Channel sensing method and apparatus for side link transmission bursts in license-free bands

Abstract

A method of operating a first device 100 in a wireless communication system is proposed. The method may include selecting a plurality of resources for performing a burst transmission including a plurality of transmissions, determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, performing a first channel sensing on an initial resource among the plurality of resources, and performing the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system.

Background Art

[0002] Sidelink (SL) means a communication method in which a direct link is set between terminals (User Equipment, UE), and voice or data, etc. are directly exchanged between the terminals without passing through a base station (Base Station, BS). SL is considered as one solution to solve the burden on the base station due to rapidly increasing data traffic. Vehicle-to-everything (V2X) means a communication technology in which information is exchanged with other vehicles, pedestrians, and things with built-in infrastructure via wired / wireless communication. V2X can be classified into four types such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2X communication can be provided via the PC5 interface and / or the Uu interface.

[0003] On the other hand, as more and more communication devices require a larger communication capacity, the need for mobile broadband communication improved compared to existing radio access technologies (RAT) has emerged. As a result, communication systems considering services or terminals sensitive to reliability and latency have been discussed, and next-generation wireless connection technologies considering improved mobile broadband communication, massive machine type communication (mMTC), ultra-reliable and low-latency communication (URLLC), etc. can be referred to as a new radio access technology (new RAT) or new radio (NR).

Summary of the Invention

Means for Solving the Problems

[0004] According to an embodiment of the present disclosure, a method for a first device to perform wireless communication is provided. For example, the method may include selecting a plurality of resources for performing a burst transmission including a plurality of transmissions, determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, performing a first channel sensing on an initial resource among the plurality of resources, and performing the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0005] According to an embodiment of the present disclosure, a first device for performing wireless communication is provided. For example, the first device may include at least one transceiver, at least one processor, and at least one memory connected to be executable by the at least one processor and storing instructions for performing operations on the first device based on being executed by the at least one processor. For example, the operations may include selecting a plurality of resources for performing a burst transmission including a plurality of transmissions, determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, performing a first channel sensing on an initial resource among the plurality of resources, and performing the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0006] According to an embodiment of the present disclosure, an apparatus configured to control a first terminal is provided. For example, the apparatus may include at least one processor and at least one memory connected to be executable by the at least one processor and storing instructions to perform operations on the first terminal based on being executed by the at least one processor. For example, the operations may include selecting a plurality of resources for performing a burst transmission including a plurality of transmissions, determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, performing a first channel sensing on an initial resource among the plurality of resources, and performing the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0007] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions is provided. For example, when executed, the instructions may cause a first device to select a plurality of resources for performing a burst transmission including a plurality of transmissions, determine a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, perform a first channel sensing on an initial resource among the plurality of resources, and perform the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0008] According to an embodiment of the present disclosure, a method for a second device to perform wireless communication is provided. For example, the method may include receiving a burst transmission based on a plurality of resources from a first device. For example, the burst transmission includes a plurality of transmissions, and the burst transmission is transmitted based on the result of a first channel sensing for an initial resource among the plurality of resources being IDLE, and the length of a channel sensing window for performing channel sensing for the plurality of transmissions is determined based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions.

[0009] According to an embodiment of the present disclosure, a second device for performing wireless communication is provided. For example, it may include at least one transceiver, at least one processor, and at least one memory connected to be executable by the at least one processor and storing instructions for executing operations on the second device based on being executed by the at least one processor. For example, the operations include receiving a burst transmission based on a plurality of resources from a first device, where the burst transmission includes a plurality of transmissions, the burst transmission is transmitted based on the result of a first channel sensing for an initial resource among the plurality of resources being IDLE, and the length of a channel sensing window for performing channel sensing for the plurality of transmissions is determined based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

DETAILED DESCRIPTION OF THE INVENTION

[0011] In this specification, "A or B" can mean "only A", "only B", or "both A and B". Also, in this specification, "A or B" can be interpreted as "A and / or B". For example, in this specification, "A, B or C" can mean "only A", "only B", "only C", or "any combination of A, B and C".

[0012] The slashes ( / ) and commas used in this specification can mean "and / or". For example, "A / B" can mean "A and / or B". Accordingly, "A / B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B or C".

[0013] In this specification, "at least one of A and B" can mean "only A", "only B", or "both A and B". Also, in this specification, expressions such as "at least one of A or B" and "at least one of A and / or B" can be interpreted in the same way as "at least one of A and B".

[0014] Also, in this specification, "at least one of A, B, and C" can mean "only A", "only B", "only C", or "any combination of A, B, and C". Also, "at least one of A, B, or C" and "at least one of A, B, and / or C" can mean "at least one of A, B, and C".

[0015] Also, the parentheses used in this specification can mean "for example". Specifically, when shown as "control information (PDCCH)", "PDCCH" is proposed as an example of "control information". Also, "control information" in this specification is not limited to "PDCCH", and "PDCCH" is proposed as an example of "control information". Also, when shown as "control information (i.e., PDCCH)", "PDCCH" is proposed as an example of "control information".

[0016] In the following description, "when, if, in case of" may be replaced with "based on".

[0017] In this specification, the technical features individually described within one drawing can be implemented individually or simultaneously.

[0018] In this specification, a higher layer parameter can be a parameter that is set for a terminal, set in advance, or predefined. For example, a base station or network can transmit a higher layer parameter to a terminal. For example, the higher layer parameter can be transmitted via RRC (radio resource control) signaling or MAC (medium access control) signaling.

[0019] The following technologies can be used in various wireless communication systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) and CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, E-UTRA (evolved UTRA). IEEE802.16m is an evolution of IEEE802.16e and provides backward compatibility with systems based on IEEE802.16e. UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (registered trademark) (3rd generation partnership project) LTE (long term evolution) is part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTS terrestrial radio access), adopting OFDMA in the downlink and SC-FDMA in the uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

[0020] 5G NR is a successor technology to LTE-A and is a new Clean-slate form of mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low-frequency bands below 1 GHz, intermediate-frequency bands from 1 GHz to 10 GHz, and high-frequency (millimeter-wave) bands above 24 GHz.

[0021] The 6G (wireless communication) system aims to achieve (i) very high data speeds per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption for battery-free IoT devices, (vi) ultra-high-reliability connections, (vii) connected intelligence with machine learning capabilities, etc. The vision of the 6G system consists of four aspects such as intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can meet the requirements as shown in Table 1 below. That is, Table 1 shows an example of the requirements of the 6G system.

[0022]

Table 1

[0023] The 6G system has key factors such as eMBB (Enhanced mobile broadband), URLLC (Ultra-reliable low latency communications), mMTC (massive machine-type communication), AI integrated communication, Tactile internet, High throughput, High network capacity, High energy efficiency, Low backhaul and access network congestion, and Enhanced data security.

[0024] Figure 1 shows a communication structure that can be provided in a 6G system according to an embodiment of the present disclosure. The example of Figure 1 can be combined with various embodiments of the present disclosure.

[0025] The 6G system is expected to have 50 times higher simultaneous wireless communication connectivity than the 5G wireless communication system. URLLC, a key feature of 5G, can become a more major technology by providing an end-to-end delay of less than 1 ms in 6G communication. The 6G system may be far superior in volume spectral efficiency, unlike the frequently used area spectral efficiency. The 6G system can provide a very long battery life and advanced battery technology for energy harvesting, and mobile devices in the 6G system do not need to be charged separately. The new network characteristics in 6G are as follows.

[0026] - Satellites integrated network: 6G is expected to be integrated with satellites to provide a global mobile population. Integrating terrestrial, satellite, and public networks in one wireless communication system is very important in 6G.

[0027] - Connected intelligence: Different from previous-generation wireless communication systems, 6G is innovative and updated as the evolution of wireless from "connected things" to "connected intelligence". AI can be applied at each step of the communication procedure (or each step of signal processing described below).

[0028] - Seamless integration of wireless information and energy transfer: The 6G wireless network transmits power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transmission (WIET) may be integrated.

[0029] - Ubiquitous super 3D connectivity: Connectivity to the networks and core network functions of drones and very low Earth orbit satellites creates super 3D connectivity in 6G ubiquity.

[0030] Among the characteristics of the new 6G network as described above, several common requirements are as follows.

[0031] - Small cell networks: The idea of small cell networks was introduced in cellular systems to improve the quality of received signals as a result of improving throughput, energy efficiency, and spectral efficiency. As a result, small cell networks are an essential characteristic of 5G and communication systems beyond 5G (5GB) and above. Therefore, the 6G communication system also adopts the characteristics of small cell networks.

[0032] - Ultra-dense heterogeneous network: Ultra-dense heterogeneous network may become another important feature of 6G communication systems. The multi-layer network composed of heterogeneous networks improves the overall QoS and reduces costs.

[0033] - High-capacity backhaul: Backhaul connections are characterized as high-capacity backhaul networks to support high-volume traffic. High-speed optical fibers and free-space optical communication (FSO) systems could be possible solutions to that problem.

[0034] - Radar technology integrated with mobile technology: Precise localization (or location-based services) via communication is one of the functions of 6G wireless communication systems. Therefore, radar systems may be integrated with 6G networks.

[0035] - Softwarization and virtualization: Softwarization and virtualization are two important functions that underlie the design process in 5G networks to ensure flexibility, reconfigurability, and programmability. Also, billions of devices can be shared in a shared physical infrastructure.

[0036] In what follows, the core implementation technologies of 6G systems will be described.

[0037] - Artificial Intelligence: The most important for the 6G system, and the newly introduced technology is AI. AI was not involved in the 4G system. The 5G system supports AI partially or very limitedly. However, the 6G system is fully supported by AI for full automation. The development of machine learning creates a more intelligent network for real-time communication in 6G. Introducing AI into communication simplifies and improves real-time data transmission. AI can use numerous analyses to determine how complex target operations are executed. That is, AI can enhance efficiency and reduce processing latency. Time-consuming operations such as handover, network selection, and resource scheduling can be executed immediately by using AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine communications. Also, AI enables fast communication in BCI (Brain Computer Interface). The AI-based communication system is supported by meta-materials, intelligent structures, intelligent networks, intelligent devices, intelligent radios, self-sustaining wireless networks, and machine learning.

[0038] - Terahertz Communication: The data transmission rate can be increased by increasing the bandwidth. This can be achieved by applying advanced large-scale MIMO technology using a wide bandwidth for sub-THz communication. THz waves, also known as radiation below millimeter, typically exhibit a frequency band between 0.1 THz and 10 THz with corresponding wavelengths in the range of 0.03 mm - 3 mm. The 100 GHz - 300 GHz band range (Sub THz band) is regarded as the main part of the THz band for cellular communication. Adding the Sub-THz band to the mmWave band increases the 6G cellular communication capacity. Among the defined THz bands, 300 GHz - 3 THz is in the far-infrared (IR) frequency band. The 300 GHz - 3 THz band is part of the wideband but at the boundary of the wideband and right after the RF band. Therefore, this 300 GHz - 3 THz band is similar to RF. Figure 2 shows the electromagnetic spectrum according to an embodiment of the present disclosure. The example in Figure 2 can be combined with various embodiments of the present disclosure. The main characteristics of THz communication include (i) a bandwidth that can be used in a wide range to support a very high data transmission rate, and (ii) high path loss occurring at high frequencies (highly directional antennas are essential). The narrow beamwidth generated in highly directional antennas reduces interference. The small wavelength of THz signals enables a larger number of antenna elements to be integrated into devices and BS operating in this band. Advanced adaptive array technologies can be used to overcome range limitations through this.

[0039] - Large-scale MIMO technology

[0040] - Hologram Beam forming (HBF)

[0041] - Optical wireless technology

[0042] - Free Space Optical (FSO) Backhaul Network

[0043] - Non-Terrestrial Networks (NTN)

[0044] - Quantum Communication

[0045] - Cell-free Communication

[0046] - Integration of Wireless Information and Power Transmission

[0047] - Integration of Wireless Communication and Sensing

[0048] - Integrated Access and Backhaul Network

[0049] - Big data Analysis

[0050] - Reconfigurable Intelligent Surface

[0051] - Metaverse

[0052] - Block-chain

[0053] - Unmanned Aerial Vehicle (UAV): UAV (Unmanned Aerial Vehicle) or drone may become an important element in 6G wireless communication. In most cases, high-speed data wireless connection is provided using UAV technology. The BS entity is installed on the UAV to provide cellular connection. UAV has specific functions not seen in fixed BS infrastructure such as easy deployment, strong line-of-sight links, and a degree of freedom in which mobility is controlled. During emergencies such as natural disasters, the deployment of terrestrial communication infrastructure is not economically feasible and sometimes cannot provide services in a volatile environment. UAV can easily handle such situations. UAV may become a new paradigm in the field of wireless communication. This technology facilitates the three basic requirements of wireless networks, namely eMBB, URLLC, and mMTC. UAV can also support various purposes such as improving network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, accident monitoring, etc. Therefore, UAV technology is recognized as one of the most important technologies for 6G communication.

