Out-of-footprint reservation of sidelink channel

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive, via sidelink communication, an indication that another UE has reserved a first channel occupancy time (COT) resource of a plurality of COT resources. The UE may reserve a second COT resource of the plurality of COT resources via one or more slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or transmit communications via the one or more slots associated with the first COT resource using an interleaving different from an interleaving associated with the first COT resource. Numerous other aspects are described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. non-provisional patent application No. 17 / 804,208, filed on May 26, 2022, entitled “SIDELINK OUT OF CHANNEL OCCUPANCY TIME RESERVATION” and assigned to the assignee of this application. The disclosure of the prior application is considered a part of this patent application and is incorporated by reference into this patent application. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for out-of-time reservation of sidelink channels. Background Art

[0004] 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).

[0005] 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, among other examples).

[0006] 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 improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) (CP-OFDM) 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 to better integrate with other open standards, as well as supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. 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

[0007] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include receiving an indication via a sidelink communication that another UE has reserved a first channel occupancy time (COT) resource in a plurality of COT resources. The method may include reserving a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or sending a communication via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0008] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include reserving a first COT resource in a plurality of COT resources during a time period outside of the COT resource. The method may include receiving, via a sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interlace different from the interlace associated with the first COT resource. The method may include performing communication using the first COT resource and based at least in part on avoiding the second COT resource or the different interlace.

[0009] Some aspects described herein relate to an apparatus for wireless communication performed by a UE. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to receive an indication that another UE has reserved a first COT resource in a plurality of COT resources via a sidelink communication. The one or more processors may be configured to reserve a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or to send a communication via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0010] Some aspects described herein relate to an apparatus for wireless communication performed by a UE. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to reserve the COT resource during a time period outside of a first COT resource in a plurality of COT resources. The one or more processors may be configured to receive, via a sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interleaving different from the interleaving associated with the first COT resource. The one or more processors may be configured to perform communication using the first COT resource and based at least in part on avoiding the second COT resource or the different interleaving.

[0011] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive an indication that another UE has reserved a first COT resource in a plurality of COT resources via a sidelink communication. The instruction set, when executed by one or more processors of the UE, may cause the UE to reserve a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or to send a communication via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0012] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to reserve the COT resource during a time period outside of a first COT resource in a plurality of COT resources. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive, via sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interlace different from the interlace associated with the first COT resource. The instruction set, when executed by one or more processors of the UE, may cause the UE to perform communication using the first COT resource and based at least in part on avoiding the second COT resource or the different interlace.

[0013] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving, via sidelink communication, an indication that another UE has reserved a first COT resource in a plurality of COT resources. The apparatus may include means for reserving a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or sending a communication via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0014] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include a component for reserving a first COT resource in a plurality of COT resources during a time period outside of the COT resource. The apparatus may include a component for receiving, via a sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interlace different from the interlace associated with the first COT resource. The apparatus may include a component for performing communication using the first COT resource and based at least in part on avoiding the second COT resource or the different interlace.

[0015] The various aspects generally include methods, apparatuses, 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 accompanying drawings and as illustrated in the accompanying descriptions.

[0016] The above has been quite extensively summarized according to the features and technical advantages of the examples of the present disclosure, so that the following specific embodiments can be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples can be easily used as the basis for modifying or designing other structures for 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 in terms of their organization and operation methods and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the drawings in the accompanying drawings is provided for the purpose of illustration and description, rather than as a definition of the limitations of the claims. 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). Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices 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 a variety of devices, components, systems, distributed arrangements, and / or end-user devices of various sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0019] 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.

[0020] Figure 3 is a diagram illustrating an example of side link communication according to the present disclosure.

[0021] Figure 4 is a diagram illustrating an example of side link communication and access link communication according to the present disclosure.

[0022] FIG. 5A to FIG. 5B is a diagram illustrating an example of channel occupancy time (COT) sharing for sidelink communications in an unlicensed spectrum according to the present disclosure.

[0023] Figure 6 is a diagram illustrating an example of listen-before-talk resource modification for sidelink communications in an unlicensed spectrum according to the present disclosure.

[0024] Figure 7 is a diagram illustrating an example associated with side link out-of-COT reservation according to the present disclosure.

[0025] Figure 8 is a diagram illustrating an example associated with a frequency division multiplexing channel access reserved outside a full-duplex COT according to the present disclosure.

[0026] Fig. 9 is a diagram illustrating an example associated with reservation side link control information signaling according to the present disclosure.

[0027] Fig.10 is a diagram illustrating an example process associated with sidelink out-of-COT reservation according to the present disclosure.

[0028] Fig.11 is a diagram illustrating an example process associated with sidelink out-of-COT reservation according to the present disclosure.

[0029] Fig.12 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0030] 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 construed as being limited to any specific structure or function presented throughout the present disclosure. Instead, these aspects are provided so that the present disclosure will be thorough and complete, and the protection scope of the present disclosure will be fully conveyed to those skilled in the art. It should be appreciated 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 present invention.

[0031] 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 may 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.

[0032] 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).

[0033] 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). As 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)).

[0034] 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 the 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.

[0035] 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 a 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).

[0036] In some aspects, the term "base station" or "network node" may refer to a clustered 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 network node 110). In some aspects, the term "base station" or "network node" may refer to multiple 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 the other. In this way, a single device may include more than one base station.

[0037] 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 can relay 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.

[0038] 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).

[0039] The network controller 130 may be coupled to or in communication with a collection 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 or wired backhaul communication link. In some aspects, the network controller 130 may be, or may include, a CU or a core network device.

[0040] UE 120 can be dispersed throughout the wireless network 100, and each UE 120 can be fixed or mobile. UE 120 can include, for example, access terminals, terminals, mobile stations, and / or subscriber units. 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 device, 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.

[0041] Some UE 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UE. MTC UE and / or eMTC UE may include, for example, a robot, a drone, a remote device, a sensor, a meter, a monitor and / or a location tag, which may communicate with a network node, another device (e.g., a remote device) or some other entity. Some UE 120 may be considered as an Internet of Things (IoT) device and / or may be implemented as a NB-IoT (narrowband IoT) device. Some UE 120 may be considered as customer premises equipment. UE 120 may be included in 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.

[0042] 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, an air interface, etc. Frequency may be referred to as a carrier, a 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.

[0043] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more side link channels (e.g., without using network node 110 as an intermediary to communicate with each other). 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.

[0044] The devices of the wireless network 100 may communicate using an electromagnetic spectrum, which 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 a "below 6 GHz" band in various documents and articles. A similar naming problem sometimes occurs with respect to FR2, which is often (interchangeably) referred to as a "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU).

[0045] 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, so 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.

[0046] Considering the above examples, unless otherwise expressly stated, it should be understood that if the term "below 6 GHz" or the like is used herein, the term can broadly refer to frequencies that can be lower than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise expressly stated, it should be understood that if the term "millimeter wave" or the like is used herein, the term can broadly refer to 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.

[0047] In some aspects, UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may receive an indication via a sidelink communication that another UE has reserved a first channel occupancy time (COT) resource in a plurality of channel occupancy time (COT) resources; and reserve a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or send a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0048] In some aspects, the communication manager 140 may reserve a first COT resource in the plurality of COT resources during a time period outside of the COT resource; receive, via a sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or that another UE has sent a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource; and perform communication using the first COT resource and based at least in part on avoiding the second COT resource or the different interlace. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0049] As indicated above, Figure 1 Other examples can be found in the Figure 1 Different than described.

[0050] 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.

[0051] At the network node 110, a transmit processor 220 may receive data intended for a UE 120 (or a set of UEs 120) from a 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 (CQIs) 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 partitioning 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-coding) 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 modulators) (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 further process (e.g., convert to analog, amplify, filter, and / or upconvert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a through 232t may transmit a set of downlink signals (eg, T downlink signals) via a corresponding set of antennas 234 (eg, T antennas) (shown as antennas 234a through 234t).

[0052] 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.

[0053] 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.

[0054] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included within one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, etc. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (within a single housing or multiple housings), sets of coplanar antenna elements, sets of non-coplanar antenna elements, and / or coupled to one or more transmit and / or receive components (such as, Figure 2 One or more antenna elements of one or more components in.

[0055] 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 the functions described herein (eg, reference Figures 7 to 12 ) or any aspect of any of the methods described herein.

[0056] 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 the operations described herein (e.g., with reference to Figures 7 to 12 ) or any aspect of any of the methods described herein.

[0057] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in the sidelink COT out-reservation may perform one or more techniques associated with the sidelink COT out-reservation, 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 Fig.10 The process of 1000 Fig.11 1100 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 that stores 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, Fig.10 The process of 1000 Fig.11 The process 1100 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.

[0058] In some aspects, a UE (e.g., UE 120) includes: means for receiving, via sidelink communication, an indication that another UE has reserved a first COT resource in a plurality of COT resources; and / or means for reserving a second COT resource in a plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or sending a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource. Means for the UE to perform operations described herein may include, for example, one or more of the following: communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0059] In some aspects, a UE (e.g., UE 120) includes: means for reserving a first COT resource in a plurality of COT resources during a time period outside of the COT resource; means for receiving, via a sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or that another UE has sent a communication via one or more time slots associated with the first COT resource using an interlace different from the interlace associated with the first COT resource; and / or means for performing communications using the first COT resource and based at least in part on avoiding the second COT resource or the different interlace. Means for the UE to perform operations described herein may include, for example, one or more of the following: communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0060] Although Figure 2 The 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.

[0061] As indicated above, Figure 2 Other examples can be found in the Figure 2 Different than described.

[0062] 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 referred to as an independent base station or a monolithic base station) or a decomposed base station. "Network entity" or "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).

[0063] An aggregated base station (e.g., an aggregated network node) may be configured to utilize a radio protocol stack 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) may be configured to utilize a protocol stack 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, a CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed across one or more other network nodes. A DU may be implemented to communicate with one or more RUs. Each of a CU, a DU, and a RU may 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.

[0064] 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.

[0065] Figure 3 is a diagram illustrating an example 300 of sidelink communications according to the present disclosure.

[0066] like Figure 3As 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).

[0067] like Figure 3 As 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 sidelink control information (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. TB 335 may include data. 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 request (SR).

