Preemption of sidelink resources in unlicensed frequency bands

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a first user equipment (UE) may transmit first sidelink control information (SCI) indicating a first reservation of sidelink resources corresponding to an unlicensed sidelink band. The UE may receive a second SCI indicating a second reservation of the sidelink resource. The UE may determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or an additional UE. The UE may perform a sidelink resource allocation operation based on the preemption state. Numerous other aspects are described.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for preemption of sidelink resources in unlicensed bands. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0003] A wireless network may include one or more network nodes that support communications for wireless communication devices, such as user equipment (UE) or multiple UEs. A UE may communicate with a network node via downlink communications and uplink communications. A "downlink" (or "DL") refers to a communication link from a network node to a UE, and an "uplink" (or "UL") refers to a communication link from a UE to a network node. Some wireless networks may support device-to-device communications, such as via a local link (e.g., a side link (SL), a wireless local area network (WLAN) link, and / or a wireless personal area network (WPAN) link, etc.).

[0004] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a city, country, region and / or global level. New Radio (NR) (which may be referred to as 5G) is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) on the downlink, using CP-OFDM and / or single carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR and other radio access technologies remain useful. Summary of the invention

[0005] Some aspects described herein relate to a first user equipment (UE) for wireless communication. The first user equipment may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to send a first side link control information (SCI) indicating a first reservation for a side link resource corresponding to an unlicensed side link frequency band. The one or more processors may be configured to receive a second SCI indicating a second reservation for the side link resource. The one or more processors may be configured to determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or the additional UE. The one or more processors may be configured to perform a side link resource allocation operation based on the preemption state.

[0006] Some aspects described herein relate to a method of wireless communication performed by a first UE. The method may include sending a first SCI indicating a first reservation by the first UE for a side link resource corresponding to an unlicensed side link frequency band for a first side link communication. The method may include receiving a second SCI indicating a second reservation by a second UE for the side link resource for a second side link communication. The method may include determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE. The method may include performing a side link resource allocation operation based on the preemption state.

[0007] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include a component for sending a first SCI indicating a first reservation by the apparatus for a first side link communication for a side link resource corresponding to an unlicensed side link frequency band. The apparatus may include a component for receiving a second SCI indicating a second reservation by a UE for a second side link communication for the side link resource. The apparatus may include a component for determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the apparatus, the UE, or an additional UE. The apparatus may include a component for performing a side link resource allocation operation based on the preemption state.

[0008] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a first UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to send a first SCI indicating a first reservation of a side link resource corresponding to an unlicensed side link frequency band by the first UE for a first side link communication. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive a second SCI indicating a second reservation of the side link resource by a second UE for a second side link communication. The instruction set, when executed by one or more processors of the UE, may cause the UE to determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to perform a side link resource allocation operation based on the preemption state.

[0009] The various aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, network entities, network nodes, wireless communication devices and / or processing systems as fully described herein with reference to the drawings and description and as illustrated in the drawings and description.

[0010] The features and technical advantages of examples according to the present disclosure have been outlined quite broadly above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims.

[0011] Although various aspects are described in the present disclosure by illustrating some examples, it will be understood by those skilled in the art that such aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip implementations or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, and / or artificial intelligence devices). Various aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components and / or system-level components. The equipment incorporating the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include one or more components (e.g., hardware components, including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders and / or summers) for analog and digital purposes. The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements, and / or end-user devices of various sizes, shapes and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to fully understand the above-mentioned features of the present disclosure, a more specific description of the invention briefly summarized above can be obtained by referring to various aspects (some of which are illustrated in the accompanying drawings). However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit of other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0013] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0014] Figure 2 is a diagram illustrating an example of communication between a network node and a user equipment (UE) in a wireless network according to the present disclosure.

[0015] Figure 3 is a diagram illustrating an example of side link communication according to the present disclosure.

[0016] FIG. 4A to FIG. 4C is a diagram illustrating an example associated with resource selection for sidelink communication according to the present disclosure.

[0017] Figure 5 is a diagram illustrating an example associated with preemption of side link resources in an unlicensed band according to the present disclosure.

[0018] Figure 6is a diagram illustrating an example process performed, for example, by a first UE according to the present disclosure.

[0019] Figure 7 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0020] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. It should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functions, or structures and functions in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

[0021] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0022] Although various aspects may be described herein using terms generally associated with 5G or new radio (NR) radio access technology (RAT), various aspects of the present disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or post-5G RATs (e.g., 6G).

[0023] Figure 11 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, or may include elements of a 5G (e.g., NR) network and / or elements of a 4G (e.g., Long Term Evolution (LTE)) network, as well as other examples. The wireless network 100 may include one or more network nodes 110 (shown as network node 110a, network node 110b, network node 110c, and network node 110d), user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other entities. The network node 110 is a network node that communicates with the UE 120. As shown in the figure, the network node 110 may include one or more network nodes. For example, the network node 110 may be a converged network node, which means that the converged network node is configured to utilize a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node (e.g., within a single device or unit). For another example, the network node 110 may be a decomposed network node (sometimes referred to as a decomposed base station), which means that the network node 110 is configured to utilize a protocol stack that is physically or logically distributed between two or more nodes (such as one or more central units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)).

[0024] In some examples, the network node 110 is or includes a network node (such as an RU) that communicates with the UE 120 via a radio access link. In some examples, the network node 110 is or includes a network node (such as a DU) that communicates with other network nodes 110 via a fronthaul link or a midhaul link. In some examples, the network node 110 is or includes a network node (such as a CU) that communicates with other network nodes 110 via a midhaul link or communicates with a core network via a backhaul link. In some examples, the network node 110 (such as an aggregated network node 110 or a decomposed network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. The network node 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, a transmit receive point (TRP), a DU, a RU, a CU, a mobility element of a network, a core network node, a network element, a network equipment, a RAN node, or a combination thereof. In some examples, network nodes 110 may be interconnected to each other or to one or more other network nodes 110 in wireless network 100 via various types of fronthaul, midhaul, and / or backhaul interfaces (such as direct physical connections, air interfaces, or virtual networks) using any suitable transport network.

[0025] In some examples, the network node 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP), the term "cell" may refer to the coverage area of ​​the network node 110 and / or the network node subsystem serving the coverage area, depending on the context in which the term is used. The network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by a UE 120 with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by a UE 120 associated with the femto cell (e.g., a UE 120 in a closed subscriber group (CSG)). A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. The network node 110 for a femto cell may be referred to as a femto network node or a home network node. Figure 1 In the example shown, network node 110a may be a macro network node for macro cell 102a, network node 110b may be a pico network node for pico cell 102b, and network node 110c may be a femto network node for femto cell 102c. A network node may support one or more (e.g., three) cells. In some examples, a cell may not necessarily be stationary, and the geographic area of ​​a cell may move depending on the location of a mobile network node 110 (e.g., a mobile network node).

[0026] In some aspects, the term "base station" or "network node" may refer to a converged base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, or one or more components thereof. For example, in some aspects, a "base station" or "network node" may refer to a CU, a DU, a RU, a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network node" may refer to a device configured to perform one or more functions (such as those described herein in conjunction with the network node 110). In some aspects, the term "base station" or "network node" may refer to a plurality of devices configured to perform one or more functions. For example, in some distributed systems, each of a number of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to repeat the execution of at least a portion of the function, and the term "base station" or "network node" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one of the base station functions but not another base station function. In this way, a single device may include more than one base station.

[0027] The wireless network 100 may include one or more relay stations. A relay station is a network node that can receive transmissions of data from an upstream node (e.g., a network node 110 or a UE 120) and transmit transmissions of data to a downstream node (e.g., a UE 120 or a network node 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown, a network node 110d (e.g., a relay network node) may communicate with a network node 110a (e.g., a macro network node) and a UE 120d to facilitate communication between the network node 110a and the UE 120d. A network node 110 that relays communications may be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay, etc.

[0028] The wireless network 100 may be a heterogeneous network that includes different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, etc. These different types of network nodes 110 may have different transmit power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, a macro network node may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico network node, a femto network node, and a relay network node may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0029] The network controller 130 may be coupled to or in communication with a set of network nodes 110 and may provide coordination and control for the network nodes 110. The network controller 130 may communicate with the network nodes 110 via a backhaul communication link or a midhaul communication link. The network nodes 110 may also communicate directly with each other or indirectly via a wireless backhaul communication link or a wired backhaul communication link. In some aspects, the network controller 130 may be or may include a CU or a core network device.

[0030] UE 120 can be distributed throughout the wireless network 100, and each UE 120 can be stationary or mobile. UE 120 can include, for example, an access terminal, a terminal, a mobile station and / or a subscriber unit. UE 120 can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, a UE function of a network node and / or any other suitable device configured to communicate via a wireless or wired medium.

