Techniques for sidelink channel sensing with micro-slots

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive an indication of a first slot-related channel sensing procedure to be performed during channel sensing. The first slot dependent channel sensing process may be an available slot dependent channel sensing process of a plurality of available slot dependent channel sensing processes. The first slot-dependent channel sensing process may indicate a time interval delta at which the channel sensing is to be performed. The UE may perform the first slot dependent channel sensing procedure based on the indication. The UE may perform the first slot dependent channel sensing procedure in a sidelink resource pool with the time interval increments to identify first time-frequency resources of the sidelink resource pool available for transmission of sidelink messages.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. patent application No. 17 / 969,548, entitled “TECHNIQUES FOR SIDELINK CHANNEL SENSING WITH MINI-SLOTS,” filed by RYU et al. on October 19, 2022, which is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following relates to wireless communications, including techniques for sidelink channel sensing utilizing mini-slots. 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 may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more network entities, each of which supports wireless communication of communication devices, which may be referred to as user equipment (UE). Some communication systems may support a channel sensing process to identify available resources of a shared radio frequency spectrum band. In some cases, the prior art for the channel sensing process may be defective. Summary of the invention

[0005] The described technology relates to methods, systems, devices and apparatuses that support side link channel sensing for utilizing micro-time slots. For example, the described technology provides a framework for channel sensing processes that accommodate time slot-based and micro-time slot-based channel sensing (which may also be referred to as sub-time slot-based channel sensing). For example, a user equipment (UE) may receive an indication of a first time slot-related channel sensing process to be performed during channel sensing. The first time slot-related channel sensing process may be one of a plurality of available time slot-related channel sensing processes. In some examples, the first time slot-related channel sensing process may indicate a time interval increment according to which channel sensing is to be performed. The UE may perform the first time slot-related channel sensing process based on the indication. For example, the UE may perform a first time slot-related channel sensing process in a side link resource pool with the time interval increment to identify a first time-frequency resource of the side link resource pool that can be used for sending a side link message. The present disclosure may facilitate improvements to the side link channel sensing process, and there are other benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 and Figure 2 Each illustrates an example of a wireless communication system supporting a technique for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure.

[0007] Figure 3 , Figure 4 and Figure 5 Each illustrates an example of a timing diagram supporting a technique for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure.

[0008] Figure 6 An example of a process flow supporting techniques for sidelink channel sensing utilizing mini-slots in accordance with one or more aspects of the present disclosure is illustrated.

[0009] Figure 7 and Figure 8 A block diagram illustrating a device supporting techniques for sidelink channel sensing utilizing mini-slots in accordance with one or more aspects of the present disclosure is illustrated.

[0010] Fig. 9 A block diagram of a communications manager supporting techniques for sidelink channel sensing utilizing mini-slots is illustrated in accordance with one or more aspects of the present disclosure.

[0011] Fig.10

[0013] A diagram of a system including a device supporting techniques for sidelink channel sensing utilizing mini-slots is illustrated in accordance with one or more aspects of the present disclosure.

[0012] Figure 11 to Figure 12A flow chart illustrating a method of supporting techniques for sidelink channel sensing utilizing mini-slots in accordance with one or more aspects of the present disclosure is illustrated. DETAILED DESCRIPTION

[0013] Some wireless communication systems may include communication devices (such as user equipment (UE) and network entities) that support wireless communication using one or more radio access technologies (RATs). For example, the communication device may support wireless communication using one or more cellular RATs, such as fourth generation (4G) systems (e.g., long term evolution (LTE) systems) and fifth generation (5G) systems (e.g., new radio (NR) systems), as well as other generations of cellular RATs, including subsequent generations of cellular RATs. In some examples, such wireless communication systems may support sidelink communication using shared radio frequency spectrum bands (e.g., unlicensed radio frequency spectrum bands, unlicensed bands). The shared radio frequency spectrum band may be shared between the cellular RAT and one or more other RATs (such as Wi-Fi or Bluetooth, etc.). In such examples, before using the resources of the shared radio frequency spectrum band for transmission, the communication device may perform a channel sensing process.

