Overlapping resource pools in sidelink communications

Abstract

Wireless communication systems, apparatuses, and methods are provided. A method of wireless communication performed by a first sidelink user equipment (UE) may include monitoring a first resource pool (RP) associated with a time slot; monitoring a second RP associated with one or more sub-slots, wherein the second RP at least partially overlaps the first RP; receiving, from a second sidelink UE, an indicator indicating selection of the first RP or the second RP; and receiving a communication from the second sidelink UE via the first RP or the second RP based on the indicator.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of U.S. Patent Application No. 17 / 660,613, filed on April 25, 2022, the disclosure of which is incorporated herein by reference in its entirety and for all applicable purposes. Technical Field

[0003] The present application relates to wireless communication systems, and more particularly to overlapping resource pools in sidelink communications. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems are capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless multiple-access communication system may include multiple base stations (BSs), each of which simultaneously supports communication for multiple communication devices, which may also be referred to as user equipment (UE).

[0005] In order to meet the growing demand for extended mobile broadband connectivity, wireless communication technology is evolving from LTE technology to next-generation new radio (NR) technology. For example, compared to LTE, NR is designed to provide lower latency, higher bandwidth or throughput, and higher reliability. NR is designed to operate on a wide spectrum band array, for example, from low frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz to high frequency bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed spectrum and shared spectrum. Spectrum sharing enables operators to have the opportunity to aggregate spectrum to dynamically support high-bandwidth services. Spectrum sharing can extend the benefits of NR technology to operating entities that may not have access to licensed spectrum.

[0006] NR can support various deployment scenarios to benefit from various spectrums (licensed and / or unlicensed spectrum) in different frequency ranges and / or the coexistence of LTE technology and NR technology. For example, NR can be deployed in standalone NR mode on licensed and / or unlicensed bands, or in dual connectivity mode with various combinations of NR and LTE on licensed and / or unlicensed bands.

[0007] In a wireless communication network, a BS can communicate with a UE in both the uplink and downlink directions. Sidelinks were introduced in LTE to allow a UE to transmit data to another UE (e.g., from one vehicle to another vehicle) without tunneling through the BS and / or associated core network. LTE sidelink technology has been extended to provisioning for device-to-device (D2D) communications, vehicle-to-everything (V2X) communications, and / or cellular vehicle-to-everything (C-V2X) communications. Similarly, NR can be extended to support sidelink communications, D2D communications, V2X communications, and / or C-V2X on licensed and / or unlicensed bands (e.g., shared bands). Summary of the invention

[0008] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not an exhaustive overview of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor to delineate the scope of any or all aspects of the present disclosure. The sole purpose of this summary is to present some concepts of one or more aspects of the present disclosure in a summarized form as a prelude to more specific embodiments presented later.

[0009] In one aspect of the present disclosure, a method for wireless communication performed by a first sidelink user equipment (UE) may include: monitoring a first resource pool (RP) associated with a time slot; monitoring a second RP associated with one or more sub-time slots, wherein the second RP at least partially overlaps with the first RP; receiving an indicator indicating selection of the first RP or the second RP from a second sidelink UE; and receiving communication from the second sidelink UE via the first RP or the second RP based on the indicator.

[0010] In an additional aspect of the present disclosure, a method for wireless communication performed by a first sidelink user equipment (UE) may include: performing a listen-before-talk (LBT) process in a shared frequency band; based on success of the LBT process, selecting a first resource pool (RP) or a second RP, wherein the second RP at least partially overlaps with the first RP; sending an indicator indicating the selected first RP or the selected second RP to a second sidelink UE; and sending communication to the second sidelink UE based on the indicator.

[0011] In an additional aspect of the present disclosure, a first sidelink user equipment (UE) may include: a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, wherein the first sidelink UE is configured to: monitor a first resource pool (RP) associated with a time slot; monitor a second RP associated with one or more sub-time slots, wherein the second RP at least partially overlaps with the first RP; receive an indicator indicating selection of the first RP or the second RP from a second sidelink UE; and receive communications from the second sidelink UE via the first RP or the second RP based on the indicator.

[0012] In an additional aspect of the present disclosure, a first sidelink user equipment (UE) may include: a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, wherein the first sidelink UE is configured to: perform a listen-before-talk (LBT) process in a shared frequency band; based on success of the LBT process, select a first resource pool (RP) or a second RP, wherein the second RP at least partially overlaps with the first RP; send an indicator indicating the selected first RP or the selected second RP to a second sidelink UE; and send communications to the second sidelink UE based on the indicator.

[0013] After reading the description of the specific exemplary embodiments of the present invention below in conjunction with the accompanying drawings, other aspects, features and examples of the present invention will become apparent to those of ordinary skill in the art. Although the features of the present invention may be discussed below with respect to certain aspects and drawings, all examples of the present invention may include one or more of the advantageous features discussed herein. In other words, although one or more examples may be discussed as having certain advantageous features, one or more of such features may also be used according to the various examples of the present invention discussed herein. In a similar manner, although the exemplary aspects may be discussed below as device, system or method examples, it should be understood that such exemplary examples may be implemented in various devices, systems and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A wireless communication network according to some aspects of the present disclosure is illustrated.

[0015] Figure 2 An example disaggregated base station architecture is illustrated in accordance with some aspects of the present disclosure.

[0016] Figures 3A to 3G An example of overlapping resource pools in sidelink communications according to some aspects of the present disclosure is illustrated.

[0017] Figure 4 An example of overlapping resources in sidelink communications according to some aspects of the present disclosure is illustrated.

[0018] Figure 5 is a signaling diagram of a wireless communication method according to some aspects of the present disclosure.

[0019] Figure 6 is a block diagram of an exemplary user equipment (UE) according to some aspects of the present disclosure.

[0020] Figure 7 is a block diagram of an exemplary network element according to some aspects of the present disclosure.

[0021] Figure 8 is a flow chart of a communication method according to some aspects of the present disclosure.

[0022] Fig. 9 is a flow chart of a communication method according to some aspects of the present disclosure. DETAILED DESCRIPTION

[0023] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. In order to provide a comprehensive understanding of the various concepts, the specific embodiments include specific details. However, it is apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, in order to avoid obscuring such concepts, well-known structures and components are shown in block diagram form.

[0024] The present disclosure as a whole relates to wireless communication systems, which are also referred to as wireless communication networks. In various instances, techniques and devices can be used for wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5th generation (5G) or new radio (NR) networks, and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0025] OFDMA network can realize radio technology such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA and Global System for Mobile Communications (GSM) are parts of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS using E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These radio technologies and standards are known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between telecommunication association groups with the goal of defining a globally applicable third generation (3G) mobile phone specification. 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure relates to the evolution from LTE, 4G, 5G, NR and beyond wireless technologies, where access to the wireless spectrum is shared between networks using a range of new and different radio access technologies or radio air interfaces.

[0026] Specifically, 5G networks consider various deployments, various spectrums, and various services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to scale to (1) ultra-high density (e.g., about 1M nodes / km) 2 (1) provide coverage for the massive Internet of Things (IoT) with ultra-low complexity (e.g., on the order of tens of bits per second), ultra-low energy (e.g., on the order of 10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) provide coverage including mission-critical control with strong security to protect sensitive personal, financial, or classified information, ultra-high reliability (e.g., on the order of 99.9999% reliability), ultra-low latency (e.g., on the order of 1 millisecond), and for users with extensive mobility or lack of mobility; and (3) provide coverage with enhanced mobile broadband (including extremely high capacity (e.g., on the order of 10 Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep awareness coverage with advanced discovery and optimization.

[0027] 5G NR can be implemented using an optimized OFDM-based waveform with scalable parameter sets and transmission time intervals (TTIs); with a common, flexible framework to efficiently multiplex services and features using dynamic low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and with advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel decoding, and device-centric mobility. The scalability of parameter sets in 5G NR and the scaling of subcarrier spacing can effectively address the operation of various services across different spectrums and different deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD / TDD implementations, the subcarrier spacing may appear at 15kHz on bandwidths (BW) such as 5MHz, 10MHz, 20MHz, etc. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing may appear at 30kHz on 80 / 100MHz BW. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5 GHz band, subcarrier spacing may occur at 60 kHz over 160 MHz BW. Finally, for various deployments transmitting with the mmWave component at 28 GHz TDD, subcarrier spacing may occur at 120 kHz over 500 MHz BW.

[0028] 5G NR's scalable parameter sets facilitate scalable TTIs for different latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmission to start on symbol boundaries. 5G NR also envisions a self-contained integrated subframe design with uplink / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed spectrum or contention-based shared spectrum, adaptive uplink / downlink, which can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current business needs.

[0029] The various other aspects and features of the present disclosure are further described below. It should be apparent that the teachings herein can be embodied in various forms, and any specific structure, function, or both disclosed herein are merely representative and not restrictive. Based on the teachings herein, it should be understood by those of ordinary skill in the art that the aspects disclosed herein can be implemented independently of any other aspects, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement a device or practice a method. In addition, such a device can be implemented or such a method can be practiced using other structures, functionality, or structures and functionality other than or different from one or more of the aspects set forth herein. For example, the method can be implemented as a part of a system, device, device, and / or as an instruction stored on a computer-readable medium for execution on a processor or computer. In addition, one aspect can include at least one element of a claim.

[0030] Deploying NR on unlicensed spectrum is called NR unlicensed (NR-U). The Federal Communications Commission (FCC) and the European Telecommunications Standards Institute (ETSI) are working to regulate 6 GHz as a new unlicensed band for wireless communications. The addition of the 6 GHz band allows hundreds of megahertz (MHz) of bandwidth (BW) to be used for unlicensed band communications. In addition, NR-U can also be deployed on the 2.4 GHz unlicensed band, which is currently shared by various radio access technologies (RATs), such as IEEE 802.11 wireless local area networks (WLANs) or WiFi and / or licensed assisted access (LAA). Sidelink communications can benefit from utilizing the additional bandwidth available in unlicensed spectrum. However, channel access in a specific unlicensed spectrum may be regulated by official agencies. For example, some unlicensed bands may impose restrictions on the power spectral density (PSD) and / or minimum occupied channel bandwidth (OCB) of transmissions in unlicensed bands. For example, the unlicensed national information infrastructure (UNII) radio band has a minimum OCB requirement of about at least 70%.

[0031] Some sidelink systems may operate on a 20 MHz bandwidth in an unlicensed band, for example, for listen-before-talk (LBT) based channel access. The BS may configure a sidelink resource pool on one or more 20 MHz LBT sub-bands for sidelink communication. The sidelink resource pool is typically allocated with a plurality of frequency subchannels within a sidelink bandwidth part (SL-BWP), and the sidelink UE may select a sidelink resource (e.g., one or more subchannels in frequency and one or more time slots in time) from the sidelink resource pool for sidelink communication.

[0032] The deployment of a communication system (such as a 5G New Radio (NR) system) can be arranged with various components or constituent parts in a variety of ways. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element or a network equipment (such as a base station (BS) or one or more units (or one or more components) performing base station functionality) can be implemented in an aggregated or decomposed architecture. For example, a BS (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a transmit receive point (TRP) or a cell, etc.) can be implemented as an aggregated base station (also referred to as an independent BS or a monolithic BS) or a decomposed base station.

