Multiple starting position-based communication methods and devices in unlicensed bands

Abstract

A method for a first device to perform wireless communication and a device supporting the same are provided. The method may include the steps of: measuring the SL (sidelink) RSSI (received signal strength indicator) over a CBR (channel busy ratio) measurement window in a resource pool; and obtaining the SL CBR based on the measurement. For example, the SL RSSI may be measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool.

Description

[Technical Field]

[0001] This disclosure relates to wireless communication systems. [Background technology]

[0002] 5G NR is a new clean-slate mobile communication system that succeeds LTE (Long Term Evolution) and features high performance, low latency, and high availability. 5G NR can utilize all available spectral resources, from the low-frequency band below 1 GHz to the intermediate-frequency band between 1 GHz and 10 GHz, and the high-frequency (millimeter wave) band above 24 GHz.

[0003] The goals of 6G (wireless communication) systems include (i) extremely high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) extremely low latency, (v) reduced energy consumption of battery-free IoT (Internet of Things) devices, (vi) ultra-high reliability connectivity, and (vii) connected intelligence with machine learning capabilities. The vision for 6G systems has four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and 6G systems can satisfy the requirements shown in Table 1 below. For example, Table 1 can show an example of the requirements for a 6G system.

[0004] [Table 1] [Overview of the project] [Means for solving the problem]

[0005] According to one embodiment of the present disclosure, a method is provided for a first device to perform wireless communication. For example, the method may include (encompass; configure; construct; set up; include; contain; contain; have; for example, the SL RSSI may be measured based on the position of a second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool.

[0006] According to one embodiment of the present disclosure, a first device configured to perform 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 the at least one processor for storing instructions. For example, based on the fact that the instructions are executed by the at least one processor, the first device may: measure the SL (sidelink) RSSI (received signal strength indicator) over a CBR (channel busy ratio) measurement window in a resource pool; and obtain the SL CBR based on the measurement. For example, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool, the SL RSSI may be measured based on the position of the second start symbol.

[0007] According to one embodiment of the present disclosure, a processing unit configured to control a first device is provided. For example, the processing unit may include at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the first device may be configured to: measure the SL (sidelink) RSSI (received signal strength indicator) across a CBR (channel busy ratio) measurement window in a resource pool, based on the instructions being executed by the at least one processor; and obtain the SL CBR based on the measurement. For example, the SL RSSI may be measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool.

[0008] According to one embodiment of the present disclosure, a non-temporary computer-readable storage medium recording instructions is provided. For example, when the instructions are executed, a first device may: measure the SL (sidelink) RSSI (received signal strength indicator) across a CBR (channel busy ratio) measurement window in a resource pool; and obtain the SL CBR based on the measurement. For example, the SL RSSI may be measured based on the position of the second start symbol, based on the availability of a first start symbol and a second start symbol in a slot in the resource pool. [Brief explanation of the drawing]

[0009] [Figure 1] This disclosure shows a communication structure that can be provided in a 6G system according to one embodiment of this disclosure. [Figure 2] An electromagnetic spectrum according to one embodiment of this disclosure is shown. [Figure 3]This disclosure presents an example of a typical NTN scenario based on a transparent payload, according to one embodiment of this disclosure. [Figure 4] This disclosure presents an example of a typical NTN scenario based on a regenerative payload, according to one embodiment of this disclosure. [Figure 5] An example of sensing operation according to one embodiment of this disclosure is shown. [Figure 6] This shows a frame slot structure according to one embodiment of the present disclosure. [Figure 7] An example of a BWP according to one embodiment of this disclosure is shown. [Figure 8] One embodiment of this disclosure illustrates a procedure for a terminal to perform V2X or SL communication depending on the resource allocation mode. [Figure 9] An interlaced RB according to one embodiment of this disclosure is shown. [Figure 10] This indicates a problem where the delay time is long due to a failure in channel sensing. [Figure 11] This shows the positions of multiple start symbols or multiple start times within a slot according to one embodiment of the present disclosure. [Figure 12] One embodiment of this disclosure describes a method for measuring the channel congestion level when there is a transmission of a first start symbol base and a transmission of a second start symbol base. [Figure 13] This disclosure describes a method by which a first device performs wireless communication according to one embodiment of this disclosure. [Figure 14] This disclosure illustrates a method by which a second device performs wireless communication according to one embodiment of this disclosure. [Figure 15] A communication system 1 according to one embodiment of this disclosure is shown. [Figure 16] A wireless device according to one embodiment of this disclosure is shown. [Figure 17]A signal processing circuit for a transmitted signal according to one embodiment of this disclosure is shown. [Figure 18] A wireless device according to one embodiment of this disclosure is shown. [Figure 19] A portable device according to one embodiment of this disclosure is shown. [Figure 20] An embodiment of the present disclosure shows a vehicle or an autonomous vehicle. [Modes for carrying out the invention]

[0010] In this specification, "A or B" may mean "just A," "just B," or "both A and B." Furthermore, in this specification, "A or B" may be interpreted as "A and / or B." For example, in this specification, "A, B or C" may mean "just A," "just B," "just C," or "any combination of A, B and C."

[0011] In this specification, slashes ( / ) and commas can mean "and / or". For example, "A / B" can mean "A and / or B". Thus, "A / B" can mean "just A", "just B", or "both A and B". For example, "A, B, C" can mean "A, B or C".

[0012] In this specification, "at least one of A and B" can mean "just A," "just B," or "both A and B." Furthermore, in this specification, the expressions "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."

[0013] Furthermore, in this specification, "at least one of A, B and C" may mean "just A," "just B," "just C," or "any combination of A, B and C." Also, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C."

[0014] Furthermore, parentheses used in this specification can mean "for example." Specifically, when "control information (PDCCH)" is shown, "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." Similarly, when "control information (i.e., PDCCH)" is shown, "PDCCH" is proposed as an example of "control information."

[0015] In the following explanation, "when, if, in case of" can be replaced with "based on".

[0016] In this specification, technical features described individually within a single drawing may be represented individually or simultaneously.

[0017] In this specification, higher layer parameters may be parameters that are set for a terminal, pre-configured, or predefined. For example, a base station or network may transmit higher layer parameters to a terminal. For example, higher layer parameters may be transmitted via RRC (radio resource control) signaling or MAC (medium access control) signaling.

[0018] In this specification, "configured or defined" can be interpreted as being configured or pre-configured in the device via predefined signaling (e.g., SIB, MAC, RRC) from a base station or network. In this specification, "configured or defined" can be interpreted as being pre-configured in the device.

[0019] The technologies proposed herein 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), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented in wireless technologies such as UTRA (universal terrestrial radio access) and CDMA2000. TDMA can be implemented in 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 in wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), LTE (long term evolution), and 5G NR.

[0020] The technologies proposed herein are implemented in 6G wireless technology and can be applied to various 6G systems. For example, 6G systems can have key factors such as eMBB (enhanced mobile broadband), URLLC (ultra-reliable low latency communications), mMTC (massive machine-type communication), AI (artificial intelligence) integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low back haul and access network congestion, and enhanced data security.

[0021] Figure 1 shows a communication structure that can be provided in a 6G system according to one embodiment of the present disclosure. The embodiment of Figure 1 can be combined with various embodiments of the present disclosure.

[0022] The new network characteristics in 6G are as follows:

[0023] - Satellite integrated network

[0024] - Connected Intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary, updating wireless technology from "connected things" to "connected intelligence." AI can be applied to each step of the communication procedure (or each step of the signal processing described below).

[0025] - Seamless integration of wireless information and energy transfer

[0026] - Ubiquitous Super 3D Connectivity: Connecting drones and very low Earth orbit satellites to the network and core network functions creates Super 3D connectivity in 6G Ubiquitous.

[0027] The following are some common requirements for the characteristics of the new 6G network described above:

[0028] - Small cell networks

[0029] - Ultra-dense heterogeneous network

[0030] - High-capacity backhaul

[0031] - Raider technology integrated with mobile technology: High-precision localization (or location-based services) via communications is one of the functions of 6G wireless communication systems. Therefore, radar systems can be integrated with 6G networks.

[0032] - Softwareization and virtualization

[0033] The core implementation technologies for 6G systems will be described below.

[0034] - Artificial Intelligence: Introducing AI into communications simplifies and improves real-time data transmission. AI can use numerous analyses to determine how complex target operations are performed. In other words, AI can increase efficiency and reduce processing delays. Time-consuming tasks such as handover, network selection, and resource scheduling can be performed instantly using AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine communications. Furthermore, AI enables rapid communication in BCI (Brain-Computer Interface). AI-based communication systems are supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent radio, self-sustaining wireless networks, and machine learning.

[0035] -THz communication (terahertz communication): Data transmission rates can be increased by increasing bandwidth. This can be achieved by using sub-THz communication with a wide bandwidth and applying advanced large-scale MIMO technology. THz waves, also known as sub-millimeter radiation, typically represent a frequency band between 0.1 THz and 10 THz with wavelengths in the 0.03 mm-3 mm range. The 100 GHz-300 GHz band range (Sub THz band) is considered the main part of the THz band for cellular communication. Adding the Sub-THz band to the mmWave band increases 6G cellular communication capacity. Of the defined THz band, 300 GHz-3 THz is in the far-infrared (IR) frequency band. The 300 GHz-3 THz band is part of a broadband but is at the boundary of the broadband, just behind the RF band. Therefore, this 300 GHz-3 THz band is similar to RF. Figure 2 shows the electromagnetic spectrum according to one embodiment of the present disclosure. The embodiment in Figure 2 can be combined with various embodiments of the present disclosure. The main characteristics of THz communication include (i) a wide bandwidth available to support very high data transmission rates, and (ii) high path loss occurring at high frequencies (highly directional antennas are essential). The narrow beamwidth generated by highly directional antennas reduces interference. The small wavelength of THz signals allows more antenna elements to be integrated into equipment and BS operating in this band. Through this, advanced adaptive array techniques can be used to overcome range limitations.

[0036] - Large-scale MIMO technology

[0037] - Hologram beamforming (HBF)

[0038] -Optical wireless technology

[0039] - Free-space optical backhaul network (FSO backhaul network)

[0040] -Quantum communication

[0041] - Cell-free communication

[0042] - Integration of wireless information and power transmission

[0043] - Integration of sensing and communication (wireless communication and scanning)

[0044] - Integrated access and backhaul network

[0045] - Big data analysis

[0046] - Reconfigurable intelligent surface

[0047] - Metaverse

[0048] - Blockchain

[0049] - Unmanned aerial vehicles (UAVs): UAVs, or drones, will be a crucial element in 6G wireless communication. In most cases, high-speed data wireless connectivity will be provided using UAV technology. Base station (BS) entities can be installed on UAVs to provide cellular connectivity. UAVs have certain features not found in fixed BS infrastructure, such as easy deployment, strong visible line links, and the freedom of controlled mobility. During emergencies such as natural disasters, the deployment of ground communication infrastructure is not economically feasible and sometimes cannot provide services in volatile environments. UAVs can easily handle such situations. UAVs can become a new paradigm in the field of wireless communication. This technology facilitates the three basic requirements of wireless networks: eMBB, URLLC, and mMTC. UAVs can also support various purposes such as improving network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, and accident monitoring. Therefore, UAV technology is recognized as one of the most important technologies for 6G communication.

[0050] - Advanced Air Mobility (AAM): AAM is a broader concept than UAM (urban air mobility), which refers to air transport available in urban areas. It encompasses transportation methods that include travel between regional hubs as well as within urban areas.

