB set of the second cell belongs to the first time slot duration of the DL transmission.

[0014] The first PDCCH monitoring may be performed in a first search space set, and for the second PDCCH monitoring, performed in a second search space set.

[0015] The first search space set and the second search space set may be different from each other.

[0016] Beneficial effects

[0017] According to the present disclosure, wireless signals can be efficiently transmitted and received in a wireless communication system.

[0018] Those skilled in the art will recognize that the effects that can be achieved using the present disclosure are not limited to those specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the principle of the disclosure.

[0020] Figure 1 Physical channels and a general signal transmission method using the physical channels in a 3rd Generation Partnership Project (3GPP) system as an exemplary wireless communication system are illustrated.

[0021] Figure 2 The radio frame structure is illustrated.

[0022] Figure 3 A resource grid of time slots is illustrated.

[0023] Figure 4 The mapping of physical channels in time slots is illustrated.

[0024] Figure 5 An acknowledgement / negative acknowledgement (ACK / NACK) transmission process is illustrated.

[0025] Figure 6 The Physical Uplink Shared Channel (PUSCH) transmission process is illustrated.

[0026] Figure 7 An exemplary wireless communication system supporting a license-exempt frequency band is illustrated.

[0027] Figure 8 An exemplary method of occupying resources in an unlicensed frequency band is illustrated.

[0028] Figure 9 The Channel Access Procedure (CAP) is illustrated.

[0029] Figure 10 CAP-Bandwidth (CAP-BW) is illustrated.

[0030] Figures 11 to 16 The method proposed in this specification is exemplified.

[0031] Figures 17 to 20 The communication system 1 and wireless device applied to the present disclosure are exemplified. DETAILED DESCRIPTION

[0032] The following technologies may be used for various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as 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 as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (WiMAX)), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (LTE-A) is an evolution of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0033] As more and more communication devices require greater communication capacity, there has been a need for enhanced mobile broadband communications relative to traditional radio access technologies (RATs). Large-scale machine type communications (MTC), which provide various services to multiple interconnected devices and things at any time and any place, is one of the important issues to be solved by the next generation of communications. The design of communication systems that take into account services that are sensitive to reliability and latency is also under discussion. Therefore, the introduction of next-generation radio access technologies (RATs) for enhanced mobile broadband communications (eMBB), massive MTC (mMTC) and ultra-reliable low-latency communications (URLLC) is under discussion. For convenience, this technology is referred to as NR or new RAT in this disclosure.

[0034] Although the following description is given in the context of a 3GPP communication system (e.g., NR) for clarity, the technical spirit of the present disclosure is not limited to the 3GPP communication system.

[0035] In a wireless access system, a user equipment (UE) receives information from a base station (BS) on the downlink (DL) and transmits information to the BS on the uplink (UL). Information sent and received between the UE and BS includes general data and various types of control information. Depending on the type and purpose of the information sent and received between the BS and UE, various physical channels exist.

[0036] Figure 1 Physical channels in a 3GPP system and a general signal transmission method using the physical channels are illustrated.

[0037] When the UE is powered on or enters a new cell, the UE performs an initial cell search (S101). The initial cell search involves acquiring synchronization with the BS. For this purpose, the UE receives a synchronization signal block (SSB) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). Based on the PSS / SSS, the UE synchronizes its timing to the BS and obtains information such as a cell identifier (ID). In addition, the UE can obtain information broadcast in the cell by receiving the PBCH from the BS. During the initial cell search, the UE can also monitor the DL channel status by receiving a downlink reference signal (DL RS).

[0038] Subsequently, in order to complete the connection with the BS, the UE may perform a random access procedure with the BS (S103 to S106). Specifically, the UE may transmit a preamble on a physical random access channel (PRACH) (S103), and may receive a PDCCH and a random access response (RAR) for the preamble on a PDSCH corresponding to the PDCCH (S104). The UE may then transmit a physical uplink shared channel (PUSCH) using the scheduling information in the RAR (S105), and perform a contention resolution procedure including receiving the PDCCH and the PDSCH signals corresponding to the PDCCH (S106).

[0039] After the above process, in the general UL / DL signal transmission process, the UE can receive PDCCH and / or PDSCH from the BS (S107), and send a physical uplink shared channel (PUSCH) and / or a physical uplink control channel (PUCCH) to the BS (S108). The control information sent by the UE to the BS is generally referred to as uplink control information (UCI). UCI includes hybrid automatic repeat request acknowledgement / negative acknowledgement (HARQ-ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indicator (CQI), precoding matrix index (PMI), rank indication (RI), etc. Typically, UCI is sent on PUCCH. However, if control information and data should be sent at the same time, the control information and data can be sent on PUSCH. In addition, upon receiving a request / command from the network, the UE can send UCI on PUSCH aperiodically.

[0040] Figure 2 The radio frame structure is illustrated.

[0041] In NR, UL and DL transmissions are configured per frame. Each radio frame is 10 ms long and is divided into two half-frames of 5 ms. Each half-frame is divided into five subframes of 1 ms. A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each slot includes 12 or 14 OFDM (A) symbols. When a normal CP is used, each slot includes 14 OFDM symbols. When an extended CP is used, each slot includes 12 OFDM symbols. Symbols can include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols).

[0042] Table 1 exemplarily illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS in the normal CP case.

[0043] [Table 1]

[0044] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 15KHz (u=0) 14 10 1 30KHz (u=1) 14 20 2 60KHz (u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

[0045] *N slot symb : The number of symbols in a time slot

[0046] *N frame，u slot : The number of time slots in a frame

[0047] *N subframe，u slot : The number of time slots in a subframe

[0048] Table 2 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the extended CP case.

[0049] [Table 2]

[0050] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 60KHz (u=2) 12 40 4

[0051] The frame structure is merely an example, and the number of subframes, the number of slots, and the number of symbols in a frame may be changed in various ways.

[0052] In an NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) can be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., a subframe, a time slot, or a transmission time interval (TTI)) consisting of the same number of symbols (referred to as a time unit (TU) for convenience) can be configured differently between aggregated cells. Symbols can include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols).

[0053] NR can support various parameter sets (or subcarrier spacing (SCS)) to provide various 5G services. For example, NR can support wide areas in conventional cellular bands in 15kHz SCS and support dense urban areas and wide carrier bandwidth with lower latency in 30 / 60kHz SCS. In SCS of 60kHz or above, NR can support bandwidths higher than 24.25GHz to overcome phase noise.

[0054] The NR frequency band can be divided into two frequency ranges: frequency range 1 (FR1) and frequency range 2 (FR2). The values ​​of the frequency ranges can vary. FR1 and FR2 can be configured as shown in Table 3 below. FR2 can represent millimeter wave (mmW).

[0055] [Table 3]

[0056] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0057] Figure 3 The resource grid during the duration of a time slot is illustrated. A time slot includes multiple symbols in the time domain. For example, a time slot includes 14 symbols in the normal CP case and 12 symbols in the extended CP case. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) can be defined by multiple consecutive (physical) RBs ((P)RBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be carried out in an active BWP, and only one BWP can be activated for a UE. Each element in the resource grid can be called a resource element (RE), and a complex symbol can be mapped to this resource element.

[0058] Figure 4 The structure of the time slot is illustrated. In the NR system, the frame has a self-contained structure, in which DL control channels, DL or UL data, UL control channels, etc. can all be contained in one time slot. For example, the first N symbols in the time slot (hereinafter, the DL control region) can be used to send DL control channels (e.g., PDCCH), and the last M symbols in the time slot (hereinafter, the UL control region) can be used to send UL control channels (e.g., PUCCH). N and M are integers greater than or equal to 0. The resource region (hereinafter referred to as the data region) between the DL control region and the UL control region can be used for DL ​​data (e.g., PDSCH) transmission or UL data (e.g., PUSCH) transmission. GP provides a time gap for the BS and UE to switch from transmit mode to receive mode or from receive mode to transmit mode. Some symbols at the time of DL to UL switching in a subframe can be configured as GP.

[0059] PDCCH delivers DCI. For example, PDCCH (i.e., DCI) can carry information about the transport format and resource allocation of the DL shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information on the paging channel (PCH), system information on the DL-SCH, information about resource allocation of higher-layer control messages such as RAR sent on the PDSCH, transmit power control commands, information about activation / release of configured scheduling, etc.

[0060] Various DCI formats are provided according to the information in the DCI.

[0061] Table 4 exemplarily shows the DCI format transmitted on the PDCCH.

[0062] [Table 4]

[0063]

[0064] The DCI includes a cyclic redundancy check (CRC). Depending on the owner or purpose of the PDCCH, the CRC is masked with various identifiers (IDs) (e.g., radio network temporary identifier (RNTI)). For example, if the PDCCH is for a specific UE, the CRC is masked by the UE ID (e.g., cell RNTI (C-RNTI)). If the PDCCH is used for a paging message, the CRC is masked by the paging RNTI (P-RNTI). If the PDCCH is used for system information (e.g., system information block (SIB)), the CRC is masked by the system information RNTI (SI-RNTI). When the PDCCH is used for RAR, the CRC is masked by the random access RNTI (RA-RNTI).

[0065] Table 5 exemplarily shows the usage of PDCCH and transport channels according to RNTI. The transport channel is related to data carried by PDSCH / PUSCH scheduled by PDCCH.

[0066] [Table 5]

[0067]

[0068] The modulation scheme of the PDCCH is fixed (e.g., Quadrature Phase Shift Keying (QPSK)), and one PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs), depending on the aggregation level (AL). One CCE consists of six Resource Element Groups (REGs). One REG is defined as one OFDMA symbol and one (P)RB. The PDCCH is transmitted via a Control Resource Set (CORESET). A CORESET corresponds to a set of physical resources / parameters used to carry the PDCCH / DCI within a BWP. For PDCCH reception, the UE can monitor (e.g., blindly decode) a set of PDCCH candidates in the CORESET. PDCCH candidates represent the CCEs monitored by the UE for PDCCH reception / detection. PDCCH monitoring can be performed in one or more CORESETs in the active DLBWP in each activated cell configured with PDCCH monitoring. The set of PDCCH candidates monitored by the UE is defined as a PDCCH Search Space (SS) set. The SS set can be a Common Search Space (CSS) set or a UE-Specific Search Space (USS) set.

[0069] Table 6 exemplarily shows the PDCCH SS.

[0070] [Table 6]

[0071]

[0072] PUCCH transmits uplink control information (UCI). UCI includes the following information.

[0073] -SR: Information used to request UL-SCH resources.

[0074] -HARQ-ACK: A response to a DL data packet (e.g., a codeword) on the PDSCH. The HARQ-ACK indicates whether the DL data packet has been successfully received. In response to a single codeword, a 1-bit HARQ-ACK can be sent. In response to two codewords, a 2-bit HARQ-ACK can be sent. HARQ-ACK responses include positive ACK (simply, ACK), negative ACK (NACK), discontinuous transmission (DTX), or NACK / DTX. The term "HARQ-ACK" is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0075] -CSI: Feedback information for DL ​​channels. Multiple-input multiple-output (MIMO) related feedback information includes RI and PMI.

[0076] Table 7 illustrates an exemplary PUCCH format. The PUCCH format may be divided into short PUCCH (formats 0 and 2) and long PUCCH (formats 1, 3, and 4) based on PUCCH transmission duration.

[0077] [Table 7]

[0078]

[0079] Figure 5 The ACK / NACK transmission process is illustrated. Figure 5 , PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1). PDCCH indicates DL assignment to PDSCH offset K0 and PDSCH to HARQ-ACK report offset K1. For example, DCI format 1_0 and DCI format 1_1 may include the following information.

[0080] - Frequency domain resource assignment: indicates the RB set assigned to PDSCH.

[0081] - Time domain resource assignment: indicates the starting position (eg, OFDM symbol index) and length (eg, number of OFDM symbols) of the PDSCH in a slot, as well as K0.

[0082] -PDSCH to HARQ_Feedback Timing Indicator: indicates K1.

[0083] -HARQ process number (4 bits): indicates the HARQ process ID of data (eg, PDSCH or TB).

