Method, communication device, and storage medium for transmitting wireless channel, and method, communication device, and storage medium for receiving wireless channel

Abstract

In the present specification, second control information of a second physical control channel transmitted within a second resource reserved by a first control information format carried by a first physical control channel may include information on whether a third resource reserved by the first control information format is available for transmission.

Description

Method for transmitting a wireless channel, communication device and storage medium, and method for receiving a wireless channel, communication device and storage medium

[0001] This specification relates to wireless communication systems.

[0002] Various devices and technologies, such as machine-to-machine (M2M) communication, machine-type communication (MTC), and smartphones and tablet PCs (personal computers) that require high data transmission rates, are emerging and becoming widespread. Consequently, the amount of data required to be processed on cellular networks is rapidly increasing. To meet this rapidly increasing data processing demand, technologies such as carrier aggregation and cognitive radio are being developed to efficiently utilize more frequency bands, while multi-antenna technology and multi-base station (BS) cooperation technology are being developed to increase the data capacity transmitted within a limited frequency range.

[0003] Wireless communication systems utilize available system resources (e.g., bandwidth, transmission power, etc.) to support communication between user equipment (UEs). With the introduction of new wireless communication technologies, not only has the number of UEs that a base station (BS) must service within a given resource area increased, but so has the volume of data and control information transmitted and received by the BS to and from the UEs it serves. Since the amount of wireless resources available to a BS for communication with UE(s) is finite, a new method is needed for the BS to efficiently receive and transmit uplink / downlink data and / or uplink / downlink control information to / from the UE(s) using these limited wireless resources. In other words, as node density and / or UE density increase, methods for efficiently utilizing high-density nodes or high-density UEs for communication have become necessary. For example, to address the burden on BSs due to rapidly increasing data traffic, direct communication between two or more nearby UEs using wireless communication technologies, bypassing network nodes, has been studied. As the need for V2X (vehicle-to-everything), a communication technology that supports wired and wireless communication between vehicles and other vehicles, infrastructure, networks, or pedestrians, arises, a rapid increase in communication between devices is expected.

[0004] Considering the rapidly increasing volume and frequency of communication between devices, a solution is required to support stable communication between devices.

[0005] The technical tasks that this specification aims to achieve are not limited to the technical tasks mentioned above, and other technical tasks that are not mentioned will be clearly understood by those skilled in the art related to this specification from the detailed description below.

[0006] In one aspect of the present disclosure, a method for transmitting a wireless channel by a communication device in a wireless communication system is provided. The method comprises: determining a first resource, a second resource, and a third resource for wireless communication within a resource pool on a cell; generating a first control information format including time information regarding the second resource and the third resource; transmitting a first physical control channel carrying the first control information format and an associated first physical shared channel within the first resource; and transmitting a second physical control channel carrying a second control information format and an associated second physical shared channel within the second resource, the second control information format including information regarding availability of the third resource; and determining whether to perform wireless channel transmission on the third resource based on the information regarding availability of the third resource.

[0007] In another aspect of the present disclosure, a communication device for transmitting a wireless channel in a wireless communication system is provided. The communication device includes: at least one transceiver; at least one processor; and at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. The operations include: determining a first resource, a second resource, and a third resource for wireless communication within a resource pool on a cell; generating a first control information format including timing information regarding the second resource and the third resource; transmitting a first physical control channel carrying the first control information format and an associated first physical shared channel within the first resource; and transmitting a second physical control channel carrying the second control information format and an associated second physical shared channel within the second resource, the second control information format including availability-related information of the third resource; and determining whether to perform a wireless channel transmission on the third resource based on the availability-related information of the third resource.

[0008] In another aspect of the present disclosure, a computer-readable non-transitory storage medium is provided comprising at least one computer program that causes at least one processor to perform operations. The operations include: determining a first resource, a second resource, and a third resource for wireless communication within a resource pool on a cell; generating a first control information format including timing information about the second resource and the third resource; transmitting a first physical control channel and an associated first physical shared channel carrying the first control information format within the first resource; and transmitting a second physical control channel and an associated second physical shared channel carrying a second control information format within the second resource, the second control information format including availability-related information of the third resource; and determining whether to perform wireless channel transmission on the third resource based on the availability-related information of the third resource.

[0009] In another aspect of the present disclosure, a method for a communication device to receive a wireless channel in a wireless communication system is provided. The method comprises: detecting a first physical control channel carrying a first control information format from a first resource within a resource pool on a cell, the first control information format including time information regarding a second resource and a third resource; receiving an associated first physical shared channel within the first resource in which the first physical control channel is detected; receiving a second physical control channel carrying a second control information format and an associated second physical shared channel within the second resource, the second control information format including information regarding availability of the third resource; and determining whether the third resource is valid based on the information regarding availability of the third resource.

[0010] In another aspect of the present disclosure, a communication device for receiving a wireless channel in a wireless communication system is provided. The communication device includes: at least one transceiver; at least one processor; and at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. The operations include: detecting a first physical control channel carrying a first control information format in a first resource within a resource pool on a cell, the first control information format including timing information regarding a second resource and a third resource; receiving an associated first physical shared channel within the first resource in which the first physical control channel is detected; receiving a second physical control channel carrying a second control information format and an associated second physical shared channel within the second resource, the second control information format including availability-related information of the third resource; and determining whether the third resource is available based on the availability-related information of the third resource.

[0011] In another aspect of the present disclosure, a computer-readable non-transitory storage medium is provided comprising at least one computer program that causes at least one processor to perform operations. The operations include: detecting a first physical control channel carrying a first control information format in a first resource within a resource pool on a cell, the first control information format including time information about a second resource and a third resource; receiving an associated first physical shared channel within the first resource in which the first physical control channel was detected; receiving a second physical control channel carrying a second control information format and an associated second physical shared channel within the second resource, the second control information format including availability-related information of the third resource; and determining whether the third resource is available based on the availability-related information of the third resource.

[0012] In each aspect of the present specification, the communication device transmitting the wireless channel or the operations related thereto may include: performing LBT before a slot including the third resource; and determining availability of the third resource based on a result of the LBT.

[0013] In some implementations, the LBT may be performed based on shared spectrum channel access related parameters being set for the cell.

[0014] In each aspect of the present specification, the communication device transmitting the wireless channel or the operations related thereto may further include: transmitting a third physical control channel carrying a third control information format within the third resource and an associated third physical shared channel, based on the availability of the third resource.

[0015] In each aspect of the present specification, the availability-related information of the third resource in the second control information format may include time information of the fourth resource that replaces the third resource.

[0016] In each aspect of this specification, the time information of the fourth resource may include a slot offset from the third resource to the fourth resource.

[0017] In each aspect of the present specification, the communication device transmitting the wireless channel or the operations related thereto may further include transmitting a third physical control channel carrying a third control information format within the fourth resource and an associated third physical shared channel.

[0018] In each aspect of the present specification, the communication device transmitting the wireless channel or the operations related thereto may further include: receiving a setting regarding a maximum number N of reserved resources indicated by control information, wherein N > 2.

[0019] In each aspect of this specification, each of the first, second and third resources is L subCH It can contain dog subchannels.

[0020] In each aspect of the present specification, the communication device receiving the wireless channel or the operations related thereto may include: if the third resource is available, the operations may include attempting to detect a third physical control channel carrying a third control information format in the third resource, and if the third physical control channel is detected, attempting to decode an associated third physical shared channel.

[0021] In each aspect of this specification, the communication device receiving the wireless channel or the operations related thereto may include: not attempting to detect a physical control channel in the third resource if the third resource is invalid. For example, in some implementations, the operations may include: not performing physical control channel monitoring in the lowest subchannel of the third resource if the third resource is invalid.

[0022] In each aspect of the present specification, the communication device receiving the wireless channel or the operations related thereto may further include: receiving a setting regarding a maximum number N of reserved resources indicated by control information, wherein N > 2.

[0023] The above problem solving methods are only some of the examples of this specification, and various examples reflecting the technical features of this specification can be derived and understood by a person having ordinary knowledge in the relevant technical field based on the detailed description below.

[0024] According to some implementations of this specification, wireless communication signals can be transmitted / received efficiently. Accordingly, the overall throughput of a wireless communication system can be increased.

[0025] According to some implementations of this specification, the technology for communicating between devices in licensed spectrum, which is licensed to a particular network operator and has exclusive or preferential use by that network operator, may also be utilized in shared spectrum.

[0026] Some implementations of this specification allow for efficient communication between devices over shared spectrum, which is unlicensed spectrum that is not licensed to a specific network operator and can be freely used by multiple network operators.

[0027] The effects according to this specification are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art related to this specification from the detailed description below.

[0028] FIG. 1 is an example of a communication system 1 to which implementations of the present specification can be applied;

[0029] FIG. 2 is a block diagram illustrating examples of communication devices capable of performing a method according to the present specification;

[0030] Figure 3 illustrates an example of a frame structure available in a 3GPP-based wireless communication system;

[0031] Figure 4 illustrates a resource grid of slots;

[0032] FIG. 5 illustrates communication links in a wireless communication system;

[0033] Figure 6 is a diagram illustrating frequency resources and time resources for communication between devices;

[0034] Figures 7 and 8 illustrate the transmission structure of physical channels for communication between devices within a slot;

[0035] Figure 9 illustrates a resource block (RB) interlace;

[0036] Figure 10 illustrates interlaced RB-based uplink resource allocation in a shared spectrum;

[0037] FIG. 11 and FIG. 12 are diagrams illustrating a channel access mechanism on a shared spectrum according to some implementations;

[0038] FIGS. 13 and 14 are diagrams illustrating resource allocation for communication between devices according to some implementations;

[0039] FIG. 15 illustrates an example of resource reservation for communication between devices on a shared spectrum according to some implementations of this specification;

[0040] FIG. 16 illustrates another example of resource reservation for device-to-device communication over a shared spectrum according to some implementations of this specification;

[0041] FIG. 17 illustrates another example of resource reservation for device-to-device communication over a shared spectrum according to some implementations of this specification;

[0042] FIG. 18 illustrates further examples of resource reservation for device-to-device communication over a shared spectrum according to some implementations of the present specification;

[0043] FIG. 19 is an example of a process in which a communication device performs wireless channel transmission according to some implementations of the present specification;

[0044] FIG. 20 is an example of a process in which a communication device performs wireless channel reception according to some implementations of the present specification.