[0054] - Autonomous Driving: For perfect autonomous driving, it is necessary to notify each other of dangerous situations through vehicle-to-vehicle communication or to confirm information such as parking information positions and signal change times through communication between infrastructure such as parking lots and signals and vehicles. V2X (Vehicle to Everything), which is a key element in building the autonomous driving infrastructure, is a technology that communicates and shares with various elements on the road for automobiles to drive autonomously, such as wireless communication between vehicles (V2V, Vehicle to vehicle) and wireless communication between vehicles and infrastructure (V2I, Vehicle to Infrastructure). In order to maximize the performance of autonomous driving and ensure high safety, fast transmission speed and low latency technology are essential. Furthermore, in the future, autonomous driving will need to transmit and receive a huge amount of information in order to intervene directly in the operation of the vehicle in dangerous situations by actively intervening in the operation of the vehicle beyond the level of warning and guiding messages to the driver and controlling the vehicle directly. It is expected that 6G will maximize autonomous driving with a faster transmission speed and lower latency than 5G.

[0055] For clarity of explanation, the description is centered on 5G NR, but the technical idea according to an embodiment of the present disclosure is not limited to this. Various examples of the present disclosure can also be applied to a 6G communication system.

[0056] Figure 3 shows the structure of an NR system according to an embodiment of the present disclosure. The embodiment of Figure 3 can be combined with various embodiments of the present disclosure.

[0057] Referring to FIG. 3, the NG-RAN (Next Generation - Radio Access Network) can include a base station 20 that provides protocol termination of the user plane and the control plane to the terminal 10. For example, the base station 20 can include a gNB (next generation - NodeB) and / or an eNB (evolved - NodeB). For example, the terminal 10 can be fixed or have mobility, and is also called by other terms such as MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), MT (Mobile Terminal), Wireless Device, etc. For example, the base station is a fixed station that communicates with the terminal 10, and is also called by other terms such as BTS (Base Transceiver System), Access Point, etc.

[0058] The embodiment of FIG. 3 illustrates the case where only gNBs are included. The base stations 20 can be connected to each other via an Xn interface. The base stations 20 can be connected to a 5th generation core network (5G Core Network: 5GC) via an NG interface. More specifically, the base station 20 can be connected to an AMF (access and mobility management function) 30 via an NG - C interface and can be connected to a UPF (user plane function) 30 via an NG - U interface.

[0059] The layers of the Radio Interface Protocol between the terminal and the network can be classified into L1 (the first layer), L2 (the second layer), and L3 (the third layer) based on the lower three layers of the well-known Open System Interconnection (OSI) reference model in communication systems. Among them, the physical layer belonging to the first layer provides an Information Transfer Service using a Physical Channel, and the RRC (Radio Resource Control) layer located in the third layer performs the role of controlling radio resources between the terminal and the network. For this purpose, the RRC layer exchanges RRC messages between the terminal and the base station.

[0060] Figure 4 shows a radio protocol architecture according to an embodiment of the present disclosure. The embodiment of Figure 4 can be combined with various embodiments of the present disclosure. Specifically, (a) of Figure 4 shows a radio protocol stack of the user plane for Uu communication, and (b) of Figure 4 shows a radio protocol stack of the control plane for Uu communication. (c) of Figure 4 shows a radio protocol stack of the user plane for SL communication, and (d) of Figure 4 shows a radio protocol stack of the control plane for SL communication.

[0061] Referring to Figure 4, the physical layer provides an information transfer service to the upper layer using a physical channel. The physical layer is connected to the upper layer MAC (Medium Access Control) layer via a transport channel. Data moves between the MAC layer and the physical layer via the transport channel. The transport channel is classified according to how data is transmitted and what characteristics it has via a radio interface.

[0062] Between different physical layers, that is, between the physical layers of the transmitter and the receiver, data moves through a physical channel. The physical channel can be modulated by the OFDM (Orthogonal Frequency Division Multiplexing) method and utilizes time and frequency as radio resources.

[0063] The MAC layer provides services to the upper RLC (radio link control) layer via logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. In addition, the MAC layer provides a logical channel multiplexing function by mapping from multiple logical channels to a single transport channel. The MAC sublayer provides a data transfer service on the logical channel.

[0064] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To ensure the various QoS (Quality of Service) required by the Radio Bearer (RB), the RLC layer provides three operating modes: Transparent Mode (Transparent Mode (transmission mode), TM), Unacknowledged Mode, UM, and Acknowledged Mode, AM. AM RLC provides error correction via ARQ (automatic repeat request).

[0065] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. An RB means a logical path provided by the first layer (physical layer or PHY layer) and the second layer (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer, SDAP (Service Data Adaptation Protocol) layer) for data transmission between a terminal and a network.

[0066] The functions of the PDCP layer in the user plane include the transfer of user data, header compression, and ciphering. The functions of the PDCP layer in the control plane include the transfer of control plane data and ciphering / integrity protection.

[0067] The SDAP (Service Data Adaptation Protocol) layer is defined only in the user plane. The SDAP layer performs functions such as mapping between QoS flows and data radio bearers, and marking QoS flow identifiers (IDs) in downlink and uplink packets.

[0068] When an RB is configured, it means the process of defining the characteristics of radio protocol layers and channels to provide a specific service, and setting each specific parameter and operation method. Also, RBs are divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

[0069] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal enters the RRC_CONNECTED state; otherwise, it enters the RRC_IDLE state. In the case of NR, an additional RRC_INACTIVE state is defined, and a terminal in the RRC_INACTIVE state can maintain its connection with the core network while releasing its connection with the base station.

[0070] For the downlink transport channel for transmitting data from the network to the terminal, there are the BCH (Broadcast Channel) for transmitting system information and the downlink SCH (Shared Channel) for transmitting user traffic and control messages other than that. For downlink multicast or broadcast service traffic or control messages, they can also be transmitted via the downlink SCH or via a separate downlink MCH (Multicast Channel). On the other hand, for the uplink transport channel for transmitting data from the terminal to the network, there are the RACH (Random Access Channel) for transmitting initial control messages and the uplink SCH (Shared Channel) for transmitting user traffic and control messages other than that.

[0071] Above the transport channel, among the logical channels mapped to the transport channel, there are the BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic Channel), etc.

[0072] FIG. 5 shows the structure of an NR radio frame according to an embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

[0073] Referring to FIG. 5, in NR, radio frames can be used for uplink and downlink transmissions. The radio frame has a length of 10 ms and can be defined in two 5 ms half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe can be divided into one or more slots, and the number of slots in a subframe can be determined by the subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols by means of a cyclic prefix (CP).

[0074] When normal CP is used, each slot can include 14 symbols. When extended CP is used, each slot can include 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA (Single Carrier-FDMA) symbols (or DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbols).

[0075] The following Table 2 exemplifies the number of symbols per slot (N slot symb ), the number of slots per frame (N frame,u slot ), and the number of slots per subframe (N subframe,u slot ) according to the SCS setting (u) when normal CP or extended CP is used.

[0076]

Table 2

[0077] In the NR system, the OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set differently between a plurality of cells merged into one terminal. Thereby, the (absolute time) intervals of time resources (e.g., subframes, slots or TTIs) (collectively referred to as TUs for convenience) composed of the same number of symbols can be set differently between the merged cells.

[0078] In NR, a number of numerologies or SCSs can be supported to support various 5G services. For example, when the SCS is 15 kHz, a wide area in a traditional cellular band can be supported. When the SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. When the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz can be supported to overcome phase noise.

[0079] The NR frequency band can be defined in two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The numerical values of the frequency ranges can be changed. For example, the two types of frequency ranges are as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean "sub 6GHz range", FR2 can mean "above 6GHz range", and can be called millimeter wave (mmW).

[0080] [Table 3]

[0081] As described above, the numerical values of the frequency range of the NR system can be changed. For example, FR1 can include a band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 can include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included within FR1 can include an unlicensed band. The unlicensed band can be used for various applications, for example, it can be used for communication for vehicles (e.g., autonomous driving).

[0082] [Table 4]

[0083] FIG. 6 shows the slot structure of an NR frame according to an embodiment of the present disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure.

[0084] Referring to FIG. 6, a slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one slot can include 14 symbols, and in the case of extended CP, one slot can include 12 symbols. Or, in the case of normal CP, one slot can include 7 symbols, and in the case of extended CP, one slot can include 6 symbols.

[0085] The carrier wave includes a plurality of sub-carrier waves in the frequency domain. An RB (Resource Block) can be defined as a plurality (e.g., 12) of consecutive sub-carrier waves in the frequency domain. A BWP (Bandwidth Part) can be defined as a plurality of consecutive (P)RBs ((Physical) Resource Blocks) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier wave can include a maximum of N (e.g., 5) BWPs. Data communication can be performed via the activated BWP. Each element is called a resource element (Resource Element, RE) in the resource grid, and one complex symbol can be mapped.

[0086] Hereinafter, the BWP (Bandwidth Part) and the carrier will be described.

[0087] A BWP (Bandwidth Part) is a continuous set of PRBs (physical resource blocks) with a given numerology. A PRB can be selected from a continuous subset of CRBs (common resource blocks) for a given numerology on a given carrier wave.

[0088] For example, the BWP is at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the terminal may not monitor the downlink radio link quality in a DL BWP other than the active DL BWP on the PCell (primary cell). For example, the terminal does not receive a PDCCH, a PDSCH (physical downlink shared channel), or a CSI-RS (reference signal) (except for RRM) outside the active DL BWP. For example, the terminal does not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the terminal does not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside the active UL BWP. For example, when it is downlink, the initial BWP is given as a continuous RB set for the RMSI (remaining minimum system information) CORESET (control resource set) (set by the PBCH (physical broadcast channel)). For example, when it is uplink, the initial BWP is given by the SIB (system information block) for the random access procedure. For example, the default BWP is set by the upper layer. For example, the initial value of the default BWP is the initial DL BWP. For energy saving, when the terminal cannot detect DCI for a certain period of time, the terminal can switch the active BWP of the terminal to the default BWP.

[0089] On one hand, the BWP can be defined for the SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or an SL signal on a specific BWP, and a receiving terminal can receive the SL channel or the SL signal on the specific BWP. For a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have separate configuration signalling from the Uu BWP. For example, a terminal can receive the configuration for the SL BWP from a base station / network. For example, a terminal can receive the configuration for the Uu BWP from a base station / network. The SL BWP can be (pre)configured for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For terminals in the RRC_CONNECTED mode, at least one SL BWP can be activated within a carrier.

[0090] FIG. 7 shows an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 7, it is assumed that there are three BWPs.

[0091] Referring to FIG. 7, a CRB (common resource block) is a carrier resource block numbered from one side end to the other side end of a carrier band. And a PRB is a resource block numbered within each BWP. Point A can indicate a common reference point for a resource block grid.

[0092] The BWP is based on point A, the offset from point A (N start BWP ) and the bandwidth (N size BWP) can be set by. For example, Point A is the external reference point of the PRB of the carrier where Sub - carrier 0 of all numerologies (for example, all numerologies supported by the network in the corresponding carrier) is aligned. For example, the offset is the PRB interval between the lowest sub - carrier of a given numerology and Point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0093] Hereinafter, V2X or SL communication will be described.

[0094] SLSS (Sidelink Synchronization Signal) is a sidelink - specific sequence that can include PSSS (Primary Sidelink Synchronization Signal) and SSSS (Secondary Sidelink Synchronization Signal). The PSSS can be referred to as S - PSS (Sidelink Primary Synchronization Signal), and the SSSS can be referred to as S - SSS (Sidelink Secondary Synchronization Signal). For example, length - 127M - sequences can be used for S - PSS, and length - 127 Gold sequences can be used for S - SSS. For example, a terminal can use S - PSS to detect the first signal and acquire synchronization. For example, a terminal can use S - PSS and S - SSS to acquire detailed synchronization and detect the synchronization signal ID.

