Coordinated access to unlicensed spectrum

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may send an indication of a resource reservation associated with an unlicensed spectrum specifying at least a listen before talk (LBT) parameter associated with category 4 (CAT 4) access to the unlicensed spectrum and an interleaving index associated with a resource in the unlicensed spectrum assigned to a participant UE, the participant UE is associated with coordinated access to the unlicensed spectrum. The UE may communicate in a wireless network based at least in part on the resource reservation, the LBT parameter, and the interleaving index associated with the unlicensed spectrum. Numerous other aspects are described.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for coordinated access to unlicensed spectrum. Background Art

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

[0003] A wireless network may include one or more base stations that support communications for a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink communications and uplink communications. A "downlink" (or "DL") refers to the communication link from a base station to a UE, and an "uplink" (or "UL") refers to the communication link from a UE to a base station.

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

[0005] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with Category 4 (CAT 4) access to the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum. The method may include communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0006] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include receiving an indication of a resource reservation associated with an unlicensed spectrum, the indication at least specifying an LBT parameter associated with a channel access procedure to the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum. The method may include communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0007] Some aspects described herein relate to an apparatus for wireless communication at 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 send an indication of a resource reservation associated with an unlicensed spectrum, the indication at least specifying an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE, the participant UE being associated with coordinated access to the unlicensed spectrum. The one or more processors may be configured to communicate in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0008] Some aspects described herein relate to an apparatus for wireless communication at 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 of a resource reservation associated with an unlicensed spectrum, the indication at least specifying an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum. The one or more processors may be configured to communicate in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0009] 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 send an indication of a resource reservation associated with an unlicensed spectrum, the indication at least specifying an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE, the participant UE being associated with coordinated access to the unlicensed spectrum. The instruction set, when executed by one or more processors of the UE, may cause the UE to communicate in a wireless network based at least in part on the resource reservation, the LBT parameter, and the interleaving index associated with the unlicensed spectrum.

[0010] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication via one or more instructions, which, when executed by one or more processors of a UE, may cause the UE to receive an indication of a resource reservation associated with an unlicensed spectrum, the indication at least specifying an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum. The instruction set, when executed by one or more processors of the UE, may cause the UE to communicate in a wireless network based at least in part on the resource reservation, the LBT parameter, and the interleaving index associated with the unlicensed spectrum.

[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum. The apparatus may include means for communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0012] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the apparatus, the indication being associated with coordinated access to the unlicensed spectrum. The apparatus may include means for communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0013] Aspects of the present invention generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices and / or processing systems as fully described herein with reference to the accompanying drawings and descriptions and as illustrated in the accompanying drawings and descriptions.

[0014] The features and technical advantages of examples according to the present disclosure have been outlined quite extensively above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims.

[0015] Although various aspects are described in the present disclosure by illustrating some examples, it will be understood by those skilled in the art that such aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip implementations or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment and / or artificial intelligence devices). Various aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components and / or system-level components. The equipment incorporating the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include one or more components (e.g., hardware components, including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders and / or summers) for analog and digital purposes. The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements and / or end-user devices of various sizes, shapes and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0018] Figure 2 is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless network according to the present disclosure.

[0019] Figure 3 is a diagram illustrating an example of side link communication according to the present disclosure.

[0020] Figure 4 is a diagram illustrating an example of side link communication and access link communication according to the present disclosure.

[0021] Figure 5 is a diagram illustrating an example of sidelink communications based at least in part on accessing unlicensed spectrum in accordance with the present disclosure.

[0022] Figure 6 is a diagram illustrating an example of coordinated channel access to unlicensed spectrum for sidelink communications according to the present disclosure.

[0023] Figure 7 An example of a wireless communication process between a first UE, a second UE, and a third UE in a wireless communication network according to the present disclosure is illustrated.

[0024] Figure 8 is a diagram illustrating an example process performed, for example, by a UE according to the present disclosure.

[0025] Fig. 9 is a diagram illustrating another example process performed, for example, by a UE according to the present disclosure.

[0026] Fig.10 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0027] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. It should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the 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 a device or method that is practiced using other structures, functions, or structures and functions in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

[0028] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0029] Although various aspects may be described herein using terms generally associated with 5G or new radio (NR) radio access technologies (RATs), various aspects of the present disclosure may be applicable to other RATs, such as 3G RATs, 4G RATs, and / or post-5G RATs (e.g., 6G).

[0030] 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, etc. The wireless network 100 may include one or more base stations 110 (shown as BS110a, BS110b, BS110c, and BS110d), a user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE120b, UE 120c, UE 120d, and UE 120e), and / or other network entities. The base station 110 is an entity that communicates with the UE 120. The base station 110 (sometimes referred to as a BS) 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, and / or a transmit receive point (TRP). Each base station 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 ​​a base station 110 and / or a base station subsystem serving the coverage area, depending on the context in which the term is used.

[0031] Base station 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 UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by 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 UE 120 associated with the femto cell (e.g., UE 120 in a closed subscriber group (CSG)). A base station 110 for a macro cell may be referred to as a macro base station. A base station 110 for a pico cell may be referred to as a pico base station. A base station 110 for a femto cell may be referred to as a femto base station or a home base station. In Figure 1 In the example shown, BS 110a may be a macro base station for macrocell 102a, BS 110b may be a pico base station for picocell 102b, and BS 110c may be a femto base station for femtocell 102c. A base station may support one or more (eg, three) cells.

[0032] In some examples, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile base station 110 (e.g., a mobile base station). In some examples, the base stations 110 may be interconnected with each other and / or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 using any suitable transport network through various types of backhaul interfaces, such as direct physical connections or virtual networks.

[0033] The deployment of a communication system (such as a 5G NR system) can be arranged in a variety of ways with various components or constituent parts. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element, a base station, or network equipment can be implemented in a clustered or decomposed architecture. For example, a base station (such as a node B (NB), an evolved NB (eNB), an NR base station (BS), a 5G NB, a gNodeB (gNB), an access point (AP), a transmit receive point (TRP), or a cell) or one or more units (or one or more components) performing base station functionality can be implemented as a clustered base station (also referred to as a standalone base station or a monolithic base station) or a decomposed base station. A "network entity" or a "network node" may refer to a decomposed base station or one or more units of a decomposed base station (such as one or more CUs, one or more DUs, one or more RUs, or a combination thereof).

[0034] A converged base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). A decomposed base station may be configured to utilize a protocol stack that is physically or logically distributed between two or more units (such as one or more CUs, one or more DUs, or one or more RUs). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed in one or more other RAN 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 (e.g., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU)).

[0035] Base station type operations or network designs may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be used in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (network configurations such as those 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 scaling of a communication system by separating base station functionality into one or more units that can be deployed separately. A disaggregated 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 disaggregated base station may be configured for wired or wireless communication with at least one other unit of the disaggregated base station.

[0036] The wireless network 100 may include one or more relay stations. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a base station 110 or a UE 120) and transmit transmissions of data to a downstream station (e.g., a UE 120 or a base station 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown, BS 110d (eg, a relay base station) may communicate with BS 110a (eg, a macro base station) and UE 120d to facilitate communication between BS 110a and UE 120d. A base station 110 that relays communications may be referred to as a relay station, relay base station, relay, or the like.

[0037] The wireless network 100 may be a heterogeneous network that includes different types of base stations 110, such as macro base stations, pico base stations, femto base stations, relay base stations, etc. These different types of base stations 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 base station may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico base station, a femto base station, and a relay base station may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0038] The network controller 130 may be coupled to or in communication with a set of base stations 110 and may provide coordination and control for the base stations 110. The network controller 130 may communicate with the base stations 110 via backhaul communication links. The base stations 110 may also communicate directly with each other or indirectly via wireless or wired backhaul communication links.

[0039] UE 120 can be dispersed throughout wireless network 100, and each UE 120 can be stationary 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device and / or any other suitable device configured to communicate via a wireless medium.

[0040] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that may communicate with a base station, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0041] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, frequency channel, etc. In a given geographic area, each frequency may support a single RAT to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0042] 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 base station 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 base station 110.

[0043] The devices of the wireless network 100 may communicate using an electromagnetic spectrum that may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, the devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency ranges designated FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). It should be understood that, although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the “below 6 GHz” band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the “millimeter wave” band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0044] 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.

[0045] In view of the above examples, unless otherwise specifically stated, it should be understood that if the term "below 6 GHz" or the like is used herein, the term may broadly refer to frequencies that may be lower than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used herein, the term may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or may 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) may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0046] In some aspects, UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may send an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure (e.g., an LBT access) for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum; and communicate in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0047] Alternatively or additionally, the communication manager 140 may receive an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure (e.g., LBT access) for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum; and communicate in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0048] As indicated above, Figure 1 are provided as examples. Other examples can be found in the Figure 1 Different than described.

[0049] Figure 22 is a diagram illustrating an example 200 of base station 110 communicating with UE 120 in wireless network 100 according to the present disclosure. Base station 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1).

[0050] At the base station 110, the transmit processor 220 may receive data intended for the UE 120 (or a group of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQI) received from the UE 120. The base station 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 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 set of corresponding modems 232 (e.g., T modems) (shown as modems 232a to 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may also process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 232t may transmit a set of downlink signals (e.g., T downlink signals) via a set of corresponding antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0051] At the UE 120, a group of antennas 252 (shown as antennas 252a to 252r) may receive downlink signals from the base station 110 and / or other base stations 110, and may provide a group of received signals (e.g., R received signals) to a group 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 destined 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.

[0052] 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 base station 110 via the communication unit 294.

[0053] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more groups of antenna elements, and / or one or more antenna arrays, etc. An antenna panel, an antenna group, a group of antenna elements, and / or an antenna array may include one or more antenna elements (in a single housing or multiple housings), a group of coplanar antenna elements, a group of non-coplanar antenna elements, and / or may be coupled to one or more transmit and / or receive components (such as, Figure 2 One or more antenna elements of one or more components).

[0054] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the 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 base station 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, with reference to Figures 5 to 10 ) or any aspect of any of the methods described herein.

[0055] At the base station 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 of the modem 232 shown as DEMOD), 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 base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communications. In some examples, the modem 232 of the base station 110 may include a modulator and a demodulator. In some examples, the base station 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 execute the instructions described herein (e.g., reference 20). Figures 5 to 10 ) or any aspect of any of the methods described herein.

[0056] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 8 Process 800, Fig. 9 900 and / or other processes as described herein. Memory 242 and memory 282 may store data and program codes for base station 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compilation, conversion, and / or interpretation) by one or more processors of base station 110 and / or UE 120, may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example, Figure 8 Process 800, Fig. 9 The process 900 and / or the operation of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, etc.

[0057] In some aspects, the UE includes means for sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure (e.g., LBT access) for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum; and / or means for communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index. The means for the UE to perform operations described herein may include, for example, one or more of the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0058] In some aspects, the UE includes means for receiving an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure (e.g., LBT access) for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum; and / or means for communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index. The means for the UE to perform operations described herein may include, for example, one or more of the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0059] 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 with respect to 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.

[0060] As indicated above, Figure 2 are provided as examples. Other examples can be found in the Figure 2 Different than described.