[0045] Hereinafter, implementations according to this specification will be described in detail with reference to the attached drawings. The detailed description provided below, together with the attached drawings, is intended to describe exemplary implementations of this specification and is not intended to represent the only possible implementations of this specification. The detailed description below includes specific details to provide a thorough understanding of this specification. However, one of ordinary skill in the art will appreciate that this specification may be practiced without these specific details.

[0046] In some cases, to avoid ambiguity in the concepts of this specification, known structures and devices may be omitted or illustrated in block diagram form focusing on the core functions of each structure and device. Furthermore, identical components are described using the same drawing reference numerals throughout this specification.

[0047] The techniques, devices, and systems described below can be applied to various wireless multiple access systems.

[0048] For convenience of explanation, the following description is based on a 3rd Generation Partnership Project (3GPP)-based communication system. However, the technical features of this specification are not limited thereto. For example, although the detailed description below is based on 3GPP (3rd Generation Partnership Project) LTE or 5G technology, some implementations of this specification are applicable to any other mobile communication system and systems to be introduced in the future (e.g., 6G), except for those specific to 3GPP LTE / 5G.

[0049] For terms and technologies used in this specification that are not specifically explained, refer to 3GPP-based standard documents, for example, 3GPP TS 23.304, 3GPP TS 23.285, 3GPP TS 23.287, 3GPP TS 24.587, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.300, 3GPP TS 36.321, 3GPP 36.322, 3GPP TS 36.323, 3GPP TS and 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.321, 3GPP TS 38.322, 3GPP TS 38.323, and 3GPP TS 38.331.

[0050] In the examples of this specification described below, the expression "assumes" that a device "assumes" that the entity transmitting the channel transmits the channel in a manner consistent with the "assume." The entity receiving the channel may mean that, under the assumption that the channel was transmitted in a manner consistent with the "assume," the entity receiving the channel receives or decodes the channel in a manner consistent with the "assume."

[0051] In this specification, UE may be fixed or mobile, and includes various devices that communicate with a BS (base station, BS) to transmit and / or receive user data and / or various control information. UE may be referred to as (Terminal Equipment), MS (Mobile Station), MT (Mobile Terminal), UT (User Terminal), etc. In addition, in this specification, BS generally refers to a fixed station that communicates with UE and / or other BSs, and exchanges various data and control information by communicating with UE and other BSs. BS may be referred to by other terms such as ABS (Advanced Base Station), NB (Node-B), eNB (evolved-NodeB), gNB, BTS (Base Transceiver System), Access Point, PS (Processing Server), etc. For convenience of explanation, base stations are collectively referred to as BSs regardless of the type or version of communication technology.

[0052] In this specification, a node refers to a fixed point capable of transmitting and receiving wireless signals by communicating with a UE. Various types of BSs can be used as nodes, regardless of their designation. Each node is equipped with at least one antenna. The antenna may refer to a physical antenna, an antenna port, a virtual antenna, or an antenna group. A node is also referred to as a point.

[0053] Meanwhile, 3GPP-based communication systems use the concept of cells to manage wireless resources. Cells associated with wireless resources are distinct from cells within a geographic area. A "cell" within a geographic area can be understood as the coverage within which a node can provide services using a carrier, while a "cell" within a wireless resource is associated with a bandwidth (BW), which is the frequency range configured by the carrier. Downlink coverage, the range within which a node can transmit valid signals, and uplink coverage, the range within which a node can receive valid signals from a UE, depend on the carrier carrying the signals. Therefore, the coverage of a node is often associated with the coverage of the "cell" within which the wireless resources are used. Therefore, the term "cell" can sometimes refer to the coverage of a service provided by a node, sometimes to a wireless resource, and sometimes to the range within which a signal using the wireless resource can reach with effective intensity.

[0054] A "cell" associated with wireless resources can be defined as a combination of downlink resources (DL resources) and uplink resources (UL resources), i.e., a combination of a DL component carrier (CC) and an UL CC. A cell can be configured with only DL resources or a combination of DL resources and UL resources. When carrier aggregation is supported, the linkage between the carrier frequency of the DL resources (or DL ​​CC) and the carrier frequency of the UL resources (or UL CC) can be indicated by system information. Here, the carrier frequency can be the same as or different from the center frequency of each cell or CC.

[0055] In a wireless communication system, a UE receives information from a base station (BS) via the downlink (DL), and the UE transmits information to the base station via the uplink (UL). The information transmitted and / or received by the BS and UE includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and / or receive.

[0056] 3GPP-based communication standards define downlink physical channels corresponding to resource elements that carry information originating from higher layers, and downlink physical signals corresponding to resource elements that are used by the physical layer but do not carry information originating from higher layers. For example, the physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), and physical downlink control channel (PDCCH) are defined as downlink physical channels, and reference signals and synchronization signals are defined as downlink physical signals. A reference signal (RS), also referred to as a pilot, refers to a signal with a predefined special waveform that is known to the BS and UE. For example, the demodulation reference signal (DMRS) and the channel state information RS (CSI-RS) are defined as downlink reference signals. 3GPP-based communication standards define uplink physical channels corresponding to resource elements that carry information originating from higher layers, and uplink physical signals corresponding to resource elements that are used by the physical layer but do not carry information originating from higher layers.For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are defined as uplink physical channels, and a demodulation reference signal (DMRS) for uplink control / data signals and a sounding reference signal (SRS) used for uplink channel measurement are defined.

[0057] In this specification, PDCCH refers to a set of time-frequency resources (e.g., resource elements (REs)) that carry downlink control information (DCI), and PDSCH refers to a set of time-frequency resources that carry downlink data. In addition, PUCCH, PUSCH, and PRACH refer to sets of time-frequency resources that carry uplink control information (UCI), uplink data, and random access preamble, respectively (respectively). Hereinafter, the expression that a UE / BS transmits / receives a PUCCH / PUSCH / PRACH is used with the same meaning as that a UE / BS transmits / receives UCI / uplink data / random access preamble on or through a PUCCH / PUSCH / PRACH, respectively. Additionally, the expression that BS / UE transmits / receives PBCH / PDCCH / PDSCH is used with the same meaning as transmitting / receiving broadcast information / DCI / downlink data on or through PBCH / PDCCH / PDSCH, respectively.

[0058] In this specification, radio resources (e.g., time-frequency resources) scheduled or configured by the BS to the UE for transmission or reception of PUCCH / PUSCH / PDSCH are also referred to as PUCCH / PUSCH / PDSCH resources.

[0059] Since a communication device receives physical channels and / or physical signals in the form of radio signals on a cell, it cannot selectively receive only radio signals containing only a specific physical channel or a specific physical signal through a radio frequency (RF) receiver, nor can it selectively receive only radio signals excluding only a specific physical channel or a specific physical signal through an RF receiver. In actual operation, the communication device first receives radio signals on a cell through an RF receiver, converts the radio signals, which are RF band signals, into baseband signals, and decodes the physical signals and / or physical channels within the baseband signals using one or more processors. Therefore, in some implementations of the present specification, not receiving a physical signal and / or a physical channel may not actually mean that the communication device does not receive radio signals containing the physical signal and / or physical channel at all, but rather does not attempt to recover the physical signal and / or physical channel from the radio signals, for example, does not attempt to decode the physical signal and / or the physical channel.

[0060] Figure 1 is an example of a communication system 1 to which implementations of the present specification can be applied.

[0061] Referring to FIG. 1, the communication system (1) applicable to this specification includes a wireless device, a BS, and a network. Here, the wireless device may refer to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (e.g., E-UTRA), WiFi, or 6G to be introduced in the future).

[0062] Although not limited thereto, the wireless devices may include a robot (100a), a vehicle (100b-1, 100b-2, 100b-3, 100b-4), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicles may include a ground vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing communication between vehicles, etc. Here, the vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone) and an Urban Air Mobility (UAM) (e.g., an unmanned aerial vehicle). The XR devices may include an AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) device. Mobile devices may include smartphones, smart pads, wearable devices (e.g., smartwatches, smart glasses), and computers (e.g., laptops). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors, smart meters, and the like. For example, BSs and networks can also be implemented using wireless devices, and a specific wireless device may act as a BS / network node for other wireless devices.

[0063] Wireless devices (100a to 100f) can be connected to a network through a BS (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) through a network. The wireless devices (100a to 100f) can communicate with each other through the BS (200) / network, but can also communicate directly (e.g., sidelink communication) without going through the BS / network. For example, the vehicles (100b-1, 100b-2, 100b-3, 100b-4) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Additionally, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0064] Wireless communication / connection can be established between wireless devices (100a~100f) / BS(200) - BS(200) / wireless devices (100a~100f). Here, the wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) for uplink / downlink communication (UL / DL) and sidelink communication (SL) (or D2D communication). Through the wireless communication / connection (UL / DL, SL), the wireless device and the BS / wireless device can transmit / receive wireless signals to / from each other. To this end, at least some of 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.), and resource allocation processes can be performed based on various proposals of this specification.

[0065] FIG. 2 is a block diagram illustrating examples of communication devices capable of performing a method according to the present specification. Referring to FIG. 2, a first wireless device (100) and a second wireless device (200) can transmit and / or receive wireless signals via various wireless access technologies. Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the BS (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 1.

[0066] Each of the first wireless device (100) and the second wireless device (200) includes one or more processors (102, 202) and one or more memories (104, 204), and may further include one or more transceivers (106, 206) and / or one or more antennas (108). The processors (102, 202) control the memories (104, 204) and / or the transceivers (106, 206), and may be configured to implement the functions, procedures, and / or methods described / suggested below. For example, the processors (102, 202) may process information in the memories (104, 204) to generate first information / signals, and then transmit a wireless signal including the first information / signals via the transceivers (106, 206). In addition, the processor (102, 202) may receive a wireless signal including second information / signal through the transceiver (106, 206), and then store information obtained from signal processing of the second information / signal in the memory (104, 204). The memory (104, 204) may be connected to the processor (102, 202) and may store various information related to the operation of the processor (102, 202). For example, the memory (104, 204) may perform some or all of the processes controlled by the processor (102, 202), or store software code including commands for performing the procedures and / or methods described / proposed below. Here, the processor (102, 202) and the memory (104, 204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology. A transceiver (106, 206) may be connected to a processor (102, 202) and may transmit and / or receive wireless signals via one or more antennas (108, 208). The transceiver (106, 206) may include a transmitter and / or a receiver.