[0095] The Physical Sidelink Broadcast Channel (PSBCH) is a (broadcast) channel on which the basic (system) information that a terminal should know first before SL signal transmission and reception is transmitted. For example, the basic information includes information related to SLSS, Duplex Mode (DM), TDD UL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool related information, the type of application related to SLSS, subframe offset, broadcast information, etc. For example, for the evaluation of PSBCH performance, in NR V2X, the payload size of PSBCH is 56 bits including a 24-bit Cyclic Redundancy Check (CRC).

[0096] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., the SLSS (Synchronization Signal) / PSBCH block, hereinafter, the S-SSB (Sidelink-Synchronization Signal Block)). The S-SSB can have the same numerology (i.e., SCS and CP length) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) within the carrier, and the transmission bandwidth is within the (pre-set) SL BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 Resource Blocks (RB). For example, PSBCH spans 11 RB. And the frequency position of the S-SSB can be (pre-set). Therefore, the terminal does not need to perform hypothesis detection by frequency to find the S-SSB in the carrier.

[0097] FIG. 8 shows a procedure in which a terminal executes V2X or SL communication in a transmission mode according to an embodiment of the present disclosure. The embodiment of FIG. 8 can be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode can be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode can be referred to as an LTE transmission mode, and in NR, the transmission mode can be referred to as an NR resource allocation mode.

[0098] For example, FIG. 8(a) shows terminal operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, FIG. 8(a) shows terminal operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0099] For example, FIG. 8(b) shows terminal operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, FIG. 8(b) shows terminal operations related to NR resource allocation mode 2.

[0100] Referring to FIG. 8(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station can schedule SL resources used by the terminal for SL transmission. For example, in step S800, the base station can transmit information related to SL resources and / or information related to UL resources to the first terminal. For example, the UL resources can include PUCCH resources and / or PUSCH resources. For example, the UL resources can be resources for reporting SL HARQ feedback to the base station.

[0101] For example, the first terminal can receive information related to DG (dynamic grant) resources and / or information related to CG (configured grant) resources from the base station. For example, the CG resources can include CG type 1 resources or CG type 2 resources. In this specification, the DG resources can be resources that the base station sets / allocates to the first terminal via DCI (downlink control information). In this specification, the CG resources can be (periodic) resources that the base station sets / allocates to the first terminal via DCI and / or RRC messages. For example, in the case of CG type 1 resources, the base station can send an RRC message including information related to the CG resources to the first terminal. For example, in the case of CG type 2 resources, the base station can send an RRC message including information related to the CG resources to the first terminal, and the base station can send DCI related to the activation or release of the CG resources to the first terminal.

[0102] In step S810, the first terminal can transmit PSCCH (e.g., SCI (Sidelink Control Information) or 1st-stage SCI) to the second terminal based on the resource scheduling. In step S820, the first terminal can transmit PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second terminal. In step S830, the first terminal can receive PSFCH related to PSCCH / PSSCH from the second terminal. For example, HARQ feedback information (e.g., NACK information or ACK information) can be received from the second terminal via the PSFCH. In step S840, the first terminal can transmit / report the HARQ feedback information to the base station via PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station can be information generated based on the HARQ feedback information received by the first terminal from the second terminal. For example, the HARQ feedback information reported to the base station can be information generated by the first terminal based on a pre-set rule. For example, the DCI can be DCI for SL scheduling. For example, the format of the DCI can be DCI format 3_0 or DCI format 3_1.

[0103] Referring to FIG. 8(b), in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal can determine the SL transmission resource within the SL resource set by the base station / network or the preset SL resource. For example, the set SL resource or the preset SL resource can be a resource pool. For example, the terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can select resources by itself within the set resource pool and perform SL communication. For example, the terminal can perform sensing and (re)selection procedures of resources and select resources by itself within the selection window. For example, the sensing can be performed in units of subchannels. For example, in step S810, the first terminal that has selected resources by itself within the resource pool can transmit a PSCCH (e.g., SCI (Sidelink Control Information) or 1 st -stage SCI) to the second terminal using the resources. In step S820, the first terminal can transmit a PSSCH (e.g., 2 nd -stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second terminal. In step S830, the first terminal can receive a PSFCH related to the PSCCH / PSSCH from the second terminal.

[0104] Referring to FIG. 8(a) or (b), for example, the first terminal can transmit an SCI to the second terminal on the PSCCH. Alternatively, for example, the first terminal can transmit two consecutive SCIs (e.g., 2-stage SCI) to the second terminal on the PSCCH and / or PSSCH. In this case, the second terminal can decode two consecutive SCIs (e.g., 2-stage SCI) to receive the PSSCH from the first terminal. In this specification, the SCI transmitted on the PSCCH can be referred to as 1 st SCI, first SCI, 1 st -stage SCI, or 1 st -stage SCI format, and the SCI transmitted on the PSSCH can be 2 nd SCI, second SCI, 2nd -stage SCI or 2 nd -stage SCI format can be referred to. For example, 1 st -stage SCI format can include SCI format 1-A, and 2 nd -stage SCI format can include SCI format 2-A and / or SCI format 2-B.

[0105] Referring to FIG. 8 (a) or (b), in step S830, the first terminal can receive PSFCH. For example, the first terminal and the second terminal can determine the PSFCH resource, and the second terminal can use the PSFCH resource to send HARQ feedback to the first terminal.

[0106] Referring to FIG. 8 (a), in step S840, the first terminal can send SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0107] FIG. 9 shows three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure. Specifically, FIG. 9 (a) shows broadcast type SL communication, FIG. 9 (b) shows unicast type SL communication, and FIG. 9 (c) shows groupcast type SL communication. In the case of unicast type SL communication, the terminal can perform one-to-one communication with other terminals. In the case of groupcast type SL communication, the terminal can perform SL communication with one or more terminals within the group to which it belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0108] FIG. 10 shows an example of burst resources according to an embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0109] Referring to FIG. 10, the UE can select / determine a plurality of resources. For example, the UE can select / determine a plurality of resources within a resource pool. For example, the plurality of resources may be contiguous resources in the time domain. For example, the plurality of resources may be resources having a time interval (e.g., slot interval) within a threshold in the time domain.

[0110] FIG. 11 shows an example of burst resources according to an embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0111] Referring to FIG. 11, the UE can select / determine a plurality of resources. For example, the UE can select / determine a plurality of resources within a resource pool. For example, the plurality of resources may be contiguous resources in the frequency domain. For example, the plurality of resources may be resources having a frequency interval (e.g., RB interval or sub-channel interval) within a threshold in the frequency domain.

[0112] On the other hand, in NR V2X, SL communication needs to be performed based on clustered resources (e.g., burst resources). For example, the clustered resources may be a set of continuous resources (e.g., a set of continuous resources in the time domain and / or frequency domain). For example, the clustered resources may be a set of resources having an interval within a threshold (e.g., a set of resources separated within a threshold in the time domain and / or frequency domain). Hereinafter, the reason why cluster resource-based SL communication is necessary in NR V2X will be specifically described.

[0113] For example, unlike LTE V2X, aperiodic transmission is supported in NR V2X. Compared with periodic transmission, aperiodic transmission is more likely to fail in transmission due to channel congestion or the like within the PDB (packet delay budget) of the packet from the time of packet generation. Therefore, the UE can select cluster resources for aperiodic transmission and perform burst transmission, through which the success probability of transmission can be maximized within the PDB.

[0114] For example, unlike LTE V2X, packets with strict delay requirements need to be transmitted in NR V2X. Table 5 shows the mapping between Standardized PQI and QoS characteristics.

[0115]

Table 5

[0116] Referring to Table 5, the PDB corresponding to PQI 91 is 3 ms. In this case, in the case of 15 kHz, the UE needs to transmit the corresponding packet within 3 slots. If cluster resources are not supported, the UE can transmit the packet corresponding to PQI 91 using only 1 slot, and if the transmission fails, the retransmission opportunity of the UE may not be guaranteed. However, if cluster transmission is supported, the UE can transmit the packet corresponding to PQI 91 using 3 slots continuously, through which the transmission success probability increases. For the sake of convenience of explanation, it is explained based on PQI 91, but the same problem may occur for packets with strict delay requirements such as PQI 55 and PQI 21.

[0117] On the other hand, cluster resource selection / reservation may be necessary to reduce the power consumption of the UE. For example, a UE that performs partial sensing or random resource selection (e.g., a power-saving UE) can perform full sensing (hereinafter referred to as STS (short-term sensing)) during a short time interval before the selected transmission resource time to avoid resource collisions due to aperiodic transmission. For example, since STS is performed before each selected transmission resource, if the selected resources are far apart in time, the power consumption of the UE due to STS may increase.

[0118] FIG. 12 is a drawing for explaining the reason why burst resource reservation is necessary.

[0119] Referring to FIG. 12(a), when three resources are far apart in time, in order to avoid resource collisions due to aperiodic transmission, the UE needs to perform STS for each of the three resources. In this case, the power consumption of the UE may increase due to three STSs.

[0120] For example, in order to minimize the power consumption of the UE due to such STS, when the UE selects resources based on partial sensing or random selection, the UE can select resources adjacent to each other within the resource selection window. Referring to FIG. 12(b), the UE can select three adjacent resources within the resource selection window. In this case, the UE can perform STS once for the three resources to avoid resource collisions due to aperiodic transmission. Therefore, the power consumption of the UE can be saved.

[0121] For the above reasons, in order to reduce the power consumption of the UE, ensure the reliability of SL communication, and improve the efficiency of resource use, cluster resource-based SL transmission needs to be permitted.

[0122] On the other hand, in the conventional NR-U (unlicensed spectrum), it supports the communication method between the terminal and the base station in the unlicensed band. Also, in Rel-18, it is planned to support a mechanism that can support communication between sidelink terminals in the unlicensed band.

[0123] In the present disclosure, a channel can be called a frequency-axis resource set that executes LBT (Listen-Before-Talk). In NR-U, a channel means a 20MHz LBT bandwidth and has the same meaning as an RB set. For example, the RB set is defined in Section 7 of 3GPP TS38.214 V17.0.0.

[0124] In the present disclosure, CO (channel occupancy) means the time / frequency-axis resource acquired by the base station or the terminal after successful LBT.

[0125] In the present disclosure, COT (channel occupancy time) means the time-axis resource acquired by the base station or the terminal after successful LBT. It is shared between the base station (or terminal) that has acquired CO and the terminal (or base station), and this can be called COT sharing. Depending on the initiating device, this can be called gNB-initiated COT or UE-initiated COT.

[0126] Hereinafter, a wireless communication system that supports the unlicensed band (Unlicensed band / Shared spectrum) will be described.

[0127] FIG. 13 shows an example of a wireless communication system that supports the unlicensed band according to an embodiment of the present disclosure. For example, FIG. 13 can include an NR-U (unlicensed spectrum) wireless communication system. The example of FIG. 13 can be combined with various embodiments of the present disclosure.

[0128] In the following description, a cell operating in the licensed band (hereinafter, L-band) can be defined as an LCell, and a carrier of the LCell can be defined as (DL / UL / SL)LCC. Also, a cell operating in the unlicensed band (hereinafter, U-band) can be defined as a UCell, and a carrier of the UCell can be defined as (DL / UL / SL)UCC. A carrier / carrier-frequency of a cell means the operating frequency of the cell (e.g., the center frequency). A cell / carrier (e.g., CC) is commonly referred to as a cell.

[0129] When the terminal and the base station transmit and receive signals via LCC and UCC in which the carrier is coupled as shown in FIG. 13(a), the LCC is set as the PCC (Primary CC) and the UCC is set as the SCC (Secondary CC). As shown in FIG. 13(b), the terminal and the base station can transmit and receive signals via one UCC or a plurality of carrier-coupled UCCs. That is, the terminal and the base station can transmit and receive signals via only UCC(s) without LCC. For stand-alone operation, PRACH, PUCCH, PUSCH, SRS transmission, etc. are supported in the UCell.

[0130] In the embodiment of FIG. 13, the base station can be replaced by the terminal. In this case, for example, PSCCH, PSSCH, PSFCH, S-SSB transmission, etc. are supported in the UCell.

[0131] Unless otherwise mentioned, the following definitions can be applied to the terms used in this specification.

[0132] - Channel: It is composed of consecutive RBs in which a channel connection procedure is executed in a shared spectrum, and can refer to a carrier or a part of a carrier.

[0133] -Channel access procedure (CAP): This refers to a procedure for evaluating channel availability based on sensing to determine whether other communication nodes can use the channel before transmitting a signal. The basic unit for sensing is T sl The sensing slot has a duration of 9 us. The base station or the terminal senses the channel during the sensing slot and detects that the power detected for at least 4 us in the sensing slot is equal to or exceeds the energy detection threshold X Thresh If it is smaller, the sensing slot period T sl is considered to be inactive. Otherwise, the sensing slot period T sl =9us is considered busy. CAP can be called LBT (Listen-Before-Talk).