[0061] Figure 3 is a diagram illustrating an example 300 of sidelink communications according to the present disclosure.

[0062] like Figure 3 As shown in , the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more side link channels 310. UEs 305-1 and 305-2 can communicate using one or more side link channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication and / or V2P communication) and / or mesh networks. In some aspects, UE 305 (e.g., UE 305-1 and / or UE 305-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, one or more side link channels 310 may use a PC5 interface and / or may operate in a high frequency band (e.g., a 5.9 GHz band). Additionally or alternatively, UE 305 may use global navigation satellite system (GNSS) timing to synchronize the timing of a transmit time interval (TTI) (e.g., a frame, subframe, time slot, or symbol).

[0063] 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 base station 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 base station 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).

[0064] 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.

[0065] 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.

[0066] 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 base station 110. For example, UE 305 may receive a grant for sidelink channel access and / or scheduling from base station 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 base station 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.

[0067] 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).

[0068] 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).

[0069] As indicated above, Figure 3 are provided as examples. Other examples can be found in the Figure 3 Different than described.

[0070] Figure 4 is a diagram illustrating an example 400 of side link communications and access link communications according to the present disclosure.

[0071] 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 base station 110 can communicate with the Tx / Rx UE 405 via the first access link. Additionally or alternatively, in some sidelink modes, the base station 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 may 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 base station 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 base station 110 to UE 120) or uplink communications (from UE 120 to base station 110).

[0072] As indicated above, Figure 4 are provided as examples. Other examples can be found in the Figure 4 Different than described.

[0073] Figure 5 is a diagram illustrating an example 500 of sidelink communications based at least in part on accessing unlicensed spectrum in accordance with the present disclosure.

[0074] In some aspects, the UE may perform an LBT process and / or a clear channel assessment (CCA) to obtain access to a frequency band and / or a wireless channel based at least in part on a portion of an unlicensed spectrum. "Unlicensed spectrum" may refer to a spectrum that can be utilized by any device without exclusive access (e.g., a portion of a frequency that can be accessed without a license). "LBT process" may refer to an operation and / or process of determining whether a signal occupies a wireless channel and / or a frequency band (or whether a wireless channel is not occupied by a signal). As an example, the LBT process may determine whether there is or is not energy in a wireless channel. The phrase "LBT clear" or similar phrases may indicate that the LBT process determines that there is no energy in the wireless channel and / or that the wireless channel is idle for use. Therefore, when the LBT process determines that the wireless channel is idle for use, the UE may obtain access to the unlicensed spectrum within a time length referred to as a channel occupancy time (COT). In some aspects, the time length associated with the COT may be characterized and / or divided into smaller time durations, such as multiple time slots. During the COT, the UE may perform uplink transmissions without performing additional LBT processes.

[0075] like Figure 5As shown, an example COT structure 502 associated with an unlicensed spectrum may be based at least in part on one or more resources, which may be characterized at least in part by a time duration 504 (e.g., shown on a horizontal axis representing time). Each resource of the COT structure 502 may be associated with a corresponding frequency span (e.g., shown on a vertical axis representing frequency), so that the COT structure 502 may include multiple resources associated with different frequency spans of the time duration 504. The COT resources may alternatively or additionally be referred to as "interlaces". With respect to the COT structure 502, a first resource labeled as interlace #0 may be based at least in part on the time duration 504 and the first frequency span 506. A second resource allocation labeled as interlace #1 may be based at least in part on the time duration 504 and a second frequency span different from the first frequency span 506. Similarly, a third resource labeled as interlace #2, a fourth resource labeled as interlace #3, and a fifth resource labeled as interlace #4 may each be based at least in part on the time duration 504 and the corresponding frequency span. In some aspects, the frequency span associated with the interleaving may be characterized and / or divided into smaller frequency spans (e.g., subbands). The attached numbers 0 to 4 may refer to interleaving indices, such that a particular interleaving may be identified based at least in part on the corresponding interleaving indices. Although the COT structure 502 of example 500 includes five interleavings, other examples may include more or fewer interleavings that are continuous in frequency, equidistantly spaced from each other in frequency, and / or equidistantly separated from each other in frequency. A COT structure (such as COT structure 502) based at least in part on frequency division multiplexing (FDM) may enable multiple devices to transmit during the same COT based at least in part on using different frequency spans (and interleavings) relative to other devices.

[0076] The time duration of COT may depend on the type of LBT process and one or more LBT parameters associated with the LBT process. Example LBT process categories may include Category 1 (CAT 1) LBT, Category 2 (CAT 2) LBT, Category 3 (CAT 3) LBT, and Category 4 (CAT 4) LBT. In CAT 1 LBT (also known as no LBT), the LBT process is not performed before sending a communication on the channel. In CAT 2 LBT, the time duration associated with channel sensing is fixed (e.g., there is no random backoff). In some aspects, "channel sensing" may mean determining whether a channel is idle within a time duration, which may also be referred to as a contention window. For example, a fixed (channel sensing) time duration of 16 microseconds is used for a 16 microsecond CAT 2 LBT, and a fixed (channel sensing) time duration of 25 microseconds is used for a 25 microsecond CAT 2 LBT. In CAT 3 LBT, the channel sensing time duration is fixed (e.g., the contention window has a fixed size), and a random backoff is used. In CAT 4 LBT, the channel sensing time duration is variable (eg, the contention window has a variable size), and random backoff is used.

[0077] In CAT 4LBT, the channel sensing time duration may vary depending on whether a device contending for access to the channel senses interference (e.g., an energy level greater than or equal to a threshold). Using the CAT 4LBT process, a device may select a minimum channel sensing time duration, which may be defined by a channel access priority level (CAPC) associated with the CAT 4LBT process being used by the device. For example, four different CAPCs may be associated with CAT 4LBT, with the lowest CAPC value (e.g., CAPC 0) being associated with the highest priority for CAT 4LBT (e.g., the shortest contention window size and the shortest backoff duration), and the highest CAPC value (e.g., CAPC 3) being associated with the lowest priority for CAT 4LBT (e.g., the longest contention window size and the longest backoff duration). In some aspects, higher CAPC values ​​(e.g., higher CAPC indexes) are associated with lower priorities. In CAT 4 LBT, if a device detects interference within the minimum channel sensing duration for a CCA procedure as defined by the CAPC for the CAT 4 LBT procedure, the device may increase the channel sensing duration for the next CCA procedure.

[0078] In some aspects, the UE may select and reserve an interlace that occurs in a future COT for sidelink transmission, and indicate the selection and / or reservation to other UEs. As an example, the first UE 508 may select an interlace based at least in part on identifying that the associated data buffer includes data for transmission. In example 500, the first UE 508 selects interlace #0 associated with the COT structure 502. Based at least in part on selecting the interlace associated with the future COT, the first UE 508 may indicate the reservation to other UEs (shown as the second UE 510 and the third UE 512). For illustration, the first UE 508 may send an indication as shown by reference numeral 514, wherein the indication specifies the reservation of interlace #0 associated with the COT structure 502. The transmission associated with the first UE 508 is shown in example 500 by using a diagonal hashing pattern.

[0079] In one example, the first UE 508 may send the indication in a groupcast SCI (e.g., in a COT resource 516 associated with a previous time duration relative to the time duration 504). A "groupcast" transmission (such as a transmission associated with a groupcast SCI) may represent a one-to-many transmission, in which a single device (e.g., the first UE 508) transmits information that can be received and recovered by multiple devices (such as UE 510 and UE 512). At a start time associated with the time duration 504, the first UE 508 may perform an LBT procedure (e.g., a CAT 4 LBT procedure) based at least in part on the contention window 518 associated with the COT structure 502, and transmit the information using interlace #0, as shown by reference numeral 520.

[0080] In a similar manner to the first UE 508, the second UE 510 and the third UE 512 may each determine to use resources associated with the COT structure 502 to send information. Based at least in part on the indication received by the first UE 508, the second UE 510 and the third UE 512 may each avoid selecting interlace #0 for sending the corresponding information. However, avoiding selecting interlace #0 may cause the second UE 510 and the third UE 512 to select the same resources associated with the COT structure 502, such as interlace #4. In some aspects, the second UE 510 and / or the third UE 512 may send an indication of a reservation specifying interlace #4, but another UE may fail to receive and process the indication before the time duration 504 and / or the contention window 518 begins. Therefore, each UE may perform an LBT process, and after the LBT is cleared, the second UE 510 and the third UE 512 may each use interlace #4 to send information so that the two transmissions conflict with each other, as shown by reference numeral 522. Transmissions by the second UE 510 are shown using a crossed-line hashing pattern, and transmissions by the third UE 512 are shown using a dashed-line hashing pattern. Collisions may increase recovery failures and / or errors at the receiver, reduce data throughput in sidelink communications, and / or consume additional resources (e.g., using retransmissions).

[0081] Some techniques and apparatus described herein provide coordinated LBT channel access to unlicensed spectrum. In some aspects, a UE (e.g., acting as a coordinator UE) may send an indication of a resource reservation associated with an unlicensed spectrum. As an example, the indication may at least specify an LBT parameter associated with a channel access process (e.g., LBT access) for accessing an unlicensed spectrum and an interleaving index associated with a resource in an unlicensed spectrum assigned to a participant UE. A participant UE may be associated with coordinated access to an unlicensed spectrum managed at least in part by a UE acting as a coordinator UE. Based at least in part on sending the indication, the UE may communicate in a wireless network based at least in part on a resource reservation, LBT parameter, and interleaving index associated with an unlicensed spectrum. As an example, a UE may transmit in a first resource assigned to the UE and / or avoid transmitting in a second resource assigned to another UE.

[0082] In some aspects, a UE (e.g., acting as a participant UE) may receive an indication of a resource reservation associated with an unlicensed spectrum. The indication may also specify at least LBT parameters associated with CAT 4 access (e.g., LBT access) to the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE. The indication received by the UE may be associated with coordinated access to the unlicensed spectrum managed at least in part by a coordinator UE different from the receiving UE. Based at least in part on receiving the indication, the UE may communicate in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters, and the interleaving index. As an example, the UE may transmit in a first resource assigned to the UE and / or avoid transmitting in a second resource assigned to another UE.

[0083] By coordinating LBT channel access to unlicensed spectrum, the coordinating UE can mitigate other UEs operating within a distance threshold of each other from selecting the same resources (e.g., interlaces associated with COT) and mitigate transmission conflicts, such as conflicts in sidelink communications. Mitigating transmission conflicts can improve sidelink communications by reducing recovery failures and / or errors at the receiver, increasing data throughput, and / or reducing resource consumption.

[0084] As indicated above, Figure 5 are provided as examples. Other examples can be found in the Figure 5 Different than described.

[0085] Figure 6 is a diagram illustrating an example 600 of coordinated LBT channel access for sidelink communications according to the present disclosure.

[0086] In a manner similar to that described with respect to example 500, example 600 includes a COT structure 602 that includes a plurality of resources associated with accessing an unlicensed spectrum (e.g., interlace #0, interlace #1, interlace #2, interlace #3, and interlace #4). The resources may be defined by a time duration 604 shown on a horizontal axis representing time and one or more frequency spans shown on a vertical axis representing frequency.