[0014] For example, the UE may perform a channel sensing process to determine a set of time-frequency resources that can be used (or not used) for sidelink transmission. In some examples, a higher layer of the protocol stack at the UE (e.g., a medium access control (MAC) layer) may trigger a lower layer of the protocol stack (e.g., a physical (PHY) layer) to determine a set of available time-frequency resources from a resource pool. The resource pool may include multiple time-frequency resources that can be used for sidelink transmission. The lower layer may determine a set of available time-frequency resources from the resource pool based on sidelink control information (SCI) received from one or more other UEs. For example, the received SCI may indicate a time-frequency resource that can be reserved in the resource pool for sidelink transmission at other UEs. The reserved time-frequency resources may include a time slot or a portion of a time slot (e.g., a sub-slot, a micro-slot) in the time domain. That is, some UEs can send sidelink messages in increments of time slots or sub-slots. Although time slots are referenced throughout this disclosure, it should be understood that the techniques described herein may also be applied to other durations. However, in some examples, the channel sensing process may assume that the sidelink transmission occupies a time slot in the time domain. Therefore, the UE may be configured to perform a channel sensing process in slot-based increments. That is, the UE may be configured to exclude time-frequency resources reserved at other UEs in slot-based increments, regardless of whether the reserved time-frequency resources include slots or sub-slots. In some examples, performing channel sensing in slot-based increments may result in inefficient resource utilization within the wireless communication system.

[0015] Various aspects of the present disclosure generally relate to techniques for sidelink channel sensing utilizing sub-slots, and more specifically, to a framework for a channel sensing process that accommodates slot-based and sub-slot-based channel sensing. For example, a higher layer of a protocol stack at a UE may indicate to a lower layer of a protocol stack at the UE to determine resources for slot-based or sub-slot-based transmission. That is, the higher layer may indicate to the lower layer to use slots or sub-slots as increments to determine the time-frequency resources for sidelink transmission. In response, the lower layer may perform slot-based channel sensing or sub-slot-based channel sensing. For example, the UE may perform a channel sensing process in a sidelink resource pool in slot-based increments or sub-slot-based increments to identify the time-frequency resources of the sidelink resource pool that can be used for sidelink transmission. The UE may use the identified time-frequency resources to send a sidelink message.

[0016] Certain aspects of the subject matter described herein may be implemented to achieve one or more potential advantages. For example, the techniques employed by the described communication devices may provide benefits and enhancements to the operation of the communication devices, including improved channel sensing processes and improved resource utilization of shared radio frequency spectrum bands. In some specific implementations, the operations performed by the described communication devices to improve resource utilization include using a channel sensing process that accommodates slot-based and sub-slot-based channel sensing. In some other specific implementations, the operations performed by the described communication devices may also support increased throughput and higher data rates, and there are other benefits.

[0017] Various aspects of the disclosure are first described in the context of wireless communication systems. Various aspects of the disclosure are also described in the context of timing diagrams and process flows. Various aspects of the disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow charts related to techniques for sidelink channel sensing using mini-slots.

[0018] Figure 1 An example of a wireless communication system 100 supporting techniques for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating according to other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0019] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may include devices in different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, among other nomenclature. In some examples, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) within which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area within which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[0020] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communication with various types of devices, such as Figure 1 Communicate with other UEs 115 or network entities 105) as shown.

[0021] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from a second node.

[0022] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130) via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via midhaul communication links 162 (e.g., according to a midhaul interface protocol) or fronthaul communication links 168 (e.g., according to a fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0023] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a home Node B, a home evolved Node B, or other suitable terms). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, stand-alone) base station architecture, which may be configured to utilize a protocol stack physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0024] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0025] The functional split between CU 160, DU 165, and RU 170 is flexible and may support different functionalities, depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165 such that CU 160 may support one or more layers of a protocol stack and DU 165 may support one or more different layers of a protocol stack. In some examples, CU 160 may host higher protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 can be within the protocol layer (e.g., some functions of the protocol layer can be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by different ones of CU 160, DU 165, or RU 170). CU 160 can be further functionally split into CU control plane (CU-CP) and CU user plane (CU-UP) functions. CU 160 can be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and DU 165 can be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented based on interfaces (eg, channels) between layers of a protocol stack supported by respective network entities 105 that communicate via those communication links.

[0026] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DUs 165 or one or more RUs 170 may be controlled in part by one or more CUs 160 associated with a donor network entity 105 (e.g., donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a coupled IAB donor's DU 165. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0027] In the case where the techniques described herein are applied to the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support the techniques for sidelink channel sensing utilizing mini-slots as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 175, a SMO 180).

[0028] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0029] The UE 115 described herein may be capable of communicating with various types of devices such as other UEs 115 which may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 shown.

[0030] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a collection of RF spectrum resources having a physical layer structure defined for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any portion (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send," "receive," or "communicate" when referring to the network entity 105 may refer to any portion of a network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0031] The signal waveform transmitted via the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM techniques, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and the subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high order modulation scheme may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial resources may increase the data rate or data integrity used for communication with UE 115.

