Method and device for transmitting and receiving signals in unlicensed band

Abstract

A method for performing uplink (UL) transmission by a user equipment (UE) in a wireless communication system is disclosed. Specifically, the method includes performing sensing on a plurality of beams, wherein each of the plurality of beams is independently sensed; performing UL transmission through at least one beam among the plurality of beams that is sensed as idle, wherein a counter value for each of the plurality of beams is independently set.

Description

Technical Field

[0001] The present disclosure relates to a method and an apparatus for transmitting and receiving signals in an unlicensed band, and more particularly, to a method and an apparatus for transmitting and receiving signals in an unlicensed band by performing listen-before-talk (LBT) on at least one beam using the at least one beam. Background Art

[0002] As more and more communication devices require greater communication services in line with the current trend, the next-generation fifth-generation (5G) system is needed to provide enhanced wireless broadband communication compared to the traditional LTE system. In the next-generation 5G system, communication scenarios are divided into enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), etc.

[0003] In this article, eMBB is a next-generation mobile communication scenario characterized by high spectral efficiency, high user experience data rate, and high peak data rate, URLLC is a next-generation mobile communication scenario characterized by ultra-high reliability, ultra-low latency, and ultra-high availability (e.g., vehicle-to-everything (V2X), emergency services, and remote control), and mMTC is a next-generation mobile communication scenario characterized by low cost, low energy, short packets, and massive connections (e.g., the Internet of Things (IoT)). Summary of the invention

[0004] Technical issues

[0005] An object of the present disclosure is to provide a method for transmitting and receiving a signal in an unlicensed band and an apparatus thereof.

[0006] Those skilled in the art will appreciate that the objectives that can be achieved by the present disclosure are not limited to what has 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.

[0007] Technical Solution

[0008] According to one aspect of the present disclosure, a method for performing uplink (UL) transmission by a user equipment (UE) in a wireless communication system is provided, comprising: performing sensing on multiple beams, wherein each of the multiple beams is independently sensed; performing the UL transmission through at least one beam among the multiple beams that is sensed as idle, wherein a counter value for each of the multiple beams is independently set.

[0009] Sensing of the multiple beams is performed simultaneously.

[0010] The sensing of the multiple beams is a first type of sensing, wherein performing the UL transmission further includes: based on (i) a first beam among the multiple beams is sensed as idle based on the first type of sensing before the transmission time of the UL transmission corresponding to the first beam, and (ii) the UL transmission has not been performed after the first type of sensing: performing a second type of sensing on the first beam during a duration immediately before the transmission time; and performing the UL transmission based on the first beam being sensed as idle based on the second type of sensing.

[0011] The first type of sensing is based on a random backoff counter, and wherein the second type of sensing is not based on the random backoff counter.

[0012] The method further includes performing the first type of sensing on the first beam based on the first beam being sensed as busy based on the second type of sensing.

[0013] Each beam of the plurality of beams corresponds to a UL transmission among a plurality of UL transmissions, and wherein the plurality of UL transmissions are scheduled simultaneously.

[0014] In another aspect of the present disclosure, a user equipment (UE) for performing uplink (UL) transmission in a wireless communication system is provided herein, comprising: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operably connected to the at least one processor and configured to store instructions, the instructions causing the at least one processor to perform operations when executed. The operations may include: performing sensing on a plurality of beams, wherein each of the plurality of beams is independently sensed; performing the UL transmission through at least one beam among the plurality of beams sensed as idle via the at least one transceiver, wherein a counter value for each of the plurality of beams is independently set.

[0015] Sensing of the multiple beams is performed simultaneously.

[0016] The sensing of the multiple beams is a first type of sensing, wherein performing the UL transmission further includes: based on (i) a first beam among the multiple beams is sensed as idle based on the first type of sensing before the transmission time of the UL transmission corresponding to the first beam, and (ii) the UL transmission has not been performed after the first type of sensing: performing a second type of sensing on the first beam during a duration immediately before the transmission time; and performing the UL transmission based on the first beam being sensed as idle based on the second type of sensing.

[0017] The first type of sensing is based on a random backoff counter, and wherein the second type of sensing is not based on the random backoff counter.

[0018] The method further includes performing the first type of sensing on the first beam based on the first beam being sensed as busy based on the second type of sensing.

[0019] Each beam of the plurality of beams corresponds to a UL transmission among a plurality of UL transmissions, and wherein the plurality of UL transmissions are scheduled simultaneously.

[0020] In another aspect of the present disclosure, an apparatus for performing uplink (UL) transmission in a wireless communication system is provided herein, comprising: at least one processor; and at least one memory, the at least one memory being operably connected to the at least one processor and configured to store instructions, the instructions causing the at least one processor to perform operations when executed. The operations may include: performing sensing on a plurality of beams, wherein each of the plurality of beams is independently sensed; performing the UL transmission through at least one beam among the plurality of beams that is sensed as idle, wherein a counter value for each of the plurality of beams is independently set.

[0021] In another aspect of the present disclosure, a computer-readable storage medium is provided herein, the computer-readable storage medium including at least one computer program, the at least one computer program causing at least one processor to perform operations. The operations may include: performing sensing on a plurality of beams, wherein each of the plurality of beams is independently sensed; performing the UL transmission through at least one beam among the plurality of beams that is sensed as idle, wherein a counter value for each of the plurality of beams is independently set.

[0022] In another aspect of the present disclosure, a method for performing downlink (DL) transmission by a base station (BS) in a wireless communication system is provided, comprising: performing sensing on multiple beams, wherein each of the multiple beams is independently sensed; performing the DL transmission through at least one beam among the multiple beams that is sensed as idle, wherein a counter value for each of the multiple beams is independently set.

[0023] In another aspect of the present disclosure, a base station (BS) for performing downlink (DL) transmission in a wireless communication system is provided herein, comprising: at least one transceiver; at least one processor; and at least one memory, wherein the at least one memory is operably connected to the at least one processor and is configured to store instructions, which, when executed, cause the at least one processor to perform operations, the operations comprising: performing sensing on a plurality of beams, wherein each of the plurality of beams is independently sensed; performing the DL transmission via the at least one transceiver through at least one beam among the plurality of beams that is sensed as idle, wherein a counter value for each of the plurality of beams is independently set.

[0024] Effects of the Invention

[0025] According to the present disclosure, for transmission in a specific beam direction or multi-beam transmission (subjected to time division multiplexing (TDM) and / or space division multiplexing (SDM)), the listen-before-talk (LBT) type to be performed can be determined from wide beam LBT and narrow beam LBT based on Cat-3 LBT or Cat-4 LBT based on a random backoff counter, and the energy detection (ED) threshold can be configured differently according to the transmission type (e.g., unicast or broadcast), so that multiple beams can be sent efficiently and LBT for minimizing interference with other signals can be performed.

[0026] When independent per-beam LBT for multi-beam transmission in TDM and / or SDM format is performed in the direction of multiple beams in the channel occupation time (COT), independent per-beam LBT can be performed in the direction of each beam, or independent per-beam LBT can be performed in the direction of a selected representative beam, so that multi-beam transmission can be efficiently performed in one COT.

[0027] In addition, conditions under which the Configuration Grant - Physical Uplink Shared Channel (CG-PUSCH) and the Dynamic Grant - Physical Uplink Shared Channel (DG-PUSCH) can be continuously sent can be defined so that continuous transmission of CG-PUSCH and DG-PUSCH can be performed efficiently.

[0028] Those skilled in the art will recognize that the effects that can be achieved using the present disclosure are not limited to the contents that have been 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

[0029] Figure 1 illustrates an exemplary uplink (UL) transmission operation of a user equipment (UE);

[0030] Figure 2 The figure shows a wireless communication system supporting unlicensed bands;

[0031] Figure 3 An exemplary method of occupying resources in an unlicensed band is illustrated;

[0032] Figure 4 An exemplary channel access procedure of a UE for UL signal transmission and / or DL ​​signal transmission in an unlicensed band applicable to the present disclosure is illustrated;

[0033] Figure 5 is a diagram illustrating a plurality of listen-before-talk sub-bands (LBT-SBs) suitable for use in the present disclosure;

[0034] Figure 6 is a diagram illustrating analog beamforming in an NR system;

[0035] Figure 7 is a diagram illustrating beam-based LBT and group-based LBT according to an embodiment of the present disclosure;

[0036] Figure 8 is a diagram illustrating a problem occurring when performing beam-based LBT according to an embodiment of the present disclosure;

[0037] Fig. 9 , 10 11 are diagrams illustrating the overall operation process of a UE and a BS according to an embodiment of the present disclosure;

[0038] Fig.12 is a diagram illustrating a method of performing multi-beam transmission according to an embodiment of the present disclosure;

[0039] Fig.13 is a diagram illustrating continuous transmission of CG-PUSCH and DG-PUSCH according to an embodiment of the present disclosure;

[0040] Fig.14 An exemplary communication system applicable to the present disclosure is illustrated;

[0041] Fig.15 illustrates an exemplary wireless device suitable for use with the present disclosure; and

[0042] Fig.16 An exemplary vehicle or autonomous vehicle suitable for use with the present disclosure is shown. DETAILED DESCRIPTION

[0043] The following technology can be used in 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 can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can 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 can 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 a 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.

[0044] 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. For background technology, the terms and abbreviations used in the present disclosure refer to technical specifications (e.g., 38.211, 38.212, 38.213, 38.214, 38.300, 38.331, etc.) published before the present disclosure.

[0045] 5G communication involving a new radio access technology (NR) system will be described below.

[0046] The three key requirement areas for 5G are (1) enhanced mobile broadband (eMBB), (2) massive machine-type communications (mMTC), and (3) ultra-reliable and low-latency communications (URLLC).

[0047] Some use cases may require optimization in multiple dimensions, while others may focus on just one key performance indicator (KPI). 5G supports this variety of use cases in a flexible and reliable manner.

[0048] eMBB goes far beyond basic mobile Internet access and covers rich interactive work, media and entertainment applications in the cloud or augmented reality (AR). Data is one of the key drivers of 5G, and in the 5G era, we may see no dedicated voice services for the first time. In 5G, it is expected that voice is simply processed as an application using the data connection provided by the communication system. The main driving force for the increased traffic is the increase in content size and the number of applications that require high data rates. As more devices are connected to the Internet, streaming services (audio and video), interactive video, and mobile Internet connections will continue to be more widely used. Many of these applications require always-on connections to push real-time information and notifications to users. For mobile communication platforms, cloud storage and applications are increasing rapidly. This applies to both work and entertainment. Cloud storage is a specific use case that drives the growth of uplink data rates. 5G will also be used for remote work in the cloud, which requires much lower end-to-end latency when done using a tactile interface in order to maintain a good user experience. Entertainment (e.g., cloud gaming and video streaming) is another key driver for increased demand for mobile broadband capacity. Entertainment is very important on smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes. Another use case is AR and information search for entertainment, which requires very low latency and large amounts of real-time data.

[0049] One of the most anticipated 5G use cases is the ability to actively connect embedded sensors in every field, i.e. mMTC. It is expected that there will be 20.4 billion potential Internet of Things (IoT) devices by 2020. In industrial IoT, 5G is one of the areas that will play a key role in enabling smart cities, asset tracking, smart utilities, agriculture, and secure infrastructure.

[0050] URLLC includes services that will transform industries utilizing ultra-reliable / available low-latency links, such as remote control of critical infrastructure and autonomous vehicles. Reliability and latency levels are critical for smart grid control, industrial automation, robotics, drone control and coordination, etc.

[0051] Now, multiple use cases in a 5G communication system including an NR system will be described in detail.

[0052] 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or cable data service interface specification (DOCSIS)) as a means of delivering streams at data rates ranging from hundreds of megabits per second to gigabits per second. Such high speeds are needed for television broadcasts with resolutions of 4K (6K, 8K, and higher) or higher, as well as virtual reality (VR) and AR. VR and AR applications mainly include immersive sports games. Specific applications may require special network configurations. For example, for VR games, gaming companies may have to integrate core servers with network operators' edge network servers in order to minimize latency.

[0053] The automotive industry is expected to become a very important new driver for 5G, where many use cases are used for mobile communications in vehicles. For example, the entertainment of passengers requires mobile broadband with both high capacity and high mobility, as future users will expect to continue their good quality connection independently of their location and speed. Other use cases in the automotive industry are AR dashboards. These displays overlay information on what the driver sees through the front window, identifying objects in the dark and telling the driver the distance and movement of objects. In the future, wireless modules will enable communication between the vehicles themselves, between the vehicle and the supporting infrastructure, and between the vehicle and other connected devices (e.g., those carried by pedestrians). Safety systems can guide drivers in alternative courses of action to allow them to drive more safely and reduce the risk of accidents. The next stage will be remote-controlled or autonomous vehicles. These require very reliable, very fast communication between different autonomous vehicles and between vehicles and infrastructure. In the future, autonomous vehicles will perform all driving activities, while the driver focuses on the elusive traffic anomalies in the vehicle itself. The technical needs of autonomous vehicles require ultra-low latency and ultra-high reliability, raising traffic safety to a level that people cannot achieve.

[0054] Smart cities and smart homes (often referred to as smart societies) will be embedded with dense wireless sensor networks. Distributed networks of smart sensors will identify conditions for cost and energy-saving maintenance in a city or home. A similar setup can be done for each home, where temperature sensors, window and heating controls, burglar alarms, and home appliances are all wirelessly connected. Many of these sensors are typically characterized by low data rates, low power, and low cost, but real-time high-definition (HD) video may be required for surveillance in certain types of equipment, for example.

[0055] The consumption and distribution of energy (including heat or gas) is becoming highly decentralized, creating a need for automatic control of very distributed sensor networks. Smart grids interconnect these sensors, using digital information and communication technologies to collect and act on information. This information can include information about the behavior of suppliers and consumers, allowing smart grids to improve the efficiency, reliability, economy and sustainability of the production and distribution of fuels such as electricity in an automated manner. Smart grids can be viewed as another sensor network with low latency.

[0056] The health sector has many applications that can benefit from mobile communications. Communication systems enable telemedicine that provides remote clinical health care. It helps eliminate distance barriers and can improve access to medical services that are not always available in remote rural communities. It is also used to save lives in critical care and emergency situations. Wireless sensor networks based on mobile communications can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0057] Wireless and mobile communications are becoming increasingly important for industrial applications. Wires are expensive to install and maintain, and the possibility of replacing them with reconfigurable wireless links is an attractive opportunity for many industries. However, achieving this requires wireless connections to work with similar latency, reliability, and capacity as cables, and to simplify their management. Low latency and very low probability of error are new requirements that need to be addressed with 5G.