[0087] As further described below, example 600 also illustrates transmissions that may be associated with one or more UEs in a group of UEs (e.g., a first UE 606, a second UE 608, and / or a third UE 610). Including each UE in the group may be based at least in part on each UE operating at a location that satisfies a distance threshold relative to each other. Alternatively or additionally, the group of UEs may be based at least in part on each UE selecting to participate in coordinated access to an unlicensed spectrum. Transmissions by the first UE 606, the second UE 608, and the third UE 610 are illustrated using a diagonal hashing pattern, a cross-hash hashing pattern, and a dashed hashing pattern, respectively.

[0088] In some aspects, the first UE 606 may act as a coordinator UE for a group of UEs participating in coordinated access to an unlicensed spectrum. As an example, the first UE 606 may receive an instruction from a network entity (e.g., the base station 110) to act as a coordinator UE for sidelink communications. As another example, the first UE 606 may determine to act as a coordinator UE, such as with respect to Figure 7 Further described.

[0089] As shown by reference numeral 612, and based at least in part on the first UE 606 acting as a coordinator UE, the first UE 606 may send a request and / or pull SCI (e.g., an SCI configured to pull information from a receiving device) to obtain information from one or more UEs that may be within the transmission and / or reception distance of the coordinator UE. As an example, the first UE 606 may send a pull SCI and / or request (e.g., via SCI) to obtain a channel access request (CAR) and / or a buffer status report (BSR) from a UE, wherein the CAR and / or BSR may be used by the UE to indicate that the UE has information to be sent. The first UE 606 may send the pull SCI as a multicast SCI to one or more UEs (e.g., within the group of UEs and / or outside the group of UEs). However, in other examples, the first UE 606 may avoid sending a request and / or pull SCI. For illustration, the first UE 606 may monitor the SCI without sending the pull SCI to obtain periodic and / or autonomous CARs and / or BSRs associated with the sidelink communication. In some aspects, the pull SCI may be sent and / or configured as SCI-1.

[0090] As shown by reference numeral 614, the first UE 606 may send an indication of a first resource reservation for the first UE 606 in the pulled SCI. For example, the first UE 606 may send an indication of the first resource reservation to indicate that the first UE 606 may communicate one or more resource reservations and / or assignments associated with coordinated access to an unlicensed spectrum based at least in part on the indicated resource reservation. In some aspects, the first UE 606 may include in the indication a multicast identifier (ID) that may be associated with coordinated access to an unlicensed spectrum, a UE managing coordinated access (e.g., the first UE 606), and / or a group of UEs participating in coordinated access. As shown in example 600, the first UE 606 may send the indication shown by reference numeral 612 based at least in part on a first COT resource 616 associated with a time duration that is prior to and different from the time duration 604.

[0091] As shown by reference numeral 618 and reference numeral 620, the second UE 608 and / or the third UE 610 may send a (corresponding) CAR and / or BSR. In some aspects, the second UE 608 and / or the third UE 610 may send a (corresponding) CAR and / or BSR based at least in part on receiving a request from the first UE 606 and / or pulling the SCI. Alternatively, the UE 608 or the UE 610 may autonomously send a CAR and / or BSR, such as by sending a CAR and / or BSR based at least in part on the presence of data in the identification data buffer that may be associated with future transmissions. In addition, each of the UE 608 and the UE 610 may send a single instance of a CAR and / or BSR, or periodically send an updated CAR and / or BSR. As an example, pulling the SCI may indicate sending a periodic (updated) CAR and / or BSR. As another example, pulling the SCI may indicate sending a single instance of a CAR and / or BSR.

[0092] In example 600, the second UE 608 and / or the third UE 610 may send a CAR and / or a BSR based at least in part on the COT resources 616. For example, either or both of the two UEs may send the CAR and / or the BSR as SCI-2. However, in other examples, either or both of the two UEs may use alternative resources. In some aspects, a UE (e.g., the second UE 608 and / or the third UE 610) may identify a transmission resource (e.g., for sending a CAR and / or a BSR) based at least in part on a groupcast ID sent by the first UE 606. As an example, each UE may be assigned a specific groupcast ID, and the UE may determine the transmission resource based at least in part on using the groupcast ID as an address offset, thereby determining the PSFCH resource. The UE may send a CAR and / or a BSR in the identified transmission resource based at least in part on using the PSFCH and / or PSSCH (such as by using a medium access control (MAC) control element (CE) associated with the PSFCH).

[0093] Based at least in part on acting as a coordinating UE, the first UE 606 may select one or more (corresponding) resources and assign them to the second UE 608 and / or the third UE 610, as described with respect to Figure 7 As further described. As shown by reference numeral 622, the first UE 606 may send an indication 624 of one or more resource reservations associated with the unlicensed spectrum, such as by sending an indication of an interlace index associated with the COT structure 602. In some aspects, the transmission shown by reference numeral 622 may be referred to as a coordinated access reservation SCI. As shown in example 600, the coordinated access reservation SCI may indicate a first resource reservation that assigns a first interlace (e.g., interlace #0) of the COT structure 602 to the first UE 606, a second interlace (e.g., interlace #2) of the COT structure 602 to the second UE 608, and / or a third interlace (e.g., interlace #4) of the COT structure 602 to the third UE 610. For illustration, the first UE 606 may specify an interlace index and / or a UE ID associated with the interlace index via the indication 624. In some aspects, the first UE 606 may send one or more LBT parameters associated with CAT 4 access to the COT structure 602 as part of the coordinated access reservation SCI, such as regarding Figure 7 The first UE 606 may send an indication 624 based at least in part on a second COT resource 626 based at least in part on a time duration different from the time duration 604 associated with the COT structure 602 and the time duration associated with the first COT resource 616 .

[0094] Based at least in part on the coordinated access reservation SCI sent by the first UE 606, the first UE 606, the second UE 608, and / or the third UE 610 may perform a CAT 4 LBT access procedure associated with accessing the assigned resources of the COT structure 602. In some aspects, each UE may perform a CAT 4 LBT access procedure based at least in part on a corresponding contention window that may be specified by one or more LBT parameters. For example, the first UE 606 may perform a CAT 4 LBT access procedure based at least in part on the first contention window 628, the second UE 608 may perform a CAT 4 LBT access procedure based at least in part on the second contention window 630, and / or the third UE 610 may perform a CAT 4 LBT access procedure based at least in part on the third contention window 632. Each UE may transmit in the assigned resources of the COT structure 602 based at least in part on LBT clearing. For illustration, the first UE 606 may transmit in interlace #0, as shown by reference numeral 634, the second UE 608 may transmit in interlace #2, as shown by reference numeral 636, and / or the third UE 610 may transmit in interlace #4, as shown by reference numeral 638.

[0095] Coordinated access to unlicensed spectrum enables UEs participating in the coordinated access to mitigate transmission conflicts in sidelink communications. Mitigating transmission conflicts can increase data throughput and / or reduce resource consumption by improving signal quality, reducing recovery failures and / or errors at the receiver, and reducing retransmissions.

[0096] As indicated above, Figure 6 are provided as examples. Other examples can be found in the Figure 6 Different than described.

[0097] Figure 7 An example of a wireless communication process between a first UE 701 (e.g., UE 120), a second UE 702 (e.g., another UE 120), and a third UE 703 (e.g., another UE 120) in a wireless communication network according to the present disclosure is illustrated. In some aspects, the first UE 701 may act as a coordinator UE for coordinated access to an unlicensed spectrum. Alternatively or additionally, the second UE 702 and the third UE 703 may act as participant UEs in the coordinated access to the unlicensed spectrum. Although example 700 shows a single coordinator UE and two participant UEs, other examples may include more coordinator UEs, more participant UEs, and / or fewer participant UEs.

[0098] As indicated by reference numeral 710, the first UE 701 may determine to act as a coordinator UE for coordinated access to an unlicensed spectrum. As an example, the first UE 701 may determine to act as a coordinator UE based at least in part on an instruction received from a network entity (e.g., a base station 110) to act as a coordinator UE. Alternatively or additionally, the first UE 701 may determine to act as a coordinator UE based at least in part on an identification indicating a condition to act as a coordinator UE. For illustration, the first UE 701 may receive (corresponding) coordinated access reservation SCIs from one or more coordinator UEs, and determine that some coordinated access reservation SCIs are invalid. In some aspects, the first UE 701 may identify a valid coordinated access reservation SCI based at least in part on the operating location of the transmitting coordinator UE. For example, the first UE 701 may determine that the coordinated access reservation SCI is valid based at least in part on the operating location satisfying a distance threshold (e.g., the transmitting coordinator UE is operating within the range of the first UE 701), and determine that the coordinated access reservation SCI is invalid based at least in part on the operating location failing to satisfy the distance threshold. The first UE 701 may determine to act as a coordinator UE based at least in part on failure to receive valid coordinated access reservation side link control information from a required number of coordinator UEs. The required number may be based at least in part on satisfying a count threshold. The first UE 701 may act as a single coordinator UE of a group of UEs, or may act as one of the coordinator UEs of multiple coordinator UEs of the group of UEs.

[0099] As shown by reference numeral 720, the first UE 701 may send an indication of a request for information associated with future transmissions, and the second UE 702 and / or the third UE 703 may receive the indication. For illustration, the first UE 701 may send the indication as a broadcast message and / or a multicast message that multiple devices may receive and recover. As an example, the first UE 701 may send a pull SCI requesting information to one or more UEs within a receiving distance (e.g., a distance associated with successful recovery of the pull SCI). Alternatively or additionally, the first UE 701 may send the pull SCI as SCI-1 associated with the PSSCH transmission. In some aspects, the pull SCI may include an indication of a request for a CAR and / or a BSR. Alternatively or additionally, the indication of the request may specify a multicast ID associated with the transmission. Although example 700 shows that the first UE 701 sends an indication of the request, in other examples, the first UE 701 may avoid sending an indication of the request.

[0100] As indicated by reference numeral 730, the second UE 702 and / or the third UE 703 may send information associated with future transmissions by the respective UEs, and the first UE 701 may receive the information. As an example, the UE (e.g., the second UE 702 and / or the third UE 703) may send an indication of a respective CAR and / or a respective BSR associated with the UE as information associated with future transmissions. For illustration, based at least in part on receiving an SCI-1 indicating a request for information associated with future transmissions (e.g., pulling the SCI), the UE may send a CAR and / or a BSR as an SCI-2 based at least in part on a PSCCH used to receive the SCI-1. As another example, the UE may send a coordination message indicating a recommended resource or a UE-selected resource in an unlicensed spectrum. As an example, the second UE 702 and / or the third UE 703 may select a recommended resource based at least in part on generating a signal metric (e.g., RSRP or RSSI) indicating a channel quality associated with the recommended resource.

[0101] The second UE 702 and / or the third UE 703 may transmit information associated with future transmissions (e.g., coordination messages, CARs, and / or BSRs) based at least in part on the use of the PSFCH and / or PSCCH. In some aspects, the UE (e.g., UE 701, UE 702, and / or UE 703) may determine, at least in part, resources for transmitting (or receiving) the information via the PSFCH and / or PSCCH based at least in part on a groupcast ID associated with a request as shown by reference numeral 720. Alternatively or additionally, the UE may identify resources based at least in part on determining to transmit (or receive) information using a MAC CE and / or transmitting (or receiving) the information as an SCI-2, as further described above. Thus, the UE may transmit or receive information based at least in part on determining and / or identifying resources for transmitting information.