[0032] The time interval for the network entity 105 or the UE 115 may be expressed in multiples of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the supported subcarrier spacing, and N f The supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0033] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a certain number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a certain number of symbol periods (e.g., depending on the length of the cyclic prefix appended in front of each symbol period). In some wireless communication systems 100, the time slot may be further divided into a plurality of micro time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0034] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0035] Physical channels may be multiplexed according to various techniques in order to communicate using a carrier. For example, physical control channels and physical data channels may be multiplexed using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique to signal via a downlink carrier. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth of a carrier or a subset of that system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs in UE 115 may monitor or search a control region to obtain control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0036] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0037] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video, or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0038] In some examples, the UE 115 may be configured to support communication directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., a base station 140, a RU 170), which may support aspects of such D2D communication configured (e.g., scheduled) by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105.

[0039] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity for managing access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity for routing packets or interconnecting to an external network (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered through user plane entities, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 of one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0040] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength ranges from about one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide services to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than communications using the lower frequencies and longer wavelengths of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0041] The wireless communication system 100 may utilize licensed and unlicensed RF spectrum bands. For example, the wireless communication system 100 may use unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology. When operating using unlicensed RF spectrum bands, devices such as network entity 105 and UE 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations performed using unlicensed bands may be based on carrier aggregation configuration (e.g., LAA) in conjunction with component carriers operating using licensed bands. Operations performed using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0042] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels, which can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a collection of multiple rows and columns of antenna ports that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0043] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other direction).

[0044] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly to communicate via logical channels. The MAC layer may perform priority processing and multiplexing of logical channels into transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection that supports a radio bearer for user plane data between the UE 115 and the network entity 105 or the core network 130. The PHY layer may map a transport channel to a physical channel.

[0045] In some examples, the wireless communication system 100 may support a framework for channel sensing processes that accommodate time slot-based and sub-time slot-based channel sensing. For example, the UE 115 may receive an indication of a first time slot-related channel sensing process to be performed during channel sensing. The first time slot-related channel sensing process may be an available time slot-related channel sensing process among multiple available time slot-related channel sensing processes. In some examples, the first time slot-related channel sensing process may indicate a time interval increment according to which channel sensing is to be performed. The UE 115 may perform the first time slot-related channel sensing process based on the indication. For example, the UE 115 may perform the first time slot-related channel sensing process in the side link resource pool with the time interval increment to identify the first time-frequency resource of the side link resource pool that can be used for sending a side link message. In some examples, using the first time slot-related channel sensing process to perform during channel sensing may enable the UE 115 to improve resource utilization within the wireless communication system 100, and there are other benefits.

[0046] Figure 2 An example of a wireless communication system 200 that supports techniques for sidelink channel sensing using mini-slots according to one or more aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may include UE 215-a, UE 215-b, and UE 215-c, which may be reference UEs. Figure 1 An example of a UE 115 is described. Figure 2 In the example of , UE 215 can use one or more side links 210 (e.g., PC5 interface) to communicate. In some examples, one or more side links 210 (e.g., side link 210-a, side link 210-b) can be as shown in reference Figure 1 An example of a D2D communication link 135 is described.

[0047] In some examples, the wireless communication system 200 (e.g., a UE-to-UE network) may support one or more modes for sidelink communications. For example, the wireless communication system 200 may support mode 1 sidelink operation and mode 2 sidelink operation, as well as other examples of sidelink operation modes. As described herein, mode 1 sidelink operation may refer to a sidelink operation in which a network entity (e.g., a gNB) may be used to schedule or configure resource allocations (e.g., for sidelink communications). That is, for a mode 1 sidelink, resource utilization may be determined at the network entity. Additionally or alternatively, as described herein, mode 2 sidelink operation may refer to a sidelink operation in which a sensing process performed (e.g., autonomously) at a UE 215 (e.g., a transmitting UE) may be used to determine resource allocations (e.g., for sidelink communications). That is, in some examples, channel sensing may be used for sidelink communications, such as a mode 2 sidelink. In some examples of Mode 2 sidelink operation, a transmitting UE may perform channel sensing to determine one or more resources that may be reserved at one or more other (e.g., nearby) transmitting UEs, and select one or more resources for transmission (e.g., sidelink transmission) at the transmitting UE based on the channel sensing. Some channel sensing methods may be designed with the assumption that UEs (e.g., all sidelink transmitting UEs) may use (e.g., reserve) resources in increments of a particular duration to transmit sidelink communications. For example, some channel sensing processes may be based on the assumption that UE 215 may use time slots (e.g., full time slots, sidelink time slots, some other suitable duration) to transmit sidelink communications.