[0067] Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). One or more processors (102, 202) may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) in accordance with the functions, procedures, proposals, and / or methods disclosed in this specification. One or more processors (102, 202) may generate messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in this specification. One or more processors (102, 202) may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in this specification, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) may receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in this specification.

[0068] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the functions, procedures, proposals, and / or methods disclosed in this specification may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The functions, procedures, proposals, and / or methods disclosed in this specification may be implemented using firmware or software in the form of codes, instructions, and / or sets of instructions.

[0069] One or more memories (104, 204) may be connected to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories (104, 204) may be located internally and / or externally to one or more processors (102, 202). Additionally, one or more memories (104, 204) may be connected to one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0070] One or more transceivers (106, 206) may transmit / receive user data, control information, wireless signals / channels, etc., referred to in the methods and / or flowcharts of this specification, to / from one or more other devices. Furthermore, one or more processors (102, 202) may control one or more transceivers (106, 206) to transmit / receive user data, control information, or wireless signals to / from one or more other devices. Furthermore, one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and / or receive user data, control information, wireless signals / channels, etc., referred to in the functions, procedures, proposals, methods, and / or flowcharts of this specification, via one or more antennas (108, 208). In this specification, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) may convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202). One or more transceivers (106, 206) may convert processed user data, control information, wireless signals / channels, etc. from baseband signals to RF band signals using one or more processors (102, 202). For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or a filter.

[0071] In this specification, at least one memory (104, 204) can store instructions or programs, which, when executed, cause at least one processor (102, 202) operably connected to the at least one memory to perform operations according to some embodiments or implementations of the present specification.

[0072] In this specification, a computer-readable (non-transitory) storage medium can store at least one instruction or computer program, which when executed by at least one processor causes the at least one processor to perform operations according to some embodiments or implementations of the present specification.

[0073] Figure 3 illustrates an example of a frame structure available in a 3GPP-based wireless communication system.

[0074] The structure of the frame in FIG. 3 is merely an example, and the number of subframes, slots, and symbols in the frame may vary. In some wireless communication systems, OFDM numerologies (e.g., subcarrier spacing (SCS)) may be set differently between multiple cells aggregated to a single UE. Accordingly, the (absolute time) duration of a time resource (e.g., subframe, slot, or transmission time interval (TTI)) composed of the same number of symbols may be set differently between the aggregated cells. Here, the symbol may include an OFDM symbol (or a cyclic prefix - orthogonal frequency division multiplexing (CP-OFDM) symbol), an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol). In this specification, the terms symbol, OFDM-based symbol, OFDM symbol, CP-OFDM symbol and DFT-s-OFDM symbol may be interchangeable.

[0075] Referring to Figure 3, uplink and downlink transmissions are organized into frames. Each frame is T f = (△f max *N f / 100)*T c = 10 ms duration, where T is the basic time unit. c = 1 / (△f max *N f ) and △f max = 480*10 3 Hz, and N f =4096. For reference, the sampling time T s = 1 / (△f ref *Nf,ref ) and △f ref = 15*10 3 Hz, and N f,ref =2048. T c Wow T s is a constant κ = T s / T c = 64 relationship. A frame consists of 10 subframes, and the duration of a single subframe is T. sf is 1ms. Subframes are further divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot is divided into N slots based on a cyclic prefix (CP). slot symb It can be composed of symbols. For example, in some scenarios, in the case of normal CP, each slot consists of 14 OFDM symbols, and in the case of extended CP, each slot consists of 12 OFDM symbols. The numerology is exponentially scalable with subcarrier spacing △f = 2. u *Depends on 15 kHz. The following table shows the subcarrier spacing for regular CP △f = 2. u *Number of OFDM symbols per slot at 15 kHz (N) slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown.

[0076]

[0077] The following table shows the subcarrier spacing for extended CP △f = 2. u *Indicates the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe at 15 kHz.

[0078]

[0079] For a subcarrier spacing setting u, slots are n in increasing order within a subframe. u s ∈ {0, ..., nsubframe,u slot - 1} and n in increasing order within the frame u s,f ∈ {0, ..., n frame,u slot - Numbered as 1}.

[0080] Hereinafter, implementations of this specification are described by referring to the minimum unit of time for scheduling uplink, downlink, and sidelink transmissions as a slot. However, depending on the wireless communication system, the minimum unit of time for scheduling may be referred to by a different term. For example, in an LTE-based system, the minimum unit of time for scheduling transmissions is referred to as a subframe or a transmission time interval (TTI), whereas in an NR-based system, the minimum unit of time for scheduling is referred to as a slot.

[0081] Figure 4 illustrates a resource grid of slots. A slot is a multiple (e.g., N) in the time domain. slot symb ) contains symbols of each numeral (e.g., subcarrier spacing) and carrier, a common resource block (CRB)N indicated by higher layer signaling (e.g., radio resource control (RRC) signaling). start,u grid Starting from,N size,u grid,x *N RB sc Dog subcarriers and N subframe,u symb A resource grid of OFDM symbols is defined, where N size,u grid,xis the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for downlink and UL for uplink. N RB sc is the number of subcarriers per RB, and in 3GPP-based wireless communication systems, N RB sc is typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u size,u grid is given to the UE by higher layer parameters (e.g., RRC parameters) from the network. Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex-valued symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l indicating the symbol position relative to a reference point in the time domain. RBs can be classified into common resource blocks (CRBs) and physical resource blocks (PRBs). CRBs are numbered upwards from 0 in the frequency domain for subcarrier spacing configuration u. The center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with 'point A', which is a common reference point for resource block grids. PRBs for subcarrier spacing configuration u are defined in a bandwidth part (BWP), numbered from 0 to N. size,u BWP,i -1, where i is the number of the bandwidth part. Common resource block n u CRB and bandwidth part i within physical resource block n PRB The relationship between the two is as follows: nu PRB = n u CRB +N start,u BWP,i , here N start,u BWP,i is a common resource block (BRB) whose bandwidth part starts relative to CRB 0. A BWP comprises multiple contiguous RBs in the frequency domain. For example, a BWP may be a given numeral u within a BWP i on a given carrier. i A subset of contiguous CRBs defined for a carrier. A carrier may contain up to N (e.g., 5) BWPs. A UE may be configured to have one or more BWPs on a given component carrier. Data communication is performed through the activated BWPs, and only a predetermined number (e.g., 1) of BWPs configured for the UE may be activated on the carrier.

[0082] For each BWP, the UE may be provided with at least one of the following parameters for the serving cell: i) subcarrier spacing, ii) cyclic prefix, iii) N start BWP = Offset RB with the assumption of 275 set and length L RB CRBN provided by the RRC parameter locationAndBandwidth, which indicates the resource indicator value (RIV). start BWP =O carrier +RB start and the number of contiguous RBsN size BWP =L RB , and the subcarrier spacing is provided by the RRC parameter offsetToCarrierO carrier; an index within the set of DL BWPs or UL BWPs; a set of BWP-common parameters and a set of BWP-specific parameters.

[0083] Virtual resource blocks (VRBs) are defined within the bandwidth part and are numbered from 0 to N. size,u BWP,i -1, where i is the number of the bandwidth part. The UE may assume that VRBs are mapped to PRBs according to the mapping method indicated to the UE (e.g., non-interleaved or interleaved mapping). If no mapping method is indicated, the UE assumes non-interleaved mapping. In the case of non-interleaved VRB-to-PRB mapping, VRB n may be mapped to PRB n. In the case of interleaved VRB-to-PRB mapping, VRBs may be distributed and mapped to PRBs according to a predefined rule.

[0084] Figure 5 illustrates communication links in a wireless communication system.

[0085] Referring to FIG. 5, in a wireless communication system, a UE receives information from a BS via a downlink (DL), and the UE transmits information to the BS via an uplink (UL). To address the burden on the BS due to rapidly increasing data traffic, a technology (e.g., sidelink (SL) communication) that supports direct communication between two or more nearby UEs without going through a network node using wireless communication technology has been studied. UEs within or outside the coverage area of ​​a BS can send data to another UE without going through the network via a sidelink that supports UE-to-UE direct communication using sidelink resource allocation modes, physical layer signals / channels, and physical layer processes.

[0086] Transmissions in SL use OFDM waveforms with CP. The frame structure described in Fig. 3 and the resource grid structure described in Fig. 4 can be applied to SL. In some scenarios, for example, in NR V2X, only certain slots can be (pre-)configured to accommodate SL transmissions, and the available sidelink resources can consist of (common) RBs in the sidelink (time resources) and SL BWP (frequency resources). A subset of the available SL resources can be (pre-)configured to be used by several UEs for SL transmissions. This subset of the available SL resources is called a resource pool.

[0087] Figure 6 is a diagram illustrating frequency resources and time resources for sidelink.

[0088] Referring to Fig. 6, a resource pool is composed of (pre-configured) i) contiguous PRBs and ii) contiguous or non-contiguous slots for SL transmissions. The concept of BWP can also be applied to the sidelink. A UE can be configured with a BWP having a numerology and a resource grid for SL transmissions. Hereinafter, a BWP configured for SL transmissions is referred to as an SL BWP. The SL BWP can occupy a contiguous portion of the bandwidth within a carrier. SL transmissions and receptions can occur within the SL BWP. A resource pool can be defined within the SL BWP, and a single numerology is used within the resource pool. A resource pool can be shared by several UEs for SL transmissions, and can be used for all transmission types (e.g., unicast, groupcast, and broadcast). A UE may be configured with one or more sidelink resource pools via higher-layer signaling (e.g., RRC signaling). The UE may transmit on the sidelink using its own transmission resource pool(s), while also receiving data on resource pools used for sidelink transmissions by other UE(s).