[0068] 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, a quality of service (QoS) priority value, a resource reservation period, a PSSCH demodulation reference signal (DMRS) pattern, an SCI format for SCI-2, a beta offset for SCI-2, a number of PSSCH DMRS ports, and / or a modulation and coding scheme (MCS). SCI-2 may include information associated with data transmission on the PSSCH 320, such as a hybrid automatic repeat request (HARQ) process ID, a new data indicator (NDI), a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.

[0069] In some aspects, one or more sidelink channels 310 may use a resource pool. For example, a scheduling assignment (e.g., included in SCI 330) may be sent in a subchannel across time using specific resource blocks (RBs). In some aspects, data transmissions 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.

[0070] In some aspects, UE 305 may operate using a sidelink transmission mode (e.g., Mode 1) where resource selection and / or scheduling is performed by network node 110. For example, UE 305 may receive a grant for sidelink channel access and / or scheduling from network node 110 (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as a grant for configuration). In some aspects, UE 305 may operate using a transmission mode (e.g., Mode 2) where resource selection and / or scheduling is performed by UE 305 (e.g., instead of network node 110). In some aspects, UE 305 may perform resource selection and / or scheduling by sensing channel availability for transmission. For example, UE 305 may measure received signal strength indicator (RSSI) parameters associated with various side link channels (e.g., side link RSSI (S-RSSI) parameters), may measure reference signal received power (RSRP) parameters associated with various side link channels (e.g., PSSCH-RSRP parameters), and / or may measure reference signal received quality (RSRQ) parameters associated with various side link channels (e.g., PSSCH-RSRQ parameters), and may select a channel for transmission of side link communications based at least in part on the measurements.

[0071] Additionally or alternatively, 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).

[0072] In a transmission mode in which 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) 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 a modulation and coding scheme (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).

[0073] As indicated above, Figure 3 Other examples can be found in relation to Figure 3 Different from what is described.

[0074] Figure 4 is a diagram illustrating an example 400 of side link communications and access link communications according to the present disclosure.

[0075] like Figure 4 As shown, the transmitter (Tx) / receiver (Rx) UE 405 and the Rx / Tx UE 410 can communicate with each other via a side link, as described above in conjunction with Figure 3 As further shown in the figure, in some sidelink modes, the network node 110 can communicate with the Tx / Rx UE 405 via the first access link. Additionally or alternatively, in some sidelink modes, the network node 110 can communicate with the Rx / Tx UE 410 via the second access link. The Tx / Rx UE 405 and / or the Rx / Tx UE 410 can correspond to one or more UEs described elsewhere in this document, such as Figure 1 120. Thus, a direct link between UEs 120 (e.g., via a PC5 interface) may be referred to as a side link, and a direct link between network node 110 and UE 120 (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 network node 110 to UE 120) or uplink communications (from UE 120 to network node 110).

[0076] As indicated above, Figure 4 Other examples can be found in relation to Figure 4 Different from what is described.

[0077] FIG. 5A to FIG. 5B is a diagram illustrating an example 500 of COT sharing for sidelink communications in an unlicensed spectrum in accordance with various aspects of the present disclosure.

[0078] For example, in order to accommodate the growing business needs, various efforts have been made to improve the spectrum efficiency in wireless networks, and thereby increase the network capacity (e.g., via the use of higher-order modulation, advanced MIMO antenna technology and / or multi-cell coordination technology, etc.). Another potential way to increase network capacity is to expand the system bandwidth. However, the available spectrum in the lower frequency bands that has traditionally been licensed or otherwise allocated to mobile network operators has become very scarce. Accordingly, various technologies have been developed to enable the operation of cellular radio access technologies (RATs) in unlicensed or other shared spectrum. For example, licensed assisted access (LAA) uses carrier aggregation on the downlink to combine LTE in a licensed band with LTE in an unlicensed band (e.g., 2.4 and / or 5 GHz bands that have been filled by wireless local area networks (WLANs) or "Wi-Fi" devices). In other examples, enhanced LAA (eLAA) and further enhanced LAA (feLAA) technologies enable both uplink LTE operation and downlink LTE operation in unlicensed spectrum, MulteFire is an LTE-based technology that operates in standalone mode in unlicensed and shared spectrum, NR-U enables NR operation in unlicensed spectrum, etc. In general, when operating a cellular RAT (e.g., using LAA, eLAA, feLAA, MulteFire, and / or NR-U) in unlicensed spectrum, one challenge that arises is the need to ensure fair coexistence with incumbent (e.g., WLAN) systems that may operate in the unlicensed spectrum.

[0079] For example, before obtaining access to an unlicensed channel and / or transmitting on an unlicensed channel, a sender device (e.g., network node 110, UE 120, UE 305, etc.) having a packet to transmit may need to perform a listen-before-talk (LBT) procedure to contend for access to the unlicensed channel. The LBT procedure may generally include a clear channel assessment (CAA) procedure, which is performed to determine whether the unlicensed channel is available (e.g., not occupied by other senders). Specifically, the CCA procedure may include detecting an energy level on an unlicensed channel and determining whether the energy level meets (e.g., is less than or equal to) a threshold (sometimes referred to as an energy detection threshold, etc.). When the energy level meets (e.g., is not equal to or exceeds) the threshold, the CCA procedure is considered successful, and the sender device may obtain access to the unlicensed channel within a duration that may be referred to as a channel occupation time (COT), during which the sender device may perform transmission without performing additional LBT operations. When the energy level does not meet the threshold, the CCA procedure is unsuccessful and the contention for unlicensed channel access may be considered unsuccessful.

[0080] When the CCA procedure results in a determination that the unlicensed channel band is unavailable (e.g., because the energy level detected on the unlicensed channel indicates that another device is already using the channel), the CCA procedure may be performed again at a later time. In an environment where the sending device may lack access to an unlicensed channel (e.g., due to WLAN activity or transmissions by other devices), an extended CCA (eCCA) procedure may be employed to increase the likelihood that the sending device will successfully gain access to the unlicensed channel. For example, a sending device executing the eCCA procedure may perform a random number of CCA procedures (from 1 to q) based on an eCCA counter. In the event that the sending device senses that the channel has become clear and / or when the sending device senses that the channel has become clear, the sending device may initiate a random waiting period based on the eCCA counter and begin transmitting if the channel remains clear within the random waiting period.

[0081] Thus, while wireless networks may be configured to use unlicensed spectrum to achieve faster data rates, provide a more responsive user experience, offload traffic from licensed spectrum, etc., the need to ensure fair coexistence with existing systems (e.g., WLAN devices) may hinder efficient use of unlicensed spectrum. For example, even when there is no interference, the LBT procedure used to ensure that no other device is already using the channel introduces a delay before transmission can begin, which can degrade the user experience, leading to unacceptable performance for latency-sensitive or delay-sensitive applications, etc. In addition, these problems may be exacerbated when the initial CCA procedure is unsuccessful, because the sending device can only transmit on the channel after performing an additional number of CCA procedures and determining that the channel has become clear and remains clear for a random waiting period. In addition, in some cases, the COT obtained by the initiating sending device may have a longer duration than the duration necessary for the sending device to perform the desired transmission, which may lead to inefficient use of the unlicensed channel.

[0082] Therefore, in some cases, the wireless network may enable the COT obtained by the transmitting device to be shared with other nodes to improve access, efficiency, etc. to unlicensed channels. For example, in downlink-to-uplink COT sharing on an access link, the network node may obtain the COT using eCCA, and the COT may be shared with one or more UEs (e.g., UE 120, UE 305, etc.), which may then transmit uplink signals within the COT obtained by the network node 110. In this case, a UE attempting to initiate an uplink transmission within the COT shared with the network node may perform uplink transmission without having to perform an LBT procedure (e.g., a Category 1 (CAT-1) LBT procedure, also referred to as no LBT), or the UE may perform uplink transmission after performing a single CCA with a shorter LBT procedure (e.g., a CAT-2 LBT procedure when the downlink-to-uplink gap duration is between 16 μs and 25 μs and / or a CAT-1 LBT procedure when the downlink-to-uplink gap duration is less than or equal to 16 μs).

[0083] Additionally or alternatively, a wireless network may support uplink-to-downlink COT sharing from a UE to a network node on an access link. For example, a UE may perform a CAT-4 LBT procedure to initiate a COT (e.g., for a configured granted PUSCH or scheduled uplink transmission), which may be shared with a network node via group common uplink control information (GC-UCI), which indicates the starting point and duration of the remainder of the COT to be shared with the network node. For example, a UE may perform a CAT-4 LBT procedure to initiate a COT with a duration of 4 milliseconds (ms), and may use only 1 ms of the COT so that the remaining 3 ms of the COT may be shared with another device. In this case, the network node may need to obtain the remainder of the COT immediately after the UE's last transmission in an earlier (used) portion of the COT by performing CAT-1 or CAT-2 LBT sensing using a 16 μs gap or a 25 μs gap prior to the network node's transmission. In this way, a network node may send control and / or broadcast signals and / or channels targeted to any UE served by the network node, as long as the transmission includes downlink signals, channels and / or other transmissions (e.g., PDSCH, PDCCH, reference signals, etc.) intended to be received by the UE initiating the COT.

[0084] Additionally or alternatively, the wireless network may support UE-to-UE COT sharing on the sidelink. Figure 5AAs shown by reference numeral 510 in FIG. 1 , the COT obtained by the initiator UE (e.g., UE 305-1) may be shared with another UE (e.g., UE 305-2) in a frequency division multiplexing (FDM) mode by dividing the COT into a plurality of interlaces (e.g., time periods during which one or more UEs may perform transmission operations). Figure 5A As shown, the initiator UE may use one or more sidelink resources (e.g., time and frequency resources) to transmit in the first interlace after the COT has been obtained, and the responder UE may use sidelink frequency resources that do not overlap with the sidelink frequency resources used by the initiator UE to perform transmission operations in subsequent interlaces. Figure 5A As shown, FDM or interleaving-based COT sharing may introduce short transmission gaps between each interleaving to allow other UEs to perform transmission operations in subsequent interleavings during the shared COT, and the SCI sent by the initiator UE may carry information to support interleaving-based COT sharing. For example, the SCI containing COT sharing information may be regarded as a COT sharing grant from the initiator UE that is sharing the COT, and all responder UEs that are eligible to share the COT (e.g., based on distance metrics, group identifiers, and / or other information) may use the SCI as a COT sharing grant. In this case, the responder UE may perform a CAT-1 or CAT-2 LBT procedure before transmission at any time until the end of the COT, and the transmission gap restriction may not apply (e.g., a UE sharing a COT may start transmission anywhere within the shared COT area, even if there is a gap greater than 25 μs between the transmission and the end of the last transmission of the COT initiator UE).