[0048] like Figure 2As illustrated in the example of , UE 215-a may perform a channel sensing process to determine (e.g., identify) resources for transmission of a sidelink message 225. In some examples of the channel sensing process, in order to determine the available resources in the resource window used at the UE, the UE may receive and decode one or more SCIs from one or more other UEs (e.g., any nearby transmitting UEs). For example, UE 215-a may receive SCI 220-b from UE 215-c. In some examples, SCI 220-b may include resource reservations. Additionally or alternatively, SCI 220-b may include a priority for transmissions to be performed in the reserved resources (or multiple reserved resources). For example, SCI 220-b may include a resource reservation that may indicate one or more resources reserved for sidelink transmissions at UE 215-c. Additionally or alternatively, SCI 220-b may include a priority associated with a sidelink transmission to be performed at UE 215-c using the reserved resources. In some examples, UE 215-a may receive SCI 220-b from UE 215-c at a received power (e.g., reference signal received power (RSRP)) that may satisfy a threshold (e.g., exceed a threshold). In such examples, UE 215-a may determine that resources reserved using SCI 220-b may not be available for UE 215-a to use to send a sidelink message (such as sidelink message 225). In some examples, the threshold may depend on a priority associated with a sidelink transmission to be performed at UE 215-c (e.g., using resources reserved using SCI 220-b). Additionally or alternatively, the threshold may depend on another priority associated with a sidelink transmission to be performed at UE 215-a (e.g., an intended transmission, such as sidelink message 225).

[0049] In some examples, SCI 220-b (and other SCIs, such as SCI 220-a) may include one or more fields for indicating resource reservation. For example, SCI 220-b may include a TRA (time resource assignment) field and a FRA (frequency resource assignment) field, which may indicate (e.g., reserve) the amount of resources to be used at UE 215-c. That is, the TRA field may indicate the amount (and location) of resources in the time domain, and the FRA may indicate the amount (and location) of resources in the frequency domain. In some examples, the amount of resources indicated using SCI 220-b (or SCI 220-a) may be determined based on a parameter such as an sl-MaxNumPerReserve-r16 resources information element (IE). It should be understood that the names of the IEs and fields described herein may change based on the specific implementation of one or more devices (e.g., one or more of UE 215), and the examples described herein should not be considered to be limited to the scope covered by the claims or the present disclosure. In some examples, the amount of resources (e.g., 2 or 3 resources) may include one or more resources to be used for a transmission (e.g., a current transmission) that includes the SCI. For example, UE 215-c may transmit SCI 220-b using one or more resources reserved at UE 215-c and indicated using SCI 220-b. In some examples, the TRA field or the FRA field may be used to reserve an amount of resources for retransmissions (e.g., up to about 2 or some other suitable amount of retransmission resources). In such examples, the reserved retransmission resources may occur a number of time slots (e.g., up to about 31 time slots or some other suitable number of time slots) after the time slot in which the SCI may be transmitted (e.g., a number of time slots in the future).

[0050] Additionally or alternatively, the SCI may include an RRI (resource reservation interval) field that can be used to reserve periodic resources. For example, the RRI field may indicate a periodic resource to be used at the UE to send a periodic sidelink message (e.g., for sending a transport block in each periodic resource). That is, the RRI field can be used to reserve a set of periodic resources for multiple transport blocks. In some examples, the periodicity indicated by the RRI field can be configured at the UE. For example, the periodicity can be one of multiple periodicities configured at the UE (e.g., an enabled periodicity indicated by a parameter such as sl-ResourceReservePeriodList IE). In some examples, if one or more parameters are enabled at the UE, reservation of periodic resources may occur (e.g., enabled, allowed). For example, the sl-multiTBReserve IE can be used to enable reservation of periodic resources. In some examples, enabling reservation of periodic resources using the sl-ResourceReservePeriodList IE may be based on whether another parameter indicates an enabled state, such as whether the sl-multiTBReserve IE is enabled.

[0051] In some examples, UE 215 may be configured to use multiple types of time slots (e.g., multiple types of time slot formats) for sidelink transmission. For example, both time slots (e.g., full time slots) and mini-time slot transmissions may be enabled for sidelink communication at UE 215. As described herein, a mini-time slot (which may also be referred to as a sub-time slot) may correspond to a portion of a time slot. For example, a time slot may be divided into multiple mini-time slots. That is, UE 215 may use one time slot or one or more mini-time slots (e.g., one or more portions of a time slot) to transmit sidelink communication. In some examples, a mini-time slot may include a certain number (e.g., one or more) of symbol periods. In such examples, the number of symbol periods may be configured at UE 215-a. For example, UE 215-a may receive control signaling from a network entity, which indicates the number of symbol periods included in a mini-time slot (such as mini-time slot 260-a and mini-time slot 260-b). In such an example, UE 215-a may use time slot 255-a to transmit sidelink message 225. Additionally or alternatively, UE 215-a may use one or both of mini-slot 260-a and mini-slot 260-b (e.g., included in time slot 255-b) to send sidelink message 225. In such an example, the duration of mini-slot 260 may be reduced relative to time slot 255. Additionally or alternatively, mini-slot 260-a and mini-slot 260-b may include data (e.g., may be used to send data), such as via a physical sidelink shared channel (PSSCH). Additionally or alternatively, mini-slot 260-a and mini-slot 260-b may include control information (e.g., may be used to send control information), such as via a physical sidelink control channel (PSCCH). Figure 2 As illustrated in the example of , the mini-slot 260-a and the mini-slot 260-b (e.g., each mini-slot) may include corresponding PSCCH symbols 235. For example, the mini-slot 260-a may include PSCCH symbols 235 with indices 1 and 2, while the mini-slot 260-b may include PSCCH symbols 235 with indices 7 and 8. Additionally or alternatively, the mini-slot 260-a and the mini-slot 260-b (e.g., each mini-slot) may include one or more PSSCH symbols 245.