[0089] In the frequency domain, the resource pool is divided into a predefined number L of consecutive subchannels, each of which consists of a group of consecutive RBs within a slot. The number of RBs in a subchannel is N. sch corresponds to the subchannel size and is (pre-)set for the resource pool. L and N schcan be provided to the UE via higher layer signaling (e.g., RRC signaling). The first RB of the first subchannel within the SL BWP is (pre-)configured via RRC signaling. For example, the lowest RB index of the subchannel with the lowest index within the resource pool based on the lowest RB index of the SL BWP can be provided to the UE(s). Subchannel size N in NR V2X sch can be equal to 10, 12, 15, 20, 25, 50, 70, or 100 RBs. In sidelink, a subchannel represents the smallest unit for sidelink data transmission or reception. Sidelink transmission can be performed using one or more subchannels.

[0090] In the time domain, slots that are part of a resource pool are (pre-)configured and occur at regular intervals (e.g., 10240 ms). In each slot of the resource pool, N slot symb Among the dog symbols, only a subset of the consecutive symbols are (pre-)configured for sidelinking. The subset of sidelink symbols per slot is indicated by the starting symbol and the number of consecutive symbols, and these are (pre-)configured per resource pool.

[0091] 3GPP-based communication standards define sidelink physical channels corresponding to resource elements that carry information originating from higher layers, and sidelink physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, the physical sidelink shared channel (PSSCH), the physical sidelink control channel (PSCCH), the physical sidelink broadcast channel (PSBCH), and the physical sidelink feedback channel (PSFCH) can be used as sidelink physical channels. In this specification, the PSCCH carries sidelink control information (SCI) in the sidelink. For example, the SCI is used to indicate resources and other transmission parameters used by the UE for the PSSCH, and the PSCCH transmission is associated with a demodulation reference signal (DM-RS). The PSSCH can carry the data payload in the sidelink and additional control information. Data can be organized into TB(s), and each TB can be associated with an SCI. For example, the PSSCH is used to carry control information for transport block (TB)(s), hybrid automatic repeat request (HARQ) processes, and CSI feedback triggers. In some scenarios, at least six OFDM symbols are used for PSSCH transmission within a slot, and the PSSCH is associated with a DM-RS.The PSBCH carries information to support synchronization in the sidelink, and in some scenarios, the PSBCH may be sent within a sidelink synchronization signal block (S-SSB). The PSFCH carries HARQ feedback on the sidelink from the UE intended to be the recipient of the PSSCH to the UE that performed the PSSCH transmission. Hereinafter, the UE performing the sidelink transmission is referred to as the TX UE, and the intended recipient(s) of the sidelink transmission is referred to as the RX UE(s).

[0092] In some scenarios, SCI is transmitted in two stages. For example, in NR V2X, 1 st -Stage SCI is carried on PSCCH and 2 nd -Step SCI can be carried on the corresponding PSSCH. SCI 1 st -Stage SCI and 2 nd - Dividing into step SCI allows other UEs, other than the RX UEs of the sidelink transmission, to use the above 1 for channel sensing purposes, i.e. to determine resources reserved by other transmissions. st -Allows only step SCI to be decoded. Meanwhile, the above 2 nd -Step SCI provides additional control information required for the RX UE(s) of sidelink transmission.

[0093] The number of symbols used for sidelink transmission within a slot may vary depending on the physical channels carried within the slot.

[0094] Figures 7 and 8 illustrate the transmission structure of sidelink physical channels within a slot.

[0095] A PSCCH can be multiplexed with an associated PSSCH on non-overlapping resources within the same slot. Referring to FIG. 7, a PSCCH is transmitted starting from the lowest RB in the subchannel(s) occupied by the associated PSSCH in the frequency domain, and starting from the second symbol in the slot in the time domain. The number of symbols for the PSCCH is (pre-)configured per resource pool and can be, for example, 2 or 3 symbols. According to some scenarios (e.g., NR V2X), in the frequency domain, the PSCCH is N PSCCH Occupying the RBs of N PSCCH can be (pre-)configured to UE(s) per resource pool via higher layer signaling (e.g. RRC signaling). In some scenarios (e.g. NR V2X), N PSCCH can be set to equal 10, 12, 15, 20, or 25 RBs per resource pool. In some scenarios (e.g., NR V2X), N PSCCH is contained within one subchannel, and the number of RBs for PSCCH is N. PSCCH N is the number of RBs in the subchannel sch can be constrained by (i.e., N PSCCH ≤N sch ). PSCCH is PSSCH and 2 nd -1 containing control information associated with the step SCI st - Carries the SCI step. For this, for example, SCI format 1-A can be used. 1 above st - The step SCI may indicate the frequency resources (e.g., subchannel(s)) of the PSSCH carrying the current (re-)transmission of the transport block (TB), and may indicate resource reservation for retransmission(s) of the TB up to a predefined number of times (e.g., 2). 1 st- The step SCI may include the priority of the associated PSSCH, 2 nd - May include information about the format and size of the step SCI. 1 above st - The step SCI may include information about the modulation and coding scheme (MCS) of the transport block (TB) carried on the associated PSSCH. Although not illustrated in FIG. 7, a DM-RS associated with the PSCCH (hereinafter, PSCCH DM-RS) may be transmitted within the PSCCH for demodulation of the PSCCH. For example, each PSCCH symbol (i.e., an OFDM symbol including the PSCCH) may include a PSCCH DM-RS. Although not illustrated in FIG. 7, the DM-RS associated with the PSSCH is carried on different symbols within the slot to which the PSSCH is allocated (hereinafter, PSSCH slot). Multiple time patterns may be (pre-)configured for the PSSCH DM-RS within the resource pool, and the above 1 st - The step SCI may include information about which time pattern is used for the associated PSSCH.

[0096] PSSCH is 2 nd - carries a data payload consisting of step SCI and TB(s). 2 above nd - The step SCI can carry information used to decode the PSSCH and information to support HARQ feedback and CSI reporting. 2 above. nd - The step SCI may include a layer 1 source ID representing the identifier (within the physical layer) of the TX UE and a layer 1 destination ID representing the identifier(s) of the intended recipient(s) (RX UE(s)) of the corresponding TB. 2 nd- The step SCI may carry a 1-bit new data indicator (NDI) used to specify whether the TB sent on the PSSCH corresponds to a transmission of new data or a retransmission. 1 in the PSCCH st -After decoding the step SCI, the RX UE nd - You will have the information needed to decode the step SCI. 2 nd -Step SCI can be decoded using PSSCH DM-RS. 2 before being mapped to PSSCH nd -Step SCI and TB are each channel coded and multiplexed according to a predefined process. Depending on the number of layers supported in PSSCH (i.e., the number of data streams), the multiplexed 2 nd -Stage SCI and TB, PSSCH's L PSSCH Before being mapped to subchannel(s), it is mapped and precoded to one or two layers. The PSSCH starts from the lowest RB within the subchannel carrying the PSCCH, starting from N PSSCH =L PSSCH *N sch Occupying the dog RBs, here N PSSCH is the number of RBs occupied by the PSSCH, and L PSSCH is the number of subchannels for PSSCH, and N sch is the number of RBs per subchannel.

[0097] Referring to Figure 7, the PSSCH may be transmitted from the second symbol to the second to the last symbol in the slot, or from the second symbol to the symbol immediately preceding the last symbol in the slot. In some scenarios, 7 to 14 symbols may be (pre-)configured in the slot for sidelink, and the PSCCH may be sent in 5 to 12 consecutive symbols. The number of symbols occupied by the PSSCH depends on the number of SL symbols allocated in the slot and whether the PSFCH is sent in that slot. Within the symbols carrying the PSCCH, the PSSCH may be transmitted (the PSCCH may be transmitted in the entire L PSSCH (If the subchannel(s) are not occupied) may be multiplexed in the frequency domain with the PSCCH. The second symbol in the slot (i.e., the first symbol with the PSCCH or with the PSCCH / PSSCH) may be duplicated in the first symbol of the slot for use in automatic gain control (AGC) purposes. Additionally, the symbol after the last symbol with the PSSCH may be used as a guard symbol.

[0098] FIG. 7 illustrates a sidelink transmission structure in which the PSCCH occupies three symbols in the time domain and 14 symbols within a slot of 14 symbols are used for PSCCH / PSSCH transmission; however, the PSCCH may occupy two symbols, or some leading symbols within a slot may be used for PSCCH / PSSCH transmission and the remaining symbols may be used for PSFCH or for additional guard symbols.

[0099] Referring to Fig. 8, according to some scenarios (e.g., NR V2X), for a resource pool with L subchannels, there are L possible PSCCH locations within a slot, starting from the second SL symbol within the slot and from the lowest RB within each subchannel. In other words, for a resource pool with L subchannels, there may be L PSCCH candidate resources in each slot. Therefore, in some scenarios, 1 st - To receive a step SCI, the UE needs to check (or monitor) L possible PSCCH locations in each slot within the resource pool.

[0100] Referring to FIGS. 7 and 8, in some scenarios (e.g., NR V2X), the UE may, through higher layer signaling (e.g., RRC signaling), specify the number of symbols for PSCCH for the resource pool, N. sym,PSCCH and the number of RBs for PSCCHN PSCCH , and the PSCCH starts from the second symbol available for SL transmissions within the slot. sym,PSCCH Starting from the lowest RB of the lowest subchannel of the associated PSSCH within the dog symbols, N PSCCH It is transmitted on the dog RBs.

[0101] A UE may be configured with one or more sidelink resource pools via higher-layer signaling (e.g., RRC signaling). The sidelink resource pools may be used for transmitting or receiving PSSCHs. In some scenarios, the PSSCH is transmitted in the same slot as the associated PSCCH. In some scenarios, the minimum resource allocation unit for the PSSCH in the time domain is a slot. PSSCHs transmitted in consecutive symbols within a slot are not transmitted in symbols not configured for sidelink. The index of the first symbol among consecutive symbols that can be used for sidelink and the number of consecutive symbols that can be used for sidelink may be provided to the UE(s) via higher-layer signaling (e.g., RRC signaling). The UE does not transmit the PSSCH in the last symbol configured for sidelink, which may be used as a guard symbol. In some scenarios, the minimum resource allocation unit for the PSSCH in the frequency domain is a subchannel.