[0058] Finally, logistics and freight tracking are important use cases for mobile communications, which enable tracking of inventory and packages anytime, anywhere by using location-based information systems. Logistics and freight tracking use cases typically require lower data rates but require wide coverage and reliable location information.

[0059] Figure 1 FIG. 4 shows an exemplary UL transmission operation of a UE. The UE may be based on DG( Figure 1 (a)) or based on CG( Figure 1 (b)) to send the expected packet.

[0060] For UL, the BS can dynamically allocate resources for UL transmission to the UE through (one or more) PDCCHs (including DCI format 0_0 or DCI format 0_1). In addition, the BS can allocate UL resources for initial HARQ transmission to the UE based on the configured grant (CG) method (similar to SPS). Although dynamic scheduling involves PDCCH for PUSCH transmission, the configured grant does not involve PDCCH for PUSCH transmission. However, UL resources for retransmission are explicitly allocated by (one or more) PDCCHs. In this way, the operation of the BS pre-configuring UL resources without a dynamic grant (DG) (for example, by scheduling a UL grant of DCI) is called "CG". Two types of CG are defined.

[0061] - Type 1: UL grant with a predetermined period is provided by higher layer signaling (without L1 signaling).

[0062] -Type 2: The period of UL grant is configured by higher layer signaling, and the activation / deactivation of CG is signaled by PDCCH to provide UL grant.

[0063] Resources for CG can be shared among multiple UEs. UL signal transmission based on CG from each UE can be identified by time / frequency resources and RS parameters (e.g., different cyclic shifts, etc.). Therefore, when a UE fails to send a UL signal due to a signal conflict, the BS can identify the UE and explicitly send a retransmission grant for the corresponding TB to the UE.

[0064] K repetition transmissions including initial transmission are supported for the same TB through CG. The same HARQ process ID is determined for the K-repetition UL signals based on the resources used for the initial transmission. The redundancy version (RV) of the K-repetition TB has one of the patterns {0,2,3,1}, {0,3,0,3} and {0,0,0,0}.

[0065] The UE performs repeated transmissions until one of the following conditions is met:

[0066] - Successfully received UL grant for the same TB;

[0067] -TB is repeated up to K times; and

[0068] - The end time of period P is reached.

[0069] Similar to Licensed Assisted Access (LAA) in the conventional 3GPP LTE system, unlicensed bands are also being considered for cellular communications in the 3GPP NR system. Unlike LAA, standalone (SA) operation is targeted in the NR cell in the unlicensed band (hereinafter referred to as NR unlicensed cell (Ucell)). For example, PUCCH, PUSCH, and PRACH transmissions can be supported in the NR Ucell.

[0070] On the LAA UL, with the introduction of an asynchronous HARQ process, there is no additional channel, such as a physical HARQ indicator channel (PHICH), for indicating HARQ-ACK information for PUSCH to the UE. Therefore, accurate HARQ-ACK information may not be used to adjust the contention window (CW) size in the UL LBT process. In the UL LBT process, when a UL grant is received in the nth subframe, the first subframe of the most recent UL transmission burst before the (n-3)th subframe has been configured as a reference subframe, and the CW size has been adjusted based on the new data indicator (NDI) for the HARQ process ID corresponding to the reference subframe. That is, when the BS switches the NDI or indicates retransmission of one or more transport blocks (TBs) according to one or more TBs, a method has been introduced: assuming that the transmission of the PUSCH fails in the reference subframe due to a conflict with other signals, the CW size is increased to the next maximum CW size of the currently applied CW size in a set of pre-agreed CW sizes, or the CW size is initialized to the minimum value (e.g., CWmin) assuming that the PUSCH in the reference subframe has been successfully sent without a conflict with other signals.

[0071] In the NR system to which various embodiments of the present disclosure are applicable, each component carrier (CC) may be allocated / supported up to 400 MHz. When a UE operating in such a wideband CC always operates with a radio frequency (RF) module turned on throughout the CC, the battery consumption of the UE may increase.

[0072] Alternatively, considering various use cases (e.g., eMBB, URLLC, mMTC, etc.) operating within a single wideband CC, different parameter sets (e.g., SCS) may be supported for each frequency band within the CC.

[0073] Alternatively, each UE may have a different maximum bandwidth capability.

[0074] In this regard, the BS may indicate to the UE to operate only in a partial bandwidth of the wideband CC instead of the full bandwidth. The partial bandwidth may be defined as a bandwidth part (BWP).

[0075] A BWP may be a subset of continuous RBs on the frequency axis. One BWP may correspond to one parameter set (eg, SCS, CP length, slot / mini-slot duration, etc.).

[0076] Figure 2 An exemplary wireless communication system supporting unlicensed bands suitable for use with the present disclosure is illustrated.

[0077] In the following description, a cell operating in an authorized band (L-band) is defined as an L cell, and a carrier of the L cell is defined as a (DL / UL) LCC. A cell operating in an unlicensed band (U band) is defined as a U cell, and a carrier of the U cell is defined as a (DL / UL) UCC. A carrier / carrier frequency of a cell may refer to an operating frequency (e.g., a center frequency) of the cell. A cell / carrier (e.g., CC) is generally referred to as a cell.

[0078] When the BS and UE send and receive signals on the LCC and UCC of carrier aggregation, such as Figure 2 As shown in (a), the LCC and UCC can be configured as a primary CC (PCC) and a secondary CC (SCC), respectively. The BS and the UE can send and receive signals on one UCC or on multiple carrier aggregation UCCs, such as Figure 2 (b) In other words, the BS and UE can send and receive signals only on (one or more) UCCs without using any LCC. For SA operation, PRACH, PUCCH, PUSCH and SRS transmission can be supported on UCell.

[0079] Signal transmission and reception operations in the unlicensed band as described in the present disclosure may be applied to the above-mentioned deployment scenarios (unless otherwise stated).

[0080] Unless otherwise stated, the following definitions apply to the following terms used in this disclosure.

[0081] - Channel: A carrier or a part of a carrier consisting of a set of consecutive RBs, where a channel access procedure (CAP) is performed in the shared spectrum.

[0082] - Channel Access Procedure (CAP): A procedure to evaluate channel availability based on sensing before signal transmission in order to determine whether (one or more) other communication nodes are using the channel. The basic sensing unit is a duration of T sl = 9us sensing time slot. The BS or UE senses the time slot during the sensing time slot duration. When the power detected in at least 4us within the sensing time slot duration is less than the energy detection threshold X thresh The sensing time slot duration is T sl is considered idle. Otherwise, the sensing time slot duration T slConsidered busy. CAP can also be called Listen Before Talk (LBT).

[0083] - Channel occupancy: Transmission(s) on the channel(s) from the BS / UE after the CAP.

[0084] - Channel Occupancy Time (COT): The total time that a BS / UE and any (one or more) BS / UEs sharing the channel occupancy perform (one or more) transmissions on the channel after the CAP. Regarding COT determination, if a transmission gap is less than or equal to 25us, the gap duration can be counted in the COT.

[0085] The COT may be shared for transmission between the BS and corresponding UE(s).

[0086] Specifically, sharing the UE-initiated COT with the BS may refer to an operation in which the UE assigns to the BS a portion of a channel occupied by LBT based on a random backoff counter (e.g., Category 3 (Cat-3) LBT or Category 4 (Cat-4) LBT), and when LBT is performed without a random backoff counter (e.g., Category 1 (Cat-1) LBT or Category 2 (Cat-2) LBT) using a timing gap occurring before DL transmission starting from the UE's UL transmission end timing, after successfully confirming that the channel is idle through LBT, the BS performs DL transmission using the remaining COT of the UE.

[0087] Meanwhile, sharing the gNB-initiated COT with the UE may refer to an operation in which the BS assigns a portion of a channel occupied by LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) to the UE, and when, after performing LBT (e.g., Cat-1 LBT or Cat-2 LBT) without a random backoff counter using a timing gap occurring before UL transmission starting from the DL transmission end timing of the BS, the UE performs UL transmission using the remaining COT of the BS when the channel is idle after successful confirmation through LBT.

[0088] -DL transmission burst: A set of transmissions from a BS without any gaps greater than 16us. Transmissions from a BS separated by gaps greater than 16us are considered separate DL transmission bursts. The BS may perform (one or more) transmissions after a gap without sensing channel availability within a DL transmission burst.

[0089] -UL transmission burst: A set of transmissions from a UE without any gaps greater than 16us. Transmissions from a UE separated by gaps greater than 16us are considered separate UL transmission bursts. The UE may perform transmission(s) after a gap without sensing channel availability within a DL transmission burst.

[0090] -Discovery burst: A DL transmission burst including a set of (one or more) signals and / or (one or more) channels confined within a window and associated with a duty cycle. The discovery burst may include (one or more) transmissions initiated by the BS, including PSS, SSS, and cell-specific RS (CRS), and further including non-zero power CSI-RS. In an NR system, the discovery burst may include (one or more) transmissions initiated by the BS, which include at least SS / PBCH blocks and further include a CORESET of a PDCCH for scheduling a PDSCH carrying SIB1, a PDSCH carrying SIB1, and / or a non-zero power CSI-RS.

[0091] Figure 3 An exemplary method of occupying resources in an unlicensed band is illustrated.

[0092] refer to Figure 3 , a communication node (e.g., BS or UE) operating in an unlicensed band should determine whether (one or more) other communication nodes are using a channel before signal transmission. For this purpose, the communication node may perform CAP to access (one or more) channels on which (one or more) transmissions are to be performed in the unlicensed band. CAP may be performed based on sensing. For example, a communication node may determine whether (one or more) other communication nodes are transmitting signals on (one or more) channels by carrier sensing (CS) before signal transmission. Determining that (one or more) other communication nodes are not transmitting signals is defined as confirming a clear channel assessment (CCA). In the presence of a CCA threshold (e.g., X) that has been predefined or configured by higher layer (e.g., RRC) signaling, the communication node may perform CAP to access (one or more) channels on which (one or more) transmissions are to be performed ... thresh ), when energy above the CCA threshold is detected in the channel, the communication node may determine that the channel is busy. Otherwise, the communication node may determine that the channel is idle. When the channel is determined to be idle, the communication node may start sending signals in the unlicensed band. CAP may be replaced by LBT.

[0093] Table 1 describes exemplary CAPs supported in NR-U.

[0094] [Table 1]

[0095]

[0096] In a wireless communication system supporting an unlicensed band, a cell (or carrier (e.g., CC)) or BWP configured for a UE may be a broadband with a larger bandwidth (BW) than conventional LTE. However, the BW of a CCA requiring independent LBT operation may be limited according to regulations. A subband (SB) in which LBT is performed separately is defined as an LBT-SB. Then, multiple LBT-SBs may be included in one broadband cell / BWP. The RB set included in the LBT-SB may be configured through higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, one or more LBT-SBs may be included in one cell / BWP. Multiple LBT-SBs may be included in the BWP of a cell (or carrier). The LBT-SB may be, for example, a 20-MHz frequency band. The LBT-SB may include multiple consecutive (P)RBs in the frequency domain, and may therefore be referred to as a (P)RB set.

[0097] The UE performs a Type 1 or Type 2 CAP for UL signal transmission in the unlicensed band. Typically, the UE may perform a CAP (e.g., Type 1 or Type 2) configured by the BS for UL signal transmission. For example, the CAP type indication information may be included in a UL grant (e.g., DCI format 0_0 or DCI format 0_1) that schedules PUSCH transmission.

[0098] In a Type 1 UL CAP, the length of the time period spanned by the sensing slots sensed as idle prior to the transmission(s) is random. The Type 1 UL CAP may be applied to the following transmissions.

[0099] - PUSCH / SRS transmission(s) scheduled and / or configured by the BS

[0100] - PUCCH transmission(s) scheduled and / or configured by the BS

[0101] - Transmission(s) associated with the Random Access Procedure (RAP)

[0102] Figure 4 A Type 1 CAP in a channel access procedure of a UE for UL / DL signal transmission in a U-band applicable to the present disclosure is illustrated.

[0103] First, refer to Figure 4 Describe UL signal transmission in the U-band.

[0104] The UE may delay for a duration T d, senses whether the channel is idle during the sensing time slot duration in . After the counter N is decremented to 0, the UE may perform transmission (S434). According to the following process, the counter N is adjusted by sensing the channel during (one or more) additional time slot durations.

[0105] Step 1) Set N = N init , where N init is evenly distributed between 0 and CW P and go to step 4 (S420).

[0106] Step 2) If N>0 and the UE chooses to decrement the counter, N=N-1 is set (S440).

[0107] Step 3) Sense the channel during the additional time slot duration, and if the additional time slot duration is idle (Y), go to step 4. Otherwise (N), go to step 5 (S450).

[0108] Step 4) If N=0 (Y) (S430), stop CAP (S432). Otherwise (N), go to step 2.

[0109] Step 5) Sense the channel until the additional delay duration T d A busy sensing time slot is detected within 1 second or an additional delay duration T is added d All time slots of are sensed as idle (S460).

[0110] Step 6) If the additional delay duration T d If the channel is sensed to be idle during all time slot durations (Y), go to step 4. Otherwise (N), go to step 5 (S470).

[0111] Table 2 illustrates the m applied to CAP P , minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW size vary according to the channel access priority level.

[0112] [Table 2]

[0113]

[0114] Delay duration T d Including followed by m p The duration of consecutive time slots is T f (16us), where each time slot lasts T sl is 9us, and T f The sensing time slot duration T is included at the beginning of the 16-us duration sl .CW Wmin,p<=CW p <=CW max,p .CW p Set to CW min,p , and may be updated (CW size update) based on an explicit / implicit reception response to a previous UL burst (e.g., PUSCH) before step 1. p Can be initialized to CW based on explicit / implicit reception response to previous UL burst min,p , may be increased to the next higher allowed value, or may be maintained at the existing value.

[0115] In a Type 2 UL CAP, the length of the time period spanned by the sensing slots sensed as idle before (one or more) transmissions is deterministic. Type 2 UL CAPs are classified into Type 2A UL CAPs, Type 2B UL CAPs, and Type 2C UL CAPs. In a Type 2A UL CAP, the UE may select a sensing slot that is idle for at least the sensing duration T. short_dl The signal is sent immediately after the channel is sensed as idle during (=25us). short_DL It includes the duration Tf (=16us) and the duration of a subsequent sensing slot. In Type 2A UL CAP, T f In a Type 2B UL CAP, the UE may select a sensing slot at the beginning of the sensing slot duration T. f The signal is sent immediately after the channel is sensed as idle during (=16us). In Type 2B UL CAP, T f The sensing slots within the last 9us of the duration are included. In Type 2C UL CAP, the UE does not sense the channel before transmission.