[0052] In some examples, a transmitting UE may use one or more (e.g., two) mini-time slots for transmission. For example, a transmitting UE (e.g., UE 215-a) may use multiple mini-time slots to transmit to multiple receiving UEs (e.g., each mini-time slot may be used to transmit a side link message to a different receiving UE). For example, UE 215-a may use a first mini-time slot (e.g., mini-time slot 260-a) to transmit a first side link message to a first receiving UE (e.g., UE 215-b), and use a second mini-time slot (e.g., mini-time slot 260-b) to transmit a second side link message to a second receiving UE (e.g., UE 215-c). In this example, UE 215-a may use multiple beams to transmit a first side link message and a second side link message. For example, UE 215-a may use a first beam to transmit a first side link message to UE 215-b (e.g., using mini-time slot 260-a), and use a second beam to transmit a second side link message to UE 215-c (e.g., using a second mini-time slot). In some examples, UE 215-a may use gap symbol 250 to switch between a first beam (e.g., a beam used to send a sidelink message to UE 215-b) and a second beam (e.g., a beam used to send a sidelink message to UE 215-c). For example, gap symbol 250 may occur between consecutive mini-slot transmissions for beam switching (e.g., at the transmitting UE, UE 215-a). Figure 2 As illustrated in the example of , the gap symbol 250 with index 5 may occur between the mini-slot 260-a and the mini-slot 260-b. Additionally or alternatively, the gap symbol 250 may occur at the end of the sidelink slot (e.g., the gap symbol may be the last symbol allocated for the sidelink). For example, slot 255 may include a corresponding gap symbol 250 with index 13. In some examples, a transmitting UE performing full-slot sidelink transmission may use one or more gap symbols 250 (e.g., middle gap symbols, such as gap symbol 250 with index 5) to send PSSCH. In such examples, the transmitting UE may refrain from sending PSSCH using gap symbols 250 occurring at the end of the sidelink slot (e.g., gap symbol 250 with index 13).

[0053] In some examples, time slots and mini-slots may be used in the same resource pool. In such examples, time slots 255 may include automatic gain control (AGC) symbols. For example, within time slots 255, one or more AGC symbols 230 may be allocated. In some examples, an AGC symbol 230 (e.g., each AGC symbol 230) may correspond to the beginning of a time slot or a mini-slot. For example, within a side link time slot (e.g., time slot 255-a), a transmitting UE (e.g., UE 215-a) may perform a full-slot side link transmission (e.g., starting from the first symbol allocated for the side link and ending at the last symbol allocated for the side link). In such examples, a UE (e.g., UE 215-b) receiving a full-slot side link transmission may use the AGC symbol (e.g., in each AGC symbol) to adjust (e.g., readjust) the AGC at UE 215-b. Additionally or alternatively, a transmitting UE (e.g., UE 215-a) may perform one or more mini-slot side link transmissions. In such an example, a UE (e.g., UE 215-b) receiving a mini-slot sidelink transmission may use the AGC symbol at the beginning of the mini-slot to adjust the AGC at UE 215-b for the mini-slot. For example, UE 215-b may use AGC symbol 230 with index 0 to adjust the AGC at UE 215-b for the mini-slot 260-a. Additionally or alternatively, UE 215-b may use AGC symbol 230 with index 6 to adjust the AGC at UE 215-b for the mini-slot 260-b.