[0102] Referring to FIG. 8, when a PSCCH is transmitted / received in a PSCCH resource candidate of a slot within a resource pool, the PSSCH associated with the PSCCH is transmitted / received within consecutive symbols within the slot in the time domain, and in the frequency domain, the subchannel on which the PSCCH is transmitted / received is L having the lowest subchannel. PSSCHThe PSSCH is transmitted / received on the subchannels. When the PSSCH occupies multiple subchannels, the PSCCH resource candidate(s) of the remaining subchannel(s) other than the lowest subchannel among the multiple subchannels are used for transmission of the PSSCH. The PSCCH resource candidate(s) of the subchannel(s) that are not used for PSSCH transmission in the slot within the resource pool are not used for PSCCH transmission either. The RX UE attempts to detect the PSCCH from the PSCCH resource candidates, and when it detects the PSCCH in the slot, it considers the lowest RB in which the PSCCH is detected based on the SCI carried by the PSCCH as the lowest RB of the PSSCH, and starting from the lowest RB, N PSSCH =L PSSCH *N sch The PSSCH can be received on the dog RBs.

[0103] As the need for vehicle-to-everything (V2X), a communication technology that supports wired / wireless communication between vehicles and other vehicles, infrastructure, networks, or pedestrians, is emerging, a rapid increase in SL communication is expected. To support SL communication stably, it may be considered to support SL communication not only in licensed spectrum, which is licensed to a specific network operator and can be used exclusively or preferentially by that network operator, but also in shared spectrum, which is an unlicensed spectrum that is not licensed to a specific network operator and can be used freely by multiple network operators. However, to support SL communication in shared spectrum, a method for coexisting communication in shared spectrum and SL communication is required. Below, among 3GPP-based communication technologies, technologies applied to uplink and / or downlink communication between UE and BS in shared spectrum are described.

[0104] Unless otherwise stated, the following definitions apply to terms relating to shared spectrum in this specification:

[0105] - Channel: Consists of consecutive RBs on which a channel access process is performed in a shared spectrum, and may refer to a carrier or a portion of a carrier.

[0106] - Channel access procedure (CAP): This refers to the process of evaluating channel availability based on sensing to determine whether other communication devices(s) are using the channel before signal transmission. The BS or UE senses the channel during a sensing slot period, and if the detected power is less than an energy detection threshold for at least a certain period of time within the sensing slot period, the sensing slot period is considered idle or free, otherwise the sensing slot period is considered busy. CAP may be referred to as Listen-Before-Talk (LBT).

[0107] - Channel occupancy: refers to the corresponding transmission(s) on the channel(s) by the BS / UE after the CAP is performed.

[0108] - Channel Occupancy Time (COT): refers to the total time that the BS / UE and any BS / UE(s) sharing the channel occupancy can perform transmission(s) on the channel after the BS / UE performs CAP. COT can be shared for transmissions between the BS and corresponding UE(s).

[0109] Since shared spectrum is not dedicated to a specific network operator, BSs and UEs can apply Listen-Before-Talk (LBT) before transmitting on cells configured with shared spectrum channel access. With LBT, the transmitter listens / senses the channel to determine whether the channel is free or busy, and transmits only if the channel is deemed free. In other words, for shared spectrum, a communication device must determine whether the channel is occupied by other communication devices before transmitting a signal.

[0110] In a shared spectrum, the size of the time interval and / or frequency occupied region of the signal / channel transmitted by the UE and / or the power spectral density (PSD) may be required to be above a certain level in relation to channel occupancy. For example, a communication device may be required to perform transmission in the shared spectrum with the size of the time interval and / or frequency occupied region of the signal / channel and / or with the PSD above a certain level. Considering these occupied channel bandwidth (OCB) and power spectral density-related regulations for the shared spectrum, a set of (equally spaced) non-contiguous RBs on the frequency may be defined as a resource unit used for physical channel / signal transmission. Hereinafter, such a set of non-contiguous RBs is referred to as an interlaced RB, an RB interlace, or an interlace.

[0111] Figure 9 illustrates a resource block (RB) interlace. Referring to Figure 9, multiple interlaces of RBs can be 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 represents the number of interlaced RBs. That is, each interlace can be composed of multiple non-contiguous RBs. In some implementations, M can be given as follows.

[0112]

[0113] Interlaced RB n within BWP i and interlace m u IRB,m ∈{0, 1, ...} and CRB n uCRB can be given by: n u CRB = M*n u IRB,m +N start,u BWP,i + ((m -N start,u BWP,i ) mod M).

[0114] A communication device (e.g., UE) may transmit a signal / channel using one or more interlaced RBs.

[0115] For example, in a 3GPP-based system, resource block assignment information in DCI carried by the PDCCH provides the UE with a set of up to M interlace indices, and (for DCI format 0_0 monitored in the UE-specific search space and for DCI format 0_1) BWP RB-set,UL A set of up to N consecutive RB sets BWP RB-set,UL contiguous RB sets). Here, an RB set consists of multiple contiguous RBs. DCI format 0_0 and DCI format 0_1 ​​are DCI formats used to schedule PUSCH. In some implementations, an RB set may correspond to a frequency resource on which a channel access procedure (CAP) is individually performed in a shared spectrum. For operation with shared spectrum channel access, uplink transmission subcarriers are mapped to one or more RB interlaces.

[0116] In some scenarios, the UE may determine RB(s) corresponding to the intersection of i) the indicated interlace and ii) the union of the indicated RB set(s) and, if any, the guard bands between the indicated RB set(s) as the frequency resource for PUSCH transmission.

[0117] Figure 10 illustrates interlaced RB-based uplink resource allocation in a shared spectrum. Figure 10(a) illustrates a case where a single RB set is indicated through resource allocation information for PUSCH, and Figure 10(b) illustrates a case where contiguous RB sets are indicated through resource allocation information for PUSCH.

[0118] Referring to Fig. 10(a), based on the resource allocation (RA) information for PUSCH indicating {interlace #2, RB set #1}, RBs belonging to interlace #2 in RB set #1 may be determined to be PUSCH resources. That is, RBs corresponding to the intersection of {interlace #2, RB set #1} may be determined to be PUSCH resources. Referring to Fig. 10(b), based on the resource allocation information for PUSCH indicating {interlace #2, RB set #1 / #2}, RBs belonging to interlace #2 in RB sets #1 and #2 may be determined to be PUSCH resources. At this time, the guard band (i.e., GB #1) between RB set #1 and RB set #2 may also be used as a PUSCH transmission resource. That is, in some implementations, RBs corresponding to the intersection of {interlace #2, RB set #1 + RB set #2 + GB #1} may be determined as PUSCH resources. In this case, the guard band (i.e., GB #0) that is not between RB set #1 and RB set #2 even if it is adjacent to RB sets #1 and #2 is not used as a PUSCH transmission resource.

[0119] Figures 11 and 12 illustrate channel access mechanisms on shared spectrum according to some implementations.

[0120] In 3GPP-based systems, channel access in both downlink and uplink relies on LBT. The UE and BS must first sense the communication channel to detect the absence of communication before transmission. If the communication channel is an unlicensed band with a wide bandwidth, the channel sensing process relies on detecting energy levels on multiple subbands of the communication channel, as illustrated in Figure 11. LBT parameters, such as channel assessment parameters, can be configured for the UE by the BS.

[0121] 3GPP-based systems, e.g., NR, can support dynamic time division duplex (TDD), where uplink-downlink allocation can change over time depending on traffic conditions. Referring to FIG. 12, to enable dynamic TDD on a shared spectrum, a UE / BS determines when and where to transmit and / or receive based on indications of a channel occupancy time (COT) structure. A COT includes multiple slots, each of which can include downlink resources, uplink resources, or flexible resources. The COT structure reduces power consumption and channel access delay. In some scenarios (e.g., NR), a typical COT is about 8 ms, and the COT duration can be indicated by DCI format 2_0. A higher layer parameter, co-DurationsPerCellToAddModList, can be set by the BS. The following is an example of a portion of an information element (IE) SlotFormatIndicator containing co-DurationsPerCellToAddModList. In some scenarios, IESlotFormatIndicator is used to configure monitoring of the group-common-PDCCH for slot format indicators (SFIs).

[0122]

[0123] In the above table, sfi-RNTI is a parameter used to set the RNTI used for SFI on a given cell, dci-PayloadSize is a parameter used to set the total length of the DCI payload scrambled with SFI-RNTI, slotFormatCombToAddModList is a list of SlotFormatCombinations for the serving cells of the UE, where each SlotFormatCombination is a parameter used to set the slot formats that occur in consecutive slots in time domain order as listed in the corresponding SlotFormatCombination, and slotFormatCombToReleaseList is a list of SlotFormatCombinations to be released. co-DurationsPerCellToAddModList is a list of CO-DurationsPerCell object(s), each CO-DurationsPerCell object has the parameter servingCellId indicating the ID of the cell to which the configuration is applicable, and the parameter channel occupancy duration for the serving cells of the UE. It includes a parameter positionInDCI indicating the position of the bit field being indicated within the DCI, a parameter subcarrierSpacing indicating the subcarrier spacing as a reference to the list of channel occupancy durations, and a co-DurationList indicating the list of channel occupancy durations in symbol units.

[0124] When the upper layer parameter co-DurationsPerCellToAddModList is set, the following information can be transmitted via DCI format 2_0 with a cyclic redundancy check (CRC) scrambled by the SFI-RNTI: COT Duration Indicator 1, COT Duration Indicator 2, ..., COT Duration Indicator N2. For example, if the position of the COT duration indicator 1 among the bit fields in the DCI format 2_0 is set by the parameters servingCellId and positionInDCI in the CoDurationsPerCell object as a bit field for a serving cell with a serving cell index of 1, and the reference subcarrier spacing for the serving cell is set by the subcarrierSpacing as 15 kHz, and the bit field COT duration indicator 1 in the DCI format 2_0 transmitted by the BS to the UEs includes a bit value indicating 280, the UE(s) detecting the DCI format 2_0 can assume that a COT of 280 OFDM symbols based on the 15 kHz subcarrier spacing for the serving cell is initiated by the BS.