[0116] In order to allow the UE to send UL data in the unlicensed band, the BS should succeed in the LBT operation to send the UL grant in the unlicensed band, and the UE should also succeed in the LBT operation to send the UL data. That is, the UE can attempt UL data transmission only when both the BS and the UE are successful in their LBT operations. In addition, because a delay of at least 4 milliseconds is involved between the UL grant and the scheduled UL data in the LTE system, an earlier access from another transmission node coexisting in the unlicensed band during this period can postpone the scheduled UL data transmission of the UE. In this context, a method of improving the efficiency of UL data transmission in the unlicensed band is being discussed.

[0117] In order to support UL transmission with relatively high reliability and relatively low time delay, NR also supports CG type 1 and CG type 2, in which the BS pre-configures time, frequency and coding resources for the UE through higher layer signaling (e.g., RRC signaling) or both higher layer signaling and L1 signaling (e.g., DCI). In the absence of receiving a UL grant from the BS, the UE can perform UL transmission in resources configured with type 1 or type 2. In type 1, the periodicity of the CG, the offset from SFN=0, the time / frequency resource allocation, the number of repetitions, the DMRS parameters, the MCS / TB size (TBS), the power control parameters, etc. are all configured only by higher layer signaling such as RRC signaling, without L1 signaling. Type 2 is a scheme in which the periodicity and power control parameters of the CG are configured by higher layer signaling such as RRC signaling, and information about the remaining resources (e.g., the offset of the initial transmission timing, the time / frequency resource allocation, the DMRS parameters and the MCS / TBS) are indicated by activating DCI as L1 signaling.

[0118] The biggest difference between the autonomous uplink (AUL) of LTE LAA and the CG of NR is the HARQ-ACK feedback transmission method for the PUSCH transmitted by the UE without receiving a UL grant and the presence or absence of UCI transmitted with the PUSCH. Although the HARQ process is determined by the equation of the symbol index, symbol period, and number of HARQ processes in the CG of NR, explicit HARQ-ACK feedback information is transmitted in the AUL downlink feedback information (AUL-DFI) in LTE LAA. In addition, in LTE LAA, whenever AUL PUSCH transmission is performed, UCI including information such as HARQ ID, NDI, and RV is also transmitted in the AUL UCI. In the case of NR's CG, the BS identifies the UE by the time / frequency resources and DMRS resources used for PUSCH transmission, while in the case of LTE LAA, the BS identifies the UE by the UE ID explicitly included in the AULUCI transmitted together with the PUSCH as well as the DMRS resources.

[0119] Now, refer to Figure 4 Describe DL signal transmission in U-band.

[0120] The BS may perform one of the following U-band access procedures (eg, channel access procedure (CAP)) to transmit a DL signal in the U-band.

[0121] (1) Type 1 DL CAP method

[0122] In a Type 1 DL CAP, the length of the duration spanned by the sensing slots sensed as idle prior to the transmission(s) is random. Type 1 DL CAP may be applied to the following transmissions:

[0123] - a transmission(s) initiated by the BS comprising (i) a unicast PDSCH with user plane data, or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data; or

[0124] - Transmission(s) initiated by the BS, comprising (i) only a discovery burst, or (ii) a discovery burst multiplexed with non-unicast information.

[0125] refer to Figure 4 , the BS may first sense whether the channel is idle during the sensing time slot duration of the postponement duration Td. Next, if the counter N is decremented to 0, the transmission may be performed (S434). According to the following process, the counter N is adjusted by sensing the channel during (one or more) additional time slot durations.

[0126] Step 1) Set N=Ninit, where Ninit is a random number uniformly distributed between 0 and CWp, and go to step 4 (S420).

[0127] Step 2) If N>0 and the BS chooses to decrement the counter, it sets N=N-1 (S440).

[0128] Step 3) Sense the channel during the additional time slot duration, and if the additional time slot duration is idle (Y), go to step 4. Otherwise (N), go to step 5 (S450).

[0129] Step 4) If N=0 (Y), stop CAP (S1232). Otherwise (N), go to step 2 (S430).

[0130] Step 5) The channel is sensed until a busy sensing time slot is detected within the additional deferral duration Td or all time slots of the additional deferral duration Td are sensed as idle (S460).

[0131] Step 6) If the channel is sensed to be idle during all time slots of the additional deferral duration Td (Y), go to step 4. Otherwise (N), go to step 5 (S470).

[0132] Table 3 illustrates that mp, minimum CW, maximum CW, MCOT, and allowed CW size applied to CAP vary according to channel access priority level.

[0133] [Table 3]

[0134]

[0135] The deferral duration Td includes a duration Tf (16 μs) followed by mp consecutive sensing time slot durations, wherein each sensing time slot duration Tsl is 9 μs, and Tf includes the sensing time slot duration Tsl at the start of the 16 μs duration.

[0136] CWmin,p<=CWp<=CWmax,p. CWp is set to CWmin,p and may be updated (CW size update) based on HARQ-ACK feedback (e.g., a ratio of ACK signals or NACK signals) for a previous DL burst (e.g., PDSCH) before step 1. For example, CWp may be initialized to CWmin,p based on HARQ-ACK feedback for a previous DL burst, may be increased to the next highest allowed value, or may be maintained at an existing value.

[0137] (2) Type 2DL CAP method

[0138] In a Type 2 DL CAP, the length of the duration spanned by the time slots sensed as idle prior to transmission(s) is sensed deterministically. Type 2 DL CAPs are classified into Type 2A DL CAPs, Type 2B DL ​​CAPs, and Type 2C DL CAPs.

[0139] Type 2A DL CAP can be applied to the following transmission. In Type 2A DL CAP, the BS can send a signal immediately after sensing that the channel is idle during at least the sensing duration Tshort_dl=25μs. Tshort_dl includes the duration Tf (=16μs) and a following sensing slot duration. Tf includes the sensing slot at the beginning of the duration.

[0140] - a transmission(s) initiated by the BS, comprising (i) only a discovery burst, or (ii) a discovery burst multiplexed with non-unicast information, or

[0141] - The BS's transmission(s) that is 25 μs later than the UE's transmission(s) within the shared channel occupancy.

[0142] Type 2B DL ​​CAP applies to (one or more) transmissions performed by the BS within the shared channel occupancy and after 16μs from the UE's (one or more) transmission gap. In Type 2B DL ​​CAP, the BS can send a signal immediately after sensing that the channel is idle during Tf=16μs. Tf includes the sensing timeslot within the last 9μs of the duration. Type 2C DL CAP applies to (one or more) transmissions performed by the BS within the shared channel occupancy and after 16μs from the UE's (one or more) transmission maximum gap. In Type 2C DL CAP, the BS does not sense the channel before performing a transmission.

[0143] In a wireless communication system supporting U-band, one cell (or carrier (e.g., CC)) or BWP configured for a UE may consist of a broadband with a larger BW than in conventional LTE. However, according to regulations, the BW requiring CCA based on independent LBT operation may be restricted. If a subband (SB) in which LBT is performed separately is defined as an LBT-SB, multiple LBT-SBs may be included in one broadband cell / BWP. The set of RBs constituting the LBT-SB may be configured through higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, one or more LBT-SBs may be included in one cell / BWP.

[0144] Figure 5 The diagram shows that a plurality of LBT-SBs are included in the U-band.

[0145] refer to Figure 5 , multiple LBT-SBs may be included in the BWP of a cell (or carrier). The LBT-SB may be, for example, a 20-MHz frequency band. The LBT-SB may include multiple consecutive (P)RBs in the frequency domain, and may therefore be referred to as a (P)RB set. Although not shown, a guard band (GB) may be included between the LBT-SBs. Therefore, the BWP can be configured in the form of {LBT-SB#0 (RB set #0)+GB#0+LBT-SB#1 (RB set #1+GB#1)+...+LBT-SB#(k-1) (RB set (#k-1))}. For convenience, the LBT-SB / RB index may be configured / defined to increase as the frequency band becomes higher starting from the low frequency band.

[0146] In the NR system, a large-scale multiple-input multiple-output (MIMO) environment in which the number of transmission / reception (Tx / Rx) antennas is significantly increased can be considered. That is, when considering a large-scale MIMO environment, the number of Tx / Rx antennas can be increased to tens or hundreds. The NR system supports communications in frequency bands above 6 GHz (i.e., millimeter bands). However, the millimeter band is characterized by a frequency characteristic in which the signal decays very quickly according to the distance due to the use of too high a frequency band. Therefore, in an NR system operating at 6 GHz or above, beamforming (BF) is considered, in which a signal is sent in a specific direction rather than omnidirectionally with concentrated energy to compensate for rapid propagation attenuation. Therefore, for the purpose of improving performance, flexible resource allocation, and ease of frequency beam control in a large-scale MIMO environment, a hybrid BF with a combination of analog BF and digital BF according to the position of the applied BF weight vector / precoding vector is required.

[0147] Figure 6 is a block diagram illustrating an exemplary transmitter and receiver for hybrid BF.

[0148] In order to form a narrow beam in the millimeter frequency band, the BF method is mainly considered, in which the BS or UE sends the same signal through multiple antennas by applying an appropriate phase difference to the antenna and thus increasing energy only in a specific direction. This BF method includes a digital BF for generating a phase difference for a digital baseband signal, an analog BF for generating a phase difference by using a time delay (ie, a cyclic shift) to modulate an analog signal, and a hybrid BF with a combined digital BF and analog beamforming. Using a radio frequency (RF) unit (or transceiver unit (TXRU)) for antenna elements to control transmission power and phase control based on antenna elements enables independent BF to be implemented for each frequency resource. However, installing TXRU in all approximately 100 antenna elements is not feasible in terms of cost. That is, a large number of antennas are required to compensate for the rapid propagation attenuation in millimeter frequencies, and digital BF requires as many RF components (e.g., digital-to-analog converters (DACs), mixers, power amplifiers, and linear amplifiers) as the number of antennas. Therefore, implementing digital BF in millimeter frequency bands increases the price of communication equipment. Therefore, when a large number of antennas are required, as in the case of millimeter frequency bands, consider analog BF or hybrid BF. In analog BF, multiple antenna elements are mapped to a single TXRU and the beam direction is controlled by analog phase shifters. Because only one beam direction is generated over the entire frequency band in analog BF, frequency selective BF may not be achieved using analog BF. Hybrid BF is an intermediate form between digital BF and analog BF, using B RF units with less than Q antenna elements. In hybrid BF, the number of beam directions available for simultaneous transmission is limited to B or less, depending on how the B RF units and Q antenna elements are connected.

[0149] Beam Management (BM)

[0150] BM refers to a series of processes for acquiring and maintaining a set of BS beams (transmission and reception point (TRP) beams) and / or a set of UE beams that can be used for DL ​​and UL transmission / reception. BM may include the following processes and terms.

[0151] - Beamforming: An operation where a BS or UE measures the characteristics of a received beamforming signal

[0152] -Beam determination: The operation by which the BS or UE selects its Tx / Rx beam

[0153] -Beam scanning: Operation that covers the spatial domain by using Tx and / or Rx beams at prescribed time intervals according to a predetermined method

[0154] - Beam reporting: Operation of UE to report information about beamformed signals based on beam measurements

[0155] The BM process may be divided into (1) a DL BM process using SSB or CSI-RS and (2) a UL BM process using SRS. In addition, each BM process may include Tx beam scanning for determining a Tx beam and Rx beam scanning for determining an Rx beam.

[0156] The DL BM process may include (1) transmission of a beamformed DL RS (eg, CSI-RS or SSB) from a BS and (2) beam reporting from a UE.

[0157] The beam report may include (one or more) preferred DL RS IDs and (one or more) reference signal received powers (RSRPs) corresponding to (one or more) preferred DL RS IDs. The DL RS ID may be a SSB resource indicator (SSBRI) or a CSI-RS resource indicator (CRI).

[0158] 2.DL BM related beam indication

[0159] The UE may receive a list of at least up to M candidate transmission configuration indication (TCI) states for QCL indication via RRC signaling. M depends on the UE capability and may be 64.

[0160] Each TCI state may be configured with one RS set. Table 4 describes an example of TC-State IE. TC-State IE is related to the QCL type corresponding to one or two DL RSs.

[0161] [Table 4]

[0162]

[0163]

[0164] In Table 4, "bwp-Id" identifies the DL BWP where the RS is located, "cell" indicates the carrier where the RS is located, and "referencesignal" indicates the reference antenna port(s) used as the QCL source for the target antenna port(s) or the RS including the reference antenna port(s). The target antenna port(s) may be used for CSI-RS, PDCCH DMRS, or PDSCH DMRS.

[0165] 3. Quasi-co-sited (QCL)

[0166] A UE may receive a list of up to M TCI state configurations to decode the PDSCH based on a detected PDCCH carrying DCI intended for a given cell. M depends on the UE capabilities.

[0167] Each TCI-State includes parameters for establishing a QCL relationship between one or more DL RSs and PDSCH DM-RS ports as described in Table 4. The QCL relationship is established using RRC parameters qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS (if configured).

[0168] The QCL type of each DL RS is given by a parameter 'qcl-Type' included in QCL-Info and may have one of the following values.

[0169] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0170] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0171] - 'QCL-TypeC': {Doppler shift, average delay}

[0172] - 'QCL-TypeD': {spatial Rx parameters}

[0173] For example, if the target antenna port is for a specific NZP CSI-RS, the NZP CSI-RS antenna port may be indicated / configured to be QCL with a specific TRS from the perspective of QCL-Type A, and to be QCL with a specific SSB from the perspective of QCL-Type D. Upon receiving this indication / configuration, the UE may receive the NZP CSI-RS using the Doppler value and delay value measured in the QCL-TypeA TRS, and apply the Rx beam for receiving the QCL-TypeD SSB to receive the NZP CSI-RS.

[0174] UL BM process

[0175] In the UL BM, beam reciprocity (or beam correspondence) between Tx and Rx beams may or may not be established according to the implementation of the UE. If Tx-Rx beam reciprocity is established at both the BS and the UE, the UL beam pair can be obtained from the DL beam pair. However, if Tx-Rx beam reciprocity is not established at either the BS or the UE, a process for determining the UL beam is required separately from the determination of the DL beam pair.

[0176] In addition, even when both the BS and the UE maintain beam correspondence, the BS may apply the UL BM procedure to determine the DLTx beam without requesting the UE to report its preferred beam.