[0084] - PUCCH Resource Indicator (PRI): indicates a PUCCH resource used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0085] After receiving the PDSCH in time slot #(n+K0) according to the scheduling information of time slot #n, the UE can send UCI on the PUCCH in time slot #(n+K1). The UCI includes a HARQ-ACK response to the PDSCH. In the case where the PDSCH is configured to carry a maximum of one TB, the HARQ-ACK response can be configured as one bit. In the case where the PDSCH is configured to carry up to two TBs, the HARQ-ACK response can be configured as two bits when spatial bundling is not configured, and as one bit when spatial bundling is configured. When time slot #(n+K1) is designated as the HARQ-ACK transmission timing of multiple PDSCHs, the UCI sent in time slot #(n+K1) includes HARQ-ACK responses to multiple PDSCHs.

[0086] Figure 6 An exemplary PUSCH transmission process is illustrated. Figure 6 , the UE can detect the PDCCH in time slot #n. The PDCCH may include UL scheduling information (e.g., DCI format 0_0 or DCI format 0_1). DCI format 0_0 and DCI format 0_1 ​​may include the following information.

[0087] - Frequency domain resource assignment: indicates the set of RBs allocated to PDSCH.

[0088] -Time domain resource assignment: Specifies the slot offset K2 that indicates the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH in the slot. The starting symbol and length of the PUSCH can be indicated by a start and length indicator value (SLIV) or separately.

[0089] The UE can then transmit the PUSCH in slot #(n+K2) according to the scheduling information in slot #n. The PUSCH includes the UL-SCH TB. When the PUCCH transmission time and the PUSCH transmission time overlap, UCI can be transmitted via the PUSCH (PUSCH piggyback).

[0090] Figure 7An exemplary wireless communication system supporting an unlicensed frequency band applicable to the present disclosure is illustrated. In the following description, a cell operating in a licensed frequency band (L-band) is defined as an L-cell, and the carrier of the L-cell is defined as a (DL / UL) LCC. A cell operating in an unlicensed frequency band (U-band) is defined as a U-cell, and the carrier of the U-cell is defined as a (DL / UL) UCC. The carrier / carrier frequency of a cell may refer to the operating frequency (e.g., central frequency) of the cell. A cell / carrier (e.g., CC) is generally referred to as a cell.

[0091] When carrier aggregation is supported, a UE can use multiple aggregated cells / carriers to exchange signals with the base station. When a UE is configured with multiple CCs, one CC can be set as the primary CC (PCC), and the remaining CCs can be set as secondary CCs (SCCs). Specific control information / channels (e.g., CSS PDCCH, PUCCH) can be sent and received only on the PCC. Data can be sent and received on the PCC / SCC. Figure 7 (a) shows a case where the UE and the BS exchange signals on both the LCC and the UCC (non-standalone (NSA) mode). In this case, the LCC and the UCC can be set as the PCC and SCC, respectively. When the UE is configured with multiple LCCs, one specific LCC can be set as the PCC, and the remaining LCCs can be set as SCCs. Figure 7 (a) corresponds to LAA of the 3GPP LTE system. Figure 7 (b) shows a case where the UE and the BS exchange signals on one or more UCCs without an LCC (standalone (SA) mode). In this case, one of the UCCs can be set as a PCC, and the remaining UCCs can be set as SCCs. Both the NSA mode and the SA mode can be supported in the U-band of the 3GPP NR system.

[0092] The signal transmission / reception operations in the unlicensed band described in the present disclosure may be performed based on the above deployment scenarios (unless otherwise specified).In addition, the following definitions may be applied to the terms used herein.

[0093] - Channel: may be composed of consecutive RBs (where a channel access procedure is performed in a shared spectrum) and may refer to a carrier or a portion of a carrier.

[0094] - Channel Access Procedure (CAP): refers to a procedure for evaluating channel availability based on sensing in order to determine whether other communication nodes use the channel before signal transmission. The basic unit for sensing is the duration T sl= 9us sensing time slot. If the BS or UE senses the channel during the sensing time slot duration and the power detected in at least 4us during the sensing time slot duration is less than the energy detection threshold X Thresh , then the sensing time slot duration T sl is considered to be in idle state. Otherwise, the sensing time slot duration T sl = 9us is considered a busy state. CAP can be called Listen Before Talk (LBT).

[0095] - Channel occupancy: means the corresponding transmission by the BS / UE on the channel after performing CAP.

[0096] Channel Occupancy Time (COT): This refers to the total time a BS / UE and any BS / UE sharing the channel can transmit on a channel after the BS / UE performs CAP. When determining the COT, gap periods are also counted when the transmission gap is 25µs or less. The COT can be shared for transmissions between a BS and its corresponding UE.

[0097] -DL transmission burst: Defined as a group of transmissions from a BS with no gaps exceeding 16µs. Transmissions from a BS separated by gaps exceeding 16µs are considered separate DL transmission bursts. In a DL transmission burst, the BS may perform transmissions after a gap without sensing channel availability.

[0098] -UL transmission burst: Defined as a group of transmissions from a UE with no gaps exceeding 16µs. Transmissions from a UE separated by gaps exceeding 16µs are considered separate UL transmission bursts. Within an UL transmission burst, a UE may perform a transmission after a gap without sensing channel availability.

[0099] Figure 8 An exemplary method for occupying resources in an unlicensed band is illustrated. A communication node (e.g., BS, UE) in an unlicensed band must determine whether a channel is used by other communication nodes before signal transmission. To this end, a communication node in an unlicensed band can perform CAP to access the channel on which the transmission is performed. CAP can be performed based on sensing. For example, a communication node can first perform carrier sense (CS) before signal transmission to check whether other communication nodes are sending signals. The situation in which it is determined that other communication nodes are not sending signals is defined as confirming an idle channel assessment (CCA). When there is a CCA threshold (e.g., X) predefined or set by a higher layer (e.g., RRC), the CCA threshold is determined to be 0. Thresh), if energy above the CCA threshold is detected on the channel, the communication node determines the channel state as busy. Otherwise, the channel state may be determined to be idle. When the channel state is determined to be idle, the communication node may start transmitting signals in the unlicensed band.

[0100] Table 8 exemplarily shows the types of CAP.

[0101] [Table 8]

[0102]

[0103] Figure 9 FIG. 1 is a flowchart of a CAP operation for a BS to transmit a downlink signal through an unlicensed frequency band. Figure 9 , BS first senses the channel at a delay duration T d If the channel is in an idle state for the duration of the additional sensing slot, transmission may be performed when the counter N reaches 0 (S1234). Here, the counter N is adjusted by sensing the channel for the additional sensing slot duration according to the following process.

[0104] Step 1) (S1220) Set N=N init Here, N init is evenly distributed between 0 and CW p Then, go to step 4.

[0105] Step 2) (S1240) If N>0 and the BS chooses to decrement the counter, then set N=N-1.

[0106] Step 3) (S1250) Sense the channel for the additional sensing slot duration. Then, if the additional sensing slot duration is idle (Y), proceed to step 4. If not (N), proceed to step 5.

[0107] Step 4) (S1230) If N=0 (Y), terminate CAP (S1232). Otherwise (N), go to step 2.

[0108] Step 5) (S1260) Sense the channel until the additional delay duration T d A busy sensing slot is detected within 1 second or an additional delay duration T is added d All sensing slots within are detected as idle.

[0109] Step 6) (S1270) If the additional delay duration T d If the channel is sensed as idle (Y) for all sensing time slot durations, then go to step 4. If not (N), then go to step 5.

[0110] Table 9 shows an example of m applied to CAP. p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW size vary according to the channel access priority class.

[0111] [Table 9]

[0112]

[0113] Delay duration T d By m p Continuous sensing time slots T sl (9us)+duration T f (16us) duration. f The sensing time slot duration T is included at the beginning of the 16us duration. sl .

[0114] Implementation: Signaling in NR-U

[0115] For the UE, in the unlicensed band, only a single carrier can be configured, or multiple carriers can be aggregated / configured. In this case, up to four BWPs can be configured for each carrier, and only one BWP can be activated. When the band unit forming the basis of the CAP in the unlicensed band is defined as CAP-BW, each carrier / BWP can correspond to one CAP-BW, or can correspond to multiple CAP-BWs. The size of a CAP-BW can be a fixed value, or can be set differently according to the configuration of the network (or BS). For example, the size of a CAP-BW can be fixed to 20MHz, or can be variably set within the carrier based on high-layer (e.g., RRC) signaling and / or DCI. When the CAP-BW configuration information is not configured, the CAP-BW size / deployment can follow a predefined value according to the frequency region of the carrier. The CAP-BW can consist of consecutive RBs (hereinafter referred to as RB sets). In the present disclosure, CAP-BW and RB sets can have the same meaning.

[0116] Figure 10 This example shows how to configure CAP-BW in a carrier. Figure 10 , three component carriers (CCs) are configured. CC#1 can correspond to two CAP-BWs, and CC#2 and #3 can each correspond to one CAP-BW. CC#1 / #2 can be defined as intra-band carrier aggregation (CA), and CC#1 / #2 and CC#3 can be defined as inter-band CA.

[0117] In this case, the BS can perform CAP for each CAP-BW and can send DL bursts in the CAP-BW (where CAP succeeded) and skip sending DL bursts in other CAP-BWs (where CAP failed) based on the CAP result. In addition, in the CAP-BW occupied for a predetermined time by CAP, a portion of the occupied time can be shared with UL bursts. In addition, notifying the UE of the BS's frequency domain occupancy information can be advantageous in at least the following aspects.

[0118] -The UE can perform power saving by skipping PDCCH monitoring in a CAP-BW known to be unoccupied by the BS (e.g., CAP-BW OFF state). Here, skipping PDCCH monitoring may include skipping monitoring of DCI formats used for data scheduling (e.g., DCI format 0_X, DCI format 1_X). However, PDCCH monitoring for receiving a group-common DCI format (e.g., DCI format 2_0) during the CAP-BW OFF duration may be performed as an exception.

[0119] -The UE can save power by skipping CSI / RRM (Radio Resource Management) / RLM (Radio Link Monitoring) measurements in CAP-BW that is known to be unoccupied by the BS. For example, when CSI-RS is configured to be transmitted in CAP-BW off slots, the UE can skip channel measurements based on the CSI-RS in the CAP-BBW off slots. Alternatively, the CSI-RS in the CAP-BW off slots can be excluded from the channel measurement process.

[0120] -For CAP for UL burst transmission shared with DL burst occupied by the BS, UL transmission may be allowed if the channel is idle only for a certain time without random backoff, or UL transmission may be allowed even without checking whether the channel is idle / busy.

[0121] In the existing NR system, the DL / UL direction can be dynamically signaled through DCI. Specifically, SFI fields for multiple cells can be included in the DCI, and the SFI field position of the cell in the DCI bit stream can be determined based on the offset set for the cell. For example, assume that the SFI field corresponding to cell #1 is represented by 3 bits and the SFI field corresponding to cell #2 is represented by 5 bits. In this case, in the DCI for SFI indication with a total size of 100 bits, the segment corresponding to cell #1 can be 3 bits starting from N1 (e.g., N1=14) bits, and the segment corresponding to cell #2 can be 5 bits starting from N2 (e.g., N2=50) bits. N1 and N2 are set for each unit. The SFI field includes an SFI-index. The SFI-index corresponds to a SlotFormatCombination, and the SlotFormatCombination indicates the slot format for K (=>1) consecutive slots. The slot format indicates DL / UL / flexible for each symbol in the slot. K may also be set differently for each SFI-index. In existing NRs, the DCI for SFI indication may correspond to DCI format 2_0 as a group common PDCCH and may be scrambled with the SFI-RNTI. The UE may perform communication in a slot based on the slot format. For example, in a slot, PDCCH monitoring / reception, PDSCH reception, and / or CSI-RS reception / measurement may be performed in DL symbols, and PUCCH transmission, PUSCH transmission, and / or SRS transmission may be performed in UL symbols.

[0122] Table 10 exemplarily shows a slot format. Here, D represents a DL symbol, U represents a UL symbol, and F represents a flexible symbol.

[0123] [Table 10]

[0124]

[0125] In the following, the present disclosure proposes a method for notifying DL / UL direction and / or frequency domain occupancy information. Specifically, the present disclosure proposes a method for notifying BS DL / UL direction information and / or frequency domain occupancy information for each CAP-BW (or each BWP / carrier, each CAP-BW / BWP / carrier group). The proposal of the present disclosure can be limitedly applied to carriers operating in unlicensed bands (or shared spectrum bands).