[0125] In some implementations, resource allocation for operations with shared spectrum channel access may be done via a two-level resource indication, e.g., X+Y, where the X-bit may be used to indicate a set of allocated interlace indices. For example, for contiguous allocation, the X-bit may be used to represent a resource indication value (RIV) indicating a starting interlace index m0 and a length l, while for non-contiguous allocation, the X-bit may be used to represent a bitmap consisting of bits each bit corresponding to an interlace. For example, the Y-bit may indicate a set of contiguously allocated RB set(s). For example, the Y-bit may be used to indicate a starting RB set index N. start RB-set and length L RB-set can be used to represent the RIV representing the value of Y. The value of Y is Floor{log2(N start RB-set *(N start RB-set +1) / 2)}, where N start RB-set is the number of RB sets included in the active BWP.

[0126] FIG. 13 and FIG. 14 illustrate resource allocation for wireless communication according to some implementations.

[0127] Two SL resource allocation modes are considered for selection of sub-channels in inter-device communications: Mode 1, where SL resource allocation is provided by the network, and Mode 2, where the UE determines SL transmission resources within a resource pool(s). Figures 13 and 14 illustrate, in particular, resource reservation for retransmissions of the same transport block (TB) and for transmissions and retransmissions of the next TB in Mode 2.

[0128] In some implementations, SL resource allocation mode 2 allows the UE to autonomously select its SL resources (e.g., one or more subchannels) from a resource pool, in which case the UE may operate without network coverage, and the resource pool may be (pre-)configured by the BS when within network coverage. In some implementations, SL resource allocation mode 2 may operate in a dynamic or a semi-persistent manner. The SL resource allocation mode 2 uses almost the same process to select resources for the dynamic and semi-persistent manners, but the dynamic manner may select new resources for each TB and reserve resources only for retransmissions of that TB, whereas the semi-persistent manner selects resources for consecutive SL_Resource_Reselection_Counter TBs.

[0129] In the following description, UE is 1 st- Selected resources reserved for future transmissions by notifying neighboring UEs using the -step SCI are specifically called reserved resources. The UE can select and reserve resources for the transmission (and their retransmissions) of several TBs. The UE can select new SL resources when creating a new TB. To select new SL resources, the UE first defines a selection window to search for candidate resources for transmitting the TB. Referring to FIG. 13, the selection window includes all resources within the range of slots [n+T1, n+T2], where n is a resource (re-)selection trigger or slot from which new resources are to be selected, and T1 is a processing time (in slots) required by the UE to identify candidate resources and select new SL resources for transmission, where T1 is, for example, 3, 5, 9, or 17 slots for subcarrier spacings of 15, 30, 60, or 120 kHz, respectively. proc,1 is smaller than T2, and the value of T 2min <= T2 <= A value determined by the UE within the range of PDB, where PDB is a packet delay budget (in slot units), which is a latency deadline within which the TB must be transmitted and is determined by the application transmitting the packet to be transmitted to the TB. T 2min depends on the priority and subcarrier spacing of TB, for example, T 2min The possible values ​​are {1, 5, 10, 20}*2 u , where u is a subcarrier spacing setting. Once the selection window is determined, the UE identifies candidate resources within the selection window, and the candidate resources are slot-wise in time and L in frequency. PSSCH Dog (i.e. L subCH It is determined by the contiguous subchannels of L PSSCH is the above TB and (1st -Stage SCI and 2 nd - Since the associated SCI (including the step SCI) must be selected to fit within the above candidate resource, L PSSCH depends on the size of the TB, the size of the SCI, and the modulation and coding scheme (MCS).

[0130] If the UE is not transmitting, the UE senses SL resources during a sensing window to identify available candidate resources. The sensing window is a set of slots [n-T0, nT proc,0 ] includes all resources within the range of n, where n is a resource (re-)selection trigger or slot from which new resources should be selected, and T0 is an integer defined as the number of slots depending on the subcarrier spacing setting, for example, corresponding to 1100 ms or 100 ms and determined by the (pre-)configuration of the resource pool. T proc,0 is the time required to complete the sensing process, which can be, for example, 1 slot for a subcarrier spacing of 15 or 30 kHz, or 2 or 4 slots for a subcarrier spacing of 60 or 120 kHz. During the sensing process, the UE receives 1 SL received from other UE(s) within the sensed SL resources. st - Decode the step SCI(s). 1 above st -Step SCI may indicate that another UE has reserved the SL resources for its transport block (TB) and SCI transmission(s) via PSCCH and PSCCH. In particular, the above 1 st -Stage SCI is 1 above st - The UE may indicate SL resources reserved for retransmission of the TB associated with the step SCI, and resources reserved for initial transmission and retransmission of the next TB. The UE may indicate the sensed information (e.g., decoded 1 st-Storing the step SCI and reference signal received power (RSRP) measurements, the sensed information can be used to determine which candidate resources to exclude from the selection window when a new selection is triggered.

[0131] To select new resources, the above SL resource allocation mode 2 defines the following two-step algorithm.

[0132] > Step 1: The UE first excludes candidate resources from the selection window according to certain rules.

[0133] > Step 2: After performing all exclusions in Step 1, the UE selects (N candidate) resource(s) from the remaining available candidate resources (not excluded in Step 1).

[0134] The UE selects N candidate resources within the same selection window for the initial transmission of a TB and its N-1 blind or potential HARQ retransmissions, wherein the selection of the N candidate resources follows the two-step algorithm described above. The UE can perform HARQ retransmissions for groupcast or unicast transmissions if the PSFCH is (pre-)configured within the resource pool, otherwise it can only perform blind retransmissions. When using HARQ retransmissions, if a TB is positively acknowledged, the TX UE drops all subsequent scheduled retransmissions of the TB within the selected resources (including reserved resources). The value of N may vary depending on the UE implementation. If the UE selects a value of N, the UE performs 1-1 selection and reservation of the N candidate resources. st - Consider the limitations of the SCI step. For example, 1 st -Stage SCI is 1 above st- Only resource reservations located within a window W (e.g., of 32 slots) starting from the slot in which the -step SCI is transmitted can be notified, and only for at most N resources, where the maximum value of N can be (pre-)set for the resource pool by the upper layer parameter sl-MaxNumPerReserve to, for example, 2 or 3. Therefore, 1 st -Stage SCI is 1 above st - It can notify about the transmission (or retransmission) of TB occurring in the same slot as the transmission of the -step SCI and about N - 1 reserved resources for the following N - 1 retransmissions of the TB. For example, 1 st - The time resource assignment field in the step SCI (e.g., SCI format 1-A) carries a logical slot offset indication of N = 1 or 2 actual resources if the upper layer parameter sl-MaxNumPerReserve is 2, or N = 1 or 2 or 3 actual resources if sl-MaxNumPerReserve is 3, in the form of a time resource assignment field containing a time resource indicator value (TRIV) determined as follows:

[0135]

[0136] Here, the first resource is within the slot in which SCI format 1-A is transmitted, and t i means the i-th resource time offset based on the first resource, where 1 <= t1<=31 for N=2; and 1 <= t1<=30, 1 <= t2<=31 for N=3. The time resource allocation field in the SCI format 1-A is 5 bits when the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, and is 9 bits when sl-MaxNumPerReserve is set to 3.

[0137] After performing all exclusions in step 1, the UE may first randomly select one of the N resources to select N resources from the available candidate resources. For example, referring to FIG. 14, a UE that selects a first resource in slot m1 randomly selects a second resource such that the 1-th resource time offset t1 relative to the first resource is less than the window W. If N>2, the UE randomly selects a third resource within the range [m1, m1+(W-1)] or the range [m2, m2+(W-1)]. This process is repeated until all resources for TB retransmissions are reserved by the previous SCI. If the UE can select only a subset of the N resources through this process, the remaining resources may be those that were previously reserved by the previous 1 st - Even if the step SCI constraints are not satisfied, it can be randomly selected within the above selection window.

[0138] Start subchannel n of the first resource above start subCH,0 is the subchannel in which the lowest RB of the associated PSCCH is transmitted. The number of consecutively allocated subchannels L for each of the N resources is subCH >=1, and the starting subchannel indices of the resources indicated by the SCI format 1-A transmitted above can be determined from a frequency resource allocation field equal to a frequency resource indicator value (FRIV), excluding the starting subchannel index of the resource in which the SCI format 1-A is transmitted within the slot, as follows.

[0139]

[0140] Here, n start subCH,1 means the starting subchannel for the second resource, and n startsubCH,2 means the starting subchannel for the third resource, N SL subchannel is the number of subchannels in the resource pool provided according to the upper layer parameter sl-NumSubchannel (e.g., see L in Fig. 6). The number of consecutively allocated subchannels L subCH is the number of subchannels to be used for PSSCH / PSCCH transmission in a slot (i.e., the number of subchannels available for PSSCH / PSCCH transmission in a slot), and is indicated equally for N = 1, 2, and 3. The frequency resource allocation field in the SCI format 1-A is set to Ceil{log2(N) when the value of the upper layer parameter sl-MaxNumPerReserve is set to 2. SL subchannel*(N SL subchannel+1) / 2)}-bits, and sl-MaxNumPerReserve is set to 3, then Ceil{log2(N SL subchannel*(N SL subchannel+1)*(2*N SL subchannel+1) / 6)}-bits.

[0141] 1 performed in the second resource above st SCI Format 1-A for retransmission may include an offset for the third resource relative to the second resource.

[0142] The above SCI format 1-A can inform about the resource reservation period (RRP) when reserving resources for PSSCH on a semi-persistent basis. As mentioned above, among the scheduling schemes of SL resource allocation mode 2, the semi-persistent scheme selects resources for consecutive SL_Resource_Reselection_Counter TBs. The time period between resources selected for transmission of consecutive TBs is defined by the resource reservation interval (RRI), and the allowed RRIs are (pre-)configured via the higher layer parameter sl-ResourceReservePeriodList regarding the set of possible RRPs allowed in the resource pool for mode 2. When the UE selects new SL resources, it selects an RRI from the list, and the SL_Resource_Reselection_Counter is randomly set within the interval depending on the selected RRI. For example, a UE transmitting a PSCCH with SCI format 1-A using SL resource allocation mode 2 sets the resource reservation period field of the SCI format 1-A to an index corresponding to a reservation period provided by a higher layer (e.g., MAC) among the indices in sl-ResourceReservePeriodList when the UE is provided with the upper layer (e.g., RRC) parameter sl-MultiReserveResource. The number of bits in the resource reservation period field in SCI format 1-A is Ceil(log2N rsv_period ) is determined by, where, N rsv_period The number of entries in the upper layer parameter sl-ResourceReservePeriodList when sl-MultiReserveResource is set, otherwise it is 0.