[0033] A converged base station may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node. A decomposed base station may be configured to utilize a protocol stack physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (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, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0034] 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 and 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)). Decomposition may include distributing functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which may enable flexibility in network design. Individual units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0035] Figure 1A wireless communication network 100 according to some aspects of the present disclosure is illustrated. The network 100 includes multiple base stations (BSs) 105 and other network entities. The BSs 105 may be stations that communicate with the UEs 115, and may also be referred to as evolved Node Bs (eNBs), next generation eNBs (gNBs), access points, etc. Each BS 105 may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the particular geographic coverage area of ​​the BS 105 and / or the BS subsystem serving the coverage area, depending on the context in which the term is used.

[0036] BS105 may provide communication coverage for macro cells or small cells (such as pico cells or femto cells) and / or other types of cells. Macro cells generally cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with a network provider. Small cells (such as pico cells) will generally cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with a network provider. Small cells (such as femto cells) will generally also cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs associated with the femto cells (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS, or a home BS. In Figure 1 In the example shown, BS105d and 105e may be conventional macro BSs, while BS105a-105c may be macro BSs with one of three-dimensional (3D), full-dimensional (FD) or massive MIMO capabilities. BS 105a-105c may utilize its higher-dimensional MIMO capabilities to employ 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. BS105f may be a small cell BS, which may be a home node or a portable access point. BS105 may support one or more (e.g., two, three, four, etc.) cells.

[0037] Network 100 may support synchronous operation or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.

[0038] UE 115 is dispersed throughout the wireless network 100, and each UE 115 can be stationary or mobile. UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, etc. UE 115 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, etc. In one aspect, UE 115 may be a device including a universal integrated circuit card (UICC). On the other hand, UE may be a device that does not include a UICC. In some aspects, UE 115 that does not include a UICC may also be referred to as an IoT device or an Internet of Everything (IoE) device. UE 115a-115d is an example of a mobile smart phone type device that accesses the network 100. UE 115 may also be a machine that is specifically configured for connected communications (including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc.). UE 115e-115h are examples of various machines configured for communication to access network 100. UE 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication to access network 100. UE 115 is capable of communicating with any type of BS (whether macro BS, small cell, etc.). Figure 1 , a lightning symbol (e.g., a communication link) indicates wireless transmission between UE 115 and a serving BS 105 (which is a BS designated to provide service to UE 115 on a downlink (DL) and / or uplink (UL), desired transmission between BSs 105, backhaul transmission between BSs, or sidelink transmission between UE 115.

[0039] In operation, BS 105a-105c uses 3D beamforming and cooperative spatial techniques (such as coordinated multi-point (CoMP) or multiple connections) to serve UEs 115a and 115b. Macro BS 105d can perform backhaul communications with BS 105a-105c and small cell BS 105f. Macro BS 105d also sends multicast services that UEs 115c and 115d subscribe to and receive. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

[0040] BS 105 may also communicate with a core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing, or mobility functions. At least some of BSs 105 (e.g., which may be examples of evolved Node Bs (eNBs) or access node controllers (ANCs)) may interface with the core network 130 via a backhaul link (e.g., S1, S2, etc.), and may perform radio configuration and scheduling to communicate with UE 115. In various examples, BSs 105 may communicate with each other directly or indirectly (e.g., via a core network) via a backhaul link (e.g., X1, X2, etc.), which may be a wired communication link or a wireless communication link.

[0041] The network 100 may also support mission-critical communications with ultra-reliable and redundant links for mission-critical devices such as UE 115e, which may be a vehicle (e.g., a car, truck, bus, autonomous vehicle, airplane, ship, etc.). The redundant communication links with UE 115e may include links from macro BSs 105d and 105e, and a link from a small cell BS 105f. Other machine-type devices such as UE 115f (e.g., a thermometer), UE 115g (e.g., a smart meter), and UE 115h (e.g., a wearable device) may communicate directly with a BS (such as small cell BS 105f and macro BS 105e) through the network 100, or in a multi-hop configuration by communicating with another user device that relays its information to the network (such as UE 115f communicating temperature measurement information to smart meter UE 115g, which is then reported to the network through small cell BS 105f). In some aspects, the UE 115h can harvest energy from the surrounding environment associated with the UE 115h. The network 100 can also provide additional network efficiency through dynamic, low-latency TDD / FDD communications such as vehicle-to-vehicle (V2V) communications between the UE 115i, 115j, or 115k and other UEs 115, vehicle-to-everything (V2X) communications, cellular vehicle-to-everything (C-V2X) communications, and / or vehicle-to-infrastructure (V2I) communications between the UE 115i, 115j, or 115k and the BS 105.

[0042] In some implementations, the network 100 utilizes an OFDM-based waveform for communication. An OFDM-based system may divide the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, frequency bins, etc. Each subcarrier may be modulated with data. In some instances, the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may depend on the system BW. The system BW may also be divided into subbands. In other instances, the subcarrier spacing and / or the duration of the TTI may be scalable.

[0043] In some instances, BS105 may assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) transmission and uplink (UL) transmission in network 100. DL refers to the transmission direction from BS105 to UE 115, and UL refers to the transmission direction from UE 115 to BS105. The communication may be in the form of a radio frame. The radio frame may be divided into a plurality of subframes, such as about 10. Each subframe may be divided into time slots, such as about 2. Each time slot may also be divided into micro-time slots. In FDD mode, simultaneous UL transmission and DL transmission may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band. In TDD mode, UL transmission and DL transmission occur in different time periods using the same frequency band. For example, a subframe subset (e.g., a DL subframe) in a radio frame may be used for DL ​​transmission, and another subframe subset (e.g., a UL subframe) in a radio frame may be used for UL transmission.

[0044] DL subframes and UL subframes may also be divided into several zones. For example, each DL subframe or UL subframe may have a predefined zone for the transmission of reference signals, control information, and data. Reference signals are predetermined signals that facilitate communication between BS105 and UE 115. For example, a reference signal may have a specific pilot pattern or structure, wherein a pilot tone may span an operational BW or frequency band, and each pilot tone may be located at a predefined time and a predefined frequency. For example, BS105 may send a cell-specific reference signal (CRS) and / or a channel state information-reference signal (CSI-RS) to enable UE 115 to estimate a DL channel. Similarly, UE 115 may send a sounding reference signal (SRS) to enable BS105 to estimate an UL channel. Control information may include resource assignments and protocol controls. Data may include protocol data and / or operational data. In some instances, BS105 and UE115 may communicate using self-contained subframes. Self-contained subframes may include a portion for DL ​​communication and a portion for UL communication. A self-contained subframe may be DL-centric or UL-centric. A DL-centric subframe may include a DL communication duration that is longer than a UL communication duration. A UL-centric subframe may include a UL communication duration that is longer than a UL communication duration.

[0045] In some instances, network 100 may be an NR network deployed on a licensed spectrum. BS 105 may send synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in network 100 to facilitate synchronization. BS 105 may broadcast system information associated with network 100 (e.g., including a master information block (MIB), remaining minimum system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some instances, BS 105 may broadcast PSS, SSS, and / or MIB in the form of a synchronization signal block (SSB) on a physical broadcast channel (PBCH), and may broadcast RMSI and / or OSI on a physical downlink shared channel (PDSCH).

[0046] In some examples, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from the BS 105. The PSS may enable synchronization of period timing and may indicate a physical layer identification value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identification value that may be combined with the physical layer identification value to identify the cell. The SSS may also enable detection of duplex mode and cyclic prefix length. The PSS and SSS may be located in the center portion of the carrier or at any suitable frequency within the carrier.

[0047] After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 may receive the RMSI and / or OSI. The RMSI and / or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource sets (CORESET) for physical downlink control channel (PDCCH) monitoring, physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), power control, SRS, and cell barring.

[0048] After obtaining the MIB, RMSI, and / or OSI, the UE 115 may perform a random access procedure to establish a connection with the BS 105. For the random access procedure, the UE 115 may send a random access preamble, and the BS 105 may respond with a random access response. Upon receiving the random access response, the UE 115 may send a connection request to the BS 105, and the BS 105 may respond with a connection response (e.g., a contention resolution message).

[0049] After the connection is established, the UE 115 and the BS 105 may enter a normal operation phase, in which operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL communication and / or DL ​​communication. The BS 105 may send an UL scheduling grant and / or a DL scheduling grant to the UE 115 via the PDCCH. The BS 105 may send a DL communication signal to the UE 115 via the PDSCH according to the DL scheduling grant. The UE 115 may send an UL communication signal to the BS 105 via the PUSCH and / or the PUCCH according to the UL scheduling grant.

[0050] The network 100 can be designed to implement a wide range of use cases. Although in some examples, the network 100 can utilize a monolithic base station, there are a variety of other architectures that can be used to perform various aspects of the present disclosure. For example, BS105 can be divided into a remote radio head (RRH) and a baseband unit (BBU). The BBU can be concentrated in a BBU pool and connected to the RRH via a low-latency and high-bandwidth transmission link (such as an optical transmission link). The BBU pool can be a cloud-based resource. In some aspects, baseband processing is performed on a virtualized server running in a data center rather than co-located with the BS105. In another example, base station functionality can be split between a remote unit (RU), a distributed unit (DU), and a central unit (CU). The RU typically performs low physical layer functions, while the DU performs higher layer functions, which may include higher physical layer functions. The CU performs higher RAN functions, such as radio resource control (RRC).

[0051] For simplicity of discussion, the present disclosure relates to the method of the present disclosure being performed by a base station, or more generally by a network entity, while the functionality may be performed by various architectures other than a monolithic base station. In addition to a disaggregated base station, various aspects of the present disclosure may also be performed by a centralized unit (CU), a distributed unit (DU), a radio unit (RU), a near real-time (near RT) RAN intelligent controller (RIC), a non-real-time (non-RT) RIC, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, etc.

[0052] In some aspects, UE 115j may monitor a first resource pool (RP) associated with a time slot. UE 115j may monitor a second RP associated with one or more sub-time slots. The second RP may at least partially overlap with the first RP. UE 115j may receive an indicator from UE 115k indicating selection of the first RP or the second RP. UE 115j may receive communications from UE 115k based on the indicator.

[0053] Figure 2 A diagram illustrating an example disaggregated base station 1200 architecture is shown. The disaggregated base station 1200 architecture may include one or more central units (CUs) 1210 that may communicate directly with a core network 1220 via a backhaul link, or indirectly with the core network 1220 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 1225 via an E2 link, or a non-real-time (non-RT) RIC 1215 associated with a service management and orchestration (SMO) framework 1205, or both. The CU 1210 may communicate with one or more distributed units (DUs) 1230 via respective midhaul links, such as an F1 interface. The DU 1230 may communicate with one or more radio units (RUs) 1240 via respective fronthaul links. The RU 1240 may communicate with respective UEs 120 via one or more radio frequency (RF) access links. In some implementations, a UE 120 may be served simultaneously by multiple RUs 1240.

[0054] Each of the units (i.e., CU 1210, DU 1230, RU 1240, and near-RT RIC 1225, non-RT RIC 1215, and SMO framework 1205) may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive or send signals to one or more of the other units via a wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, a transmitter, or a transceiver (such as a radio frequency (RF) transceiver) configured to receive or send signals or both to one or more of the other units via a wireless transmission medium.

[0055] In some aspects, CU 1210 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface that is configured to communicate signals with other control functions hosted by CU 1210. CU1210 may be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 1210 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 1210 may be implemented to communicate with DU 1230 for network control and signaling.