[0126] In the present disclosure, DL / UL direction and / or frequency domain occupancy information can be signaled by physical layer control information (e.g., DCI). For simplicity, in the present disclosure, DCI is referred to as channel occupancy-DCI (CO-DCI). CO-DCI can be configured based on the existing DCI format 2_0. As an example, CO-DCI can be defined in DCI format 2_0. In this case, in order to indicate CO-DCI information (e.g., DL / UL direction and / or frequency domain occupancy information), new fields can be added to DCI format 2_0, or some fields of DCI format 2_0 can be reinterpreted. In addition, a new group common DCI format can be defined for CO-DCI. Alternatively, CO-DCI can be configured based on an existing UE-specific DCI format. For example, CO-DCI can be defined in an existing UE-specific DCI format. In this case, in order to indicate CO-DCI information, new fields can be added to the existing UE-specific DCI format, or some fields of the existing UE-specific DCI format can be reinterpreted. In addition, a new UE-specific DCI format can be defined for CO-DCI.

[0127] 1) Receiver (Entity A (e.g., UE)):

[0128] [Method #1] Configure the SFI field in the CO-DCI for each CAP-BW

[0129] For example, in Figure 10 In the CA scenario, N1 can be set for CAP-BW#1-1, N2 can be set for CAP-BW#1-2, N3 can be set for CAP-BW#2-1, and N4 can be set for CAP-BW#3-1, as shown in FIG. Figure 11 As shown in FIG. 4 , the SFI for each CAP-BW can be indicated in the CO-DCI.

[0130] [Method #1-1] Configure the SFI field for each CAP-BW in the CO-DCI, where a specific CAP-BW can be shared Share the same offset value

[0131] exist Figure 11In the CO-DCI, all or part of N1 / N2 / N3 / N4 can be set to the same value. For example, CAP-BW#1-1 / #1-2 belong to the same carrier. Therefore, assuming that the BS indicates the same D / U direction for CAP-BW#1-1 / #1-2, the DCI overhead can be reduced by indicating the D / U direction of CAP-BW#1-1 / #1-2 through the same field. That is, the D / U direction (e.g., SFI field) can be configured for each carrier. However, since the on / off (or available / unavailable) status of CAP-BW#1-1 / #1-2 can also be shared, the on / off status may not be indicated for each CAP-BW. This signaling configuration can implicitly indicate that the BS attempts to perform transmission only when the CAP for both CAP-BW#1-1 and CAP-BW#1-2 belonging to CC#1 is successful, otherwise, it does not send a DL burst. In addition, setting the offsets corresponding to CAP-BW #1-1 / #1-2 belonging to the same carrier to the same value may mean that the RBs corresponding to the guard band present between CAP-BW #1-1 / #1-2 are available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or may be interpreted as meaning that the guard band is not configured).

[0132] Alternatively, a transmission mode related to the transmission method may be configured separately for each CAP-BW of the BS. For example, whether the mode is a mode in which transmission is performed (in all CAP-BWs) only when CAP for all CAP-BWs belonging to the carrier / active BWP is successful (hereinafter, Mode 1), or a mode 2 in which transmission is attempted for some CAP-BWs among the CAP-BWs belonging to the carrier / active BWP when CAP for some CAP-BWs is successful (hereinafter, Mode 2) may be separately signaled. When Mode 1 is configured, the UE may assume that the SFI field is shared for all CAP-BWs belonging to the carrier / active BWP (i.e., the same offset value is set, or an offset value is set for each cell). When Mode 2 is configured, the UE may assume that the SFI field is configured for each CAP-BW belonging to the carrier / active BWP (i.e., a separate offset value is set, or an offset value is set for each CAP-BW).

[0133] In [Method #1] and [Method #1-1], the CAP-BW can be indicated as closed (that is, the BS does not attempt to transmit due to CAP failure) by a specific state of the SFI field. As an example, when the SFI field is configured with 3 bits and is set to '000', it can indicate that the CAP-BW corresponding to the SFI field is in a closed state. As another example, when SlotFormatCombination is not linked to a specific state of the SFI field (e.g., SFI-index), the closed state of CAP-BW can be indicated by using this state. The SFI field size can be determined by the maximum number of set SFI-indexes. When the SFI field size is 3 bits, SlotFormatCombination may not be configured for some of the 8 SFI-indexes. In this case, when the value of the SFI-index for which SlotFormatCombination is not configured is signaled, the UE can recognize that the corresponding CAP-BW is in a closed state.

[0134] When a CAP-BW is in the off state, UL slot / symbol information about a CAP-BW in the on state belonging to the same carrier / BWP as the CAP-BW can be conveyed to the CAP-BW in the off state. As an example, CAP-BW#1-1 can be signaled as being in the off state, but CAP-BW#1-2 can be signaled as being in the on state (when separate SFI fields are configured for CAP-BW#1-1 and CAP-BW#1-2). In this case, for example, if all symbols of slot #k / k+1 for CAP-BW#1-2 are signaled as UL through CO-DCI, the UE can recognize that CAP-BW#1-1 is also UL for slot #k / k+1. This is because, under the assumption that a BS operating in an unlicensed band generally operates through one radio frequency (RF) module, it can be considered impossible to perform transmission in an adjacent band while performing reception on an adjacent band. Therefore, the UE can realize that PDCCH monitoring is not performed in CAP-BW#1-1 or CAP-BW#1-2 during time slot #k / k+1, and the configured UL transmission (e.g., periodic / semi-persistent PUCCH / SRS, configured granted PUSCH, etc.) is allowed.

[0135] (For all cells or a portion thereof configured in an unlicensed band) the channel occupancy or DL ​​burst of the BS can be divided into two durations. One is the duration within the first k time slots (duration 1), and the other is the duration after the first k time slots (duration 2). Here, k can be predefined as an integer greater than or equal to 1, or can be set by separate RRC signaling. The reason for dividing the channel occupancy or DL ​​burst of the BS into two durations is that the BS does not know the CAP-BW in which the BS will actually successfully perform CAP, and therefore the CAP-BW status information is uncertain in duration 1. Therefore, even if CAP-BW is indicated to be on, duration 1 can be handled similarly to the case where CAP-BW is off. For example, the UE can perform PDCCH monitoring in the same manner as the duration for which CAP-BW is off (for example, the same as PDCCH monitoring before discovering CO-DCI), and may not perform CSI measurement. On the other hand, in duration 2, it can be clearly determined whether CAP-BW is on or off based on the CAP-BW status information. Therefore, in duration 2, the UE can perform operations based on CAP-BW on / off. For example, when CAP-BW is on, the UE may perform PDCCH monitoring based on a scheme (e.g., search space set / DCI format) defined for the CAP-BW on duration, and may also perform CSI measurements. For example, DCCH monitoring during the CAP-BW on duration may include DCI format 0_X / 1_X / 2_0 monitoring. On the other hand, when CAP-BW is off, the UE may perform PDCCH monitoring based on a scheme (e.g., search space set / DCI format) defined for the CAP-BW off duration, and may not perform (e.g., may omit / skip) CSI measurements. For example, during the CAP-BW off duration, PDCCH monitoring may include DCI format 2_0 monitoring, but may not include DCI format 0_X / 1_X monitoring.

[0136] Therefore, a specific state of the SFI field can indicate that the corresponding CAP-BW (in the timeslot in which the CO-DCI is detected) belongs to the first transmission timeslot (e.g., DL burst) or the first k timeslots in the duration occupied by the BS. As an example, when the SFI field is configured with 3 bits and is set to '111', it can indicate that the CAP-BW corresponding to the SFI field (in the timeslot in which the CO-DCI is detected) belongs to the first timeslot (or the first k timeslots) of the DL burst. As another example, when SlotFormatCombination is not linked to a specific state of the SFI field (e.g., SFI-index), this state can be utilized. The SFI field size can be determined by the maximum number of configured SFI-indexes. When the SFI field size is 3 bits, SlotFormatCombination may not be configured for some of the 8 SFI-indexes. In this case, when the SFI-index value for which SlotFormatCombination is not configured is signaled, the UE can recognize that the CAP-BW belongs to the first timeslot (or the first k timeslots) of the DL burst (in the timeslot in which the CO-DCI is detected). The UE can then assume DL (for all cells or a portion thereof configured in the unlicensed band) during the first time slot (or the first k time slots) of the DL burst. That is, in the time slot in which the CAP-BW is identified as belonging to the first time slot (or the first k time slots) of the DL burst, all symbols can be assumed to be DL. Therefore, the UE can perform PDCCH monitoring in the CAP-BW under the assumption that all symbols in the time slot are DL. In this method, in order to update the time slot format of the CAP-BW, the BS can send DCI format 2_0 again within the same DL burst. For example, upon receiving SFI=111, the UE can only recognize that the CAP-BW is the start of a DL burst, and identify the time slot format (e.g., D / U / F) in the DL burst / COT based on the updated SFI information, while monitoring the PDCCH as in the case where the CAP-BW is outside the DL burst.

[0137] In addition, (for all cells configured in the unlicensed band or a portion thereof) the BS's channel occupancy or DL ​​burst can be divided into two durations, and the search space set (or PDCCH) can be configured independently for each duration. For example, duration 1 can be defined as the duration within the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells configured in the unlicensed band or a portion thereof), and duration 2 can be defined as the duration after the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells configured in the unlicensed band or a portion thereof). Here, k can be predefined as an integer greater than or equal to 1, or can be set through separate RRC signaling. Specifically, when the UE is signaled / recognized that CAP-BW belongs to the first time slot (or the first k time slots) of a DL burst (in the time slot where CO-DCI is detected), the UE may monitor PDCCHs belonging to a specific first search space set that is configured to be monitored for a corresponding duration (e.g., duration 1) (for all cells configured in the unlicensed band or a portion thereof), or may monitor a specific first PDCCH configured to be monitored for the corresponding duration (e.g., duration 1). On the other hand, when the UE is signaled / recognized that CAP-BW is on (in the time slot where CO-DCI is detected), but does not belong to the first time slot (or the first k time slots) of a DL burst, the UE may monitor PDCCHs belonging to a specific second search space set that is configured to be monitored for a corresponding duration (e.g., duration 2) (for all cells configured in the unlicensed band or a portion thereof), or may monitor a specific second PDCCH configured to be monitored for the corresponding duration (e.g., duration 2). Here, the specific first search space set and the second search space set may be different from each other. For example, the specific first search space set and the second search space set may have different PDCCH monitoring periods. In addition, the specific first PDCCH and the second PDCCH may be different from each other. For example, the DCI formats sent on the specific first PDCCH and the second PDCCH may be different from each other. For example, the DCI format sent on the specific first PDCCH may include a group common DCI format (e.g., DCI format 2_0). In addition, the DCI format sent on the specific second PDCCH may include a DCI format for data scheduling (e.g., DCI format 0_X / 1_X) and a group common DCI format (e.g., DCI format 2_0).

[0138] [Method #2] Configure the SFI field for each CAP-BW in the CO-DCI and configure it through a separate field A bitmap indicating the on / off status of each CAP-BW

[0139] In such Figure 10In the CA scenario shown, N1 can be set for CAP-BW#1-1, N2 can be set for CAP-BW#1-2, N3 can be set for CAP-BW#2-1, and N4 can be set for CAP-BW#3-1, as shown in FIG. Figure 12 As shown in FIG. , the on / off state and SFI can be indicated for each CAP-BW in CO-DCI. Although the SFI field and the field indicating on / off are shown as being positioned consecutively in the figure, the bit indicating the on / off state can be added after the SFI field, or the bitmap or bit field indicating on / off can be configured with a separate offset value for each CAP-BW.

[0140] [Method #2-1] Configure the SFI field for each CAP-BW in CO-DCI and configure it through a separate field. A bitmap is set to indicate the on / off status of each CAP-BW, where specific CAP-BWs can share the SFI field and / or Bit field value indicating on / off status

[0141] exist Figure 12 In the CO-DCI, all or part of N1 / N2 / N3 / N4 can be set to the same value. For example, CAP-BW#1-1 / #1-2 belong to the same carrier. Therefore, assuming that the BS indicates the same D / U direction for CAP-BW#1-1 / #1-2, the DCI overhead can be reduced by indicating the D / U direction of CAP-BW#1-1 / #1-2 through the same field in CO-DCI. That is, the D / U direction (e.g., SFI field) can be configured for each carrier. However, since the on / off state of CAP-BW#1-1 / #1-2 can also be shared, the on / off state may not be indicated for each CAP-BW. This signaling configuration can implicitly indicate that the BS attempts to perform transmission only when the CAP for both CAP-BW#1-1 and CAP-BW#1-2 belonging to CC#1 is successful, otherwise, it does not send a DL burst. In addition, setting the offsets corresponding to CAP-BW #1-1 / #1-2 belonging to the same carrier to the same value may mean that the RBs corresponding to the guard band present between CAP-BW #1-1 / #1-2 are available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or may be interpreted as meaning that the guard band is not configured).