[0143] As mentioned above, to support SL communication stably, supporting SL communication on a shared spectrum may be considered. The SL BWP and SL resource pool discussed in the sidelink of 3GPP-based systems, as well as the RB set discussed in the shared spectrum transmission of 3GPP-based systems, may be considered to be reused for SL transmission on the shared spectrum. Hereinafter, the shared spectrum supporting SL transmission is referred to as SL-U. Below, implementations of this specification for coexisting UL / DL transmission and SL transmission on the shared spectrum are described.

[0144] In some implementations of the present specification, one or more SL BWPs may be (pre-)configured within a carrier on a shared spectrum. In some implementations of the present specification, an SL BWP may be (pre-)configured to include one or more SL resource pools. In some implementations of the present specification, at least one resource pool may be (pre-)configured to include an integer number of RB sets, where an RB set may correspond to about 20 MHz. In some implementations of the present specification, if a resource pool includes two adjacent RB sets, the RB(s) within the intra-cell guard band of the two adjacent RB sets may be defined as belonging to the resource pool. In some implementations of the present specification, interlaced RB-based transmission may be configured for PSCCH / PSSCH transmission for the SL BWP. If the UE is not configured to use interlaced RB-based PSCCH / PSSCH transmission for SL BWP, or if contiguous-RB-based transmission is configured, the UE may perform PSCCH / PSSCH transmission using contiguous-RB-based transmission.

[0145] For SL transmission on shared spectrum, the TX UE needs to perform LBT for channel access. UEs can occupy channels for the time indicated by the COT duration. Considering the aforementioned SL communication and shared spectrum channel access, the question arises of how to support resource reservation for SL communication on shared spectrum. For example, if reserved resources cannot be used due to LBT failure, i) blind retransmission handling and / or ii) resource reservation handling become issues.

[0146] In some implementations of this specification, considering the SL communication and shared spectrum channel access described above, the following may be considered for resource reservation of SL communication on shared spectrum.

[0147] > COT Duration T COT is indicated by the SCI format.

[0148] > As previously explained, a resource reservation period (RRP) instruction may be used.

[0149] > As previously explained, time domain resource assignment (TDRA) instructions may be used.

[0150] > As previously explained, frequency domain resource assignment (FDRA) instructions based on X+Y can be used.

[0151] FIG. 15 illustrates an example of resource reservation for communication between devices on a shared spectrum according to some implementations of this specification.

[0152] In some implementations of this specification, for blind retransmission handling, it may be specified that resource reservation for retransmission is not allowed outside the COT duration. Referring to Figure 15, TRIV is in the range [0, T COT ] can be directed within the RX UE. The RX UE is t max > T COT It is not expected to receive a TRIV value, where t max can be the largest value among the reservation resource slots indicated by TRIV. For example, if slots 0, 2, and 4 are indicated by TRIV, then t max = 4. Referring to FIG. 15, in some implementations, the TX UE does not perform SL transmission in the resource reserved for slot 15 among the reserved resources, and the RX UE does not expect SL reception in the resource reserved for slot 15. The TDRA field size can be determined by:

[0153] > Alt 1-1. In some implementations, the TDRA field size is T COT can be fixed regardless (e.g., 5-bit).

[0154] > Alt 1-2. Alternatively, in some implementations the TDRA field size is indicated by the T COT may vary depending on the TDRA field size, for example, the RX UE may use Ceil(log2(T COT ))-bit. The TDRA field size is T COT If you depend on T COT Since the TDRA field size can be reduced compared to the TDRA field size determined by assuming the maximum value that can be given as T, the bit(s) corresponding to the difference can be used for other purposes. Alternatively, since the size of the SCI format is reduced, the SCI format can be transmitted at a lower code rate, so that the TDRA field size is T COTSCI formats that rely on it can be transmitted with higher reliability than SCI formats that do not.

[0155] Figure 16 illustrates another example of resource reservation for wireless communication (e.g., device-to-device communication) on a shared spectrum according to some implementations of the present specification. In the example of Figure 16, two COT durations (e.g., T) are allocated at different times by a UE initiating the same COT. COT #1 and T COT #2) This is indicated.

[0156] Unlike the example in Figure 15, in some implementations of this specification, for blind retransmission handling, resource reservation for retransmission may be stipulated to be allowed outside the COT duration. TRIV is T COT Regardless of 1 st - The step SCI can be indicated within the range [0, 31] of the window W (e.g., 32 slots) starting from the slot in which it is transmitted. Referring to Fig. 16, t k >T COT Resources reserved in #1 may or may not be valid depending on the LBT results.

[0157] > Alt 2-1. In some implementations of this specification, the TX UE and / or the RX UE may have a first COT duration T COT For the resource reserved outside of #1 (hereinafter, reserved resource #15), the next COT duration T COT #2 Resource availability can be determined based on the TX UE / RX UE's second COT duration T. For example, if the TX UE / RX UE's second COT duration T COT If #2 is transmitted / received and the reserved resource #15 is within the second COT duration, the reserved resource #15 may be determined to be valid. Otherwise, the TX UE / RX UE may determine that the reserved resource #15 is invalid.

[0158] Figure 17 illustrates another example of resource reservation for wireless communication on a shared spectrum according to some implementations of the present specification. In the example of Figure 17, two COT durations (e.g., T) are allocated at different times by a UE initiating the same COT. COT #1 and T COT #2) This is indicated.

[0159] As in the example of Figure 16, in some implementations of this specification, for blind retransmission handling, it may be stipulated that resource reservation for retransmission is allowed outside the COT duration.

[0160] > Alt 2-2. Automatic time shift for reserved resources

[0161] In some implementations, unlike the example of FIG. 16, automatic time transition may be performed for resources reserved outside the COT duration, as in the example of FIG. 17. Referring to FIG. 17, a TX UE and / or a RX UE may be configured to initiate a first COT duration T COT #1 outside t k With respect to the reserved resource (hereinafter, reserved resource #12), the TX UE / RX UE may receive the second COT duration T COT If #2 is sent / received and the reserved resource #12 is not within the second COT duration, then t k Originally reserved resource #12 in t k ' = t k + △t can be transitioned. Alternatively, referring to FIG. 17, the TX UE and / or the RX UE may be transitioned for a first COT duration T COT #1 outside t k The resource reserved in (hereinafter, reserved resource #12) is t k ' = t k + transition by △t, t k'If the LBT is successful within the COT duration, the transferred reservation resource can be considered valid for SL transmission / reception. In some implementations of this specification, t k ' can be determined by:

[0162] >> Alt 2-2-1. t k ' may be the first slot of the second COT duration.

[0163] >> Alt 2-2-1. t k ' can be (pre-)set. For example, t k ' may be a value preset by the BS or a value preset by a parameter built into the UE. In this case, t k 'If the above 2nd COT duration is not within the above, the reserved resource is dropped.

[0164] FIG. 18 illustrates further examples of resource reservation for wireless communication over shared spectrum according to some implementations of the present specification.

[0165] In some implementations of this specification, blind retransmissions may be handled based on dynamic indications. Since the PSCCH carrying SCI Format 1-A is transmitted every time a PSSCH is transmitted, the TX UE may utilize SCI Format 1-A to provide dynamic indications to the RX UE(s). For example, the following may be considered.

[0166] > Alt 3-1. Dynamic indication of the availability of reserved resources may be provided. For example, referring to Fig. 18(a), the SCI format 1-A transmitted with the initial transmission at time t0 (e.g., slot t0) may include information about t1 and t2 (e.g., resource time offsets) to indicate a reserved second resource at time t1 (e.g., slot t1) and a reserved third resource at time t2 (e.g., slot t2) (for the transport block of the initial transmission). 1 in the reserved resource at time t1 st SCI format 1-A transmitted with retransmission (1 above) st Information about the time t2 of the third resource (e.g., resource time offset) based on the time t1 at which the retransmission was performed, and 2 nd It may include an availability indication for retransmission. According to the availability indication, the above 2 nd Retransmission may or may not be valid.

[0167] > Alt 3-2. Dynamic instructions for updated TRIVs can be provided. For example, the following methods can be considered:

[0168] >> Alt 3-2-1. Referring to Fig. 18(b), 1 st The SCI format 1-A transmitted with the retransmission may indicate a new t2' value (e.g., resource time offset from t1). In this case, the latest t2' may override the previous value. That is, the UE may nd The slot for retransmission can be determined as t2'.

[0169] >> Alt 3-2-2. Referring to Fig. 18(c), 1 stThe SCI format 1-A transmitted with the retransmission may indicate the slot offset △t from the previous t2. The UE considers both the t2 value indicated by the SCI format 1-A transmitted with the initial transmission and the above △t value to determine 2 nd The slot for retransmission can be determined as t2'=t2+△t.

[0170] Although the implementations of this specification have been described above using sidelink communication as an example, the implementations of this specification can be applied to communication between devices regardless of their name.

[0171] FIG. 19 is an example of a process in which a communication device performs wireless channel transmission according to some implementations of the present specification.

[0172] A communication device (hereinafter, TX UE) can receive (from a BS or another communication device) configuration(s) for wireless channel communication via upper layer signaling (e.g., RRC signaling). The TX UE can be the first wireless device of FIG. 2 or the second wireless device of FIG. 2. The configuration(s) are the configuration(s) described above in relation to wireless channel communication (e.g., BWP configuration for communication between devices, number of subchannels L, number of RBs per subchannel N). sub , and / or the number of RBs for the wireless shared channelN PSSCH Or L subCH etc.), and / or may include interlace-related settings. The above setting(s) may include a setting regarding the maximum number N of wireless shared channel / wireless control channel resources that may be indicated by control information.

[0173] A TX UE may perform operations according to some implementations of the present disclosure in connection with wireless channel transmission. The TX UE may include at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A processing device for the TX UE may include at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program comprising instructions that, when executed by the at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer program or computer program product may be recorded on at least one computer-readable (non-transitory) storage medium and may contain instructions that, when executed, cause (at least one processor) to perform operations according to some implementations of the present specification.