[0031] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that may communicate with a network node, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operationally coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0032] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0033] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using network node 110 as an intermediary to communicate with each other) using one or more side link channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by network node 110.

[0034] The devices of the wireless network 100 may communicate using an electromagnetic spectrum that may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, the devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency ranges designated FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). It should be understood that, although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the “below 6 GHz” band in various documents and articles. Similar naming issues sometimes occur with respect to FR2, which is often (interchangeably) referred to as the “millimeter wave” band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0035] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz–24.25GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and thus the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6GHz–71GHz), FR4 (52.6GHz–114.25GHz), and FR5 (114.25GHz–300GHz). Each of these higher frequency bands falls within the EHF band.

[0036] In view of the above examples, unless otherwise specifically stated, it should be understood that if the term "below 6 GHz" or the like is used herein, the term can be broadly referred to as frequencies that can be lower than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used herein, the term can be broadly referred to as frequencies that can include mid-band frequencies, can be within FR2, FR4, FR4-a or FR4-1 and / or FR5, or can be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0037] In some aspects, UE 120 may include communication manager 140. As described in more detail elsewhere herein, communication manager 140 may send first sidelink control information (SCI) indicating a first reservation for sidelink resources corresponding to an unlicensed sidelink frequency band; receive a second SCI indicating a second reservation for the sidelink resources; determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or the additional UE; and perform a sidelink resource allocation operation based on the preemption state. Additionally or alternatively, communication manager 140 may perform one or more other operations described herein.

[0038] As indicated above, Figure 1 are provided as examples. Other examples can be found in the Figure 1 The examples described are different.

[0039] Figure 2 2 is a diagram illustrating an example 200 of a network node 110 communicating with a UE 120 in a wireless network 100 according to the present disclosure. The network node 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). The UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1). The network node 110 of example 200 includes one or more radio frequency components, such as an antenna 234 and a modem 254. In some examples, the network node 110 may include an interface, a communication component, or another component that facilitates communication with the UE 120 or another network node. Some network nodes 110 may not include a radio frequency component that facilitates direct communication with the UE 120, such as one or more CUs or one or more DUs.

[0040] At the network node 110, the transmit processor 220 may receive data intended for the UE 120 (or a set of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQI) received from the UE 120. The network node 110 may process (e.g., encode and modulate) the data for the UE 120 based at least in part on the MCS selected for the UE 120, and may provide data symbols for the UE 120. The transmit processor 220 may process system information (e.g., for semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems) (shown as modems 232a to 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may also process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 232t may transmit a set of downlink signals (e.g., T downlink signals) via a set of corresponding antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0041] At the UE 120, a set of antennas 252 (shown as antennas 252a to 252r) may receive downlink signals from the network node 110 and / or other network nodes 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) (shown as modems 254a to 254r). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the received signal to obtain input samples. Each modem 254 may use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from the modem 254, may perform MIMO detection on the received symbols where applicable, and may provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260, and may provide decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, among other things. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0042] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the network node 110 via the communication unit 294.

[0043] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more groups of antenna elements, and / or one or more antenna arrays, etc. An antenna panel, an antenna group, a group of antenna elements, and / or an antenna array may include one or more antenna elements (in a single housing or multiple housings), a group of coplanar antenna elements, a group of non-coplanar antenna elements, and / or may be coupled to one or more transmit and / or receive components (such as, Figure 2 One or more antenna elements of one or more components).

[0044] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-decoded by the TX MIMO processor 266, where applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the network node 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform operations described herein (eg, with reference to Figures 5 to 7 ) or any aspects of any of the methods described herein.

[0045] At the network node 110, uplink signals from the UE 120 and / or other UEs may be received by the antenna 234, processed by the modem 232 (e.g., a demodulator component (shown as DEMOD) of the modem 232), detected by the MIMO detector 236 (where applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The network node 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network node 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink communication and / or uplink communication. In some examples, the modem 232 of the network node 110 may include a modulator and a demodulator. In some examples, the network node 110 includes a transceiver. The transceiver may include any combination of antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform operations described herein (e.g., with reference to Figures 5 to 7 ) or any aspects of any of the methods described herein.

[0046] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components of the network node 110 may perform one or more techniques associated with preemption of sidelink resources in an unlicensed band as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 6 600 and / or operations of other processes as described herein. Memory 242 and memory 282 may store data and program codes for network node 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed by one or more processors of network node 110 and / or UE 120 (e.g., directly, or after compilation, conversion and / or interpretation), may cause the one or more processors, UE 120 and / or network node 110 to perform or direct, for example, Figure 6 The process 600 and / or operations of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, etc.

[0047] In some aspects, a first UE (e.g., UE 120) includes: means for sending a first SCI indicating a first reservation of a sidelink resource corresponding to an unlicensed sidelink frequency band by the first UE for a first sidelink communication; means for receiving a second SCI indicating a second reservation of the sidelink resource by a second UE for a second sidelink communication; means for determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE; and / or means for performing a sidelink resource allocation operation based on the preemption state. Means for performing operations described herein for the first UE may include, for example, one or more of the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0048] Although Figure 2The blocks in the 2000 and 2010 are illustrated as distinct components, but the functionality described above for these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described for the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0049] As indicated above, Figure 2 are provided as examples. Other examples can be found in the Figure 2 The examples described are different.

[0050] The deployment of a communication system (such as a 5G NR system) can be arranged with various components or components in a variety of ways. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a RAN node, a core network node, a network element, a base station or network equipment can be implemented in an aggregated or decomposed architecture. For example, a base station (such as a node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a TRP or a cell, etc.) or one or more units (or one or more components) that perform base station functionality can be implemented as an aggregated base station (also called an independent base station or a monolithic base station) or a decomposed base station. A "network entity" or a "network node" may refer to a decomposed base station or one or more units of a decomposed base station (such as one or more CUs, one or more DUs, one or more RUs, or a combination thereof).

[0051] An aggregated base station (e.g., an aggregated network node) can be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). A decomposed base station (e.g., a decomposed network node) can be configured to utilize a protocol stack that is physically or logically distributed between two or more units (such as one or more CUs, one or more DUs, or one or more RUs). In some examples, the CU can be implemented within a network node, and one or more DUs can be co-located with the CU, or alternatively, can be geographically or virtually distributed across one or more other network nodes. The DU can be implemented to communicate with one or more RUs. Each of the CU, DU, and RU can also be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), and the like.

[0052] Base station type operations or network designs may take into account the aggregated nature of base station functionality. For example, a decomposed base station may be utilized in an IAB network, an open radio access network (O-RAN (such as a network configuration initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate the scaling of a communication system by separating base station functionality into one or more units that can be deployed separately. A decomposed base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented virtually for at least one unit, which may enable flexibility in network design. Individual units of a decomposed base station may be configured for wired or wireless communication with at least one other unit of the decomposed base station.

[0053] Figure 3 is a diagram illustrating an example 300 of sidelink communications according to the present disclosure.

[0054] like Figure 3 As shown in , the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more side link channels 310. UEs 305-1 and 305-2 can communicate using one or more side link channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication and / or V2P communication) and / or mesh networks. In some aspects, UE 305 (e.g., UE 305-1 and / or UE 305-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, one or more side link channels 310 may use a PC5 interface and / or may operate in a high frequency band (e.g., a 5.9 GHz band). Additionally or alternatively, UE 305 may use global navigation satellite system (GNSS) timing to synchronize the timing of a transmit time interval (TTI) (e.g., a frame, subframe, time slot, or symbol).

[0055] like Figure 3As further shown, the one or more sidelink channels 310 may include a physical sidelink control channel (PSCCH) 315, a physical sidelink shared channel (PSSCH) 320, and / or a physical sidelink feedback channel (PSFCH) 325. The PSCCH 315 may be used to communicate control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communication with the network node 110 via an access link or access channel. The PSSCH 320 may be used to communicate data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communication with the network node 110 via an access link or access channel. For example, the PSCCH 315 may carry an SCI 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, and / or space resources), wherein a transport block (TB) 335 may be carried on the PSSCH 320. The TB 335 may include data. The PSFCH 325 may be used to communicate sidelink feedback 340, such as hybrid automatic repeat request (HARQ) feedback (eg, acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), and / or scheduling requests (SR).

[0056] Although shown on PSCCH 315, in some aspects, SCI 330 may include multiple communications in different levels, such as a first level SCI (SCI-1) and a second level SCI (SCI-2). SCI-1 may be sent on PSCCH 315. SCI-2 may be sent on PSSCH 320. SCI-1 may include, for example, an indication of one or more resources (e.g., time resources, frequency resources, and / or space resources) on PSSCH 320, information for decoding sidelink communications on PSSCH, quality of service (QoS) priority value, resource reservation period, PSSCH DMRS pattern, SCI format for SCI-2, beta offset for SCI-2, number of PSSCH DMRS ports, and / or MCS. SCI-2 may include information associated with data transmission on PSSCH 320, such as a HARQ process ID, a new data indicator (NDI), a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.