[0085] Additionally or alternatively, UE-to-UE COT sharing may be enabled in a time division multiplexing (TDM) mode, as indicated by reference numeral 520. In this case, the total COT may be divided into an initial time period during which the initiator UE may perform transmissions (which may include one or more SCI transmissions including a COT sharing signal to indicate when the initial transmission will end), the remaining duration of the COT available for sharing, etc. Thus, one or more responder UEs may monitor SCIs transmitted by other UEs (e.g., initiator UEs) to recover COT sharing information that may be used to perform transmissions during the time period corresponding to the shared COT.

[0086] Thus, as described above, UE-to-UE COT sharing can achieve better access to unlicensed spectrum, more efficient use of unlicensed spectrum, etc. by enabling multiple UEs to perform transmissions during the COT obtained by an initiator UE (e.g., a UE that successfully performs the CAT-4 LBT procedure to obtain access to an unlicensed channel). Figure 5AThe FDM and / or TDM schemes shown to achieve UE-to-UE COT sharing may be associated with inefficient resource usage. Figure 5A In the FDM and TDM schemes shown, the UE initiating the COT typically completes transmission at the beginning of the COT and then shares the remaining (unused) portion of the COT with other UEs. As a result, there may be inefficient use of frequency resources in the earlier (used) portion of the COT. For example, the UE initiating the COT may occupy only one or two subchannels and / or interlaces in the used portion of the COT, which means that other UEs may potentially use subchannels and / or interlaces not occupied by the COT initiator UE to simultaneously transmit in the used portion of the COT (e.g., because the sidelink UE is not expected to perform unicast transmissions to multiple UEs simultaneously and therefore does not need to utilize all available frequency resources).

[0087] Thus, some aspects described herein may enable UE-to-UE COT sharing during the used portion of the shared COT (e.g., when the initiating UE is still transmitting). Figure 5B As shown by reference numeral 530 in the figure, UE-to-UE COT sharing when a COT initiator UE is transmitting may be achieved by dividing the UE-initiated COT into an FDM region in which the COT initiator UE reserves a set of time and frequency resources (reserved for the transmission of the COT initiator UE) and a TDM region in which other UEs sharing the COT may transmit. In this case, as shown by reference numeral 532, the SCI may include a COT sharing signal (e.g., COT system information (COT-SI)) indicating the shareable resources in the time domain and the frequency domain. For example, in Figure 5B , the shaded rectangles may indicate sharable resources that other UEs may use to transmit without conflicting with non-sharable resources reserved for transmission by the COT initiator UE.

[0088] Although this approach can improve resource utilization within a shared COT by allowing other UEs to join and transmit on unlicensed channels concurrently with the COT initiator UE, COT sharing signals can be associated with large overhead in cases where the sharable resources are disjoint and vary across the COT. For example, the UE initiating the COT can select different subchannels for transmission in different time slots or symbols within the COT in order to obtain frequency diversity. In addition, the UE can use the old sidelink resource selection algorithm to randomly select subchannels and / or time slots within the resource selection window, which generally makes the sharable resources highly disjoint. Therefore, as shown in reference numeral 534, in cases where the sharable resources are disjoint across the shared COT, the COT sharing signal can have a large overhead (e.g., because the COT sharing signal needs to indicate a rectangle corresponding to each sharable resource set in the time domain and the frequency domain and needs to further indicate a TDM region that appears after the COT initiator UE has completed transmission). The potential large overhead of the COT sharing signal is particularly problematic in a sidelink configuration, where the COT sharing signal can be carried in SCI-1 to achieve a shortened processing timeline and power savings. For example, SCI-1 is carried on PSCCH and has a small payload size to enable decoding by all UEs, and therefore may not accommodate COT shared signals with large payloads. In addition, SCI-2 carried on PSSCH may not be suitable for carrying COT shared signals because SCI-2 is not decoded by all UEs, and / or some UEs may lack the ability to support SCI-2.

[0089] Some aspects described herein relate to techniques and apparatus for implementing LBT-based resource modification and reduced COT sharing signaling for sidelink communications in unlicensed spectrum. For example, as described herein, a UE having one or more packets to send may initially perform random resource selection within a resource selection window, because the UE may not be able to determine whether the selected resource will be within a COT initiated by the UE or piggybacked on a shared COT initiated by a different UE before a successful LBT procedure. In some aspects, the UE may attempt an LBT procedure (e.g., a CAT-4 LBT procedure), and may rearrange or otherwise adjust the initially selected resources to be contiguous in the time domain and / or aggregated in the frequency domain based on the success of the LBT procedure. In this way, the UE may send an SCI including a COT sharing signal to prevent other UEs from performing interfering transmissions in a used COT area with contiguous and / or aggregated transmissions, and adjusting the reserved resources to be contiguous in the time domain and / or aggregated in the frequency domain may achieve reduced overhead for signaling the shared resources. For example, a UE initiating a COT may send an SCI indicating non-shareable resources (e.g., time and frequency resources reserved for an initial transmission of the UE), and a responding UE may select resources other than the non-shareable resources for transmission in a used portion of a shared COT. Additionally or alternatively, a UE may select non-shareable resources based on a frequency hopping pattern, and the SCI indicating non-shareable resources may include information to enable a responding device to derive the frequency hopping pattern used by the COT initiator UE (and therefore derive resources to be excluded when selecting resources in a used area of ​​a shared COT).

[0090] As indicated above, FIG. 5A to FIG. 5B Other examples can be found in the FIG. 5A to FIG. 5B Different than described.

[0091] Figure 6 is a diagram illustrating an example 600 associated with LBT-based resource modification for sidelink communications in an unlicensed spectrum in accordance with various aspects of the present disclosure.

[0092] For example, as shown by reference numeral 610, the UE may 1 triggers the side link resource selection, where nT 1 is the time of arrival of one or more packets corresponding to one or more initial transmission blocks, and T 1 is the duration between the time when the one or more packets arrive at the UE and the time when the first packet will be sent. In some aspects, when the one or more packets arrive at the UE, the UE may determine whether there is a shared COT available (e.g., the duration T after the time when the one or more packets arrive at the UE). 2In a situation where the UE determines that another shared COT is available, the UE may send the one or more packets in the shared COT (e.g., by performing type 0 random resource selection in a valid resource selection window defined for a remaining COT shared by the other UE based at least in part on a COT sharing signal sent by the other UE that initiated the shared COT).

[0093] Alternatively, in a situation where the UE determines that a shared COT is not available, the UE may perform a random resource selection in the estimated used COT area. Figure 6 As shown, the UE may determine an expected CAT-4 LBT completion timeline 612 (e.g., an expected duration for performing successful CAT-4 LBT procedures required to initiate COT), and may further determine a resource selection window covering a time period associated with packets to be sent by the UE. Figure 6 , five (5) packets numbered 1-5 may arrive at the UE, and the time period in which these 5 packets are to be transmitted may define the resource selection window. However, since the UE may be required to perform a successful CAT-4 LBT procedure before transmitting, the effective resource selection window 614 may cover a reduced portion of the total resource selection window that takes into account the expected CAT-4 LBT completion timeline 612. For example, the UE may perform type 1 random resource selection in the effective resource selection window 614, which generally corresponds to the expected used COT sharing area 620 (e.g., the COT area used for the transmission of the initiator UE and shared with other UEs). In this case, the portion of the expected COT that appears after the transmission scheduled for the UE (e.g., after the expected used COT sharing area 620) may be the remaining COT area 622, which other UEs may join by performing a successful CAT-1 or Category 2 LBT procedure.

[0094] Therefore, if Figure 6 As shown, the UE may perform random resource selection within a valid resource selection window 614 corresponding to the estimated used COT sharing area 620. For example, in time slot nT 1, the UE may perform random resource selection for three packets that are within the effective resource selection window 614 corresponding to the expected used COT sharing area 620. Therefore, resources for the first two packets (numbers 1 and 2) are excluded from the random resource selection because the first two packets are within the expected contention window countdown dead zone (e.g., occur during the expected CAT-4 LBT completion timeline). For example, resource selection is performed at the medium access control (MAC) layer and the LBT procedure is performed at the physical (PHY) layer, which may result in uncertainty about when the effective resource selection window 614 will begin. For example, the MAC layer may select the contention window based on the priority class associated with the service to be sent, and the PHY layer may select the countdown value for performing the LBT procedure based on the value of the contention window indicated by the MAC layer. Therefore, the MAC layer may not be able to determine the countdown value used by the PHY layer, and the MAC layer may perform an initial random resource selection within the effective resource selection window 614 based on the maximum duration for the expected CAT-4 LBT completion timeline 612.

[0095] Thus, in a situation where a UE attempts and performs a successful CAT-4 LBT procedure to initiate a COT, the UE may generally begin transmitting on one or more subchannels in the used COT shared region 620. In such a situation, the UE's transmission may prevent other nearby UEs from performing a successful CAT-4 LBT procedure on every subchannel occupied by the UE. As described above, this may result in inefficient use of frequency resources and / or may result in COT sharing signaling having a large overhead. For example, random resource selection at an initial stage (e.g., before the UE performs a successful CAT-4 LBT procedure to initiate a COT) may be useful for reducing the probability that the UE-selected resources will conflict with non-shareable resources in a COT initiated by another UE, for example because the UE initially has no way of knowing whether the randomly selected resources will be within the COT initiated by the UE or will be piggybacked in an FDM mode in a used COT region shared with another initiator UE. However, if another shared COT is not available and the UE is able to perform a successful CAT-4 LBT procedure, the UE does not have to comply with the resources that may be reserved by other UEs and may select any suitable resource in the COT that has been initiated by the UE. In other words, the random resource selection algorithm used by the UE to perform the initial resource selection is generally designed to avoid conflicts in the licensed spectrum, but avoiding such conflicts is unnecessary in the unlicensed spectrum because the CAT-4 LBT procedure ensures that no other device is transmitting on the unlicensed subchannel.