[0056] DU 1230 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 1240. In some aspects, DU 1230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to a functional split such as those defined by the Third Generation Partnership Project (3GPP). In some aspects, DU 1230 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 1230 or with control functions hosted by CU 1210.

[0057] The lower layer functions may be implemented by one or more RUs 1240. In some deployments, the RU 1240 controlled by the DU 1230 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on functional splitting (such as lower layer functional splitting). In such an architecture, the RU 1240 may be implemented to handle over-the-air (OTA) communications with one or more UEs 120. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 1240 may be controlled by the corresponding DU 1230. In some scenarios, this configuration may enable the DU 1230 and CU 1210 to be implemented in a cloud-based RAN architecture (such as a vRAN architecture).

[0058] The SMO framework 1205 may be configured to support RAN deployment and configuration of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 1205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 1205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 1290) to perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 1210, DU 1230, RU 1240, and near-RT RIC 1225. In some specific implementations, the SMO framework 1205 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 1211) via the O1 interface. Additionally, in some implementations, the SMO framework 1205 can communicate directly with one or more RUs 1240 via the O1 interface. The SMO framework 1205 can also include a non-RT RIC 1215 configured to support the functionality of the SMO framework 1205.

[0059] The non-RT RIC 1215 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 1225. The non-RT RIC 1215 may be coupled to or communicate with the near-RT RIC 1225 (such as via an A1 interface). The near-RT RIC 1225 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 1210, one or more DUs 1230, or both, and the O-eNB with the near-RT RIC 1225.

[0060] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 1225, the non-RT RIC 1215 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 1225 and may be received from a non-network data source or from a network function at the SMO framework 1205 or the non-RT RIC 1215. In some examples, the non-RT RIC 1215 or the near-RT RIC 1225 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 1215 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 1205 (such as via reconfiguration of O1) or via creation of RAN management policies (such as A1 policies).

[0061] In some aspects, the first UE 120 monitors a first resource pool (RP) associated with a time slot. The first UE 120 may monitor a second RP associated with one or more sub-time slots. The second RP may at least partially overlap with the first RP. The first UE 120 may receive an indicator from the second UE 120 indicating a selection of the first RP or the second RP. The first UE 120 may receive a communication from the second UE 120 based on the indicator.

[0062] Figures 3A to 3G An example of resource configuration for supporting overlapping resource pools in sidelink communications according to some aspects of the present disclosure is illustrated. Resource configuration may be implemented by aspects of wireless communication network 100 and / or wireless communication network 1200. For example, resource configuration may be implemented by one or more UEs (e.g., UE 115, UE 120, or UE 600) for sidelink communications, as described by wireless communication networks 100 and / or 1200. Figures 3A to 3G , the x-axis represents time in some arbitrary units.

[0063] In some aspects, a first sidelink UE (e.g., UE 115, UE 120, or UE 600) may monitor RP(0) associated with time slot 338 and / or RP(1) associated with one or more sub-time slots 340. The first sidelink UE may receive a configured grant (e.g., a dynamic grant) from a network element (e.g., BS 105, RU 1240, DU 1230, CU 1210, or network element 700) that indicates RP(0) and / or RP(1). In this regard, the first sidelink UE may operate in sidelink mode 1 and receive a configured grant for RP(0) and / or RP(1) in an RRC message and / or a DCI message (e.g., a DCI-3 message, a DCI-1 message). In some aspects, a single configured grant may indicate RP(0) and RP(1). In some aspects, a first configured grant may indicate RP(0) and a second configured grant may indicate RP(1). RP(0) may indicate time / frequency resources associated with a time slot 338 allocated to a first sidelink UE. RP(1) may indicate time / frequency resources associated with one or more sub-slots 340 allocated to a first sidelink UE. Frequency resources may include a spectrum, a frequency band, a frequency sub-band, a frequency sub-channel, a resource element, a resource block, and / or a frequency interlace.

[0064] In some aspects, the time slot 338 may be divided into sub-time slots 340 such that each sub-time slot 340 occupies a plurality of symbols within the time slot 338. For example, the time slot 338 may include 2, 3, 4, or more sub-time slots 340. In some instances, the time slot 338 may include 14 symbols. The sub-time slots 340 may occupy 2, 3, 4, 5, 6, or more symbols. In some aspects, each sub-time slot 340 may occupy consecutive symbols (e.g., symbols 0-6 or symbols 7-13) within the time slot 338. By dividing the time slot 338 into sub-time slots 340, the second UE (e.g., the sidelink transmitting UE) may increase the number of potential starting positions for the COT based on increasing the number of LBT processes that may be performed per time slot 338.

[0065] In some aspects, RP(1) may at least partially overlap (e.g., partially overlap in time) with RP(0). For example, one or more subslots 340 may overlap only with symbols of slot 338 of RP(0). In other words, symbols of subslot 340 of RP(1) are not outside of symbols of slot 338 of RP(0). One or more subslots 340 of RP(1) may overlap with at least one leading symbol of slot 338 of RP(0). In some aspects, all symbols of subslot 340 of RP(1) overlap with leading symbols of slot 338 of RP(0). For example, subslot 340 of RP(1) may occupy symbol indices 0 to x, which overlap with symbol indices 0 to x of slot 338 of RP(0). In some aspects, one or more subslots 340 of RP(1) overlap with at least one trailing symbol of slot 338 of RP(0). For example, the subslots 340 of RP(1) may occupy symbol indices x through 13 that overlap with symbol indices x through 13 of the slots 338 of RP(0). In some aspects, one or more subslots 340 of RP(1) may overlap with at least one post-symbol of the slot 338 of RP(0) and at least one pre-symbol of an adjacent slot 338. For example, a pre-symbol of a subslot 340 of RP(1) may overlap with a post-symbol of a slot 338 of RP(0), and a post-symbol of a subslot 340 of RP(1) may overlap with a pre-symbol of another slot 338 adjacent to the slot 338 of RP(0).

[0066] like Figure 3A As shown, symbols of slot 338 of RP(0) may completely overlap with symbols of subslot 340(1) and subslot 340(2) of RP(1). In some aspects, subslots 340 may include an equal number of symbols. For example, each of subslots 340(0) and 340(1) may include seven symbols. Symbol indices 0 through 6 of subslot 340(0) may overlap with symbol indices 0 through 6 of slot 338, and symbol indices 0 through 6 of subslot 340(1) may overlap with symbol indices 7-13 of slot 338.

[0067] like Figure 3BAs shown, the symbols of slot 338 of RP(0) may completely overlap with the symbols of subslot 340(0), subslot 340(1), and subslot 340(2) of RP(1). In some aspects, subslots 340 may include unequal numbers of symbols. For example, subslots 340(0) and 340(1) may include five symbols, while subslot 340(2) may include four symbols. Symbol indices 0 through 4 of subslot 340(0) may overlap with symbol indices 0 through 4 of slot 338. Symbol indices 0 through 4 of subslot 340(1) may overlap with symbol indices 5-9 of slot 338. Symbol indices 0 through 3 of subslot 340(2) may overlap with symbol indices 10 through 13 of slot 338.

[0068] like Figure 3C As shown, symbols of slot 338 of RP(0) may partially overlap symbols of subslot 340(0) of RP(1). In some aspects, RP(1) may include a single subslot 340(0) that may not begin simultaneously with slot 338. For example, subslot 340(0) may overlap with a trailing symbol of slot 338.

[0069] like Figure 3D As shown, symbols of slot 338 of RP(0) may partially overlap symbols of subslot 340(0) and subslot 340(1) of RP(1). In some aspects, RP(1) may include two subslots 340(0) and 340(1) that may not begin simultaneously with slot 338. For example, subslot 340(0) and subslot 340(1) may overlap with trailing symbols of slot 338.

[0070] like Figure 3E As shown, in some aspects, a configured grant may include more than two RPs. For example, RP(0) may include time slot 338. RP(1) may include sub-slots 340(0) and 340(1) that overlap with the pilot symbol of time slot 338. A third RP(2) may include sub-slot 340(0) that overlaps with sub-slot 340(1) of the second RP and overlaps with the pilot symbol of time slot 338 of the first RP(0).

[0071] like Figure 3F As shown, the symbols of slot 338 of RP(0) may partially overlap with the symbols of subslot 340(0) of RP(1). In some aspects, the second RP may include subslot 340(0) overlapping with the trailing symbol of slot 338(0) and the leading symbol of the next slot 338(1).

[0072] like Figure 3GAs shown, the trailing symbol of time slot 338(0) of RP(0) may overlap with the leading symbol of time slot 338(1) of RP(1), and the leading symbol of another adjacent time slot 338(1) of RP(0) may overlap with the trailing symbol of time slot 338(1) of RP(1).

[0073] In some aspects, the first sidelink UE may simultaneously monitor RP(0) associated with time slot 338 and RP(1) associated with one or more sub-time slots 340 for PSCCH communication (e.g., SCI in PSCCH communication). In some aspects, the first sidelink UE may simultaneously monitor RP(0) associated with time slot 338 and RP(1) associated with one or more sub-time slots 340 based on the number of one or more sub-time slots 340. RP(1) may include one or more sub-time slots 340. The first sidelink UE may be configured with the ability to monitor all sub-time slots in the one or more sub-time slots 340. For example, the first sidelink UE may be configured with computing resources (e.g., CPU power, memory capacity, etc.) and / or power resources (e.g., battery power, line power, etc.) sufficient to monitor all sub-time slots in the one or more sub-time slots 340 of RP(1). In some aspects, the first sidelink UE may not be configured with sufficient computing resources and / or power resources to monitor all sub-time slots in the one or more sub-time slots 340 in RP(1). For example, the first sidelink UE may be configured with computing resources sufficient to monitor only one of the sub-slots 340 .

[0074] Figure 4An example of overlapping resources 400 in sidelink communications according to some aspects of the present disclosure is illustrated. In some aspects, a first RP and a second RP may share common resources associated with a physical sidelink feedback channel (PSFCH) 406. The PSFCH 406 carrying HARQ feedback in the first RP may share common time resources (e.g., the same symbol and / or subchannel) with the PSFCH 406 carrying HARQ feedback in the second RP. For example, the PSFCH 406 in symbol 12 of slot 338 may share common resources in overlapping symbol 5 of subslot 340(1). The first RP and the second RP may share a common PSFCH periodicity. In some aspects, the first RP and the second RP may share common frequency resources for the PSFCH. Additionally or alternatively, the frequency resources of the PSFCH in the first RP may be multiplexed (e.g., frequency division multiplexed) with the frequency resources of the PSFCH in the second RP. The first sidelink UE and the second sidelink UE may receive an indication of the first RP and the second RP in a configured grant (e.g., a dynamically configured grant) from a network element (e.g., BS 105, RU 1240, DU 1230, CU 1210, or network element 700). The configured grant may indicate resource elements of a common SCI-1, a common SCI-2, and / or a common PSFCH.

[0075] In some aspects, the first RP and the second RP may share common resources associated with sidelink control information (SCI). For example, a PSCCH carrying SCI-1 402 in symbols 1 and 2 of slot 338 may share common resource elements (e.g., the same symbol and / or subchannel) with a PSCCH carrying SCI-1 402 in symbols 1 and 2 of subslot 340(0). Since slot 338 in the first RP carries only a single SCI-1 402, the first RP and the second RP may share a single set of common resources associated with SCI-1 402. In this way, the first sidelink UE may decode SCI-1 402 using the single set of common resource elements in symbols 1 and 2.