[0051] - Autonomous driving (self-driving): V2X (vehicle to everything), a key factor in building autonomous driving infrastructure, can be a technology that allows vehicles to communicate and share information with various elements on the road, such as vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I), in order to enable autonomous driving. To maximize the performance of autonomous driving and ensure high safety, fast transmission speeds and low latency technology are absolutely necessary. Furthermore, in the future, autonomous driving may go beyond simply conveying warning and guidance messages to the driver and may need to actively intervene in vehicle operation and directly control the vehicle in dangerous situations. For this reason, the amount of information that needs to be transmitted and received may become enormous, so it is expected that 6G will be able to maximize autonomous driving with faster transmission speeds and lower latency than 5G.

[0052] - Non-terrestrial networks (NTN): NTN can refer to a network or network segment that uses RF (radio frequency) resources onboard a satellite (or UAS (unmanned aerial system) platform). Figure 3 shows an example of a typical scenario of NTN based on a transparent payload according to one embodiment of this disclosure. Figure 4 shows an example of a typical scenario of NTN based on a regenerative payload according to one embodiment of this disclosure. Embodiments of Figure 3 or Figure 4 can be combined with various embodiments of this disclosure. Referring to Figure 3, the satellite (or UAS platform) can generate a service link with the UE. The satellite (or UAS platform) can connect to a gateway via a feeder link. The satellite can connect to a data network via a gateway. Beam footprint can mean the area from which signals transmitted by the satellite can be received. Referring to Figure 4, the satellite (or UAS platform) can generate a service link with the UE. A satellite (or UAS platform) connected to a UE can connect to other satellites (or UAS platforms) via ISLs (inter-satellite links). Other satellites (or UAS platforms) can connect to gateways via feeder links. Based on the regenerated payload, the satellite can connect to the data network via gateways with other satellites. If an ISL does not exist between satellites, a feeder link may be required between the satellite and the gateway. Figures 3 and 4 are merely examples of NTN scenarios, and NTN can implement various scenarios.For example, a satellite (or UAS platform) can implement a transparent or regenerative (with onboard processing) payload. For example, a satellite (or UAS platform) can generate various beams over a specified service area depending on the satellite's (or UAS platform's) field of view. For example, the satellite's (or UAS platform's) field of view may vary depending on the onboard antenna diagram and the elevation angle. For example, a transparent payload may include radio frequency filtering, frequency conversion, and amplification. Therefore, the waveform signal repeated by the payload may not be altered. For example, a regenerative payload may include radio frequency filtering, frequency conversion, and amplification, demodulation / decoding, switching and / or routing, coding / modulation. For example, a regenerative payload is substantially the same as mounting all or part of the base station functions on a satellite (or UAS platform).

[0053] - Integrated Sensing and Communication (ISAC): Wireless sensing is a technology that uses radio frequencies to determine the instantaneous linear velocity, angle, distance (range), etc., of an object, thereby obtaining information about the characteristics of the environment and / or objects within that environment. Because wireless frequency sensing does not require connection to an object via a device in the network, it can provide a service for determining object location without any device. The ability to obtain range, velocity, and angle information from wireless frequency signals can provide a wide range of new functions such as various object sensing, object recognition (e.g., vehicles, people, animals, UAVs), and high-precision location determination, tracking, and activity recognition. Wireless sensing services can provide information to various industries (e.g., unmanned aerial vehicles, smart homes, V2X, factories, railways, public safety, etc.) enabling applications such as intruder detection, control and navigation of auxiliary vehicles, trajectory tracking, collision avoidance, traffic management, and health and traffic management. In some cases, wireless sensing can use non-3GPP type sensors (e.g., radar, cameras) to further support 3GPP (registered trademark; hereafter the same) based sensing. For example, the operation of a wireless sensing service, i.e., sensing operation, can depend on the transmission, reflection, and scattering of wireless sensing signals. Therefore, wireless sensing can provide an opportunity to enhance existing communication systems with wireless and sensing networks in communication networks. Figure 5 shows an example of sensing operation according to one embodiment of the present disclosure. The embodiment of Figure 5 can be combined with various embodiments of the present disclosure. Specifically, Figure 5(a) shows an example of sensing using a sensing receiver and sensing transmitter located in the same position (e.g., monostatic sensing), and Figure 5(b) shows an example of sensing using a separated sensing receiver and sensing transmitter (e.g., bistatic sensing).

[0054] The layers of the Radio Interface Protocol (RRC) between a terminal and a network can be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based on the three lower layers of the Open System Interconnection (OSI) standard model, which is widely known in communication systems. Of these, the physical layer, which belongs to Layer 1, provides information transfer services using physical channels, while the Radio Resource Control (RRC) layer, located in Layer 3, plays the role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0055] The physical layer provides information transfer services to higher layers using physical channels. The physical layer is connected to the higher layer, the MAC (Medium Access Control) layer, via transport channels. Data moves between the MAC layer and the physical layer via these transport channels. Transport channels are classified according to how and with what characteristics data is transmitted via the wireless interface.

[0056] Data travels between different physical layers, i.e., between the physical layers of the transmitter and receiver, via a physical channel. This physical channel can be modulated using the OFDM (Orthogonal Frequency Division Multiplexing) method, utilizing time and frequency as wireless resources.

[0057] The MAC layer provides services to the higher-level RLC (radio link control) layer via logical channels. The MAC layer provides mapping functionality from multiple logical channels to multiple transport channels. Furthermore, the MAC layer provides logical channel multiplexing functionality through mapping from multiple logical channels to a single transport channel. The MAC sub-layer provides data transfer services on logical channels.

[0058] The RLC hierarchy performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To ensure the diverse Quality of Service (QoS) requirements of radio bearers (RBs), the RLC hierarchy provides three operating modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via ARQ (automatic repeat request).

[0059] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmit channels, and physical channels in relation to the configuration, reconfiguration, and release of radio bearers. RB refers to the 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 the terminal and the network.

[0060] The functions of the PDCP hierarchy on the user plane include the transmission of user data, header compression, and encryption. The functions of the PDCP hierarchy on the control plane include the transmission of control plane data and encryption / integrity protection.

[0061] The SDAP (Service Data Adaptation Protocol) layer is defined only at the user level. The SDAP layer performs tasks such as mapping QoS flows to data radio bearers and marking QoS flow identifiers (IDs) in downlink and uplink packets.

[0062] Setting up a Radio Bearing (RB) refers to the process of defining the characteristics of the radio protocol hierarchy and channel in order to provide a specific service, and setting the specific parameters and operating methods for each. Furthermore, RBs are divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). The SRB is used as a channel for transmitting RRC messages in the control plane, while the DRB is used as a channel for transmitting user data in the user plane.

[0063] When an RRC connection is established between the terminal's RRC layer and the base station's RRC layer, 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, in which a terminal in the RRC_INACTIVE state can maintain its connection with the core network and release its connection with the base station.

[0064] Downlink transport channels, which transmit data from the network to terminals, include BCH (Broadcast Channel) for transmitting system information and Downlink SCH (Shared Channel) for transmitting user traffic and control messages. Downlink multicast or broadcast service traffic or control messages can be transmitted via Downlink SCH or via a separate Downlink MCH (Multicast Channel). On the other hand, uplink transport channels, which transmit data from terminals to the network, include RACH (Random Access Channel) for transmitting initial control messages and Uplink SCH (Shared Channel) for transmitting user traffic and control messages.

[0065] Above the transport channel level, logical channels mapped to the transport channel include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic Channel).

[0066] Radio frames can be used for uplink and downlink transmissions. A radio frame has a length of 10ms and can be defined as two 5ms half-frames (HF). A half-frame can contain five 1ms subframes (SF). A subframe can be divided into one or more slots, and the number of slots within a subframe can be determined by the subcarrier spacing (SCS). Each slot can contain 12 or 14 OFDM(A) symbols by a cyclic prefix (CP).

[0067] When normal CP is used, each slot can contain 14 symbols. When extended CP is used, each slot can contain 12 symbols. Here, 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).

[0068] Table 2 below shows the number of symbols per slot (N) depending on the SCS setting (u) when a normal CP or extended CP is used. slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is an example.

[0069] [Table 2]

[0070] Figure 6 shows a frame slot structure according to one embodiment of the present disclosure. The embodiment in Figure 6 can be combined with various embodiments of the present disclosure.

[0071] Referring to Figure 6, a slot contains multiple symbols in the time domain. A carrier wave contains multiple subcarriers in the frequency domain. An RB (Resource Block) can be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A BWP (Bandwidth Part) can be defined as multiple consecutive (P)RBs ((Physical)Resource Blocks) in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier wave can contain up to N (e.g., 5) BWPs. Data communication can be performed via activated BWPs. Each element is called a Resource Element (RE) in the resource grid and can be mapped to a single complex symbol.

[0072] A Bandwidth Part (BWP) is a contiguous set of Physical Resource Blocks (PRBs) for a given numerology. PRBs can be selected from a contiguous subset of Common Resource Blocks (CRBs) for a given numerology on a given carrier.

[0073] Figure 7 shows an example of a BWP according to one embodiment of the present disclosure. The embodiment in Figure 7 can be combined with various embodiments of the present disclosure. In the embodiment of Figure 7, it is assumed that there are three BWPs.

[0074] Referring to Figure 7, the CRB (common resource block) is a carrier resource block numbered from one end of the carrier band to the other. The PRB is a resource block numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0075] BWP is point A, offset (N) from point A.start BWP ) and bandwidth (N size BWP ) can be set. For example, point A is an external reference point of the PRB of the carrier where sub-carrier 0 of all numerologies (e.g., 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 and point A for a given numerology. For example, the bandwidth is the number of PRBs for a given numerology.

[0076] The SLSS (Sidelink Synchronization Signal) is a sidelink (SL)-specific sequence and can include a PSSS (Primary Sidelink Synchronization Signal) and an 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-127 M-sequences can be used for the S-PSS, and length-127 Gold sequences can be used for the S-SSS. For example, a terminal can use the S-PSS to detect an initial signal and acquire synchronization. For example, a terminal can use the S-PSS and S-SSS to acquire detailed synchronization and detect a synchronization signal ID.

[0077] The PSBCH (Physical Sidelink Broadcast Channel) is a broadcast channel that transmits fundamental (system) information that terminals should know first before transmitting or receiving SL signals. For example, this fundamental information includes information related to SLSS, duplex mode (DM), TDDUL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool-related information, application types related to SLSS, subframe offset, and broadcast information. For example, to evaluate PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits, including a 24-bit CRC (Cyclic Redundancy Check).

[0078] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., an SLSS (Synchronization Signal) / PSBCH block, hereinafter referred to as S-SSB (Sidelink-Synchronization Signal Block)). The S-SSB can have the same numerology (i.e., SCS and CP lengths) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in the carrier, and its transmission bandwidth is within a (pre-configured) Sidelink Bandwidth Part (SL BWP). For example, the bandwidth of the S-SSB is 11RB (Resource Block). For example, the PSBCH spans 11RB. The frequency position of the S-SSB can be (pre-configured). Therefore, the terminal does not need to perform hypothesis detection on frequency to find the S-SSB in the carrier.

[0079] In this specification, PSCCH can be replaced with control channels, physical control channels, control channels associated with side links, physical control channels associated with side links, etc. In this specification, PSSCH can be replaced with shared channels, physical shared channels, shared channels associated with side links, physical shared channels associated with side links, etc.

[0080] Figure 8 illustrates a procedure in which a terminal performs V2X or SL communication according to a resource allocation mode, according to one embodiment of the present disclosure. The embodiment in Figure 8 can be combined with various embodiments of the present disclosure.