[0096] Thus, as indicated by reference numeral 630, the UE may trigger an adjustment of the selected resource within the valid resource selection window 614 based at least in part on a successful CAT-4 LBT procedure. In some aspects, the UE may trigger an adjustment of the selected resource within the valid resource selection window 614 based at least in part on a determination that the attempted CAT-4 LBT procedure was successful and was at least nT prior to the preselected resource (e.g., the resource selected at time slot n). 3 The LBT that occurs is successfully confirmed to trigger the adjustment, where T 3 is the minimum duration before transmission when resource reselection or modification at the PHY layer is possible. In this case, Figure 6 As shown, the preselected resources are adjusted to be contiguous in the time domain and may be further adjusted to occupy a minimum number of subchannels. For example, one or more preselected resources that appear later in the effective resource selection window 614 may be moved to an earlier time resource (e.g., an earlier symbol or time slot) to close the transmission gap, and the subchannels associated with the preselected resources that appear later in the effective resource selection window 614 may be aligned with the subchannels associated with the first resource in the effective resource selection window 614. For example, Figure 6 As shown, resource 4 is aligned with the subchannel selected for resource 1, and resource 5 is moved to the previous time slot to close the transmission gap and also align with the subchannel selected for resource 1. Additionally or alternatively, in a situation where a particular subchannel is occupied in a given time slot, another resource in the same time slot may be moved to an adjacent subchannel so that the resource occupies a minimum number of subchannels. Furthermore, in some aspects, the selected resources may be adjusted so that a 16 μs gap is provided between consecutive transmissions to allow other UEs performing CAT-2 LBT procedures to transmit in the used COT sharing area 620. Therefore, since resources 4 and 5 are aligned in the time domain and / or frequency domain, if the CAT-4 LBT procedure precedes the time resources associated with resources 4 and 5 by at least T 3 If successful, adjustments can be triggered.

[0097] In some aspects, the adjustment of resource selection can be associated with one or more initial transport block transmissions, and any resources previously reserved for retransmissions of the UE initiating the COT can be maintained. For example, resources previously reserved for retransmissions of the initiating UE can be indicated in SCI-1 that other UEs may be in the process of decoding. Therefore, other UEs joining the COT can comply with the resource reservation for retransmissions, even if the reserved resources are in a sharable resource area, as described in more detail below. In this case, in the case where one or more resources reserved for retransmissions are in the same subchannel occupied by the first pre-scheduled resource within the used COT shared area 620, the first pre-scheduled resource can be adjusted to occupy the same time slot as the resource reserved for retransmission in the next available subchannel adjacent to the subchannel reserved for retransmission. In this way, the adjustment of resource selection ensures contiguous transmissions within the used COT shared area 620, because retransmissions on reserved resources may or may not occur (e.g., depending on HARQ feedback to the initial transmission).

[0098] In some aspects, as described above, the CAT-4 LBT procedure may be performed at the PHY layer, which may trigger the MAC layer to perform resource modification to adjust the pre-selected resources to be contiguous in the time domain and / or frequency domain when the CAT-4 LBT procedure succeeds. For example, when the resources are pre-selected, the pre-selected resources are unconfirmed (e.g., because the CAT-4 LBT procedure may have failed) and are not indicated as reserved resources in the SCI sent over the air to other UEs. Therefore, resource reselection or modification may be based at least in part on the resources adjusted in the time domain and / or frequency domain at least T before. 3 The successful CAT-4 LBT procedure is triggered at the MAC layer, where T 3is the minimum duration for processing resource adjustments. In addition, in some aspects, the MAC layer may adjust the first resource (e.g., a reference resource defining a subchannel to which the resource is later moved) if the duration between the trigger indicating the success of CAT-4 LBT and the start of the first resource meets (e.g., is equal to or exceeds) a threshold. For example, as described above, the expected CAT-4 LBT completion timeline 612 may be based on a worst-case scenario (e.g., the PHY layer selects a maximum countdown value), whereby the CAT-4 LBT procedure may succeed earlier than the expected CAT-4 LBT completion timeline 612 determined by the MAC layer. For example, when the MAC layer signals the PHY layer a contention window value, the PHY layer selects a random number q between zero and the contention window value, and the MAC layer determines the expected CAT-4 LBT completion timeline 612 based on the maximum value of q (e.g., the contention window value). When q counts down to zero, the PHY layer attempts the CAT-4 LBT procedure and may trigger the MAC layer to perform resource modification if the CAT-4 LBT procedure is successful. Therefore, if the duration between the trigger indicating CAT-4 LBT success received at the MAC layer and the first (reference) resource in the valid resource selection window 614 satisfies a threshold (e.g., equals or exceeds T 3 ), the MAC layer may move the first resource to an earlier time slot and the later resources in the valid resource selection window 614 may be adjusted accordingly (e.g., moved to an earlier time slot so as to be contiguous with the first resource in at least the time domain).

[0099] In some cases, the COT outer reservation may allow the first UE to reserve future COT resources for retransmission or for a new transport block. The second UE (and / or other UEs) may be configured to utilize (e.g., use) the reserved COT resources with a later start position using TDM. Using TDM, different side link transmitters may compete for COT between them and with other RAT technologies such as Wi-Fi, and may eventually need to clear LBT for different time slots before transmitting. Using this reservation framework, if different side link transmitters perform FDM in different interlaces and start COT at the same time using coordinated channel access, it may be possible to better utilize the reserved COT resources. For example, the contention for LBT between side link nodes and the number of required LBT procedures may be reduced, which may help improve channel access. However, using FDM to perform COT outer reservations on UEs may cause broadband CAT-4 LBT procedures to not clear the same time slots even when the LBT procedures start at the same time. For example, different FDM transmitters may select different random backoff numbers for CAT-4 LBT and may not count down before the same time slot or micro-time slot. Additionally or alternatively, if one FDM transmitter UE ends countdown at time slot or mini-slot i and starts transmitting at time slot or mini-slot i+1, the FDM transmitter UE may block other FDM transmitter UEs that have not completed (or cannot complete) countdown at time slot or mini-slot i.

[0100] Techniques and apparatus for sidelink out-of-COT reservation are described herein. In some aspects, a UE may receive an indication via a sidelink communication that another UE has reserved a first COT resource from a plurality of COT resources. The UE may reserve a second COT resource from the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access. Additionally or alternatively, the UE may send communications via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0101] In some aspects, UE-to-UE (e.g., sidelink) COT sharing procedures involving a COT sharing UE not transmitting to a COT initiating UE may enhance resource sharing between sidelink and asynchronous Wi-Fi slot-based channel access. In some aspects, coordinated FDM channel access may allow multiple transmitter UEs to utilize synchronous CAT-4 LBT access resources and transmit to multiple corresponding receiver UEs.

[0102] In some aspects, the first UE may use frequency domain resource assignment (FDRA) and LBT parameters to reserve future COT resources for retransmission or for future transport blocks. Other UEs may join the first UE using coordinated FDM access (e.g., CAT-4 LBT) on the reserved COT resources. In some aspects, some or all of the side link nodes (e.g., UEs) may be able to reserve future COT resources. The later reserved node may need to align the FDRA parameters and LBT parameters based at least in part on determining to join the coordinated channel access on the overlapping COT resources reserved by the earlier node. For example, the later reserved node may need to avoid the interleaving selected earlier, and may need to align the counter value, postponement duration, starting position, etc.

[0103] In some aspects, the frequency-only reservation outside the COT may include an FDRA (e.g., an FDRA and a set of RBs) and a time domain resource assignment (TDRA). In some aspects, the reserved UE may reserve a gap for CAT-4 LBT, and the end of the LBT window may indicate a location where the joining node may need to clear the LBT and perform a transmission. Otherwise, the joining node may need to avoid transmitting within the reserved COT duration. In some aspects, the beginning of the LBT window may specify a location where the joining node will start LBT using specified LBT parameters. In some aspects, the LBT parameter reservation may indicate one or more of a starting position, a backoff counter value, and / or a postponement duration, etc.

[0104] In some aspects, the distributed mechanisms described herein may enable multiple nodes to have synchronized CAT-4 LBT and FDM in different interlaces. Thus, nodes may reuse the same COT resources more efficiently, which may reduce the number of LBT procedures required and / or may improve performance in the presence of asynchronous access (e.g., from Wi-Fi). In some aspects, if two sidelink nodes want to synchronize on CAT-4 LBT and FDM in different interlaces without coordination from a higher node (e.g., a base station), a Mode 2 reservation mechanism may be used to coordinate LBT and FDRA between multiple nodes.

[0105] As indicated above, Figure 6 Other examples can be found in the Figure 6 Different than described.

[0106] Figure 7700 is a diagram illustrating an example of sidelink COT out-reservation according to the present disclosure. A first UE 705 may communicate with a second UE 710. The first UE 705 and / or the second UE 710 may include some or all of the features of the UE 120 described herein. In some examples, the first UE 705 may include multiple first UEs 705, and the second UE 710 may include multiple second UEs 710. For example, one or more functions described as being performed by the second UE 710 may be performed by multiple UEs (such as UE 710-1 and UE 710-2).

[0107] As shown in conjunction with reference numeral 715, the first UE 705 may send and the second UE 710 may receive an indication that the first UE 705 has reserved a first COT resource in a plurality of COT resources. In some aspects, the first UE 705 may reserve the first COT resource (including FDRA parameters and LBT parameters, etc.) for retransmission or for future transmission block transmission. As described in detail below, a late UE (e.g., the second UE 710) may join the first UE 705 using coordinated FDM channel access.

[0108] As shown in conjunction with reference numeral 720, the second UE 710 may reserve a second COT resource among the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access. Additionally or alternatively, the second UE 710 (or another UE) may send communications via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0109] In some aspects, the second UE 710 may join the first UE 705 using coordinated FDM channel access. For coordinated FDM channel access using CAT-4 LBT in the reserved COT resources, a late transmitter UE (e.g., the second UE 710) may need to align the LBT starting point, postponement duration, and / or backup counter, and may need to avoid the reserved interleaving. Additionally or alternatively, the late transmitter UE may need to align the transmission slot with the starting position of the cyclic prefix extension (CPE). In some aspects, the second UE 710 may decode the previous FDRA SCI, and may reserve one or more COT resources including the LBT window and the FDRA. In some examples, the LBT window may overlap with the previous reservation. In other examples, the LBT window may not overlap with the previous reservation.