[0057] In some aspects, one or more side link channels 310 may use a resource pool. A resource pool for side link transmission and side link reception may be defined. The resource pool may include one or more subchannels in the frequency domain and one or more time slots in the time domain. For example, the minimum resource allocation in the frequency domain may be a subchannel, and the minimum resource allocation in the time domain may be a time slot. In some aspects, one or more time slots in the resource pool may be unavailable for side link communication. For example, a scheduling assignment (e.g., included in SCI 330) may be sent in a subchannel across time using a specific resource block (RB). In some aspects, data transmission associated with a scheduling assignment (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and the associated data transmission are not sent on adjacent RBs.

[0058] In some aspects, the UE 305 may operate using a sidelink transmission mode (e.g., Mode 1) in which resource selection and / or scheduling is performed by a network node 110 (e.g., a base station, CU, or DU). For example, the UE 305 may receive a grant for sidelink channel access and / or scheduling from the network node 110 (e.g., directly or via one or more network nodes) (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as a grant for configuration). In some aspects, the UE 305 may operate using a transmission mode (e.g., Mode 2) in which resource selection and / or scheduling is performed by the UE 305 (e.g., instead of the network node 110). In some aspects, the UE 305 may perform resource selection and / or scheduling by sensing channel availability for transmission. For example, UE 305 may measure RSSI parameters associated with various side link channels (e.g., sidelink-RSSI (S-RSSI) parameters), may measure RSRP parameters associated with various side link channels (e.g., PSSCH-RSRP parameters), and / or may measure RSRQ parameters associated with various side link channels (e.g., PSSCH-RSRQ parameters), and may select a channel for sending side link communications based at least in part on the measurement results.

[0059] Additionally or alternatively, as herein combined FIG. 4A to FIG. 4C As described in more detail, the UE 305 may perform resource selection and / or scheduling using the SCI 330 received in the PSCCH 315, which may indicate occupied resources and / or channel parameters. Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling by determining a channel busy rate (CBR) associated with each sidelink channel, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 305 may use for a particular set of subframes).

[0060] In a transmission mode where resource selection and / or scheduling is performed by the UE 305, the UE 305 may generate a sidelink grant and may transmit the grant in the SCI 330. The sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks (e.g., for TB 335) to be used for an upcoming sidelink transmission on the PSSCH 320, one or more subframes to be used for an upcoming sidelink transmission, and / or an MCS to be used for an upcoming sidelink transmission. In some aspects, the UE 305 may generate a sidelink grant that indicates one or more parameters (such as the periodicity of the sidelink transmission) for semi-persistent scheduling (SPS). Additionally or alternatively, the UE 305 may generate a sidelink grant for event-driven scheduling (such as for an on-demand sidelink message).

[0061] As shown, the network node 350 may communicate with the UE 305-1 and / or the UE 305-2 (e.g., directly or via one or more network nodes), such as via an access link 355. The direct link between the UE 350-1 and the UE 350-2 (e.g., via a PC5 interface) may be referred to as a side link, and the direct link between the network node 350 and the UE 350-1 or 350-2 (e.g., via a Uu interface) may be referred to as an access link. Side link communications may be sent via a side link, and access link communications may be sent via an access link. Access link communications may be downlink communications (from the network node 350 to the UE 350-1 or 350-2) or uplink communications (from the UE 350-1 or 350-2 to the network node 350).

[0062] As indicated above, Figure 3 are provided as examples. Other examples can be found in relation to Figure 3 Described differently.

[0063] FIG. 4A to FIG. 4C 4 is a diagram illustrating examples 400, 402, and 404 associated with resource selection for sidelink communications according to the present disclosure. Example 400 illustrates a method for transmitting a resource to a UE (e.g., Figure 3 UE 350-1 and / or UE 350-2 and / or Figure 1 and Figure 2 The scheme for resource selection may include sensing the sidelink channel based on a resource selection window to select resources for sidelink communication. The UE may use a channel sensing procedure to select resources for sidelink communication, such as the above combined with Figure 3 as described.

[0064] In Mode 2, resource selection may include two steps. In the first step, the UE may identify candidate resources using a sensing procedure and / or an elimination procedure. In the second step, the UE may perform a resource selection procedure, in which the UE selects a candidate resource from the identified candidate resources. The selection may be performed by a higher protocol stack layer using random selection.

[0065] As shown by reference numeral 406, the UE may perform a sensing procedure in a sensing window. The sensing window is composed of a time slot range [n-T0, nT proc,0 ], where n is a resource selection (or reselection) trigger or time slot at which a new resource must be selected, T0 is configured to be 100 milliseconds (ms) (e.g., for aperiodic resource reservation, such as aperiodic reservation in one or more time slots up to 32 logical time slots in the future) or 1100 ms (e.g., for periodic resource reservation), and T proc,0 is the time required to complete the sensing procedure. In some cases, a UE configured for communication in an NR network may use the sensing procedure for aperiodic or periodic resource reservation.

[0066] According to the channel sensing procedure, the UE may decode control messages related to resource reservations of other UEs, and perform measurements associated with one or more side link channels (e.g., RSRP measurements and / or RSSI measurements, etc.). For example, the UE may send reservation information (e.g., in an SCI) indicating resource reservations for a current time slot (e.g., a time slot in which the reservation information is sent) and for one or more (e.g., up to two) future time slots. The resource allocation associated with the resource reservation may be one or more subchannels in the frequency domain and one time slot in the time domain. In some cases, the resource reservation may be aperiodic or periodic. In periodic resource reservation, the UE may signal a period (e.g., a value between 0 ms and 1000 ms) of the resource reservation (e.g., in the reservation information in the SCI). In some cases, the sensing procedure may be performed by the physical layer of the UE based on a request from the medium access control (MAC) layer of the UE.

[0067] As shown by reference numeral 408, the UE may determine, based at least in part on a resource selection trigger, to select resources for sidelink communication. For example, resource selection may be triggered when the UE has a packet to send or when the UE receives an indication to select (or reselect) a resource for a packet to be sent by the UE. Based at least in part on the resource selection trigger, the UE may determine one or more resources available for selection in a resource selection window. That is, the UE may determine the one or more available resources based at least in part on a channel sensing procedure performed by the UE. For example, the channel sensing procedure may provide an indication of occupied resources in the resource selection window and / or resources associated with high interference in the resource selection window.

[0068] As shown, if the resource selection trigger occurs at time slot n, the resource selection window may be from n+T1 to n+T2. In some aspects, T1 may be less than the processing time (T proc，1 In some aspects, T2 may be greater than or equal to T 2，min (which may be a value configured for the UE based at least in part on the priority of the UE) and is less than or equal to the remaining packet delay budget (PDB) for packets sent by the UE. The PDB is a constraint that specifies the maximum delay between the time a packet arrives and the time the packet was last sent. For example, a transmitter that arrives at a UE is associated with a PDB and a send amount (the number of times the packet is to be sent) for each packet sent by the transmitter. The PDB and send amount may differ between packets, depending on, for example, the application or service associated with the packet (e.g., in order to achieve a desired coverage, range, reliability, etc.).

[0069] The resource selection window may include all resources within the time slot range [n+T1, n+T2]. As shown, the UE may exclude resources in the resource selection window. In some cases, the UE may exclude resources related to half-duplex operation because a half-duplex UE cannot sense reservations from other UEs announced in the time slots in which the UE is transmitting in the sensing window. In some cases, the UE may exclude candidate resources based on reservations reserved from other UEs in SCI-1 transmissions detected during the sensing window.

[0070] The physical layer of the UE may report a candidate resource set to the MAC layer of the UE. The MAC layer randomly selects one or more resources in the reported candidate resource set for transmission. In some cases, the UE may reserve resources for HARQ transmission and / or retransmission, and resources for multiple PSSCHs of the same transmission block may be randomly selected by the MAC layer.

[0071] As shown in reference numeral 410, the UE may select a resource in a resource selection window. In some cases, the MAC layer of the UE may randomly select a side link resource from the available candidate resources reported by the physical layer of the UE. In order to select N candidate resources from the available candidate resources, the UE may first randomly select one of the N candidate resources. For example, a first candidate resource may be selected in time slot m1. Then, the UE may also randomly select a second candidate resource, where the restriction is that the gap between the second candidate resource and the first selected candidate resource must be less than a window W of 32 time slots. In this way, the second candidate resource should be located within the time slot range [m1-31, m1+31] (e.g., in time slot m2). If N is greater than 2, the UE may select a third candidate resource, where the restriction is that the third candidate resource is located within the range [m1-31, m1+31] or [m2-31, m2+31] (e.g., in time slot m3). The above procedure may be repeated until all N candidate resources are selected.