[0081] Referring to Figure 8(a), in resource allocation mode 1, the base station can schedule SL resources to be used by the terminal for SL transmission. For example, in step S800, the base station can transmit information related to the SL resources and / or information related to the UL resources to the first terminal. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0082] For example, the first terminal can receive from the base station information related to a DG (dynamic grant) resource and / or information related to a CG (configured grant) resource. For example, a CG resource may include a CG type 1 resource or a CG type 2 resource. In this specification, a DG resource may be a resource that the base station configures / assigns to the first terminal via DCI (downlink control information). In this specification, a CG resource may be a (periodic) resource that the base station configures / assigns to the first terminal via DCI and / or RRC messages. For example, in the case of a CG type 1 resource, the base station may send an RRC message containing information related to the CG resource to the first terminal. For example, in the case of a CG type 2 resource, the base station may send an RRC message containing information related to the CG resource to the first terminal, and the base station may send DCI related to the activation or release of the CG resource to the first terminal.

[0083] In step S810, the first terminal can transmit a 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 a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) associated with the PSCCH to the second terminal. In step S830, the first terminal can receive a PSFCH associated with the 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 may be information generated by the first terminal based on the HARQ feedback information received from the second terminal. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on pre-configured rules. For example, the DCI may be a DCI for scheduling SLs.

[0084] Referring to Figure 8(b), in resource allocation mode 2, the terminal can determine an SL transmission resource from the SL resources set by the base station / network or from the pre-configured SL resources. For example, the set SL resources or pre-configured SL resources may be a resource pool. For example, the terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can select resources itself from the configured resource pool and perform SL communication. For example, the terminal can perform sensing and resource (re)selection procedures and select resources itself within the selection window. For example, the sensing may be performed in units of subchannels. For example, in step S810, the first terminal that has selected resources itself from the resource pool can use those resources to send PSCCH (e.g., SCI (Sidelink Control Information) or 1 st -stage SCI) can be transmitted to the second terminal. In step S820, the first terminal transmits a PSSCH (e.g., 2) associated with the PSCCH. nd -Stage SCI, MAC PDU, data, etc. can be transmitted to the second terminal. In step S830, the first terminal can receive the PSFCH associated with the PSCCH / PSSCH from the second terminal.

[0085] Referring to Figure 8(a) or (b), for example, the first terminal can transmit an SCI over the PSCCH to the second terminal. Alternatively, for example, the first terminal can transmit two consecutive SCIs (e.g., a 2-stage SCI) over the PSCCH and / or PSSCH to the second terminal. In this case, the second terminal can decode the two consecutive SCIs (e.g., a 2-stage SCI) to receive the PSSCH from the first terminal. In this specification, an SCI transmitted over the PSCCH is 1 st SCI, 1st SCI, 1 st -stage SCI or 1 st -Stage SCI format, which can be called the SCI format, is transmitted over PSSCH. nd SCI, 2nd SCI, 2 nd-stage SCI or 2 nd - This can be called the stage SCI format.

[0086] For example, 1 st -stage SCI format can include SCI format 1-A and / or SCI format 1-B, 2 nd -stage SCI formats may include SCI format 2-A, SCI format 2-B, SCI format 2-C and / or SCI format 2-D.

[0087] The following is an example of SCI format 1-A.

[0088] SCI format 1-A is PSSCH and 2 on PSSCH nd - Used for scheduling SCI stages.

[0089] The following information will be transmitted using SCI Format 1-A.

[0090] -Priority-3 bits

[0091] -Frequency resource allocation- If the value of the higher-level parameter sl-MaxNumPerReserve is set to 2, ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, if the value of the higher-level parameter sl-MaxNumPerReserve is set to 3, ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0092] -Time resource allocation- 5 bits if the value of the higher-level parameter sl-MaxNumPerReserve is set to 2; otherwise, 9 bits if the value of the higher-level parameter sl-MaxNumPerReserve is set to 3.

[0093] -Resource reservation cycle -ceiling(log2N rsv_period ) bits, where N rsv_period This is the number of entries in the higher-level parameter sl-ResourceReservePeriodList if the higher-level parameter sl-MultiReserveResource is set; otherwise, 0 bits.

[0094] -DMRS pattern-ceiling(log2N) pattern ) bits, where N pattern This is the number of DMRS patterns set by the higher-level parameter sl-PSSCH-DMRS-TimePatternList.

[0095] -2 nd -stage SCI format-2bit

[0096] -Beta_OffsetIndicator- 2 bits as provided by the higher-level parameter sl-BetaOffsets2ndSCI

[0097] - Number of DMRS ports - 1 bit

[0098] -Modulation and coding method- 5-bit

[0099] - Additional MCS Table Indicator - 1 bit if one MCS table is set by the higher-level parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are set by the higher-level parameter sl-Additional-MCS-Table; 0 bits otherwise.

[0100] -PSFCH overhead indicator- If the upper-level parameter sl-PSFCH-Period=2 or 4, it is 1 bit; otherwise, it is 0 bits.

[0101] -Reserved bits- The number of bits determined by the higher-level parameter sl-NumReservedBits, and the value is set to 0.

[0102] The following is an example of SCI format 2-A.

[0103] In HARQ operation, if the HARQ-ACK information contains either an ACK or a NACK, or if the HARQ-ACK information contains only a NACK, or if there is no feedback of the HARQ-ACK information, SCI format 2-A is used for decoding the PSSCH.

[0104] The following information will be transmitted via SCI Format 2-A.

[0105] -HARQ process number-4 bits

[0106] - New data indicator - 1 bit

[0107] -Redundancy version-2 bits

[0108] -Source ID-8bit

[0109] - Destination ID - 16 bits

[0110] -HARQ Feedback Activation / Deactivation Indicator - 1 bit

[0111] -Cast type indicator- 2 bits as defined in Table 3

[0112] -CSI Request-1 bit

[0113] [Table 3]

[0114] The following is an example of SCI format 2-B.

[0115] In HARQ operation, if the HARQ-ACK information contains only NACK, or if there is no feedback of HARQ-ACK information, SCI format 2-B is used for PSSCH decoding.

[0116] The following information will be transmitted via SCI Format 2-B.

[0117] -HARQ process number-4 bits

[0118] - New data indicator - 1 bit

[0119] -Redundancy version-2 bits

[0120] -Source ID-8bit

[0121] - Destination ID - 16 bits

[0122] -HARQ Feedback Activation / Deactivation Indicator - 1 bit

[0123] - Zone ID - 12 bits

[0124] -Communication Range Requirements- 4 bits determined by the higher-level parameter sl-ZoneConfigMCR-Index

[0125] Referring to Figure 8(a) or (b), in step S830, the first terminal can receive the PSFCH. For example, the first and second terminals can determine the PSFCH resource, and the second terminal can use the PSFCH resource to send HARQ feedback to the first terminal.

[0126] Referring to Figure 8(a), in step S840, the first terminal can transmit SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0127] The following explains the HARQ (Hybrid Automatic Repeat Request) procedure.

[0128] For example, SL HARQ feedback can be enabled for unicasts. For example, SL HARQ feedback can be enabled for groupcasts. For example, two HARQ feedback options can be supported for groupcasts.

[0129] (1) Group cast option 1: If the receiving terminal fails to decode the transmission block associated with the PSCCH after it has decoded the PSCCH targeting the receiving terminal, the receiving terminal may send a NACK (negative acknowledgement) to the transmitting terminal via the PSFCH. On the other hand, if the receiving terminal decodes the PSCCH targeting the receiving terminal and successfully decodes the transmission block associated with the PSCCH, the receiving terminal may not send an ACK (positive acknowledgement) to the transmitting terminal.

[0130] (2) Group cast option 2: If the receiving terminal fails to decode the transmission block associated with the PSCCH after it has decoded the PSCCH targeting the receiving terminal, the receiving terminal may send a NACK to the transmitting terminal via the PSFCH. If the receiving terminal decodes the PSCCH targeting the receiving terminal and successfully decodes the transmission block associated with the PSCCH, the receiving terminal may send an ACK to the transmitting terminal via the PSFCH.

[0131] The following describes the UE procedure for reporting HARQ-ACK via sidelinks.

[0132] In response to receiving a PSSCH, the UE sends a PSFCH containing HARQ-ACK information. PSSCH subch The SCI format can be used to schedule PSSCH reception on one or more subchannels from a given subchannel. The UE provides HARQ-ACK information containing ACK, NACK, or NACK only.

[0133] The UE can receive the number of slots in the resource pool for PSFCH transmission occasion resources via sl-PSFCH-Period-r16. If the number is 0, PSFCH transmission from the UE is disabled in the resource pool. The UE is k mod N PSFCH PSSCH If = 0, slot t' k SL (0≦k <T′ max ) is expected to have PSFCH transmission opportunity resources, and here, t' k SL This is a slot belonging to the resource pool, and T′ max This is the number of slots belonging to the resource pool within 10240 msec, and N PSFCH PSSCHThis is provided in sl-PSFCH-Period-r16. The UE may be instructed by a higher level not to transmit a PSFCH in response to a PSSCH reception. If the UE receives a PSSCH in the resource pool and the HARQ feedback enabled / disallowed indicator field in the associated SCI format 2-A or SCI format 2-B has a value of 1, the UE provides HARQ-ACK information via a PSFCH transmission in the resource pool. The UE transmits a PSFCH in a first slot, where the first slot is a slot after the minimum number of slots provided by sl-MinTimeGapPSFCH-r16 in the resource pool that contains the PSFCH resource and has received the PSSCH since the last slot.

[0134] UE is a set of PRBs in the resource pool for PSFCH transmission with PRB in the resource pool. PSFCH PRB、set The subchannels are provided by sl-PSFCH-RB-Set-r16. The number of subchannels N for the resource pool provided by sl-NumSubchannel subch and N PSFCH PSSCH For a number of PSSCH slots associated with a smaller or the same PSFCH slot, the UE is M PRB、set PSFCH Among PRB [(i+j·N PSFCH PSSCH )·M PSFCH subch、slot 、(i+1+j·N PSFCH PSSCH )·M PSFCH subch、slot -1] PRB is assigned to slot i and subchannel j of the PSSCH slot which is linked to the PSFCH slot. Here, M PSFCH subch、slot =M PSFCH PRB、set / (N subch ·N PSFCH PSSCH ), 0≦i <N PSFCH PSSCH , 0≦j <N subchand the allocation starts in ascending order of i and continues in ascending order of j. The UE expects M PSFCH PRB、set to be a multiple of N subch ·N PSFCH PSSCH .

[0135] The UE determines the number of PSFCH resources R PSFCH PRB、CS =N PSFCH type ·M PSFCH subch、slot ·N PSFCH CS . Here, N PSFCH CS is the number of cyclic shift pairs for the resource pool and, based on an indication from a higher layer,

[0136] -N PSFCH type =1 and M PSFCH subch、slot PRBs are associated with the starting subchannel of the corresponding PSSCH,<*

[0137] -N PSFCH type =N PSSCH subch and N PSSCH subch ·M PSFCH subch、slot PRBs are associated with one or more of the N PSSCH subch subchannels of the corresponding PSSCH.

[0138] The PSFCH resources are first indexed in ascending order of the PRB index among the N PSFCH type ·M PSFCH subch、slot PRBs, and then indexed in ascending order of the cyclic shift pair index among the N PSFCH CS cyclic shift pairs.

[0139] The UE, in response to PSSCH reception, provides an index of the PSFCH resource for PSFCH transmission (P ID +M ID ) mod R PSFCH PRB、CS This is the decision. Here, P ID This is the physical hierarchy source ID provided by SCI format 2-A or 2-B for scheduling PSSCH reception, and M ID This is the ID of the UE that receives the PSSCH indicated in the higher layer if the UE detects an SCI format 2-A with a cast type indicator field value of "01", otherwise M ID It is 0.

[0140] UE uses Table 4 for N PSFCH CS The m0 value is determined for calculating the cyclic shift α value from the cyclic shift pair index corresponding to the PSFCH resource index.

[0141] [Table 4]

[0142] The UE applies one of the cyclic shift pairs to the sequence used for PSFCH transmission.