[0102] In some aspects, a UE (e.g., a second UE 702 and / or a third UE 703) may send an indication of information associated with future transmissions as a multicast SCI. Sending an indication of information may include periodically or autonomously sending updated information as a single instance. As an example, the UE may determine to send a single instance of the information based at least in part on identifying that a condition has been met (such as by identifying that the amount of data in a data buffer meets a quantity threshold). As another example, the UE may periodically send the updated information based at least in part on receiving an instruction for periodically sending updated information. Therefore, the UE may send an indication of the information based at least in part on receiving a request for the information and / or autonomously send the indication based at least in part on identifying that a condition has been met. In some aspects, the UE may send an indication of the information based at least in part on determining to join a coordinated access managed at least in part by the first UE 701. Although example 700 shows that the second UE 702 and / or the third UE 703 send information associated with future transmissions, in other examples, the second UE 702 and / or the third UE 703 may avoid sending the information.

[0103] As shown in reference numeral 740, the first UE 701 may determine one or more resource reservations, wherein the resource reservation may indicate the assignment of resources to the UE. As an example, the resource reservation may indicate the assignment of resources associated with the COT structure. In some aspects, the first UE 701 may determine one or more resource reservations based at least in part on (corresponding) information associated with future transmissions received from the second UE 702 and / or the third UE 703. In other aspects, the first UE 701 may determine the one or more resource reservations autonomously and / or independently of receiving information associated with future transmissions. For example, the first UE 701 may autonomously determine resource reservations to preemptively avoid conflicts by identifying each UE operating within a distance threshold to the first UE 701 and assigning resources to each UE and / or instructing one or more UEs to avoid transmitting in the resources.

[0104] In some aspects, as part of determining resource reservation, the first UE 701 may determine and / or identify one or more LBT parameters associated with CAT 4 LBT access. Determining the LBT parameters may include: identifying the corresponding LBT parameters of each participating UE associated with the one or more resource reservations. Some example LBT parameters may include an LBT window (e.g., a contention window) associated with a start time and an end time for clearing LBT, a reserved COT time slot, an ID of another UE participating in coordinated access, and / or an interleaving index associated with reserved resources for participating UEs. As an example, the LBT parameters may indicate (e.g., reserved for UE) a reserved COT, a reserved COT time slot, and / or a reserved COT subband as a reserved resource. In some aspects, a time slot may be a COT time duration (e.g., time duration 504 or time duration 604) or a smaller time division of the COT time duration. Alternatively or additionally, the first UE 701 may randomly select a backoff counter value from a range of values. In some aspects, the range of values ​​used to select the random backoff counter value may be based at least in part on the priority. For example, the first UE 701 may select a first backoff counter value from a first range of values ​​associated with CAPC 0 and a second backoff counter value from a second range of values ​​associated with CAPC 3. Alternatively or additionally, the first UE 701 may modify a start time value and / or an end time value associated with the contention window based at least in part on the service priority. In some aspects, the first UE 701 may indicate a start transmission time based at least in part on the customer premises equipment and / or associated with the customer premises equipment.

[0105] Alternatively or additionally, the LBT parameter may indicate a reserved gap between the end time for clearing the LBT and the transmission in the reserved resources. The "reserved gap" may represent a time period during which no transmission or reception is scheduled and / or allowed to occur. As another example, the LBT parameter may indicate a joint start LBT time (e.g., a start time of contention) for a joint LBT performed by multiple UEs. For illustration, the joint start LBT time may be a global LBT parameter used by all UEs in a group of UEs to define the start of a contention window. Based at least in part on the joint start LBT time, each UE may perform a corresponding LBT process in the same contention window (e.g., joint LBT). Alternatively or additionally, the LBT parameter may indicate a postponement duration associated with the joint LBT, wherein the postponement duration may represent a delay applied to the start LBT time duration. Indicating the joint LBT start time and / or the joint postponement duration may enable a group of UEs to perform a synchronous LBT process and reduce transmission conflicts.

[0106] As part of determining one or more resource reservations, the first UE 701 may determine a group of UEs to be included as participating UEs in the coordinated access. As an example, the first UE 701 may select a UE (e.g., a second UE 702 and / or a third UE 703) to be included in the group based at least in part on receiving an indication of future transmission from the UE. As another example, the first UE 701 may select the UE based at least in part on receiving a scheduling request from the UE. Therefore, the first UE 701 may identify the scheduling request and / or the indication of future transmission as a request to participate in the coordinated access. Alternatively or additionally, the first UE 701 may determine whether to include or exclude a UE from a group of UEs based at least in part on service priority, such as by determining to include a UE with a higher service priority relative to other UEs and / or excluding a UE with a lower service priority relative to other UEs. Including or excluding a UE from a group of UEs based at least in part on service priority can help the first UE 701 first assign COT resources to higher priority transmissions and mitigate transmission failures for higher priority transmissions.

[0107] The first UE 701 may determine resource reservation based at least in part on calculating the number of resources to be reserved in the unlicensed spectrum. As an example, the first UE 701 may calculate the number of resources based at least in part on receiving a CAR and / or a BSR from a UE (e.g., a second UE 702 and / or a third UE 703), and determine the resource reservation based at least in part on the calculated number. In some aspects, the first UE 701 may determine whether the operating location of the UE meets a distance threshold (e.g., the UE operates at a location within the distance threshold to the first UE 701). Based at least in part on whether the operating location meets the distance threshold, the first UE 701 may include or exclude the information (e.g., the CAR and / or the BSR) from the calculation. Excluding information associated with the UE from the calculation may also indicate that the UE has been excluded from a group of UEs associated with coordinated access to the unlicensed spectrum.

[0108] The first UE 701 may select resources to be assigned to the participant UE based at least in part on recommended resources indicated by the participant UE and / or resources selected by the UE. Alternatively or additionally, the first UE 701 may select resources based at least in part on receiving resource reservation information from another coordinator UE. For illustration, the first UE 701 may avoid selecting the assigned resources indicated by another coordinator UE.

[0109] As shown by reference numeral 750, the first UE 701 may send an indication of one or more resource reservations, and the second UE 702 and / or the third UE 703 may receive the indication. In some aspects, the first UE 701 may send an indication of resource reservation as a coordinated access reservation SCI. The coordinated access reservation SCI may include and / or indicate a plurality of coordinated access parameters, wherein these coordinated access parameters may be UE-specific (e.g., associated with a particular UE) and / or global (e.g., associated with all UEs in a group of UEs). Some example coordinated access parameters may include a reserved LBT window, a zone ID associated with the first UE 701 (e.g., acting as a coordinator UE), a coordination range associated with the first UE 701, or a CAPC value associated with a resource reservation capability. The reserved LBT window may be associated with a start time and / or end time of a contention window. The zone ID may indicate an operating area and / or location associated with the first UE 701. The coordination range may indicate the range and / or distance of the participating UEs (eg, from the first UE 70) that the first UE 701 supports coordinated access. The maximum CAPC value may indicate the highest CAPC supported and / or prioritized by the first UE 701.

[0110] In some aspects, the coordinated access reservation SCI may indicate a group of UEs (e.g., a group of UEs selected by the first UE 701) that are eligible to participate in coordinated access to the unlicensed spectrum. The coordinated access reservation SCI may alternatively or additionally indicate a resource reservation for each UE in a group of UEs. For illustration, a UE-specific resource reservation may indicate an interlace index assigned to the UE, one or more subbands assigned to the UE, and / or an ID of the UE. For example, an interlace may be divided into a plurality of subbands, and the resource reservation may indicate one or more subbands of the subbands of the interlace. Alternatively or additionally, an interlace may be divided into a plurality of frequency partitions, and the resource reservation may indicate one or more frequency partitions of the frequency partitions. In some aspects, the coordinated access reservation SCI may indicate a UE-specific backoff value, which may be based at least in part on a CAPC value associated with future transmissions by the UE.

[0111] The first UE 701 may implicitly indicate to a non-participating UE and include it as part of a coordinated access reservation SCI to avoid sending in resources associated with resource reservation. For example, the first UE 701 may send a coordinated access reservation SCI as a broadcast and / or multicast message that any UE within the reception range can receive and recover. "Any UE" may include a non-participating UE, where "non-participating UE" may represent a UE excluded from a group of UEs and / or a UE that has been determined to avoid joining the coordinated access. In some aspects, "any UE" may include another coordinator UE that manages the same cluster as the first UE 701 or a different cluster (with a different group of UEs). Therefore, the first coordinator UE may communicate resource reservation and / or coordinated access reservation SCI to the second coordinator UE. The coordinated access reservation SCI may indicate the resources assigned by the first UE 701 to the non-participating UE and / or another coordinator UE, and implicitly indicate to avoid sending in the assigned resources and / or avoid assigning the resources.

[0112] As shown by reference numeral 760, the first UE 701, the second UE 702, and / or the third UE 703 may send one or more sidelink communications based at least in part on the resource reservation shown by reference numeral 750. For example, the first UE 701 may send a first sidelink communication based at least in part on a resource reservation associated with the first UE 701, the second UE 702 may send a second sidelink communication based at least in part on a resource reservation associated with the second UE 702, and / or the third UE 703 may send a third sidelink communication based at least in part on a resource reservation associated with the third UE 703.

[0113] In some aspects, a UE (e.g., the second UE 702 and / or the third UE 703) may determine to avoid participating in coordinated access. Avoiding participation may include avoiding sending sidelink communications using resources based at least in part on resource reservations (and / or other configuration parameters indicated by coordinated access reservation SCI) shown by reference numeral 750. For illustration, the UE may determine whether to participate in coordinated access to an unlicensed spectrum based at least in part on the coordinated access reservation SCI. For example, the UE may determine that a start time associated with a reserved LBT window indicated by the coordinated access reservation SCI fails to meet a packet delay budget associated with the UE. Based at least in part on the failure of the start time to meet the packet delay budget, the UE may determine to avoid participating in coordinated access. Other examples that may cause the UE to avoid participation may include: the UE determines that a zone identifier associated with the coordinator UE indicates that the operating location of the coordinator UE fails to meet a distance threshold associated with the UE, a coordination range associated with the coordinator UE fails to meet a range threshold associated with the UE, and / or a maximum CAPC value fails to meet a service CAPC threshold associated with the UE.

[0114] As shown by reference numeral 770, the first UE 701, the second UE 702, and / or the third UE 703 may iteratively perform some or all of the signaling and / or actions shown in example 700, such as requesting information associated with future transmission, sending information associated with future transmission, determining updated resource reservation, sending updated coordinated access reservation SCI, and / or sending any combination of side link communications based at least in part on the updated coordinated access reservation SCI. As an example of an updated coordinated access reservation SCI, the first UE 701 may update the contention window value (e.g., start time value and / or end time value) based at least in part on the modified link and / or observed link associated with the contention window (e.g., based at least in part on the modified CAPC value) and / or the UE associated with the contention window. Although example 700 shows an iteration returned at reference numeral 720, other example iterations may be returned at other signaling and / or transactions shown in example 700.