[0134] -Channel occupancy: refers to the corresponding transmission(s) on the channel(s) by the base station / terminal after performing a channel access procedure.

[0135] -Channel occupancy time (COT): After a base station / terminal performs a channel access procedure, the base station / terminal and any base station / terminal sharing the channel occupancy can transmit on the channel. When determining COT, if the transmission gap is 25us or less, the gap period is also counted in COT. COT can be shared for transmission between the base station and the corresponding terminal(s).

[0136] - DL transmission burst: Defined as a set of transmissions from a base station that does not have a gap of more than 16us. Transmissions from a base station separated by a gap of more than 16us are considered separate DL transmission bursts. The base station can perform transmissions after the gap without sensing channel availability within the DL transmission burst.

[0137] -UL or SL transmission burst: Defined as a set of transmissions from a terminal with no gap exceeding 16 us. Transmissions from a terminal separated by a gap exceeding 16 us are considered separate UL or SL transmission bursts. The terminal can perform transmission(s) after the gap without sensing channel availability within the UL or SL transmission burst.

[0138] - Discovery burst: Refers to a DL transmission burst that is limited within a (time) window and related to the duty cycle, and includes a set of signal(s) and / or channel(s). In an LTE-based system, the discovery burst is a transmission(s) initiated by a base station and includes PSS, SSS, and CRS (cell-specific RS), and can further include non-zero power CSI-RS. In an NR-based system, the discovery burst is a transmission(s) initiated by a base station and includes at least an SS / PBCH block, and can further include a CORESET for PDCCH that schedules a PDSCH carrying SIB1, a PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0139] Figure 14 shows a method of occupying resources within an unlicensed band according to an embodiment of the present disclosure. The example of Figure 14 can be combined with various embodiments of the present disclosure.

[0140] Referring to FIG. 14, a communication node (e.g., a base station, a terminal) within the unlicensed band needs to determine whether other communication node(s) can use the channel before signal transmission. For this purpose, the communication node within the unlicensed band can execute a channel connection procedure (CAP) to connect to the channel(s) on which the transmission(s) will be executed. The channel connection procedure can be executed based on sensing. For example, the communication node can first perform CS (Carrier Sensing) before signal transmission to check whether other communication node(s) will perform signal transmission. The case where it is determined that other communication node(s) will not perform signal transmission is defined as the case where CCA (Clear Channel Assessment) is confirmed. When there is a CCA threshold (e.g., X Thresh ) that has been defined or set by the upper layer (e.g., RRC), if the communication node detects energy higher than the CCA threshold in the channel, it can determine the channel state as busy, and otherwise, it can determine the channel state as idle. If the channel state is determined to be idle, the communication node can start signal transmission in the unlicensed band. CAP can be replaced by LBT.

[0141] Table 6 illustrates the channel connection procedure (CAP) supported in NR-U.

[0142]

Table 6

[0143] Referring to Table 6, LBT types or CAPs for DL / UL / SL transmissions are defined. However, Table 6 is merely an example, and new types or CAPs may be defined in a similar manner. For example, Type 1 (also referred to as Cat-4 LBT) can be a random back-off based channel access procedure. For example, in the case of Cat-4, the contention window may change. For example, Type 2 can be performed in case of COT sharing within COT acquired by gNB or UE.

[0144] In the following, LBT-SB (SubBand) (or, RB set) will be described.

[0145] One cell (or, carrier (e.g., CC)) or BWP configured for a terminal in a wireless communication system supporting unlicensed bands is composed of a wide band having a larger BW (Band Width) compared to existing LTE. However, the BW for which CCA based on an independent LBT operation is required is limited based on regulations, etc. By defining the sub-bands (SBs) for which individual LBT is performed as LBT-SBs, a plurality of LBT-SBs are included within one wide band cell / BWP. The RB set constituting the LBT-SB is set via upper layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, one cell / BWP includes one or more LBT-SBs.

[0146] FIG. 15 shows a case where a plurality of LBT-SBs are included within an unlicensed band according to an embodiment of the present disclosure. The example of FIG. 15 can be combined with various embodiments of the present disclosure.

[0147] Referring to FIG. 15, a plurality of LBT-SBs are included in the BWP of a cell (or carrier wave). The LBT-SB has a bandwidth of, for example, 20 MHz. The LBT-SB is composed of a plurality of consecutive (P)RBs in the frequency domain and can be called a (P)RB set. Although not shown, a guard band (GB) is included between the LBT-SBs. Therefore, the BWP is configured in the form of {LBT-SB#0 (RBset#0) + GB#0 + LBT-SB#1 (RBset#1 + GB#1) +... + LBT-SB#(K-1) (RBset(#K-1))}. For convenience, the LBT-SB / RB index is set / defined to increase when starting from a lower frequency band and going to a higher frequency band.

[0148] In the following, the CAPC (channel access priority class) will be described.

[0149] The CAPC of the MAC CE and the radio bearer is fixed or configurable to operate in FR1:

[0150] - It is fixed as the lowest priority for the padding BSR (buffer status report) and the recommended bit rate MAC CE;

[0151] - It is fixed as the highest priority for SRB0, SRB1, SRB3, and other MAC CEs;

[0152] - It is configured by the base station for SRB2 and the DRB.

[0153] When selecting the CAPC for a DRB, the base station considers the fairness between transmissions with other traffic types while taking into account the 5QIs of all QoS flows multiplexed on the DRB. Table 7 shows which CAPC should be used for the standardized 5QIs, that is, the CAPC to be used for a given QoS flow. For the standardized 5QIs, the CAPC is defined as shown in the following table, and for non-standardized 5QIs, the CAPC that best matches the QoS characteristics should be used.

[0154]

Table 7

[0155] In the following, a downlink signal transmission method via an unlicensed band will be described. For example, the downlink signal transmission method via an unlicensed band can be applied to the sidelink signal transmission method via an unlicensed band.

[0156] The base station can execute one of the following channel access procedures (CAP) for downlink signal transmission in the unlicensed band.

[0157] (1) Type 1 Downlink (DL) CAP method

[0158] In Type 1 DL CAP, the length of the time interval spanned by the sensing slot that is sensed idle before transmission(s) is random. Type 1 DL CAP can be applied to the following transmissions.

[0159] -(i) A unicast PDSCH with user plane data, or (ii) A transmission(s) initiated by the base station that includes a unicast PDSCH with user plane data and a unicast PDCCH that schedules the user plane data, or,

[0160] Transmissions started by a base station that have (i) only discovery bursts, or (ii) discovery bursts multiplexed with non-unicast information.

[0161] FIG. 16 shows a CAP operation for downlink signal transmission via an unlicensed band of a base station according to an embodiment of the present disclosure. The example of FIG. 16 can be combined with various examples of the present disclosure.

[0162] Referring to FIG. 16, the base station senses whether the channel is in a quiescent state during a sensing slot interval of a defer duration T d and then, if the counter N becomes 0, can execute transmission (S134). At this time, the counter N is adjusted by sensing the channel during additional sensing slot interval(s) according to the following procedure:

[0163] Step 1) (S120) Set N = N init where N init is a random value evenly distributed between 0 and CW p . Then move to step 4.

[0164] Step 2) (S140) If it is selected that N>0 and the base station decreases the counter, set N = N - 1.

[0165] Step 3) (S150) Sense the channel during the additional sensing slot interval. At this time, if the additional sensing slot interval is quiescent (Y), move to step 4. Otherwise (N), move to step 5.

[0166] Step 4) (S130) If N = 0 (Y), end the CAP procedure (S132). Otherwise (N), move to step 2.

[0167] Step 5) (S160) An additional defer duration T dIf a busy sensing slot is detected within the additional delay period T d The channel is sensed until all sensing slots in are detected as idle.

[0168] Step 6) (S170) Additional delay period T d If the channel is sensed to be idle during all sensing slot periods (Y), proceed to step 4. If not (N), proceed to step 5.

[0169] Table 8 shows the channel connection priority classes that apply to the CAP. p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes are shown to vary.

[0170] [Table 8]

[0171] Refer to Table 8, the CWS (contention window size) and maximum COT value for each CAPC are defined. For example, T d =T f +m p *T sl It could be.

[0172] Delay period T d is the interval T f (16us)+m p T consecutive sensing slots sl (9us) in that order. T f At the start of the 16us section, the sensing slot section T sl Includes.

[0173] CW min、p <=CW p <=CW max、pIt is CW p is CW p = CW min、p is set to and updated before step 1 based on the HARQ-ACK feedback (e.g., ACK or NACK ratio) for the previous DL burst (e.g., PDSCH) (CW size update). For example, CW p is initialized based on the HARQ-ACK feedback for the previous DL burst, CW min、p either initialized at CW

[0174] (2) Type 2 downlink (DL) CAP method

[0175] In type 2 DL CAP, the length of the time interval spanned by the sensing slots that are sensed idle before transmission(s) is deterministic. Type 2 DL CAP is differentiated into type 2A / 2B / 2C DL CAP.

[0176] Type 2A DL CAP can be applied to the following transmissions. In type 2A DL CAP, the base station can transmit immediately after sensing that the channel is idle for at least the sensing interval T short_dl = 25 us. Here, T short_dl is the interval T f (= 16 us) followed immediately by one sensing slot interval. T f includes the sensing slot at the start of the interval.

[0177] -(i) Transmissions(s) started by the base station that have only a discovery burst or (ii) have a discovery burst multiplexed with non-unicast information, or

[0178] - Transmissions(s) of the base station 25 us after a gap from transmissions(s) by the terminal within the shared channel occupancy.

[0179] Type 2B DL CAP is applicable to transmissions by the base station after a 16 μs gap from transmissions by the terminal within the shared channel occupancy time. In Type 2B DL CAP, the base station can transmit immediately after the channel has been sensed idle for T f = 16 μs. T f includes a sensing slot within the last 9 μs of the interval. Type 2C DL CAP is applicable to transmissions by the base station after a maximum 16 μs gap from transmissions by the terminal within the shared channel occupancy time. In Type 2C DL CAP, the base station does not sense the channel before transmitting.

[0180] Hereinafter, an uplink signal transmission method via an unlicensed band will be described. For example, the uplink signal transmission method via an unlicensed band can be applied to a sidelink signal transmission method via an unlicensed band.

[0181] The terminal executes Type 1 or Type 2 CAP for uplink signal transmission in the unlicensed band. Usually, the terminal can execute the CAP (for example, Type 1 or Type 2) set by the base station for uplink signal transmission. For example, the terminal includes CAP type indication information in a UL grant (for example, DCI format 0_0, 0_1) for scheduling a PUSCH transmission.

[0182] (1) Type 1 uplink (UL) CAP method

[0183] In Type 1 UL CAP, the length of the time interval spanned by the sensing slot that is sensed idle before transmission(s) is random. Type 1 UL CAP can be applied to the next transmission.

[0184] - Scheduling and / or configured PUSCH / SRS transmission(s) from the base station

[0185] - Scheduling and / or configured PUCCH transmission(s) from the base station

[0186] - Transmission(s) related to the RAP (Random Access Procedure)

[0187] FIG. 17 shows a type 1 CAP operation of a terminal for uplink signal transmission according to an embodiment of the present disclosure. The example of FIG. 17 can be combined with various examples of the present disclosure.

[0188] Referring to FIG. 17, the terminal senses whether the channel is in a quiescent state during a sensing slot interval of a delay interval T d and then, if the counter N becomes 0, transmission can be executed (S234). At this time, the counter N is adjusted by sensing the channel during additional sensing slot interval(s) according to the following procedure:

[0189] Step 1) (S220) Set N = N init Here, N init is a random value evenly distributed between 0 and CW p . Next, move to step 4.

[0190] Step 2) (S240) If it is selected that N>0 and the terminal decreases the counter, set N = N - 1.

[0191] Step 3) (S250) Sense the channel during the additional sensing slot interval. At this time, if the additional sensing slot interval is quiescent (Y), move to step 4. Otherwise (N), move to step 5.

[0192] Step 4) (S230) If N = 0 (Y), end the CAP procedure (S232). Otherwise (N), move to step 2.

[0193] Step 5) (S260) Additional delay period T d Sense the channel until a busy sensing slot is detected within the additional delay period T d or all sensing slots within the additional delay period T are detected as idle.