[0143] On the other hand, a set of non-contiguous RBs (equally spaced) is assigned to the UE (Unified Emission Unit) in terms of frequency. Such a set of non-contiguous RBs can be called interlaced RBs. This is useful in spectra where restrictions such as occupied channel bandwidth (OCB) and power spectral density (PSD) apply (for example, in shared spectra).

[0144] Figure 9 shows an interlaced RB according to one embodiment of the present disclosure. The embodiment of Figure 9 can be combined with various embodiments of the present disclosure.

[0145] Referring to Figure 9, multiple interlaces of RBs are defined in the frequency domain. An interlace m ∈ {0, 1, ..., M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M can represent the number of interlaced RBs given by Table 5.

[0146] [Table 5]

[0147] Communication devices (e.g., devices, UEs, vehicles, drones, etc., proposed through various embodiments of this disclosure) can transmit signals / channels using one or more interlaced RBs.

[0148] On the other hand, in the next-generation system, terminals may be able to perform sidelink transmission and / or reception operations in unlicensed bands. On the other hand, in the case of operation in unlicensed bands, depending on bandwidth regulations or requirements, channel sensing operations (e.g., energy detection / measurement) for the channel to be used may precede the terminal's transmission. The terminal may transmit in the unlicensed band only if the channel or RB set to be used is determined to be idle as a result of the channel sensing (e.g., the measured energy is below or less than a certain threshold). If the channel or RB set to be used is determined to be busy as a result of the channel sensing (e.g., the measured energy is above or above a certain threshold), the terminal may cancel all or part of the transmission in the unlicensed band. On the other hand, in operation in unlicensed bands, the terminal may omit or simplify the channel sensing operation (making the channel sensing interval relatively small) within a certain time period after transmission within a certain time interval. On the other hand, after a certain time has elapsed after transmission, the terminal may decide whether to transmit or not after performing normal channel sensing operations. On the other hand, in the case of transmission in an unlicensed band, depending on regulations or requirements, the size of the time interval and / or frequency occupied area and / or power spectral density (PSD) of the signal / channel transmitted by the terminal may each exceed a certain level. On the other hand, in an unlicensed band, in order to simplify channel sensing, the fact that a channel secured through initial normal channel sensing will be occupied for a certain period of time is notified via COT (channel occupancy time) interval information, and the maximum length of the COT interval can be set to differ depending on the priority value of the service or data packet or the channel access priority class (CAPC).

[0149] On the other hand, a base station can share the COT section it has secured via channel sensing via DCI transmission, and a terminal can perform a specific (instructed) channel sensing type and / or CP extension within the COT section based on the DCI information received from the base station. On the other hand, a terminal can again share the COT section it has secured via channel sensing with a base station that is the recipient of the terminal's UL transmission, and the relevant information is provided via UL through CG-UCI (configured grant-uplink control information). In the above situation, the base station can perform simplified channel sensing within the COT section shared by the terminal. On the other hand, in the case of sidelink communication, there are situations where the terminal is instructed by the base station via DCI or RRC signaling to use resources for sidelink transmission, such as in mode 1RA (resource allocation) operation, and there are operations where the terminal performs sidelink transmission and reception between terminals via sensing operations without the assistance of the base station, such as in mode 2RA operation.

[0150] On the other hand, for channel access type 1, which can be used regardless of the channel occupancy time (COT) setting, DL transmission is performed according to the procedure shown in Tables 6 and 7.

[0151] [Table 6]

[0152] [Table 7]

[0153] On the other hand, for channel access type 1, which can be used regardless of the channel occupancy time (COT) setting, UL transmission is performed according to the procedure shown in Tables 8 and 9.

[0154] [Table 8]

[0155] [Table 9]

[0156] On the other hand, a simplified channel access type 2 is used before transmission within the channel occupancy time (COT), and DL transmission is performed according to the procedure shown in Table 10.

[0157] [Table 10]

[0158] On the other hand, a simplified channel access type 2 is used before transmission within the channel occupancy time (COT), and UL transmission is performed according to the procedure shown in Table 11.

[0159] [Table 11]

[0160] In embodiments of this disclosure, TYPE 2 ASL channel access may be performed in a manner similar to TYPE 2 ADL and / or UL channel access. For example, TYPE 2 ASL channel access is performed in a sensing interval of T_short_sl=25us, the interval consisting of one sensing slot following a T_f=16us interval (duration), where T_f may include sensing slots in its beginning. Basic IDLE decisions in TYPE 2 ASL channel access can also borrow from IDLE decisions in DL or UL channel access.

[0161] In embodiments of this disclosure, TYPE 2 BSL channel access may be by methods such as TYPE 2 BDL and / or UL channel access. For example, TYPE 2 BSL channel access is configured in a sensing interval T_f = 16us, where T_f may include sensing slots in the last 9us. For example, in the case of TYPE 2 BSL channel access, a terminal can perform a transmission immediately after sensing an idle channel within the T_f = 16us interval (duration). T_f may include sensing slots occurring within the last 9us of T_f. Basic IDLE determination in TYPE 2 BSL channel access can also borrow from IDLE determination in DL or UL channel access.

[0162] In embodiments of this disclosure, TYPE 2 CSL channel access may be by means of TYPE 2 CDL and / or UL channel access. For example, in the case of TYPE 2 CSL channel access, the terminal does not perform channel sensing. Instead, the time interval for SL transmission may be up to 584us.

[0163] In embodiments of this disclosure, TYPE 1 SL channel access may be by methods such as TYPE 1 DL and / or UL channel access. For example, a terminal can derive a random integer value N based on the contention window size corresponding to a priority class. If the channel sensing result for a defer duration of size T_d corresponding to the priority class is idle, the terminal can decrement an N-1 counter value in units of T_sl if it is idle. If the counter value is 0, the terminal can occupy the RB set or channel that is the target of channel sensing. If some of the channel sensing results for the T_sl interval are determined to be busy, the terminal can maintain the counter value until the channel sensing result for another defer duration of size T_d is idle, and the terminal can continue to perform channel sensing. In the above, the defer duration of length T_d is composed of m_p consecutive T_sl intervals starting from T_f = 16us, where m_p is a value determined by the priority class (p), and T_sl = 9us may be the time interval in which channel sensing is performed.

[0164] The following explains CAPC (channel access priority class).

[0165] MACCE and the CAPC of the wireless bearer can be fixed or configured to operate in FR1:

[0166] - Padding (BSR) and recommended bit rate (MACCE) are fixed to the lowest priority;

[0167] - Fixed to have the highest priority for SRB0, SRB1, SRB3, and 6MACCE;

[0168] - Consists of base stations for SRB2 and DRB.

[0169] When selecting a CAPC for a DRB, the base station considers fairness between transmission and other traffic types while taking into account the 5QIs of all QoS flows multiplexed to that DRB. Table 12 shows which CAPC should be used for a given QoS flow, i.e., the CAPC to be used for a given QoS flow. For standardized 5QIs, the CAPC is defined as shown in the table below, and for non-standardized 5QIs, the CAPC with the most suitable QoS characteristics should be used.

[0170] [Table 12]

[0171] Table 13 shows that in DL, the channel connection priority class is m p This is an example where the minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are different.

[0172] [Table 13]

[0173] Table 13 defines the contentsion window size (CWS) and maximum COT values ​​for each CAPC. For example, T d =T f +m p *T sl It is possible.

[0174] Table 14 shows the channel connection priority class in UL.p This is an example where the minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are different.

[0175] [Table 14]

[0176] Table 14 defines the contentsion window size (CWS) and maximum COT values ​​for each CAPC. For example, T d =T f +m p *T sl It is possible.

[0177] In embodiments of this disclosure, there may be cases where a terminal is not ready to send a sidelink transmission while it has occupied a channel via TYPE1 SL channel access. In such cases, the terminal can set a defer duration of T_d length and a sensing interval of T_sl length immediately before a sidelink transmission that it is ready to send. If both are available, the terminal can immediately perform the sidelink transmission; if either is busy, the terminal can perform TYPE1 SL channel access again. For example, if it is difficult to send a sidelink transmission when channel sensing is completed (e.g., the end of channel sensing is after the start of the sidelink transmission), the terminal can re-select the sidelink transmission resource.

[0178] On the other hand, if two transmissions that start transmitting at the same time fail to recognize each other's transmissions, a collision may occur because both channels will judge the channel sensing results as idle. On the other hand, when the start time is randomly adjusted via CP extension and / or puncturing of one or more start symbols, some channels may be judged as busy during channel sensing for each transmission, which may cause problems in supporting FDM between different resources within the same RB set. On the other hand, in sidelink mode 2 resource (re)selection, the problem of transmission resources overlapping for different transmissions is avoided or mitigated by reserved resources indicated in previous transmissions.

[0179] On the other hand, to mitigate the problem of long delays due to channel sensing failures, various positions for the start symbol or start time within a slot can be permitted for sidelink communication, particularly for PSCCH / PSSCH transmissions.

[0180] Figure 10 illustrates the problem of increased delay time due to channel sensing failure. The embodiment in Figure 10 can be combined with various embodiments of this disclosure.

[0181] Referring to Figure 10, a terminal that has selected / reserved a resource on slot #1 can perform channel sensing before performing a transmit on the shared spectrum. If the terminal fails to perform channel sensing, it may not be permitted to perform an SL transmit using the resource selected / reserved on slot #1. In that case, since slots #2 through #7 are slots where communication is not permitted (e.g., slots not belonging to a resource pool), the failure of channel sensing can cause serious communication delays. This problem can become even more severe if slots where communication is not permitted (e.g., slots not belonging to a resource pool) are configured consecutively.

[0182] Therefore, to mitigate the problem of long delay times due to channel sensing failures, a variety of start symbol positions or start time positions within a slot are permitted for sidelink communication, particularly for PSCCH / PSSCH transmissions.

[0183] Figure 11 shows the positions of multiple start symbols or multiple start times within a slot according to one embodiment of the present disclosure. The embodiment in Figure 11 can be combined with various embodiments of the present disclosure.

[0184] Referring to Figure 11, the starting symbol positions within a slot can be set to symbols #A and #B. In this case, for example, the terminal can perform an SL transmission using symbols #A to the last symbol within the slot, or the terminal can perform an SL transmission using symbols #B to the last symbol within the slot.

[0185] On the other hand, candidate values ​​for the position of the starting symbol within the slot for PSCCH / PSSCH transmissions can be (pre-configured), and if no (pre-configuration) is set, a default value is used.

[0186] For example, it is possible to (pre-set) whether to use the position of additional start symbols for PSCCH / PSSCH transmissions and / or the number of start symbols for PSCCH / PSSCH transmissions (e.g., 1 or 2).

[0187] For example, if there is no (pre-)setting for the first starting symbol, the default value may be 0. For example, if there is no (pre-)setting for the SL symbol length (number of symbols), the default value may be 14. For example, the 14 may be limited to normal CP and / or the default value may be 12 when extended CP is used. For example, if there is no (pre-)setting for the second starting symbol, the default value may be 4 or 7. For example, the reference point for the value of the position of the second starting symbol may be the first symbol of the slot and / or the position of the first starting symbol.

[0188] For example, the (pre-)setting capability and / or value setting for the position of the first start symbol and / or the position of the second start symbol and / or the number of symbols can be applied differently to transmissions outside the COT and / or inside the COT and / or during COT initialization, and to transmissions at the last point in the COT. For example, during COT initialization, the (pre-)set value is used, and / or the default value is used inside the COT and / or at the last point in the COT. For example, the position of the first start symbol and / or the position of the second start symbol and / or the number of symbols and / or the position of the last symbol for each slot may differ and / or be (pre-)set depending on the CPE value between slots and / or the range of CPE values. For example, the CPE value and / or range of CPE values ​​for each slot may differ and / or be (pre-)set depending on the position of the first start symbol and / or the position of the second start symbol and / or the number of symbols and / or the position of the last symbol for each slot.