[0115] As shown by reference numeral 780, the first UE 701 may stop acting as a coordinator UE. As an example, the first UE 701 may stop acting as a coordinator UE based at least in part on receiving an instruction from a network entity (e.g., base station 110) specifying to stop acting as a coordinator UE. As another example, the first UE 701 may repeatedly send a coordinated access reservation SCI within a time duration while failing to receive a CAR and / or a BSR from the UE. For illustration, the first UE 701 may repeatedly send the request shown by reference numeral 720 during the time duration, and fail to receive the information shown by reference numeral 730 during the time duration. Alternatively or additionally, while (only) receiving a BSR indicating an empty data buffer during the time duration, the first UE 701 may repeatedly send the coordinated access reservation SCI shown by reference numeral 750 during the time duration. At the expiration of the time duration, the first UE 701 may determine to stop sending the coordinated access reservation SCI and / or stop acting as a coordinator UE.

[0116] By coordinating LBT channel access to unlicensed spectrum, the coordinating UE can mitigate other UEs operating within a distance threshold of each other from selecting the same resources (e.g., interlaces associated with COT) and mitigate transmission conflicts, such as conflicts in sidelink communications. Mitigating transmission conflicts can improve sidelink communications by reducing recovery failures and / or errors at the receiver, increasing data throughput, and / or reducing resource consumption.

[0117] As indicated above, Figure 7 are provided as examples. Other examples can be found in the Figure 7 Different than described.

[0118] Figure 8 is a diagram illustrating an example process 800 performed, for example, by a UE in accordance with the present disclosure. Example process 800 is an example in which a UE (eg, UE 120) performs operations associated with coordinated access to unlicensed spectrum.

[0119] like Figure 8 As shown, in some aspects, process 800 may include sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with a resource in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum (block 810). For example, as described above, a UE (e.g., using Fig.10 The communication manager 140 and / or sending component 1004 depicted in the figure may send an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least LBT parameters associated with a channel access procedure (e.g., LBT access) for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum.

[0120] like Figure 8 As further shown, in some aspects, process 800 may include: communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index (block 820). For example, as described above, a UE (e.g., using Fig.10 The communication manager 140, the sending component 1004 and / or the receiving component 1002 depicted in the figure can communicate in the wireless network based at least in part on the resource reservation, the LBT parameter and the interleaving index associated with the unlicensed spectrum.

[0121] Process 800 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.

[0122] In a first aspect, the UE is a coordinator UE, and the process 800 includes receiving a coordination message from a participant UE indicating recommended resources in an unlicensed spectrum.

[0123] In a second aspect, either alone or in combination with the first aspect, the coordination message indicates a start time associated with the recommended resource.

[0124] In a third aspect, alone or in combination with one or more of the first and second aspects, communicating in the wireless network may include communicating in the wireless network based at least in part on the recommended resource.

[0125] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the resource reservation associated with the unlicensed spectrum is based at least in part on the recommended resource.

[0126] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, sending the indication may include: sending the indication based at least in part on a coordinated access reservation SCI.

[0127] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the UE is a coordinator UE, and process 800 includes: assigning resources in the unlicensed spectrum to the participant UE. In some aspects, the resource reservation indicates the resource.

[0128] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the resource is associated with a channel occupancy time structure.

[0129] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the UE is a coordinator UE, the indication of the resource reservation is a first indication, and the process 800 includes: receiving a second indication from the participant UE, the second indication specifying at least one of a CAR or a buffer status report; and calculating the amount of resources to be reserved in the unlicensed spectrum based at least in part on the second indication. In some aspects, the resource reservation is based at least in part on the calculated amount of resources.

[0130] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, receiving the second indication may include: recovering the CAR or the BSR from the multicast SCI.

[0131] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, receiving the second indication may include: periodically receiving the second indication; or receiving the second indication based at least in part on satisfying a condition.

[0132] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, receiving the second indication may include: receiving the second indication based at least in part on a physical side link feedback channel or a physical side link shared channel.

[0133] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, process 800 includes: determining a reception resource based at least in part on a multicast identifier, a MAC CE, or a second level sidelink control information. In some aspects, receiving the second indication may include: receiving the second indication based at least in part on the reception resource.

[0134] In a thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, process 800 includes calculating the amount of resources to be reserved in the unlicensed spectrum based at least in part on the location of the participant UE satisfying a distance threshold.

[0135] In a fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, receiving the second indication may include receiving the second indication based at least in part on receiving a scheduling request.

[0136] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, process 800 includes: determining a group of UEs based at least in part on receiving the second indication from the participant UE. In some aspects, the group of UEs includes the participant UE, and sending the first indication includes: sending the first indication to each UE in the group of UEs.

[0137] In a sixteenth aspect, either alone or in combination with one or more of aspects one to fifteen, process 800 includes determining to include the participant UE in the group of UEs based at least in part on identifying the second indication as a request to participate in the coordinated access to the unlicensed spectrum.

[0138] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, determining the group of UEs may include: determining the group of UEs based at least in part on service priorities.

[0139] In an eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, process 800 includes: sending a coordinated access reservation SCI based at least in part on the second indication as the first indication.

[0140] In the nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, the coordinated access reservation SCI may include at least one of the following: a reserved LBT window; a zone identifier associated with the coordinator UE; a coordination range associated with the coordinator UE; or a maximum channel access priority level value associated with the resource reservation capability.

[0141] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, the LBT parameters may include at least one of: an LBT window associated with a start time and an end time for clearing the LBT; a reserved channel occupancy time slot; an identifier of a participant UE associated with the coordinated access to the unlicensed spectrum; or an interleaving index associated with reserved resources for the participant UE.

[0142] In aspect 21, alone or in combination with one or more of aspects 1 to 20, the LBT parameters may include at least one of the following: a reserved gap between the end time for clearing the LBT and the transmission in the reserved resources; or a joint start LBT time for joint LBT performed by multiple UEs.

[0143] In a twenty-second aspect, either alone or in combination with one or more of aspects one to twenty-first, the LBT parameters may include at least one of: a backoff counter value; a start transmission time associated with customer premises equipment; or a deferral duration associated with joint LBT.

[0144] In a twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the indication further indicates a set of UEs eligible to participate in the coordinated access to the unlicensed spectrum.

[0145] In aspect twenty-four, either alone or in combination with one or more of aspects one to twenty-third, the indication of the resource reservation further indicates, for each UE in a group of UEs participating in the coordinated access to the unlicensed spectrum, at least one of: an interleaving index assigned to the UE in the group; one or more subbands assigned to the UE in the group; or an identifier of the UE in the group.

[0146] In a twenty-fifth aspect, alone or in combination with one or more of the first to twenty-fourth aspects, process 800 includes: instructing a non-participating UE to avoid transmitting in resources associated with the resource reservation.

[0147] In a twenty-sixth aspect, alone or in combination with one or more of the first to twenty-fifth aspects, the process 800 includes: receiving an instruction from a network entity for the following operation: acting as a coordinator UE for the coordinated access to the unlicensed spectrum.

[0148] In the twenty-seventh aspect, alone or in combination with one or more of aspects one to twenty-six, process 800 includes: before sending the indication of the resource reservation associated with the unlicensed spectrum, failing to receive a valid coordinated access reservation SCI from a number of coordinator UEs satisfying a counting threshold; and determining, at least in part based on the number failing to satisfy the counting threshold, to act as a coordinator UE for coordinated access to the unlicensed spectrum.

[0149] In the twenty-eighth aspect, alone or in combination with one or more of the first to twenty-seventh aspects, determining to act as the coordinator UE may include: determining to act as one of the multiple coordinator UEs for a group of UEs participating in a cluster for coordinated access to the unlicensed spectrum.

[0150] In a twenty-ninth aspect, either alone or in combination with one or more of the first to twenty-eighth aspects, process 800 includes identifying a valid coordinated access reservation SCI based at least in part on a distance threshold.

[0151] In a thirtieth aspect, alone or in combination with one or more of the first to twenty-ninth aspects, the process 800 includes: selecting a random backoff counter value from a range of values. In some aspects, the range of values ​​is based at least in part on a priority. Alternatively or additionally, the process 800 may include: signaling the random backoff counter value in a coordinated access reservation SCI.

[0152] In the thirty-first aspect, alone or in combination with one or more of the first to thirtieth aspects, the process 800 includes: receiving a CAR or a BSR from the participating UE; and repeatedly sending a coordinated access reservation SCI based at least in part on the reception.

[0153] In a thirty-second aspect, alone or in combination with one or more of the first to thirty-first aspects, process 800 includes: receiving a corresponding CAR or a corresponding buffer status report from one or more UEs in a group of participant UEs associated with the coordinated access to the unlicensed spectrum. In some aspects, the group of participant UEs includes the participant UE, and process 800 includes: iteratively sending a coordinated access reservation SCI. For each iteration, the coordinated access reservation SCI may be based at least in part on at least one of the corresponding CAR or the corresponding buffer status report.

[0154] In aspect thirty-third, alone or in combination with one or more of aspects one to thirty-second, process 800 includes: repeatedly sending a coordinated access reservation SCI within a time period based at least in part on an empty data buffer associated with a failure to receive a CAR or a buffer status report; and stopping sending the coordinated access reservation SCI when the time period expires.

[0155] In a thirty-fourth aspect, alone or in combination with one or more of the first to thirty-third aspects, the process 800 includes: ceasing to act as the coordinating UE when the time duration expires.

[0156] In aspect thirty-fifth, alone or in combination with one or more of aspects one to thirty-fourth, process 800 includes: maintaining a contention window value based at least in part on the UE acting as the coordinator; and updating the contention window value based at least in part on an observed link associated with the contention window, the contention window being at least in part based on the contention window value.

[0157] although Figure 8Example blocks of process 800 are shown, but in some aspects, process 800 may include Figure 8 The blocks depicted in the process 800 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 800. Additionally or alternatively, two or more of the blocks in the process 800 may be executed in parallel.

[0158] Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a UE in accordance with the present disclosure. Example process 900 is an example in which a UE (eg, UE 120) performs operations associated with coordinated access to unlicensed spectrum.

[0159] like Fig. 9 As shown, in some aspects, process 900 may include receiving an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interlace index associated with resources in the unlicensed spectrum assigned to the UE, the indication associated with coordinated access to the unlicensed spectrum (block 910). As an example, the channel access procedure may be a CAT 4 access procedure.

[0160] like Fig. 9 As further shown, in some aspects, process 900 may include: communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index (block 920). For example, as described above, a UE (e.g., using Fig.10 The communication manager 140, the sending component 1004 and / or the receiving component 1002 depicted in the figure can communicate in the wireless network based at least in part on the resource reservation, the LBT parameter and the interleaving index associated with the unlicensed spectrum.

[0161] Process 900 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.

[0162] In a first aspect, the UE is a participant UE associated with the coordinated access to the unlicensed spectrum, and process 900 includes sending a coordination message indicating recommended resources in the unlicensed spectrum.

[0163] In a second aspect, either alone or in combination with the first aspect, the coordination message indicates a start time associated with the recommended resource.