[0177] UL BM may be performed based on beamformed UL SRS transmission. Whether UL BM is performed on an SRS resource set may be determined by a usage parameter (RRC parameter). If the usage is determined to be BM, only one SRS resource may be sent for each of a plurality of SRS resource sets at a given time.

[0178] The UE may be configured with one or more SRS resource sets (via RRC signaling), where the one or more SRS resource sets are configured by SRS-ResourceSet (RRC parameter). For each SRS resource set, the UE may be configured with K ≥ 1 SRS resources, where K is a natural number and the maximum value of K is indicated by SRS_capability.

[0179] Similar to the DL BM, the UL BM process can also be divided into Tx beam scanning at the UE and Rx beam scanning at the BS.

[0180] In the proposed method described later, a beam may refer to an area for performing a specific operation (e.g., LBT or transmission) by concentrating power in a specific direction and / or a specific space. In other words, the UE or BS can perform operations such as LBT or transmission by targeting a specific area (i.e., beam) corresponding to a specific space and / or a specific direction. Therefore, each beam may correspond to each space and / or each direction. In addition, the UE or BS may use a spatial domain filter corresponding to each space and / or each direction in order to use each beam. That is, one spatial domain filter may correspond to one or more beams. The UE or BS may perform operations such as LBT or transmission using a spatial domain filter corresponding to the beam (or space and / or direction) to be used.

[0181] For example, the UE or BS may perform LBT using a spatial domain filter corresponding to an LBT beam in a space and / or direction for a corresponding LBT beam, or may perform DL / UL transmission using a spatial domain filter corresponding to a Tx beam in a space and / or direction for a corresponding Tx beam.

[0182] Hereinafter, the present disclosure proposes an efficient LBT method based on a multi-channel access process applied to independent per-beam LBT for transmission in multiple beam directions by extending to the spatial domain. The present disclosure also proposes a method for differently configuring an energy detection (ED) threshold according to whether the type of DL / UL transmission is broadcast transmission or unicast transmission and a method for sharing COT for each transmission type.

[0183] A typical CAP performed for transmission in the U band is LBT. LBT is a mechanism to prevent collisions between transmissions by allowing transmission of corresponding signals when the noise level as a result of comparing the surrounding interference level measured by the BS and / or UE to transmit the signal with a specific threshold (such as an ED threshold) is less than a certain level.

[0184] Figure 7 An exemplary D-LBT and an exemplary O-LBT are illustrated.

[0185] Figure 7 (a) illustrates a D-LBT including a specific beam direction LBT and / or a beam group unit LBT, and Figure 7 (b) Schematic representation of O-LBT.

[0186] In a conventional NR-U system (e.g., Rel-16 NR-U), if Figure 7As described above, if the channel is determined to be idle by performing CAP (i.e., LBT), the DL / UL signal / channel has been transmitted. On the other hand, in the conventional NR-U system, the LBT band has been aligned with the LBT band of other RATs to coexist with other RATs (e.g., Wi-Fi), and CAP (i.e., LBT) has been performed omnidirectionally. In other words, non-directional LBT has been performed in the conventional NR-U system.

[0187] However, Rel-17 NR-U for transmitting DL / UL signals / channels in a higher band (e.g., a band of 52.6 GHz or higher) than the U-band of 7 GHz used in the conventional NR-U system can utilize directional LBT (D-LBT), which transmits signals / channels by concentrating energy in a specific beam direction to overcome a larger path loss than in the 7 GHz band used in the conventional system. That is, in Rel-17 NR-U, path loss can be reduced by D-LBT, DL / UL signals / channels can be transmitted over a wider coverage area, and efficiency can be improved even when coexisting with other RATs (e.g., WiGig).

[0188] refer to Figure 7 (a), when a beam group consists of beams #1 to #5, performing LBT based on beams #1 to #5 can be referred to as beam group unit LBT. In addition, performing LBT by any one of beams #1 to #5 (e.g., beam #3) can be referred to as specific beam direction LBT. In this case, beams #1 to #5 can be continuous (or adjacent) beams, but can also be discontinuous (or non-adjacent) beams. In addition, the number of beams included in a beam group is not necessarily multiple, and a single beam can form a beam group.

[0189] Meanwhile, although LBT per beam may be performed, LBT per beam group may also be performed. For example, if LBT per beam is performed, beams #1 to #5 may cover a plurality of Tx beams multiplexed by time division multiplexing (TDM) and / or space division multiplexing (SDM), respectively. For example, beam #1 may cover Tx beam #1 among a plurality of Tx beams multiplexed by TDM and / or SDM, beam #2 may cover Tx beam #2 among a plurality of Tx beams, beam #3 may cover Tx beam #3 among a plurality of Tx beams, beam #4 may cover Tx beam #4 among a plurality of Tx beams, and beam #5 may cover Tx beam #5 among a plurality of Tx beams. Here, coverage may mean that the area of ​​the beam used to perform LBT includes an area on which the Tx beam corresponding to the corresponding beam has an effective influence (or interference) or is at least the same as the area.

[0190] In other words, coverage may refer to performing energy measurement through a sensing beam for performing LBT, which sensing beam includes an area affected by interference from a Tx beam. In addition, channel idle / busy may be determined by comparing the energy measured through the sensing beam with an ED threshold.

[0191] As another example, performing LBT per beam group may refer to simultaneously performing LBT in units of beam groups for a plurality of Tx beams multiplexed by TDM and / or SDM corresponding to the beams included in the beam group. In other words, one beam for the beam group (hereinafter, a group LBT beam) may be formed, and LBT may be simultaneously performed for all Tx beams in the plurality of Tx beams using the group LBT beam.

[0192] Accordingly, the group LBT beam may cover all Tx beams corresponding to the beam group (e.g., Tx beam #1 to Tx beam #5). For example, the area of ​​the group LBT beam may include all areas on which each of the Tx beams (e.g., Tx beam #1 to Tx beam #5) has an effective influence (or interference) or at least be the same as all of the areas.

[0193] Figure 7 (b) illustrates O-LBT. When omnidirectional beams constitute one beam group and LBT is performed in units of the corresponding beam group, this can be interpreted as performing omnidirectional LBT (O-LBT). In other words, if beams in all directions (i.e., omnidirectional beams as a beam set covering a specific sector in a cell) are included in one beam group, this can mean O-LBT.

[0194] In other words, in the case of high frequency bands, the coverage may be limited due to significant path loss. To overcome this coverage problem, multi-antenna technology may be used. For example, narrow beam transmission that transmits a signal by concentrating energy in a specific direction may be performed instead of omnidirectional transmission.

[0195] In the high-frequency U-band, together with CAP such as the above-mentioned LBT, it is necessary to consider beam-based transmission combined therewith. For example, in order to perform D-LBT in a specific direction, D-LBT can be performed only in the corresponding direction, or LBT can be performed in units of beam groups including beams in the corresponding direction. Then, if the channel is determined to be idle, transmission can be performed. Here, the beam group can include a single beam or multiple beams. If the beam group includes an omnidirectional beam, D-LBT can be extended to O-LBT.

[0196] For transmission in multiple beam directions in the high frequency U-band, it may be necessary to perform D-LBT or O-LBT (e.g., Cat-3 LBT or Cat-4 LBT) based on LBT based on a random backoff counter, which covers all multiple beam directions in which transmission is to be performed. In this case, when performing independent LBT per beam including multiple narrow beams, LBT can be performed sequentially in each beam direction. However, in the above method, since the time required to perform LBT in all beam directions is increased, it may take a relatively long time to access the channel to start transmission compared to O-LBT.

[0197] Therefore, a representative beam direction can be determined among multiple narrow beam directions in which LBT is to be performed by extending the multi-channel access process of Rel-16 NR-U to the spatial domain. Then, LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) can be performed only in the determined representative beam direction, and LBT (e.g., Cat-2 LBT) other than LBT based on a random backoff counter can be performed in the remaining beam directions immediately before transmission. Transmission can start when LBT is successful, thereby reducing the delay time required until the start of transmission.

[0198] Meanwhile, the ED threshold (which is a criterion for determining whether a channel is idle or busy when performing LBT) may be configured differently depending on whether the transmission is a broadcast transmission after a wide beam LBT (e.g., a beam group LBT or O-LBT) or a unicast transmission in a specific beam direction after a narrow beam LBT (D-LBT). For example, the ED threshold for beam scanning and broadcast transmissions (such as transmissions of a synchronization signal block (SSB) or a beam management sounding reference signal (SRS)) may be set to a high ED threshold relative to the ED threshold for unicast transmissions (such as transmissions of a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH)) performed only in a specific direction after a narrow LBT. From the perspective of COT sharing, it may be desirable not to allow COT sharing for broadcast transmissions after a wide beam LBT, and it may be desirable to allow COT sharing only for unicast transmissions after a narrow beam LBT.

[0199] In addition, when downlink (DL) / uplink (UL) transmission is desired to be performed in a specific beam direction, the LBT method to be used between wide beam LBT and narrow beam LBT can be determined by the UE's capability or based on whether COT sharing is used (allowed).

[0200] Before describing the proposed method, the NR-based channel access scheme for unlicensed band used in the present disclosure is classified as follows.

[0201] - Category 1 (CAT-1): After a switching gap within the COT, the next transmission follows the previous transmission immediately, and the switching gap is shorter than 16us, even including the transceiver turnaround time. Cat-1 LBT can correspond to the above-mentioned Type 2C CAP.

[0202] - Category 2 (Cat-2): LBT method without backoff. Once the channel is confirmed to be idle during a specific time period shortly before transmission, the transmission can be performed immediately. Cat-2 LBT can be subdivided according to the length of the minimum sensing duration required for channel sensing immediately before transmission. For example, Cat-2 LBT with a minimum sensing duration of 25us may correspond to the above-mentioned Type 2A CAP, and Cat-2 LBT with a minimum sensing duration of 16us may correspond to the above-mentioned Type 2B CAP. The minimum sensing duration is merely exemplary, and a minimum sensing duration less than 25us or 16us (e.g., a minimum sensing duration of 9us) is also available.

[0203] - Category 3 (Cat-3): LBT method with backoff based on a fixed contention window size (CWS) i. The transmitting entity selects a random number N in the range of 0 to the (fixed) maximum CWS value and decrements the counter value each time the channel is determined to be idle. When the counter value reaches 0, the transmitting entity is allowed to perform transmission.

[0204] - Category 4 (Cat-4): LBT method with variable CWS-based backoff. The transmitting entity selects a random number N in the range of 0 to the (variable) maximum CWS value, and decrements the counter value each time the channel is determined to be idle. When the counter value reaches 0, the transmitting entity is allowed to perform the transmission. If the transmitting entity receives feedback indicating a reception failure of the transmission, the transmitting entity will increase the maximum CWS value by one level, select a random number again within the increased CWS value, and perform the LBT process. Cat-4 LBT can correspond to the above-mentioned Type 1 CAP.

[0205] As described above, in the high frequency U-band of 52 GHz or higher, in addition to O-LBT, the BS or UE can perform specific beam direction LBT or beam group LBT (D-LBT) as a channel access process, so that DL or UL signals / channels can be sent.

[0206] Unlike the COT obtained by performing LBT in all directions, in the COT obtained by performing LBT in a specific direction, it is desirable to allow transmission after Cat-2 LBT only for DL ​​transmission and UL transmission having a correlation (e.g., QCL relationship) with the beam direction in which LBT has been performed, and it is desirable to allow transmission after random backoff counter-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) for other signals / channels. However, depending on the gap length between DL transmission and UL transmission, transmission after Cat-1 LBT may be allowed instead of transmission after Cat-2 LBT.

[0207] LBT not based on a random backoff counter (e.g., Cat-2 LBT or Cat-1 LBT) to be performed by a BS or UE sharing a COT in a COT may be performed in all directions or in a beam direction that has a QCL relationship with the beam direction already used to obtain the COT. In addition, upon receiving a DL signal / channel of a specific beam direction or beam group direction, the UE may be configured to monitor only the search space that is in a QCL relationship with the specific beam direction or beam group direction in the corresponding COT.

[0208] For the following reasons, it may be desirable to configure all DL signals / channels (or all UL signals / channels) included in one Tx burst as signals / channels having a spatial (partial) QCL relationship. Figure 8 As shown, when the BS sends a Tx burst consisting of a total of 4 time slots after succeeding in LBT, the BS can send a signal in 3 time slots in the beam direction of A, and then send a signal in the fourth time slot in the beam direction of C.

[0209] However, when the BS transmits a signal in the beam direction of A, the Wi-Fi AP coexisting in the corresponding U band may not detect the signal transmitted in the beam direction of A and determine that the channel is idle. After the LBT succeeds, the Wi-Fi AP can start sending and receiving signals. In this case, if the BS transmits a signal in the beam direction of C starting from time slot #k+3, the signal may act as interference to the corresponding Wi-Fi signal. Therefore, when the BS that has performed transmission in the direction of A performs transmission by switching the beam direction without additional LBT, the BS may cause interference with another coexisting wireless node. Therefore, it may be desirable not to switch the Tx beam direction of the Tx burst transmitted after the LBT of the BS succeeds.

[0210] In the NR system, a method of signaling beam information to be used by the UE during UL transmission and reception by associating a DL signal and a UL signal is being considered. For example, if there is a beam direction generated by the UE on a channel state information reference signal (CSI-RS) resource by associating the CSI-RS resource with a sounding reference signal (SRS) resource, when the UE sends an SRS on an SRS resource linked to the CSI-RS resource (or when the UE sends a PUSCH scheduled by a UL grant, the SRS resource linked to the CSI-RS resource is signaled by the UL grant), the UE can use the Tx beam corresponding to the CSI-RS Rx beam to send a UL signal. In this case, the UE can configure the relationship between a specific Rx beam and a specific Tx beam in an implementation when there is a beam corresponding capability of the UE. Alternatively, when there is no beam corresponding capability of the UE, the relationship between a specific Rx beam and a specific Tx beam can be configured by training the BS and the UE.

[0211] Therefore, when defining the association relationship between a DL signal and a UL signal, COT sharing can be allowed between a DL Tx burst consisting of a DL signal / channel in a spatial (partial) QCL relationship with the DL signal and a UL Tx burst consisting of a UL signal / channel in a spatial (partial) QCL relationship with the UL signal associated with the DL signal.