[0072] In some cases, the SCI may reserve resources for one, two, or three transmissions. The maximum number of reservations may be configurable or preconfigured (e.g., specified in a wireless communication standard). In some cases, all reservations may be used for the same number of subchannels. The starting subchannel may be different between reservations. In some cases, a transmitter UE may request feedback for a given transmission. In some cases, a transmitter UE may choose not to use a reservation based on feedback from other UEs. The reservation may be repeated with a signaled period (when enabled).

[0073] If the MAC layer of the UE requests the UE to determine a subset of resources from which the higher layer will select resources for PSSCH / PSCCH transmission as part of a re-evaluation or pre-emption procedure, the higher layer may provide a set of resources subject to re-evaluation (r0, r1, r2, ...) and a set of resources subject to pre-emption (r'0, r'1, r'2, ...). The UE may be configured to transmit in time slot r" i - Determine the resource subset (as requested by higher layers) before or after T3 (e.g., in time slot n'), where r" i is the time slot with the smallest time slot index among (r0, r1, r2, ...) and (r′0, r′1, r′2, ...), and T3 is equal to in is defined in time slots according to wireless communication standards, and where μ SL It is the subcarrier spacing (SCS) configuration of the sidelink bandwidth part (BWP).

[0074] In some cases, such as Figure 4BAs shown in example 402 of , the selected but not yet reserved resources may be reserved by another UE. In this case, a resource selection procedure (for re-evaluation) may be triggered. If the UE's physical layer indicates that a subset of resources (e.g., M resources) are selected but not yet reserved for re-evaluation, the UE's MAC layer may remove M resources from the N candidate resources and randomly select M new candidate resources from the available candidate resources within the new selection window.

[0075] Sidelink transmissions (interchangeably referred to herein as "communications") may have associated priorities. In some cases, a UE having a communication with a priority higher than or the same priority as another UE's communication may preempt the resource reservation of the other UE. For example, a first transmitter UE may reserve sidelink resources for a communication with a first priority. A transmitter UE is a UE that sends communications, is planning to send communications, is able to send communications, etc. A second transmitter UE may reserve the same sidelink resources for a communication with a second priority. If the second priority is higher than or equal to the first priority, the communication of the second transmitter UE may preempt the communication of the first UE, in which case the second transmitter UE may use the reserved resources for transmission, while the first transmitter UE does not use the resources for transmission. When multiple UEs compete for the same resources, this concept of preemption may facilitate the transmission of higher priority transmissions.

[0076] like Figure 4C As shown in example 404, if the resource meets a set of conditions, the physical layer of the UE may report the preemption of the resource to the MAC layer of the UE. In some cases, when the resource is occupied by another UE (with priority prio RX ) when reserved and the priority is prio RX The resource satisfies the set of conditions if one of the two priority conditions is met. The first priority condition (condition 1) may indicate that sl-PreemptionEnable is provided and equal to "enabled" and prio TX >prio RX , because higher priority values ​​(e.g., prio RX , prio TX ) corresponds to a lower priority. The second priority condition may indicate that sl-PreemptionEnable is provided and is not equal to "enabled", and prio RX <prio pre And prio TX >prio RX , where prio pre is the priority threshold configured by sl-PreemptionEnable.R The MAC layer of the UE may remove the MAC resource. R reserved resources and randomly select M from the available candidate resources in the new selection window. R New candidate resources.

[0077] Some aspects described herein relate to unlicensed RF spectrum bands that can be used for communications in a wireless network, such as wireless network 100. In some aspects, the unlicensed RF spectrum bands can be used by network nodes 110 and UEs 120 of a cellular network for cellular communications (e.g., NR communications), and / or by Wi-Fi access points and Wi-Fi stations of a Wi-Fi network for Wi-Fi communications, among other such examples. The unlicensed RF spectrum bands can be used in combination with or independently of licensed RF spectrum bands in a cellular network. In some examples, the unlicensed RF spectrum band can be a RF spectrum band that devices may need to contend for access to because the RF spectrum band can be used at least in part for unlicensed uses, such as Wi-Fi uses.

[0078] Prior to obtaining access to and communicating on an unlicensed sidelink radio frequency spectrum band, a UE may perform a listen-before-talk (LBT) procedure to contend for access to the unlicensed sidelink radio frequency spectrum band. The LBT procedure (sometimes referred to as a clear channel assessment (CCA) procedure) may include performing a CCA to determine whether a channel of the unlicensed sidelink radio frequency spectrum band is available. When it is determined that a channel of the unlicensed sidelink radio frequency spectrum band is not available (for example, because another device is already using the channel of the unlicensed sidelink radio frequency spectrum band), a CCA procedure may be performed again on the channel at a later time. In an environment where the UE may lack access to a channel of the unlicensed sidelink radio frequency spectrum band due to Wi-Fi activity, an extended CCA procedure may be employed to increase the likelihood that the UE will successfully contend for access to a channel of the unlicensed sidelink radio frequency spectrum band. The extended CCA procedure involves performing a random number of CCA procedures (from 1 to q) based on an extended CCA counter.

[0079] Regardless of whether a single CCA procedure is performed or multiple CCA procedures are performed, each CCA procedure may include detecting or sensing an energy level on a channel of the unlicensed side link radio frequency spectrum band and determining whether the energy level is below a threshold. When the energy level is below the threshold, the CCA procedure is successful, and contention for access to the channel of the unlicensed side link spectrum band may be successful. When the energy level exceeds the threshold, the CCA procedure is unsuccessful, and contention for access to the channel of the unlicensed side link spectrum band may be unsuccessful.

[0080] When the CCA procedure or the extended CCA procedure is successful, transmission may be performed on a channel of the unlicensed sidelink radio frequency spectrum band. When a packet error is encountered (e.g., due to a collision of transmissions by two or more transmitting devices or due to poor channel conditions), HARQ-based retransmissions may be performed. In some examples, retransmissions may be modified from the original transmission using rate adaptation (e.g., based at least in part on a CQI reported by the UE).

[0081] The LBT category may define a channel sensing duration during which a UE contending for access to a channel performs a CCA procedure. The channel sensing duration may indicate the length of time that the UE detects or senses the energy level on the channel to determine whether the energy level is less than (or equal to) a threshold. If the energy level is less than (or equal to) the threshold, the LBT / CCA procedure is successful and the UE may send communications. If the energy level is greater than (or equal to) the threshold, the CCA procedure is unsuccessful and the UE may wait for a period of time (e.g., a backoff duration) before performing the CCA procedure again.

[0082] Example LBT categories include Category 1 (Cat 1) LBT, Category 2 (Cat 2) LBT, Category 3 (Cat 3) LBT, and Category 4 (Cat 4) LBT. In Cat 1 LBT (also known as no LBT), no LBT procedure is performed before sending communications on the channel. In Cat 2 LBT, the channel sensing duration is fixed (e.g., there is no random backoff). For example, a 16 microsecond (μs) channel sensing duration is used for 16μs Cat 2 LBT, and a 25μs channel sensing duration is used for 25μs Cat 2 LBT. In Cat 3 LBT, the channel sensing duration is fixed (e.g., the contention window has a fixed size), and random backoff is used. In Cat 4 LBT, the channel sensing duration is variable (e.g., the contention window has a variable size), and random backoff is used.

[0083] In Cat 4LBT, the channel sensing duration may vary depending on whether a UE contending for access to a channel senses interference (e.g., an energy level greater than or equal to a threshold). Using the Cat 4LBT procedure, the UE may select a minimum channel sensing duration, which may be defined by a channel access priority level (CAPC) associated with the Cat 4LBT procedure being used by the UE. For example, four different CAPCs may be associated with Cat 4LBT, with the lowest CAPC value (e.g., CAPC 0) being associated with the highest priority for Cat 4LBT (e.g., the shortest contention window size and the shortest backoff duration), and the highest CAPC value (e.g., CAPC 3) being associated with the lowest priority for Cat 4LBT (e.g., the longest contention window size and the longest backoff duration). In general, higher CAPC values ​​(e.g., higher CAPC indexes) are associated with lower priorities. In Cat 4 LBT, if the UE detects interference within the minimum channel sensing duration for the CCA procedure as defined by the CAPC for the Cat 4 LBT procedure, the UE may increase the channel sensing duration for the next CCA procedure.