[0189] For example, in the above situation, the TBS (transport block size) calculation can be performed based on a (pre-)set number of symbols. For example, in the above situation, the TBS calculation can be determined based on the case where all symbols in the slot are available for SL. For example, in the above situation, when calculating the TBS, the length of the reference symbol interval can be (pre-)set and / or indicated in the SCI. For example, in the above situation, when calculating the TBS, the length of the reference symbol interval can be determined based on a (pre-)set first starting position. For example, in the above situation, when calculating the TBS, the length of the reference symbol interval can be determined based on a default value for the first starting position.

[0190] For example, the presence or absence of a PSFCH overhead indicator field and / or the size of the indicator field and / or the overhead value that can be indicated may differ from slot to slot and / or between slots where multiple start symbol start positions for PSCCH / PSSCH within a slot are allowed and other slots and / or between slots that contain PSFCH resources and slots that do not contain PSFCH resources. For example, in an SCI transmitted in a slot where a single start symbol position for a PSCCH / PSSCH in a slot is permitted, the PSFCH overhead indicator can indicate a value of 0 or 3 (at least when a PSFCH resource is set in the resource pool and / or when the PSFCH resource period exceeds 1), and / or in an SCI transmitted in a slot where multiple start symbol positions for a PSCCH / PSSCH in a slot are permitted, the PSFCH overhead indicator can indicate no PSFCH overhead (e.g., 0), / or PSFCH overhead exists (e.g., 3), and / or the sum of the symbol difference value between the second and first symbol start positions and / or the symbol difference value between the second and first symbol start positions plus PSFCH overhead (e.g., 3). For example, in the case of the PSFCH overhead indicator in an SCI transmitted in a slot where multiple start symbol positions for a PSCCH / PSSCH in a slot are permitted, the state for PSFCH overhead existing (e.g., 3) can be replaced by the symbol difference value between the second and first symbol start positions. For example, in SCI, the length of the reference symbol interval for PSCCH / PSSCH may differ depending on the PSFCH overhead indicator value. For instance, if the PSFCH overhead indicator value indicates no PSFCH overhead (e.g., 0), then in TBS calculation, the length of the reference symbol interval for PSCCH / PSSCH may be a separately (pre-set) value or the aforementioned (pre-set) value minus 2.For example, if the PSFCH overhead indicator value indicates that there is PSFCH overhead (e.g., 3), then in the TBS calculation, the length of the reference symbol interval for PSCCH / PSSCH may be the number of SL-Length Symbols available in the (pre-set) slot or the (pre-set) value minus 2.

[0191] For example, when performing an SCI or TBS calculation transmitted in a slot where a single-start symbol position for a PSCCH / PSSCH within the slot is permitted, the length of the reference symbol interval can be specified.

[0192] For example, if the initial transmission is sent in a slot where a single start symbol position for PSCCH / PSSCH within the slot is permitted, retransmissions for the same TB will only be sent in slots where a single start symbol position for PSCCH / PSSCH within the slot is permitted. For example, if the initial transmission is sent in a slot where multiple start symbol positions for PSCCH / PSSCH within the slot are permitted, retransmissions for the same TB will only be sent in slots where multiple start symbol positions for PSCCH / PSSCH within the slot are permitted.

[0193] In embodiments of this disclosure, a slot in which a single start symbol position for a PSCCH / PSSCH is permitted can be represented as a slot containing a PSFCH resource, and a slot in which multiple start symbol positions for a PSCCH / PSSCH are permitted can be represented as a slot not containing a PSFCH resource.

[0194] For example, when calculating TBS, the length of the reference symbol interval and / or the number of reference PRBs and / or the number of reference sub-channels and / or the number of reference interlaces can be (pre-)set and / or instructed to be joined by a single SCI instruction value.

[0195] On the other hand, the terminal can guarantee the same TB size for PSCCH / PSSCH transmissions that can have multiple startable symbols. Meanwhile, when calculating the TB size in sidelinks, the DMRS overhead uses the average value calculated based on (pre-)set values ​​in the resource pool, while the second SCI overhead uses the actual number of REs used.

[0196] For example, the TRIV (time resource indicator value) and / or FRIV (frequency resource indicator value) values ​​may be the same for different start symbols within a slot for PSCCH / PSSCH. For example, the FRIV values ​​may be different for different start symbols within a slot for PSCCH / PSSCH. For example, the combination of assigned RB sets(s) based on FRIV values ​​in the second start symbol may be the whole or a partial set of assigned RB sets(s) based on FRIV values ​​in the first start symbol. An advantage of this is that, after an LBT failure in the first start symbol, when attempting retransmission in the second start symbol, channel accessibility can be improved by reducing the number of RB sets. For example, when calculating TBS, the DMRS overhead used can be determined based on the intersection of the DMRS pattern sets available for the first start symbol and the DMRS pattern sets available for the second start symbol (in the resource pool). For example, if the available DMRS patterns for the first starting symbol are {2,3,4} and the available DMRS patterns for the second starting symbol are {2,3}, then the average DMRS overhead for their intersection, {2,3}, is used in the TBS calculation. For example, the DMRS overhead used in the TBS calculation can be determined based on the set of DMRS patterns available for the first starting symbol or the set of DMRS patterns available for the second starting symbol.

[0197] For example, the second SCI overhead can be maintained the same for different start symbols in a slot for PSCCH / PSSCH. For example, the beta offset indicator, which is RE number information for the second SCI, can indicate the same value in the first SCI transmitted based on different start symbols in a slot for PSCCH / PSSCH. For example, the upper limit of the mapping RE number for the second SCI for different start symbols in a slot for PSCCH / PSSCH can be determined based on the first start position and / or the second start position and / or the number of available SL symbols in the slot. For example, the PSFCH overhead indicator can indicate the same value for different start symbols in a slot for PSCCH / PSSCH. For example, the second SCI transmitted in a slot where different start symbols in a slot are permitted for PSCCH / PSSCH can always indicate the PSFCH overhead indicator as 0 (no PSFCH overhead).

[0198] For example, the second SCI overhead for different starting symbols within a slot for PSCCH / PSSCH can be determined independently and / or may differ. For example, when calculating TBS, the second SCI overhead to be referenced can be based on the length of a particular PSSCH symbol interval. For example, the length of the particular PSSCH symbol interval may be the first starting position and / or the second starting position and / or the number of available SL symbols in the slot and / or the (pre-)set or SCI-indicated starting position.

[0199] Table 15 shows an example of SL CBR (channel busy ratio).

[0200] [Table 15]

[0201] Table 16 shows an example of the SL RSSI (received signal strength indicator).

[0202] [Table 16]

[0203] Table 17 shows an example of SL CR (channel occupancy ratio).

[0204] [Table 17]

[0205] NOTE 1: a is a positive integer and b is 0 or a positive integer. a and b are determined by the upper layer parameter sl-TimeWindowSizeCR,b<(a+b+1) / 2, where a+b+1=1000 or 1000·2 u Determined by the UE implementation, n+b must not exceed the last transmission opportunity of the grant relative to the current transmission.

[0206] NOTE 2: SL CR is evaluated for each (re)transmission.

[0207] NOTE 3: When evaluating SL CR, the UE must assume that the transmit parameters used in slot n will be reused by existing grants in slot [n+1, n+b] without packet drop.

[0208] NOTE 4: The slot index is based on the physical slot index.

[0209] NOTE 5: SL CR can be calculated separately for each priority level.

[0210] NOTE 6: If a resource is a member of a selected sidelink grant, the resource is considered approved.

[0211] On the other hand, when performing RSSI measurements for congestion control, in time intervals where different start symbols within a slot are permitted for PSCCH / PSSCH, the interference environment may differ between time intervals where the first start position-based PSSCH and the second start position-based PSSCH overlap and time intervals where they do not overlap.

[0212] Figure 12 shows a method for measuring the channel congestion level when there is a first start symbol base transmission and a second start symbol base transmission, according to one embodiment of the present disclosure. The embodiment in Figure 12 can be combined with various embodiments of the present disclosure.

[0213] In the embodiment shown in Figure 12, for the sake of explanation, we assume that the measurement window [na, n-1] for the CBR measured in slot n includes five slots, and the resource pool includes two subchannels. If the terminal performs the CBR measurement based on a conventional CBR measurement method, the CBR measurement may be underestimated. Specifically, referring to Figure 12, if PSCCH / PSSCH transmissions are performed in the second and fifth slots based on the first start symbol, and PSCCH / PSSCH transmissions are performed in the first and third slots based on the second start symbol due to channel sensing failure, then the RSSI values ​​in the first and third slots can be measured as small. As a result, the channel congestion level is underestimated, and the terminal cannot efficiently perform operations such as adjusting physical parameters or power control based on the channel congestion level.

[0214] Therefore, for example, in slots where different start symbols within a slot are permitted for PSCCH / PSSCH, the terminal can measure RSSI and / or RSRP only in the second start position-based PSCCH / PSSCH transmission interval. In that case, for example, referring to Figure 12, the terminal can measure RSSI only in the second start position-based PSCCH / PSSCH transmission interval for all slots. Through this, problems such as underestimation of the channel congestion level due to channel sensing failures can be prevented, and the terminal can efficiently perform operations such as adjusting physical parameters and power control based on the channel congestion level.

[0215] For example, in slots where different starting symbols within a slot are permitted for at least PSCCH / PSSCH, the terminal can (pre) configure information for the symbol intervals for which RSSI and / or RSRP are measured, on a per-resource pool and / or per-slot basis. For example, in slots where different starting symbols within a slot are permitted for at least PSCCH / PSSCH, the terminal can measure RSSI and / or RSRP based on each starting position, and then determine / set the average and / or minimum and / or maximum values ​​for these measurements as the final RSSI and / or RSRP measurements.

[0216] For example, for a PSCCH / PSSCH transmission within a COT interval, the terminal can attempt to access the channel based on Type 2A or Type 2B (or Type 2C) for the first start (symbol) position, based on the time gap with the previous transmission. For example, if channel access to the first start (symbol) position fails, the terminal can continue the ongoing channel access procedure for the first start (symbol) position when attempting to access the second start (symbol) position. For example, if channel access to the first start (symbol) position fails, the terminal can use the Type 2A channel access procedure when attempting to access the second start (symbol) position.

[0217] On the other hand, depending on the capabilities of the terminal, the number of blind decodings (BD) for PSCCH that the terminal can perform within a slot and / or the number of PSSCH decoding attempts are limited. When allowing multiple start positions within a slot, the terminal can cancel detection attempts for some PSCCH and / or PSSCH or exclude them from the transmission candidates.

[0218] For example, the number of PSCCH candidates and / or the number of PSCCH BDs for the first start (symbol) position and the second start (symbol) position may be different. For example, the number of PSCCH candidates and / or the number of PSCCH BDs for the second start (symbol) position can be set / determined to be smaller than those for the first start (symbol) position. For example, when the terminal performs a PSCCH / PSSCH transmission attempt at the second start (symbol) position after a PSCCH / PSSCH transmission attempt fails at the first start (symbol) position, the respective lowest subchannels may be different. For example, the terminal can perform a channel access attempt for the second start (symbol) position only when all PSCCH / PSSCH transmission resources for the first start (symbol) position and the second start (symbol) position are secured (through a resource (re)selection process). For example, the terminal can execute a resource (re)selection process so that all PSCCH / PSSCH transmission resources for the first start (symbol) position and the second start (symbol) position are secured.