[0212] Here, the UL signal / channel may include at least one or more of the following signals / channels:

[0213] -SRS, Demodulation Reference Signal (DMRS) for PUCCH, DMRS for PUSCH, PUCCH, PUSCH, or PRACH

[0214] Here, the DL signal / channel may include at least one or more of the following signals / channels:

[0215] -PSS, SSS, DMRS for PBCH, PBCH, Tracking Reference Signal (TRS), CSI-RS for tracking, CSI-RS for CSI acquisition, CSI-RS for Radio Resource Management (RRM) measurement, CSI-RS for BM, DMRS for PDCCH, DMRS for PDSCH, PDCCH (or Control Resource Set (CORESET) in which PDCCH can be transmitted), PDSCH, or a modified signal of the above-listed signals or related signals or a newly introduced signal, arranged in front of the Tx burst for tracking, (fine) time / frequency synchronization, coexistence, power saving or frequency reuse factor = 1

[0216] Meanwhile, each proposed method described later may be combined with and applied together with the other proposed methods unless each proposed method conflicts with the other proposed methods.

[0217] Before describing the proposed method of the present disclosure, the overall operation procedures of a UE, a BS, and a network for implementing the proposed method of the present disclosure will now be described.

[0218] Fig. 9 is a diagram illustrating an overall operation procedure of a UE or a BS for transmitting DL / UL signals based on the proposed method of the present disclosure.

[0219] refer to Fig. 9 , the UE or BS may perform first sensing based on at least one first sensing beam (S901). In this case, the at least one first sensing beam may be a beam covering multiple Tx beams. One first sensing beam may cover all multiple Tx beams, or multiple sensing beams may cover corresponding Tx beams respectively.

[0220] The first sensing may be performed based on at least one of [Proposed Method #1] to [Proposed Method #3].

[0221] When at least one of the multiple Tx beams is determined to be idle in the first sensing, the UE or BS may perform the second sensing based on at least one second sensing beam (S903). In this case, the at least one second sensing beam may be a beam covering multiple Tx beams. One second sensing beam may cover all multiple Tx beams, or multiple sensing beams may cover corresponding Tx beams respectively.

[0222] The second sensing may be performed based on at least one of [the proposed method #1] to [the proposed method #3]. Meanwhile, when [the proposed method #1] is implemented alone or continuous transmission between the configuration grant-physical uplink shared channel (CG-PUSCH) and the dynamic grant-physical uplink shared channel (DG-PUSCH) is allowed in [the proposed method #3] (for example, the conditions of [embodiment #3-1] of [the proposed method #3] are satisfied), step S903 may be omitted.

[0223] Based on the fact that at least one Tx beam is idle as a result of determination through the first sensing and / or the second sensing, the UE may transmit at least one UL signal corresponding to the Tx beam determined to be idle, or the BS may transmit at least one DL signal corresponding to the Tx beam determined to be idle (S905). In this case, the UL signal or the DL signal transmitted by the UE or the BS may be based on at least one of [Proposed Method #1] to [Proposed Method #3].

[0224] Fig.10 is a diagram illustrating an overall operation procedure of a UE or a BS for receiving a DL / UL signal based on the proposed method of the present disclosure.

[0225] refer to Fig.10 , the UE or the BS may determine at least one Rx beam for receiving at least one DL signal or at least one UL signal through at least one Tx beam (S1001).

[0226] In addition, the UE or the BS may receive at least one DL signal or at least one UL signal transmitted based on at least one of [Method #1] to [Method #3] through at least one Rx beam (S1003).

[0227] Fig.11 is a diagram illustrating an overall operation process of a network for transmitting DL / UL signals based on the proposed method of the present disclosure.

[0228] refer to Fig.11 , the UE or BS may perform first sensing based on at least one first sensing beam (S1101). In this case, the at least one first sensing beam may be a beam covering multiple Tx beams. One first sensing beam may cover all multiple Tx beams, or multiple first sensing beams may cover corresponding Tx beams respectively.

[0229] The first sensing may be performed based on at least one of [Proposed Method #1] to [Proposed Method #3].

[0230] When at least one of the multiple Tx beams is determined to be idle in the first sensing, the UE or BS may perform the second sensing based on at least one second sensing beam (S1103). In this case, the at least one second sensing beam may be a beam covering multiple Tx beams. One second sensing beam may cover all multiple Tx beams, or multiple sensing beams may cover corresponding Tx beams respectively.

[0231] The second sensing may be performed based on at least one of [Proposed Method #1] to [Proposed Method #3]. Meanwhile, when [Proposed Method #1] is implemented alone or continuous transmission between CG-PUSCH and DG-PUSCH is allowed in [Proposed Method #3] (for example, satisfying the conditions of [Embodiment #3-1] of [Proposed Method #3]), step S1103 may be omitted.

[0232] Based on at least one Tx beam being idle as a result of determination through the first sensing and / or the second sensing, the UE may transmit at least one UL signal corresponding to the Tx beam determined to be idle, or the BS may transmit at least one DL signal corresponding to the Tx beam determined to be idle (S1105). In this case, the UL signal or the DL signal transmitted by the UE or the BS may be based on at least one of [Proposed Method #1] to [Proposed Method #3].

[0233] [Proposed Method #1]

[0234] (i) a method for determining, for transmission in a specific beam direction or multi-beam transmission through TDM and / or SDM multiplexing, one LBT type among wide-beam LBT based on random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) and narrow-beam LBT based on random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT); and (ii) a method for differently configuring an ED threshold according to an LBT type and a transmission type (e.g., unicast and / or broadcast) and a method for sharing a COT

[0235] Example #1-1

[0236] A method of selecting an LBT method according to the capability of the UE (e.g., performing wide-beam LBT when the UE cannot perform narrow-beam LBT)

[0237] In this case, the capability of the UE may refer to beam correspondence (BC) capability. In addition, when the UE does not support BC capability so that the UE requires UL beam management in order to meet the BC requirement, only wide beam LBT may be allowed for the UE. In addition, before UL beam management, only wide beam LBT may always be allowed for the UE.

[0238] Example #1-2

[0239] A method of selecting an LBT method considering COT sharing (e.g., if COT is allowed (or performed), narrow beam LBT is performed, and otherwise wide beam LBT is performed)

[0240] Example #1-3

[0241] A method of selecting an LBT method according to a Tx length of a Tx beam (for example, if the Tx length is longer than or equal to a threshold, a narrow beam LBT is performed, and if the Tx length is shorter than the threshold, a wide beam LBT is performed)

[0242] Here, in the case of multi-beam transmission, the Tx beam (or reference beam) to be compared with the threshold can be determined based on the beam with the longest Tx length among the beams to be multiplexed, or based on the beam previously configured / indicated by the BS or randomly selected by the UE.

[0243] Examples #1-4

[0244] Method of configuring / allowing maximum channel occupation time (MCOT) differently according to LBT method (e.g., according to whether LBT is wide beam LBT or narrow beam LBT)

[0245] Example #1-5

[0246] A method of selecting an LBT method according to the number of multiple beams to be transmitted in the COT (for example, if the number of Tx beams is less than a threshold, narrow beam LBT is performed, and if the number of Tx beams is greater than the threshold, wide beam LBT is performed)

[0247] Example #1-6

[0248] A method of differently configuring an ED threshold to be used for performing random backoff counter-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) depending on whether the transmission is broadcast transmission after wide-beam LBT or unicast transmission after narrow-beam LBT (in this case, COT sharing is not allowed for wide-beam LBT, and COT sharing operation may be supported only when performing narrow-beam LBT)

[0249] Here, wide beam may refer to a beam group including a specific beam set. If the beam group includes an omni-directional beam, this may refer to O-LBT. In addition, the thresholds in [Example #1-3] and [Example #1-4] may be the same or different. The threshold may be based on a value previously configured / indicated by the BS or defined in a standard.

[0250] In the high frequency U-band, DL / UL transmission with directionality can be performed in a specific beam direction by beamforming instead of omnidirectionally. Therefore, it may be efficient to perform LBT in a specific beam direction to be transmitted instead of omnidirectionally, and to perform transmission in an area affected by interference of the corresponding beam. However, depending on the capabilities of the UE, narrow beam LBT performed only in a specific beam direction may not be supported. In addition, even if the UE supports both LBT methods, it is necessary to determine the LBT method to be performed before actual transmission.

[0251] For transmission in a specific beam direction or multi-beam transmission, both narrow beam LBT and wide beam LBT can be applied. Here, since COT sharing may be allowed or not allowed depending on the type of LBT to be performed, the BS or UE may selectively determine the LBT method depending on whether COT sharing is allowed.

[0252] In particular, in order to perform multi-beam transmission multiplexing by TDM and / or SDM in COT, since LBT may have to be performed for all beam directions and interference areas in which multiplexed transmission is performed in COT, narrow beam LBT can be performed sequentially in each direction of the beam to be multiplexed, or LBT can be performed simultaneously in all directions of the beam to be multiplexed.

[0253] In addition, when performing broadcast transmission (such as transmission of SSB or beam management SRS) or performing unicast transmission (such as transmission of PDSCH or PUSCH), the type of LBT (e.g., wide beam LBT or narrow beam LBT) and the ED threshold value may be selected differently. In addition, the type of LBT to be used for the LBT among the wide beam LBT and the narrow beam LBT may be determined according to the Tx length of the beam to be multiplexed or the number of beams.

[0254] Because a UE that does not support narrow beam LBT due to its capabilities can perform only wide beam LBT, the UE can always perform transmission in a specific beam direction. Alternatively, a UE that does not support narrow beam LBT can always perform wide beam LBT based on random backoff counter-based LBT (Cat-3 LBT or Cat-4 LBT) during multi-beam transmission, and start DL / UL transmission when wide beam LBT succeeds. In this case, the capability of the UE may refer to BC capability, and for a UE that does not support BC capability, only wide beam LBT may be allowed, so that the UE requires UL beam management in order to meet the BC requirements. In addition, before UL beam management, only wide beam LBT may always be allowed for the UE.

[0255] Meanwhile, the requirements related to BC capabilities are as follows.

[0256] 1) Even without beam management such as UL beam sweeping and UL beam indication by the network, a UE supporting beamCorrespondenceWithoutUL-BeamSweeping can correctly match BC. In this case, even without beam management, requirements such as minimum peak effective isotropic radiated power (EIRP) and spherical coverage should be met. Therefore, a UE supporting the corresponding capability (i.e., a UE supporting beamCorrespondenceWithoutUL-BeamSweeping) can be allowed to perform narrow beam LBT, and can also be allowed to perform wide beam LBT.

[0257] 2) UEs that do not support beamCorrespondenceWithoutUL-BeamSweeping can meet requirements such as minimum peak EIRP and spherical coverage through the beam management process. In addition, even without beam management, UEs that do not support beamCorrespondenceWithoutUL-BeamSweeping can meet the relaxation requirements of about 3dB.

[0258] Therefore, a UE supporting the corresponding capability (i.e., a UE that does not support beamCorrespondenceWithoutUL-BeamSweeping) may not be allowed to perform narrow beam LBT, and may only be allowed to perform wide beam LBT. Alternatively, even for a UE supporting the corresponding capability (i.e., a UE that does not support beamCorrespondenceWithoutUL-BeamSweeping), it may not be allowed to perform narrow beam LBT before the UL beam management process, and may be allowed to perform only wide beam LBT. However, narrow beam LBT may also be performed after the UL beam management process.

[0259] On the other hand, only when performing narrow beam LBT based on random backoff counter based LBT (e.g., Cat-3 LBT or Cat-4 LBT), a COT sharing operation in which a COT acquired by success in a random backoff counter based LBT (e.g., Cat-3 LBT or Cat-4 LBT) can be transmitted may be allowed, and when performing wide beam LBT based on random backoff counter based LBT (e.g., Cat-3 LBT or Cat-4 LBT), a COT sharing operation in which a COT acquired by success in a random backoff counter based LBT (e.g., Cat-3 LBT or Cat-4 LBT) can be transmitted may not be allowed. In this case, the BS or UE may perform LBT by selecting one of the wide beam LBT and the narrow beam LBT according to whether the remaining COT is transmitted to another node after the BS or UE performs transmission.

[0260] In addition, when performing transmission in a specific beam direction or multi-beam transmission, the LBT method can be selected according to the Tx length of the Tx beam. For example, if the Tx length is longer than the threshold, narrow beam LBT can be performed, and if the Tx length is shorter than the threshold, wide beam LBT can be performed.

[0261] The threshold used as a standard may be a value previously configured / indicated by the BS or defined in a standard.

[0262] In the case of multi-beam transmission, the Tx beam to be compared with the threshold can be determined based on one of the following criteria, namely, based on (i) the beam with the longest Tx length among the beams to be multiplexed, (ii) the beam previously configured / indicated by the BS, or (iii) the beam arbitrarily selected by the UE.

[0263] On the contrary, the Tx length may be configured differently depending on the type of LBT performed. For example, the MCOT of the BS or UE may be configured differently depending on whether the LBT performed is a wide beam LBT or a narrow beam LBT. For example, if the MCOT is as high as 5 ms when the BS or UE performs narrow beam LBT, 3 ms shorter than 5 ms may be allowed as the MCOT length when the BS or UE performs wide beam LBT.

[0264] In the case of multi-beam transmission, the LBT method can be selected according to the number of multiple beams to be transmitted in the COT. For example, if the number of Tx beams is less than a threshold, narrow beam LBT can be performed, and when the number of Tx beams is greater than a threshold, wide beam LBT can be performed. The threshold as a standard can be a value indicated by the BS or defined in the standard.

[0265] The ED threshold (which is a criterion for determining whether a channel is idle or busy when performing LBT) may be configured differently depending on whether the transmission is a broadcast transmission after a wide beam LBT or a unicast transmission after a narrow beam LBT. For example, since it is necessary to transmit (for example) SSB or beam management SRS in multiple beam directions by beam scanning, the ED threshold to be used when performing a wide beam LBT based on a random backoff counter (for example, Cat-3 LBT or Cat-4 LBT) may be configured to be a higher value than the ED threshold to be used when performing a narrow beam LBT based on a random backoff counter (for example, Cat-3 LBT or Cat-4 LBT) performed for transmission in a specific beam direction. In this case, COT sharing may not be allowed for wide beam LBT, and COT sharing operation may be supported only when performing narrow beam LBT.

[0266] According to [Example #1-1], by determining whether to perform narrow beam LBT based on whether the UE supports BC and whether beam management is configured, errors in the operation of the UE can be eliminated, and operations suitable for the capabilities of the UE can be performed. In addition, when the capabilities of the UE cannot support narrow beam LBT (i.e., when the UE does not have the ability to perform narrow beam LBT), conflicts with other transmissions can be prevented by conservatively performing wide beam LBT.