[0164] In a third aspect, alone or in combination with one or more of the first and second aspects, communicating in the wireless network may include communicating in the wireless network based at least in part on the recommended resource.

[0165] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the resource reservation associated with the unlicensed spectrum is based at least in part on the recommended resource.

[0166] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, receiving the indication may include: sending the indication based at least in part on a coordinated access reservation SCI.

[0167] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the UE is a participant UE associated with the coordinated access to the unlicensed spectrum, and process 900 includes: receiving assigned resources associated with the unlicensed spectrum from the coordinator UE associated with the coordinated access to the unlicensed spectrum. In some aspects, the resource reservation indicates the assigned resources.

[0168] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the resource is associated with a channel occupancy time structure.

[0169] In an eighth aspect, either alone or in combination with one or more of aspects one to seven, the UE is a participant UE associated with the coordinated access to the unlicensed spectrum, the indication of the resource reservation is a first indication, and process 900 includes sending a second indication specifying at least one of a CAR or a buffer status report.

[0170] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, sending the second indication may include: sending the CAR or the BSR based at least in part on a multicast SCI.

[0171] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, sending the second indication may include: periodically sending the second indication.

[0172] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, sending the second indication may include: sending the second indication based at least in part on a physical side link feedback channel or a physical side link shared channel.

[0173] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, process 900 includes: determining a transmission resource based at least in part on a multicast identifier, a MAC CE, or second-level sidelink control information. In some aspects, sending the second may include: sending the second indication based at least in part on the transmission resource.

[0174] In a thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, sending the second indication may include sending the second indication based at least in part on sending a scheduling request.

[0175] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 900 includes: receiving a coordinated access reservation SCI based at least in part on the second indication as the first indication.

[0176] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the coordinated access reservation SCI may include at least one of the following: a reserved LBT window; a zone identifier associated with the coordinator UE; a coordination range associated with the coordinator UE; or a maximum channel access priority level value associated with the resource reservation capability.

[0177] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, process 900 includes determining whether to participate in the coordinated access to the unlicensed spectrum based at least in part on the coordinated access reservation SCI.

[0178] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, process 900 includes: determining to avoid participating in the coordinated access to the unlicensed spectrum. In some aspects, communicating in the wireless network may include: avoiding transmitting in the wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0179] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, determining to avoid participating in the coordinated access may include: determining to avoid participating in the coordinated access based at least in part on one of the following: the start time associated with the reserved LBT window that fails to meet the packet delay budget associated with the UE; the zone identifier indicating that the coordinator UE is located at a position that fails to meet the distance threshold; the coordination range associated with the coordinator UE that fails to meet the range threshold; or the maximum channel access priority level value that fails to meet the service channel access priority level threshold.

[0180] In a nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, process 900 includes: determining to join the coordinated access to the unlicensed spectrum; and sending a CAR based at least in part on the determination.

[0181] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, the LBT parameters may include at least one of: an LBT window associated with a start time and an end time for clearing the LBT; a reserved channel occupied time slot; an identifier of the UE; or an interleaving index associated with reserved resources for the UE.

[0182] In aspect 21, alone or in combination with one or more of aspects 1 to 20, the LBT parameters may include at least one of the following: a reserved gap between the end time for clearing the LBT and the transmission in the reserved resources; or a joint start LBT time for joint LBT performed by multiple UEs.

[0183] In a twenty-second aspect, either alone or in combination with one or more of aspects one to twenty-first, the LBT parameters may include at least one of: a backoff counter value; a start transmission time associated with customer premises equipment; or a deferral duration associated with joint LBT.

[0184] In a twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the indication further indicates a set of UEs eligible to participate in the coordinated access to the unlicensed spectrum.

[0185] In aspect twenty-four, either alone or in combination with one or more of aspects one to twenty-third, the indication of the resource reservation further indicates, for each UE in a group of UEs participating in the coordinated access to the unlicensed spectrum, at least one of: an interleaving index assigned to the UE in the group; one or more subbands assigned to the UE in the group; or an identifier of the UE in the group.

[0186] although Fig. 9 Example blocks of process 900 are shown, but in some aspects, process 900 may include Fig. 9 The blocks depicted in the process 900 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 900. Additionally or alternatively, two or more of the blocks in the process 900 may be executed in parallel.

[0187] Fig.101 is a diagram of an example apparatus 1000 for wireless communication according to the present disclosure. Apparatus 1000 may be a UE, or a UE may include apparatus 1000. In some aspects, apparatus 1000 includes a receiving component 1002 and a transmitting component 1004 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1000 may communicate with another apparatus 1006 (such as a UE, a base station, or another wireless communication device) using receiving component 1002 and transmitting component 1004. As further shown, apparatus 1000 may include a communication manager 140. Communication manager 140 may include one or more of a coordination access manager component 1008, etc.

[0188] In some aspects, the apparatus 1000 may be configured to perform Figures 3 to 9 Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as Figure 8 Process 800, Fig. 9 In some aspects, Fig.10 The apparatus 1000 and / or one or more components shown in FIG. 1 may include a combination of Figure 2 Additionally or alternatively, Fig.10 One or more of the components shown in the figure may be combined with Figure 2 Additionally or alternatively, one or more components in a set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0189] The receiving component 1002 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the apparatus 1006. The receiving component 1002 may provide the received communications to one or more other components of the apparatus 1000. In some aspects, the receiving component 1002 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 apparatus 1000. In some aspects, the receiving component 1002 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.

[0190] The transmitting component 1004 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the apparatus 1006. In some aspects, one or more other components of the apparatus 1000 may generate communications and may provide the generated communications to the transmitting component 1004 for transmission to the apparatus 1006. In some aspects, the transmitting component 1004 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 apparatus 1006. In some aspects, the transmitting component 1004 may include a combination of 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 1004 can be co-located with the receive component 1002 in a transceiver.

[0191] The transmitting component 1004 may transmit an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum. As an example, the channel access procedure may be a CAT 4 access procedure. The coordinated access manager component 1008 may manage the resource reservation and enable the apparatus 1000 to communicate in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0192] The coordinated access manager component 1008 may determine the receiving resources based at least in part on the multicast identifier, the MAC CE, or the SCI-2. Alternatively or additionally, the coordinated access manager component 1008 may calculate the amount of the resources to be reserved in the unlicensed spectrum based at least in part on the location of the participant UE satisfying the distance threshold. In some aspects, the coordinated access manager component 1008 may determine a group of UEs based at least in part on receiving the second indication from the participant UE, and the group of UEs may include the participant UE. The coordinated access manager component 1008 may determine to include the participant UE in the group of UEs based at least in part on identifying the second indication as a request to participate in the coordinated access to the unlicensed spectrum.

[0193] The transmitting component 1004 can transmit a coordinated access reservation SCI based at least in part on the second indication as the first indication. The transmitting component 1004 can transmit the first indication to each UE in the group of UEs based at least in part on instructions from the coordinated access manager component 1008.

[0194] Coordinated access manager component 1008 can instruct non-participating UEs to avoid transmitting in resources associated with the resource reservation.In some aspects, coordinated access manager component 1008 can receive instructions from a network entity via receiving component 1002 to act as a coordinator UE for the coordinated access to the unlicensed spectrum.

[0195] Coordinated access manager component 1008 may fail to receive a valid coordinated access reservation SCI from a number of coordinator UEs satisfying a counting threshold via receiving component 1002 prior to sending the indication of the resource reservation associated with the unlicensed spectrum. In some aspects, coordinated access manager component 1008 may determine to act as a coordinator UE for coordinated access to the unlicensed spectrum based at least in part on the number failing to satisfy the counting threshold.

[0196] Coordinated access manager component 1008 can identify a valid coordinated access reservation SCI based at least in part on the distance threshold. Alternatively or additionally, coordinated access manager component 1008 can select a random backoff counter value from a range of values. In some aspects, the range of values ​​can be based at least in part on a priority. Coordinated access manager component 1008, via sending component 1004, can signal the random backoff counter value in the coordinated access reservation SCI.

[0197] Coordinated access manager component 1008 can receive the CAR or BSR from the participant UE via receiving component 1002. In some aspects, coordinated access manager component 1008 can repeatedly transmit the coordinated access reservation SCI via transmitting component 1004 based at least in part on the receiving.

[0198] The coordinated access manager component 1008 can receive, via the receiving component 1002, a corresponding CAR or a corresponding BSR from one or more UEs in a group of participant UEs associated with the coordinated access to the unlicensed spectrum, wherein the group of participant UEs includes the participant UE.

[0199] Coordinated access manager component 1008 can iteratively send the coordinated access reservation SCI via sending component 1004. For each iteration, the coordinated access reservation SCI can be based at least in part on at least one of the corresponding CAR or the corresponding BSR.

[0200] The coordinated access manager component 1008 may repeatedly send the coordinated access reservation SCI within the time duration through the sending component 1004 based at least in part on the empty data buffer associated with the failure to receive the CAR or BSR. The coordinated access manager component 1008 may stop sending the coordinated access reservation SCI when the time duration expires. Alternatively or additionally, the coordinated access manager component 1008 may stop acting as the coordinator UE when the time duration expires.

[0201] Coordinated access manager component 1008 can maintain a contention window value based at least in part on acting as the coordinator UE. In some aspects, coordinated access manager component 1008 can update the contention window value based at least in part on an observed link associated with a contention window, the contention window being based at least in part on the contention window value.

[0202] The receiving component 1002 may send an indication of a resource reservation associated with an unlicensed spectrum, wherein the indication specifies at least an LBT parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE. As an example, the channel access procedure may be a CAT 4 access procedure. The indication may be associated with coordinated access to the unlicensed spectrum in which the UE is participating. The coordinated access manager component 1008 may communicate in a wireless network via the receiving component 1002 and / or the sending component 1004 based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0203] Coordinated access manager component 1008 can determine transmit resources based at least in part on a multicast identifier, a MAC CE, or a SCI-2.

[0204] In some aspects, the coordinated access manager component 1008 may receive, via the receiving component 1002, a coordinated access reservation SCI based at least in part on the second indication as the first indication. The coordinated access manager component 1008 may determine whether to participate in the coordinated access to the unlicensed spectrum based at least in part on the coordinated access reservation SCI. As an example, the coordinated access manager component 1008 may determine to avoid participating in the coordinated access to the unlicensed spectrum. Communicating in the wireless network by avoiding participation may include avoiding transmitting in the wireless network based at least in part on the resource reservation, the LBT parameter, and the interleaving index associated with the unlicensed spectrum. Alternatively or additionally, the coordinated access manager component 1008 may determine to join the coordinated access to the unlicensed spectrum. In some aspects, the coordinated access manager component 1008 may send a CAR via the sending component 1004 based at least in part on the determination.

[0205] Fig.10 The number and arrangement of components shown in the diagram are provided as examples. In practice, there may be Fig.10 The components shown in the figure may include additional components, fewer components, different components, or components arranged in a different manner. Fig.10 Two or more components shown in may be implemented in a single component, or Fig.10The single component shown in may be implemented as multiple distributed components. Additionally or alternatively, Fig.10 A set (one or more) of components shown in the figure may perform the operations described as being performed by Fig.10 One or more functions performed by another set of components shown in FIG.