[0194] Step 6) (S270) If the channel is sensed as idle during all sensing slot intervals of the additional delay period T, (Y), move to Step 4. Otherwise (N), move to Step 5. d Move to Step 4 if the channel is sensed as idle during all sensing slot intervals of the additional delay period T (Y); otherwise (N), move to Step 5.

[0195] Table 9 shows that m p , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes applied to the CAP vary depending on the channel connection priority class.

[0196]

Table 9

[0197] Referring to Table 9, the contention window size (CWS) per CAPC, the maximum COT value, etc. are defined. For example, T d = T f + m p * T sl can be.

[0198] The delay period T d is composed of the interval T f (16 us) + m p consecutive sensing slot intervals T sl (9 us) in that order. T f includes the sensing slot interval T sl at the start of the 16 us interval.

[0199] CW min、p <= CW p <= CWmax、p is CW p is CW p = CW min、p is set to and updated prior to step 1 based on explicit / implicit reception responses for previous UL bursts (e.g., PUSCH) (CW size update). For example, CW p is initialized based on explicit / implicit reception responses for previous UL bursts, CW min、p is either initialized to, incremented to the next highest permitted value, or the existing value can be maintained as is.

[0200] (2) Type 2 Uplink (UL) CAP method

[0201] In Type 2 UL CAP, the length of the time interval spanned by the sensing slots that are sensed idle before transmission(s) is deterministic. Type 2 UL CAP is differentiated into Type 2A / 2B / 2C UL CAP. In Type 2A UL CAP, the terminal can transmit immediately after the channel has been sensed idle for at least the sensing interval T short_dl = 25 us. Here, T short_dl is the interval T f (= 16 us) and the next following one sensing slot interval. In Type 2A UL CAP, T f includes a sensing slot at the start of the interval. In Type 2B UL CAP, the terminal can transmit immediately after the channel has been sensed idle for the sensing interval T f = 16 us. In Type 2B UL CAP, T f includes a sensing slot within the last 9 us of the interval. In Type 2C UL CAP, the terminal does not sense the channel before performing transmission.

[0202] For example, according to the type 1 LBT-based NR-U operation, a terminal having uplink data to transmit can select a CAPC mapped to the 5QI of the data, and the terminal can apply the parameters of the CACP (e.g., minimum contention window size, max contention window size, m p etc.) to perform the NR-U operation. For example, the terminal can select a random value between the minimum CW and the maximum CW mapped to the CAPC and then select a BC (Back off Counter). In this case, for example, the BC can be a positive integer less than or equal to the random value. A terminal that senses the channel decreases the BC by 1 if the channel is idle. If the BC becomes zero and the terminal detects that the channel is idle for a time of T d (T d =T f +m p *T sl ), the terminal can occupy the channel and attempt to transmit data. For example, T sl (=9 usec) is a basic sensing unit or sensing slot and can include a measurement duration of at least 4 usec. For example, 9 usec at the front of T f (=16 usec) is composed of T sl .

[0203] For example, according to the type 2 LBT-based NR-U operation, the terminal can perform type 2 LBT (e.g., Type2A LBT, Type2B LBT, Type2C LBT) within the COT to perform data transmission.

[0204] For example, Type 2A (also called Cat-2 LBT (oneshot LBT) or one-shot LBT) can be 25 usec one-shot LBT. In this case, transmission can start immediately after idle sensing for at least a 27 usec gap. Type 2A is used to initiate SSB and non-unicast DL information transmission. That is, the terminal can sense the channel for 25 usec within the COT, and if the channel is idle, the terminal can occupy the channel and attempt data transmission.

[0205] For example, Type 2B can be 16 usec one-shot LBT. In this case, transmission can start immediately after idle sensing for a 16 usec gap. That is, the terminal can sense the channel for 16 usec within the COT, and if the channel is idle, the terminal can occupy the channel and attempt data transmission.

[0206] For example, in the case of Type 2C (also called Cat-1 LBT or No LBT), LTB may not be executed. In this case, transmission can start immediately after a maximum 16 usec gap and the channel may not be sensed before the said transmission. The duration of the transmission can be up to 584 usec. The terminal can attempt transmission 16 usec later without sensing, and the terminal can perform transmission for up to 584 usec.

[0207] In the side link unlicensed band, the terminal can execute a channel connection operation based on LBT (Listen Before Talk). Before connecting to an unlicensed band channel, the terminal needs to check whether the pre-connection channel is idle (for example, the state where the terminal does not occupy the channel, or the state where the terminal is connected to the channel and data transmission is possible) or busy (for example, the state where the channel is occupied and data transmission and reception operations are executed on the channel, and the terminal attempting to connect to the channel cannot transmit data when the channel is busy). That is, the operation of the terminal checking whether the channel is idle or busy can be called CCA (Clear Channel Assessment), and the terminal can check whether the channel is idle or busy during the CCA duration.

[0208] On the other hand, in the next-generation system, the terminal can execute SL transmission and / or reception operations in the unlicensed band. On the other hand, the operation in the unlicensed band is preceded by a channel sensing operation (for example, energy detection / measurement) for the channel to be used before the terminal executes transmission according to band-by-band regulations or requirements. The terminal can execute transmission for the unlicensed band only when the channel or RB set to be used is determined to be idle (IDLE) based on the result of the channel sensing (for example, when the measured energy is less than or equal to a specific threshold). When the channel or RB set to be used is determined to be busy (BUSY) based on the result of the channel sensing (for example, when the measured energy is greater than or equal to a specific threshold), the terminal can cancel all or part of the transmission for the unlicensed band.

[0209] On the other hand, in the operation in the unlicensed band, after the terminal transmits data for a specific time interval, the channel sensing operation is omitted or simplified (the channel sensing interval is relatively small) within a certain time. On the other hand, after a certain time has passed after transmission, whether transmission is possible is determined after a general channel sensing operation is executed.

[0210] On the other hand, in transmission in the unlicensed band, depending on regulations or requirements, the time interval of the signal / channel transmitted by the terminal, and / or the size of the frequency occupancy area, and / or the power spectral density (PSD) may each be equal to or higher than a certain level.

[0211] On the other hand, for the simplification of channel sensing in the unlicensed band, the content of occupying a channel secured through initial general channel sensing for a certain period of time may be notified via channel occupancy time (COT) interval information. The length of the COT interval has its maximum value set differently according to the priority of the service or data packet, or the channel access priority class (CAPC).

[0212] On the other hand, the base station can share the COT interval secured through its own channel sensing in the form of DCI transmission. The terminal can execute a specific (indicated) channel sensing type and / or CP extension within the COT interval based on the DCI information received from the base station. On the other hand, the terminal can share the COT interval secured through its own channel sensing with the base station that is the recipient of the terminal's UL transmission again, and the relevant information is provided via UL through CG-UCI. In the above situation, the base station can execute simplified channel sensing within the COT interval shared by the terminal.

[0213] On the other hand, in the case of SL communication, there is also a situation where the resources used by the terminal for SL transmission from the base station are indicated via DCI or RRC signaling like in Mode 1 RA operation, and there is an operation where SL transmission and reception are executed via an inter-terminal sensing operation without the help of the base station like in Mode 2 RA operation.

[0214] On the other hand, in the case of channel access type 1 that can be used regardless of the COT (channel occupancy time) setting, in the case of DL transmission, procedures such as those in Tables 10 and 11 were executed, and in the case of UL transmission, procedures such as those in Tables 12 and 13 were executed.

[0215] In the present disclosure, channel access can be mutually replaced / substituted with channel sensing.

[0216]

Table 10

[0217]

Table 11

[0218]

Table 12

[0219]

Table 13

[0220] On the other hand, a simplified channel access type 2 was used before transmission within the COT (channel occupancy time). In the case of DL transmission, procedures such as those in Table 14 were executed, and in the case of UL transmission, procedures such as those in Table 15 were executed.

[0221]

Table 14

[0222]

Table 15

[0223] According to an embodiment of the present disclosure, type 2 ASL channel access is a method such as type 2 ADL and / or UL channel access. A sensing interval of T_short_sl = 25 us and a T_f = 16 us interval directly connected to the sensing interval are composed of one sensing slot, and T_f may be in a form including a sensing slot at the start portion. The basic idle determination also uses the DL or UL method.

[0224] According to an embodiment of the present disclosure, type 2 BSL channel access is a method such as type 2 BDL and / or UL channel access. A sensing interval of T_f = 16 us and T_f may be in a form including a sensing slot in the last 9 us interval. The basic idle determination also uses the DL or UL method.

[0225] According to an embodiment of the present disclosure, type 2 CSL channel access is a method such as type 2 CDL and / or UL channel access, and channel sensing may not be performed. Instead, the time interval of SL transmission may be up to 584 us.

[0226] According to an embodiment of the present disclosure, type 1 SL channel access is a method such as type 1 DL and / or UL channel access. i) Randomly derive an integer value N based on the contention window size corresponding to the priority class. ii) When the channel sensing result for the defer duration of T_d size corresponding to the priority class is idle, reduce the counter value by N - 1 in units of T_sl when it is idle. iii) If the value of the counter is 0, the terminal can occupy the RB set or channel to be channel sensed.

[0227] However, if a part of the channel sensing result for the T_sl interval is determined to be busy, the counter value is maintained as it is until the channel sensing result for the extended interval unit of T_d size becomes idle again, and the channel sensing continues. In the above, the extended interval of T_d length is in a form where m_p consecutive T_sl are configured after T_f = 16 us, where m_p is a value determined by the priority class p and T_sl is a time interval during which channel sensing may be executed at 9 us.

[0228] According to an embodiment of the present disclosure, when the terminal is in a state of occupying a channel via type 1 SL channel access and the terminal is not ready for sidelink transmission, the terminal sets an extended interval of T_d length and a sensing interval of T_sl length immediately before the sidelink transmission for which it is ready, and can execute the sidelink transmission immediately if both are idle. Here, if either one of the two is busy, the terminal can execute type 1 SL channel access again.

[0229] For example, if it is difficult to perform sidelink transmission at the time when channel sensing ends (for example, when the end time of channel sensing is after the start time of sidelink transmission), the terminal can reselect the sidelink transmission resource. For example, in the above, the reselected resource is selected in consideration of the end time of channel sensing and / or the length of the remaining sensing interval. For example, the remaining sensing interval may be a value derived assuming that the channel sensing is all idle.

[0230] On the other hand, as part of reducing the overhead due to the channel access operation, the terminal can execute continuous transmissions so that the transmission gap becomes below a certain level. Also, for example, the terminal can omit the channel sensing operation in the middle of the same transmission burst (the continuous transmission).

[0231] For example, the time interval between transmissions within a sidelink transmission burst can be less than or equal to a specific value. For example, the specific value can be 16 usec. For example, the CAPC and / or SL priority values for the sidelink transmission(s) can be the same.

[0232] According to one embodiment of the present disclosure, the receiving terminals for the sidelink transmission burst can be the same.

[0233] For example, the fact that the receiving terminals for the transmission are the same can mean the case of unicast PSCCH / PSSCH transmission. For example, the fact that the receiving terminals for the transmission are the same can mean that the PSCCH / PSSCH is for the same TB (e.g., the same source ID and / or the same destination ID and / or the same HARQ process ID). For example, the fact that the receiving terminals for the transmission are the same can include the situation where PSCCH / PSSCH transmission is performed for broadcast. For example, the fact that the receiving terminals for the transmission are the same can include the situation where groupcast PSCCH / PSSCH transmission is performed in a situation involving information exchange between the transmitting terminal and the receiving terminal or where the transmitting terminal recognizes the receiving terminal. For example, the fact that the receiving terminals for the transmission are the same can include the situation where PSFCH transmission is performed by the transmitting terminal for transmitting control information to the receiving terminal and / or for reducing the inter-transmission time interval. For example, the fact that the receiving terminals for the transmission are the same can include the situation where S-SSB transmission is performed.

[0234] For example, when the sidelink transmission interval for the transmitting terminal exceeds a specific value and / or when the receiving terminal is changed, the previous transmission and subsequent transmissions can belong to different sidelink transmission bursts. For example, the specific value can be 16 usec or 25 usec. For example, when the receiving terminal is changed, the case where the previous transmission or subsequent transmission is a broadcast transmission can be excluded.

[0235] According to an embodiment of the present disclosure, the transmitting terminal and / or the receiving terminal is divided based on the L1-source ID and / or the L2-source ID and / or the L1-destination ID and / or the L2-destination ID.

[0236] According to an embodiment of the present disclosure, after the transmitting terminal successfully accesses the channel for the same SL transmission burst, the transmitting terminal can omit channel sensing for the transmissions within the transmission burst and execute the transmission.