[0219] For example, (depending on the PSSCH decoding capability), when the terminal performs a PSSCH decoding attempt for the first start (symbol) position (when detecting the 1st SCI and / or when detecting the 2nd SCI and / or when the source ID and / or destination ID are matched), the terminal may not expect PSSCH decoding at the 2nd start (symbol) position. For example, (depending on the PSSCH decoding capability), the terminal can choose to preferentially decode the PSCCH / PSSCH at the first start (symbol) position and the second start (symbol) position based on priorities or CAPC, etc. For example, in the above, the terminal can preferentially attempt decoding for those with a smaller priority value.

[0220] For example, for a terminal that supports at least multiple PSCCH / PSSCH start positions within a slot, the UE capability can be extended and used. For example, the UE capability includes the number of HARQ processes, the number of PSSCH decoding times (such as the number of PRBs constituting the resource pool * scaling factor, where the scaling factor is a UE capability signaling and / or a pre-defined value).

[0221] For example, the position of the second start symbol in a slot for PSCCH / PSSCH can be (pre-configured) for each resource pool, and in this case, when a terminal receives a PSCCH / PSSCH, it can perform AGC operation for the position of the second start symbol for each resource pool. For example, whether or not the AGC operation can be performed can be determined by the implementation of the terminal, and / or if the terminal detects a PSCCH / PSSCH at the position of the first start symbol for a PSCCH / PSSCH reception for each resource pool, the position of the second start symbol for the corresponding resource pool can be excluded from the AGC operation. For example, the position of the second start symbol in a slot for PSCCH / PSSCH can be (pre-configured) for each resource pool, and in this case, the terminal can expect that the positions of the second symbols (pre-configured) for different resource pools are the same.

[0222] In embodiments of this disclosure, various methods can be applied differently depending on the CAPC value and / or the SL priority value and / or the (remaining) counter value of the Type 1 channel access procedure and / or the contention window size of the Type 1 channel access procedure.

[0223] Various embodiments of the present disclosure apply the method in such a way that the method differs depending on the SL channel and / or whether the PSCCH / PSSCH transmission is performed on a terminal, such as whether the transmission is outside or inside the COT.

[0224] Various embodiments of this disclosure apply the method in a way that differs depending on the SCS and / or the RB set and / or the RB set size.

[0225] In embodiments of this disclosure, a transmission located outside the COT can be interpreted as a transmission used during COT initialization and / or a transmission based on a Type 1 channel access procedure.

[0226] Embodiments of this disclosure may differ and / or be (pre-configured) by resource pool and / or external and / or internal transmission and / or by QoS parameter and / or CAPC and / or SL priority and / or internal or external COT (during COT initialization) and / or internal MCSt transmission procedure and / or SL channel type and / or RB set and / or SL BWP and / or SL carrier and / or congestion control level and / or transmit operation or receive operation and / or transmit power level and / or transmit start time and / or channel access procedure type for transmit and / or LBT failure rate and / or whether it is a COT initiator UE, a COT responded UE, or another UE and / or by cast type and / or whether SL HARQ-ACK feedback is activated and / or by HARQ-ACK feedback option and / or by the number of transmission attempts for the same information or TB. For example, in the embodiments of this disclosure, (pre-configuration) can be performed per resource pool and / or per transmission outside and / or inside the resource pool and / or per QoS parameter and / or per CAPC and / or per SL priority and / or per COT internal or external (when COT is initialized) and / or per MCSt internal transmission procedure and / or per SL channel type and / or per RB set and / or per SL BWP and / or per SL carrier and / or per congestion control level and / or per transmit operation or receive operation and / or per transmit power level and / or per transmit start time and / or per channel access procedure type for transmit and / or per LBT failure rate and / or per COT initiator UE, COT responded UE, or other UE and / or per cast type and / or per SL HARQ-ACK feedback activation and / or per HARQ-ACK feedback option and / or per number of transmit attempts for the same information or TB.

[0227] Figure 13 illustrates a method by which a first device performs wireless communication according to one embodiment of the present disclosure. The embodiment in Figure 13 can be combined with various embodiments of the present disclosure.

[0228] Referring to Figure 13, in step S1310, the first device can measure the SL (sidelink) RSSI (received signal strength indicator) across the CBR (channel busy ratio) measurement window in the resource pool. In step S1320, the first device can obtain the SL CBR based on the measurement. For example, based on the availability of a first start symbol and a second start symbol in a slot within the resource pool, the SL RSSI can be measured based on the position of the second start symbol.

[0229] For example, the second start symbol may be delayed compared to the first start symbol.

[0230] Furthermore, for example, the first device can acquire information related to the position of the first start symbol.

[0231] For example, based on the fact that no information related to the position of the first start symbol is set, the first start symbol may be the first symbol in the slot.

[0232] Furthermore, for example, the first device can acquire information related to the position of the second start symbol. For example, the SL RSSI measured based on the position of the second start symbol may be a linear average of the total received power observed in the subchannel set in the second start symbol of the slot in a subsequent OFDM (orthogonal frequency division multiplexing) symbol. For example, the subsequent OFDM symbol in the second start symbol may be an OFDM symbol that starts from the symbol following the second start symbol.

[0233] For example, the SL RSSI can be measured based on the position of the first start symbol, based on the fact that the first start symbol is permitted and the second start symbol is not permitted in the slot within the resource pool. For example, the SL RSSI measured based on the position of the first start symbol may be a linear average of the total received power observed in the subchannel set in the later OFDM (orthogonal frequency division multiplexing) symbol in the slot where the first start symbol is located. For example, the later OFDM symbol where the first start symbol is located may be an OFDM symbol that starts from the symbol following the first start symbol.

[0234] Furthermore, for example, the first device may execute a channel access procedure for transmission from the second start symbol based on a failure in the channel access procedure for transmission from the first start symbol. For example, the channel access procedure for transmission from the first start symbol and the channel access procedure for transmission from the second start symbol may be the same channel access procedure. For example, the channel access procedure for transmission from the first start symbol and the channel access procedure for transmission from the second start symbol may be a channel access procedure where the time interval spanning a sensing slot sensed to be idle before transmission is deterministic.

[0235] The proposed method can be applied to devices according to various embodiments of this disclosure. First, the processor 102 of the first device 100 can measure the SL (sidelink) RSSI (received signal strength indicator) across a CBR (channel busy ratio) measurement window in a resource pool. Then, the processor 102 of the first device 100 can obtain the SL CBR based on the measurement. For example, the SL RSSI can be measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are allowed in a slot in the resource pool.

[0236] According to one embodiment of the present disclosure, a first device configured to perform 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 the at least one processor for storing instructions. For example, based on the fact that the instructions are executed by the at least one processor, the first device may: measure the SL (sidelink) RSSI (received signal strength indicator) over a CBR (channel busy ratio) measurement window in a resource pool; and obtain the SL CBR based on the measurement. For example, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool, the SL RSSI may be measured based on the position of the second start symbol.

[0237] According to one embodiment of the present disclosure, a processing unit configured to control a first device is provided. For example, the processing unit may include at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the first device may be configured to: measure the SL (sidelink) RSSI (received signal strength indicator) across a CBR (channel busy ratio) measurement window in a resource pool, based on the instructions being executed by the at least one processor; and obtain the SL CBR based on the measurement. For example, the SL RSSI may be measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool.

[0238] According to one embodiment of the present disclosure, a non-temporary computer-readable storage medium recording instructions is provided. For example, when the instructions are executed, a first device may: measure the SL (sidelink) RSSI (received signal strength indicator) across a CBR (channel busy ratio) measurement window in a resource pool; and obtain the SL CBR based on the measurement. For example, the SL RSSI may be measured based on the position of the second start symbol, based on the availability of a first start symbol and a second start symbol in a slot in the resource pool.

[0239] Figure 14 illustrates a method by which a second device performs wireless communication according to one embodiment of the present disclosure. The embodiment in Figure 14 can be combined with various embodiments of the present disclosure.

[0240] Referring to FIG. 14, in step S1410, the second device can receive information related to SL (sidelink) CBR (channel busy ratio) from the first device. For example, the SL CBR can be obtained based on the SL RSSI (received signal strength indicator) measured over a CBR measurement window in a resource pool, and based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool, the SL RSSI can be measured based on the position of the second start symbol.

[0241] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor 202 of the second device 200 can control the transceiver 206 to receive information related to SL (sidelink) CBR (channel busy ratio) from the first device. For example, the SL CBR can be obtained based on the SL RSSI (received signal strength indicator) measured over a CBR measurement window in a resource pool, and based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool, the SL RSSI can be measured based on the position of the second start symbol.

[0242] According to one embodiment of the present disclosure, a second device configured to perform wireless communication is provided. For example, the second device may include at least one transceiver; at least one processor; and at least one memory connected to the at least one processor for storing instructions. For example, the second device may receive information related to the channel busy ratio (SL) from the first device based on the fact that the instructions are executed by the at least one processor. For example, the SL CBR may be obtained based on the received signal strength indicator (SL RSSI) measured across a CBR measurement window in a resource pool, and the SL RSSI may be measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot in the resource pool.

[0243] According to one embodiment of the present disclosure, a processing unit configured to control a second device is provided. For example, the processing unit may include at least one processor and at least one memory connected to the at least one processor for storing instructions. For example, the second device may receive information related to the channel busy ratio (SL) from the first device based on the fact that the instructions are executed by the at least one processor. For example, the SL CBR may be obtained based on the received signal strength indicator (SL RSSI) measured across a CBR measurement window in a resource pool, and the SL RSSI may be measured based on the position of the second start symbol based on the fact that a first start symbol and a second start symbol are allowed in a slot in the resource pool.

[0244] According to one embodiment of the present disclosure, a non-temporary computer-readable storage medium recording instructions is provided. For example, when the instructions are executed, a second device may receive information related to the channel busy ratio (SL) from the first device. For example, the SL CBR may be obtained based on the received signal strength indicator (SL RSSI) measured across a CBR measurement window in a resource pool, and the SL RSSI may be measured based on the position of the second start symbol, based on the availability of a first start symbol and a second start symbol in a slot within the resource pool.

[0245] According to various embodiments of this disclosure, CBR measurement in a slot where two candidate starting symbols are permitted can be performed relative to the second starting symbol. This improves the accuracy of CBR measurement for PSCCH / PSSCH with different starting positions and prevents problems such as underestimation of the channel congestion level due to channel sensing failures. Furthermore, the terminal can efficiently perform operations such as adjusting physical parameters and power control based on the channel congestion level.

[0246] Various embodiments of this disclosure can be combined with each other.

[0247] The following describes devices to which various embodiments of this disclosure apply.

[0248] Without limit, the various descriptions, functions, procedures, suggestions, methods and / or operation sequence diagrams disclosed in this document can be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0249] The following provides more specific examples with reference to the drawings. In the following drawings and descriptions, unless otherwise specified, the same or corresponding hardware blocks, software blocks, or functional blocks can be illustrated by the same reference numerals in the same drawings.

[0250] Figure 15 shows a communication system (1) according to one embodiment of the present disclosure. The embodiment in Figure 15 can be combined with various embodiments of the present disclosure.

[0251] Referring to Figure 15, the communication system (1) to which various embodiments of this disclosure apply includes wireless equipment, base stations, and networks. Here, wireless equipment means equipment that communicates using wireless connectivity technologies (e.g., 5G NR (New RAT), LTE (Long term evolution)), and can be called communication / wireless / 5G equipment. However, wireless equipment can include, but is not limited to, robots 100a, vehicles 100b-1, 100b-2, XR (eXtended Reality) equipment 100c, handheld devices 100d, home appliances 100e, IoT (Internet of Things) equipment 100f, and AI equipment / servers 400. For example, vehicles can include vehicles equipped with wireless communication capabilities, autonomous vehicles, and vehicles capable of vehicle-to-vehicle communication. Here, a vehicle can include a UAV (Unmanned aerial vehicle) (e.g., a drone) and / or an AV (Aerial Vehicle) (e.g., an AAM (Advanced Air Mobility)). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices and can be implemented in the form of HMDs (Head-Mounted Devices), HUDs (Head-Up Displays) mounted on vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Mobile devices can include smartphones, smart pads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., laptops, etc.). Home appliances can include TVs, refrigerators, washing machines, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and certain wireless devices 200a can operate as base stations / network nodes with other wireless devices.