[0206] The following provides an overview of some aspects of the disclosure:

[0207] Aspect 1: A method for wireless communication performed by a user equipment (UE), the method comprising: sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with a channel access process for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participating UE, the participating UE being associated with coordinated access to the unlicensed spectrum; and communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0208] Aspect 2: The method according to aspect 1, wherein the UE is a coordinator UE, and the method further comprises: receiving a coordination message indicating recommended resources in the unlicensed spectrum from the participant UE.

[0209] Aspect 3: The method according to aspect 2, wherein the coordination message indicates a start time associated with the recommended resource.

[0210] Aspect 4: The method according to aspect 2 or aspect 3, wherein communicating in the wireless network includes: communicating in the wireless network based at least in part on the recommended resources.

[0211] Aspect 5: The method according to any one of aspects 2 to 4, wherein the resource reservation associated with the unlicensed spectrum is based at least in part on the recommended resources.

[0212] Aspect 6: The method according to any one of aspects 1 to 5, wherein sending the indication further comprises: sending the indication based at least in part on coordinated access reservation sidelink control information.

[0213] Aspect 7: The method according to any one of Aspects 1 to 6, wherein the UE is a coordinator UE, and the method further comprises: assigning resources in the unlicensed spectrum to the participant UE, wherein the resource reservation indicates the resources.

[0214] Aspect 8: The method according to aspect 7, wherein the resource is associated with a channel occupancy time structure.

[0215] Aspect 9: A method according to any one of Aspects 1 to 8, wherein the UE is a coordinating UE, the indication of the resource reservation is a first indication, and the method further includes: receiving a second indication from the participating UE, the second indication specifying at least one of the following: a channel access request or a buffer status report; and calculating the amount of resources to be reserved in the unlicensed spectrum based at least in part on the second indication, wherein the resource reservation is based at least in part on the calculated amount of resources.

[0216] Aspect 10: The method according to Aspect 9, wherein receiving the second indication further comprises: recovering the channel access request or the buffer status report from multicast side link control information.

[0217] Aspect 11: The method according to aspect 10, wherein receiving the second indication further comprises: periodically receiving the second indication; or receiving the second indication based at least in part on satisfying a condition.

[0218] Aspect 12: The method according to aspect 10 or aspect 11, wherein receiving the second indication further comprises: receiving the second indication based at least in part on: a physical sidelink feedback channel; or a physical sidelink shared channel.

[0219] Aspect 13: The method according to aspect 12, the method further comprising: determining a reception resource based at least in part on: a multicast identifier; a medium access control (MAC) control element (CE); or second-level sidelink control information, and wherein receiving the second indication further comprises: receiving the second indication based at least in part on the reception resource. Wherein receiving the second indication further comprises: receiving the second indication based at least in part on the reception resource.

[0220] Aspect 14: According to any one of aspects 9 to 13, the method further includes: calculating the amount of resources to be reserved in the unlicensed spectrum based at least in part on the location of the participating UE satisfying a distance threshold.

[0221] Aspect 15: The method according to any one of aspects 9 to 14, wherein receiving the second indication further comprises: receiving the second indication based at least in part on receiving a scheduling request.

[0222] Aspect 16: According to the method described in any one of Aspects 9 to 15, the method also includes: determining a group of UEs based at least in part on receiving the second indication from the participating UE, wherein the group of UEs includes the participating UE, and wherein sending the first indication also includes: sending the first indication to each UE in the group of UEs.

[0223] Aspect 17: The method according to Aspect 16 further includes: determining to include the participant UE in the group of UEs based at least in part on identifying the second indication as a request to participate in the coordinated access to the unlicensed spectrum.

[0224] Aspect 18: The method according to aspect 16 or aspect 17, wherein determining the group of UEs further comprises: determining the group of UEs based at least in part on traffic priority.

[0225] Aspect 19: According to the method according to any one of Aspects 9 to 18, the method also includes: sending coordinated access reservation side link control information based at least in part on the second indication as the first indication.

[0226] Aspect 20: A method according to Aspect 19, wherein the coordinated access reservation side link control information includes at least one of the following: a reserved LBT window; a zone identifier associated with the coordinator UE; a coordination range associated with the coordinator UE; or a maximum channel access priority level value associated with the resource reservation capability.

[0227] Aspect 21: A method according to any one of Aspects 1 to 20, wherein the LBT parameters include at least one of the following: an LBT window associated with a start time and an end time for clearing LBT; a reserved channel occupancy time slot; an identifier of a participating UE associated with the coordinated access to the unlicensed spectrum; or an interleaving index associated with reserved resources for the participating UE.

[0228] Aspect 22: A method according to Aspect 21, wherein the LBT parameters also include at least one of the following: a reserved gap between the end time for clearing the LBT and the transmission in the reserved resources; or a joint start LBT time for joint LBT performed by multiple UEs.

[0229] Aspect 23: The method according to aspect 21 or aspect 22, wherein the LBT parameters further include at least one of: a backoff counter value; a start transmission time associated with the customer premises equipment; or a deferral duration associated with the joint LBT.

[0230] Aspect 24: The method according to any one of aspects 1 to 23, wherein the indication further indicates a set of UEs eligible to participate in the coordinated access to the unlicensed spectrum.

[0231] Aspect 25: A method according to any one of Aspects 1 to 24, wherein the indication of the resource reservation further indicates at least one of the following for each UE in a group of UEs participating in the coordinated access to the unlicensed spectrum: an interleaving index assigned to the UE in the group; one or more subbands assigned to the UE in the group; or an identifier of the UE in the group.

[0232] Aspect 26: According to the method according to any one of aspects 1 to 25, the method further comprises: instructing a non-participating UE to avoid transmitting in the resources associated with the resource reservation.

[0233] Aspect 27: The method according to any one of aspects 1 to 26, the method further comprising: receiving an instruction from a network entity to act as a coordinator UE for the coordinated access to the unlicensed spectrum.

[0234] Aspect 28: According to any one of Aspects 1 to 27, the method further includes: before sending the indication of the resource reservation associated with the unlicensed spectrum, failing to receive valid coordinated access reservation side link control information from a number of coordinator UEs that satisfy a counting threshold; and determining, at least in part based on the failure of the number to satisfy the counting threshold, to act as a coordinator UE for coordinated access to the unlicensed spectrum.

[0235] Aspect 29: The method according to aspect 28, wherein determining to serve as the coordinator UE comprises: determining to serve as one coordinator UE among a plurality of coordinator UEs for a group of UEs participating in a cluster for coordinated access to the unlicensed spectrum.

[0236] Aspect 30: The method according to aspect 28 or aspect 29, the method further comprising: identifying valid coordinated access reservation sidelink control information based at least in part on a distance threshold.

[0237] Aspect 31: According to any one of Aspects 28 to 30, the method further includes: selecting a random backoff counter value from a value range, wherein the value range is at least partially based on the priority; and signaling the random backoff counter value in the coordinated access reservation side link control information.

[0238] Aspect 32: According to the method described in any one of Aspects 28 to 31, the method further includes: receiving a channel access request or a buffer status report from the participating UE; and repeatedly sending coordinated access reservation side link control information based at least in part on the reception.

[0239] Aspect 33: According to the method described in any one of Aspects 28 to 32, the method further includes: receiving a corresponding channel access request or a corresponding buffer status report from one or more UEs in a group of participating UEs associated with the coordinated access to the unlicensed spectrum, wherein the group of participating UEs includes the participating UE; and iteratively sending coordinated access reservation side link control information, wherein for each iteration, the coordinated access reservation side link control information is at least partially based on at least one of the corresponding channel access request or the corresponding buffer status report.

[0240] Aspect 34: According to the method described in any one of Aspects 28 to 33, the method also includes: repeatedly sending coordinated access reservation side link control information within a time period based at least in part on an empty data buffer associated with a failure to receive a channel access request or a buffer status report; and stopping sending the coordinated access reservation side link control information when the time period expires.

[0241] Aspect 35: The method according to aspect 34, further comprising: ceasing to act as the coordinating UE when the time duration expires.

[0242] Aspect 36: According to the method described in any one of Aspects 28 to 35, the method also includes: maintaining a contention window value based at least in part on acting as the coordinating UE; and updating the contention window value based at least in part on an observed link associated with the contention window, the contention window being at least in part based on the contention window value.

[0243] Aspect 37: A method for wireless communication performed by a user equipment (UE), the method comprising: receiving an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with a channel access process for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum; and communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameter, and the interleaving index.

[0244] Aspect 38: A method according to aspect 37, wherein the UE is a participant UE associated with the coordinated access to the unlicensed spectrum, and the method further includes: sending a coordination message indicating recommended resources in the unlicensed spectrum.

[0245] Aspect 39: The method according to Aspect 38, wherein the coordination message indicates a start time associated with the recommended resource.

[0246] Aspect 40: The method according to aspect 38 or aspect 39, wherein communicating in the wireless network includes: communicating in the wireless network based at least in part on the recommended resources.

[0247] Aspect 41: The method according to any one of aspects 38 to 40, wherein the resource reservation associated with the unlicensed spectrum is based at least in part on the recommended resources.

[0248] Aspect 42: The method according to any one of aspects 37 to 41, wherein receiving the indication further comprises: sending the indication based at least in part on coordinated access reservation sidelink control information.

[0249] Aspect 43: A method according to any one of Aspects 37 to 42, wherein the UE is a participant UE associated with the coordinated access to the unlicensed spectrum, and the method further includes: receiving assigned resources associated with the unlicensed spectrum from a coordinator UE associated with the coordinated access to the unlicensed spectrum, wherein the resource reservation indicates the assigned resources.

[0250] Aspect 44: The method according to aspect 43, wherein the resource is associated with a channel occupancy time structure.

[0251] Aspect 45: A method according to any one of Aspects 37 to 44, wherein the UE is a participant UE associated with the coordinated access to the unlicensed spectrum, the indication of the resource reservation is a first indication, and the method further includes: sending a second indication, the second indication specifying at least one of the following: a channel access request or a buffer status report.

[0252] Aspect 46: The method according to Aspect 45, wherein sending the second indication further comprises: sending the channel access request or the buffer status report based at least in part on multicast side link control information.

[0253] Aspect 47: The method according to Aspect 45 or Aspect 46, wherein sending the second indication further comprises: sending the second indication periodically.

[0254] Aspect 48: A method according to any one of Aspects 45 to 47, wherein sending the second indication further comprises: sending the second indication based at least in part on: a physical sidelink feedback channel; or a physical sidelink shared channel.

[0255] Aspect 49: According to the method described in any one of Aspects 45 to 48, the method also includes: determining the sending resources based at least in part on: a multicast identifier; a medium access control (MAC) control element (CE); or a second-level sidelink control information, wherein sending the second indication also includes: sending the second indication based at least in part on the sending resources, wherein sending the second indication also includes: sending the second indication based at least in part on the sending resources.

[0256] Aspect 50: The method according to aspect 45, wherein sending the second indication further comprises: sending the second indication based at least in part on sending a scheduling request.

[0257] Aspect 51: According to the method according to any one of Aspects 45 to 50, the method also includes: receiving coordinated access reservation sidelink control information based at least in part on the second indication as the first indication.