[0076] The common SCI-1 402 may indicate the resources of the selected RP (e.g., AGC symbol 414, PSSCH 412 length, sub-slot 340 length). In some aspects, the SCI-1 402 may indicate the selected RP as a code point, information element, or other suitable indicator. In some aspects, the indicator may be a binary indicator (e.g., a single bit "0" or "1"). For example, an indicator value of "0" may indicate the use of a first RP, while an indicator of "1" may indicate the use of a second RP. Alternatively, an indicator value of "0" may indicate the use of a second RP, while an indicator of "1" may indicate the use of a first RP. In some aspects, the SCI-1 402 may use different cyclic redundancy check (CRC) scrambling of the SCI-1 402 to indicate the selected RP. By using a common SCI-1 402 and indicating a dynamic PSSCH length in the SCI-1 402, a low-capability sidelink UE is able to decode a full slot of the first RP and a leading subslot 340(0) of the second RP (e.g., a subslot 340(0) of the second RP having symbols 0-6 that overlap with the leading symbol of slot 338). By using a common SCI-1 402 and indicating a dynamic PSSCH length in the SCI-1 402, a high-capability sidelink UE monitoring both the first RP and the second RP may perform a single SCI-1 402 decode.

[0077] The first side link UE may receive a common SCI-2 404 (e.g., common resources in the first RP and the second RP) to indicate whether the selected RP is the first RP or the second RP. In some aspects, the PSSCH carrying the SCI-2 404 in the first RP in symbols 1 and 2 may share common resource elements (e.g., the same symbols and / or subchannels) with the PSSCH carrying the SCI-2 404 in the second RP. Since the time slot 338 in the first RP carries only a single SCI-2 404, the first RP and the second RP may share a single set of common resources in symbols 1 and 2 associated with the SCI-2 404. In this way, the first side link UE may decode the SCI-2 404 using a single set of common resource elements. Sharing common resources between the time slot 338 of the first RP and the leading subslot 340 (0) of the second RP for SCI-1 402 and / or SCI-2 404 may reduce computational resources and / or power consumption in the first side link UE.

[0078] After the first sidelink UE decodes the common SCI-1 402, the first sidelink UE may need to know the number of PSSCH resources (e.g., the number of symbols) carrying the common SCI-2 404. The common SCI-1 402 may include an indication of the PSSCH resources (e.g., the number of symbols) carrying the common SCI-2 404. The first sidelink UE may receive an indicator for using the first RP or the second RP from the second sidelink UE via the common SCI-1 402 or the common SCI-2 404. The second sidelink UE may send an RP indicator to the first sidelink UE via the common SCI-1 402 or the common SCI-2 404 based on the number of subslots 340 in the second RP. For example, if the second RP includes Figure 4 As shown, two sub-timeslots 340(0) and 340(1) are included, the RP indicator may be carried by SCI-1 402. If the second RP includes more than two sub-timeslots 340, the RP indicator may be carried by SCI-2 404.

[0079] Figure 5 5 is a signaling diagram of a wireless communication method 500 according to some aspects of the present disclosure. The actions of the communication method 500 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other suitable components) of a communication device or other suitable means for performing the actions. For example, a wireless communication device such as UE 115, UE 120, or UE 600 may utilize one or more components to perform various aspects of the method 500, such as a processor 602, a memory 604, a side link resource pool module 608, a transceiver 610, a modem 612, and one or more antennas 616. A wireless communication device such as BS 105, CU 1210, DU 1230, RU 1240, and / or a network unit 700 may utilize one or more components to perform various aspects of the method 500, such as a processor 702, a memory 704, a side link resource pool module 708, a transceiver 710, a modem 712, and one or more antennas 716.

[0080] At action 502, UE 115j may send an indicator indicating a resource pool (RP) monitoring capability to UE 115k. In some aspects, 115j may be configured with the capability to monitor multiple resource pools simultaneously. For example, 115j may be configured with the capability to monitor all sub-time slots in one or more sub-time slots in a first RP and a second RP. 115j may be configured with computing resources (e.g., CPU capabilities, memory capabilities, etc.) and / or power resources (e.g., battery power, line power, etc.) sufficient to monitor all sub-time slots in the sub-time slots of the second RP. In some aspects, 115j may not be configured with sufficient computing resources and / or power resources to monitor all sub-time slots in the sub-time slots of the second RP. For example, 115j may be configured with computing resources sufficient to monitor only one sub-time slot in the sub-time slots of the second RP.

[0081] At action 504, network element 105 may send a configured grant for the first RP and the second RP to UE 115k and UE 115j. In this regard, network element 105 and UE 115j and UE 115k may operate in sidelink mode 1. Network element 105 may send a configured grant for the first RP and the second RP in an RRC message and / or a DCI message (e.g., a DCI-3 message, a DCI-1 message). The first RP may be associated with a time slot. The second may be associated with one or more sub-time slots. The first RP and the second RP may indicate time / frequency resources allocated to UE 115j and UE 115k. Frequency resources may include spectrum, frequency band, frequency sub-band, frequency sub-channel, resource element, resource block and / or frequency interleaving.

[0082] At action 506, UE 115k may determine the LBT failure rate. In some aspects, UE 115j may monitor the first RP and / or the second RP based on the interference level associated with UE 115k. UE 115k may want to send communications to UE 115j in an unlicensed (e.g., shared) band. UE 115k may be exposed to radio frequency interference from surrounding devices (e.g., other side link UEs, WiFi devices). The interference level may be high enough to prevent UE 115k from obtaining access to the COT channel at the beginning of the time slot. In response, UE 115k may perform one or more LBTs before one or more sub-time slots of the second RP to increase the probability of LBT success and obtaining COT. However, when the interference level is below a threshold, UE 115k is able to perform a successful LBT before the time slot boundary, thereby enabling UE 115k to obtain COT and send communications to UE 115j.

[0083] If the LBT is unsuccessful, the UE 115k may wait for a period of time (e.g., a backoff period) to perform another LBT. The number of unsuccessful LBTs within a certain period of time may indicate an LBT failure rate. When the LBT failure rate associated with a first RP (e.g., a full slot including 13 or 14 symbols) is greater than a threshold, the UE 115k may select a second RP having one or more sub-slots in order to have more opportunities to perform a successful LBT. Since the LBT is performed before a slot boundary or a sub-slot boundary, the second RP having one or more sub-slots may increase the number of times the UE 115k may attempt LBT to obtain a channel. When the LBT failure rate associated with the first RP is less than or equal to a threshold, the UE 115k may select the first RP. In some aspects, a failure rate threshold may be pre-configured in the UE 115k. Additionally or alternatively, the UE 115k may receive an LBT failure rate threshold from the network unit 105. In this regard, the UE 115k may receive the LBT failure rate threshold via a DCI, an RRC message, a PDCCH message, a PDSCH message, or other suitable communication.

[0084] At action 510, UE 115k may send an RP monitoring indicator to UE 115j to indicate to UE 115j to monitor or not monitor the second RP based on the LBT failure rate. For example, when UE 115k determines that the LBT failure rate is greater than a threshold, UE 115k may send an indicator for monitoring the first RP and the second RP. When UE 115k determines that the LBT failure rate is less than or equal to the threshold, UE 115k may send an indicator for monitoring only the first RP. In this regard, UE 115k may send an indicator for monitoring the second RP via an RRC message (e.g., an RRC reconfiguration message), an SCI-1 message, an SCI-2 message, a MAC-CE message, or other suitable communication. Additionally or alternatively, the network unit 105 may send an indicator to UE 115j to monitor or not monitor the second RP. In this regard, the network element 105 may send an indicator to the UE 115j to monitor or not monitor the second RP via a DCI, an RRC message, a PDCCH message, a PDSCH message, or other suitable communication.

[0085] At act 512 , UE 115 j may simultaneously monitor the first RP and the second RP based on receiving the indicator for monitoring both the first RP and the second RP at act 510 .

[0086] At action 514, UE 115k may perform a successful LBT (e.g., CAT 4 LBT, CAT 3 LBT, or CAT 2 LBT) prior to the timeslot or sub-timeslot.

[0087] At action 516, the UE 115k may select an RP. The UE 115k may select the first RP or the second RP based on the time at which the LBT was successful. For example, when the LBT was successful before the time slot, the UE 115k may select the first RP. When the LBT was not successful before the time slot but the subsequent LBT was successful before the sub-time slot, the UE 115k may select the second RP.

[0088] At action 516, UE 115k may send an RP indicator to UE 115j. In this regard, UE 115k may send an indicator of the selected RP to UE 115k using the SCI. In some aspects, the RP indicator may be a binary indicator (e.g., a single bit "0" or "1"). For example, an RP indicator value of "0" may indicate the use of a first RP, while an indicator of "1" may indicate the use of a second RP. Alternatively, an indicator value of "0" may indicate the use of a second RP, while an indicator of "1" may indicate the use of a first RP. In some aspects, the SCI-1 may indicate the selected RP using different cyclic redundancy check (CRC) scrambling of the SCI-1. By using a common SCI-1 and indicating a dynamic PSSCH length in the SCI-1, a low-capability sidelink UE is able to decode a full slot of the first RP and a leading subslot of the second RP (e.g., a subslot of the second RP having symbols overlapping with the leading symbol of the slot). By using a common SCI-1 and indicating a dynamic PSSCH length in the SCI-1, a high-capability sidelink UE monitoring both the first RP and the second RP may perform a single SCI-1 decode.

[0089] In some aspects, UE 115k may send the RP indicator via a common SCI-2 (e.g., common resources in the first RP and the second RP). In some aspects, the PSSCH carrying the SCI-2 in the first RP may share common resource elements (e.g., the same symbols and / or subchannels) with the PSSCH carrying the SCI-2 in the second RP. Since the time slot in the first RP carries only a single SCI-2, the first RP and the second RP may share a single set of common resources associated with the SCI-2. In this way, UE 115j may decode the SCI-2 using a single set of common resource elements. Sharing common resources between the time slot of the first RP and the leading subslot of the second RP for SCI-1 and / or SCI-2 may reduce computational resources and / or power consumption in UE 115j.

[0090] At action 520, the UE 115k may send a communication (e.g., a transport block) based on the RP indicator. At action 518, the UE 115k may send a PSCCH communication, a PSSCH communication, and / or a transport block via a first RP or a second RP based on the RP indicator. In this regard, when the first RP is indicated, the UE 115k may send a communication in a time slot. When the second RP is indicated, the UE 115k may send a communication in one or more sub-time slots. The UE 115k may send a communication in one or more sub-time slots indicated by the common SCI-1 and / or the common SCI-2. For example, after the UE 115k has performed a successful LBT, the UE 115k may send a communication in the next sub-time slot.

[0091] Figure 6 6 is a block diagram of an exemplary UE 600 according to some aspects of the present disclosure. UE 600 may be UE 115 or UE 120 in network 100 or 1200 as discussed above. As shown, UE 600 may include a processor 602, a memory 604, a sidelink resource pool module 608, a transceiver 610 (which includes a modem subsystem 612 and a radio frequency (RF) unit 614), and one or more antennas 616. These elements may be coupled to each other, for example, via one or more buses and communicate with each other directly or indirectly.