[0252] Here, the wireless communication technologies implemented in the wireless devices 100a to 100f of this specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. In this case, for example, 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 names mentioned above. Furthermore, or generally, the wireless communication technologies implemented in the wireless devices 100a to 100f of this specification can communicate based on LTE-M technology. In this case, for example, LTE-M technology is an example of LPWAN technology and is called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology can be implemented in at least 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 names mentioned above. Furthermore, the wireless communication technologies implemented in the wireless devices 100a to 100f of this specification may include, or generally may not include, at least one of ZigBee, Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN), which take low-power communication into consideration. For example, Zigbee technology can generate personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and is known by various names.

[0253] Wireless devices 100a to 100f can be connected to the network 300 via the base station 200. Artificial Intelligence (AI) technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can be connected to the AI ​​server 400 via the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but they 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). Furthermore, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0254] Wireless communication / connection 150a, 150b, and 150c can be performed between wireless devices 100a-100f / base station 200 and between base stations 200 / base station 200. Here, wireless communication / connection can be performed via uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul), or various other wireless connectivity technologies (e.g., 5G NR)). Wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals from each other via wireless communication / connection 150a, 150b, and 150c. For example, wireless communication / connection 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, at least some of the following can be performed based on the various proposals of this disclosure: various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc.

[0255] Figure 16 shows a wireless device according to one embodiment of the present disclosure. The embodiment in Figure 16 can be combined with various embodiments of the present disclosure.

[0256] Referring to Figure 16, the first radio device 100 and the second radio device 200 can transmit and receive radio signals via various radio connectivity technologies (e.g., LTE, NR). Here, {first radio device 100, second radio device 200} can correspond to {radio device 100x, base station 200} and / or {radio device 100x, radio device 100x} in Figure 15.

[0257] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memories 104 and / or the transceivers 106 and be configured to embody the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signals and then transmit a wireless signal containing the first information / signals via the transceiver 106. Alternatively, the processor 102 may receive a wireless signal containing second information / signals via the transceiver 106 and then store information obtained from signal processing of the second information / signals in the memory 104. The memory 104 may be linked to the processor 102 and may store various information related to the operation of the processor 102. For example, memory 104 may store software code that includes instructions for executing some or all of the processes controlled by processor 102, or for executing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Here, processor 102 and memory 104 are part of a communication modem / circuit / chip designed to embody wireless communication technology (e.g., LTE, NR). Transceiver 106 may be coupled with processor 102 and may transmit and / or receive radio signals via one or more antennas 108. Transceiver 106 may include a transmitter and / or receiver. Transceiver 106 may be used in combination with an RF (Radio Frequency) unit. In this disclosure, wireless equipment may also mean a communication modem / circuit / chip.

[0258] The second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memories 204 and / or the transceivers 206 and be configured to embody the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signals and then transmit a wireless signal containing the third information / signals via the transceiver 206. Alternatively, the processor 202 may receive a wireless signal containing fourth information / signals via the transceiver 206 and then store information obtained from signal processing of the fourth information / signals in the memory 204. The memory 204 may be linked to the processor 202 and may store various information related to the operation of the processor 202. For example, memory 204 may store software code containing instructions for executing some or all of the processes controlled by processor 202, or for executing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Here, processor 202 and memory 204 are part of a communication modem / circuit / chip designed to embody wireless communication technology (e.g., LTE, NR). Transceiver 206 may be coupled with processor 202 and may transmit and / or receive radio signals via one or more antennas 208. Transceiver 206 may include a transmitter and / or receiver and may be used in combination with an RF unit. In this disclosure, wireless equipment may also mean a communication modem / circuit / chip.

[0259] The hardware elements of wireless devices 100 and 200 will be described in more detail below. However, one or more protocol layers can be embodied by one or more processors 102 and 202. For example, one or more processors 102 and 202 can embodied one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and 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) by means of the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 can generate messages, control information, data, or information by means of the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document. One or more processors 102, 202 can generate signals (e.g., baseband signals) containing PDUs, SDUs, messages, control information, data, or information by means of the functions, procedures, suggestions, and / or methods disclosed in this document and provide them to one or more transceivers 106, 206. One or more processors 102, 202 can receive signals (e.g., baseband signals) from one or more transceivers 106, 206 and acquire PDUs, SDUs, messages, control information, data, or information by means of the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed in this document.

[0260] One or more processors 102, 202 are referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102, 202 can be embodied by hardware, firmware, software, or a combination thereof. For 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) may be included in one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be embodied using firmware or software, and the firmware or software may be embodied to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be implemented by one or more processors 102, 202, or stored in one or more memories 104, 204 and driven by one or more processors 102, 202, with firmware or software configured to execute them. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions and / or sets of instructions.

[0261] One or more memory units 104, 204 can be connected to one or more processors 102, 202 and can store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memory units 104, 204 can consist of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer read / store media, and / or combinations thereof. One or more memory units 104, 204 can be located inside and / or outside of one or more processors 102, 202. Furthermore, one or more memory units 104, 204 can be connected to one or more processors 102, 202 via various technologies such as wired or wireless connections.

[0262] One or more transceivers 106, 206 can transmit user data, control information, radio signals / channels, etc., as referred to in the methods and / or operational flowcharts, etc., described herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 can be connected to one or more processors 102, 202 to transmit and receive radio signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information or radio 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 radio signals from one or more other devices. Furthermore, one or more transceivers 106, 206 can be connected to one or more antennas 108, 208 and configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein, via one or more antennas 108, 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 can convert received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102, 202. One or more transceivers 106, 206 can convert user data, control information, radio 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 may include (analog) oscillators and / or filters.

[0263] Figure 17 shows a signal processing circuit for a transmitted signal according to one embodiment of the present disclosure. The embodiment in Figure 17 can be combined with various embodiments of the present disclosure.

[0264] Referring to Figure 17, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. However, it is not limited to these, and the operation / function of Figure 17 can be performed by the processors 102, 202 and / or transceivers 106, 206 of Figure 16. The hardware elements of Figure 17 can be embodied by the processors 102, 202 and / or transceivers 106, 206 of Figure 16. For example, blocks 1010-1060 can be embodied by the processors 102, 202 of Figure 16. Also, blocks 1010-1050 can be embodied by the processors 102, 202 of Figure 16, and block 1060 can be embodied by the transceivers 106, 206 of Figure 16.

[0265] The codeword can be converted into a radio signal via the signal processing circuit 1000 in Figure 17. Here, the codeword is an encoded bit sequence of information blocks. The information blocks may include transmission blocks (e.g., UL-SCH transmission block, DL-SCH transmission block). The radio signal can be transmitted via various physical channels (e.g., PUSCH, PDSCH).

[0266] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambled sequence used for scrambling is generated based on an initialization value, which may include the ID information of the radio equipment. The scrambled bit sequence can be modulated into a modulated symbol sequence by the modulator 1020. The modulation scheme can include pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), etc. The complex modulated symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulated symbol of each transmission layer can be mapped to the corresponding antenna port (ra) 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. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT transformation) on the complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0267] The resource mapper 1050 can map the modulation symbols of each antenna port to a time-frequency resource. The time-frequency resource may include multiple symbols in the time domain (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) and multiple 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. To this end, the signal generator 1060 may include an IFFT (Inverse Fast Fourier Transform) module, a CP (Cyclic Prefix) inserter, a DAC (Digital-to-Analog Converter), a frequency uplink converter, and the like.

[0268] In wireless equipment, the signal processing process for a received signal can be configured as the reverse of the signal processing processes 1010-1060 in Figure 17. For example, wireless equipment (e.g., 100, 200 in Figure 16) can receive wireless signals from an external source via an antenna port / transceiver. The received wireless signal can be converted into a baseband signal via a signal restorer. For this purpose, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Subsequently, the baseband signal can be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descramble process. The codeword can be decoded to restore the original information blocks. Therefore, a signal processing circuit (not shown) for a received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0269] Figure 18 shows a wireless device according to one embodiment of the present disclosure. The wireless device can be implemented in a variety of forms depending on the use-example / service (see Figure 15). The embodiment in Figure 18 can be combined with various embodiments of the present disclosure.

[0270] Referring to Figure 18, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 in Figure 16 and can be composed of various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and transceivers (etc.) 114. For example, the communication circuit 112 may include one or more processors 102, 202 and / or one or more memories 104, 204 in Figure 15. For example, the transceivers (etc.) 114 may include one or more transceivers 106, 206 and / or one or more antennas 108, 208 in Figure 16. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls the various operations of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / instructions / information stored in the memory unit 130. The control unit 120 can also transmit the information stored in the memory unit 130 to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110, or store information received from an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110 in the memory unit 130.

[0271] The additional element 140 can be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of the following: a power unit / battery, an input / output unit (I / O unit), a drive unit, and a computing unit. However, wireless devices can be embodied in forms such as robots (100a in Figure 15), vehicles (100b-1, 100b-2 in Figure 15), XR devices (100c in Figure 15), mobile devices (100d in Figure 15), home appliances (100e in Figure 15), IoT devices (100f in Figure 15), digital broadcasting terminals, hologram devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices (400 in Figure 15), base stations (200 in Figure 15), and network nodes. Depending on the use-example / service, wireless devices may be mobile or used in a fixed location.

[0272] In Figure 18, the various elements, components, units / parts, and / or modules within the wireless devices 100 and 200 can be interconnected as a whole via a wired interface, or at least some of them can be connected 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 via a wired interface, and the control unit 120 and the first units (e.g., 130, 140) can be connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / part, and / or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may consist of a collection of one or more processors. For example, the control unit 120 may consist of a collection of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processing processor, a memory control processor, and so on. As another example, the memory unit 130 may consist of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0273] The following provides a more detailed explanation of the example shown in Figure 18, with reference to other drawings.

[0274] Figure 19 shows a portable device according to one embodiment of the present disclosure. The portable device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch, smart glass), or a portable computer (e.g., a laptop computer). The portable device may be referred to as an MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), or WT (Wireless terminal). The embodiment in Figure 19 can be combined with various embodiments of the present disclosure.

[0275] Referring to Figure 19, the portable device 100 may 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 may be composed of a part of the communication unit 110. Blocks 110-130 / 140a-140c correspond to blocks 110-130 / 140 in Figure 18, respectively.

[0276] The communication unit 110 can send and receive signals (e.g., data, control signals, etc.) with other wireless devices and base stations. The control unit 120 can control the components of the portable device 100 and perform various operations. The control unit 120 may include an AP (Application Processor). The memory unit 130 can store data / parameters / programs / code / instructions necessary to operate the portable device 100. The memory unit 130 can also store input / output data / information, etc. The power supply unit 140a supplies power to the portable device 100 and may include wired / wireless charging circuits, batteries, etc. The interface unit 140b can support the connection of the portable device 100 with other external devices. The interface unit 140b may include various ports for connection with external devices (e.g., audio input / output ports, video input / output ports). The input / output unit 140c can receive and output video information / signals, audio information / signals, data, and / or information input from the user. The input / output section 140c may include a camera, microphone, user input section, display section 140d, speaker and / or haptic module, etc.