[0237] On the other hand, after the transmitting terminal attempts to access the channel by the type 1 channel access procedure for the SL transmission burst, it may fail. In this case, the transmitting terminal can attempt to access the channel again by the type 1 channel access procedure for the next transmission resource within the SL transmission burst.

[0238] For example, if the transmitting terminal fails to access the channel according to the type 1 channel access procedure for a specific transmission resource within the SL transmission burst, the transmitting terminal can execute the type 1 channel access procedure for the next transmission resource within the SL transmission burst following the type 1 channel access procedure for the previous transmission. For example, in the operation of continuously executing the type 1 channel access procedure, the counter value is not newly selected, the ongoing type 1 channel access procedure is continuously executed, and the result of the continuously executed type 1 channel access is used for the transmission determination for the next transmission resource.

[0239] For example, when the transmitting terminal fails to access the channel according to the type 1 channel access procedure for a specific transmission resource within the SL transmission burst, the transmitting terminal can terminate the ongoing type 1 channel access procedure and start the type 1 channel access procedure for the next transmission resource within the SL transmission burst again.

[0240] According to an embodiment of the present disclosure, whether the transmitting terminal continues the type 1 channel access procedure for the previous transmission for the next transmission or ends the type 1 channel access procedure for the previous transmission and starts a new type 1 channel access procedure is determined based on at least one of the CAPC for the previous transmission, the SL priority, the CAPC for the next transmission, the remaining counter value for the previous type 1 channel access procedure, the combination of the SL priorities, the relationship between the receiving terminal for the previous transmission and the receiving terminal for the next transmission, the number or ratio of channel access failures within the SL transmission burst, and / or the change in (reference) SL transmission power.

[0241] For example, if the CAPC value and / or the SL priority value for the previous transmission is greater than and / or equal to the CAPC value and / or the SL priority value for the next transmission, the transmitting terminal can continue the ongoing type 1 channel access procedure for the next transmission. And / or, for example, in the reverse case, the transmitting terminal can restart the type 1 channel access procedure. This may be to prevent the new transmission of the transmitting terminal from transiently interfering with the channel access of other terminals.

[0242] For example, if the CAPC value and / or the SL priority value for the previous transmission is less than and / or equal to the CAPC value and / or the SL priority value for the next transmission, the transmitting terminal can continue the ongoing type 1 channel access procedure for the next transmission. And / or, for example, in the reverse case, the transmitting terminal can restart the type 1 channel access procedure. This is to increase the channel access possibility according to the priority of the new transmission when the transmission opportunity of the previous transmission has disappeared.

[0243] For example, if the actual and / or reference transmission power of a previous transmission is different from that of the next transmission, and / or if there is a difference between the actual and / or reference transmission power of a previous transmission and that of the next transmission that is equal to or greater than a (predetermined) set or predefined level, the transmitting terminal can terminate the ongoing type 1 channel access procedure for the previous transmission and restart the type 1 channel access procedure for the next transmission. This is because the energy threshold used for channel sensing determination may be different due to the change in transmission power.

[0244] For example, the situation where there is a difference of a certain level or more in the (reference) transmission power between the previous transmission and the next transmission in the above may be a case where the transmission power value for the previous transmission is greater than and / or equal to the transmission power value for the next transmission. For example, the situation where there is a difference of a certain level or more in the (reference) transmission power between the previous transmission and the next transmission in the above may be a case where the transmission power value for the previous transmission is less than and / or equal to the transmission power value for the next transmission.

[0245] For example, if it is determined that there is not enough processing time when executing a new type 1 channel access procedure for the next transmission, the transmitting terminal can continue the type 1 channel access procedure for the previous transmission.

[0246] For example, when executing the type 1 channel access procedure for an SL transmission burst, the reference CAPC value and / or SL priority value can be the maximum value among the CAPC values and / or SL priority values for the transmissions within the same SL transmission burst. Or, for example, when executing the type 1 channel access procedure for an SL transmission burst, the reference CAPC value and / or SL priority value can be the minimum value among the CAPC values and / or SL priority values for the transmissions within the same SL transmission burst.

[0247] For example, when executing the type 1 channel access procedure for an SL transmission burst, the reference CAPC value and / or SL priority value can be the CAPC value and / or SL priority value for the transmission targeted by the current channel access within the same SL transmission burst or the first transmission (or, the initial transmission) within the SL transmission burst. For example, when executing the type 1 channel access procedure for an SL transmission burst, the reference CAPC value and / or SL priority value can be the CAPC value and / or SL priority value for the transmission that is the target of the current channel access within the same SL transmission burst or the latest transmission in terms of time within the SL transmission burst. For example, the start transmission is executed based on the initial resources.

[0248] For example, the transmission(s) within the SL transmission burst referred to for selecting the reference CAPC value and / or SL priority value may be limited to being selected by the transmitting terminal from among the CAPC value and / or SL priority value based on the processing time when executing the type 1 channel access procedure.

[0249] On the other hand, the interval between different SL transmission bursts can be within 16 usec. For example, when the transmitting terminal starts different SL transmission bursts, the transmitting terminal can attempt to access the channel by the type 1 channel access procedure. For example, the method may be limited to the case where there is no shared COT section for sidelink transmission.

[0250] For example, when the transmitting terminal starts different SL transmission bursts, if the channel sensing result is idle for an N usec interval smaller than 16 usec before the transmission resource, the transmitting terminal can start the transmission for the SL transmission burst. For example, the criterion for determining idle for the N usec interval can be that the channel is idle for at least between 5 usec or 4 usec. For example, the end point of the section where the actual channel sensing is performed may not precede further than 5 usec or 4 usec from the start of the target transmission. For example, when the transmitting terminal starts different SL transmission bursts, the transmitting terminal can perform channel access by a channel access procedure of type 2 series (type 2A and / or type 2B and / or type 2C) from the second resource. In an embodiment of the present disclosure, it can be assumed that the COT related to the SL transmission burst is shared for the transmitting terminal.

[0251] For example, the terminal may not expect that the interval between different SL transmission bursts is within 16 usec or within 25 usec. Or, for example, it is guaranteed that the interval between different SL transmission bursts is within 16 usec or within 25 usec. For example, the transmission interval can be adjusted via the CPE executed by the terminal and / or via puncturing for a partial area of a specific symbol.

[0252] On the other hand, when the transmitting terminal tries to transmit for the SL transmission burst, the SL transmission burst is within the COT section shared by the transmitting terminal. In the above case, when transmitting the SL transmission burst, the transmitting terminal can perform channel access by a channel access procedure of type 2 series. For example, the transmitting terminal can perform channel access based on type 2B channel access for the SL transmission burst. When the channel access fails, the transmitting terminal can perform channel access based on type 2A channel access for the next transmission within the SL transmission burst.

[0253] For example, when the transmitting terminal performs channel access for an SL transmission burst by means of type 2 series channel access, if the number of channel access failures for the transmission(s) within the SL transmission burst is greater than or equal to a (pre-)set or pre-defined threshold value and / or if the ratio of the number of channel access failures to the total number of transmissions within the SL transmission burst is greater than or equal to a (pre-)set or pre-defined threshold value, the transmitting terminal can omit the transmission for the said SL transmission burst, can re-select the (remaining) resources for the SL transmission burst, and / or can attempt to perform channel access by means of type 1 channel access for the SL transmission burst.

[0254] On the other hand, the transmitting terminal can succeed in the channel access for the SL transmission burst, stop the transmission during the execution of the transmission, and can also resume the transmission within the SL transmission burst again. For example, resuming the transmission again after the transmission stop within the said SL transmission burst can include the case where there is a time interval in the physical slot domain related to the logical slot belonging to the resource pool according to the resource pool setting.

[0255] For example, the transmitting terminal can determine differently the channel access type for the resumed transmission within the said SL transmission burst according to the channel sensing result after the transmission stop. For example, when the channel sensing result is idle, the transmitting terminal can attempt to perform channel access by means of type 1 channel access procedure at the time of resuming the transmission, and / or when it is busy, the transmitting terminal can attempt to perform channel access by means of type 2 series (type 2A and / or type 2B and / or type 2C) channel access procedure at the time of resuming the transmission.

[0256] For example, when the receiving terminal is different between the transmission before suspension and the resumed transmission within the SL transmission burst and / or when the TB is different and / or when the (reference) transmission power is different and / or when the CAPC is different and / or when the SL priority is different, regardless of the channel sensing result after the transmission suspension, the actual transmission permission for the resumed transmission is determined by the type 1 channel access procedure.

[0257] In the embodiments of the present disclosure, being different means that there may be a case where the difference is above a certain level. In the embodiments of the present disclosure, being different means that there may be a case where the difference is increased and / or decreased by a certain level or more, and the criteria for increase or decrease may be different for each factor.

[0258] In the embodiments of the present disclosure, the change in the contention window size for all priority classes has been described, but the idea of the present disclosure can be extended and applied in such a way that the contention window size is changed for a specific priority class or by SL priority value.

[0259] The method described in the embodiments of the present disclosure can operate in different combinations depending on whether the transmission is within the COT initialized by the transmitting terminal or within the shared COT acquired by the transmitting terminal from another transmitting node or outside the COT.

[0260] The proposed method can be applied to the device described below. First, the processor 202 of the receiving terminal can set at least one BWP. Then, the processor 202 of the receiving terminal can control the transceiver 206 of the receiving terminal to receive the sidelink-related physical channel and / or sidelink-related reference signal from the transmitting terminal on at least one BWP.

[0261] According to the existing technology, in unlicensed band side-link burst transmission, when the CAPCs related to each transmission are different from each other, a method for determining the length of the channel sensing window is not provided, and the channel sensing operation related to burst transmission is not performed. According to an embodiment of the present disclosure, among the channel sensing windows possible in relation to burst transmission, the largest channel sensing window is determined to resolve ambiguity, and it is possible to avoid the case where the transmission of other devices in the unlicensed band is limited only transiently, and there is an effect of creating a smoother environment in the unlicensed band.

[0262] FIG. 18 shows a procedure for a first device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 18 can be combined with various embodiments of the present disclosure.

[0263] Referring to FIG. 18, in step S1810, the first device can select a plurality of resources for performing a burst transmission including a plurality of transmissions. In step S1820, the first device can determine the length of the channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among the plurality of CAPC (channel access priority class) values related to the plurality of transmissions. In step S1830, the first device can perform a first channel sensing for an initial resource among the plurality of resources. In step S1840, the first device can perform the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0264] For example, based on the result of the first channel sensing being IDLE, channel sensing for resources excluding the initial resource among the plurality of resources may not be performed.

[0265] For example, among the plurality of transmissions, based on the difference between the first transmission power related to the first transmission and the second transmission power related to the second transmission after the first transmission among the plurality of transmissions being equal to or less than a threshold value, channel sensing for the resources related to the second transmission may not be executed.

[0266] For example, the first channel sensing may be type 1 LBT.

[0267] For example, the time interval between the plurality of resources may be equal to or less than a specific value.

[0268] For example, the specific value may be 16 usec.

[0269] For example, the plurality of transmissions may be transmissions to a second device.

[0270] For example, at least one of the source ID or destination ID related to each of the plurality of transmissions may be all the same.

[0271] For example, the plurality of transmissions may include at least one PSCCH (physical sidelink control channel) transmission or at least one PSSCH (physical sidelink shared channel) transmission.

[0272] For example, the plurality of transmissions may include at least one PSFCH (physical sidelink feedback channel) transmission.

[0273] For example, the plurality of transmissions may include transmissions to a second device and transmissions to a third device.

[0274] For example, further, the first device can perform resource reselection for the plurality of resources based on the result of the first channel sensing being BUSY for a threshold number of times or more.

[0275] For example, further, the first device can perform second channel sensing on a resource next to the initial resource among the plurality of resources based on the result of the first channel sensing being BUSY.

[0276] The above-described embodiments can be applied to various devices described below. For example, the processor 102 of the first device 100 can select a plurality of resources for performing burst transmission including a plurality of transmissions. Then, the processor 102 of the first device 100 can determine the length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values related to the plurality of transmissions. Then, the processor 102 of the first device 100 can perform first channel sensing on an initial resource among the plurality of resources. Then, the processor 102 of the first device 100 can control the transceiver 106 to perform the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0277] According to an embodiment of the present disclosure, a first device for performing wireless communication is provided. For example, the first device can include at least one transceiver, at least one processor, and at least one memory connected to be executable by the at least one processor and storing instructions for executing operations on the first device based on being executed by the at least one processor. For example, the operations can include selecting a plurality of resources for performing a burst transmission including a plurality of transmissions, determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, performing a first channel sensing on an initial resource among the plurality of resources, and performing the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0278] For example, based on the result of the first channel sensing being IDLE, channel sensing for resources other than the initial resource among the plurality of resources may not be performed.