[0092] The processor 602 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 602 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0093] The memory 604 may include cache memory (e.g., cache memory of the processor 602), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state memory devices, hard drives, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some examples, the memory 604 includes a non-transitory computer-readable medium. The memory 604 may store instructions 606. The instructions 606 may include instructions that, when executed by the processor 602, cause the processor 602 to perform the various aspects of the present disclosure (e.g., FIGS. 3 to 4) described herein with reference to the UE 115. Figure 5Instructions 606 may also be referred to as code. The terms "instructions" and "code" should be broadly interpreted to include any type of computer-readable statements. For example, the terms "instructions" and "code" may refer to one or more programs, routines, subroutines, functions, processes, etc. "Instructions" and "code" may include a single computer-readable statement or multiple computer-readable statements.

[0094] The side link resource pool module 608 may be implemented via hardware, software, or a combination thereof. For example, the side link resource pool module 608 may be implemented as a processor, a circuit, and / or an instruction 606 stored in the memory 604 and executed by the processor 602. In some aspects, the side link resource pool module 608 may be used to monitor a first resource pool (RP) associated with a time slot. The side link resource pool module 608 may be used to monitor a second RP associated with one or more sub-time slots. The second RP may overlap at least partially with the first RP. The side link resource pool module 608 may be used to receive an indicator indicating a starting point from a second side link UE, the starting point being associated with the first RP or the second RP. The side link resource pool module 608 may be used to receive communications from a second side link UE based on the indicator.

[0095] As shown, the transceiver 610 may include a modem subsystem 612 and an RF unit 614. The transceiver 610 may be configured to communicate bidirectionally with other devices, such as the BS 105 and / or the UE 115. The modem subsystem 612 may be configured to modulate and / or encode data from the memory 604 according to a modulation and coding scheme (MCS) (e.g., a low-density parity check (LDPC) decoding scheme, a turbo decoding scheme, a convolutional decoding scheme, a digital beamforming scheme, etc.). The RF unit 614 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data from the modem subsystem 612 (for outbound transmissions) or transmissions originating from another source, such as the UE 115 or the BS 105. The RF unit 614 may be further configured to perform analog beamforming in conjunction with digital beamforming. Although shown as being integrated together in the transceiver 610, the modem subsystem 612 and the RF unit 614 may be separate devices that are coupled together to enable the UE 600 to communicate with other devices.

[0096] The RF unit 614 may provide modulated and / or processed data, such as a data packet (or more generally, a data message that may include one or more data packets and other information), to the antenna 616 for transmission to one or more other devices. The antenna 616 may also receive data messages sent from other devices. The antenna 616 may provide the received data message for processing and / or demodulation at the transceiver 610. The antenna 616 may include multiple antennas of similar or different designs to maintain multiple transmission links. The RF unit 614 may configure the antenna 616.

[0097] In some examples, the UE 600 may include multiple transceivers 610 that implement different RATs (e.g., NR and LTE). In some examples, the UE 600 may include a single transceiver 610 that implements multiple RATs (e.g., NR and LTE). In some examples, the transceiver 610 may include various components, where different combinations of the components may implement the RATs.

[0098] Figure 7 is a block diagram of an exemplary network unit 700 according to some aspects of the present disclosure. As discussed above, the network unit 700 may be a BS 105, a CU 1210, a DU 1230, or a RU 1240. As shown, the network unit 700 may include a processor 702, a memory 704, a side link resource pool module 707, a transceiver 710 (including a modem subsystem 712 and an RF unit 714), and one or more antennas 716. These elements may be coupled to each other, for example, via one or more buses and communicate with each other directly or indirectly.

[0099] The processor 702 may have various features as a particular type of processor. For example, these features may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 702 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0100] The memory 704 may include cache memory (e.g., cache memory of the processor 702), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid-state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some examples, the memory 704 may include a non-transitory computer-readable medium. The memory 704 may store instructions 706. The instructions 706 may include instructions that, when executed by the processor 702, cause the processor 702 to perform the operations described herein (e.g., FIGS. 3 to 4). Figure 5 Instructions 706 may also be referred to as codes, which may be broadly interpreted to include any type of computer-readable statements.

[0101] The side link resource pool module 708 may be implemented via hardware, software, or a combination thereof. For example, the side link resource pool module 708 may be implemented as a processor, circuit, and / or instruction 706 stored in the memory 704 and executed by the processor 702.

[0102] In some aspects, the side link resource pool module 708 may implement FIG. 3 to FIG. Figure 5 For example, the sidelink resource pool module 708 may be used to send a configured grant to a UE (e.g., UE 115, UE 120, or UE 600), the configured grant indicating at least one of the first RP or the second RP. The sidelink resource pool module 708 may be used to send an indicator to the UE to indicate monitoring of the second RP, wherein monitoring of the second RP associated with one or more sub-slots is based on the indicator.

[0103] Additionally or alternatively, the sidelink resource pool module 708 may be implemented in any combination of hardware and software, and in some implementations may involve, for example, the processor 702, memory 704, instructions 706, transceiver 710, and / or modem 712.

[0104] As shown, the transceiver 710 may include a modem subsystem 712 and an RF unit 714. The transceiver 710 may be configured to communicate bidirectionally with other devices, such as UE 115 and / or 600. The modem subsystem 712 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC decoding scheme, a turbo decoding scheme, a convolutional decoding scheme, a digital beamforming scheme, etc.). The RF unit 714 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data from the modem subsystem 712 (for outbound transmissions) or from another source, such as UE 115 or UE 600. The RF unit 714 may be further configured to perform analog beamforming in conjunction with digital beamforming. Although shown as being integrated together in the transceiver 710, the modem subsystem 712 and / or the RF unit 714 may be separate devices that are coupled together at the network unit 700 to enable the network unit 700 to communicate with other devices.

[0105] The RF unit 714 may provide modulated and / or processed data, such as a data packet (or more generally, a data message that may include one or more data packets and other information), to the antenna 716 for transmission to one or more other devices. For example, according to aspects of the present disclosure, this may include a configuration indicating multiple sub-slots within a time slot. The antenna 716 may also receive data messages sent from other devices and provide the received data messages for processing and / or demodulation at the transceiver 710. The antenna 716 may include multiple antennas of similar design or different designs to maintain multiple transmission links.

[0106] In some examples, the network unit 700 may include multiple transceivers 710 that implement different RATs (e.g., NR and LTE). In some examples, the network unit 700 may include a single transceiver 710 that implements multiple RATs (e.g., NR and LTE). In some examples, the transceiver 710 may include various components, where different combinations of components may implement the RATs.

[0107] Figure 8800 is a flow chart of a communication method 800 according to some aspects of the present disclosure. Various aspects of the method 800 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other suitable components) of a wireless communication device or other suitable means for performing these aspects. For example, a wireless communication device such as UE 115, UE 120, or UE 600 may utilize one or more components to perform various aspects of the method 800, and the one or more components are such as a processor 602, a memory 604, a side link resource pool module 608, a transceiver 610, a modem 612, and one or more antennas 616. The method 800 may employ mechanisms similar to those in networks 100 and 1200 and with respect to FIGS. 3 to 4. Figure 5 As illustrated, method 800 includes multiple enumerated aspects, but method 800 may include additional aspects before, after, and between the enumerated aspects. In some aspects, one or more of the enumerated aspects may be omitted or performed in a different order.

[0108] At action 810, method 800 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) monitoring a first resource pool (RP) associated with a time slot. The first side link UE may receive a configured grant (e.g., a dynamic grant) from a network element (e.g., BS 105, RU 1240, DU 1230, CU 1210, or network element 700), the configured grant indicating the first RP. In this regard, the first side link UE may operate in side link mode 1 and receive a configured grant for the first RP in an RRC message and / or a DCI message (e.g., a DCI-3 message, a DCI-1 message). The first RP may be associated with a time slot. The first RP may indicate a time / frequency resource allocated to the first side link UE. The frequency resources may include a spectrum, a frequency band, a frequency subband, a frequency subchannel, a resource element, a resource block, and / or a frequency interlace.

[0109] At action 820, method 800 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) monitoring a second resource pool (RP) associated with one or more sub-time slots. The first side link UE may receive a configured grant (e.g., a dynamic grant) from a network unit (e.g., BS 105, RU 1240, DU 1230, CU 1210, or network unit 700), which indicates a second RP. In this regard, the first side link UE may operate in side link mode 1 and receive a configured grant for the second RP in an RRC message and / or a DCI message (e.g., a DCI-3 message, a DCI-1 message). The second RP may be associated with one or more sub-time slots and / or time slots. In some aspects, a single configured grant may indicate a first RP and a second RP. In some aspects, a first configured grant may indicate a first RP, and a second configured grant may indicate a second RP. The second RP may indicate a time / frequency resource associated with one or more sub-time slots allocated to the first side link UE. A time resource may include one or more time subslots. A frequency resource may include a spectrum, a frequency band, a frequency subband, a frequency subchannel, a resource element, a resource block and / or a frequency interlace.

[0110] In some aspects, a time slot may be divided into sub-slots such that each sub-slot occupies a plurality of symbols within the time slot. For example, a time slot may include 2, 3, 4, or more sub-slots. In some instances, a time slot may include 14 symbols. A sub-slot may occupy 2, 3, 4, 5, 6, or more symbols. In some aspects, each sub-slot may occupy consecutive symbols (e.g., symbols 0-6 or symbols 7-13) within a time slot. By dividing the time slot into sub-slots, the second UE may increase the number of potential starting positions for the COT based on increasing the number of LBT processes that may be performed per time slot.

[0111] In some aspects, the second RP may at least partially overlap with the first RP (e.g., partially overlap in time). For example, one or more subslots may overlap only with symbols of the slots of the first RP. In other words, the symbols of the subslots of the second RP are not outside the symbols of the slots of the first RP. One or more subslots of the second RP may overlap with at least one leading symbol of the slots of the first RP. In some aspects, all symbols of the subslots of the second RP overlap with leading symbols of the slots of the first RP. For example, the subslots of the second RP may occupy symbol indices 0 to x, which overlap with symbol indices 0 to x of the slots of the first RP. In some aspects, one or more subslots of the second RP overlap with at least one trailing symbol of the slots of the first RP. For example, the subslots of the second RP may occupy symbol indices x to 13, which overlap with symbol indices x to 13 of the slots of the first RP. In some aspects, one or more subslots of the second RP may overlap with at least one trailing symbol of the slots of the first RP and at least one leading symbol of an adjacent slot. For example, a leading symbol of a subslot of the second RP may overlap with a trailing symbol of a slot of the first RP, and a trailing symbol of a subslot of the second RP may overlap with a leading symbol of another slot adjacent to the slot of the first RP.

[0112] Additionally or alternatively, the first RP may include a first slot, and the second RP may include a second slot. The leading symbol of the second slot may overlap with the trailing symbol of the first slot, and the trailing symbol of the second slot may overlap with the leading symbol of a third slot adjacent to the first slot.