[0084] The unlicensed sidelink band in NR (NR-U) may specify the following channel access types. In type 1 channel access, the duration spanned by the sensing timeslots sensed as idle before transmission is random (e.g., Cat 4 LBT). In type 2 channel access, the duration spanned by the sensing timeslots sensed as idle before transmission is deterministic. In type 2A channel access, a sensing duration of 25 μs is used (Cat 2 LBT). In type 2B, a sensing duration of 16 μs is used (Cat 2 LBT). In type 2C channel access, sensing is not used (Cat 1 LBT may be applied when the gap is not greater than 16 μs). In NR-U, the network node may initiate a COT based on type 1 channel access. The UE may share the COT. In some cases, the UE may perform type 2 channel access before the expected transmission, and if the type 2 channel access is successful, the UE may transmit.

[0085] For the side link on the unlicensed band (SL-U), the device performs the LBT procedure based on the regulatory requirements for the unlicensed band. Different LBT types may be used depending on whether the transmission is within or outside the COT. For transmission outside the COT (transmission outside COT), Cat4 LBT is used, and for transmission in the COT (transmission within COT), Cat2 LBT or Cat1 LBT may be used. Since the sensing durations of different LBT types are different, the LBT pass probabilities of different LBT types are different. Generally speaking, the LBT probability of transmission within the COT may be higher than that of transmission outside the COT.

[0086] In the side link operation in the licensed band, the reserved resources for the UE may be preempted by another higher priority UE. However, for SL-U, the reserved resources may be outside the COT associated with the high priority UE. In this case, even if the reserved resources are preempted, the high priority UE may not be able to use the reserved resources due to LBT failure. On the other hand, the initially reserved resources may be within the COT of the low priority UE. However, after the preemption, the newly selected resources may be outside the COT. In this case, the transmission probability in the newly selected resources may be reduced compared to the initially reserved resources, thereby reducing the channel access reliability in the side link on the unlicensed band, reducing the efficiency of the side link communication on the unlicensed band, and causing conflicts in the side link communication on the unlicensed band.

[0087] Some aspects of the techniques and devices described herein provide COT-dependent preemption of a sidelink on an unlicensed band. In some aspects, a first UE may send a first SCI indicating a first reservation by the first UE for a sidelink resource corresponding to an unlicensed sidelink band for a first sidelink communication. The UE may receive a second SCI indicating a second reservation by a second UE for the sidelink resource for a second sidelink communication. The UE may determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE. The UE may perform a sidelink resource allocation operation based on the preemption state. Therefore, aspects of the techniques and devices described herein may increase channel access reliability in a sidelink on an unlicensed band, increase the efficiency of sidelink communications on an unlicensed band, and reduce conflicts in sidelink communications on an unlicensed band.

[0088] As indicated above, FIG. 4A to FIG. 4C Other examples can be found in the FIG. 4A to FIG. 4C The content described is different.

[0089] Figure 5 5 is a diagram illustrating an example 500 associated with preemption of sidelink resources in an unlicensed band according to the present disclosure. As shown, UE 502 and UE 504 can communicate with each other. UE 502 and UE 504 can communicate with each other via an unlicensed sidelink band. In some aspects, UE 502 and / or UE 504 can be, be similar to, include, or be included in Figure 3 The depicted UE 305-1 and / or UE 305-2 and / or Figure 1 and Figure 2 UE 120 is depicted.

[0090] As shown by reference numeral 506, UE 502 may send a first SCI 514. UE 504 may receive the first SCI 514. In some aspects, any number of other sidelink UEs may also receive the first SCI 514. The first SCI 514 may indicate a first reservation for sidelink resources 510 corresponding to the unlicensed sidelink frequency band. As shown by reference numeral 512, UE 504 may send and UE 502 may receive a second SCI 508. The second SCI 508 may indicate a second reservation for sidelink resources 510.

[0091] As shown by reference numeral 516, UE 502 may determine a preemption state corresponding to the first reservation relative to the second reservation. For example, UE 502 may determine the preemption state based on at least one COT associated with at least one of UE 502, UE 504, or an additional UE. The preemption state may indicate preemption or no preemption. That is, for example, in some aspects, the first reservation may be preempted by the second reservation (e.g., a preemption state of "preempted"), or the first reservation may not be preempted by the second reservation (e.g., a preemption state of "not preempted"). In some aspects, the first reservation may be preempted by the second reservation based on at least one preemption condition being satisfied.

[0092] In some aspects, for example, the sidelink resource 510 may not be within the at least one COT (e.g., may be outside the at least one COT), wherein the at least one COT is composed of each COT associated with the UE 502 and each COT shared by the UE 502. The priority of the first sidelink communication may have a first priority level, and the priority of the second sidelink communication may have a second priority level. The UE 502 may be configured with a sidelink preemption enabling parameter, and the at least one preemption condition may be satisfied based on the sidelink preemption enabling parameter having a first value and the second priority level being higher than the first priority level. In some aspects, the at least one preemption condition may be satisfied based on the sidelink preemption enabling parameter having a third priority level, the second priority level being higher than the first priority level, and the second priority level being higher than the third priority level.

[0093] For example, in some aspects, UE 502 may apply a rule to determine the preemption status. The rule may specify, for example, that if the reserved resources of the first UE (e.g., UE 502) are not in the COT of the first UE or in the shared COT of any other UE, then the existing preemption condition is applied. The rule may also specify that the physical layer of the first UE reports the preemption of the reserved resources to the MAC layer of the first UE if the following conditions are met: the reserved resources of the first UE are reserved by a UE with priority prio 1. RX The second UE (eg, UE504) is reserved, and the priority is prio RXOne of the following conditions is met: Condition 1: sl-PreemptionEnable is provided and equals "enabled" and prio TX >prio RX ; or condition 2: sl-PreemptionEnable is provided and is not equal to "enabled", and prio RX <prio pre And prio TX >prio RX , where prio pre It is the priority configured by sl-PreemptionEnable.

[0094] In some aspects, the side link resource 510 may be neither in the COT of the UE 502 nor in any shared COT of other UEs. If the preemption condition is met, the side link resource 510 may be preempted by a higher priority UE. For example, in some aspects, the side link resource 510 may be included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the UE 502 or a COT shared by the UE 502. If the UE 502 is configured with a side link preemption enabling parameter, the at least one preemption condition may be satisfied based on the side link preemption enabling parameter having a first value and a second priority level being higher than the first priority level. In some aspects, the at least one preemption condition may be satisfied based on the side link preemption enabling parameter having a third priority level, the second priority level being higher than the first priority level, and the second priority level being higher than the third priority level.

[0095] For example, in some aspects, UE 502 may apply a rule to determine the preemption status. The rule may specify, for example, that if the reserved resources of a first UE (e.g., UE 502) are in the COT of the first UE or in the shared COT of any other UE, then the existing preemption condition is applied. The rule may also specify that the physical layer of the first UE reports the preemption of the reserved resources to the MAC layer of the first UE if the following conditions are met: the reserved resources of the first UE are reserved by a UE with priority prio 1. RX The second UE (eg, UE 504) is reserved, and the priority prio RX One of the following conditions is met: Condition 1: sl-PreemptionEnable is provided and equals "enabled" and prio TX >prio RX , or condition 2: sl-PreemptionEnable is provided and is not equal to "enabled", and prio RX <prio pre And prio TX >prioRX , where prio pre It is the priority configured by sl-PreemptionEnable.

[0096] In some aspects, the at least one preemption condition may be satisfied based on the sidelink resource 510 being included in the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the UE 504 or a COT shared by the UE 504. In some aspects, the second SCI may include a dedicated data field indicating that the sidelink resource is in the at least one COT.

[0097] As shown by reference numeral 518, UE 502 may perform a sidelink resource allocation operation based on the preemption state. In some aspects, for example, UE 502 may perform a sidelink resource allocation operation based on the first reservation being preempted by the second reservation. In the case of preemption, the MAC layer of UE 502 may remove the reserved sidelink resource 510 and randomly select a new candidate resource from the available candidate resources within the new selection window, wherein the newly selected candidate resource is also in the COT of UE 502 or in the shared COT of another UE. If there are no available candidate resources within the COT of UE 502 or in the shared COT of another UE, UE 502 may randomly select a new candidate resource from the available candidate resources within the new selection window. For example, UE 502 may randomly select a new candidate resource outside of at least one of the COT associated with UE 502 or the COT shared by UE 502.

[0098] In some aspects, UE 502 may perform a sidelink resource allocation operation based on the first reservation not being preempted by the second reservation. For example, in some aspects, the first reservation may not be preempted by the second reservation based on the sidelink resources 510 being outside of at least one COT, wherein the at least one COT is comprised of each COT associated with UE 504 and each COT shared by UE 504. In some aspects, if the first reservation is not preempted by the second reservation, both the first sidelink communication and the second sidelink communication may be communicated using the sidelink resources 510.