[0054] In some examples, the first symbol (e.g., the first OFDM symbol) of the PSSCH and the associated PSCCH may be duplicated. Additionally or alternatively, the first symbol (e.g., the first OFDM symbol) of the PSFCH may be duplicated. In such examples, the first symbol of the PSSCH may be a copy of the second symbol (e.g., the second OFDM symbol) and may be used as an AGC symbol. For example, the AGC symbol 230 with index 0 may correspond to the beginning of the mini-slot 260-a, and the AGC symbol 230 with index 6 may correspond to the beginning of the mini-slot 260-b. In such an example, the AGC symbol 230 with index 0 may be a copy of the PSSCH symbol 245 with index 1. Additionally or alternatively, the AGC symbol 230 with index 6 may be a copy of the PSSCH symbol 245 with index 7. In some examples, using the first symbol of the PSSCH as an AGC symbol may enable UE 215-b (e.g., a receiving UE) to adjust the AGC setting prior to receiving and decoding the PSSCH, which may begin at the second symbol of the PSSCH (e.g., the second OFDM symbol). For example, prior to receiving and decoding the PSSCH symbol 245 with index 1, UE 215-b may use AGC symbol 230 with index 0 to adjust the AGC setting at UE 215-b. In some examples, one or more other symbols (e.g., one or more symbols different from the first OFDM symbol) may be used at UE 215-b to adjust the AGC. For example, adjusting the AGC during a first portion (e.g., half) of a time slot may affect phase continuity associated with a second portion of the time slot. In such an example, the UE may use DMRS symbol 240 to estimate (e.g., re-estimate) the channel.

[0055] like Figure 2 As illustrated in the example of , UE 215-a (e.g., a sidelink transmitting UE) may use one or more fields (e.g., TRA field, FRA field, RRI field) included in SCI 220-a to reserve resources, such as mini-slot resources. That is, UE 215-a may send SCI 220-a, which may indicate resource reservation for one or more mini-slots. In some examples, UE 215-a may intend to use one or more of the reserved mini-slots to send side link message 225. In such examples, SCI 220-b may include one or more other fields (e.g., additional fields) that may be used to specify which mini-slot (e.g., among multiple mini-slots included in a time slot) may be reserved.

[0056] In some examples, full-slot transmissions and mini-slot transmissions may occur in the same resource pool. For example, UE 215 may use the same resource pool for sidelink transmissions using time slots and sidelink transmissions using mini-slots. In such examples, UE 215-a may intend to use time slots for transmission, and therefore may select time slot resources (e.g., time slot transmission resources, time slot 255-a) that do not overlap with reserved resources (e.g., reserved mini-slot resources or reserved time slot resources) (such as resources reserved at UE 215-c). Additionally or alternatively, UE 215-a may intend to use mini-slots for transmission, and therefore may select mini-slots (e.g., mini-slot transmission resources, mini-slot 260-a or mini-slot 260-b) that do not overlap with reserved mini-slots or full-slot resources. However, in some examples, if the first of mini-time slot 260-a and mini-time slot 260-b is reserved for transmission at another UE (e.g., UE 215-c), UE 215-a may not be able to use the second of mini-time slot 260-a and mini-time slot 260-b, regardless of whether the second of mini-time slot 260-a and mini-time slot 260-b is reserved. For example, if UE 215-c reserves mini-time slot 260-a (e.g., a mini-time slot that occurs earlier in time within time slot 255-b), mini-time slot 260-b (e.g., a mini-time slot that occurs later in time within time slot 255-b) is available for use at another UE. However, according to some channel sensing procedures, UE 215-a may be configured to determine whether resources are available in increments of time slots. Thus, if mini-slot 260-a is reserved, UE 215-a may determine that mini-slot 260-a and mini-slot 260-b (e.g., full slot, slot 255-b) may not be available for use at UE 215-a. That is, for some channel sensing processes, UE 215-a may be configured to exclude a slot (e.g., an entire side link slot, slot 255-b), regardless of whether a received SCI (e.g., SCI 220-b) reserves a mini-slot within slot 255-b (e.g., a single mini-slot, one of mini-slot 260-a and mini-slot 260-b) and regardless of whether UE 215-a intends to use the mini-slot for transmission.

[0057] Techniques for sidelink channel sensing utilizing microslots as described herein may support microslots and sidelink channel sensing. For example, such techniques may include one or more modifications to other channel sensing processes so that the channel sensing process can adapt to the microslots in the sidelink. In some examples, some techniques for sidelink channel sensing utilizing microslots as described herein may enable UE 215-a to use one of microslots 260-a and microslots 260-b included in slot 255-b, regardless of whether the other of microslots 260-a and microslots 260-b is reserved at another UE. For example, a UE may be configured with a process for determining resources (e.g., resource sets, resource subsets) to report to one or more higher layers (e.g., at the UE) for resource selection (e.g., PSSCH resource selection) (e.g., for mode 2 sidelink operation) under sidelink resource allocation mode 2. In some examples of resource allocation mode 2, a higher layer (e.g., a MAC layer) may request the UE to determine a resource subset from which the higher layer may select resources for sidelink transmission (e.g., PSSCH transmission or PSCCH transmission). In some examples, in order to trigger the UE to determine a resource subset (e.g., trigger a channel sensing process, such as in a certain number (n) of time slots), the higher layer may provide (e.g., to a lower layer at the UE, a PHY layer) one or more parameters for sidelink transmission. In some examples, a parameter of the one or more parameters may indicate (e.g., correspond to) a resource pool from which the UE may determine a resource subset (e.g., resources to be reported to the higher layer). Additionally or alternatively, another parameter may indicate a priority associated with the sidelink transmission (e.g., a Layer 1 (L1) priority, such as may be indicated using a parameter prio TX In some examples, a parameter of the one or more parameters may indicate a packet delay budget to be used for sidelink transmissions (e.g., a remaining packet delay budget), and another parameter may indicate a number of frequency resources (e.g., subchannels, such as may be indicated using parameter L) to be used for sidelink transmissions (e.g., in a time slot or mini-time slot). subCH Additionally or alternatively, a parameter in the one or more parameters may indicate an RRI (eg, such as a parameter p rsvp_TX ). In some examples, the RRI may be indicated in ms (or some other suitable unit).