[0110] In some aspects, if the second UE 710 will perform coordinated FDM access with the first UE 705, the second UE 710 may need to select aligned LBT windows and parameters and FDRA for future reserved COT time slots. If the second UE 710 will not perform coordinated FDM access with the first UE 705, the second UE 710 may select different LBT windows and parameters and / or different FDRAs. In some aspects, the second UE 710 may align the counter value, postponement duration, starting position (e.g., LBT parameters), and / or LBT window for coordination of CAT-4 LBT. Additionally or alternatively, the second UE 710 may only align the LBT window. In this case, the beginning of the LBT window may indicate the position where the joining node can start to perform LBT, and the end of the LBT window may indicate the position where the joining node will complete LBT and start to send, or the position where LBT will stop and will not send for the reserved COT. In some aspects, the second UE 710 may choose to reserve FDRA to avoid the previously selected interleaving. In some aspects, the second UE 710 may compare the SCI RSRP to the SCI RSRP threshold. The second UE 710 may align the LBT parameters and the window and the FDRA based at least in part on the SCI RSRP satisfying the SCI RSRP threshold. Alternatively, the second UE 710 may not align the LBT parameters and the window and the FDRA based at least in part on the SCI RSRP not satisfying the SCI RSRP threshold.

[0111] In some aspects, the second UE 710 may maintain a hop counter. The second UE 710 may include the hop counter and the original transmitter identifier (e.g., an identifier associated with the first UE 705) in the reserved SCI. The second UE 710 may join the same group for coordinated access based at least in part on the reserved SCI having a hop counter that is less than or less than or equal to a hop counter threshold. If the second UE 710 determines to join the group for coordinated access, the second UE 710 may need to comply with the FDRA reservation from a previously reserved node within the same group, such as a previous reservation made by the first UE 705.

[0112] In some aspects, a hop counter may track the number of hops through which a reserved SCI for coordinated FDM access propagates. An initiator transmitter identifier (e.g., an identifier associated with the first UE 705) may help identify the group for coordinated access. In some aspects, setting a hop counter threshold may allow for limiting the scope of coordinated access. For example, the second UE 710 may join the group for coordinated access only based at least in part on the reserved SCI having a hop counter value less than or less than or equal to the hop counter threshold. In some aspects, if the second UE 710 determines to join the same group for coordinated access, the FDRA reservation from the reserved SCI having a hop counter value greater than or greater than or equal to the hop counter threshold may still be valid. For example, if the network has a common hop counter threshold, one or more bits in the reserved SCI may be saved by removing the LBT parameter. In this case, an indication of the transmitter identifier, FDRA, and LBT window may be sufficient.

[0113] In some aspects, the second UE 710 may send a reserved SCI indicating LBT parameters, LBT windows, reserved interleaving and / or COT resource slots. The time domain reservation may reserve multiple adjacent COT slots and LBT windows. In some aspects, the time domain reservation may indicate an offset from the reserved SCI and / or the duration of future COT slots. In some aspects, the LBT window may have one or more of the following example characteristics. In a first example, the end of the LBT window may specify the location where the joining node needs to complete LBT and start sending. The LBT window may indicate the CPE and the resources reserved for the joining node to perform CAT-4 LBT. In a second example, the beginning of the LBT window may indicate the location where each joining node may need to start performing CAT-4 LBT based at least in part on the LBT parameters notified by the signal, and the end of the LBT window may be the last point where each of these nodes can clear LBT and start sending. In some cases, if the countdown is earlier than the end of the LBT window, the node may be allowed to start sending.

[0114] In some aspects, the beginning of the LBT window may correspond to the beginning of the reserved COT slot. In this case, only the duration of the LBT window may need to be indicated in the reserved SCI signaling. Additionally or alternatively, the length of the LBT window may be RRC-configured. In some aspects, the frequency domain reservation may indicate the interleaving reserved in the future COT slot. The FDRA may reserve different interleaving sets for different slots in the future COT slot. In some aspects, the reserved SCI signaling may indicate the CPE starting position of the late transmitter (e.g., the second UE 710). By selecting the same starting position as the CPE, the FDM transmitters may not need to block each other based at least in part on the LBT cleared in the same slot. In some aspects, the starting position of the FDM coordination channel may be earlier than the conventional COT out-of-reservation. In some aspects, the reserved SCI signaling may include an indicator indicating whether the FDM coordination channel is allowed or not allowed. If the FDM coordination channel is not allowed, the LBT parameters may not need to be signaled because this may only be a COT out-of-reservation, except that certain interleavings may be reserved. In some aspects, in conjunction with reservation within a COT, the reserving UE may update the FDRA a few time slots after initiating the COT.

[0115] In some aspects, reserved SCI signaling may indicate random backoff counter coordination. Two nearby transmitters using interleaved FDM and under similar interference conditions may have a higher chance of clearing LBT at the same time. In some cases, two FDM transmitters may need to have the same service type and random counter value in order to clear LBT at the same time. However, in the case of broadband CAT-4 LBT, this may be difficult. As described herein, different LBT transmitters may select different random backoff numbers and postponement periods for CAT-4 LBT. Therefore, they may not count down before the same time slot or mini-slot. Additionally or alternatively, if an FDM transmitter UE ends the countdown at time slot or mini-slot i and starts transmitting at time slot or mini-slot i+1, the FDM transmitter UE may block other FDM transmitter UEs that have not completed the countdown at time slot or mini-slot i.

[0116] In some aspects, the reserved SCI may indicate a back-off counter value to be used for all subchannels or interlaces by other FDM UEs (e.g., the second UE 710). In some aspects, FDM transmitters subject to the same interference pattern may be able to simultaneously clear CAT-4 LBT and start transmitting at the same time slot or microslot without blocking each other. In some aspects, for the sidelink per-time slot reservation scheme, the back-off counter value may only apply to the time slots in TDRA. In some aspects, for reservations outside frequency COT only, the back-off counter value may apply to all time slots in a specified window.

[0117] In some aspects, the postponement duration may be affected by the channel access priority category (CAPC), and FDM UEs with different service priorities may not clear LBT at the same time. In this case, two example options for postponement duration may be possible. In a first example, a reserved transmitter (e.g., a first UE 705) may include an indication of the CAPC and / or postponement duration in the SCI, and a late UE (e.g., a second UE 710) may use the same postponement duration. For example, regardless of the service priority of the second UE 710, the second UE 710 may use the same postponement duration as the first UE 705. In a second example, the second UE 710 may select the postponement duration based at least in part on the CAPC of the second UE 710, and FDM may be opportunistic. In an example with different postponement periods, FDM UEs with different service priorities may or may not clear LBT before the same time slot.

[0118] In some aspects, the SCI may signal a backoff counter value for each priority class of another transmitter. The reserved transmitter (e.g., the first UE 705) may select different random values ​​for different CAPCs, and may signal the selected backoff counter value via the SCI. A late UE (e.g., the second UE 710) using the reserved COT resources may need to use a random counter value based at least in part on the service priority and the reserved SCI. For example, the second UE 710 may select a counter value from a list of counter values ​​signaled in the reserved SCI based at least in part on the service priority.

[0119] In some aspects, there may be multiple reserved SCIs from different transmitters. It may be desirable to synchronize LBT parameters only between nearby SL nodes because they may be affected by similar interference. For example, if two SL nodes are far apart, the interference may be different and synchronizing the counter value may not be useful. Alternatively, if two sidelink nodes are close to each other, the reserved node may be configured to perform a window update on the reserved COT resources.

[0120] In some aspects, a receiver (e.g., a second UE 710) of a reserved SCI may use LBT parameters and / or LBT windows from the strongest SCI associated with a time slot. The reserved SCI RSRP may need to meet the SCI RSRP threshold, as described above. The SCI may be a first-level SCI (SCI-1). In some aspects, the second UE 710 that starts LBT at time instance i may use the backoff value and starting position of the dominant reserved SCI associated with time instance i. If the reserved transmitter is far away, the possibility of two transmitters clearing LBT at the same time is small. In some aspects, a receiver (e.g., a second UE 710) may only comply with the reserved backoff value based at least in part on the SCI RSRP meeting the SCI RSRP threshold, or at least in part on the distance to the reserved transmitter being less than or less than or equal to the distance threshold.

[0121] As described above, using FDM to perform COT out-of-reservation on a UE may cause a broadband CAT-4 LBT procedure to not clear the same time slot even when the LBT procedure starts at the same time. Using the techniques and devices described herein, a second UE 710 may receive an indication that a first UE 705 has reserved a first COT resource among multiple COT resources via a side link communication. The second UE 710 may reserve a second COT resource among multiple COT resources via one or more time slots associated with the first COT resource and using FDM channel access. Additionally or alternatively, the second UE 710 may send communications via one or more time slots associated with the first COT resource using an interleaving different from the interleaving associated with the first COT resource. Therefore, coordinated access for out-of-COT reservations may be improved.

[0122] As indicated above, Figure 7 Other examples can be found in the Figure 7 Different than described.

[0123] Figure 88 is a diagram illustrating an example 800 of coordinated FDM channel access with full-duplex (FD) out-of-COT reservation according to the present disclosure. A first UE (UE1), a second UE (UE2), and a third UE (UE3) may reserve one or more COT resources. As shown by reference numeral 805, during UE1 COT, UE1 may reserve one or more future COT resources. For example, UE1 may reserve interlace 0. As shown by reference numeral 810, during UE2 COT, UE2 may reserve one or more future COT resources. UE2 may reserve future COT resources with aligned LBT parameters and may avoid interlace 0. For example, UE2 may reserve interlace 4. As shown by reference numeral 815, UE3 may select one or more COT resources and LBT parameters from the strongest reserved SCI and may avoid interlace 0 and interlace 4. For example, UE3 may reserve interlace 3. As shown by reference numeral 820, UE1 may perform transmission within reserved interlace 0. As shown by reference numeral 825, UE2 may perform transmission within reserved interlace 4. As indicated by reference numeral 830 , UE3 may perform transmission in reserved interlace 2 .

[0124] As indicated above, Figure 8 Other examples can be found in the Figure 8 Different than described.