[0277] For example, in the case of data communication, the input / output unit 140c acquires information / signals input from the user (e.g., touch, text, voice, image, video), and the acquired information / signals can be stored in the memory unit 130. The communication unit 110 converts the information / signals stored in memory into a radio signal and can transmit the converted radio signal directly to other radio devices or to a base station. Furthermore, after receiving a radio signal from another radio device or base station, the communication unit 110 can restore the received radio signal to its original information / signal. The restored information / signal is stored in the memory unit 130 and can then be output via the input / output unit 140c in various forms (e.g., text, voice, image, video, haptic).

[0278] Figure 20 shows a vehicle or autonomous vehicle according to one embodiment of the present disclosure. The vehicle or autonomous vehicle can be implemented as a mobile robot, a vehicle, a train, a manned or unmanned aerial vehicle (AV), a ship, etc. The embodiment in Figure 20 can be combined with various embodiments of the present disclosure.

[0279] Referring to Figure 20, the vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be composed of part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in Figure 18, respectively.

[0280] The communication unit 110 can send and receive signals (e.g., 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 elements of the vehicle or autonomous vehicle 100 and perform various operations. The control unit 120 may include an ECU (Electronic Control Unit). The drive unit 140a can make the vehicle or autonomous vehicle 100 travel on the ground. The drive unit 140a may include an engine, motor, powertrain, wheels, brakes, steering system, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and may include a wired / wireless charging circuit, battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an IMU (inertial measurement unit) sensor, collision sensor, wheel sensor, speed sensor, tilt sensor, weight detection sensor, heading sensor, position module, vehicle forward / reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illuminance sensor, pedal position sensor, etc. The autonomous driving unit 140d can implement technologies such as maintaining a lane while driving, automatically adjusting speed like adaptive cruise control, automatically driving along a predetermined route, and automatically setting a route and driving when a destination is set.

[0281] For example, the communication unit 110 can receive map data, traffic information data, etc., from an external server. The autonomous driving unit 140d can generate an autonomous driving route and driving plan based on the acquired data. The control unit 120 can control the drive unit 140a so that the vehicle or autonomous 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 acquire the latest traffic information data from the external server non-periodically and acquire surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c can acquire vehicle status and surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and driving plan based on the newly acquired data / information. The communication unit 110 can transmit information such as vehicle position, autonomous driving route, and driving plan 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 autonomous vehicle, and can provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0282] The claims described herein can be combined in various ways. For example, the technical features of the method claims herein can be combined and embodied in an apparatus, and the technical features of the apparatus claims herein can be combined and embodied in a method. Furthermore, the technical features of the method claims and the technical features of the apparatus claims herein can be combined and embodied in an apparatus, and the technical features of the method claims and the technical features of the apparatus claims herein can be combined and embodied in a method.

[0283] [Claims when filing an international application] [Claim 1] A method by which the first device performs wireless communication, The steps of measuring the SL (sidelink) RSSI (received signal strength indicator) across the CBR (channel disturbance ratio) measurement window in the resource pool; and The step of obtaining the SL CBR based on the measurement; A method in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool. [Claim 2] The method according to claim 1, wherein the second start symbol is later than the first start symbol. [Claim 3] The method according to claim 1, further comprising the step of obtaining information relating to the position of the first start symbol; [Claim 4] The method according to claim 1, wherein, based on the fact that no information relating to the position of the first start symbol is set, the first start symbol is the first symbol in the slot. [Claim 5] The method according to claim 1, further comprising the step of obtaining information relating to the position of the second start symbol; [Claim 6] The method according to claim 5, wherein the SL RSSI measured based on the position of the second start symbol is a linear average of the total received power observed in the subchannel set in the OFDM (orthogonal frequency division multiplexing) symbol after the second start symbol of the slot. [Claim 7] The method according to claim 6, wherein the OFDM symbol after the second start symbol is an OFDM symbol that starts from the symbol following the second start symbol. [Claim 8] The method according to claim 1, wherein the SL RSSI is measured based on the position of the first start symbol, based on the fact that the first start symbol is permitted and the second start symbol is not permitted in the slot within the resource pool. [Claim 9] The method according to claim 8, wherein the SL RSSI measured based on the position of the first start symbol is a linear average of the total received power observed in the subchannel set in the OFDM (orthogonal frequency division multiplexing) symbol after the first start symbol of the slot. [Claim 10] The method according to claim 9, wherein the OFDM symbol after the first start symbol is an OFDM symbol that starts from the symbol following the first start symbol. [Claim 11] The method according to claim 1, further comprising the step of performing a channel access procedure for transmission from a second start symbol based on the failure of the channel access procedure for transmission from the first start symbol; [Claim 12] The method according to claim 11, wherein the channel access procedure for transmission from the first start symbol and the channel access procedure for transmission from the second start symbol are the same channel access procedure. [Claim 13] The method according to claim 11, wherein the channel access procedure for transmission from the first start symbol and the channel access procedure for transmission from the second start symbol are channel access procedures that are deterministic in that they span a time interval that spans a sensing slot sensed to be idle before transmission. [Claim 14] A first device configured to perform wireless communication, At least one transceiver; at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction is to cause the first device to perform an operation based on the fact that it is executed by the at least one processor. The aforementioned operation is, In the resource pool, measure the SL (sidelink) RSSI (received signal strength indicator) across the CBR (channel disturbance ratio) measurement window; and Based on the above measurement, the SL CBR is obtained; A first device in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool. [Claim 15] A processing device configured to control the first device, at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction is to cause the first device to perform an operation based on the fact that it is executed by the at least one processor. The aforementioned operation is, In the resource pool, measure the SL (sidelink) RSSI (received signal strength indicator) across the CBR (channel disturbance ratio) measurement window; and Based on the above measurement, the SL CBR is obtained; A processing unit in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool. [Claim 16] A non-temporary computer-readable storage medium that records instructions, The aforementioned instruction, when executed, causes the first device to perform an action. The aforementioned operation is, In the resource pool, measure the SL (sidelink) RSSI (received signal strength indicator) across the CBR (channel disturbance ratio) measurement window; and Based on the above measurement, the SL CBR is obtained; A non-temporary computer-readable storage medium in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool. [Claim 17] A method by which the second device performs wireless communication, The process includes the step of receiving information related to SL (sidelink) CBR (channel busy ratio) from a first device; The aforementioned SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured across the CBR measurement window in the resource pool, and A method in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool. [Claim 18] A second device configured to perform wireless communication, At least one transceiver; at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction causes the second device to perform an operation based on the fact that it is executed by at least one processor. The aforementioned operation involves receiving information related to SL (sidelink) CBR (channel busy ratio) from the first device; The aforementioned SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured across the CBR measurement window in the resource pool, and A second device in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool. [Claim 19] A processing device configured to control a second device, at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction causes the second device to perform an operation based on the execution of the at least one processor, The aforementioned operation involves receiving information related to SL (sidelink) CBR (channel busy ratio) from the first device; The aforementioned SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured across the CBR measurement window in the resource pool, and A processing unit in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool. [Claim 20] As a non-temporary computer-readable storage medium that records instructions, The aforementioned instruction, when executed, causes the second device to perform an action. The aforementioned operation involves receiving information related to SL (sidelink) CBR (channel busy ratio) from the first device; The aforementioned SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured across the CBR measurement window in the resource pool, and A non-temporary computer-readable storage medium in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool.

Claims

1. A method by which the first device performs wireless communication, The steps of measuring the SL (sidelink) RSSI (received signal strength indicator) across a CBR (channel busy ratio) measurement window in a resource pool; and The step of obtaining SL CBR based on the measurement; A method in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool.

2. The method according to claim 1, wherein the second start symbol is later than the first start symbol.

3. The method according to claim 1, further comprising the step of obtaining information relating to the position of the first start symbol;

4. The method according to claim 1, wherein, based on the fact that no information relating to the position of the first start symbol is set, the first start symbol is the first symbol in the slot.

5. The method according to claim 1, further comprising the step of obtaining information relating to the position of the second start symbol;

6. The method according to claim 5, wherein the SL RSSI measured based on the position of the second start symbol is a linear average of the total received power observed in the subchannel set in the OFDM (orthogonal frequency division multiplicing) symbol after the second start symbol of the slot.

7. The method according to claim 6, wherein the OFDM symbol after the second start symbol is an OFDM symbol that starts from the symbol following the second start symbol.

8. The method according to claim 1, wherein the SL RSSI is measured based on the position of the first start symbol, based on the fact that the first start symbol is permitted and the second start symbol is not permitted in the slot within the resource pool.

9. The method according to claim 8, wherein the SL RSSI measured based on the position of the first start symbol is a linear average of the total received power observed in the subchannel set in the OFDM (orthogonal frequency division multiplexing) symbol after the first start symbol of the slot.

10. The method according to claim 9, wherein the OFDM symbol after the first start symbol is an OFDM symbol that starts from the symbol following the first start symbol.

11. The method according to claim 1, further comprising the step of performing a channel access procedure for transmission from a second start symbol based on the failure of the channel access procedure for transmission from the first start symbol.

12. The method according to claim 11, wherein the channel access procedure for transmission from the first start symbol and the channel access procedure for transmission from the second start symbol are the same channel access procedure.

13. The method according to claim 11, wherein the channel access procedure for transmission from the first start symbol and the channel access procedure for transmission from the second start symbol are channel access procedures that are determined by a time interval spanning a sensing slot that was sensed to be idle before transmission.

14. A first device configured to perform wireless communication, At least one transceiver; at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction is to cause the first device to perform an operation based on the fact that it is executed by the at least one processor. The aforementioned operation is, In the resource pool, measure the SL (sidelink) RSSI (received signal strength indicator) over the CBR (channel busy ratio) measurement window; and Based on the above measurement, the SL CBR is obtained; The first device, where the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool.

15. A processing apparatus configured to control the first device, at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction is to cause the first device to perform an operation based on the fact that it is executed by the at least one processor. The aforementioned operation is, In the resource pool, measure the SL (sidelink) RSSI (received signal strength indicator) over the CBR (channel busy ratio) measurement window; and Based on the above measurement, the SL CBR is obtained; A processing unit in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool.

16. A non-temporary computer-readable storage medium that records instructions, The aforementioned instruction, when executed, causes the first device to perform an action. The aforementioned operation is, In the resource pool, measure the SL (sidelink) RSSI (received signal strength indicator) over the CBR (channel busy ratio) measurement window; and Based on the above measurement, the SL CBR is obtained; A non-temporary computer-readable storage medium in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool.

17. A method by which the second device performs wireless communication, The process includes the step of receiving information related to SL (sidelink) CBR (channel busy ratio) from a first device; The SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured over the CBR measurement window in the resource pool, and A method in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool.

18. A second device configured to perform wireless communication, At least one transceiver; at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The instruction is to cause the second device to perform an operation based on the fact that it is executed by the at least one processor. The aforementioned operation involves receiving information related to SL (sidelink) CBR (channel busy ratio) from the first device; The SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured over the CBR measurement window in the resource pool, and A second device in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool.

19. A processing device configured to control a second device, at least one processor; and The system comprises at least one memory connected to the at least one processor and storing instructions; The aforementioned instruction causes the second device to perform an operation based on the execution of the at least one processor, The aforementioned operation involves receiving information related to SL (sidelink) CBR (channel busy ratio) from the first device; The SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured over the CBR measurement window in the resource pool, and A processing unit in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in the slots within the resource pool.

20. As a non-temporary computer-readable storage medium that records instructions, The aforementioned instruction, when executed, causes the second device to perform an action. The aforementioned operation involves receiving information related to SL (sidelink) CBR (channel busy ratio) from the first device; The SL CBR is obtained based on the SL RSSI (received signal strength indicator) measured over the CBR measurement window in the resource pool, and A non-temporary computer-readable storage medium in which the SL RSSI is measured based on the position of the second start symbol, based on the fact that a first start symbol and a second start symbol are permitted in a slot within the resource pool.

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