[0267] According to [Example #1-2] to [Example #1-6], wide-beam LBT can be used to prevent a node from excessively occupying a relatively wide range of space for a long time, so that the impact of a node on the transmission and reception of other nodes can be minimized.

[0268] [Proposed Method #2] Perform independent per-beam LBT for TDM and / or SDM based multi-beam transmission in multiple beam directions in COT

[0269] Example #2-1

[0270] LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) is performed for beams individually and simultaneously. DL / UL transmission corresponding to the beam direction for which LBT is first completed (e.g., LBT corresponding to the beam first determined to be idle) is not performed, and DL / UL transmission is postponed by self-postponement until LBT for the remaining beam directions is completed. After LBT for all beams is completed or immediately before LBT for a specific direction is completed (e.g., immediately before DL / UL transmission through multiple beams), it is briefly determined whether all beam directions are idle or busy. DL / UL transmission corresponding to at least one beam direction for which LBT is successful (e.g., at least one beam direction determined to be idle) may be performed by SDM and / or TDM. When briefly determining whether all beam directions are idle or busy, idle or busy may be determined by performing a single CCA slot LBT or an LBT that is not a backoff counter-based LBT (e.g., Cat-2 LBT).

[0271] Here, a beam for which a random backoff counter-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) is performed individually and simultaneously and for which a CCA slot LBT or an LBT not based on a random backoff counter-based LBT (e.g., Cat-2 LBT) is briefly performed may refer to a sensing beam. In addition, one sensing beam may correspond to one Tx beam among a plurality of Tx beams multiplexed by TDM and / or SDM. DL / UL transmission corresponding to a sensing beam may refer to DL / UL transmission in which transmission is performed through a Tx beam corresponding to the sensing beam.

[0272] Here, each individual beam may have a backoff counter value according to the configuration / instruction of the BS. For example, when N Tx beams are multiplexed and LBT (e.g., Cat-3 LBT or Cat-4 LBT) based on a random backoff counter is performed simultaneously by N sensing beams corresponding to the N Tx beams, a backoff counter value may be independently determined for each of the N sensing beams. In addition, the backoff counter value may be reduced only with respect to the sensing beam determined to be idle as a result of performing LBT on the N sensing beams simultaneously and in parallel. Alternatively, all multiplexed beams may have a common backoff counter value. For example, when N Tx beams are multiplexed and LBT (e.g., Cat-3 LBT or Cat-4 LBT) based on a random backoff counter is performed on the N sensing beams corresponding to the N Tx beams, a common backoff counter value may be determined for all N sensing beams. In addition, the common backoff counter value may be decreased only when all N sensing beams are determined to be idle or a specific number of sensing beams among the N sensing beams are determined to be idle as a result of performing LBT on the N sensing beams simultaneously and in parallel.

[0273] In the case of SDM, since it may be difficult to discard only some beams and start transmission, DL / UL transmission for SDM may be performed only when LBT for all beams succeeds. If LBT for some beams fails, DL / UL transmission for all beams may be discarded, and the LBT process may be performed again. However, in the case of SDM and / or TDM, if only some of the multiplexed beams succeed in LBT (for example, the backoff counter value according to LBT becomes 0, or the backoff counter value becomes 0 before the transmission start timing, so that self-postponement is performed and short CCA succeeds immediately before the start of transmission), DL / UL transmission only for the beams corresponding to the successful LBT may be performed, and DL / UL transmission only for the beams corresponding to the remaining failed LBT may be discarded.

[0274] In embodiment #1-1, SDM in COT may refer to multiplexing multiple beams using different spatial regions at the same time (e.g., the same time slot) in COT. TDM in COT may refer to multiplexing multiple beams at multiple times (e.g., multiple time slots) in COT. Therefore, if multiple beams are multiplexed by SDM and TDM, this may mean that multiple beam groups (including a portion of multiple beams) multiplexed by SDM at the same time (e.g., the same time slot) among the multiple beams are multiplexed by TDM at multiple times (e.g., multiple time slots) in COT.

[0275] 2. Example #2-2

[0276] A representative beam direction is determined among multiple multiplexed beams. LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) is performed only in the representative beam direction. Immediately before the LBT in the representative beam direction is completed (e.g., immediately before DL / UL transmission through multiple beams), LBT that is not based on random backoff (e.g., Cat-2 LBT) or single CCA slot LBT is performed in the remaining beam directions. In addition, the beam corresponding to the beam direction in which LBT that is not based on random backoff (e.g., Cat-2 LBT) or single CCA slot LBT is successful may be transmitted through SDM and / or TDM.

[0277] [Method of determining a representative beam direction to perform random backoff counter-based LBT (eg, Cat-3 LBT or Cat-4 LBT)]

[0278] 1) In the case of TDM, the beam direction to be sent first

[0279] 2) The beam direction with the maximum EIRP value

[0280] 3) Beam direction arbitrarily selected by UE

[0281] 4) Beam direction previously configured / indicated by the BS

[0282] 5) Determine the beam direction of the maximum backoff counter value

[0283] Here, the beam on which LBT is to be performed may refer to a sensing beam. In addition, one sensing beam may correspond to one Tx beam among a plurality of Tx beams multiplexed by TDM and / or SDM. A DL / UL transmission corresponding to a sensing beam may refer to a DL / UL transmission in which transmission is performed by a Tx beam corresponding to the sensing beam.

[0284] Here, [Embodiment #2-2] can be applied only when the UE or BS has the capability to simultaneously perform LBT (e.g., Cat-3 LBT or Cat-2 LBT) in beam directions to be multiplexed by SDM and / or TDM. When Cat-4 based LBT is used, one contention window size (CWS) value may be updated based on A / N according to the configuration / instruction of the BS, or the CWS value may be updated independently for each beam.

[0285] In the case of SDM, since it may be difficult to discard only some beams and start transmission, DL / UL transmission for SDM may be performed only when LBT for all beams succeeds. If LBT for some beams fails, DL / UL transmission for all beams may be discarded, and the LBT process may be performed again. However, in the case of SDM and / or TDM, if only some of the multiplexed beams succeed in LBT (for example, the backoff counter value according to LBT becomes 0, or the backoff counter value becomes 0 before the transmission start timing, so that self-postponement is performed and short CCA succeeds immediately before the start of transmission), only DL / UL transmission for the beams corresponding to the successful LBT may be performed, and only DL / UL transmission for the beams corresponding to the remaining failed LBT may be discarded.

[0286] The 3GPP TS 37.213 document related to the channel access procedure of Rel-16 NR-U discloses the definition of a multi-channel access procedure and channels of type A / B. Type A indicates a method of performing a separate Cat-4 LBT for each channel. Type B indicates a method of performing Cat-4 LBT for one representative channel and performing a single CCA slot LBT or Cat-2 LBT for the remaining channels immediately before the Cat-4 LBT of the representative channel is completed, thereby performing DL / UL transmission for the channel where LBT is successful.

[0287] In the high frequency U-band at 52.6 GHz, the concept of type A / B multi-channel access process can be extended to the spatial domain, so that the multi-channel access process can be used when independent per-beam LBT is performed based on random backoff counter-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) for transmission of multiple beams multiplexed via TDM and / or SDM.

[0288] First, according to [Example #2-1], similar to the multi-channel access process of Type A, LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) is performed separately and simultaneously for multiple beams to be transmitted through SDM and / or TDM. For the beam direction that completes LBT first (e.g., LBT corresponding to the beam that is first determined to be idle), the DL / UL transmission corresponding to the beam direction that completes LBT first is not performed and is postponed by self-postponement until the LBT of the remaining beam directions is completed. After completing the LBT of all beams or immediately before completing the LBT of a specific direction (e.g., immediately before DL / UL transmission through multiple beams), it is briefly determined whether all beam directions are idle or busy, and DL / UL transmission corresponding to at least one beam direction in which transmission is successful (e.g., at least one beam direction determined to be idle) can be performed through SDM and / or TDM.

[0289] When briefly determining whether all beam directions are idle or busy, idle or busy may be determined by performing a single CCA slot LBT or a Cat-2 LBT that is not based on random backoff.

[0290] For example, refer to Fig.12 (a) Four Tx beams (e.g., Tx beam #1 to Tx beam #4) corresponding to four beams from beam #1 to beam #4, respectively, are scheduled in COT by SDM and / or TDM. Here, beams #1 to #4 may respectively refer to sensing beams corresponding to the four Tx beams. In other words, beams #1 to #4 may respectively refer to sensing beams #1 to #4.

[0291] The BS or UE may simultaneously start LBT (e.g., Cat-3 LBT or Cat-4 LBT) based on a random backoff counter for four beams from beam #1 to beam #4. If LBT for beam #1 is completed earlier than LBT for beams #2 to #4, DL / UL transmission through Tx beam #1 corresponding to beam #1 does not start immediately. In other words, DL / UL transmission through Tx beam #1 is not performed until LBT for beams #2 to #4 is completed and DL / UL transmission through Tx beam #1 can wait by self-delay.

[0292] Next, if LBT for beams #2 to #4 is completed sequentially, immediately before the end timing of the last completed LBT for beam #4 or immediately before DL / UL transmission multiplexed by SDM and / or TDM (e.g., immediately before the start of the COT including DL / UL transmission multiplexed by SDM and / or TDM), a single CCA slot LBT or an LBT other than a random backoff-based LBT (e.g., Cat-2 LBT) is performed to determine whether the beam is idle or busy. If it is determined that beams #1 to #4 are idle, DL / UL transmission multiplexed by SDM and / or TDM may be performed in the corresponding COT.

[0293] However, if random backoff-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) for at least one beam (e.g., beam #4) among beams #1 to beam #4 is unsuccessful (i.e., random backoff-based LBT fails), until the start of the COT or until a predetermined time from the time immediately before the start of the COT (e.g., until the time required to perform Cat-2 LBT from the time immediately before the start of the COT), only a single CCA slot or LBT that is not random backoff-based LBT (e.g., Cat-2 LBT) is performed for the remaining beams (e.g., beam #1 to beam #3) except the failed beams to determine that the corresponding beams are space or busy. If it is determined that beams #1 to beam #3 are idle, DL / UL transmission multiplexing by SDM and / or TDM may be performed in the corresponding COT.

[0294] Here, a single CCA slot refers to a unit for performing channel measurement to determine whether a channel is idle / busy when performing LBT based on a random backoff counter (eg, Cat-3 LBT or Cat-4 LBT). When the channel is idle, the backoff counter value may be reduced by 1.

[0295] In this case, each individual beam may have a backoff counter value according to the configuration / instruction of the BS. For example, when N Tx beams are multiplexed and LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) is performed simultaneously by N sensing beams corresponding to the N Tx beams, a backoff counter value may be independently determined for each of the N sensing beams. In addition, the backoff counter value may be reduced only for the sensing beam determined to be idle as a result of performing LBT on the N sensing beams simultaneously and in parallel. Alternatively, all multiplexed beams may have a common backoff counter value. For example, when N Tx beams are multiplexed and LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) is performed on the N sensing beams corresponding to the N Tx beams, a common backoff counter value may be determined for all N sensing beams. In addition, the common backoff counter value may be reduced only when all N sensing beams are determined to be idle or a specific number of sensing beams among the N sensing beams are determined to be idle as a result of performing LBT on the N sensing beams simultaneously and in parallel. In the case of SDM, since it may be difficult to discard only some beams and start transmission, DL / UL transmission for SDM may be performed only when LBT for all beams succeeds. If LBT for some beams fails, DL / UL transmission for all beams may be discarded, and the LBT process may be performed again. However, in the case of SDM and / or TDM, if the sensing beam corresponding to the partially multiplexed Tx beam succeeds in LBT (for example, the backoff counter value according to LBT becomes 0, or the backoff counter value becomes 0 before the transmission start timing, so that self-postponement is performed and the short CCA succeeds immediately before the start of transmission), DL / UL transmission only for the Tx beam associated with the sensing beam corresponding to the successful LBT may be performed, and DL / UL transmission only for the Tx beam associated with the sensing beam corresponding to the remaining failed LBT may be discarded.

[0296] According to [Example #2-1], DL / UL signals can be predictably transmitted at the scheduled timing in the same COT through the multiplexed Tx beam. In other words, even if the LBT success timing of the sensing beam corresponding to the multiplexed Tx beam is different, DL / UL transmission can be performed at the scheduled timing of the DL / UL signal, thereby reducing the predictability and complexity of the transmission. In addition, LBT is performed on all sensing beams corresponding to all Tx beams, so that the reliability of the measurement results for the Tx beams can be increased, and conflicts with other signals can be minimized. In addition, when the backoff counter value corresponding to a specific sensing beam becomes 0 and DL / UL transmission is started through the Tx beam corresponding to the specific beam, since LBT and transmission cannot be performed at the same time, the DL / UL transmission corresponding to the remaining sensing beams can be automatically discarded. Therefore, from the perspective of overall transmission, DL / UL transmission opportunities may be reduced, and the discarded DL / UL transmission needs to be rescheduled. Therefore, transmission delay may increase and resource efficiency may decrease. According to [Example #2-1], the above-mentioned problems can be solved / prevented.

[0297] At the same time, according to [Example #2-2], similar to the multi-channel access process of type B, a representative beam direction is determined among multiple beams to be sent through SDM and / or TDM. LBT based on a random backoff counter (e.g., Cat-3 LBT or Cat-4 LBT) is performed only in the representative beam direction. Immediately before the LBT in the representative beam direction is completed (e.g., immediately before DL / UL transmission through multiple beams), LBT that is not based on random backoff (e.g., Cat-2 LBT) or a single CCA slot LBT is performed in the remaining beam directions. In addition, DL / UL transmission corresponding to the beam direction in which LBT that is not based on random backoff (e.g., Cat-2 LBT) or a single CCA slot LBT is successful can be performed through SDM and / or TDM.

[0298] For example, refer to Fig.12(b) illustrates a case where beam #4 among beams #1 to #4 is determined as a representative beam. In this case, LBT (Cat-3 LBT or Cat-4 LBT) based on a random backoff counter is performed only for beam #4. When beam #4 is determined to be idle by LBT for beam #4, immediately before the LBT for beam #4 is completed (for example, immediately before DL / UL transmission through multiple beams), LBT that is not based on LBT based on random backoff (for example, Cat-2 LBT) or single CCA slot LBT is performed for beams #1 to beam #4. In addition, DL / UL transmission corresponding to a beam direction that has been successful in a single CCA slot LBT or an LBT that is not based on LBT based on random backoff (for example, Cat-2 LBT) can be performed in COT through SDM and / or TDM. Here, beams #1 to beam #4 may refer to sensing beams corresponding to four Tx beams, respectively. In other words, beams #1 to #4 may refer to sensing beam #1 to sensing beam #4, respectively.