[0258] Aspect 52: A method according to Aspect 51, wherein the coordinated access reservation side link control information includes at least one of the following: a reserved LBT window; a zone identifier associated with the coordinator UE; a coordination range associated with the coordinator UE; or a maximum channel access priority level value associated with the resource reservation capability.

[0259] Aspect 53: According to the method according to Aspect 51 or Aspect 52, the method also includes: determining whether to participate in the coordinated access to the unlicensed spectrum based at least in part on the coordinated access reservation sidelink control information.

[0260] Aspect 54: According to the method described in Aspect 53, the method also includes: determining to avoid participating in the coordinated access to the unlicensed spectrum, wherein communicating in the wireless network also includes: avoiding transmitting in the wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters and the interleaving index.

[0261] Aspect 55: A method according to Aspect 54, wherein determining to avoid participating in the coordinated access further comprises: determining to avoid participating in the coordinated access based at least in part on one of: a start time associated with the reserved LBT window that fails to meet a packet delay budget associated with the UE; the zone identifier indicating that the coordinator UE is located at a position that fails to meet a distance threshold; the coordination range associated with the coordinator UE that fails to meet a range threshold; or the maximum channel access priority level value that fails to meet a service channel access priority level threshold.

[0262] Aspect 56: The method according to any one of aspects 37 to 53, the method also comprising: determining to join the coordinated access to the unlicensed spectrum; and sending a channel access request based at least in part on the determination.

[0263] Aspect 57: A method according to any one of Aspects 37 to 56, wherein the LBT parameters include at least one of the following: an LBT window associated with a start time and an end time for clearing LBT; a reserved channel occupancy time slot; an identifier of the UE; or an interleaving index associated with reserved resources for the UE.

[0264] Aspect 58: A method according to Aspect 57, wherein the LBT parameters also include at least one of the following: a reserved gap between the end time for clearing the LBT and the transmission in the reserved resources; or a joint start LBT time for joint LBT performed by multiple UEs.

[0265] Aspect 59: The method according to aspect 57 or aspect 58, wherein the LBT parameters further include at least one of: a backoff counter value; a start transmission time associated with the customer premises equipment; or a deferral duration associated with the joint LBT.

[0266] Aspect 60: The method according to any one of aspects 37 to 59, wherein the indication further indicates a set of UEs eligible to participate in the coordinated access to the unlicensed spectrum.

[0267] Aspect 61: A method according to any one of Aspects 37 to 60, wherein the indication of the resource reservation further indicates at least one of the following for each UE in a group of UEs participating in the coordinated access to the unlicensed spectrum: an interleaving index assigned to the UE in the group; one or more subbands assigned to the UE in the group; or an identifier of the UE in the group.

[0268] Aspect 62: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 1 to 36.

[0269] Aspect 63: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 37 to 61.

[0270] Aspect 64: A device for wireless communication, the device comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 1 to 36.

[0271] Aspect 65: A device for wireless communication, the device comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 37 to 61.

[0272] Aspect 66: 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 36.

[0273] Aspect 67: An apparatus for wireless communication, the apparatus comprising: at least one means for performing the method according to one or more of aspects 37 to 61.

[0274] Aspect 68: 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 36.

[0275] Aspect 69: 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 37 to 61.

[0276] Aspect 70: 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 36.

[0277] Aspect 71: 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 37 to 61.

[0278] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of these aspects.

[0279] 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, processes and / or functions, etc. As used herein, a "processor" is implemented in a combination of hardware and / or hardware and software. It will be apparent that the systems and / or methods described herein can be implemented by a combination of hardware and / or hardware and software in different forms. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit various aspects. Therefore, no reference is made to specific software codes herein to describe the operation and behavior of the systems and / or methods, because those skilled in the art will understand that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0280] 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.

[0281] Although the specific combination of features is described 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 (it includes a single member). As an example, "at least one of a, b or c" is intended to cover a, b, c, a+b, a+c, b+c and a+b+c, and any combination with multiple identical elements (for example, a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c and c+c+c, or any other ordering of a, b and c).

[0282] Any element, action or instruction used herein should not be interpreted as critical or necessary unless clearly stated. In addition, as used herein, the article "one" is intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more items connected to the article "said", and can be used interchangeably with "one or more". In addition, as used herein, the terms "group" and "group" are intended to include one or more items, and can be used interchangeably with "one or more". If you only want to refer to an item, the phrase "only one" or similar terms will be used. Moreover, as used herein, the term "having" etc. is intended to be an open term, which does not limit the elements they modify (for example, "having" A elements can also have B). In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated. Furthermore, as used herein, the term "or" when used in a series is intended to be open-ended and used interchangeably with "and / or" unless expressly 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, the one or more processors configured to: sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum; and Communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters, and the interleaving index.

2. The apparatus of claim 1 , wherein the one or more processors are further configured to: A coordination message is received from the participant UE indicating recommended resources in the unlicensed spectrum.

3. The apparatus of claim 1 , wherein to send the indication, the one or more processors are configured to: The indication is sent based at least in part on coordinated access reservation sidelink control information.

4. The apparatus of claim 1 , wherein the one or more processors are further configured to: Resources in the unlicensed spectrum are assigned to the participant UE, wherein the resource reservation indicates the resources.

5. The apparatus of claim 1 , wherein the indication is a first indication, and wherein the one or more processors are further configured to: receiving a second indication from the participant UE, the second indication specifying at least one of: a channel access request or a buffer status report; and calculating an amount of resources to reserve in the unlicensed spectrum based at least in part on the second indication, Wherein the resource reservation is based at least in part on the calculated quantity of resources.

6. The apparatus of claim 5, wherein to receive the second indication, the one or more processors are configured to recover the channel access request or the buffer status report from multicast side link control information.

7. The apparatus of claim 6, wherein to receive the second indication, the one or more processors are configured to: Receiving the second indication based at least in part on: Physical sidelink feedback channel, or Physical side link shared channel.

8. The apparatus of claim 5, wherein the one or more processors are further configured to: The amount of resources to be reserved in an unlicensed spectrum is calculated based at least in part on a location of the participant UE satisfying a distance threshold.

9. The apparatus of claim 5, wherein to receive the second indication, the one or more processors are configured to: The second indication is received based at least in part on receiving a scheduling request.

10. The apparatus of claim 5, wherein the one or more processors are further configured to: determining a group of UEs based at least in part on receiving the second indication from the participant UE, wherein the group of UEs includes the participant UE, Wherein, in order to send the first indication, the one or more processors are configured to: The first indication is sent to each UE in the group of UEs.

11. The apparatus of claim 10, wherein the one or more processors are further configured to: Including the participant UE in the group of UEs is determined based at least in part on identifying the second indication as a request to participate in the coordinated access to the unlicensed spectrum.

12. The apparatus of claim 5, wherein the one or more processors are further configured to: Coordinated access reservation sidelink control information based at least in part on the second indication is sent as the first indication.

13. The device of claim 1, wherein the LBT parameters include at least one of: an LBT window associated with a start time and an end time for clearing the LBT, Reserved channel occupancy time slot, an identifier of a participating UE associated with said coordinated access to said unlicensed spectrum, or An interleaving index associated with reserved resources for the participant UE.

14. The apparatus of claim 1 , wherein the indication of the resource reservation further indicates, for each UE in a set of UEs participating in the coordinated access to an unlicensed spectrum, at least one of: an interlace index assigned to the UE in the group, one or more subbands assigned to the UE in the group, or Identifiers of the UEs in the group.

15. The apparatus of claim 1, wherein the one or more processors are further configured to: prior to sending said indication of said resource reservation associated with unlicensed spectrum, failing to receive valid coordinated access reservation sidelink control information from a number of coordinating UEs satisfying a counting threshold; and A determination is made based at least in part on the failure of the number to satisfy the counting threshold to serve as a coordinator UE for coordinated access to the unlicensed spectrum.

16. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: receiving an indication of resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum; and Communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters, and the interleaving index.

17. The apparatus of claim 16, wherein the one or more processors are further configured to: A coordination message is sent indicating recommended resources in the unlicensed spectrum.

18. The apparatus of claim 16, wherein the one or more processors are further configured to: Assigned resources associated with the unlicensed spectrum are received from a coordinating UE associated with the coordinated access to the unlicensed spectrum, wherein the resource reservation indicates the assigned resources.

19. The apparatus of claim 16, wherein the indication is a first indication, and wherein the one or more processors are further configured to: A second indication is sent, the second indication specifying at least one of: a channel access request or a buffer status report.

20. The apparatus of claim 19, wherein the one or more processors are further configured to: The sending resource is determined based at least in part on: Multicast identifier, Medium Access Control (MAC) Control Element (CE), or Second level side link control information, To send the second indication, the one or more processors are configured to send the second indication based at least in part on the sending resource.

21. The apparatus of claim 19, wherein the one or more processors are further configured to: Coordinated access reservation sidelink control information based at least in part on the second indication is received as the first indication.

22. The apparatus of claim 21, wherein the coordinated access reservation side link control information comprises at least one of: Reserve LBT window, a zone identifier associated with the coordinating UE, the coordination scope associated with the coordinating UE, or The maximum channel access priority level value associated with the resource reservation capability.

23. The apparatus of claim 21, wherein the one or more processors are further configured to: A determination is made whether to participate in the coordinated access to the unlicensed spectrum based at least in part on the coordinated access reservation sidelink control information.

24. The apparatus of claim 23, wherein the one or more processors are further configured to: determining to avoid participating in said coordinated access to said unlicensed spectrum, Wherein, in order to communicate in the wireless network, the one or more processors are configured to: Transmission is avoided in the wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters, and the interleaving index.

25. The apparatus of claim 16, wherein the one or more processors are further configured to: determining to participate in the coordinated access to the unlicensed spectrum; and A channel access request is sent based at least in part on a determination to join the coordinated access.

26. The apparatus of claim 16, wherein the indication of the resource reservation further indicates, for each UE in a set of UEs participating in the coordinated access to an unlicensed spectrum, at least one of: an interlace index assigned to the UE in the group, one or more subbands assigned to the UE in the group, or Identifiers of the UEs in the group.

27. A method of wireless communication performed by a user equipment (UE), the method comprising: sending an indication of a resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to a participant UE associated with coordinated access to the unlicensed spectrum; and Communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters, and the interleaving index.

28. The method of claim 27, wherein the indication of the resource reservation further indicates, for each UE in a group of UEs participating in the coordinated access to unlicensed spectrum, at least one of: an interlace index assigned to the UE in the group, one or more subbands assigned to the UE in the group, or Identifiers of the UEs in the group.

29. A method of wireless communication performed by a user equipment (UE), the method comprising: receiving an indication of resource reservation associated with an unlicensed spectrum, the indication specifying at least a listen-before-talk (LBT) parameter associated with a channel access procedure for accessing the unlicensed spectrum and an interleaving index associated with resources in the unlicensed spectrum assigned to the UE, the indication being associated with coordinated access to the unlicensed spectrum; and Communicating in a wireless network based at least in part on the resource reservation associated with the unlicensed spectrum, the LBT parameters, and the interleaving index.

30. The method of claim 29, wherein communicating in the wireless network comprises: Communicating in the wireless network is performed based at least in part on the indication of the resource reservation.

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