[0279] For example, based on a difference between a first transmission power associated with a first transmission among the plurality of transmissions and a second transmission power associated with a second transmission after the first transmission among the plurality of transmissions being less than or equal to a threshold value, channel sensing for resources associated with the second transmission may not be performed.

[0280] For example, the first channel sensing can be type 1 LBT.

[0281] For example, a time interval between the plurality of resources can be less than or equal to a specific value.

[0282] For example, the specific value can be 16 usec.

[0283] For example, the plurality of transmissions may be transmissions to a second device.

[0284] For example, at least one of the source ID or the destination ID associated with each of the plurality of transmissions may be the same for all.

[0285] For example, the plurality of transmissions may include at least one PSCCH (physical sidelink control channel) transmission or at least one PSSCH (physical sidelink shared channel) transmission.

[0286] For example, the plurality of transmissions may include at least one PSFCH (physical sidelink feedback channel) transmission.

[0287] For example, the plurality of transmissions may include transmissions to a second device and transmissions to a third device.

[0288] For example, further, the operation may further include performing resource reselection for the plurality of resources based on the result of the first channel sensing being BUSY for a threshold number of times or more.

[0289] For example, further, the operation may further include performing a second channel sensing for a resource following the initial resource among the plurality of resources based on the result of the first channel sensing being BUSY.

[0290] According to an embodiment of the present disclosure, an apparatus configured to control a first terminal is provided. For example, the apparatus may include at least one processor and at least one memory connected to be executable by the at least one processor and storing instructions for performing operations on the first terminal based on being executed by the at least one processor. For example, the operations may include selecting a plurality of resources for performing a burst transmission including a plurality of transmissions, determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, performing a first channel sensing on an initial resource among the plurality of resources, and performing the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0291] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions is provided. For example, when executed, the instructions may cause a first device to select a plurality of resources for performing a burst transmission including a plurality of transmissions, determine a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions, perform a first channel sensing on an initial resource among the plurality of resources, and perform the burst transmission based on the result of the first channel sensing being IDLE and the plurality of resources.

[0292] FIG. 19 shows a procedure for a second device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 19 can be combined with various embodiments of the present disclosure.

[0293] Referring to FIG. 19, in step S1910, the second device can receive a burst transmission from the first device based on a plurality of resources. For example, the burst transmission includes a plurality of transmissions, and the burst transmission is transmitted based on the result of the first channel sensing for an initial resource among the plurality of resources being IDLE, and the length of the channel sensing window for performing channel sensing for the plurality of transmissions is determined based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions.

[0294] For example, based on the result of the first channel sensing being IDLE, channel sensing for resources among the plurality of resources excluding the initial resource may not be performed.

[0295] The above-described embodiments can be applied to various devices described below. For example, the processor 202 of the second device 200 can control the transceiver 206 to receive a burst transmission from the first device 100 based on a plurality of resources. For example, the burst transmission includes a plurality of transmissions, and the burst transmission is transmitted based on the result of the first channel sensing for an initial resource among the plurality of resources being IDLE, and the length of the channel sensing window for performing channel sensing for the plurality of transmissions is determined based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions.

[0296] According to an embodiment of the present disclosure, a second device for performing wireless communication is provided. For example, it can include at least one transceiver, at least one processor, and at least one memory that is connected to be executable by the at least one processor and stores instructions for executing operations on the second device based on being executed by the at least one processor. For example, the operation includes receiving a burst transmission based on a plurality of resources from a first device, where the burst transmission includes a plurality of transmissions, the burst transmission is transmitted based on the result of a first channel sensing for an initial resource among the plurality of resources being IDLE, and the length of a channel sensing window for performing channel sensing for the plurality of transmissions is determined based on the highest value among a plurality of CAPC (channel access priority class) values related to the plurality of transmissions.

[0297] For example, based on the result of the first channel sensing being IDLE, channel sensing for resources among the plurality of resources excluding the initial resource may not be performed.

[0298] Various embodiments of the present disclosure can be mutually combined.

[0299] Hereinafter, devices to which various embodiments of the present disclosure are applied will be described.

[0300] Although not limited thereto, various descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in this document can be applied to various fields that require wireless communication / connection (e.g., 5G) between devices.

[0301] FIG. 20 shows a communication system 1 according to an embodiment of the present disclosure. The embodiment of FIG. 20 can be combined with various embodiments of the present disclosure.

[0302] Referring to FIG. 20, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station, and a network. Here, the wireless device means a device that executes communication using a wireless connection technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)), and is called a communication / wireless / 5G device. Without being limited thereto, the wireless device can include a robot 100a, vehicles 100b-1, 100b-2, an XR (Extended Reality) device 100c, a hand-held device 100d, home appliances 100e, an IoT (Internet of Thing) device 100f, and an AI device / server 400. For example, the vehicle can include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of executing communication between vehicles, etc. Here, the vehicle can include a UAV (Unmanned Aerial Vehicle) (e.g., a drone). The XR device includes an AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) device, and can be embodied in the form of an HMD (Head-Mounted Device), an HUD (Head-Up Display) provided in a vehicle, a TV, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. The hand-held device can include a smartphone, a smart pad, a wearable device (e.g., a smartwatch, smart glasses), a computer (e.g., a notebook, etc.). The home appliances can include a TV, a refrigerator, a washing machine, etc. The IoT device can include a sensor, a smart meter, etc. For example, the base station and the network can be embodied by a wireless device, and a specific wireless device 200a can also operate as a base station / network node for other wireless devices.

[0303] Here, the wireless communication technologies implemented in the wireless devices 100a to 100f in this specification can include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. At this time, for example, the NB-IoT technology is an example of LPWAN (Low Power Wide Area Network) technology and can be implemented as standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Further or generally, the wireless communication technologies implemented in the wireless devices 100a to 100f in this specification can communicate based on LTE-M technology. At this time, as an example, the LTE-M technology is an example of LPWAN technology and is called by various names such as eMTC (enhanced Machine Type Communication). For example, the LTE-M technology can be implemented by at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-mentioned names. Further, or generally, the wireless communication technologies implemented in the wireless devices 100a to 100f in this specification can include at least any one of ZigBee (registered trademark), Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN) considering low-power communication, and are not limited to the above-mentioned names. As an example, the Zigbee technology can generate PAN (personal area networks) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and is called by various names.

[0304] Wireless devices 100a to 100f can be connected to network 300 via base station 200. AI (Artificial Intelligence) technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can be connected to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network, etc. Wireless devices 100a to 100f can also communicate with each other via base station 200 / network 300, but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0305] Wireless devices 100a to 100f / base station 200, between base stations 200 / base stations 200, wireless communication / connection 150a, 150b, 150c can be performed. Here, the wireless communication / connection can be performed via uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication 150c between base stations (for example, various wireless connection technologies such as relay, IAB (Integrated Access Backhaul) (for example, 5G NR)). Through the wireless communication / connection 150a, 150b, 150c, the wireless device and the base station / wireless device, and the base station and the base station can transmit / receive wireless signals to and from each other. For example, the wireless communication / connection 150a, 150b, 150c can transmit / receive signals via various physical channels. Therefore, based on various proposals of the present disclosure, at least a part of various configuration information setting processes, various signal processing processes (for example, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. for transmitting / receiving wireless signals can be executed.

[0306] FIG. 21 shows a wireless device according to an embodiment of the present disclosure. The embodiment of FIG. 21 can be combined with various embodiments of the present disclosure.

[0307] Referring to FIG. 21, the first wireless device 100 and the second wireless device 200 can transmit and receive wireless signals via various wireless connection technologies (for example, LTE, NR). Here, {the first wireless device 100, the second wireless device 200} can correspond to {the wireless device 100x, the base station 200} and / or {the wireless device 100x, the wireless device 100x} in FIG. 25.

[0308] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 can control the memory 104 and / or the transceiver 106, and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. For example, after the processor 102 processes the information in the memory 104 to generate a first information / signal, it can transmit a wireless signal including the first information / signal via the transceiver 106. Also, after the processor 102 receives a wireless signal including a second information / signal via the transceiver 106, it can store the information obtained from the signal processing of the second information / signal in the memory 104. The memory 104 can be connected to the processor 102 and can store various information related to the operation of the processor 102. For example, the memory 104 can execute some or all of the processes controlled by the processor 102, or can store software code including instructions for executing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor 102 and the memory 104 are part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 106 can be connected to the processor 102 and can transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 can include a transmitter and / or a receiver. The transceiver 106 can be used interchangeably with an RF (Radio Frequency) unit. In this disclosure, the wireless device can also mean a communication modem / circuit / chip.

[0309] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 can control the memory 204 and / or the transceiver 206 and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. For example, after processing the information in the memory 204 to generate a third piece of information / signal, the processor 202 can transmit a wireless signal including the third piece of information / signal via the transceiver 206. Also, after receiving a wireless signal including a fourth piece of information / signal via the transceiver 206, the processor 202 can store the information obtained from the signal processing of the fourth piece of information / signal in the memory 204. The memory 204 can be coupled to the processor 202 and can store various information related to the operation of the processor 202. For example, the memory 204 can execute some or all of the processes controlled by the processor 202 or store software code including instructions for executing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor 202 and the memory 204 are part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 206 can be coupled to the processor 202 and can transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 can include a transmitter and / or a receiver, and the transceiver 206 can be mixed with an RF unit. In the present disclosure, the wireless device can also mean a communication modem / circuit / chip.

[0310] The hardware elements of the wireless devices 100 and 200 will be described in more detail below. Without being limited thereto, one or more protocol layers can be implemented by one or more processors 102 and 202. For example, one or more processors 102 and 202 can implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102 and 202 can generate one or more PDUs (Protocol Data Units) and / or one or more SDUs (Service Data Units) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 can generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document, and provide them to one or more transceivers 106 and 206. One or more processors 102 and 202 can receive signals (e.g., baseband signals) from one or more transceivers 106 and 206, and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document.

[0311] One or more processors 102, 202 are referred to as a controller, microcontroller, microprocessor or microcomputer. One or more processors 102, 202 can be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more ASICs (Application Specific Integrated Circuits), one or more DSPs (Digital Signal Processors), one or more DSPDs (Digital Signal Processing Devices), one or more PLDs (Programmable Logic Devices) or one or more FPGAs (Field Programmable Gate Arrays) can be included in one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this document can be implemented using firmware or software, and the firmware or software can be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this document can be included in one or more processors 102, 202 as firmware or software configured to execute, or stored in one or more memories 104, 204 and driven by one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this document can be implemented using firmware or software in the form of code, instruction words and / or a set of instruction words.

[0312] One or more memories 104, 204 can be coupled to one or more processors 102, 202 and can store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104, 204 can be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or combinations thereof. One or more memories 104, 204 can be located inside and / or outside one or more processors 102, 202. Also, one or more memories 104, 204 can be coupled to one or more processors 102, 202 via various techniques such as wired or wireless connections.

[0313] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc. mentioned in the text, method, and / or operation flowchart to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106, 206 can be connected to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Also, one or more transceivers 106, 206 can be connected to one or more antennas 108, 208 and can be configured to transmit and receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document via one or more antennas 108, 208. In this document, one or more antennas are multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 can convert received wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors 102, 202. One or more transceivers 106, 206 can convert user data, control information, wireless signals / channels, etc. processed using one or more processors 102, 202 from baseband signals to RF band signals. For this purpose, one or more transceivers 106, 206 can include (analog) oscillators and / or filters.

[0314] FIG. 22 shows a signal processing circuit for a transmission signal according to an embodiment of the present disclosure. The embodiment of FIG. 22 can be combined with various embodiments of the present disclosure.

[0315] Referring to FIG. 22, the signal processing circuit 1000 can include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Without being limited thereto, the operations / functions of FIG. 22 can be executed by the processors 102 and 202 and / or the transceivers 106 and 206 of FIG. 21. The hardware elements of FIG. 22 can be implemented by the processors 102 and 202 and / or the transceivers 106 and 206 of FIG. 21. For example, blocks 1010 to 1060 can be implemented by the processors 102 and 202 of FIG. 21. Also, blocks 1010 to 1050 can be implemented by the processors 102 and 202 of FIG. 21, and block 1060 can be implemented by the transceivers 106 and 206 of FIG. 21.