[0125] Fig. 9 is a diagram illustrating an example 900 of reserved SCI signaling according to the present disclosure. A first UE (UE1) and a second UE (UE2) may reserve one or more COT resources. As shown by reference numeral 905, during UE1 COT, UE1 may reserve one or more future COT resources. For example, UE1 may reserve interlace 0. As shown by reference numeral 910, UE1 may perform transmission within interlace 0. As shown by reference numeral 915, UE2 may perform transmission that avoids interlace 0, such as transmission that occurs within interlace 4. In some aspects, the time domain reservation may indicate an offset 920 from the reserved SCI and / or the duration of a future COT time slot. As described herein, the LBT window may have one or more of the following example characteristics. In a first example, the end of the LBT window may specify the location where the joining node needs to complete the LBT and start transmitting. The LBT window may indicate the CPE and the resources reserved for the joining node to perform CAT-4 LBT. In a second example, the beginning of the LBT window may indicate where each joining node may need to begin performing CAT-4 LBT based at least in part on the signaled LBT parameters, and the end of the LBT window may be the last point at which each of these nodes can clear LBT and begin transmitting.

[0126] As indicated above, Fig. 9 Other examples can be found in the Fig. 9Different than described.

[0127] Fig.10 1 is a diagram illustrating an example process 1000 performed, for example, by a UE in accordance with the present disclosure. Example process 1000 is an example in which a UE (eg, UE 120) performs operations associated with sidelink out-of-COT reservation.

[0128] like Fig.10 As shown, in some aspects, process 1000 may include receiving, via a sidelink communication, an indication that another UE has reserved a first COT resource among a plurality of COT resources (block 1010). Fig.12 The communication manager 140 and / or receiving component 1202 depicted in the figure may receive an indication that another UE has reserved a first COT resource among multiple COT resources via a side link communication, as described above.

[0129] like Fig.10 As further shown, in some aspects, process 1000 may include reserving a second COT resource from the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or sending a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource (block 1020). Fig.12 The communication manager 140 and / or reservation component 1208 depicted in the figure may reserve a second COT resource among the multiple COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or send communications via one or more time slots associated with the first COT resource using an interleave different from the interleave associated with the first COT resource, as described above.

[0130] Process 1000 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.

[0131] In a first aspect, reserving the second COT resource includes reserving the second COT resource during a time period outside of the second COT resource.

[0132] In a second aspect, alone or in combination with the first aspect, reserving the second COT resource includes aligning a listen-before-talk starting point, a deferral duration, and a backup counter to avoid the first COT resource.

[0133] In a third aspect, alone or in combination with one or more of the first and second aspects, reserving the second COT resource comprises aligning a transmission time slot with a starting position of a cyclic prefix extension to avoid the first COT resource.

[0134] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 1000 includes selecting an LBT window, LBT parameters, and FDRA parameters before reserving a second COT resource or sending communications via a different interlace.

[0135] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, selecting an LBT window, LBT parameters, and FDRA parameters comprises aligning a counter value, a deferral duration, and a starting position associated with the LBT procedure.

[0136] In a sixth aspect, either alone or in combination with one or more of aspects 1 to 5, selecting the LBT window, LBT parameters, and FDRA parameters includes selecting the LBT window, LBT parameters, and FDRA parameters based at least in part on an SCI reference signal received power (RSRP) measurement satisfying an SCI RSRP threshold.

[0137] In a seventh aspect, alone or in combination with one or more of aspects 1 to 6, process 1000 includes sending an SCI including an indication of a hop counter and an identifier associated with other UEs, wherein reserving a second COT resource or sending communications via a different interlace includes reserving a second COT resource or sending communications via a different interlace based at least in part on a value of the hop counter failing to satisfy a hop counter threshold.

[0138] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, reserving the second COT resources also includes avoiding the first COT resources and one or more other COT resources reserved by the UE group for coordinated channel access, wherein the UE group for coordinated channel access includes other UEs.

[0139] In a ninth aspect, either alone or in combination with one or more of aspects one to eight, reserving a second COT resource further comprises reserving the second COT resource based at least in part on a hop counter value being greater than or greater than or equal to a hop counter threshold, and based at least in part on the UE being included in a UE group for coordinated channel access.

[0140] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 1000 includes sending or receiving an SCI including an indication of LBT parameters, an LBT window, interleaving, and a second COT resource.

[0141] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, a time domain resource reservation associated with the SCI indicates a plurality of contiguous COT resources and LBT windows.

[0142] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the end of the LBT window indicates a location where the UE and other UEs will complete the LBT procedure and initiate one or more transmissions using multiple COT resources.

[0143] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the beginning of the LBT window indicates the location where the UE and other UEs will begin to perform LBT procedures based at least in part on LBT parameters, and the end of the LBT window indicates the last location where the UE and other UEs will complete the LBT procedures and initiate one or more transmissions using multiple COT resources.

[0144] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the frequency domain resource reservation associated with the SCI indicates one or more reserved interlaces in the second COT resources.

[0145] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the SCI further includes an indication of a cyclic prefix extension start position or an indication of whether frequency division multiplexing coordinated channels are allowed.

[0146] In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, process 1000 includes sending or receiving an SCI indicating a backoff counter value to be used by other UEs for all interlaces associated with a plurality of COT resources.

[0147] In a seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the SCI comprises a channel access priority class parameter or an indication of a deferral duration.

[0148] In an eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, process 1000 comprises selecting a deferral duration based at least in part on a channel access priority class associated with the UE.

[0149] In a nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, process 1000 includes sending or receiving an SCI indicating one or more signal backoff counter values ​​for each priority class.

[0150] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, process 1000 includes selecting a second COT resource using LBT parameters or an LBT window indicated in an SCI associated with a plurality of COT resources and based at least in part on an SCI RSRP being greater than or greater than or equal to an SCI RSRP threshold.

[0151] although Fig.10 An example block diagram of process 1000 is shown, but in some aspects, process 1000 may include Fig.10 Additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1000. Additionally or alternatively, two or more of the blocks in the process 1000 may be performed in parallel.

[0152] Fig.11 1 is a diagram illustrating an example process 1100 performed, for example, by a UE according to the present disclosure. Example process 1100 is an example in which a UE (eg, UE 120) performs operations associated with sidelink out-of-COT reservation.

[0153] like Fig.11 As shown, in some aspects, process 1100 may include reserving a first COT resource among a plurality of COT resources during a time period outside of the first COT resource (block 1110). Fig.12 The communication manager 140 and / or the reservation component 1208 depicted in FIG. 1 may reserve a first COT resource among the plurality of COT resources during a time period outside of the first COT resource, as described above.

[0154] like Fig.11 As further shown, in some aspects, process 1100 may include receiving, via a sidelink communication, an indication that another UE has transmitted a communication via one or more time slots associated with the first COT resource and using an FDM channel to access a second COT resource of the plurality of COT resources reserved, or that the other UE has transmitted a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource (block 1120). Fig.12 The communication manager 140 and / or receiving component 1202 depicted in the figure may receive via side link communication an indication that another UE has sent a communication via one or more time slots associated with the first COT resource and using an FDM channel to access a second COT resource among the reserved multiple COT resources, or that the other UE has sent a communication via one or more time slots associated with the first COT resource using an interleaving different from the interleaving associated with the first COT resource, as described above.

[0155] like Fig.11 As further shown, in some aspects, process 1100 may include performing communications using a first COT resource and based at least in part on avoiding a second COT resource or a different interlace (block 1130). Fig.12The communication manager 140, receiving component 1202, and / or sending component 1204 depicted in FIG. 1 may perform communications using a first COT resource and based at least in part on avoiding a second COT resource or a different interlace, as described above.

[0156] Process 1100 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.

[0157] In a first aspect, reserving a first COT resource includes sending an indication of an LBT window, LBT parameters, and FDRA parameters associated with the first COT resource.

[0158] In a second aspect, alone or in combination with the first aspect, receiving an indication that other UEs have reserved the second COT resources includes receiving an indication of an LBT window, LBT parameters, and FDRA parameters associated with the second COT resources.

[0159] In a third aspect, alone or in combination with one or more of the first and second aspects, process 1100 includes sending or receiving an SCI including an indication of LBT parameters, an LBT window, interleaving, and a second COT resource.

[0160] In a fourth aspect, alone or in combination with one or more of the first to third aspects, a time domain resource reservation associated with the SCI indicates a plurality of contiguous COT resources and LBT windows.

[0161] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the end of the LBT window indicates a location where the UE and other UEs will complete the LBT procedure and initiate one or more transmissions using multiple COT resources.

[0162] In a sixth aspect, alone or in combination with one or more of aspects one to five, the beginning of the LBT window indicates the location where the UE and other UEs will begin to perform LBT procedures based at least in part on LBT parameters, and the end of the LBT window indicates the last location where the UE and other UEs will complete the LBT procedures and initiate one or more transmissions using multiple COT resources.

[0163] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, a frequency domain resource reservation associated with the SCI indicates one or more reserved interlaces in the COT resources.

[0164] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the SCI further includes an indication of a cyclic prefix extension start position or an indication of whether frequency division multiplexing coordinated channels are allowed.

[0165] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, process 1100 includes sending or receiving an SCI indicating a backoff counter value to be used by other UEs for all interlaces associated with a plurality of COT resources.

[0166] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the SCI includes a channel access priority class parameter or an indication of a deferral duration.

[0167] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 1100 includes selecting a deferral duration based at least in part on a channel access priority class associated with the UE.

[0168] In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, process 1100 includes sending or receiving side link control information indicating one or more signal backoff counter values ​​for each priority class.

[0169] although Fig.11 An example block diagram of process 1100 is shown, but in some aspects, process 1100 may include Fig.11 Additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1100. Additionally or alternatively, two or more blocks of the blocks of process 1100 may be performed in parallel.

[0170] Fig.12 1 is a diagram of an example apparatus 1200 for wireless communication. Apparatus 1200 may be a UE, or a UE may include apparatus 1200. In some aspects, apparatus 1200 includes a receiving component 1202 and a transmitting component 1204 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1200 may communicate with another apparatus 1206 (such as a UE, a base station, or another wireless communication device) using receiving component 1202 and transmitting component 1204. As further shown, apparatus 1200 may include a communication manager 140. Communication manager 140 may include one or more of a reservation component 1208 or a selection component 1210, among others.

[0171] In some aspects, the apparatus 1200 may be configured to perform Figures 7 to 9 Additionally or alternatively, the apparatus 1200 may be configured to perform one or more of the processes described herein, such as Fig.10 The process of 1000 Fig.11 In some aspects, the apparatus 1200 and / or Fig.12One or more of the components shown in the figure may include a combination of Figure 2 Additionally or alternatively, Fig.12 One or more of the components shown in the figure 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 an instruction or code that is stored in a non-transitory computer-readable medium and can be executed by a controller or processor to perform the function or operation of the component.