[0142] Alternatively, the transmission mode associated with the transmission method can be configured separately for each CAP-BW of the BS. For example, the BS can separately signal whether the mode is a mode in which transmission is performed (across all CAP-BWs) only when CAP for all CAP-BWs belonging to the carrier / active BWP is successful (hereinafter, Mode 1), or a mode 2 in which transmission is attempted for some CAP-BWs belonging to the carrier / active BWP when CAP for some CAP-BWs is successful (hereinafter, Mode 2). When Mode 1 is configured, the UE can assume that the SFI field and bitmap field are shared for all CAP-BWs belonging to the carrier / active BWP (for example, only one bit is configured for the bitmap field corresponding to the cell, and only one SFI field is configured). When Mode 2 is configured, the UE can assume that the bit field in the bitmap is configured for each CAP-BW belonging to the carrier / active BWP (that is, the offset value of the SFI field and the bitmap field are configured for each CAP-BW).

[0143] As another example, Figure 13 As shown, the offset value of N1 can be commonly set for the SFI fields of CAP-BW#1-1 / 1-2 / 2-1 / 3-1. Furthermore, in the bitmap indicating the on / off status, the offset values ​​of N2 / N3 / N4 / N5 can be set for each CAP-BW, or all or some of N2 / N3 / N4 / N5 can be set to the same value. If N2 and N3 are set to the same value, the on / off status of CAP-BW#1-1 / #1-2 can also be shared, and thus the on / off status may not be indicated for each CAP-BW. This signaling configuration can implicitly instruct the BS to attempt transmission only if the CAP for both CAP-BW#1-1 and CAP-BW#1-2 belonging to CC#1 is successful; otherwise, it does not send a DL burst. In addition, setting the offsets corresponding to CAP-BW #1-1 / #1-2 belonging to the same carrier to the same value may mean that the RBs corresponding to the guard band present between CAP-BW #1-1 / #1-2 are available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or may be interpreted as meaning that the guard band is not configured).

[0144] As another example, Figure 14As shown, for each CC (or BWP), a common offset N1 (relative to the SFI field position) can be set, and the bitmap indicating the on / off status can be signaled through a k-bit bitmap after the offset value (or before the offset value, after the end of the field size configured after N1, after the field size configured after N1). Here, k can be equal to the number of CAP-BWs corresponding to the CC (or BWP), and can be less than or equal to the number of CAP-BWs corresponding to the CC (or BWP). When k is less than the CAP-BW, the value of k can be signaled separately. In addition, when k is less than the CAP-BW, the relationship between each bit of the k-bit bitmap and the corresponding CAP-BW can be pre-configured by the BS. When k=1, the on / off status of CAP-BW#1-1 / #1-2 can also be shared, so the on / off status may not be indicated for each CAP-BW. This signaling configuration can implicitly instruct the BS to attempt to perform transmission only when the CAP for both CAP-BW #1-1 and CAP-BW #1-2 belonging to CC #1 is successful, otherwise it does not send a DL burst. In addition, setting the bit value corresponding to the on / off state of CAP-BW #1-1 / #1-2 belonging to the same carrier to the same position can mean that the RB corresponding to the guard band existing between CAP-BW #1-1 / #1-2 is available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or it can be interpreted as meaning that the guard band is not configured).

[0145] Alternatively, the transmission mode associated with the transmission method can be configured separately for each CAP-BW of the BS. For example, whether the mode is a mode in which transmission is performed (across all CAP-BWs) only when CAP for all CAP-BWs belonging to the carrier / active BWP is successful (hereinafter, Mode 1), or a mode 2 in which transmission is attempted for some CAP-BWs among the CAP-BWs belonging to the carrier / active BWP when CAP for some CAP-BWs is successful (hereinafter, Mode 2) can be separately signaled. When Mode 1 is configured, the UE can assume that the bitmap field indicating the on / off state is shared for all CAP-BWs belonging to the carrier / active BWP (that is, only one bit is configured for the bitmap field corresponding to the cell). Alternatively, if the bit field in the bitmap is configured for each CAP-BW belonging to the carrier / active BWP when Mode 1 is configured, the UE can assume that only '1' or '0' is signaled in the bitmap. When mode 2 is configured, the UE may assume that the bit field in the bitmap is configured for each CAP-BW belonging to a carrier / active BWP (that is, the offset value of the bitmap field is set for each CAP-BW).

[0146] In [Method #2] and [Method #2-1], the UE can recognize that if the 1-bit information corresponding to each CAP-BW is '0' (or '1'), the corresponding CAP-BW is closed, and if the information is '1' (or '0'), the corresponding CAP-BW is opened. When the CAP-BW is in the closed state, the UL slot / symbol information about the CAP-BW in the opened state belonging to the same carrier / BWP or the same frequency band as the CAP-BW can be conveyed to the CAP-BW in the closed state. As an example, CAP-BW #1-1 can be signaled as being in the closed state, but CAP-BW #1-2 can be signaled as being in the opened state (when the opening / closing information about CAP-BW #1-1 and the opening / closing information about CAP-BW #1-2 are signaled through separate bit fields and the SFI field is signaled in common). In this case, for example, if it is signaled through CO-DCI that all symbols of slot #k / k+1 for CAP-BW #1-2 are UL, the UE can recognize that CAP-BW #1-1 is also UL for slot #k / k+1. This is because, under the assumption that a BS operating in an unlicensed band generally operates with one radio frequency (RF) module, it can be considered impossible to perform transmission in an adjacent band while performing reception on an adjacent band. Therefore, the UE can recognize that during slot #k / k+1, PDCCH monitoring is not performed in CAP-BW #1-1 or CAP-BW #1-2, and configured UL transmission (e.g., periodic / semi-persistent PUCCH / SRS, configured granted PUSCH, etc.) is allowed.

[0147] Alternatively, even if CAP-BW is signaled as being in the OFF state, the UE can recognize that the UL information on the SFI signaling corresponding to the CAP-BW is valid. As an example, when CAP-BW #1-1 is signaled as being in the OFF state, and all symbols of slot #k / k+1 are signaled as DL and all symbols of slot #k+2 / k+3 are signaled as UL for CAP-BW #1-1, the UE can recognize slot #k+2 / k+3 as UL and ignore the SFI signaling in slot #k / k+1. In this case, the UE can recognize that PDCCH monitoring is not performed in CAP-BW #1-1 during slots #k / k+1 / k+2 / k+3, and that configured UL transmissions (e.g., periodic / semi-persistent PUCCH / SRS, configured granted PUSCH, etc.) are allowed during slots #k+2 / k+3.

[0148] Alternatively, specific states of the SFI field and / or bitmap field can indicate that the CAP-BW (in the time slot in which the CO-DCI is detected) belongs to the first transmission time slot (e.g., a DL burst) or the first k time slots in the duration occupied by the BS. Here, the value of k can be predefined as an integer greater than or equal to 1, or can be set by separate RRC signaling. As one method, when all bits in the bitmap corresponding to all CAP-BWs corresponding to the cell in which the CO-DCI is transmitted indicate off, it can indicate that the CAP-BW (in the time slot in which the CO-DCI is detected) belongs to the first time slot (or the first k time slots) of the DL burst. Paradoxically, when CO-DCI is transmitted from a cell, all CAP-BWs corresponding to the cell are off. Therefore, this transmission can be used for the above-mentioned signaling. That is, through CO-DCI transmission, this can indirectly indicate that the CAP-BW is on. In addition, through the CAP-BW on / off information, this can indicate that the CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst. For example, when CO-DCI is transmitted on CC#1, if all on / off information corresponding to CAP-BW#1-1 and CAP-BW#1-2 in the bitmap is off, this may indicate that CAP-BW#1-1 and CAP-BW#1-2 (in the time slot in which CO-DCI is detected) belong to the first time slot (or the first k time slots) of the DL burst.

[0149] In addition, CO-DCI can be sent on CC#A, and all on / off information corresponding to CC#A / B can be included in the CO-DCI (i.e., cross-carrier indication). At this time, since the CAP-BW on / off information of CC#B is sent on another CC (e.g., CC#A), it may be unclear whether there is actual transmission by the BS on CC#B. Therefore, if all CAP-BWs of CC#A are turned off, the UE can assume that the DL burst starts even on CC#B (even if the transmission is actually performed only on CC#A). On the other hand, if some or all of CC#A's CAP-BWs are later updated to on, the information about CC#B can be recognized as truly off only when all CAP-BW on / off information of CC#B is off. For example, CO-DCI can be sent on CC#1, and all on / off information corresponding to CC#1 / 2 / 3 can be included in the CO-DCI. In this case, a UE receiving CO-DCI in which all on / off information in the bitmap corresponding to CAP-BW#1-1 / CAP-BW#1-2 / CAP-BW#2-1 / CAP-BW#3-1 is off can recognize that CC#2 and CC#3, as well as CC#1 (in the time slot in which CO-DCI is detected), belong to the first time slot (or the first k time slots) of the DL burst. In addition, CO-DCI can be transmitted on CC#2, and all on / off information corresponding to CC#1 / 2 / 3 can be included in the CO-DCI. In this case, a UE receiving CO-DCI including bitmap information corresponding to CAP-BW #1-1 = Off, CAP-BW #1-2 = Off, CAP-BW #2-1 = On, and CAP-BW #3-1 = Off on CC #2 can recognize that neither CAP-BW #1-1 nor CAP-BW #1-2 belonging to CC #1 belongs to the first slot (or first k slots) of a DL burst, because CC #2 does not belong to the first slot (or first k slots) of a DL burst (in the slot in which CO-DCI is detected). Therefore, the UE can recognize that actual DL reception is not available in CAP-BW #1-1 nor CAP-BW #1-2.

[0150] As an example, when the SFI field is configured as 3 bits and is set to '111', it may indicate that the CAP-BW corresponding to the SFI field (in the time slot in which the CO-DCI is detected) belongs to the first time slot (or the first k time slots) of the DL burst. As another example, when SlotFormatCombination is not linked to a specific state of the SFI field (e.g., SFI-index), this state may be utilized. The SFI field size may be determined by the maximum number of SFI-indexes set. When the SFI field size is 3 bits, SlotFormatCombination may not be configured for some of the 8 SFI-indexes. In this case, when the value of the SFI-index for which SlotFormatCombination is not configured is signaled, the UE may recognize that the CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst (in the time slot in which the CO-DCI is detected). The UE may then assume DL (for all cells or a portion thereof configured in the unlicensed band) during the first time slot (or the first k time slots) of the DL burst. That is, in a time slot in which the CAP-BW is identified as the first time slot (or the first k time slots) belonging to a DL burst, all symbols may be assumed to be DL. Therefore, the UE may perform PDCCH monitoring in the CAP-BW under the assumption that all symbols in the time slot are DL. In this method, in order to update the time slot format of the CAP-BW, the BS may send DCI format 2_0 again within the same DL burst. For example, upon receiving SFI=111, the UE may only recognize that the CAP-BW is the start of a DL burst and identify the time slot format (e.g., D / U / F) in the DL burst / COT based on the updated SFI information, while monitoring the PDCCH as in the case where the CAP-BW is outside the DL burst.

[0151] In addition, (for all cells configured in the unlicensed band or a portion thereof) the BS's channel occupancy or DL ​​burst can be divided into two durations, and the search space set (or PDCCH) to be monitored can be configured independently for each duration. For example, duration 1 can be defined as the duration within the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells configured in the unlicensed band or a portion thereof), and duration 2 can be defined as the duration after the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells configured in the unlicensed band or a portion thereof). Here, k can be predefined as an integer greater than or equal to 1, or can be set through separate RRC signaling. Specifically, when signaling / recognizing that CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst (in the time slot in which CO-DCI is detected), the UE may monitor the PDCCH belonging to a specific first search space set that is configured to be monitored within the corresponding duration (e.g., duration 1) (for all cells configured in the unlicensed band or a portion thereof), or may monitor the specific first PDCCH configured to be monitored within the corresponding duration (e.g., duration 1). Alternatively, since it is not determined whether the CSI-RS is transmitted in the CAP-BW within the corresponding duration (e.g., duration 1), the UE may not need to perform CSI measurement (or RRM / RLM measurement) through the CSI-RS configured to be transmitted within the corresponding duration (e.g., duration 1). On the other hand, when signaling / recognizing that CAP-BW is on (in the time slot in which CO-DCI is detected), but not belonging to the first time slot (or the first k time slots) of the DL burst, the UE may monitor the PDCCH belonging to a specific second search space set that is configured to be monitored for the corresponding duration (e.g., duration 2) (for all cells or a portion thereof configured in the unlicensed band), or may monitor a specific second PDCCH configured to be monitored for the corresponding duration (e.g., duration 2). Alternatively, CSI measurements (or RRM / RLM measurements) of the CSI-RS configured to be sent for the corresponding duration (e.g., duration 2) may be performed by the UE. Here, the specific first search space set and the second search space set may be different from each other. For example, the specific first search space set and the second search space set may have different PDCCH monitoring periods. In addition, the specific first PDCCH and the second PDCCH may be different from each other. The DCI formats sent on the specific first PDCCH and the second PDCCH may be different from each other.