[0099] In order to avoid transmission conflicts between the two communications, some aspects may provide for configuring different starting points for different communications. For example, in some aspects, different starting points may be predefined or configured for UE 502 and UE 504. In some aspects, the first side link communication may be associated with a first start time, and the second side link communication may be associated with a second start time. In some aspects, the second start time may correspond to the start of the side chain resource 510, and the first start time may correspond to an offset from the start of the side chain resource 510.

[0100] As shown by reference numeral 520, UE 504 may perform an LBT procedure. If the LBT procedure produces a successful result for UE 504 (which may be referred to as a "pass"), UE 504 may transmit during the offset, which will prevent channel access for UE 504. For example, based on a successful LBT procedure associated with UE 504, a second side link communication may correspond to a transmission time that at least partially overlaps with the offset. In some aspects, as shown by reference numeral 522, UE 502 may perform an LBT procedure, and UE 502 may transmit a partial automatic gain control (AGC) symbol in a first symbol of side link resource 510 based on the successful result of LBT. In some aspects, for example, if 25μs Cat2 LBT is selected, the offset may be any value or value subset between [9μs, 25μs], and if 16μs Cat2 LBT is selected, the offset may be any value or value subset between [9μs, 16μs].

[0101] In some aspects, the resource selection procedure may be triggered in a reference time slot, and the UE 502 may identify a set of candidate resources in a resource selection window including a window opening time and a window closing time, wherein the window opening time corresponds to a first time period after the reference time slot, and the window closing time corresponds to a second time period after the reference time slot. The second time period may have a length that is not less than a minimum value and not greater than the remaining PDB. For example, if the transmission LBT in the side link resource 510 fails for the UE 502, the resource selection procedure may be triggered again. If resource selection is triggered in time slot n", the physical layer of the UE 502 may identify the available candidate resources in the new resource selection window [n"+T1,n"+T2] and report the available candidate resources in the new selection window to the MAC layer of the UE 502, wherein T2 may be configured based on the UE specific implementation, but within the range of T2,min≤T2≤remaining PDB.

[0102] As indicated above, Figure 5 are provided as examples. Other examples can be found in relation to Figure 5 Described differently.

[0103] Figure 6 is a diagram illustrating an example process 600 performed, for example, by a first UE, in accordance with the present disclosure. Example process 600 is an example of operations in which a UE (eg, UE 502) performs preemption of sidelink resources in an unlicensed band.

[0104] like Figure 6 As shown, in some aspects, process 600 may include sending a first SCI indicating a first reservation of sidelink resources corresponding to an unlicensed sidelink frequency band (block 610). Figure 7The depicted communications manager 708 and / or transmitting component 704) can transmit a first SCI indicating a first reservation of side link resources corresponding to an unlicensed side link frequency band, as described above.

[0105] like Figure 6 As further shown, in some aspects, process 600 may include receiving a second SCI indicating a second reservation for the sidelink resources (block 620). Figure 7 The depicted communications manager 708 and / or receiving component 702) can receive a second SCI indicating a second reservation for the side link resources, as described above.

[0106] like Figure 6 As further shown in FIG. 6 , in some aspects, process 600 may include determining a preemption state corresponding to a second reservation relative to a first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE (block 630). For example, a UE (e.g., using Figure 7 The depicted communication manager 708 and / or determination component 710) may determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE, as described above.

[0107] like Figure 6 As further shown, in some aspects, process 600 may include performing sidelink resource allocation operations based on the preemption state (block 640). Figure 7 The depicted communications manager 708, receiving component 702, and / or transmitting component 704) can perform sidelink resource allocation operations based on the preemption state, as described above.

[0108] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0109] In a first aspect, performing a sidelink resource allocation operation based on a preemption state includes performing a sidelink resource allocation operation based on a first reservation being preempted by a second reservation. In a second aspect, either alone or in combination with the first aspect, based on at least one preemption condition being satisfied, the first reservation is preempted by the second reservation.

[0110] In a third aspect, either alone or in combination with the second aspect, the sidelink resource is not within the at least one COT, wherein the at least one COT is comprised of each COT associated with the first UE and each COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the sidelink preemption enabling parameter having a first value and the second priority level being higher than the first priority level. In a fourth aspect, either alone or in combination with the second aspect, the sidelink resource is outside the at least one COT, wherein the at least one COT is comprised of each COT associated with the first UE and each COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the sidelink preemption enabling parameter having a third priority level, the second priority level being higher than the first priority level, and the second priority level being higher than the third priority level.

[0111] In a fifth aspect, alone or in combination with the second aspect, a sidelink resource is included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with a first UE or a COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the sidelink preemption enabling parameter having a first value and the second priority level being higher than the first priority level. In a sixth aspect, alone or in combination with the second aspect, a sidelink resource is included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with a first UE or a COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the sidelink preemption enabling parameter having a third priority level, the second priority level being higher than the first priority level, and the second priority level being higher than the third priority level.

[0112] In a seventh aspect, alone or in combination with one or more of aspects 2 to 6, the at least one preemption condition is satisfied based on the side link resource being included in the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the second UE or a COT shared by the second UE. In an eighth aspect, alone or in combination with aspect 7, the second SCI comprises a dedicated data field indicating that the side link resource is in the at least one COT.

[0113] In a ninth aspect, alone or in combination with one or more aspects from the first to the eighth aspects, performing a sidelink resource allocation operation includes removing the sidelink resource from a first resource selection window based on the sidelink resource being preempted by a second UE, and determining a selected resource from a set of candidate resources in a second resource selection window, wherein the selected resource is included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE.

[0114] In the tenth aspect, alone or in combination with one or more aspects of the first to ninth aspects, performing a sidelink resource allocation operation includes removing a sidelink resource from a first resource selection window based on a reserved resource being preempted by a second UE, and determining a selected resource from a set of candidate resources in a second resource selection window, wherein the selected resource is outside the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE. In the eleventh aspect, alone or in combination with the second aspect, performing a sidelink resource allocation operation based on a preemption state includes performing a sidelink resource allocation operation based on the first reservation not being preempted by the second reservation. In the twelfth aspect, alone or in combination with the eleventh aspect, based on the sidelink resource being outside the at least one COT, the first reservation is not preempted by the second reservation, wherein the at least one COT consists of each COT associated with the second UE and each COT shared by the second UE.

[0115] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the first sidelink communication is associated with a first start time and the second sidelink communication is associated with a second start time. In a fourteenth aspect, alone or in combination with the thirteenth aspect, the second start time corresponds to a start of the sidelink resource, and wherein the first start time corresponds to an offset from the start of the sidelink resource. In a fifteenth aspect, alone or in combination with the fourteenth aspect, based on a successful listen-before-talk procedure associated with the second UE, the second sidelink communication corresponds to a transmit time that at least partially overlaps with the offset.

[0116] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the process 600 includes performing an LBT procedure, wherein performing a sidelink resource allocation operation includes sending a partial automatic gain control symbol in a first symbol of a sidelink resource based on a successful result of the LBT. In a seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the process 600 includes performing an LBT procedure, and performing a resource selection procedure based on an unsuccessful result of the LBT procedure.

[0117] In the eighteenth aspect, alone or in combination with the seventeenth aspect, a resource selection procedure is triggered in a reference time slot, and the method further includes: identifying a set of candidate resources in a resource selection window including a window opening time and a window closing time, wherein the window opening time corresponds to a first time period after the reference time slot and the window closing time corresponds to a second time period after the reference time slot, and wherein the second time period has a length not less than a minimum value and not greater than a remaining packet delay budget; and determining a selected resource from the set of candidate resources.

[0118] although Figure 6 An example block diagram of process 600 is shown, but in some aspects, process 600 may include Figure 6 Additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 600. Additionally or alternatively, two or more of the blocks in the process 600 may be performed in parallel.

[0119] Figure 7 is a diagram of an example apparatus 700 for wireless communication according to the present disclosure. Apparatus 700 may be a UE, or a UE may include apparatus 700. In some aspects, apparatus 700 includes a receiving component 702 and a transmitting component 704 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 700 may communicate with another apparatus 706 (such as a UE, a base station, or another wireless communication device) using receiving component 702 and transmitting component 704. As further shown, apparatus 700 may include a communication manager 708. Communication manager 708 may include a determining component 710.

[0120] In some aspects, the apparatus 700 may be configured to perform Figure 5 Additionally or alternatively, the apparatus 700 may be configured to perform one or more processes described herein, such as Figure 6 In some aspects, the apparatus 700 and / or Figure 7 One or more of the components shown may include a combination of Figure 2 Additionally or alternatively, Figure 7One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and may be executed by a controller or processor to perform the function or operation of the component.

[0121] The receiving component 702 may receive communications from the device 706, such as reference signals, control information, data communications, or combinations thereof. The receiving component 702 may provide the received communications to one or more other components of the device 700. In some aspects, the receiving component 702 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 700. In some aspects, the receiving component 702 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of the described UE.