[0113] In some aspects, the first side link UE may simultaneously monitor a first RP associated with a time slot and a second RP associated with one or more sub-time slots for PSCCH communication (e.g., SCI in PSCCH communication). In some aspects, the first side link UE may simultaneously monitor a first RP associated with a time slot and a second RP associated with one or more sub-time slots based on the number of one or more sub-time slots. The second RP may include one or more sub-time slots. The first side link UE may be configured with the ability to monitor all sub-time slots in one or more sub-time slots. For example, the first side link UE may be configured with computing resources (e.g., CPU capabilities, memory capabilities, etc.) and / or power resources (e.g., battery power, line power, etc.) sufficient to monitor all sub-time slots in one or more sub-time slots of the second RP. In some aspects, the first side link UE may not be configured with sufficient computing resources and / or power resources to monitor all sub-time slots in one or more sub-time slots in the second RP. For example, the first side link UE may be configured with computing resources sufficient to monitor only one sub-time slot in the sub-time slot.

[0114] In some aspects, the first RP and the second RP may share common resources associated with a physical sidelink feedback channel (PSFCH). For example, the PSFCH carrying HARQ feedback in the first RP may share common time resources (e.g., the same symbols and / or subchannels) with the PSFCH carrying HARQ feedback in the second RP. The first RP and the second RP may share a common PSFCH periodicity. In some aspects, the first RP and the second RP may share common frequency resources for the PSFCH. Additionally or alternatively, the frequency resources of the PSFCH in the first RP may be multiplexed (e.g., frequency division multiplexing) with the frequency resources of the PSFCH in the second RP. The first sidelink UE and the second sidelink UE may receive an indication of the first RP and the second RP in a configured grant (e.g., a dynamically configured grant) from a network unit (e.g., BS105, RU 1240, DU 1230, CU 1210, or network unit 700). The configured grant may indicate resource elements of a common SCI-1, a common SCI-2, and / or a common PSFCH.

[0115] At action 830, method 800 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) receiving an indicator from a second side link UE indicating selection of a first RP or a second RP. The second side link UE may select the first RP or the second RP based on the LBT failure rate. The first side link UE may receive an indicator from the second side link UE indicating the selected RP. In this regard, the first side link UE may receive a common SCI-1 (e.g., common resources in the first RP and the second RP) to indicate whether the selected RP is the first RP or the second RP. In some aspects, the first RP and the second RP may share common resources associated with side link control information (SCI). For example, a PSCCH carrying an SCI-1 in the first RP may share common resource elements (e.g., the same symbols and / or subchannels) with a PSCCH carrying an SCI-1 in the second RP. Since a time slot in the first RP carries only a single SCI-1, the first RP and the second RP may share a single set of common resources associated with the SCI-1. In this way, the first sidelink UE may decode SCI-1 using a single common set of resource elements.

[0116] The common SCI-1 may indicate the resources (e.g., AGC symbols, PSSCH length, subslot length) of the selected RP. In some aspects, the SCI-1 may indicate the selected RP as a code point, information element, or other suitable indicator. In some aspects, the indicator may be a binary indicator (e.g., a single bit "0" or "1"). For example, an indicator value of "0" may indicate the use of a first RP, while an indicator of "1" may indicate the use of a second RP. Alternatively, an indicator value of "0" may indicate the use of a second RP, while an indicator of "1" may indicate the use of a first RP. In some aspects, the SCI-1 may indicate the selected RP using different cyclic redundancy check (CRC) scrambling of the SCI-1. By using a common SCI-1 and indicating a dynamic PSSCH length in the SCI-1, a low-capability sidelink UE is able to decode the full slot of the first RP and the leading subslot of the second RP (e.g., a subslot of the second RP having symbols overlapping with the leading symbol of the slot). By using a common SCI-1 and indicating a dynamic PSSCH length in the SCI-1, a high-capability sidelink UE monitoring both the first RP and the second RP may perform a single SCI-1 decode.

[0117] The first side link UE may receive a common SCI-2 (e.g., common resources in the first RP and the second RP) to indicate whether the selected RP is the first RP or the second RP. In some aspects, the PSSCH carrying the SCI-2 in the first RP may share common resource elements (e.g., the same symbols and / or subchannels) with the PSSCH carrying the SCI-2 in the second RP. Since the time slot in the first RP carries only a single SCI-2, the first RP and the second RP may share a single set of common resources associated with the SCI-2. In this way, the first side link UE can decode the SCI-2 using a single set of common resource elements. Sharing common resources for SCI-1 and / or SCI-2 between the time slot of the first RP and the leading subslot of the second RP can reduce computing resources and / or power consumption in the first side link UE.

[0118] After the first side link UE decodes the common SCI-1, the first side link UE may need to know the number of PSSCH resources (e.g., the number of symbols) carrying the common SCI-2. The common SCI-1 may include an indication of the PSSCH resources carrying the common SCI-2 (e.g., the number of symbols). The first side link UE may receive an indicator of using the first RP or the second RP from the second side link UE via the common SCI-1 or the common SCI-2. The second side link UE may send an RP indicator to the first side link UE via the common SCI-1 or the common SCI-2 based on the number of sub-slots in the second RP. For example, if the second RP includes two sub-slots, the RP indicator may be carried by SCI-1. If the second RP includes more than two sub-slots, the RP indicator may be carried by SCI-2.

[0119] In some aspects, the first side link UE may monitor the first RP and / or the second RP associated with one or more sub-time slots based on the interference level associated with the second side link UE. The second side link UE may want to send communications to the first side link UE in an unlicensed (e.g., shared) band. The first side link UE may be exposed to radio frequency interference from surrounding devices (e.g., other side link UEs, WiFi devices). The interference level may be high enough to prevent the second side link UE from gaining access to the COT channel at the beginning of the time slot. In response, the second side link UE may perform one or more LBTs before one or more sub-time slots of the second RP to increase the probability of the LBT being successful and obtaining a COT. However, when the interference level is below a threshold, the second side link UE is able to perform a successful LBT before the time slot boundary, thereby enabling the second side link UE to obtain a COT and send communications to the first side link UE.

[0120] If the LBT is unsuccessful, the second side link UE may wait for a period of time (e.g., a backoff period) to perform another LBT. The number of unsuccessful LBTs within a certain period of time may indicate an LBT failure rate. When the LBT failure rate associated with the first RP (e.g., a full time slot including 13 or 14 symbols) is greater than a threshold, the second side link UE may select a second RP having one or more sub-time slots so as to have more opportunities to perform a successful LBT. Since the LBT is performed before the time slot boundary or the sub-time slot boundary, the second RP having one or more sub-time slots may increase the number of times the second side link UE may attempt LBT to obtain a channel. When the LBT failure rate associated with the first RP is less than or equal to the threshold, the second side link UE may select the first RP. In some aspects, the failure rate threshold may be pre-configured in the second side link UE. Additionally or alternatively, the second side link UE may receive the LBT failure rate threshold from the network unit. In this regard, the second side link UE may receive the LBT failure rate threshold via DCI, RRC message, PDCCH message, PDSCH message, or other suitable communication.

[0121] In some aspects, the first side link UE may receive an indicator from the second side link UE for monitoring or not monitoring the second RP based on the LBT failure rate. For example, when the second side link UE determines that the LBT failure rate is greater than a threshold, the first side link UE may receive an indicator for monitoring the first RP and the second RP. When the second side link UE determines that the LBT failure rate is less than or equal to the threshold, the first side link UE may receive an indicator for monitoring only the first RP. In this regard, the first side link UE may receive an indicator for monitoring the second RP from the first side link UE via an RRC message (e.g., an RRC reconfiguration message), an SCI-1 message, an SCI-2 message, a MAC-CE message, or other suitable communication. Additionally or alternatively, the first side link UE may receive an indicator for monitoring or not monitoring the second RP from a network unit. In this regard, the first side link UE may receive an indicator for monitoring or not monitoring the second RP from a network unit via a DCI, an RRC message, a PDCCH message, a PDSCH message, or other suitable communication.

[0122] At action 840, method 800 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) receiving a communication (e.g., a PSCCH communication, a PSSCH communication, a transport block) from a second side link UE via a first RP or a second RP based on the indicator. In this regard, when the first RP is indicated, the first side link UE may receive the communication in a time slot. When the second RP is indicated, the first side link UE may receive the communication in one or more sub-time slots. The first side link UE may receive the communication in one or more sub-time slots indicated by common SCI-1 and / or common SCI-2. The first side link UE may receive the communication after the second side link has performed a successful LBT (e.g., CAT 4 LBT, CAT 3 LBT, or CAT 2 LBT) before the time slot or sub-time slot.

[0123] Fig. 9 900 is a flow chart of a communication method 900 according to some aspects of the present disclosure. Various aspects of the method 900 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other suitable components) of a wireless communication device or other suitable means for performing these aspects. For example, a wireless communication device such as UE 115, UE 120, or UE 600 may utilize one or more components to perform various aspects of the method 900, and the one or more components are such as a processor 602, a memory 604, a side link resource pool module 608, a transceiver 610, a modem 612, and one or more antennas 616. The method 900 may employ mechanisms similar to those in networks 100 and 1200 and with respect to FIGS. 3 to 4. Figure 5 As illustrated, method 900 includes multiple enumerated aspects, but method 900 may include additional aspects before, after, and between the enumerated aspects. In some aspects, one or more of the enumerated aspects may be omitted or performed in a different order.

[0124] At action 910, method 900 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) performing a listen-before-talk (LBT) process in a shared (e.g., unlicensed) frequency band. The first side link UE may want to send communications to a second side link UE in an unlicensed (e.g., shared) frequency band. The first side link UE may be exposed to radio frequency interference from surrounding devices (e.g., other side link UEs, WiFi devices). The interference level may be high enough to prevent the first side link UE from gaining access to the COT channel at the beginning of a time slot. In response, the first side link UE may perform one or more LBTs before one or more sub-time slots of the second RP to increase the probability that the LBT is successful and obtains a COT. However, when the interference level is below a threshold, the first side link UE is able to perform a successful LBT before the time slot boundary, thereby enabling the first side link UE to obtain a COT and send communications to the second side link UE.

[0125] If the LBT is unsuccessful, the first side link UE may wait for a period of time (e.g., a backoff period) to perform another LBT. The number of unsuccessful LBTs within a certain period of time may indicate an LBT failure rate. When the LBT failure rate associated with a first RP (e.g., a full slot including 13 or 14 symbols) is greater than a threshold, the first side link UE may select a second RP having one or more sub-slots so as to have more opportunities to perform a successful LBT. Since the LBT is performed before the slot boundary or sub-slot boundary, the second RP having one or more sub-slots may increase the number of times the first side link UE may attempt LBT to obtain a channel. When the LBT failure rate associated with the first RP is less than or equal to the threshold, the first side link UE may select the first RP. In some aspects, a failure rate threshold may be pre-configured in the first side link UE. Additionally or alternatively, the first side link UE may receive an LBT failure rate threshold from a network unit. In this regard, the first side link UE may receive the LBT failure rate threshold via a DCI, an RRC message, a PDCCH message, a PDSCH message, or other suitable communication.

[0126] At action 920, method 900 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) selecting a first resource pool (RP) or a second RP based on the success of the LBT process, wherein the second RP overlaps at least partially with the first RP. The second side link UE may monitor the first RP associated with the time slot. The second side link UE may receive a configured grant (e.g., a dynamic grant) from a network element (e.g., BS 105, RU 1240, DU 1230, CU 1210, or network element 700), which indicates the first RP. In this regard, the second side link UE may operate in side link mode 1 and receive a configured grant for the first RP in an RRC message and / or a DCI message (e.g., a DCI-3 message, a DCI-1 message). The first RP may be associated with one or more time slots. The first RP may indicate the time / frequency resources allocated to the second side link UE. Frequency resources may include spectrum, frequency band, frequency sub-band, frequency sub-channel, resource element, resource block and / or frequency interlace.