[0152] Figure 15 The communication process according to the example of the present disclosure is illustrated. Figure 15 , the UE may receive a group-common DCI in the first cell (S1502). Here, the group-common DCI may include availability information about the RB sets (e.g., CAP-BW) configured in the first cell. In addition, the group-common DCI may include CO-DCI (e.g., DCI format 2_0), and the CRC may be scrambled with a group-common RNTI (e.g., SFI RNTI). Thereafter, based on an indication that all RB sets of the first cell are unavailable, the UE may perform a first PDCCH monitoring in the RB sets of the first cell for a predetermined duration, but may omit channel measurement (e.g., CSI-RS measurement) (S1504). Based on an indication that at least one of the RB sets of the first cell is available, the UE may perform a second PDCCH monitoring and channel measurement in at least one available RB set of the first cell (S1506).

[0153] Here, each RB set is a unit in which CAP is performed and may include one or more consecutive RBs. In addition, on the basis of configuring multiple RB sets in the first cell and configuring the first transmission mode, 1 bit may be used to jointly indicate the availability of multiple RB sets for all RB sets. In addition, on the basis of configuring the second transmission mode, multiple bits may be used to separately indicate the availability of multiple RB sets for each RB set in the RB set. The group-common DCI may also include available information about the RB set of the second cell. Based on the indication that all RB sets corresponding to the first cell are unavailable and the RB set of the second cell is unavailable, the UE may operate based on the assumption that the RB set of the second cell belongs to the first time slot duration of the DL transmission. In addition, the first PDCCH monitoring may operate under the assumption that the RB set of the second cell belongs to the first time slot duration of the DL transmission. The first search space set and the second search space set may be different from each other (for example, in terms of the PDCCH monitoring period).

[0154] [Method #3] Method for configuring time domain DL / UL direction

[0155] The Maximum Channel Occupancy Time (MCOT) can be determined based on the priority class corresponding to the CAP executed by the BS (see Table 9), and the BS can set a time less than or equal to the MCOT as its COT duration. In this case, the BS can notify the UE of a COT less than or equal to the MCOT as the COT duration. Therefore, the UE can perform PDCCH monitoring configured outside the COT duration. For example, outside the COT duration, it does not know when the BS will transmit the PDCCH. Therefore, monitoring can be performed very frequently, but at a much slower pace during the COT duration. Such monitoring can be beneficial in terms of UE power consumption. In addition, the UE can distinguish between UL transmissions within the COT duration and UL transmissions outside the COT duration. In the case of UL transmissions within the COT duration, channel idle / busy determination can be made only for a predetermined period of time. When the channel is idle, UL transmission can be allowed without random backoff. Alternatively, UL transmission can be allowed after a predetermined time without determining whether the channel is idle / busy. On the other hand, in the case of UL transmissions outside the COT duration, UL transmission can be allowed only when a CAP with random backoff is executed.

[0156] [Method #3-1] Explicitly signaling the COT duration in the CO-DCI

[0157] In the CO-DCI, the COT start slot index and / or COT last slot index and / or the COT duration from a specific slot can be signaled via separate fields. This field can be configured per CAP-BW, per carrier / active BWP, or commonly for a group of CAP-BWs, a group of carriers / active BWPs, or an unlicensed band.

[0158] There may be a difference between the duration for which SFI information is applied and the COT duration. For example, when the period for monitoring CO-DCI is set to 4 time slots, the COT information in the COT-DCI may indicate that the COT duration is 1 time slot. In this case, the SFI information should include information about at least 4 time slots, and how the UE should interpret the SFI information indicated for the remaining 3 time slots may be a challenge.

[0159] For example, when the SFI information in the SFI field corresponds to k slots and the time when the CO-DCI is received is slot #n, the DL / UL information corresponding to slot #n to slot #n+k-1 can be signaled via the SFI information. In this case, the last slot index indicated by the field indicating the COT duration may be after slot #n+k-1. In this case, the SFI information can be applied to the DL / UL information corresponding to slot #n to slot #n+k-1, but an assumption may be required for the DL / UL information after slot #n+k-1. The following discusses the method of assuming by the UE.

[0160] Option 1) By applying a wrap-around scheme, a rule may be set such that the SFI information corresponding to slot #n+k corresponds to slot #n, and the SFI information corresponding to slot #n+k+1 corresponds to slot #n+1.

[0161] Option 2) A rule may be set such that the SFI in slot #n+k-1 (or corresponding to the last symbol of slot #n+k-1) is repeated after slot #n+k-1.

[0162] Option 3) A rule may be set such that a specific SFI (eg, all DL or all UL) is repeated after slot #n+k-1.

[0163] Option 4) Rules may be set so that the UE does not expect the above situation. Alternatively, the UE may expect to receive DL / UL information in the corresponding duration by receiving additional CO-DCI, and if it fails to receive the information, one of options 1 to 3 may be applied.

[0164] [Method #3-2] Implicitly signaling the COT duration through a combination of specific SFIs in the CO-DCI

[0165] The SFI information of slot #k may be duplicated / transmitted in slot #n and slot #m. Here, when the SFI information corresponding to slot #k signaled in slot #n is A, and the SFI information corresponding to slot #k signaled in slot #m is B, slot #k may be defined as the last slot of the COT occupied by the BS. For example, A may be all DL, and B may be all UL.

[0166] SFI information may exist after the last slot index of the COT identified by [Method #3-1] and / or [Method #3-2]. For example, the SFI information of CAP-BW #1-1 of the CO-DCI received in slot #n may extend to slot #n+k, but the last slot index of the COT indicated by the CO-DCI may be slot #n+k-2. In this regard, a method for processing SFI information of slot #n+k-1 and slot #n+k is proposed.

[0167] Option A) The SFI information of slot #n+k-1 and slot #n+k may be ignored. For example, even when the UE receives the SFI information of slot #n+k-1 and slot #n+k, it may operate as if it has not received the SFI information of slot #n+k-1 and slot #n+k.

[0168] Option B) Only UL information in the SFI information of slots #n+k-1 and #n+k may be considered valid. In this case, the UE may not perform PDCCH monitoring in the corresponding UL duration and may identify this duration as a UL duration outside the COT duration.

[0169] Option C) The UE may not expect this to happen.

[0170] [Method #4] When sending CO-DCI, a group of carriers / active BWPs and / or CAP-BWs may be configured. Rules may be set such that all SFI information and on / off information for carriers / active BWPs and / or CAP-BWs belonging to the configured group are included in the CO-DCI, and the CO-DCI is sent on all carriers / active BWPs and / or CAP-BWs belonging to the configured group.

[0171] 2) Sender (Entity B (e.g., BS))

[0172] [Method #1A] Allocate the SFI field in CO-DCI for each CAP-BW

[0173] For example, in Figure 10 In the CA scenario, N1 can be allocated for CAP-BW#1-1, N2 can be allocated for CAP-BW#1-2, N3 can be allocated for CAP-BW#2-1, and N4 can be allocated for CAP-BW#3-1, as shown in FIG. Figure 11 As shown in FIG. 4 , the SFI for each CAP-BW can be indicated in the CO-DCI.

[0174] [Method #1A-1] Configure the SFI field for each CAP-BW in the CO-DCI, where a specific CAP-BW can be shared Share the same offset value

[0175] exist Figure 11In the CO-DCI, all or part of N1 / N2 / N3 / N4 can be set to the same value. For example, CAP-BW#1-1 / #1-2 belong to the same carrier. Therefore, assuming that the BS indicates the same D / U direction for CAP-BW#1-1 / #1-2, the DCI overhead can be reduced by indicating the D / U direction of CAP-BW#1-1 / #1-2 through the same field in CO-DCI. That is, the D / U direction (e.g., SFI field) can be configured for each carrier. However, since the on / off state of CAP-BW#1-1 / #1-2 can also be shared, the on / off state may not be indicated for each CAP-BW. This signaling configuration can implicitly indicate that the BS attempts to perform transmission only when the CAP for both CAP-BW#1-1 and CAP-BW#1-2 belonging to CC#1 is successful, otherwise, it does not send a DL burst. In addition, setting the offsets corresponding to CAP-BW #1-1 / #1-2 belonging to the same carrier to the same value may mean that the RBs corresponding to the guard band present between CAP-BW #1-1 / #1-2 are available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or may be interpreted as meaning that the guard band is not configured).

[0176] Alternatively, a transmission mode related to the transmission method may be configured separately for each CAP-BW of the BS. For example, whether the mode is a mode in which transmission is performed (in all CAP-BWs) only when CAP for all CAP-BWs belonging to the carrier / active BWP is successful (hereinafter, Mode 1), or a mode 2 in which transmission is attempted for some CAP-BWs among the CAP-BWs belonging to the carrier / active BWP when CAP for some CAP-BWs is successful (hereinafter, Mode 2) may be separately signaled. When Mode 1 is configured, the UE may assume that the SFI field is shared for all CAP-BWs belonging to the carrier / active BWP (i.e., the same offset value is set, or an offset value is set for each cell). When Mode 2 is configured, the UE may assume that the SFI field is configured for each CAP-BW belonging to the carrier / active BWP (i.e., a separate offset value is set, or an offset value is set for each CAP-BW).

[0177] In [Method #1A] and [Method #1-1A], the CAP-BW can be indicated as closed (that is, the BS does not attempt to transmit due to CAP failure) by a specific state of the SFI field. As an example, when the SFI field is configured with 3 bits and is set to '000', it can indicate that the CAP-BW corresponding to the SFI field is in the closed state. As another example, when SlotFormatCombination is not linked to a specific state of the SFI field (e.g., SFI-index), the closed state of CAP-BW can be indicated by using this state. The SFI field size can be determined by the maximum number of SFI-indexes that are set. When the SFI field size is 3 bits, SlotFormatCombination may not be configured for some of the 8 SFI-indexes. In this case, when the value of the SFI-index for which SlotFormatCombination is not configured is signaled, the UE can recognize that the corresponding CAP-BW is in the closed state.

[0178] When a CAP-BW is in the closed state, UL slot / symbol information about a CAP-BW in the open state belonging to the same carrier / BWP as the CAP-BW can be conveyed to the CAP-BW in the closed state. As an example, CAP-BW#1-1 can be signaled as being in the closed state, but CAP-BW#1-2 can be signaled as being in the open state (when separate SFI fields are configured for CAP-BW#1-1 and CAP-BW#1-2). In this case, for example, if all symbols of slot #k / k+1 for CAP-BW#1-2 are UL by CO-DCI, the BS can notify CAP-BW#1-1 that slot #k / k+1 is also UL. This is because under the assumption that a BS operating in an unlicensed band generally operates through one radio frequency (RF) module, it can be considered impossible to perform transmission in an adjacent band while performing reception on an adjacent band. Therefore, the BS may inform that during slot #k / k+1, PDCCH monitoring is not performed in CAP-BW #1-1 or CAP-BW #1-2 and configured UL transmission (e.g., periodic / semi-persistent PUCCH / SRS, configured granted PUSCH, etc.) is allowed.