[0122] The transmitting component 704 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 706. In some aspects, one or more other components of the device 700 may generate communications and may provide the generated communications to the transmitting component 704 for transmission to the device 706. In some aspects, the transmitting component 704 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 706. In some aspects, the transmitting component 704 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 704 can be co-located with the receive component 702 in a transceiver.

[0123] The communication manager 708 and / or the transmitting component 704 may transmit a first SCI indicating a first reservation of side link resources corresponding to the unlicensed side link frequency band. In some aspects, the communication manager 708 may include in conjunction with Figure 2 One or more antennas, modems, controllers / processors, memories, or combinations thereof of the UE described herein. In some aspects, the communication manager 708 may include the receiving component 702 and / or the sending component 704. In some aspects, the communication manager 708 may be, be similar to, or include Figure 1 and Figure 2The communication manager 140 depicted in, or included in, the communication manager. The communication manager 708 and / or the receiving component 702 may receive a second SCI indicating a second reservation for the side link resources.

[0124] The communication manager 708 and / or the determining component 710 may determine a preemption state corresponding to the second reservation relative to the first reservation based on at least one COT associated with at least one of the first UE, the second UE, or the additional UE. In some aspects, the determining component 710 may include combining Figure 2 One or more antennas, modems, controllers / processors, memories, or combinations thereof of the UE. In some aspects, the determining component 710 may include a receiving component 702 and / or a sending component 704.

[0125] The communication manager 708, the receiving component 702 and / or the sending component 704 may perform a side link resource allocation operation based at least in part on the preemption state. The communication manager 708, the receiving component 702 and / or the sending component 704 may perform an LBT procedure, wherein performing a side link resource allocation operation includes sending a partial automatic gain control symbol in a first symbol of a side link resource based on a successful result of the LBT. The communication manager 708, the receiving component 702 and / or the sending component 704 may perform an LBT procedure. The communication manager 708, the receiving component 702 and / or the sending component 704 may perform a resource selection procedure based on an unsuccessful result of the LBT procedure.

[0126] Figure 7 The number and arrangement of components shown are provided as examples. In practice, there may be Figure 7 Additional components, fewer components, different components, or components arranged in a different manner than those shown. Figure 7 Two or more components shown may be implemented in a single component, or Figure 7 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 7 The component set (one or more components) shown may be described as being executable by Figure 7 Another component shown may be a collection of components that perform one or more functions.

[0127] The following provides an overview of some aspects of the disclosure:

[0128] Aspect 1: A method for wireless communication performed by a first user equipment (UE), the method comprising: sending first sidelink control information (SCI) indicating a first reservation of sidelink resources corresponding to an unlicensed sidelink frequency band by the first UE for a first sidelink communication; receiving a second SCI indicating a second reservation of the sidelink resources by a second UE for a second sidelink communication; determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or an additional UE; and performing a sidelink resource allocation operation based on the preemption state.

[0129] Aspect 2: The method according to aspect 1, wherein performing the sidelink resource allocation operation based on the preemption status includes performing the sidelink resource allocation operation based on the first reservation being preempted by the second reservation.

[0130] Aspect 3: The method according to aspect 2, wherein the first reservation is preempted by the second reservation based on at least one preemption condition being met.

[0131] Aspect 4: A method according to Aspect 3, wherein the sidelink resources are not within the at least one COT, wherein the at least one COT is composed of each COT associated with the first UE and each COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the following items: the sidelink preemption enabling parameter has a first value, and the second priority level is higher than the first priority level.

[0132] Aspect 5: A method according to Aspect 3, wherein the sidelink resources are outside the at least one COT, wherein the at least one COT is composed of each COT associated with the first UE and each COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the following items: the sidelink preemption enabling parameter has a third priority level, the second priority level is higher than the first priority level, and the second priority level is higher than the third priority level.

[0133] Aspect 6: A method according to Aspect 3, wherein the sidelink resources are included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the following items: the sidelink preemption enabling parameter has a first value, and the second priority level is higher than the first priority level.

[0134] Aspect 7: A method according to Aspect 3, wherein the sidelink resources are included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE, wherein the priority of the first sidelink communication has a first priority level and the priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on the following items: the sidelink preemption enabling parameter has a third priority level, the second priority level is higher than the first priority level, and the second priority level is higher than the third priority level.

[0135] Aspect 8: A method according to any one of Aspects 3 to 7, wherein the at least one preemption condition is satisfied based on the side link resource being included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the second UE or a COT shared by the second UE.

[0136] Aspect 9: The method according to aspect 8, wherein the second SCI includes a dedicated data field indicating that the side link resource is in the at least one COT.

[0137] Aspect 10: A method according to any one of Aspects 2 to 9, wherein performing the sidelink resource allocation operation includes: removing the sidelink resource from a first resource selection window based on the sidelink resource being preempted by the second UE; and determining a selected resource from a set of candidate resources in a second resource selection window, wherein the selected resource is included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE.

[0138] Aspect 11: A method according to any one of Aspects 2 to 9, wherein performing the sidelink resource allocation operation includes: removing the sidelink resources from a first resource selection window based on the reserved resources being preempted by the second UE; and determining selected resources from a set of candidate resources in a second resource selection window, wherein the selected resources are outside the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE.

[0139] Aspect 12: The method according to aspect 2, wherein performing the sidelink resource allocation operation based on the preemption status includes performing the sidelink resource allocation operation based on the first reservation not being preempted by the second reservation.

[0140] Aspect 13: A method according to Aspect 12, wherein the first reservation is not preempted by the second reservation based on that the side link resources are outside the at least one COT, wherein the at least one COT consists of each COT associated with the second UE and each COT shared by the second UE.

[0141] Aspect 14: The method according to any one of aspects 1 to 13, wherein the first sidelink communication is associated with a first start time and the second sidelink communication is associated with a second start time.

[0142] Aspect 15: The method according to aspect 14, wherein the second start time corresponds to the start of the side chain resource, and wherein the first start time corresponds to an offset from the start of the side chain resource.

[0143] Aspect 16: The method of aspect 15, wherein the second sidelink communication corresponds to a transmission time that at least partially overlaps with the offset based on a successful listen-before-talk procedure associated with the second UE.

[0144] Aspect 17: According to the method described in any one of Aspects 1 to 16, the method also includes: performing a listen-before-talk (LBT) procedure, wherein performing the side link resource allocation operation includes sending a partial automatic gain control symbol in the first symbol of the side link resource based on a successful result of the LBT.

[0145] Aspect 18: The method according to any one of aspects 1 to 16, further comprising: performing a listen-before-talk (LBT) procedure; and performing a resource selection procedure based on an unsuccessful result of the LBT procedure.

[0146] Aspect 19: A method according to Aspect 18, wherein the resource selection procedure is triggered in a reference time slot, the method further comprising: identifying a set of candidate resources in a resource selection window including a window opening time and a window closing time, wherein the window opening time corresponds to a first time period after the reference time slot and the window closing time corresponds to a second time period after the reference time slot, and wherein the second time period has a length that is not less than a minimum value and not greater than a remaining packet delay budget; and determining a selected resource from the set of candidate resources.

[0147] Aspect 20: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 1 to 19.

[0148] Aspect 21: A device for wireless communication, the device comprising a memory and one or more processors coupled to the memory, the one or more processors configured to execute the method according to one or more of aspects 1 to 19.

[0149] Aspect 22: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 1 to 19.

[0150] Aspect 23: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1 to 19.

[0151] Aspect 24: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method according to one or more of aspects 1 to 19.

[0152] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the various aspects.

[0153] As used herein, the term "component" is intended to be broadly interpreted as hardware, and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other names, "software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures and / or functions, etc. As used herein, "processor" is implemented by a combination of hardware and / or hardware and software. It will be apparent that the systems and / or methods described herein can be implemented by a combination of hardware and / or hardware and software in different forms. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit various aspects. Therefore, the operation and behavior of the system and / or method are not described herein with reference to specific software codes, because it will be understood by those skilled in the art that software and hardware can be designed to implement the system and / or method at least in part based on the description herein.

[0154] As used herein, "satisfying a threshold" may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0155] Although the specific combination of features is stated in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features can be combined in a manner not specifically stated in the claims and / or not disclosed in the specification. The disclosure of various aspects includes each dependent claim combined with each other claim in the claim set. As used herein, the phrase "at least one of" the list of items refers to any combination of these items (it includes a single member). As an example, "at least one of a, b or c" is intended to cover a, b, c, a+b, a+c, b+c and a+b+c, and any combination with multiple identical elements (for example, a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c and c+c+c, or any other sorting of a, b and c).