[0174] In the TX UE, the processing device, the computer-readable (non-transitory) storage medium, and / or the computer program product, the operations may include: determining a first resource, a second resource, and a third resource for wireless communication within a resource pool on a cell (S1901); generating a first control information format including time information about the second resource and the third resource; transmitting a first physical control channel carrying the first control information format and an associated first physical shared channel within the first resource (S1903); and transmitting a second physical control channel carrying the second control information format and an associated second physical shared channel within the second resource (S1905). The second control information format may include information related to availability of the third resource. The operations may include: determining whether to perform wireless channel transmission on the third resource based on the information related to availability of the third resource.

[0175] In some implementations, the operations may include: performing an LBT prior to a slot including the third resource; and determining the availability of the third resource based on a result of the LBT. For example, the operations may: determine that the third resource is available based on a success of the LBT, and set the availability-related information in the second control information format. In another example, the operations may: determine that the third resource is unavailable based on a failure of the LBT, and set the availability-related information in the second control information format.

[0176] In some implementations, the LBT may be performed based on shared spectrum channel access related parameters being set for the cell.

[0177] In some implementations, the operations may further include: transmitting a third physical control channel and an associated third physical shared channel carrying a third control information format within the third resource, based on the availability of the third resource.

[0178] In some implementations, the availability-related information of the third resource in the second control information format may include time information of the fourth resource that will replace the third resource.

[0179] In some implementations, the time information of the fourth resource may include a slot offset from the third resource to the fourth resource.

[0180] In some implementations, the operations may further include transmitting a third physical control channel carrying a third control information format within the fourth resource and an associated third physical shared channel.

[0181] In some implementations, the operations may further include: receiving a setting regarding a maximum number N of reserved resources indicated by the control information, wherein N > 2.

[0182] In some implementations, each of the first, second and third resources is L subCH It can contain dog subchannels.

[0183] An RX UE may perform operations according to some implementations of the present disclosure in connection with receiving a wireless channel. The RX UE may include at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A processing device for the RX UE may include at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable (non-transitory) storage medium may store at least one computer program comprising instructions that, when executed by the at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer program or computer program product may be recorded on at least one computer-readable (non-transitory) storage medium and may contain instructions that, when executed, cause (at least one processor) to perform operations according to some implementations of the present specification.

[0184] In the RX UE, the processing device, the computer-readable (non-transitory) storage medium, and / or the computer program product, the operations may include: detecting (S2001) a first physical control channel carrying a first control information format in a first resource within a resource pool on a cell. The first control information format may include time information regarding a second resource and a third resource. The operations may include determining a first resource, a second resource, and a third resource based on the first control information format. The operations may include: receiving an associated first physical shared channel within the first resource in which the first physical control channel is detected; and receiving a second physical control channel H carrying a second control information format and an associated second physical shared channel within the second resource (S2003). In some implementations, the second control information format may include information regarding availability of the third resource. In some implementations, the operations may include: determining whether the third resource is valid based on the information regarding availability of the third resource.

[0185] In some implementations, the operations may include: if the third resource is valid, attempting to detect a third physical control channel carrying a third control information format in the third resource, and if the third physical control channel is detected, attempting to decode an associated third physical shared channel.

[0186] In some implementations, the actions may include: not attempting to detect a physical control channel on the third resource if the third resource is invalid. For example, in some implementations, the actions may include: not performing physical control channel monitoring on the lowest subchannel of the third resource if the third resource is invalid.

[0187] In some implementations, the availability-related information of the third resource in the second control information format may include time information of the fourth resource that will replace the third resource.

[0188] In some implementations, the time information of the fourth resource may include a slot offset from the third resource to the fourth resource.

[0189] In some implementations, the operations may further include: receiving a setting regarding a maximum number N of reserved resources indicated by the control information, wherein N > 2.

[0190] In some implementations, each of the first, second and third resources is L subCH It can contain dog subchannels.

[0191] In some implementations, based on the shared spectrum channel access related parameters set for the cell, the second control information format may further include information related to the availability of the third resource.

[0192] According to some implementations, radio channel retransmissions can be performed even if radio resources(s) are reserved on a cell in a shared spectrum outside the COT duration. Alternatively, according to some implementations of the present specification, radio resources for retransmissions can be reliably reserved on a cell in a shared spectrum. According to some implementations of the present specification, the risk that a TX UE and a RX UE interpret radio resources used for radio channel transmissions by the TX UE differently can be reduced.

[0193] As described above, the examples disclosed herein are provided to enable those skilled in the art to implement and practice the present disclosure. While the examples have been described above with reference to the examples of the present disclosure, those skilled in the art will appreciate that various modifications and variations may be made to the examples of the present disclosure. Accordingly, the present disclosure is not intended to be limited to the examples described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0194] Implementations of this specification can be used in wireless communication systems, BSs, user equipment, and other equipment.

Claims

1. In a wireless communication system, when a communication device transmits a wireless channel, Determine the first resource, the second resource and the third resource for wireless communication within the resource pool on the cell; Generating a first control information format including time information regarding the second resource and the third resource; Transmitting a first physical control channel and an associated first physical shared channel carrying the first control information format within the first resource; and A second physical control channel carrying a second control information format within the second resource and transmitting an associated second physical shared channel, wherein the second control information format includes information related to the availability of the third resource; and Based on the availability information of the third resource, determining whether to perform wireless channel transmission on the third resource, Method of transmitting a wireless channel.

2. In paragraph 1, Further comprising transmitting a third physical control channel and an associated third physical shared channel carrying a third control information format within the third resource based on the availability of the third resource. Method of transmitting a wireless channel.

3. In paragraph 1, The availability-related information of the third resource in the second control information format includes time information of the fourth resource that will replace the third resource. Method of transmitting a wireless channel.

4. In paragraph 3, The time information of the fourth resource includes a slot offset from the third resource to the fourth resource. Method of transmitting a wireless channel.

5. In paragraph 3, Further comprising transmitting a third physical control channel and an associated third physical shared channel carrying a third control information format within the fourth resource. Method of transmitting a wireless channel.

6. In paragraph 1, Further comprising receiving a setting regarding the maximum number N of reserved resources indicated by the control information, wherein N > 2, Method of transmitting a wireless channel.

7. In paragraph 1, Each of the above first, second and third resources is L subCH including a dog subchannel, Method of transmitting a wireless channel.

8. In paragraph 1, Further comprising performing LBT (listen-before-talk) before performing transmission on the cell based on the cell being set to shared spectrum channel access. Method of transmitting a wireless channel.

9. In a wireless communication system, when a communication device transmits a wireless channel, At least one transmitter / receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations, said operations comprising: Determine the first resource, the second resource and the third resource for wireless communication within the resource pool on the cell; Generating a first control information format including time information regarding the second resource and the third resource; Transmitting a first physical control channel and an associated first physical shared channel carrying the first control information format within the first resource; and A second physical control channel carrying a second control information format within the second resource and transmitting an associated second physical shared channel, wherein the second control information format includes information related to the availability of the third resource; and Based on the availability information of the third resource, determining whether to perform wireless channel transmission on the third resource, Communication device.

10. A computer-readable non-transitory storage medium comprising at least one computer program that causes at least one processor to perform operations, the operations comprising: Determine the first resource, the second resource and the third resource for wireless communication within the resource pool on the cell; Generating a first control information format including time information regarding the second resource and the third resource; Transmitting a first physical control channel and an associated first physical shared channel carrying the first control information format within the first resource; and A second physical control channel carrying a second control information format within the second resource and transmitting an associated second physical shared channel, wherein the second control information format includes information related to the availability of the third resource; and Based on the availability information of the third resource, determining whether to perform wireless channel transmission on the third resource, Storage media.

11. When a communication device receives a wireless channel in a wireless communication system, A first physical control channel carrying a first control information format is detected from a first resource in a resource pool on a cell, wherein the first control information format includes time information regarding a second resource and a third resource; Receive an associated first physical shared channel within the first resource in which the first physical control channel is detected; Receiving a second physical control channel and an associated second physical shared channel carrying a second control information format within the second resource, the second control information format including information related to the availability of the third resource; and Based on information related to the availability of the third resource, determining whether the third resource is valid, How to receive wireless channels.

12. In paragraph 11, The availability-related information of the third resource in the second control information format includes time information of the fourth resource that will replace the third resource. How to receive wireless channels.

13. In paragraph 12, The time information of the fourth resource includes a slot offset from the third resource to the fourth resource. How to receive wireless channels.

14. In paragraph 12, Further comprising receiving a third physical control channel carrying a third control information format within the fourth resource and an associated third physical shared channel, How to receive wireless channels.

15. In paragraph 11, Further comprising receiving a setting regarding the maximum number N of reserved resources indicated by the control information, wherein N > 2, How to receive wireless channels.

16. In paragraph 11, Each of the above first, second and third resources is L subCH including a dog subchannel, How to receive wireless channels.

17. In paragraph 16, Based on the above cell being set to shared spectrum channel access, the second control information format includes information related to the availability of the third resource. How to receive wireless channels.

18. In a wireless communication system, when a communication device receives a wireless channel, At least one transmitter / receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations, said operations comprising: A first physical control channel carrying a first control information format is detected from a first resource in a resource pool on a cell, wherein the first control information format includes time information regarding a second resource and a third resource; Receive an associated first physical shared channel within the first resource in which the first physical control channel is detected; Receive a second physical control channel H carrying a second control information format within the second resource and an associated second physical shared channel, wherein the second control information format includes information related to the availability of the third resource; and Based on information related to the availability of the third resource, determining whether the third resource is valid, Communication device.

19. A computer-readable non-transitory storage medium comprising at least one computer program that causes at least one processor to perform operations, the operations comprising: A first physical control channel carrying a first control information format is detected from a first resource in a resource pool on a cell, wherein the first control information format includes time information regarding a second resource and a third resource; Receive an associated first physical shared channel within the first resource in which the first physical control channel is detected; Receiving a second physical control channel and an associated second physical shared channel carrying a second control information format within the second resource, the second control information format including information related to the availability of the third resource; and Based on information related to the availability of the third resource, determining whether the third resource is valid, Storage media.

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