[0179] Furthermore, a specific state of the SFI field can indicate that the corresponding CAP-BW (in the timeslot where CO-DCI is detected) belongs to the first transmission timeslot (e.g., a DL burst) or the first k timeslots in the BS's occupied duration. For example, when the SFI field is configured with 3 bits and is set to '111', it can indicate that the CAP-BW corresponding to the SFI field (in the timeslot where CO-DCI is detected) belongs to the first timeslot (or the first k timeslots) of the DL burst. As another example, this state can be utilized when SlotFormatCombination is not linked to a specific state of the SFI field (e.g., SFI-index). The SFI field size can be determined by the maximum number of configured SFI-indexes. When the SFI field size is 3 bits, SlotFormatCombination may not be configured for some of the 8 SFI-indexes. In this case, when signaling the value of the SFI-index for which SlotFormatCombination is not configured, the BS can indicate that the CAP-BW belongs to the first timeslot (or the first k timeslots) of the DL burst (in the timeslot where CO-DCI is detected). In this case, the BS can notify that DL is configured in the first time slot (or the first k time slots) of the DL burst (for all cells or a portion thereof configured in the unlicensed band). That is, in the time slot in which the CAP-BW is identified as belonging to the first time slot (or the first k time slots) of the DL burst, all symbols can be assumed to be DL. Therefore, the BS can perform PDCCH transmission in the CAP-BW under the assumption that all symbols in the time slot are DL. In this method, in order to update the time slot format of the CAP-BW, the BS can send DCI format 2_0 again within the same DL burst. For example, upon receiving SFI=111, the UE can only recognize that the CAP-BW is the start of a DL burst, and identify the time slot format (e.g., D / U / F) in the DL burst / COT based on the updated SFI information, while monitoring the PDCCH as in the case where the CAP-BW is outside the DL burst.

[0180] In addition, the BS's channel occupancy or DL ​​burst can be divided into two durations (for all cells or a portion thereof configured in the unlicensed band), and the search space set (or PDCCH) can be configured independently for each duration. For example, duration 1 can be defined as the duration within the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells or a portion thereof configured in the unlicensed band), and duration 2 can be defined as the duration after the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells or a portion thereof configured in the unlicensed band). Here, k can be predefined as an integer greater than or equal to 1, or can be set through separate RRC signaling. Specifically, when signaling / recognizing that CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst (in the time slot in which CO-DCI is detected), the BS can send a PDCCH (for all cells or a portion thereof configured in the unlicensed band) through a specific first search space set within the corresponding duration (e.g., duration 1), or can send a specific first PDCCH within the corresponding duration (e.g., duration 1). On the other hand, when signaling / recognizing that CAP-BW is on (in the time slot in which CO-DCI is detected), but not belonging to the first time slot (or the first k time slots) of the DL burst, the BS may send a PDCCH (for all cells or a portion thereof configured in the unlicensed band) through a specific second search space set within the corresponding duration (e.g., duration 2), or may send a specific second PDCCH within the corresponding duration (e.g., duration 2). Here, the specific first search space set and the second search space set may be different from each other. For example, the specific first search space set and the second search space set may have different PDCCH monitoring periods. In addition, the specific first PDCCH and the second PDCCH may be different from each other. For example, the DCI formats sent on the specific first PDCCH and the second PDCCH may be different from each other. For example, the DCI format sent on the specific first PDCCH may include a group common DCI format (e.g., DCI format 2_0). Furthermore, the DCI format transmitted on the specific second PDCCH may include a DCI format for data scheduling (eg, DCI format 0_X / 1_X) and a group common DCI format (eg, DCI format 2_0).

[0181] [Method #2A] Allocate the SFI field for each CAP-BW in the CO-DCI and configure it through a separate field A bitmap indicating the on / off status of each CAP-BW

[0182] In such Figure 10In the CA scenario shown, N1 can be assigned to CAP-BW#1-1, N2 can be assigned to CAP-BW#1-2, N3 can be assigned to CAP-BW#2-1, and N4 can be assigned to CAP-BW#3-1, as shown in FIG. Figure 12 As shown in FIG. , the on / off state and SFI can be indicated for each CAP-BW in CO-DCI. Although the SFI field and the field indicating on / off are shown as being positioned consecutively in the figure, the bit indicating the on / off state can be added after the SFI field, or the bitmap or bit field indicating on / off can be configured with a separate offset value for each CAP-BW.

[0183] [Method #2A-1] Configure the SFI field for each CAP-BW in CO-DCI and pass it through a separate word The bitmap for indicating the on / off status of each CAP-BW is configured in the segment, where a specific CAP-BW can be shared. Share SFI field and / or Bit field value indicating on / off status

[0184] exist Figure 12 In the CO-DCI, all or part of N1 / N2 / N3 / N4 can be set to the same value. For example, CAP-BW#1-1 / #1-2 belong to the same carrier. Therefore, assuming that the BS indicates the same D / U direction for CAP-BW#1-1 / #1-2, the DCI overhead can be reduced by indicating the D / U direction of CAP-BW#1-1 / #1-2 through the same field in CO-DCI. That is, the D / U direction (e.g., SFI field) can be configured for each carrier. However, since the on / off state of CAP-BW#1-1 / #1-2 can also be shared, the on / off state may not be indicated for each CAP-BW. This signaling configuration can implicitly indicate that the BS attempts to perform transmission only when the CAP for both CAP-BW#1-1 and CAP-BW#1-2 belonging to CC#1 is successful, otherwise, it does not send a DL burst. In addition, setting the offsets corresponding to CAP-BW #1-1 / #1-2 belonging to the same carrier to the same value may mean that the RBs corresponding to the guard band present between CAP-BW #1-1 / #1-2 are available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or may be interpreted as meaning that the guard band is not configured).

[0185] Alternatively, the transmission mode associated with the transmission method can be configured individually for each CAP-BW of the BS. For example, the BS can individually signal whether the mode is a mode in which transmission is performed (across all CAP-BWs) only when CAP for all CAP-BWs belonging to the carrier / active BWP succeeds (hereinafter, Mode 1), or a mode 2 in which transmission is attempted for some CAP-BWs belonging to the carrier / active BWP when CAP for some CAP-BWs succeeds (hereinafter, Mode 2). When Mode 1 is configured, the BS can assume that the SFI field and bitmap field are shared for all CAP-BWs belonging to the carrier / active BWP (e.g., only one bit is configured for the bitmap field corresponding to the cell, and only one SFI field is configured). When Mode 2 is configured, the BS can assume that the bit field in the bitmap is configured for each CAP-BW belonging to the carrier / active BWP (that is, the offset value of the SFI field and the bitmap field are configured for each CAP-BW).

[0186] As another example, Figure 13 As shown, the offset value of N1 can be commonly set for the SFI fields of CAP-BW#1-1 / 1-2 / 2-1 / 3-1. Furthermore, in the bitmap indicating the on / off status, the offset values ​​of N2 / N3 / N4 / N5 can be set for each CAP-BW, or all or some of N2 / N3 / N4 / N5 can be set to the same value. If N2 and N3 are set to the same value, the on / off status of CAP-BW#1-1 / #1-2 can also be shared, and thus the on / off status may not be indicated for each CAP-BW. This signaling configuration can implicitly instruct the BS to attempt transmission only if the CAP for both CAP-BW#1-1 and CAP-BW#1-2 belonging to CC#1 is successful; otherwise, it does not send a DL burst. In addition, setting the offsets corresponding to CAP-BW #1-1 / #1-2 belonging to the same carrier to the same value may mean that the RBs corresponding to the guard band present between CAP-BW #1-1 / #1-2 are available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or may be interpreted as meaning that the guard band is not configured).

[0187] As another example, Figure 14As shown, for each CC (or BWP), a common offset N1 (relative to the SFI field position) can be set, and the bitmap indicating the on / off status can be signaled through a k-bit bitmap after the offset value (or before the offset value, after the end of the field size configured after N1, after the field size configured after N1). Here, k can be equal to the number of CAP-BWs corresponding to the CC (or BWP), and can be less than or equal to the number of CAP-BWs corresponding to the CC (or BWP). When k is less than the CAP-BW, the value of k can be signaled separately. In addition, when k is less than the CAP-BW, the relationship between each bit of the k-bit bitmap and the corresponding CAP-BW can be pre-configured by the BS. When k=1, the on / off status of CAP-BW#1-1 / #1-2 can also be shared, so the on / off status may not be indicated for each CAP-BW. This signaling configuration can implicitly instruct the BS to attempt to perform transmission only when the CAP for both CAP-BW #1-1 and CAP-BW #1-2 belonging to CC #1 is successful, otherwise it does not send a DL burst. In addition, setting the bit value corresponding to the on / off state of CAP-BW #1-1 / #1-2 belonging to the same carrier to the same position can mean that the RB corresponding to the guard band existing between CAP-BW #1-1 / #1-2 is available (e.g., mapped / transmitted) (e.g., for PDCCH, PDSCH and / or CSI-RS transmission) (or it can be interpreted as meaning that the guard band is not configured).

[0188] Alternatively, the transmission mode associated with the transmission method can be configured separately for each CAP-BW of the BS. For example, the BS can separately signal whether the mode is a mode in which transmission is performed (across all CAP-BWs) only when CAP for all CAP-BWs belonging to the carrier / active BWP is successful (hereinafter, Mode 1), or Mode 2 in which transmission is attempted for some CAP-BWs belonging to the carrier / active BWP when CAP for some CAP-BWs is successful (hereinafter, Mode 2). When Mode 1 is configured, the BS can assume that the bitmap field indicating the on / off state is shared for all CAP-BWs belonging to the carrier / active BWP (that is, only one bit is configured for the bitmap field corresponding to the cell). Alternatively, if the bit field in the bitmap is configured for each CAP-BW belonging to the carrier / active BWP when Mode 1 is configured, the BS can assume that only '1' or '0' is signaled in the bitmap. When mode 2 is configured, the BS may assume that a bit field in the bitmap is configured for each CAP-BW belonging to a carrier / active BWP (that is, an offset value of the bitmap field is set for each CAP-BW).

[0189] In [Method #2A] and [Method #2-1A], the BS may notify that if the 1-bit information corresponding to each CAP-BW is '0' (or '1'), the corresponding CAP-BW is closed, and if the information is '1' (or '0'), the corresponding CAP-BW is opened. When a CAP-BW is in the closed state, UL slot / symbol information about the CAP-BW in the opened state belonging to the same carrier / BWP or the same frequency band as the CAP-BW may be conveyed to the CAP-BW in the closed state. As an example, CAP-BW #1-1 may be signaled as being in the closed state, but CAP-BW #1-2 may be signaled as being in the opened state (when the opening / closing information about CAP-BW #1-1 and the opening / closing information about CAP-BW #1-2 are signaled through separate bit fields and the SFI field is signaled in common). In this case, for example, if all symbols of slot #k / k+1 for CAP-BW #1-2 are UL by CO-DCI signaling, the UE can recognize that CAP-BW #1-1 is also UL for slot #k / k+1. This is because, under the assumption that a BS operating in an unlicensed band generally operates with one radio frequency (RF) module, it can be considered impossible to perform transmission in an adjacent band while performing reception on an adjacent band. Therefore, the BS can notify that during slot #k / k+1, PDCCH monitoring is not performed in CAP-BW #1-1 or CAP-BW #1-2, and configured UL transmission (e.g., periodic / semi-persistent PUCCH / SRS, configured granted PUSCH, etc.) is allowed.

[0190] Alternatively, even if CAP-BW is signaled as being in the OFF state, the BS can recognize that the UL information on the SFI signaling corresponding to the CAP-BW is valid. As an example, when CAP-BW #1-1 is signaled as being in the OFF state, and all symbols of slot #k / k+1 are signaled as DL and all symbols of slot #k+2 / k+3 are signaled as UL for CAP-BW #1-1, the BS can notify that slots #k+2 / k+3 are UL and ignore the SFI signaling in slot #k / k+1. In this case, the BS can notify that PDCCH monitoring is not performed in CAP-BW #1-1 during slots #k / k+1 / k+2 / k+3, and that configured UL transmissions (e.g., periodic / semi-persistent PUCCH / SRS, configured granted PUSCH, etc.) are allowed during slots #k+2 / k+3.