[0316] The codeword can be converted into a radio signal through the signal processing circuit 1000 of FIG. 22. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a UL-SCH transmission block, a DL-SCH transmission block). The radio signal can be transmitted via various physical channels (e.g., PUSCH, PDSCH).

[0317] Specifically, the codeword can be converted into a bit sequence scrambled by the scrambler 1010. The scrambling sequence used for scrambling is generated based on an initialization value, and the initialization value can include ID information of the wireless device and the like. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation method can include pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), and the like. The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped to the corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 is obtained by multiplying the output y of the layer mapper 1030 by an N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 can perform precoding after performing a transform precoding (e.g., DFT transform) on the complex modulation symbol. Also, the precoder 1040 can perform precoding without performing transform precoding.

[0318] The resource mapper 1050 can map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources can include a plurality of symbols in the time domain (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) and a plurality of subcarriers in the frequency domain. The signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices via each antenna. For this purpose, the signal generator 1060 can include an IFFT (Inverse Fast Fourier Transform) module, a CP (Cyclic Prefix) inserter, a DAC (Digital-to-Analog Converter), a frequency uplink converter, etc.

[0319] In a wireless device, the signal processing process for a received signal can be configured as the reverse of the signal processing processes 1010 to 1060 in FIG. 22. For example, a wireless device (e.g., 100, 200 in FIG. 21) can receive a radio signal from the outside via an antenna port / transceiver. The received radio signal can be converted into a baseband signal via a signal restorer. For this purpose, the signal restorer can include a frequency downlink converter, an ADC (analog-to-digital converter), a CP remover, an FFT (Fast Fourier Transform) module. Thereafter, the baseband signal can be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword can be restored to the original information block through decoding. Therefore, the signal processing circuit (not shown) for the received signal can include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0320] FIG. 23 shows a wireless device according to an embodiment of the present disclosure. The wireless device can be realized in various forms depending on the usage example / service (see FIG. 20). The embodiment of FIG. 23 can be combined with various embodiments of the present disclosure.

[0321] Referring to FIG. 23, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 21 and can be composed of various elements, components (parts), units / sections, and / or modules. For example, the wireless devices 100 and 200 can include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit can include a communication circuit 112 and a transceiver(s) 114. For example, the communication circuit 112 can include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 21. For example, the transceiver(s) 114 can include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 21. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional elements 140 and controls various operations of the wireless device. For example, the control unit 120 can control the electrical / mechanical operations of the wireless device based on programs / codes / instructions / information stored in the memory unit 130. Also, the control unit 120 can transmit the information stored in the memory unit 130 to the outside (e.g., other communication devices) via a wireless / wired interface through the communication unit 110, or store the information received from the outside (e.g., other communication devices) via a wireless / wired interface through the communication unit 110 in the memory unit 130.

[0322] The additional element 140 can be configured in various ways depending on the type of wireless device. For example, the additional element 140 can include at least one of a power unit / battery, an input / output unit (I / O unit), a drive unit, and a computing unit. Without being limited thereto, the wireless device can be embodied in the form of a robot (100a in FIG. 20), a vehicle (100b-1, 100b-2 in FIG. 20), an XR device (100c in FIG. 20), a portable device (100d in FIG. 20), a household appliance (100e in FIG. 20), an IoT device (100f in FIG. 20), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 20), a base station (200 in FIG. 20), a network node, etc. The wireless device can be movable or used at a fixed location depending on the use-case / service.

[0323] In FIG. 23, various elements, components, units / parts, and / or modules within the wireless devices 100 and 200 can be interconnected entirely via a wired interface or at least partially wirelessly via the communication unit 110. For example, within the wireless devices 100 and 200, the control unit 120 and the communication unit 110 can be connected wiredly, and the control unit 120 and the first unit (e.g., 130, 140) can be connected wirelessly via the communication unit 110. Also, each element, component, unit / part, and / or module within the wireless devices 100 and 200 can further include one or more elements. For example, the control unit 120 can be composed of a set of one or more processors. For example, the control unit 120 can be composed of a set such as a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processing processor, a memory control processor, etc. As another example, the memory unit 130 can be composed of a RAM (Random Access Memory), a DRAM (Dynamic RAM), a ROM (Read Only Memory), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0324] Hereinafter, with reference to other drawings, a more detailed description will be given for the embodiment of FIG. 23.

[0325] FIG. 24 shows a mobile device according to an embodiment of the present disclosure. The mobile device can include a smartphone, a smart pad, a wearable device (e.g., a smartwatch, smart glasses), a portable computer (e.g., a notebook computer, etc.). The mobile device can be referred to as an MS (Mobile Station), a UT (user terminal), an MSS (Mobile Subscriber Station), an SS (Subscriber Station), an AMS (Advanced Mobile Station), or a WT (Wireless terminal). The embodiment of FIG. 24 can be combined with various embodiments of the present disclosure.

[0326] Referring to FIG. 24, the mobile device 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. The antenna unit 108 can be configured as part of the communication unit 110. Blocks 110-130 / 140a-140c respectively correspond to blocks 110-130 / 140 in FIG. 23.

[0327] The communication unit 110 can transmit and receive signals (such as data, control signals, etc.) with other wireless devices and base stations. The control unit 120 can control the components of the mobile device 100 and execute various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data / parameters / programs / codes / instructions necessary for the operation of the mobile device 100. Also, the memory unit 130 can store input / output data / information, etc. The power supply unit 140a supplies power to the mobile device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support the connection between the mobile device 100 and other external devices. The interface unit 140b can include various ports for connection with external devices (such as audio input / output ports, video input / output ports). The input / output unit 140c can receive or output video information / signals, audio information / signals, data, and / or information input from the user. The input / output unit 140c can include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module, etc.

[0328] As an example, in the case of data communication, the input / output unit 140c acquires information / signals (such as touch, text, voice, image, video) input from the user, and the acquired information / signals can be stored in the memory unit 130. The communication unit 110 converts the information / signals stored in the memory into a wireless signal and can directly transmit the converted wireless signal to other wireless devices or transmit it to the base station. Also, after receiving a wireless signal from other wireless devices or the base station, the communication unit 110 can restore the received wireless signal to the original information / signals. After the restored information / signals are stored in the memory unit 130, they can be output in various forms (such as text, voice, image, video, haptic) via the input / output unit 140c.

[0329] FIG. 25 shows a vehicle or an autonomous vehicle according to an embodiment of the present disclosure. The vehicle or the autonomous vehicle can be realized by a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, or the like. The embodiment of FIG. 25 can be combined with various embodiments of the present disclosure.

[0330] Referring to FIG. 25, the vehicle or autonomous vehicle 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 can be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d respectively correspond to blocks 110 / 130 / 140 in FIG. 23.

[0331] The communication unit 110 can transmit and receive signals (such as data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 can control the elements of the vehicle or the autonomous driving vehicle 100 and execute various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or the autonomous driving vehicle 100 to travel on the ground. The driving unit 140a can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b can supply power to the vehicle or the autonomous driving vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle state, surrounding environment information, user information, etc. The sensor unit 140c can include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection 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 illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technologies such as maintaining the lane during driving, automatically adjusting the speed like adaptive cruise control, automatically driving along a determined route, and automatically setting and driving along a route when a destination is set.

[0332] As an example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 can control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving route according to the driving plan (e.g., speed / direction adjustment). During autonomous driving, the communication unit 110 can non-periodically acquire the latest traffic information data from an external server and acquire the surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c can acquire vehicle state and surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle position, the autonomous driving route, the driving plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology, etc., based on the information collected from the vehicle or the autonomous driving vehicle, and can provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

[0333] The claims described in this specification can be combined in various ways. For example, the technical features of the method claims in this specification can be combined and implemented in an apparatus, and the technical features of the apparatus claims in this specification can be combined and implemented in a method. Also, the technical features of the method claims in this specification and the technical features of the apparatus claims can be combined and implemented in an apparatus, and the technical features of the method claims in this specification and the technical features of the apparatus claims can be combined and implemented in a method.

Claims

1. In a method for a first device to perform wireless communication, selecting a plurality of resources for performing a burst transmission including a plurality of transmissions; determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions; performing a first channel sensing on an initial resource among the plurality of resources; performing the burst transmission based on the result of the first channel sensing being idle and based on the plurality of resources. A method comprising:

2. Based on the result of the first channel sensing being idle, channel sensing for resources other than the initial resource among the plurality of resources is not performed. The method according to claim 1.

3. Based on a difference between a first transmission power associated with a first transmission among the plurality of transmissions and a second transmission power associated with a second transmission after the first transmission among the plurality of transmissions being equal to or less than a threshold value, channel sensing for resources associated with the second transmission is not performed. The method according to claim 2.

4. The first channel sensing is type 1 LBT. The method according to claim 1.

5. A time interval between the plurality of resources is equal to or less than a specific value. The method according to claim 1.

6. The specific value is 16 usec. The method according to claim 5.

7. The plurality of transmissions are transmissions to a second device. The method according to claim 1.

8. At least one of source IDs or destination IDs associated with each of the plurality of transmissions is the same. The method according to claim 7.

9. The plurality of transmissions include at least one physical sidelink control channel (PSCCH) transmission or at least one physical sidelink shared channel (PSSCH) transmission. The method according to claim 1.

10. The method according to claim 1, wherein the plurality of transmissions includes at least one PSFCH (physical sidelink feedback channel) transmission.

11. The method according to claim 1, wherein the plurality of transmissions includes a transmission to a second device and a transmission to a third device.

12. The method according to claim 1, further comprising performing resource reselection for the plurality of resources based on the result of the first channel sensing being busy for a threshold number of times or more.

13. The method according to claim 1, further comprising performing a second channel sensing for a resource following the initial resource among the plurality of resources based on the result of the first channel sensing being busy.

14. In a first device performing wireless communication, at least one transceiver, at least one processor, at least one memory connected to be executable by the at least one processor and storing instructions for performing operations on the first device based on being executed by the at least one processor, wherein the operations include: selecting a plurality of resources for performing a burst transmission including a plurality of transmissions; determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions; performing a first channel sensing for an initial resource among the plurality of resources; performing the burst transmission based on the result of the first channel sensing being idle and the plurality of resources.

15. In a device configured to control a first terminal, at least one processor, at least one memory connected to be executable by the at least one processor and storing instructions for performing operations on the first terminal based on being executed by the at least one processor, wherein the operations include: selecting a plurality of resources for performing a burst transmission including a plurality of transmissions; Determining a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among the plurality of CAPC (channel access priority class) values associated with the plurality of transmissions; Performing a first channel sensing on an initial resource among the plurality of resources; Performing the burst transmission based on the result of the first channel sensing being idle and the plurality of resources. The apparatus includes these steps.

16. As a non-transitory computer-readable storage medium storing instructions, When executed, the instructions cause a first apparatus to Select a plurality of resources for performing a burst transmission including a plurality of transmissions; Determine a length of a channel sensing window for performing channel sensing for the plurality of transmissions based on the highest value among the plurality of CAPC (channel access priority class) values associated with the plurality of transmissions; Perform a first channel sensing on an initial resource among the plurality of resources; Perform the burst transmission based on the result of the first channel sensing being idle and the plurality of resources. The non-transitory computer-readable storage medium is configured in this way.

17. In a method for a second apparatus to perform wireless communication, The method includes receiving a burst transmission from a first apparatus based on a plurality of resources, wherein the burst transmission includes a plurality of transmissions, the burst transmission is transmitted based on the result of a first channel sensing on an initial resource among the plurality of resources being idle, and a length of a channel sensing window for performing channel sensing for the plurality of transmissions is determined based on the highest value among the plurality of CAPC (channel access priority class) values associated with the plurality of transmissions.

18. The method according to claim 17, wherein, based on the result of the first channel sensing being idle, channel sensing for resources other than the initial resource among the plurality of resources is not performed.

19. In a second device that performs wireless communication, at least one transceiver; at least one processor; at least one memory that is connected to be executable by the at least one processor and stores instructions for causing the second device to perform operations based on being executed by the at least one processor, wherein the operations include: receiving a burst transmission based on a plurality of resources from a first device, wherein the burst transmission includes a plurality of transmissions, wherein the burst transmission is transmitted based on a result of a first channel sensing for an initial resource among the plurality of resources being idle, a second device, wherein a length of a channel sensing window for performing channel sensing for the plurality of transmissions is determined based on a highest value among a plurality of CAPC (channel access priority class) values associated with the plurality of transmissions.

20. The second device according to claim 19, wherein, based on a result of the first channel sensing being idle, channel sensing for resources among the plurality of resources excluding the initial resource is not performed.

Images