[0156] Any element, action or instruction used herein should not be interpreted as key or necessary unless clearly stated. In addition, as used herein, the article "one" is intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more items connected to the article "said", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items, and can be used interchangeably with "one or more". If you only want to refer to a project, the phrase "only one" or similar terms will be used. In addition, as used herein, the terms "have", "have", "have" etc. are intended to be open terms, which do not limit the elements they modify (for example, "the element of having" A can also have B). In addition, the phrase "based on" is intended to mean "based at least in part", unless explicitly stated otherwise. In addition, as used herein, the term "or" is intended to be open when used in a series, and can be used interchangeably with "and / or", unless otherwise explicitly stated (for example, if used in combination with "any" or "only one").

Claims

1. A first user equipment (UE) for wireless communication, the first user equipment (UE) comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: sending first sidelink control information (SCI) indicating a first reservation by the first UE of sidelink resources corresponding to an unlicensed sidelink frequency band for a first sidelink communication; receiving a second SCI indicating a second reservation of the sidelink resources by a second UE for second sidelink communications; determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or an additional UE; as well as A sidelink resource allocation operation is performed based on the preemption status.

2. The first UE according to claim 1, wherein, in order to perform the sidelink resource allocation operation based on the preemption state, the one or more processors are configured to perform the sidelink resource allocation operation based on the first reservation being preempted by the second reservation. 3 . The first UE of claim 2 , wherein the first reservation is preempted by the second reservation based on at least one preemption condition being satisfied.

4. The first UE of claim 3, wherein the sidelink resources are not within the at least one COT, wherein the at least one COT consists of each COT associated with the first UE and each COT shared by the first UE, wherein a priority of the first sidelink communication has a first priority level and a priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on: The sidelink preemption enabling parameter has a first value, and The second priority level is higher than the first priority level.

5. The first UE of claim 3, wherein the sidelink resources are outside the at least one COT, wherein the at least one COT consists of each COT associated with the first UE and each COT shared by the first UE, wherein a priority of the first sidelink communication has a first priority level and a priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on: the sidelink preemption enabling parameter having a third priority level, The second priority level is higher than the first priority level, and The second priority level is higher than the third priority level.

6. The first UE of claim 3, wherein the sidelink resources are included in the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the first UE or a COT shared by the first UE, wherein a priority of the first sidelink communication has a first priority level and a priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on: The sidelink preemption enabling parameter has a first value, and The second priority level is higher than the first priority level.

7. The first UE of claim 3, wherein the sidelink resources are included in the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the first UE or a COT shared by the first UE, wherein a priority of the first sidelink communication has a first priority level and a priority of the second sidelink communication has a second priority level, wherein the first UE is configured with a sidelink preemption enabling parameter, and wherein the at least one preemption condition is satisfied based on: the sidelink preemption enabling parameter having a third priority level, The second priority level is higher than the first priority level, and The second priority level is higher than the third priority level.

8. The first UE according to claim 3, wherein the at least one preemption condition is satisfied based on the side link resource being included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the second UE or a COT shared by the second UE.

9. The first UE according to claim 8, wherein the second SCI includes a dedicated data field indicating that the sidelink resource is in the at least one COT.

10. The first UE of claim 2, wherein to perform the sidelink resource allocation operation, the one or more processors are configured to: removing the sidelink resource from a first resource selection window based on the sidelink resource being preempted by the second UE; and A selected resource is determined from a set of candidate resources in a second resource selection window, wherein the selected resource is included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE.

11. The first UE according to claim 2, wherein in order to perform the sidelink resource allocation operation, the one or more processors are configured to: removing the sidelink resource from a first resource selection window based on reserved resources being preempted by the second UE; and A selected resource is determined from a set of candidate resources in a second resource selection window, wherein the selected resource is outside the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the first UE or a COT shared by the first UE.

12. The first UE of claim 2, wherein in order to perform the sidelink resource allocation operation based on the preemption status, the one or more processors are configured to perform the sidelink resource allocation operation based on the first reservation not being preempted by the second reservation.

13. The first UE according to claim 12, wherein the first reservation is not preempted by the second reservation based on the side link resources being outside the at least one COT, wherein the at least one COT is composed of each COT associated with the second UE and each COT shared by the second UE.

14. The first UE of claim 1, wherein the first sidelink communication is associated with a first start time and the second sidelink communication is associated with a second start time.

15. The first UE of claim 14, wherein the second start time corresponds to a start of the sidelink resource, and wherein the first start time corresponds to an offset from the start of the sidelink resource.

16. The first UE of claim 15, wherein the second sidelink communication corresponds to a transmission time that at least partially overlaps with the offset based on a successful listen-before-talk procedure associated with the second UE.

17. A first UE according to claim 1, wherein the one or more processors are further configured to perform a listen-before-talk (LBT) procedure, and wherein in order to perform the sidelink resource allocation operation, the one or more processors are configured to send a partial automatic gain control symbol in a first symbol of the sidelink resource based on a successful result of the LBT.

18. The first UE of claim 1, wherein the one or more processors are further configured to: Implementing Listen Before Talk (LBT) procedures; and A resource selection procedure is performed based on an unsuccessful result of the LBT procedure.

19. The first UE of claim 18, wherein the resource selection procedure is triggered in a reference time slot, and wherein the one or more processors are further configured to: identifying a set of candidate resources in a resource selection window including a window open time and a window close time, wherein the window open time corresponds to a first time period after the reference time slot and the window close time corresponds to a second time period after the reference time slot, and wherein the second time period has a length that is not less than a minimum value and not greater than a remaining packet delay budget; and A selected resource is determined from the set of candidate resources.

20. A method of wireless communication performed by a first user equipment (UE), the method comprising: sending first sidelink control information (SCI) indicating a first reservation by the first UE of sidelink resources corresponding to an unlicensed sidelink frequency band for a first sidelink communication; receiving a second SCI indicating a second reservation of the sidelink resources by a second UE for a second sidelink communication; determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or an additional UE; as well as A sidelink resource allocation operation is performed based on the preemption status.

21. The method of claim 20, wherein performing the sidelink resource allocation operation based on the preemption status comprises performing the sidelink resource allocation operation based on the first reservation being preempted by the second reservation.

22. The method of claim 21, wherein the first reservation is preempted by the second reservation based on at least one preemption condition being satisfied.

23. The method of claim 22, wherein the at least one preemption condition is satisfied based on the sidelink resource being included in the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the second UE or a COT shared by the second UE.

24. The method of claim 21, wherein performing the sidelink resource allocation operation comprises: removing the sidelink resource from a first resource selection window based on the sidelink resource being preempted by the second UE; as well as A selected resource is determined from a set of candidate resources in a second resource selection window, wherein the selected resource is included in the at least one COT, wherein the at least one COT includes at least one of a COT associated with the first UE or a COT shared by the first UE.

25. The method of claim 21, wherein performing the sidelink resource allocation operation comprises: removing the sidelink resource from a first resource selection window based on reserved resources being preempted by the second UE; as well as A selected resource is determined from a set of candidate resources in a second resource selection window, wherein the selected resource is outside the at least one COT, wherein the at least one COT comprises at least one of a COT associated with the first UE or a COT shared by the first UE.

26. A method according to claim 20, wherein the first side link communication is associated with a first start time and the second side link communication is associated with a second start time, and wherein the second start time corresponds to the start of the side link resource, and wherein the first start time corresponds to an offset from the start of the side link resource.

27. An apparatus for wireless communication, the apparatus comprising: means for transmitting first sidelink control information (SCI) of a first reservation by the apparatus for sidelink resources corresponding to an unlicensed sidelink frequency band for a first sidelink communication; means for receiving a second SCI indicating a second reservation of the sidelink resources by the UE for a second sidelink communication; means for determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the apparatus, the UE, or an additional UE; and Means for performing a sidelink resource allocation operation based on the preemption status.

28. The apparatus of claim 27, wherein the means for performing the sidelink resource allocation operation based on the preemption status comprises means for performing the sidelink resource allocation operation based on the first reservation being preempted by the second reservation.

29. A non-transitory computer readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions that, when executed by one or more processors of a first user equipment (UE), cause the UE to: sending first sidelink control information (SCI) indicating a first reservation by the first UE of sidelink resources corresponding to an unlicensed sidelink frequency band for a first sidelink communication; receiving a second SCI indicating a second reservation of the sidelink resources by a second UE for second sidelink communications; determining a preemption state corresponding to the second reservation relative to the first reservation based on at least one channel occupancy time (COT) associated with at least one of the first UE, the second UE, or an additional UE; as well as A sidelink resource allocation operation is performed based on the preemption status.

30. The non-transitory computer-readable medium of claim 29, wherein the one or more instructions that cause the UE to perform the sidelink resource allocation operation based on the preemption status cause the UE to perform the sidelink resource allocation operation based on the first reservation being preempted by the second reservation.

Images