[0191] Alternatively, specific states of the SFI field and / or bitmap field can indicate that the CAP-BW (in the time slot in which the CO-DCI is detected) belongs to the first transmission time slot (e.g., a DL burst) or the first k time slots in the duration occupied by the BS. Here, the value of k can be predefined as an integer greater than or equal to 1, or can be set by separate RRC signaling. As one method, when all bits in the bitmap corresponding to all CAP-BWs corresponding to the cell in which the CO-DCI is transmitted indicate off, it can indicate that the CAP-BW (in the time slot in which the CO-DCI is detected) belongs to the first time slot (or the first k time slots) of the DL burst. Paradoxically, when CO-DCI is transmitted from a cell, all CAP-BWs corresponding to the cell are off. Therefore, this transmission can be used for the above-mentioned signaling. That is, through CO-DCI transmission, this can indirectly indicate that the CAP-BW is on. In addition, through the CAP-BW on / off information, this can indicate that the CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst. For example, when CO-DCI is transmitted on CC#1, if all on / off information corresponding to CAP-BW#1-1 and CAP-BW#1-2 in the bitmap is off, this may indicate that CAP-BW#1-1 and CAP-BW#1-2 (in the time slot in which CO-DCI is detected) belong to the first time slot (or the first k time slots) of the DL burst.

[0192] In addition, CO-DCI can be sent on CC#A, and all on / off information corresponding to CC#A / B can be included in the CO-DCI (i.e., cross-carrier indication). At this time, since the CAP-BW on / off information of CC#B is sent on another CC (e.g., CC#A), it may be unclear whether there is actual transmission by the BS on CC#B. Therefore, if all CAP-BWs of CC#A are turned off, the UE can assume that the DL burst starts even on CC#B (even if the transmission is actually performed only on CC#A). On the other hand, if some or all of CC#A's CAP-BWs are later updated to on, the information about CC#B can be recognized as truly off only when all CAP-BW on / off information of CC#B is off. For example, CO-DCI can be sent on CC#1, and all on / off information corresponding to CC#1 / 2 / 3 can be included in the CO-DCI. In this case, the BS that transmits CO-DCI in which all on / off information in the bitmap corresponding to CAP-BW#1-1 / CAP-BW#1-2 / CAP-BW#2-1 / CAP-BW#3-1 is off can inform the UE that CC#2 and CC#3, as well as CC#1 (in the time slot in which CO-DCI is detected), belong to the first time slot (or the first k time slots) of the DL burst. In addition, CO-DCI can be transmitted on CC#2, and all on / off information corresponding to CC#1 / 2 / 3 can be included in the CO-DCI. In this case, the BS that transmits CO-DCI including bitmap information corresponding to CAP-BW #1-1 = Off, CAP-BW #1-2 = Off, CAP-BW #2-1 = On, and CAP-BW #3-1 = Off on CC #2 can inform the UE that neither CAP-BW #1-1 nor CAP-BW #1-2 belonging to CC #1 belongs to the first slot (or first k slots) of the DL burst, because CC #2 does not belong to the first slot (or first k slots) of the DL burst (in the slot where CO-DCI is detected). Therefore, the UE can recognize that actual DL reception is not available in CAP-BW #1-1 and CAP-BW #1-2.

[0193] As an example, when the SFI field is configured as 3 bits and is set to '111', it may indicate that the CAP-BW corresponding to the SFI field (in the time slot in which the CO-DCI is detected) belongs to the first time slot (or the first k time slots) of the DL burst. As another example, when SlotFormatCombination is not linked to a specific state of the SFI field (e.g., SFI-index), this state may be utilized. The SFI field size may be determined by the maximum number of SFI-indexes set. When the SFI field size is 3 bits, SlotFormatCombination may not be configured for some of the 8 SFI-indexes. In this case, when the value of the SFI-index for which SlotFormatCombination is not configured is signaled, the UE may recognize that the CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst (in the time slot in which the CO-DCI is detected). The UE may then assume DL (for all cells or a portion thereof configured in the unlicensed band) during the first time slot (or the first k time slots) of the DL burst. That is, in a time slot in which the CAP-BW is identified as the first time slot (or the first k time slots) belonging to a DL burst, all symbols may be assumed to be DL. Therefore, the UE may perform PDCCH monitoring in the CAP-BW under the assumption that all symbols in the time slot are DL. In this method, in order to update the time slot format of the CAP-BW, the BS may send DCI format 2_0 again within the same DL burst. For example, upon receiving SFI=111, the UE may only recognize that the CAP-BW is the start of a DL burst and identify the time slot format (e.g., D / U / F) in the DL burst / COT based on the updated SFI information, while monitoring the PDCCH as in the case where the CAP-BW is outside the DL burst.

[0194] In addition, the BS's channel occupancy or DL ​​burst can be divided into two durations (for all cells or a portion thereof configured in the unlicensed band), and the search space set (or PDCCH) to be monitored can be configured independently for each duration. For example, duration 1 can be defined as the duration within the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells or a portion thereof configured in the unlicensed band), and duration 2 can be defined as the duration after the first k time slots in the BS's channel occupancy or DL ​​burst (for all cells or a portion thereof configured in the unlicensed band). Here, k can be predefined as an integer greater than or equal to 1, or can be set through separate RRC signaling. Specifically, when signaling / recognizing that CAP-BW belongs to the first time slot (or the first k time slots) of the DL burst (in the time slot where CO-DCI is detected), the BS can send a PDCCH (for all cells or a portion thereof configured in the unlicensed band) through a specific first search space set within the corresponding duration (e.g., duration 1), or can send a specific first PDCCH within the corresponding duration (e.g., duration 1). Alternatively, since it is uncertain whether the CSI-RS is transmitted in the CAP-BW during the corresponding duration (e.g., Duration 1), the BS may not expect a report from the UE regarding CSI measurements (or RRM / RLM measurements) using the CSI-RS configured to be transmitted during the corresponding duration (e.g., Duration 1). On the other hand, when signaling / recognizing that the CAP-BW is on (in the time slot in which the CO-DCI is detected), but not belonging to the first time slot (or the first k time slots) of the DL burst, the BS may transmit a PDCCH belonging to a specific second search space set (for all cells or a portion thereof configured in the unlicensed band) during the corresponding duration (e.g., Duration 2), or may transmit a specific second PDCCH during the corresponding duration (e.g., Duration 2). Alternatively, the BS may not expect a report from the UE regarding CSI measurements (or RRM / RLM measurements) using the CSI-RS configured to be transmitted during the corresponding duration (e.g., Duration 2). Here, the specific first search space set and the second search space set may be different from each other. For example, the specific first search space set and the second search space set may have different PDCCH monitoring periods. In addition, the specific first PDCCH and the second PDCCH may be different from each other. The DCI formats sent on the specific first PDCCH and the second PDCCH may be different from each other.

[0195] [Method #3A] Method for configuring time domain DL / UL direction

[0196] The Maximum Channel Occupancy Time (MCOT) can be determined based on the priority class corresponding to the CAP executed by the BS (see Table 9), and the BS can set a time less than or equal to the MCOT as its COT duration. In this case, the BS can notify the UE of a COT less than or equal to the MCOT as the COT duration. Therefore, the UE can perform PDCCH monitoring configured outside the COT duration. For example, outside the COT duration, it does not know when the BS will transmit the PDCCH. Therefore, monitoring can be performed very frequently, but at a much slower pace during the COT duration. Such monitoring can be beneficial in terms of UE power consumption. In addition, the UE can distinguish between UL transmissions within the COT duration and UL transmissions outside the COT duration. In the case of UL transmissions within the COT duration, channel idle / busy determination can be made only for a predetermined period of time. When the channel is idle, UL transmission can be allowed without random backoff. Alternatively, UL transmission can be allowed after a predetermined time without determining whether the channel is idle / busy. On the other hand, in the case of UL transmissions outside the COT duration, UL transmission can be allowed only when a CAP with random backoff is executed.

[0197] [Method #3A-1] Explicitly signaling COT duration in CO-DCI

[0198] In the CO-DCI, the COT start slot index and / or COT last slot index and / or the COT duration from a specific slot can be signaled via separate fields. This field can be configured per CAP-BW, per carrier / active BWP, or commonly for a group of CAP-BWs, a group of carriers / active BWPs, or an unlicensed band.

[0199] There may be a difference between the duration for which SFI information is applied and the COT duration. For example, when the period for monitoring CO-DCI is set to 4 time slots, the COT information in the COT-DCI may indicate that the COT duration is 1 time slot. In this case, the SFI information should include information about at least 4 time slots, and how the UE should interpret the SFI information indicated for the remaining 3 time slots may be a challenge.

[0200] For example, when the SFI information in the SFI field corresponds to k slots and the time when the CO-DCI is received is slot #n, the DL / UL information corresponding to slot #n to slot #n+k-1 can be signaled via the SFI information. In this case, the last slot index indicated by the field indicating the COT duration may be after slot #n+k-1. In this case, the SFI information can be applied to the DL / UL information corresponding to slot #n to slot #n+k-1, but an assumption may be required for the DL / UL information after slot #n+k-1. The following discusses the method of assuming by the UE.

[0201] Option 1) By applying a wrap-around scheme, a rule may be set such that the SFI information corresponding to slot #n+k corresponds to slot #n, and the SFI information corresponding to slot #n+k+1 corresponds to slot #n+1.

[0202] Option 2) A rule may be set such that the SFI in slot #n+k-1 (or corresponding to the last symbol of slot #n+k-1) is repeated after slot #n+k-1.

[0203] Option 3) A rule may be set such that a specific SFI (eg, all DL or all UL) is repeated after slot #n+k-1.

[0204] Option 4) Rules may be set so that the UE does not expect the above situation. Alternatively, the UE may expect to receive DL / UL information in the corresponding duration by receiving additional CO-DCI, and if it fails to receive the information, one of options 1 to 3 may be applied.

[0205] [Method #3A-2] Implicitly signaling the COT duration through a combination of specific SFIs in the CO-DCI

[0206] The SFI information of slot #k may be duplicated / transmitted in slot #n and slot #m. Here, when the SFI information corresponding to slot #k signaled in slot #n is A, and the SFI information corresponding to slot #k signaled in slot #m is B, slot #k may be defined as the last slot of the COT occupied by the BS. For example, A may be all DL, and B may be all UL.

[0207] SFI information may exist after the last slot index of the COT identified by [Method #3-1] and / or [Method #3-2]. For example, the SFI information of CAP-BW #1-1 of the CO-DCI received in slot #n may extend to slot #n+k, but the last slot index of the COT indicated by the CO-DCI may be slot #n+k-2. In this regard, a method for processing SFI information of slot #n+k-1 and slot #n+k is proposed.

[0208] Option A) The SFI information of slot #n+k-1 and slot #n+k can be ignored. For example, even if the UE receives the SFI information of slot #n+k-1 and slot #n+k, it can operate as if it has not received the SFI information of slot #n+k-1 and slot #n+k. Therefore, communication can be performed based on the SFI information within the COT duration only.

[0209] Option B) Only the UL information in the SFI information of slots #n+k-1 and #n+k can be considered valid. Therefore, the UE may not perform PDCCH monitoring during the corresponding UL duration and may recognize this duration as a UL duration outside the COT duration. That is, during slots #n+k-1 and #n+k, the UE may not perform PDCCH monitoring and may recognize the UL duration of slots #n+k-1 and #n+k as a UL duration outside the COT duration.

[0210] Option C) The UE may not expect this to happen.

[0211] [Method #4A] When sending CO-DCI, a group of carriers / active BWPs and / or CAP-BWs may be configured. Rules may be set such that all SFI information and on / off information for carriers / active BWPs and / or CAP-BWs belonging to the configured group are included in the CO-DCI, and the CO-DCI is sent on all carriers / active BWPs and / or CAP-BWs belonging to the configured group.

[0212] 3) Receiver & Transmitter (between the receiver and the transmitter)

[0213] like Figure 16 As shown, first, the UE may receive the configuration of the CCs and the BWP of each CC in the unlicensed band from the BS (S1602). In addition, the UE may receive the configuration of the CC group from the BS. Such a configuration may be established based on high-layer (e.g., RRC) signaling and / or DCI. In addition, the SFI field in the CO-DCI corresponding to the CAP-BW in the CC group, and / or the bitmap field indicating the CAP-BW on / off state, and / or the COT duration information field may be allocated to the UE by the BS (S1604). Here, the configuration for allocation may be established based on high-layer (e.g., RRC) signaling and / or DCI. For example, information about the starting position of the information in the CO-DCI (e.g., offset) may be shared through high-layer signaling.

[0214] Thereafter, the UE may receive CO-DCI from the BS (S1606). Here, the CO-DCI may be sent in an unlicensed band or a licensed band. In this case, the UE may receive on / off information, DL / UL information, and / or COT duration information about the corresponding CAP-BW based on the field information configured in the CO-DCI. In this case, based on the received information, the UE may achieve a power saving effect by skipping PDCCH monitoring and / or channel measurement for the CAP-BW that is in an off state or in the UL duration. In addition, the BS may send a signal to the UE through the unlicensed band occupied by the BS based on the CO-DCI. In response, the UE may receive a signal through the unlicensed band occupied by the BS based on the CO-DCI.