[0058] In some examples, UE 215-a may determine whether to perform channel sensing process 205 for sidelink transmission using time slots (e.g., time slot-based channel sensing) or to perform the channel sensing process for sidelink transmission using mini-time slots (e.g., mini-time slot-based channel sensing) based on indications provided by one or more higher layers at UE 215-a. For example, a higher layer (e.g., a MAC layer) at UE 215-a may determine the number of resources to be used for sidelink transmission (e.g., transmission of sidelink message 225) at UE 215-a. The higher layer may indicate the number or resources (e.g., and one or more other parameters) to a lower layer (e.g., a PHY layer). Additionally or alternatively, the higher layer may indicate (e.g., in addition to the number of resources and the one or more other parameters) whether UE 215-a may determine resources for sidelink transmission using time slots or sidelink transmission using mini-time slots (e.g., for full-time slot transmission or mini-time slot transmission). In such an example, if the higher layer instructs UE 215-a to determine resources for sidelink transmission using mini-slots, the higher layer may specify which mini-slot (e.g., which of the first mini-slot or the second mini-slot) is to be used for sidelink transmission. That is, the higher layer may instruct UE 215-a to determine resources for mini-slot transmission, which include the first mini-slot (e.g., the mini-slot that occurs earlier in time within the corresponding time slot, such as mini-slot 260-a) or the second mini-slot (e.g., the mini-slot that occurs later in time within the corresponding time slot, such as mini-slot 260-b).

[0059] In some examples, higher layers may request UE 215-a to determine a subset of resources from which the higher layers may select resources for sidelink transmission as part of a re-evaluation or preemption process. In such examples, the higher layers may provide a first set of resources (r 0 ,r 1 ,r 2 , ...) (which may be subject to re-evaluation) and a second set of resources (r′ 0 ,r′ 1 ,r′ 2 , ...) (which may be subject to preemption). Additionally or alternatively, in such examples, UE 215-a may be in time slot (r″ i -T 3 ) before or after determining the resource subset as requested by higher layers (e.g., based on UE specific implementation), where r″ i May correspond to the first resource set (r 0 ,r 1 ,r 2 ,…) and the second resource set (r′ 0 ,r′ 1 ,r′ 2 ,…), and T3 may correspond to the number of time slots that can be determined according to a parameter . In some examples, may depend on another parameter μ SL , which may correspond to the subcarrier spacing configuration associated with the sidelink BWP (e.g., to be used for sidelink transmission). In some examples, the higher layer may use the allowedResourceSelectionConfig IE to provide an indication of the resource selection mechanism(s), and this IE may include full sensing, partial sensing, random resource selection, or any combination thereof.

[0060] In some examples, UE 215-a may be configured with one or more rules for performing the channel sensing procedure 205. For example, UE 215-a may be configured to exclude a candidate resource from a set of resources if the candidate resource (e.g., a single time slot resource or a single mini-slot resource) meets one or more conditions. In some examples, if UE 215-a receives an SCI (e.g., SCI format 1-A) in a time slot or mini-slot and the first field (e.g., the 'Resource reservation period' field) and the second field (e.g., the 'Priority' field) included in the SCI respectively indicate P rsvp_RX and prio RX for some values, then UE 215-a may exclude the candidate resource. Additionally or alternatively, if the RSRP measurement of the received SCI performed at UE 215-a meets (e.g., is higher than) a threshold (e.g., TH(p i ,P j ))), then UE 215-a may exclude the candidate resource.

[0061] In some examples, the one or more rules may indicate the steps to be performed at UE215-a as part of the channel sensing procedure 205. For example, the rules may indicate that candidate resources for transmission (e.g., candidate single time slot resources, candidate single mini-slot resources) may include (e.g., L subCH ) a set of consecutive subchannels, and this set of consecutive subchannels includes the subchannels (x + j) in a time slot or mini-slot, where j = 0,..., L subCH -1. UE 215-a may assume that the set of L subCH consecutive subchannels is included in the corresponding resource pool corresponding to the candidate resource within the time interval [n + T 1 , n + T 2 (if UE215-a is performing full sensing), and within the time interval [n + T 1 , n + T 2] corresponding to the candidate resources in a set of Y candidate time slots or mini-time slots (if the UE is performing periodic partial sensing), or in the time interval [n+T 1 ,n+T 2 ] (if UE 215-a is performing continuous partial sensing, e.g., if P rsvp_RX =0).