[0299] The direction of a representative beam to be subjected to random backoff counter-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) may be determined by applying a method among the following methods: 1) the direction of the beam to be transmitted first in case of TDM, 2) the direction of the beam with the maximum EIRP value, 3) the beam direction arbitrarily selected by the UE, 4) the beam direction previously configured / indicated by the BS, and 5) the beam direction for which the maximum backoff counter value is determined. Here, the direction of the representative beam may be applied only when the UE or BS has the capability of simultaneously performing LBT (e.g., Cat-3 LBT or Cat-2 LBT) in the beam direction to be subjected to SDM and / or TDM.

[0300] When Cat-4 based LBT is used, according to the configuration / instruction of the BS, one CWS value may be updated based on the A / N, or the CWS value may be updated independently for the corresponding beam.

[0301] In the case of SDM, since it may be difficult to discard only some beams and start transmission, DL / UL transmission for SDM may be performed only when LBT for all beams succeeds. If LBT for some beams fails, DL / UL transmission for all beams may be discarded, and the LBT process may be performed again. However, in the case of SDM and / or TDM, if only some of the multiplexed beams succeed in LBT (for example, the backoff counter value according to LBT becomes 0, or the backoff counter value becomes 0 before the transmission start timing, so that self-postponement is performed and short CCA succeeds immediately before the start of transmission), DL / UL transmission only for the beams corresponding to the successful LBT may be performed, and DL / UL transmission only for the beams corresponding to the remaining failed LBT may be discarded.

[0302] According to [Example #2-2], when multiple Tx beams are multiplexed, it is not necessary to perform LBT corresponding to all Tx beams, and LBT corresponding to only one beam can be performed, so that the complexity of the process caused by LBT and the processing complexity of the UE can be reduced.

[0303] [Proposed method #3] When a CG-PUSCH is transmitted after performing a random backoff counter-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) on a CG resource preconfigured by the BS and there is a scheduled DG-PUSCH in the middle of the CG-PUSCH transmission, a method of performing CG-DG PUSCH back-to-back transmission according to the following conditions

[0304] For example, refer to Fig.13 , when the UE performs LBT (e.g., Cat-3 LBT or Cat-4 LBT) to transmit CG-PUSCH in time slot (N+k) and time slot (N+k+1), DG-PUSCH may be scheduled in time slot N+k+m through downlink control information (DCI). For example, before performing LBT or LBT success, DG-PUSCH scheduling may be confirmed through DCI. Alternatively, DG-PUSCH scheduling may be confirmed through DCI after LBT success, before transmitting CG-PUSCH, or after transmitting CG-PUSCH.

[0305] In this case, a condition for continuously transmitting DG-PUSCH after transmitting CG-PUSCH without a separate LBT for DG-PUSCH will be described.

[0306] The transmission direction of CG-PUSCH can be pre-configured through spatialrelationinfo, or can be indicated by activating the SRS resource indicator (SRI) field in DCI. In addition, if the unified transmission configuration indication (TCI) state is supported and the TCI corresponds to the joint TCI and / or DL / UL separate TCI, the transmission direction of CG-PUSCH can be indicated by the UL TCI state.

[0307] 1. Example #3-1

[0308] DG-PUSCH transmission can be performed continuously without LBT immediately after CG-PUSCH transmission when (i) there is no gap between the end symbol of CG-PUSCH and the start symbol of DG-PUSCH on the time axis, (ii) the bandwidth of the CG-PUSCH sent on the frequency axis is the same as the bandwidth of the scheduled DG-PUSCH or the bandwidth allocated to DG-PUSCH is a subset of the bandwidth allocated to CG-PUSCH, and (iii) the Tx beam direction indicated for DG-PUSCH is included in the Tx beam direction of CG-PUSCH or the Tx beam direction indicated for DG-PUSCH is equal to the Tx beam direction of CG-PUSCH.

[0309] Here, the sum of the transmission lengths of DG-PUSCH and CG-PUSCH should not exceed MCOT.

[0310] 2. Example #3-2

[0311] In order to ensure an LBT gap for DG-PUSCH before DG-PUSCH transmission, when (i) there is a gap between the end symbol of CG-PUSCH and the start symbol of DG-PUSCH on the time axis, (ii) the bandwidth of the CG-PUSCH sent on the frequency axis is not the same as the bandwidth of the scheduled DG-PUSCH or the bandwidth allocated to the DG-PUSCH is not a subset of the bandwidth of the CG-PUSCH, or (iii) the beam direction indicated for the DG-PUSCH is not included in the Tx beam direction of the CG-PUSCH or the beam direction indicated for the DG-PUSCH is not equal to the Tx beam direction of the CG-PUSCH, at least one last CG-PUSCH symbol before the symbol i of time slot n before the scheduled DG-PUSCH may be discarded according to the mechanism of Clause 11.1 of 3GPP TS 38.213 as described in Clause 4.2.1.0.1 of 3GPP TS37.213.

[0312] Here, the values ​​of each of X, Y, and Z for X symbols, Y CG-PUSCHs, or Z time slots to be discarded for the LBT gap may use a value specified in the specification or a value previously configured / indicated by the BS through a higher layer signal (e.g., radio resource control (RRC)), a physical layer signal (e.g., DCI), or a combination of a higher layer signal and a physical layer signal.

[0313] In the proposed method, back-to-back transmission of DG-PUSCH to CG-PUSCH can be performed by changing the order (i.e., CG-PUSCH to DG-PUSCH or DG-PUSCH to CG-PUSCH). However, in [Example #3-2], when the priority of DG-PUSCH is higher than the priority of CG-PUSCH, if there is a gap or the LBT subband resources of DG-PUSCH and the LBT subband resources of CG-PUSCH are different, the UE can discard the transmission of CG-PUSCH after DG-PUSCH. Here, if the priority of DG-PUSCH is higher than the priority of CG-PUSCH, it can be explained as follows.

[0314] 1) Since DG-PUSCH is a scheduling-based signal, DG-PUSCH has a higher priority than CG-PUSCH.

[0315] 2) The channel access priority level (CAPC) value configured for DG-PUSCH is less than the CAPC value configured for CG-PUSCH.

[0316] In addition, including the Tx beam direction of DG-PUSCH in the Tx beam direction of CG-PUSCH may mean that the Tx beam of CG-PUSCH has a relatively large bandwidth relative to the Tx beam of DG-PUSCH Tx beam, so that the Tx beam of CG-PUSCH includes all interference areas in which DG-PUSCH has an interference effect when DG-PUSCH is transmitted in a specific beam direction.

[0317] In addition, if the beam directions of CG-PUSCH and DG-PUSCH are the same, this may be indicated by the beam directions indicated by CG-PUSCH and DG-PUSCH being the same spatialrelationinfo, the same SRI field, or the same joint TCI state (UL TCI state in the case of DL / UL separate TCI).

[0318] In LTE LAA, when DG-PUSCH is scheduled with AUL-PUSCH (autonomous UL access) in consecutive subframes without gaps, transmission operation without LBT is supported (Clause 4.2.1 of 3GPP TS 37.213). Similarly, in the case of sending CG-PUSCH based on Cat-4 LBT in NR-U, if DG-PUSCH is continuously scheduled without gaps using the CG timeline resources configured for the UE (i.e., CG-DG back-to-back scheduling), DG-PUSCH can be sent without LBT. However, in NR-U, multiple LBT subbands may be included in the bandwidth of the CG resources because, unlike LTE, the bandwidth of the CG resources configured for the UE is greater than 20MHz. Therefore, in order to continuously send DG-PUSCH without LBT using the COT obtained through CG-PUSCH, the frequency band of the scheduled DG-PUSCH should be included in the frequency band of the CG-PUSCH. In other words, the LBT subband of DG-PUSCH should be a subset of the LBT subband of CG-PUSCH, or the LBT subband of DG-PUSCH should be the same as the LBT subband of CG-PUSCH. In addition, as in LTE LAA, there should be no gap between CG-PUSCH and DG-PUSCH. In other words, when there is no gap between the end symbol of CG-PUSCH and the start symbol of DG-PUSCH on the time axis, and when the LBT subband of the CG-PUSCH sent on the frequency axis is the same as the LBT subband of the scheduled DG-PUSCH or the LBT subband of the DG-PUSCH is included in the LBT subband resources of the CG-PUSCH, the DG-PUSCH can be sent immediately after the CG-PUSCH without LBT. For example, in Fig.13 In the case where the end symbol of CG-PUSCH is symbol #13 of time slot (N+k+1) and the start symbol of DG-PUSCH is symbol #0 of time slot (N+k+2) (i.e., m=2), or when the end symbol of CG-PUSCH is symbol #1 of time slot (N+k+1) and the start symbol of DG-PUSCH is symbol #(1+1) of time slot (N+k+1) (i.e., m=1), if the LBT subband of CG-PUSCH and the LBT subband resources of the scheduled DG-PUSCH are the same or the LBT subband resources of DG-PUSCH are included in the LBT subband of CG-PUSCH, DG-PUSCH can be sent without LBT immediately after CG-PUSCH.

[0319] The following table is extracted from the part related to AUL-DG PUSCH back-to-back transmission of feLAA and CG-DG PUSCH back-to-back transmission of NR-U of clause 4.2 of specification 3GPP TS 37.213 which accurately discloses the above-mentioned back-to-back transmission.

[0320] [Table 5]

[0321]

[0322]

[0323] Even in the NR system of the 60-GHz band, similar to NR-U, back-to-back transmission can be performed without LBT if the DG-PUSCH scheduled during the transmission of the CG-PUSCH meets specific conditions. However, since transmission / reception of a specific beam direction should be considered in addition to the time and frequency conditions in NR-U, additional conditions for the Tx beam directions for CG-PUSCH and DG-PUSCH need to be considered.

[0324] Therefore, in the 60-GHz band NR system, when (i) there is no gap between the end symbol of CG-PUSCH and the start symbol of DG-PUSCH on the time axis, (ii) the bandwidth of the CG-PUSCH transmitted on the frequency axis is the same as the bandwidth of the scheduled DG-PUSCH or the bandwidth to which the DG-PUSCH is allocated is a subset of the bandwidth to which the CG-PUSCH is allocated, and (iii) the Tx beam direction indicated for the DG-PUSCH is included in the Tx beam direction of the CG-PUSCH or the Tx beam direction indicated for the DG-PUSCH is equal to the Tx beam direction of the CG-PUSCH, DG-PUSCH transmission can be performed continuously immediately after the CG-PUSCH transmission without LBT.

[0325] Here, including the Tx beam direction of DG-PUSCH in the Tx beam direction of CG-PUSCH may mean that the Tx beam of CG-PUSCH has a relatively large bandwidth relative to the Tx beam of DG-PUSCH Tx beam, so that the Tx beam of CG-PUSCH includes all interference areas in which DG-PUSCH has an interference effect when DG-PUSCH is transmitted in a specific beam direction. In addition, if the beam directions of CG-PUSCH and DG-PUSCH are the same, this may mean that the beam directions indicated to CG-PUSCH and DG-PUSCH are indicated by the same spatialrelationinfo, the same SRI field, or the same joint TCI state (UL TCI state in the case of DL / UL separate TCI). The sum of the transmission lengths of DG-PUSCH and CG-PUSCH should not exceed MCOT.

[0326] Similarly, in addition to the time and frequency conditions of NR-U, conditions under which CG-DG PUSCH back-to-back transmission cannot be performed can also be considered with respect to the Tx beam direction. DG-PUSCH cannot be transmitted without LBT when (i) there is a gap between the end symbol of CG-PUSCH and the start symbol of DG-PUSCH on the time axis, (ii) the bandwidth of the CG-PUSCH sent on the frequency axis is not the same as the bandwidth of the scheduled DG-PUSCH or the bandwidth to which DG-PUSCH is allocated is not a subset of the bandwidth of CG-PUSCH, or (iii) the beam direction indicated for DG-PUSCH is not included in the Tx beam direction of CG-PUSCH or the Tx beam direction indicated for DG-PUSCH is not equal to the Tx beam direction of CG-PUSCH. To ensure an LBT gap before DG-PUSCH transmission, the UE may discard at least one last CG-PUSCH symbol before symbol i of slot n preceding the scheduled DG-PUSCH according to the mechanism of clause 11.1 of 3GPP TS 38.213 as described in clause 4.2.1.0.1 of 3GPP TS 37.213.

[0327] In addition, the same method can be applied even when the order of CG-PUSCH and DG-PUSCH is reversed, that is, even in the case of back-to-back transmission of DG-CG. In other words, when there is no time gap between DG-PUSCH and CG-PUSCH in the CG resources configured immediately after DG-PUSCH, and when the bandwidth of DG-PUSCH is the same as the bandwidth of CG-PUSCH or the bandwidth of CG-PUSCH is included in the bandwidth of DG-PUSCH, and when the Tx beam direction of CG-PUSCH is included in the Tx beam direction of DG-PUSCH or the Tx beam direction of CG-PUSCH is the same as the Tx beam direction of DG-PUSCH, CG-PUSCH can be continuously sent immediately after the end of DG-PUSCH transmission without LBT. However, since DG-PUSCH has a higher priority than CG-PUSCH, when there is a time gap between DG-PUSCH and CG-PUSCH, the bandwidths of DG-PUSCH and CG-PUSCH are different, or the Tx beam directions of DG-PUSCH and CG-PUSCH are different, the UE can abandon CG-PUSCH transmission instead of discarding DG-PUSCH symbols as in [Example #2-2].

[0328] According to [Proposed Method #3], as in Ref. Figure 8 As described, by allowing continuous transmission between CG-PUSCH and DG-PUSCH through the same beam as the beam performing LBT or a beam included in the beam area performing LBT, UL transmission can be performed through a space outside the interference area of ​​the beam on which LBT has been performed, thereby preventing interference with other radio nodes. In addition, since there is no need to perform random backoff-based LBT (e.g., Cat-3 LBT or Cat-4 LBT) for DG-PUSCH transmission, the transmission timing of DG-PUSCH can be increased by preventing transmission failure and delay of DG-PUSCH due to LBT failure.

[0329] 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 between devices (e.g., 5G).

[0330] More specific examples will be described below with reference to the accompanying drawings. In the following drawings / descriptions, similar reference numerals represent the same or corresponding hardware blocks, software blocks or functional blocks unless otherwise specified.

[0331] Fig.14 The diagram shows a communication system 1 applied to the present disclosure.