[0127] The second side link UE may monitor a second resource pool (RP) associated with one or more sub-time slots. The second side link UE may receive a configured grant (e.g., a dynamic grant) from a network unit (e.g., BS105, RU 1240, DU 1230, CU 1210, or network unit 700), which indicates a second RP. In this regard, the second side link UE may operate in side link mode 1 and receive a configured grant for the second RP in an RRC message and / or a DCI message (e.g., a DCI-3 message, a DCI-1 message). The second RP may be associated with one or more sub-time slots and / or time slots. In some aspects, a single configured grant may indicate a first RP and a second RP. In some aspects, a first configured grant may indicate a first RP, and a second configured grant may indicate a second RP. The second RP may indicate a time / frequency resource associated with one or more sub-time slots allocated to the second side link UE. The time resource may include one or more sub-time slots. Frequency resources may include spectrum, frequency band, frequency sub-band, frequency sub-channel, resource element, resource block and / or frequency interlace.

[0128] In some aspects, a time slot may be divided into sub-slots such that each sub-slot occupies a plurality of symbols within the time slot. For example, a time slot may include 2, 3, 4, or more sub-slots. In some instances, a time slot may include 14 symbols. A sub-slot may occupy 2, 3, 4, 5, 6, or more symbols. In some aspects, each sub-slot may occupy consecutive symbols (e.g., symbols 0-6 or symbols 7-13) within a time slot. By dividing the time slot into sub-slots, the first UE may increase the number of potential starting positions for the COT based on increasing the number of LBT processes that may be performed per time slot.

[0129] In some aspects, the second RP may at least partially overlap with the first RP (e.g., partially overlap in time). For example, one or more subslots may overlap only with symbols of the slots of the first RP. In other words, the symbols of the subslots of the second RP are not outside the symbols of the slots of the first RP. One or more subslots of the second RP may overlap with at least one leading symbol of the slots of the first RP. In some aspects, all symbols of the subslots of the second RP overlap with leading symbols of the slots of the first RP. For example, the subslots of the second RP may occupy symbol indices 0 to x, which overlap with symbol indices 0 to x of the slots of the first RP. In some aspects, one or more subslots of the second RP overlap with at least one trailing symbol of the slots of the first RP. For example, the subslots of the second RP may occupy symbol indices x to 13, which overlap with symbol indices x to 13 of the slots of the first RP. In some aspects, one or more subslots of the second RP may overlap with at least one trailing symbol of the slots of the first RP and at least one leading symbol of an adjacent slot. For example, a leading symbol of a subslot of the second RP may overlap with a trailing symbol of a slot of the first RP, and a trailing symbol of a subslot of the second RP may overlap with a leading symbol of another slot adjacent to the slot of the first RP.

[0130] Additionally or alternatively, the first RP may include a first slot, and the second RP may include a second slot. The leading symbol of the second slot may overlap with the trailing symbol of the first slot, and the trailing symbol of the second slot may overlap with the leading symbol of a third slot adjacent to the first slot.

[0131] In some aspects, the second side link UE may simultaneously monitor a first RP associated with a time slot and a second RP associated with one or more sub-time slots for PSCCH communication (e.g., SCI in PSCCH communication). In some aspects, the second side link UE may simultaneously monitor a first RP associated with a time slot and a second RP associated with one or more sub-time slots based on the number of one or more sub-time slots. The second RP may include one or more sub-time slots. The second side link UE may be configured with the ability to monitor all sub-time slots in one or more sub-time slots. For example, the second side link UE may be configured with computing resources (e.g., CPU capacity, memory capacity, etc.) and / or power resources (e.g., battery power, line power, etc.) sufficient to monitor all sub-time slots in one or more sub-time slots of the second RP. In some aspects, the second side link UE may not be configured with sufficient computing resources and / or power resources to monitor all sub-time slots in one or more sub-time slots in the second RP. For example, the second side link UE may be configured with computing resources sufficient to monitor only one sub-time slot in the sub-time slot.

[0132] In some aspects, the first RP and the second RP may share common resources associated with a physical sidelink feedback channel (PSFCH). For example, the PSFCH carrying HARQ feedback in the first RP may share common time resources (e.g., the same symbols and / or subchannels) with the PSFCH carrying HARQ feedback in the second RP. The first RP and the second RP may share a common PSFCH periodicity. In some aspects, the first RP and the second RP may share common frequency resources for the PSFCH. Additionally or alternatively, the frequency resources of the PSFCH in the first RP may be multiplexed (e.g., frequency division multiplexing) with the frequency resources of the PSFCH in the second RP. The first sidelink UE and the second sidelink UE may receive an indication of the first RP and the second RP in a configured grant (e.g., a dynamically configured grant) from a network unit (e.g., BS105, RU 1240, DU 1230, CU 1210, or network unit 700). The configured grant may indicate resource elements of a common SCI-1, a common SCI-2, and / or a common PSFCH.

[0133] At action 930, method 900 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) may send an indicator indicating a selected first RP or a selected second RP to a second side link UE. The first side link UE may select the first RP or the second RP based on the LBT failure rate. The first side link UE may send an indicator indicating the selected RP to the second side link UE. In this regard, the first side link UE may send a common SCI-1 (e.g., common resources in the first RP and the second RP) to indicate whether the selected RP is the first RP or the second RP. In some aspects, the first RP and the second RP may share common resources associated with side link control information (SCI). For example, a PSCCH carrying an SCI-1 in a first RP may share common resource elements (e.g., the same symbols and / or subchannels) with a PSCCH carrying an SCI-1 in a second RP. Since a time slot in the first RP carries only a single SCI-1, the first RP and the second RP may share a single set of common resources associated with the SCI-1. In this way, the second sidelink UE can decode SCI-1 using a single common set of resource elements.

[0134] The common SCI-1 may indicate the resources (e.g., AGC symbols, PSSCH length, subslot length) of the selected RP. In some aspects, the SCI-1 may indicate the selected RP as a code point, information element, or other suitable indicator. In some aspects, the indicator may be a binary indicator (e.g., a single bit "0" or "1"). For example, an indicator value of "0" may indicate the use of a first RP, while an indicator of "1" may indicate the use of a second RP. Alternatively, an indicator value of "0" may indicate the use of a second RP, while an indicator of "1" may indicate the use of a first RP. In some aspects, the SCI-1 may indicate the selected RP using different cyclic redundancy check (CRC) scrambling of the SCI-1. By using a common SCI-1 and indicating a dynamic PSSCH length in the SCI-1, a low-capability sidelink UE is able to decode the full slot of the first RP and the leading subslot of the second RP (e.g., a subslot of the second RP having symbols overlapping with the leading symbol of the slot). By using a common SCI-1 and indicating a dynamic PSSCH length in the SCI-1, a high-capability sidelink UE monitoring both the first RP and the second RP may perform a single SCI-1 decode.

[0135] The first side link UE may send a common SCI-2 (e.g., common resources in the first RP and the second RP) to indicate whether the selected RP is the first RP or the second RP. In some aspects, the PSSCH carrying the SCI-2 in the first RP may share common resource elements (e.g., the same symbols and / or subchannels) with the PSSCH carrying the SCI-2 in the second RP. Since the time slot in the first RP carries only a single SCI-2, the first RP and the second RP may share a single set of common resources associated with the SCI-2. In this way, the second side link UE may decode the SCI-2 using a single set of common resource elements. Sharing common resources for SCI-1 and / or SCI-2 between the time slot of the first RP and the leading subslot of the second RP may reduce computational resources and / or power consumption in the second side link UE.

[0136] After the second side link UE decodes the common SCI-1, the second side link UE may need to know the number of PSSCH resources (e.g., the number of symbols) carrying the common SCI-2. The common SCI-1 may include an indication of the PSSCH resources carrying the common SCI-2 (e.g., the number of symbols). The first side link UE may send an indicator for using the first RP or the second RP from the second side link UE via the common SCI-1 or the common SCI-2. The first side link UE may send an RP indicator to the second side link UE via the common SCI-1 or the common SCI-2 based on the number of sub-slots in the second RP. For example, if the second RP includes two sub-slots, the RP indicator may be carried by SCI-1. If the second RP includes more than two sub-slots, the RP indicator may be carried by SCI-2.

[0137] In some aspects, the first side link UE may send an indicator to the second side link UE for monitoring or not monitoring the second RP based on the LBT failure rate. For example, when the first side link UE determines that the LBT failure rate is greater than a threshold, the first side link UE may send an indicator for monitoring the first RP and the second RP. When the first side link UE determines that the LBT failure rate is less than or equal to the threshold, the first side link UE may send an indicator for monitoring only the first RP. In this regard, the first side link UE may send an indicator for monitoring the second RP to the first side link UE via an RRC message (e.g., an RRC reconfiguration message), an SCI-1 message, an SCI-2 message, a MAC-CE message, or other suitable communication. Additionally or alternatively, the second side link UE may receive an indicator for monitoring or not monitoring the second RP from a network unit. In this regard, the second side link UE may receive an indicator for monitoring or not monitoring the second RP from a network unit via a DCI, an RRC message, a PDCCH message, a PDSCH message, or other suitable communication.

[0138] At action 940, method 900 includes a first side link UE (e.g., UE 115, UE 120, or UE 600) sending a communication to a second side link UE based on the indicator. The first side link UE may send a PSCCH communication, a PSSCH communication, and / or a transport block via a first RP or a second RP based on the indicator. In this regard, when the first RP is indicated, the first side link UE may send a communication in a time slot. When the second RP is indicated, the first side link UE may send a communication in one or more sub-time slots. The first side link UE may send a communication in one or more sub-time slots indicated by a common SCI-1 and / or a common SCI-2. The first side link UE may send a communication after the first side link has performed a successful LBT (e.g., CAT 4 LBT, CAT 3 LBT, or CAT 2 LBT) before the time slot or sub-time slot. For example, after the first side link has performed a successful LBT, the first side link UE may send a communication in the next sub-time slot.

[0139] Other aspects of the present disclosure include the following:

[0140] Aspect 1 includes a method for wireless communication performed by a first user side link equipment (UE), the method comprising: monitoring a first resource pool (RP) associated with a time slot; monitoring a second RP associated with one or more sub-time slots, wherein the second RP at least partially overlaps with the first RP; receiving an indicator indicating a starting point from a second side link UE, the starting point being associated with the first RP or the second RP; and receiving communication from the second side link UE based on the indicator.

[0141] Aspect 2 includes the method of aspect 1, further comprising: receiving a configured grant from a network element, the configured grant indicating at least one of the first RP or the second RP.

[0142] Aspect 3 includes the method according to any one of aspects 1 to 2, wherein monitoring the second RP associated with the one or more sub-timeslots is based on the number of the one or more sub-timeslots.

[0143] Aspect 4 includes a method according to any one of aspects 1 to 3, wherein monitoring the second RP associated with the one or more sub-time slots is based on an interference level associated with the second sidelink UE.