[0215] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described herein may be applied to, but not limited to, various fields requiring wireless communication / connectivity (e.g., 5G) between devices.

[0216] More specific examples will be described below with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise specified, similar reference numerals represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0217] Figure 17 A communication system 1 applied to the present disclosure is illustrated.

[0218] Reference Figure 17, the communication system 1 applied to the present disclosure includes a wireless device, a BS and a network. The wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or new RAT) or LTE), also known as a communication / radio / 5G device. The wireless device may include, but is not limited to: a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an IoT device 100f and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with wireless communication capabilities, an autonomous vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication. In this article, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television (TV), a smart phone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptops). Home appliances may include televisions, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, the BS and network may be implemented as wireless devices, and a specific wireless device 200a may serve as a BS / network node for other wireless devices.

[0219] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS 200 / network 300, wireless devices 100a to 100f can communicate directly with each other (e.g., sidelink communication) without the intervention of the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., V2V / Vehicle-to-Everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0220] Wireless communications / connections 150a, 150b, and 150c may be established between wireless devices 100a to 100f / BS 200, and between BSs 200. Hereinafter, wireless communications / connections may be established via various RATs (e.g., 5G NR), such as UL / DL communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay or integrated access backhaul (IAB)). Wireless signals may be transmitted and received between wireless devices, between wireless devices and BSs, and between BSs via the wireless communications / connections 150a, 150b, and 150c. For example, signals may be transmitted and received over various physical channels via the wireless communications / connections 150a, 150b, and 150c. To this end, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for transmitting / receiving wireless signals may be performed based on various proposals of the present disclosure.

[0221] Figure 18 A wireless device suitable for use with the present disclosure is illustrated.

[0222] Reference Figure 18 , the first wireless device 100 and the second wireless device 200 can transmit wireless signals through various RATs (e.g., LTE and NR). {The first wireless device 100 and the second wireless device 200} may correspond to Figure 17 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0223] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may also include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor 102 may process information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals through the transceiver 106. The processor 102 may receive a wireless signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals 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 store software code including instructions for executing all or part of the processing controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive wireless signals via one or more antennas 108. Each of the transceivers 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 disclosure, a wireless device may be a communication modem / circuit / chip.

[0224] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor 202 may process information in the memory 204 to generate third information / signals, and then transmit a wireless signal including the third information / signals through the transceiver 206. The processor 202 may receive a wireless signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing all or part of the processing controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive wireless signals via one or more antennas 208. Each of the transceivers 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0225] The hardware elements of the wireless devices 100 and 200 will now be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)). The one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document and provide the messages, control information, data, or information to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, an SDU, a message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from the one or more transceivers 106 and 206, and obtain the PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0226] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 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 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in one or more processors 102 and 202, or may be stored in one or more memories 104 and 204 and executed by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, instructions and / or instruction sets using firmware or software.

[0227] One or more memories 104 and 204 can be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 can be configured to include read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cache memory, computer-readable storage media and / or combinations thereof. One or more memories 104 and 204 can be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 can be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0228] One or more transceivers 106 and 206 may transmit user data, control information, and / or wireless signals / channels described in the methods and / or operational flowcharts of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or wireless signals / channels described in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive wireless signals. For example, one or more processors 102 and 202 may control one or more transceivers 106 and 206 to transmit user data, control information, or wireless signals to one or more other devices. One or more processors 102 and 202 may control one or more transceivers 106 and 206 to receive user data, control information, or wireless signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or wireless signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received wireless signals / channels from RF band signals to baseband signals to facilitate processing of the received user data, control information, and wireless signals / channels using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, and wireless signals / channels processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0229] Herein, at least one memory (e.g., 104 or 204) may store instructions or programs. When executed, the instructions or programs may cause at least one processor operably coupled to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0230] In the present disclosure, a computer-readable (storage) medium may store at least one instruction or computer program, wherein the at least one instruction or computer program may cause the at least one processor to perform operations according to some embodiments or implementations of the present disclosure when executed by the at least one processor.

[0231] In the present disclosure, a processing device or apparatus may include at least one processor and at least one computer memory connectable to the at least one processor. The at least one computer memory may store instructions or programs. When executed, the instructions or programs may cause the at least one processor operably connected to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0232] Figure 19 Another example of a wireless device applied to the present disclosure is illustrated. The wireless device can be implemented in various forms according to use cases / services (see Figure 17 ).

[0233] Reference Figure 19 , wireless devices 100 and 200 can communicate with Figure 18 The wireless devices 100 and 200 correspond to each other and may be configured to include various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit 110 may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 18 The one or more processors 102 and 202 and / or the one or more memories 104 and 204 of the present invention may include: Figure 18 The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and provides overall control of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / instructions / information stored in the memory unit 130. The control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 via a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 via the wireless / wired interface in the memory unit 130.

[0234] The additional component 140 may be configured in various ways depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 17 100a), vehicles ( Figure 17 100b-1 and 100b-2), XR devices ( Figure 17 100c), handheld device ( Figure 17 100d), household appliances ( Figure 17 100e), IoT devices ( Figure 17 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, FinTech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 17 400), BS( Figure 17 200), network nodes, etc. Depending on the use case / service, the wireless device can be mobile or fixed.

[0235] exist Figure 19 In the wireless devices 100 and 200, all the various elements, components, units / parts, and / or modules can be connected to each other via a wired interface, or at least a portion thereof can be wirelessly connected via the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 can be connected via a wired interface, and the control unit 120 and the first unit (e.g., 130 and 140) can be wirelessly connected via the communication unit 110. Each element, component, unit / part, and / or module in the wireless devices 100 and 200 can also include one or more elements. For example, the control unit 120 can be configured with a set of one or more processors. For example, the control unit 120 can be configured with a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. In another example, the memory unit 130 can be configured with RAM, dynamic RAM (DRAM), ROM, flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0236] Figure 20 The vehicle or autonomous driving vehicle applied to the present disclosure is illustrated. The vehicle or autonomous driving vehicle can be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0237] Reference Figure 20 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Figure 19 Box 110 / 130 / 140.

[0238] The communication unit 110 can transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, base stations (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling components of the vehicle or autonomous vehicle 100. The control unit 120 may include an ECU. The drive unit 140a can enable the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a powertrain, wheels, brakes, a steering system, and the like. The power supply unit 140b can provide power to the vehicle or autonomous vehicle 100 and may include a wired / wireless charging circuit, a battery, and the like. The sensor unit 140c can acquire information about the vehicle's status, surrounding environment information, user information, and the like. The sensor unit 140 c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a location module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed such as adaptive cruise control, a technology for autonomous driving along a determined path, a driving technology for automatically setting a route when a destination is set, etc.

[0239] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and driving plan from the obtained data. The control unit 120 can control the drive unit 140a so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can aperiodically or periodically obtain the latest traffic information data from the external server and can obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c can obtain information about the vehicle status and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 can transmit information about the vehicle's location, autonomous driving route, and / or driving plan to the external server. The external server can use AI technology to predict traffic information data based on the information collected from the vehicle or autonomous driving vehicle and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0240] The embodiments of the present disclosure described above are combinations of elements and features of the present disclosure. Unless otherwise stated, elements or features may be considered to be selective. Each element or feature may be put into practice without being combined with other elements or features. In addition, the embodiments of the present disclosure may be constructed by combining parts of elements and / or features. The order of operations described in the embodiments of the present disclosure may be rearranged. Some configurations of any one embodiment may be included in another embodiment and may be replaced by corresponding configurations of another embodiment. It will be apparent to those skilled in the art that claims that are not explicitly cited in the appended claims may be presented as combinations of embodiments of the present disclosure, or may be included as new claims through subsequent amendments after submitting this application.

[0241] Those skilled in the art will recognize that the present disclosure may be implemented in other specific ways than those set forth herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above embodiments should be interpreted in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, not by the above description, and all changes coming within the meaning and equivalent range of the appended claims should be included therein.

[0242] Industrial Applicability

[0243] The present disclosure may be applied to a UE, a BS or other devices in a wireless mobile communication system.

Claims

1. A method for use by a user equipment (UE) in a wireless communication system, the method comprising the following steps: receiving configuration information related to an operation mode in an unlicensed spectrum, wherein the operation mode is configured as a first mode or a second mode based on the configuration information; receiving downlink control information including a bitmap field for indicating availability of a plurality of frequency bands in a carrier, the bitmap field corresponding to the operation mode, wherein each frequency band is a subject of a corresponding channel access procedure CAP; and performing downlink reception in at least one frequency band of the plurality of frequency bands indicated by the bitmap field, The operation modes include: - a first mode: when any of the plurality of frequency bands fails in a corresponding CAP, no downlink transmission occurs on all of the plurality of frequency bands in the carrier, and - a second mode: downlink transmission can occur within the multiple frequency bands in the carrier when any of the multiple frequency bands succeeds in a corresponding CAP, wherein, based on the configuration of the first mode, the bitmap field has only 1 bit, the 1 bit is commonly applied to all of the multiple frequency bands in the carrier, and wherein, based on the second mode being configured, the bitmap field has a plurality of bits, each bit being separately applied to a corresponding frequency band in the plurality of frequency bands in the carrier, and all of the plurality of bits having a value of “0” indicates that all of the plurality of frequency bands are included in the first k time slots of a downlink burst, and Here, k is an integer greater than or equal to 1.

2. The method according to claim 1, wherein Based on the first mode being configured, a value of "1" of the bitmap field indicates that all of the plurality of frequency bands are available, and a value of "0" of the bitmap field indicates that all of the plurality of frequency bands are unavailable.

3. The method according to claim 1, wherein Based on the second mode being configured, a value of '1' for each of the plurality of bits included in the bitmap field indicates that a corresponding frequency band among the plurality of frequency bands is available, and a value of '0' for each of the plurality of bits included in the bitmap field indicates that a corresponding frequency band among the plurality of frequency bands is unavailable.

4. The method according to claim 1, wherein Based on the second mode being configured, the downlink transmission can occur in at least one frequency band among the plurality of frequency bands in which the CAP succeeds.

5. A user equipment (UE) for use in a wireless communication system, the UE comprising: at least one processor; as well as at least one computer memory operatively coupled to the at least one processor and configured to, when executed, cause the at least one processor to perform operations comprising: receiving configuration information related to an operation mode in an unlicensed spectrum, wherein the operation mode is configured as a first mode or a second mode based on the configuration information; receiving downlink control information including a bitmap field for indicating availability of a plurality of frequency bands in a carrier, the bitmap field corresponding to the operation mode, wherein each frequency band is a subject of a corresponding channel access procedure CAP; and performing downlink reception in at least one frequency band of the plurality of frequency bands indicated by the bitmap field, The operation modes include: - a first mode: when any of the plurality of frequency bands fails in a corresponding CAP, no downlink transmission occurs on all of the plurality of frequency bands in the carrier, and - a second mode: downlink transmission can occur within the multiple frequency bands in the carrier when any of the multiple frequency bands succeeds in a corresponding CAP, wherein, based on the configuration of the first mode, the bitmap field has only 1 bit, the 1 bit is commonly applied to all of the multiple frequency bands in the carrier, and wherein, based on the second mode being configured, the bitmap field has a plurality of bits, each bit being separately applied to a corresponding frequency band in the plurality of frequency bands in the carrier, and all of the plurality of bits having a value of “0” indicates that all of the plurality of frequency bands are included in the first k time slots of a downlink burst, and Here, k is an integer greater than or equal to 1. The UE according to claim 5 , wherein: Based on the first mode being configured, a value of "1" in the bitmap field indicates that all of the multiple frequency bands in the carrier are available, and a value of "0" in the bitmap field indicates that all of the multiple frequency bands in the carrier are unavailable.

7. The UE according to claim 5, wherein: Based on the second mode being configured, a value of '1' for each of the plurality of bits included in the bitmap field indicates that a corresponding frequency band among the plurality of frequency bands is available, and a value of '0' for each of the plurality of bits included in the bitmap field indicates that a corresponding frequency band among the plurality of frequency bands is unavailable.

8. The UE according to claim 5, wherein: Based on the second mode being configured, the downlink transmission can occur in at least one frequency band among the plurality of frequency bands in which the CAP succeeds.

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