[0172] The receiving component 1202 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the device 1206. The receiving component 1202 may provide the received communications to one or more other components of the device 1200. In some aspects, the receiving component 1202 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 1200. In some aspects, the receiving component 1202 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.

[0173] The transmitting component 1204 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1206. In some aspects, one or more other components of the device 1200 may generate communications and may provide the generated communications to the transmitting component 1204 for transmission to the device 1206. In some aspects, the transmitting component 1204 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 1206. In some aspects, the transmitting component 1204 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 1204 can be co-located with the receive component 1202 in a transceiver.

[0174] The receiving component 1202 can receive, via a sidelink communication, an indication that another UE has reserved a first COT resource in the plurality of COT resources. The reserving component 1208 can reserve a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using FDM channel access, or send a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

[0175] The selection component 1210 can select the LBT window, LBT parameters, and FDRA parameters before reserving the second COT resources or sending communications via a different interlace.

[0176] The sending component 1204 may send an SCI including an indication of the hop counter and an identifier associated with the other UE, wherein reserving a second COT resource or sending the communication via a different interlace includes reserving the second COT resource or sending the communication via a different interlace based at least in part on the value of the hop counter failing to satisfy a hop counter threshold.

[0177] Transmitting component 1204 may transmit or receive an SCI including an LBT parameter, an LBT window, an interlace, and an indication of a second COT resource. Transmitting component 1204 may transmit or receive an SCI indicating a backoff counter value to be used by other UEs for all interlaces associated with multiple COT resources.

[0178] Selecting component 1210 can select the deferral duration based at least in part on a channel access priority class associated with the UE.Sending component 1204 can send or receive an SCI indicating one or more signal backoff counter values ​​for each priority class.

[0179] The selection component 1210 can select a second COT resource using an LBT parameter or LBT window indicated in an SCI associated with the plurality of COT resources and based at least in part on an SCI reference signal reserved power (RSRP) being greater than or greater than or equal to an SCI RSRP threshold.

[0180] The reservation component 1208 may reserve a first COT resource in the plurality of COT resources during a time period outside of the COT resource. The receiving component 1202 may receive, via a sidelink communication, an indication that another UE has reserved a second COT resource in the plurality of COT resources via one or more time slots associated with the first COT resource and using an FDM channel access, or that another UE has transmitted a communication via one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource. The receiving component 1202 and / or the transmitting component 1204 may perform communications using the first COT resource and based at least in part on avoiding the second COT resource or the different interlace.

[0181] The sending component 1204 can send or receive an SCI including LBT parameters, LBT window, interleaving, and an indication of a second COT resource.

[0182] The transmitting component 1204 may transmit or receive an SCI indicating a backoff counter value to be used by other UEs for all interlaces associated with the plurality of COT resources. The selecting component 1210 may select a deferral duration based at least in part on a channel access priority class associated with the UE. The transmitting component 1204 may transmit or receive sidelink control information indicating one or more signal backoff counter values ​​for each priority class.

[0183] Fig.12 The number and arrangement of components shown in the figure are provided as examples. In practice, there may be Fig.12 Additional components, fewer components, different components, or components arranged in a different manner than those shown in FIG. Fig.12 Two or more components shown in may be implemented in a single component, or Fig.12 The single component shown in may be implemented as multiple distributed components. Additionally or alternatively, Fig.12 The assembly of (one or more) components shown in the executable is described as being composed of Fig.12 Another collection of components shown in the figure performs one or more functions.

[0184] The following provides an overview of some aspects of the disclosure:

[0185] Aspect 1: A method of wireless communication performed by a user equipment (UE), the method comprising: receiving an indication via sidelink communication that another UE has reserved a first channel occupancy time (COT) resource among multiple COT resources; and reserving a second COT resource among the multiple COT resources via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or sending communication via the one or more time slots associated with the first COT resource using an interleaving different from the interleaving associated with the first COT resource.

[0186] Aspect 2: The method according to aspect 1, wherein reserving the second COT resource includes reserving the second COT resource during a time period outside of the second COT resource.

[0187] Aspect 3: The method according to any one of aspects 1 to 2, wherein reserving the second COT resource comprises aligning a listen-before-talk starting point, a deferral duration, and a backup counter to avoid the first COT resource.

[0188] Aspect 4: The method according to any one of aspects 1 to 3, wherein reserving the second COT resource comprises aligning a transmission time slot with a starting position of a cyclic prefix extension to avoid the first COT resource.

[0189] Aspect 5: According to the method described in any one of Aspects 1 to 4, the method also includes selecting a listen-before-talk (LBT) window, LBT parameters and frequency domain resource assignment (FDRA) parameters before reserving the second COT resources or sending the communication via the different interleaving.

[0190] Aspect 6: The method according to aspect 5, wherein selecting the LBT window, the LBT parameters and the FDRA parameters includes aligning a counter value, a deferral duration and a starting position associated with an LBT procedure.

[0191] Aspect 7: A method according to Aspect 5, wherein selecting the LBT window, the LBT parameters and the FDRA parameters includes selecting the LBT window, the LBT parameters and the FDRA parameters based at least in part on a sidelink control information (SCI) reference signal received power (RSRP) measurement satisfying an SCI RSRP threshold.

[0192] Aspect 8: According to the method described in any one of Aspects 1 to 7, the method also includes sending side link control information (SCI) including an indication of a hop counter and an identifier associated with the other UE, wherein reserving the second COT resource or sending the communication via the different interlace includes reserving the second COT resource or sending the communication via the different interlace based at least in part on the value of the hop counter failing to satisfy a hop counter threshold.

[0193] Aspect 9: The method according to Aspect 8, wherein reserving the second COT resource also includes avoiding the first COT resource and one or more other COT resources reserved by a UE group for coordinated channel access, wherein the UE group for coordinated channel access includes other UEs.

[0194] Aspect 10: A method according to Aspect 9, wherein reserving the second COT resources also includes reserving the second COT resources at least in part based on the value of the hop counter being greater than or greater than or equal to the hop counter threshold, and at least in part based on the UE being included in the UE group for coordinated channel access.

[0195] Aspect 11: According to the method described in any one of Aspects 1 to 10, the method also includes sending or receiving side link control information (SCI), and the side link control information (SCI) includes an indication of listen-before-talk (LBT) parameters, LBT window, interleaving and the second COT resources.

[0196] Aspect 12: The method according to aspect 11, wherein the time domain resource reservation associated with the SCI indicates a plurality of contiguous COT resources and the LBT window.

[0197] Aspect 13: The method according to aspect 12, wherein the end of the LBT window indicates a location where the UE and the other UEs will complete the LBT procedure and initiate one or more transmissions using the multiple COT resources.

[0198] Aspect 14: A method according to Aspect 12, wherein the beginning of the LBT window indicates the location where the UE and the other UEs will start performing an LBT procedure based at least in part on the LBT parameters, and the end of the LBT window indicates the last location where the UE and the other UEs will complete the LBT procedure and initiate one or more transmissions using the multiple COT resources.

[0199] Aspect 15: The method according to aspect 11, wherein the frequency domain resource reservation associated with the SCI indicates one or more reserved interlaces in the second COT resources.

[0200] Aspect 16: The method according to aspect 11, wherein the SCI further includes an indication of a cyclic prefix extension start position or an indication of whether frequency division multiplexing coordinated channels are allowed.

[0201] Aspect 17: According to any one of Aspects 1 to 16, the method also includes sending or receiving sidelink control information (SCI), wherein the sidelink control information (SCI) indicates a backoff counter value to be used by the other UE for all interleavings associated with the multiple COT resources.

[0202] Aspect 18: The method according to aspect 17, wherein the SCI includes a channel access priority category parameter or an indication of a deferral duration.

[0203] Aspect 19: The method according to aspect 17, the method also includes selecting a deferral duration based at least in part on a channel access priority class associated with the UE.

[0204] Aspect 20: According to the method described in any one of Aspects 1 to 19, the method further includes sending or receiving side link control information (SCI) indicating one or more signal backoff counter values ​​for each priority class.

[0205] Aspect 21: According to any one of Aspects 1 to 20, the method also includes selecting the second COT resource using a listen-before-talk (LBT) parameter or an LBT window indicated in the sidelink control information (SCI) associated with the multiple COT resources and at least in part based on the SCI reference signal reserved power (RSRP) being greater than or greater than or equal to an SCI RSRP threshold.

[0206] Aspect 22: A method of wireless communication performed by a user equipment (UE), the method comprising: reserving a first channel occupancy time (COT) resource during a time period outside a first COT resource of a plurality of COT resources; receiving via side link communication an indication that another UE has reserved a second COT resource among the plurality of COT resources via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interleave different from an interleave associated with the first COT resource; and performing communication using the first COT resource and at least in part based on avoiding the second COT resource or the different interleave.

[0207] Aspect 23: The method according to aspect 22, wherein reserving the first COT resource includes sending an indication of a listen-before-talk (LBT) window, LBT parameters, and frequency domain resource assignment (FDRA) parameters associated with the first COT resource.

[0208] Aspect 24: A method according to any one of Aspects 22 to 23, wherein receiving the indication that the other UE has reserved the second COT resource includes receiving an indication of a listen-before-talk (LBT) window, LBT parameters and frequency domain resource assignment (FDRA) parameters associated with the second COT resource.

[0209] Aspect 25: A method according to any one of aspects 22 to 24, wherein receiving the indication that the other UE has reserved the second COT resource or sent the communication via the different interlace includes receiving an indication of a hop counter and an identifier associated with the UE.

[0210] Aspect 26: According to the method described in any one of Aspects 22 to 25, the method also includes sending or receiving side link control information (SCI), and the side link control information (SCI) includes an indication of listen-before-talk (LBT) parameters, LBT window, interleaving and the second COT resources.

[0211] Aspect 27: The method according to Aspect 26, wherein the time domain resource reservation associated with the SCI indicates a plurality of contiguous COT resources and the LBT window.

[0212] Aspect 28: The method according to Aspect 27, wherein the end of the LBT window indicates a location where the UE and the other UEs will complete the LBT procedure and initiate one or more transmissions using the plurality of COT resources.