[0332] refer to Fig.14 , the communication system 1 applied to the present disclosure includes a wireless device, a BS and a network. A wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or new RAT) or LTE), also referred to 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, an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle (V2V) communication. Here, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices 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 smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, 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 the network may be implemented as wireless devices, and a specific wireless device 200a may serve as a BS / network node for other wireless devices.

[0333] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without the intervention of the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., V2V / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0334] Wireless communication / connection 150a, 150b, and 150c may be established between wireless devices 100a to 100f / BS 200 and between BSs 200. Here, wireless communication / connection may be established through various RATs (e.g., 5G NR) such as UL / DL communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication 150c (e.g., relay or integrated access backhaul (IAB). Wireless signals may be sent and received between wireless devices, between wireless devices and BSs, and between BSs through wireless communication / connection 150a, 150b, and 150c. For example, signals may be sent and received on various physical channels through wireless communication / connection 150a, 150b, and 150c. To this end, various configuration information configuration processes for sending / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of a resource allocation process may be performed based on various suggestions of the present disclosure.

[0335] Fig.15 The diagram illustrates a wireless device suitable for use with the present disclosure.

[0336] refer to Fig.15 , 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 Fig.14 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0337] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 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 flow charts disclosed in this document. For example, the processor 102 may process the 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 store a plurality of pieces of information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing part or all of the processes controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flow charts 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 send and / or receive wireless signals through one or more 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.

[0338] Specifically, instructions and / or operations controlled by the processor 102 of the first wireless device 100 and stored in the memory 104 of the first wireless device 100 according to an embodiment of the present disclosure will be described.

[0339] Although the following operations are described based on the control operations of the processor 102 in terms of the processor 102, software codes for performing such operations may be stored in the memory 104. For example, in the present disclosure, at least one memory 104 may be a computer-readable storage medium and may store instructions or programs. When the instructions or programs are executed, at least one processor operably connected to at least one memory may perform operations related to the following operations according to embodiments or implementations of the present disclosure.

[0340] For example, the processor 102 may perform the first sensing based on at least one first sensing beam. In this case, the at least one first sensing beam may be a beam covering multiple Tx beams. One first sensing beam may cover all multiple Tx beams, or multiple first sensing beams may cover corresponding Tx beams respectively.

[0341] In addition, the first sensing may be performed based on at least one of [Proposed Method #1] to [Proposed Method #3].

[0342] When it is determined that at least one of the multiple Tx beams is idle in the first sensing, the processor 102 may perform the second sensing based on the at least one second sensing beam. In this case, the at least one second sensing beam may be a beam covering the multiple Tx beams. One second sensing beam may cover all the multiple Tx beams, or the multiple sensing beams may cover the corresponding Tx beams respectively.

[0343] The second sensing may be performed based on at least one of [Proposed Method #1] to [Proposed Method #3]. Meanwhile, when [Proposed Method #1] is implemented alone or when continuous transmission between CG-PUSCH and DG-PUSCH is allowed in [Proposed Method #3] (for example, when the conditions of [Embodiment #3-1] of [Proposed Method #3] are met), the second sensing may be omitted.

[0344] Based on at least one Tx beam being idle as a result of determination through the first sensing and / or the second sensing, the processor 102 may transmit at least one UL signal corresponding to the Tx beam determined to be idle through the transceiver 106. In this case, the UL signal transmitted by the processor 102 through the transceiver 106 may be based on at least one of [Proposed Method #1] to [Proposed Method #3].

[0345] In addition, the processor 102 may determine at least one Rx beam for receiving at least one DL signal through at least one Tx beam. The processor 102 may receive at least one DL signal transmitted based on at least one of [Method #1] to [Method #3] through at least one Rx beam.

[0346] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may further 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 flow charts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then send 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 106, 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 part or all of the processes controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods and / or operational flow charts 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 send and / or receive wireless signals through 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.

[0347] Specifically, instructions and / or operations controlled by the processor 202 of the second wireless device 200 and stored in the memory 204 of the second wireless device 200 according to an embodiment of the present disclosure will be described.

[0348] Although the following operations are described based on the control operations of the processor 202 in terms of the processor 202, software codes for performing such operations may be stored in the memory 204. For example, in the present disclosure, at least one memory 204 may be a computer-readable storage medium and may store instructions or programs. The instructions or programs, when executed, may enable at least one processor operably connected to at least one memory to perform operations related to the following operations according to an embodiment or implementation of the present disclosure.

[0349] For example, the processor 202 may perform the first sensing based on at least one first sensing beam. In this case, the at least one first sensing beam may be a beam covering multiple Tx beams. One first sensing beam may cover all multiple Tx beams, or multiple first sensing beams may cover corresponding Tx beams respectively.

[0350] In addition, the first sensing may be performed based on at least one of [Proposed Method #1] and [Proposed Method #2].

[0351] When it is determined that at least one of the multiple Tx beams is idle in the first sensing, the processor 202 may perform the second sensing based on at least one second sensing beam. In this case, the at least one second sensing beam may be a beam covering multiple Tx beams. One second sensing beam may cover all multiple Tx beams, or multiple sensing beams may cover corresponding Tx beams respectively.

[0352] The second sensing may be performed based on at least one of [Proposed Method #1] and [Proposed Method #2]. Meanwhile, when [Proposed Method #1] is implemented alone, performing the second sensing may be omitted.

[0353] Based on at least one Tx beam being idle as a result of determination through the first sensing and / or the second sensing, the processor 202 may transmit at least one DL signal corresponding to the Tx beam determined to be idle through the transceiver 206. In this case, the DL signal transmitted by the processor 102 through the transceiver 206 may be based on at least one of [Proposed Method #1] and [Proposed Method #2].

[0354] In addition, the processor 202 may determine at least one Rx beam for receiving at least one UL signal through at least one Tx beam. The processor 202 may receive at least one UL signal transmitted based on at least one of [Method #1] and [Method #2] through at least one Rx beam.

[0355] Now, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202. For example, 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)). 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 flow charts disclosed in this document. 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 flow charts disclosed in this document and provide the messages, control information, data, or information to 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, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flow charts 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 description, functions, procedures, proposals, methods, and / or operational flow charts disclosed in this document.

[0356] 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 executed by 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 in the form of code, instructions, and / or instruction sets.

[0357] One or more memories 104 and 204 may 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 may 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 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0358] One or more transceivers 106 and 206 may send user data, control information, and / or wireless signals / channels mentioned in the methods and / or operational flow charts 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 mentioned in the description, descriptions, functions, processes, proposals, methods, and / or operational flow charts 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 send and receive wireless signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 send user data, control information, or wireless signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 can 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 send and receive user data, control information, and / or wireless signals / channels mentioned in the descriptions, functions, processes, and suggestions 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, etc. from RF band signals to baseband signals so as to process 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, 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 transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0359] Fig.16 The diagram is applied to a vehicle or an autonomous vehicle of the present disclosure. The vehicle or the autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0360] refer to Fig.16 The vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110.

[0361] The communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or autonomous driving vehicle 100. The control unit 120 may include an ECU. The drive unit 140a may enable the vehicle or autonomous driving vehicle 100 to drive on a road. The drive unit 140a may include an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous driving vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may obtain information about vehicle status information, surrounding environment information, user information, etc. The sensor unit 140c 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 position 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 140d may implement a technology for maintaining a lane on which the vehicle is driving, a technology for automatically adjusting a speed such as an adaptive cruise control, a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path if a destination is set, and the like.

[0362] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 may obtain the latest traffic information data from an external server irregularly / irregularly, and may obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c may obtain information about vehicle state information and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving route, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0363] The embodiments of the present disclosure described below are combinations of elements and features of the present disclosure. Unless otherwise stated, these elements or features may be considered as selective. Each element or feature may be practiced without being combined with other elements or features. In addition, the embodiments of the present disclosure may be constructed by combining a part of elements and / or features. The order of operations described in the embodiments of the present disclosure may be rearranged. Some constructions of any one embodiment may be included in another embodiment and may be replaced by the corresponding constructions of another embodiment. It will be apparent to those skilled in the art that claims that are not explicitly referenced to each other in the attached claims may be presented in combination as embodiments of the present disclosure, or may be included as new claims by subsequent amendments after the application is submitted.

[0364] In the present disclosure, in some cases, a specific operation described as being performed by a BS may be performed by an upper node of the BS. That is, it is apparent that in a network consisting of a plurality of network nodes including a BS, various operations performed for communication with an MS may be performed by the BS or network nodes other than the BS. The term "BS" may be replaced with the term "fixed station", "Node B", "enhanced Node B (eNodeB or eNB)", "access point", etc.

[0365] Those skilled in the art will appreciate that the present disclosure can be performed in other specific ways different from the ways set forth herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above embodiments are 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, rather than by the above description, and all changes falling within the meaning and equivalent range of the appended claims should be included therein.

[0366] Industrial Applicability

[0367] Although the above-mentioned method of transmitting and receiving a signal in an unlicensed band and the apparatus thereof have been described based on an example applied to a 5G NR system, the method and apparatus are applicable to various wireless communication systems in addition to the 5G NR system.

Claims

1. A method for performing uplink (UL) transmission by a user equipment (UE) in a wireless communication system, the method comprising: performing a first type of sensing on the beams, wherein each of the beams is independently sensed; performing the UL transmission through the beam sensed as idle, wherein random backoff counter values ​​for the first type of sensing are set independently of each other, The performing of the UL transmission further includes: Based on (i) a first beam among the beams being sensed as idle based on the first type sensing before a transmission time of the UL transmission corresponding to the first beam, and (ii) the UL transmission has not been performed after the first type sensing: performing a second type of sensing on the first beam during a duration immediately preceding the transmission time, wherein the random backoff counter value is not used for the second type of sensing; performing the UL transmission based on the first beam being sensed as idle based on the second type sensing; and Based on the first beam being sensed as busy based on the second type of sensing, the first type of sensing is performed on the first beam.

2. The method according to claim 1, wherein: A first type of sensing of the beams is performed simultaneously.

3. The method according to claim 1, wherein: Each of the beams corresponds to a UL transmission among a plurality of UL transmissions, and Wherein, the UL transmission is scheduled simultaneously.

4. A user equipment UE for performing uplink (UL) transmission in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising: performing a first type of sensing on the beam, wherein each of the beams is sensed independently; performing, via the at least one transceiver, the UL transmission through the beam sensed as idle, wherein random backoff counter values ​​for the first type of sensing are set independently of each other, The performing of the UL transmission further includes: Based on (i) a first beam among the beams being sensed as idle based on the first type sensing before a transmission time of the UL transmission corresponding to the first beam, and (ii) the UL transmission has not been performed after the first type sensing: performing a second type of sensing on the first beam during a duration immediately preceding the transmission time, wherein the random backoff counter value is not used for the second type of sensing; performing the UL transmission based on the first beam being sensed as idle based on the second type sensing; and Based on the first beam being sensed as busy based on the second type of sensing, the first type of sensing is performed on the first beam.

5. The UE according to claim 4, wherein: The first type of sensing of the beam is performed simultaneously.

6. The UE according to claim 4, wherein: Each beam of the plurality of beams corresponds to a UL transmission among a plurality of UL transmissions, and Wherein, the multiple UL transmissions are scheduled simultaneously.

7. An apparatus for performing uplink (UL) transmission in a wireless communication system, the apparatus comprising: at least one processor; as well as at least one memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising: performing a first type of sensing on the beam, wherein each of the beams is sensed independently; performing the UL transmission through the beam sensed as idle, wherein random backoff counter values ​​for the first type of sensing are set independently of each other, The performing of the UL transmission further includes: Based on (i) a first beam among the beams being sensed as idle based on the first type sensing before a transmission time of the UL transmission corresponding to the first beam, and (ii) the UL transmission has not been performed after the first type sensing: performing a second type of sensing on the first beam during a duration immediately preceding the transmission time, wherein the random backoff counter value is not used for the second type of sensing; performing the UL transmission based on the first beam being sensed as idle based on the second type sensing; and Based on the first beam being sensed as busy based on the second type of sensing, the first type of sensing is performed on the first beam.

8. A computer-readable storage medium, the computer-readable storage medium comprising at least one computer program, the at least one computer program causing at least one processor to perform operations comprising: performing a first type of sensing on the beam, wherein each of the beams is sensed independently; performing uplink (UL) transmission through the beam sensed as idle, wherein random backoff counter values ​​for the first type of sensing are set independently of each other, The performing of the UL transmission further includes: Based on (i) a first beam among the beams being sensed as idle based on the first type sensing before a transmission time of the UL transmission corresponding to the first beam, and (ii) the UL transmission has not been performed after the first type sensing: performing a second type of sensing on the first beam during a duration immediately preceding the transmission time, wherein the random backoff counter value is not used for the second type of sensing; performing the UL transmission based on the first beam being sensed as idle based on the second type sensing; and Based on the first beam being sensed as busy based on the second type of sensing, the first type of sensing is performed on the first beam.

9. A method for performing downlink (DL) transmission by a base station (BS) in a wireless communication system, the method comprising: performing a first type of sensing on the beam, wherein each of the beams is sensed independently; performing the DL transmission through the beam sensed as idle, wherein random backoff counter values ​​for the first type of sensing are set independently of each other, The performing of the DL transmission further comprises: Based on (i) a first beam among the beams being sensed as idle based on the first type sensing before a transmission time of the DL transmission corresponding to the first beam, and (ii) the DL transmission has not been performed after the first type sensing: performing a second type of sensing on the first beam during a duration immediately preceding the transmission time, wherein the random backoff counter value is not used for the second type of sensing; performing the DL transmission based on the first beam being sensed as idle based on the second type sensing; and Based on the first beam being sensed as busy based on the second type of sensing, the first type of sensing is performed on the first beam.

10. A base station BS for performing downlink DL transmission in a wireless communication system, the BS comprising: at least one transceiver; at least one processor; as well as at least one memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising: performing a first type of sensing on the beam, wherein each of the beams is sensed independently; performing, via the at least one transceiver, the DL transmission through the beam sensed as idle, wherein random backoff counter values ​​for the first type of sensing are set independently of each other, The performing of the DL transmission further comprises: Based on (i) a first beam among the beams being sensed as idle based on the first type sensing before a transmission time of the DL transmission corresponding to the first beam, and (ii) the DL transmission has not been performed after the first type sensing: performing a second type of sensing on the first beam during a duration immediately preceding the transmission time, wherein the random backoff counter value is not used for the second type of sensing; performing the DL transmission based on the first beam being sensed as idle based on the second type sensing; and Based on the first beam being sensed as busy based on the second type of sensing, the first type of sensing is performed on the first beam.

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