[0144] Aspect 5 includes a method according to any one of Aspects 1 to 4, wherein at least one of the following situations exists: the one or more sub-time slots overlap only with the symbols of the time slot; the one or more sub-time slots overlap with at least one leading symbol of the time slot; the one or more sub-time slots overlap with at least one trailing symbol of the time slot; or the one or more sub-time slots overlap with at least one trailing symbol of the time slot and at least one leading symbol of an adjacent time slot.

[0145] Aspect 6 includes a method according to any one of aspects 1 to 5, wherein the first RP and the second RP share common resources associated with sidelink control information (SCI).

[0146] Aspect 7 includes a method according to any one of aspects 1 to 6, wherein the first RP and the second RP share common resources associated with a physical sidelink feedback channel (PSFCH).

[0147] Aspect 8 includes the method according to any one of aspects 1 to 7, the method further comprising: receiving an indicator from a network element indicating monitoring of the second RP, wherein monitoring the second RP associated with the one or more sub-time slots is based on the indicator.

[0148] Aspect 9 includes a method for wireless communication performed by a first side link user equipment (UE), the method comprising: performing a listen-before-talk (LBT) process in a shared frequency band; based on the success of the LBT process, selecting a first resource pool (RP) or a second RP, wherein the second RP at least partially overlaps with the first RP; sending an indicator indicating a starting point to a second side link UE, the starting point being associated with the selected first RP or the selected second RP; and sending communication to the second side link UE based on the indicator.

[0149] Aspect 10 includes the method of aspect 9, wherein the first RP is associated with a time slot; and the second RP is associated with one or more sub-time slots.

[0150] Aspect 11 includes a method according to any one of Aspects 9 to 10, wherein selecting the first RP or the second RP includes further selecting the first RP or the second RP based on: a time period between a successful LBT process and a boundary of the time slot; or a time period between a successful LBT process and a boundary of a next sub-time slot of one or more time slots after the successful LBT process.

[0151] Aspect 12 includes a method according to any one of Aspects 9 to 11, the method further comprising: receiving a capability indicator indicating a capability level of the second side link UE from the second side link UE, wherein selecting the first RP or the second RP is based on the capability indicator.

[0152] Aspect 13 includes a method according to any one of Aspects 9 to 12, wherein at least one of the first RP and the second RP shares common resources associated with sidelink control information (SCI); or the first RP and the second RP share common resources associated with a physical sidelink feedback channel (PSFCH).

[0153] Aspect 14 includes a method according to any one of aspects 9 to 13, wherein selecting the first RP or the second RP includes selecting the second RP based on an LBT failure rate associated with the first sidelink UE satisfying a threshold.

[0154] Aspect 15 includes a method according to any one of Aspects 9 to 14, wherein selecting the first RP or the second RP includes selecting the second RP; and the method further includes: sending an RP indicator indicating the selection of the second RP to the second side link UE via at least one of the following: a radio resource control (RRC) message; sidelink control information (SCI); or a medium access control element (MAC-CE).

[0155] Aspect 16 includes a non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions including one or more instructions that, when executed by one or more processors of a first side link UE, cause the first side link UE to perform any one of aspects 1 to 8.

[0156] Aspect 17 includes a non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions including one or more instructions that, when executed by one or more processors of a first side link UE, cause the first side link UE to perform any one of aspects 9 to 15.

[0157] Aspect 18 includes a first sidelink user equipment (UE) comprising one or more means for performing any one or more of aspects 1-8.

[0158] Aspect 19 includes a first sidelink UE comprising one or more components for performing any one or more of aspects 9 to 15.

[0159] Information and signals may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0160] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0161] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored on a computer-readable medium or sent via a computer-readable medium as one or more instructions or codes. Other examples and specific implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software, hardware, firmware, hard wiring, or any combination thereof executed by a processor. The features that implement the functions may also be physically located at different locations, including being distributed so that the various parts of the functions are implemented at different physical locations. In addition, as used herein (including in the claims), the "or" used in the enumeration of items (e.g., followed by an enumeration of items such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that, for example, the enumeration of [at least one of A, B, or C] means: A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0162] As those skilled in the art will understand by now and depending on the specific application at hand, many modifications, substitutions and changes may be made to the materials, devices, configurations and methods of use of the apparatus of the present disclosure without departing from the spirit and scope of the present disclosure. In view of this, the scope of the present disclosure should not be limited to the scope of the specific examples illustrated and described herein (because they are only some examples thereof), but should be fully equivalent to the claims attached hereto and their functional equivalents.

Claims

1. A method of wireless communication performed by a first sidelink user equipment (UE), the method comprising: Monitoring a first resource pool (RP) associated with the time slot; monitoring a second RP associated with one or more sub-time slots, wherein the second RP at least partially overlaps with the first RP; receiving, from a second sidelink UE, an indicator indicating selection of the first RP or the second RP; as well as Communications are received from the second sidelink UE via the first RP or the second RP based on the indicator.

2. The method according to claim 1, further comprising: A configured grant is received from a network element, the configured grant indicating resources associated with at least one of the first RP or the second RP.

3. The method of claim 1, wherein monitoring the second RP associated with the one or more sub-timeslots is based on a number of the one or more sub-timeslots.

4. The method of claim 1, wherein monitoring the second RP associated with the one or more sub-time slots is based on an interference level associated with the second sidelink UE.

5. The method of claim 1, wherein at least one of the following conditions exists: The one or more sub-slots overlap only with symbols of the time slot; The one or more sub-time slots overlap with at least one preamble symbol of the time slot; The one or more sub-time slots overlap with at least one trailing symbol of the time slot; or The one or more sub-slots overlap with at least one post-leading symbol of the slot and at least one pre-leading symbol of an adjacent slot.

6. The method of claim 1, wherein the first RP and the second RP share common resources associated with sidelink control information (SCI).

7. The method of claim 1, wherein the first RP and the second RP share common resources associated with a physical sidelink feedback channel (PSFCH).

8. The method according to claim 1, further comprising: An indicator is received from a network element indicating monitoring of the second RP, wherein monitoring of the second RP associated with the one or more sub-timeslots is based on the indicator.

9. A method of wireless communication performed by a first sidelink user equipment (UE), the method comprising: Performing a listen-before-talk (LBT) process in a shared frequency band; Based on the LBT process being successful, selecting a first resource pool (RP) or a second RP, wherein the second RP at least partially overlaps with the first RP; sending an indicator indicating the selected first RP or the selected second RP to the second sidelink UE; as well as A communication is sent to the second sidelink UE based on the indicator.

10. The method according to claim 9, wherein: The first RP is associated with a time slot; and The second RP is associated with one or more sub-time slots.

11. The method of claim 10, wherein selecting the first RP or the second RP comprises selecting the first RP or the second RP further based on: the time period between a successful said LBT process and the boundary of said time slot; or The time period between a successful LBT process and the boundary of the next sub-slot of one or more time slots after a successful LBT process.

12. The method according to claim 9, further comprising: A capability indicator is received from the second sidelink UE indicating a capability level of the second sidelink UE, wherein selecting the first RP or the second RP is based on the capability indicator.

13. The method of claim 9, wherein at least one of the following conditions exists: The first RP and the second RP share common resources associated with sidelink control information (SCI); or The first RP and the second RP share common resources associated with a physical sidelink feedback channel (PSFCH).

14. The method of claim 9, wherein selecting the first RP or the second RP comprises selecting the second RP based on a LBT failure rate associated with the first sidelink UE satisfying a threshold.

15. The method of claim 9, wherein selecting the first RP or the second RP comprises selecting the second RP; and The method further comprises: and sending an RP indicator indicating selection of the second RP to the second sidelink UE via at least one of the following: Radio Resource Control (RRC) messages; Sidelink Control Information (SCI); or Medium Access Control Element (MAC-CE).

16. A first sidelink user equipment (UE), the first sidelink user equipment (UE) comprising: Memory; Transceiver; and at least one processor coupled to the memory and the transceiver, wherein the first sidelink UE is configured to: Monitoring a first resource pool (RP) associated with the time slot; monitoring a second RP associated with one or more sub-time slots, wherein the second RP at least partially overlaps with the first RP; receiving, from a second sidelink UE, an indicator indicating selection of the first RP or the second RP; as well as Communications are received from the second sidelink UE via the first RP or the second RP based on the indicator.

17. The first sidelink UE according to claim 16, wherein the first sidelink UE is further configured to: A configured grant is received from a network element, the configured grant indicating at least one of the first RP or the second RP.

18. The first sidelink UE according to claim 16, wherein the first sidelink UE is further configured to: The second RP associated with the one or more sub-timeslots is monitored based on the number of the one or more sub-timeslots.

19. The first sidelink UE according to claim 16, wherein the first sidelink UE is further configured to: The second RP associated with the one or more sub-slots is monitored based on an interference level associated with the second sidelink UE.

20. The first sidelink UE of claim 16, wherein at least one of the following conditions exists: The one or more sub-slots overlap only with symbols of the time slot; The one or more sub-time slots overlap with at least one preamble symbol of the time slot; The one or more sub-time slots overlap with at least one trailing symbol of the time slot; or The one or more sub-slots overlap with at least one post-leading symbol of the slot and at least one pre-leading symbol of an adjacent slot.

21. The first sidelink UE of claim 16, wherein the first RP and the second RP share common resources associated with sidelink control information (SCI).

22. The first sidelink UE of claim 16, wherein the first RP and the second RP share common resources associated with a physical sidelink feedback channel (PSFCH).

23. The first sidelink UE of claim 16, wherein the first sidelink UE is further configured to: receiving an indicator from a network element to monitor the second RP; and The second RP associated with the one or more sub-slots is monitored based on the indicator.

24. A first sidelink user equipment (UE), the first sidelink user equipment (UE) comprising: Memory; Transceiver; and at least one processor coupled to the memory and the transceiver, wherein the first sidelink UE is configured to: Performing a listen-before-talk (LBT) process in a shared frequency band; Based on the LBT process being successful, selecting a first resource pool (RP) or a second RP, wherein the second RP at least partially overlaps with the first RP; sending an indicator indicating the selected first RP or the selected second RP to the second sidelink UE; as well as A communication is sent to the second sidelink UE based on the indicator.

25. The first sidelink UE of claim 24, wherein: The first RP is associated with a time slot; and The second RP is associated with one or more sub-time slots.

26. The first sidelink UE of claim 25, wherein the first sidelink UE is further configured to: The first RP or the second RP is selected further based on: the time period between a successful said LBT process and the boundary of said time slot; or The time period between a successful LBT process and the boundary of the next sub-slot of one or more time slots after a successful LBT process.

27. The first sidelink UE of claim 24, wherein the first sidelink UE is further configured to: receiving, from the second sidelink UE, a capability indicator indicating a capability level of the second sidelink UE; and The first RP or the second RP is selected based on the capability indicator.

28. The first sidelink UE of claim 24, wherein at least one of the following conditions exists: The first RP and the second RP share common resources associated with sidelink control information (SCI); or The first RP and the second RP share common resources associated with a physical sidelink feedback channel (PSFCH).

29. The first sidelink UE of claim 24, wherein the first sidelink UE is further configured to: The second RP is selected based on an LBT failure rate associated with the first sidelink UE satisfying a threshold.

30. The first sidelink UE of claim 24, wherein the first sidelink UE is further configured to: selecting the second RP; and and sending an RP indicator indicating selection of the second RP to the second sidelink UE via at least one of the following: Radio Resource Control (RRC) messages; Sidelink Control Information (SCI); or Medium Access Control Element (MAC-CE).

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