[0213] Aspect 29: A method according to Aspect 27, wherein the beginning of the LBT window indicates the location where the UE and the other UEs will start performing an LBT procedure based at least in part on the LBT parameters, and the end of the LBT window indicates the last location where the UE and the other UEs will complete the LBT procedure and initiate one or more transmissions using the multiple COT resources.

[0214] Aspect 30: The method according to aspect 26, wherein the frequency domain resource reservation associated with the SCI indicates one or more reserved interlaces in the COT resources.

[0215] Aspect 31: The method according to aspect 26, wherein the SCI further includes an indication of a cyclic prefix extension start position or an indication of whether frequency division multiplexing coordinated channels are allowed.

[0216] Aspect 32: According to the method described in any one of Aspects 22 to 31, the method also includes sending or receiving sidelink control information (SCI), wherein the sidelink control information (SCI) indicates a backoff counter value to be used by the other UE for all interleavings associated with the multiple COT resources.

[0217] Aspect 33: The method according to aspect 32, wherein the SCI includes a channel access priority category parameter or an indication of a deferral duration.

[0218] Aspect 34: The method of aspect 32, further comprising selecting a deferral duration based at least in part on a channel access priority class associated with the UE.

[0219] Aspect 35: According to the method described in any one of Aspects 22 to 34, the method further includes sending or receiving side link control information indicating one or more signal backoff counter values ​​for each priority class.

[0220] Aspect 36: An apparatus for wireless communication 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 one or more of the methods described in Aspects 1 to 21.

[0221] Aspect 37: An apparatus for wireless communication, the apparatus 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 21.

[0222] Aspect 38: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method according to one or more of aspects 1 to 21.

[0223] Aspect 39: 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 21.

[0224] Aspect 40: 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 one or more of the methods described in aspects 1 to 21.

[0225] Aspect 41: An apparatus for wireless communication 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 one or more of the methods described in Aspects 22 to 35.

[0226] Aspect 42: An apparatus for wireless communication, the apparatus comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 22 to 35.

[0227] Aspect 43: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method according to one or more of aspects 22 to 35.

[0228] Aspect 44: 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 22 to 35.

[0229] Aspect 45: 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 one or more of the methods described in aspects 22 to 35.

[0230] While the foregoing disclosure provides illustration and description, it is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of these aspects.

[0231] 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, threads of execution, procedures and / or functions, etc. As used herein, a "processor" is implemented in a combination of hardware and / or hardware and software. It will be clear that the system and / or method 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, there is no reference to a specific software code to describe the operation and behavior of the system and / or method herein, because those skilled in the art will understand that software and hardware can be designed to implement the system and / or method based at least in part on the description herein.

[0232] 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.

[0233] Although specific combinations of features are set forth 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 that is not specifically described in the claims and / or is 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 (which 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 (e.g., 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 ordering of a, b and c).

[0234] Any element, action or instruction used herein should not be interpreted as key or necessary, unless otherwise explicitly stated. In addition, as used herein, the articles "one" and "a kind of" are 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 only one item is intended to be referred to, the phrase "only one" or similar terms are used. Moreover, as used herein, the terms "have", "have" etc. are intended to be open terms, which do not limit the elements they modify (for example, "elements with" A can also have B). In addition, the phrase "based on" is intended to represent "based at least in part on", unless explicitly stated otherwise. Furthermore, as used herein, the term "or" when used in a series is intended to be open-ended and may be used interchangeably with "and / or" unless explicitly stated otherwise (eg, if used in conjunction with "either" or "only one of").

Claims

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: Memory; and one or more processors coupled to the memory and configured to: receiving, via a sidelink communication, an indication that another UE has reserved a first channel occupancy time (COT) resource from among a plurality of COT resources; as well as A second COT resource among the plurality of COT resources is reserved via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or a communication is sent via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

2. The apparatus of claim 1, wherein to reserve the second COT resource, the one or more processors are configured to align a listen-before-talk starting point, a deferral duration, and a backup counter to avoid the first COT resource.

3. The apparatus of claim 1, wherein to reserve the second COT resource, the one or more processors are configured to align a transmission time slot with a starting position of a cyclic prefix extension to avoid the first COT resource.

4. The apparatus of claim 1 , wherein the one or more processors are further configured to select a listen-before-talk (LBT) window, LBT parameters, and frequency domain resource assignment (FDRA) parameters before reserving the second COT resources or sending the communication via the different interlaces.

5. The apparatus of claim 4, wherein, in order to select the LBT window, the LBT parameters, and the FDRA parameters, the one or more processors are configured to align a counter value, a deferral duration, and a starting position associated with an LBT procedure.

6. The apparatus of claim 4, wherein, to select the LBT window, the LBT parameters, and the FDRA parameters, the one or more processors are configured to select the LBT window, the LBT parameters, and the FDRA parameters based at least in part on a sidelink control information (SCI) reference signal received power (RSRP) measurement satisfying an SCI RSRP threshold.

7. The apparatus of claim 1 , wherein the one or more processors are further configured to send sidelink control information (SCI) comprising an indication of a hop counter and an identifier associated with the other UE, wherein reserving the second COT resource or sending the communication via the different interlace comprises reserving the second COT resource or sending the communication via the different interlace based at least in part on a failure of the value of the hop counter to satisfy a hop counter threshold.

8. The apparatus of claim 7, wherein reserving the second COT resource further comprises avoiding the first COT resource and one or more other COT resources reserved by a UE group for coordinated channel access, wherein the UE group for coordinated channel access comprises other UEs.

9. The apparatus of claim 8, wherein to reserve the second COT resource, the one or more processors are configured to reserve the second COT resource based at least in part on the value of the hop counter being greater than or greater than or equal to the hop counter threshold, and based at least in part on the UE being included in the UE group for coordinated channel access.

10. The apparatus of claim 1, wherein the one or more processors are further configured to send or receive sidelink control information (SCI), the sidelink control information (SCI) comprising an indication of a listen-before-talk (LBT) parameter, an LBT window, interleaving, and the second COT resource.

11. The apparatus of claim 10, wherein a frequency domain resource reservation associated with the SCI indicates one or more reserved interlaces in the second COT resources.

12. The apparatus according to claim 10, wherein the SCI further comprises an indication of a cyclic prefix extension start position or an indication of whether frequency division multiplexing coordinated channels are allowed.

13. The apparatus of claim 1, wherein the one or more processors are further configured to send or receive sidelink control information (SCI) indicating a backoff counter value to be used by the other UE for all interlaces associated with the plurality of COT resources.

14. The apparatus of claim 13, wherein the one or more processors are further configured to select a deferral duration based at least in part on a channel access priority class associated with the UE.

15. The apparatus of claim 1, wherein the one or more processors are further configured to send or receive sidelink control information indicating one or more signal backoff counter values ​​for each priority class.

16. An apparatus according to claim 1, wherein the one or more processors are further configured to select the second COT resource using a listen-before-talk (LBT) parameter or an LBT window indicated in sidelink control information (SCI) associated with the multiple COT resources and at least in part based on an SCI reference signal reserved power (RSRP) being greater than or greater than or equal to an SCI RSRP threshold.

17. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: Memory; and one or more processors coupled to the memory and configured to: reserving a channel occupancy time (COT) resource during a time period outside of a first COT resource of a plurality of COT resources; receiving, via a sidelink communication, an indication that another UE has reserved a second COT resource of the plurality of COT resources via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource; as well as Communicating is performed using the first COT resources and based at least in part on avoiding the second COT resources or the different interlace.

18. The apparatus of claim 17, wherein the one or more processors are configured to send an indication of a listen-before-talk (LBT) window, LBT parameters, and frequency domain resource assignment (FDRA) parameters associated with the first COT resource.

19. The apparatus of claim 17, wherein to receive an indication that the other UE has reserved the second COT resource or sent the communication via the different interlace, the one or more processors are configured to receive an indication of a hop counter and an identifier associated with the UE.

20. The apparatus of claim 17, wherein the one or more processors are further configured to send or receive sidelink control information (SCI), the sidelink control information (SCI) comprising an indication of a listen-before-talk (LBT) parameter, an LBT window, interleaving, and the second COT resource.

21. The apparatus of claim 20, wherein a time domain resource reservation associated with the SCI indicates a plurality of contiguous COT resources and the LBT window.

22. The apparatus of claim 20, wherein a frequency domain resource reservation associated with the SCI indicates one or more reserved interlaces in the COT resources.

23. The apparatus of claim 20, wherein the SCI further comprises an indication of a cyclic prefix extension start position or an indication of whether frequency division multiplexing coordinated channels are allowed.

24. The apparatus of claim 17, wherein the one or more processors are further configured to send or receive sidelink control information (SCI) indicating a backoff counter value to be used by the other UEs for all interlaces associated with the plurality of COT resources.

25. The apparatus of claim 17, wherein the one or more processors are further configured to send or receive sidelink control information indicating one or more signal backoff counter values ​​for each priority class.

26. A method of wireless communication performed by a user equipment (UE), the method comprising: receiving, via a sidelink communication, an indication that another UE has reserved a first channel occupancy time (COT) resource from among a plurality of COT resources; as well as A second COT resource among the plurality of COT resources is reserved via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or a communication is sent via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource.

27. The method of claim 26, wherein reserving the second COT resource comprises aligning a listen-before-talk starting point, a deferral duration, and a backup counter to avoid the first COT resource.

28. The method of claim 26, further comprising selecting a listen-before-talk (LBT) window, LBT parameters, and frequency domain resource assignment (FDRA) parameters prior to reserving the second COT resources or sending the communication via the different interlace.

29. A method of wireless communication performed by a user equipment (UE), the method comprising: reserving a channel occupancy time (COT) resource during a time period outside of a first COT resource of a plurality of COT resources; receiving, via a sidelink communication, an indication that another UE has reserved a second COT resource of the plurality of COT resources via one or more time slots associated with the first COT resource and using frequency division multiplexing (FDM) channel access, or that the other UE has sent a communication via the one or more time slots associated with the first COT resource using an interlace different from an interlace associated with the first COT resource; as well as Communicating is performed using the first COT resources and based at least in part on avoiding the second COT resources or the different interlace.

30. The method of claim 29, wherein reserving the first COT resource comprises sending an indication of a listen-before-talk (LBT) window, LBT parameters, and frequency domain resource assignment (FDRA) parameters associated with the first COT resource.

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