[0062] like Figure 2 As illustrated in the example of , UE 215-a may perform a channel sensing process 205 (e.g., a slot-dependent channel sensing process) in response to receiving an indication of a slot-dependent channel sensing process from a higher layer at UE 215-a. For example, UE 215-a may receive, at a lower layer, from a higher layer, an indication of a slot-dependent channel sensing process to be performed at UE 215-a during channel sensing. The slot-dependent sensing process may be one of a plurality of available slot-dependent channel sensing processes at UE 215-a. Additionally or alternatively, the slot-dependent channel sensing process may indicate a time interval increment at which UE 215-a may perform channel sensing. For example, the slot-dependent channel sensing process may indicate a time interval increment that may include a slot length or a microslot length. In this example, UE 215-a may sense potentially available time slots or mini-slots using the indicated time interval increments based on whether a higher layer (e.g., MAC layer) instructs UE 215-a to use a time slot length or a mini-slot length to perform channel sensing.

[0063] For example, the slot-dependent channel sensing process may indicate to the UE 215-a whether to perform one of slot-based channel sensing or sub-slot-based channel sensing. In some examples, the slot-dependent channel sensing process may be indicated using one or more parameters sent from higher layers at the UE 215-a (e.g., associated with the sidelink message 225). For example, higher layers at the UE 215-a use one or more parameters to indicate whether to perform the channel sensing process 205 to determine resources for sidelink transmissions (e.g., transmissions of the sidelink message 225) using slots or mini-slots.

[0064] UE 215-a may perform a slot-dependent channel sensing process (e.g., channel sensing process 205) in a sidelink resource pool at time interval increments to identify a first time-frequency resource of the sidelink resource pool that may be used for transmission of a sidelink message 225. UE 215 may transmit sidelink message 225 via the first time-frequency resource. In some examples, use of channel sensing process 205 (e.g., slot-dependent channel sensing process) may enable improved resource utilization within wireless communication system 200, as well as other possible benefits.

[0065] Figure 3 An example of a timing diagram 300 supporting techniques for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure is illustrated. In some examples, the timing diagram 300 may implement or be implemented by one or more aspects of the wireless communication system 100 and the wireless communication system 200. For example, the timing diagram 300 may illustrate operations performed at one or more UEs, which may be reference UEs. Figure 1 and Figure 2 An example of a UE is described.

[0066] In some examples, one or more UEs may support a channel sensing process for a resource pool that can be used for time slots and mini-time slots. For example, a first UE may determine to use one or more resources that may occur after time slot (n) to send a sidelink message, during which the first UE may initiate a resource selection trigger. For example, the first UE may determine to use one or more resources included in a resource selection window 310 to send a sidelink message, which may occur after a time instance 325 during which the first UE may initiate a resource selection trigger. In some examples, the first UE may initiate a resource selection trigger (e.g., at time instance 325) based on one or more indications from a higher layer at the first UE. For example, a higher layer at the first UE may request the first UE to determine (e.g., and report to the higher layer) a set of resources that can be used for sidelink transmission using time slot 320. Additionally or alternatively, the higher layer may indicate one or more parameters associated with the sidelink transmission. In some examples, the first UE may initiate a selection trigger (e.g., at time instance 325) in response to receiving an indication of the one or more parameters. That is, in response to receiving one or more parameters associated with sidelink transmissions using time slots, the first UE may determine to perform time slot-based channel sensing (eg, for full time slot transmissions).

[0067] In some examples, in response to initiating a resource selection trigger, the first UE may attempt to decode control information (e.g., SCI) received at the first UE before initiating the resource selection trigger. That is, the UE may identify (e.g., search for) resources for sending side link messages using full time slots. For example, the first UE may monitor resources included in the sensing window 305. In this example, the first UE may receive SCI from the second UE using resource 330-a, which may include (e.g., spanning in the time domain) mini-time slot 315. In some examples, the first UE may receive SCI (e.g., using resource 330-a) at a receive power that may satisfy a threshold. That is, the first UE may receive SCI (e.g., using resource 330-a) using mini-time slots, and the SCI (or corresponding PSSCH) may be received at the first UE with a receive power (e.g., RSRP) that satisfies a threshold (e.g., RSRP ≥ TH(p i ,P j )). In some examples, the first UE may determine whether to use PSCCH or PSSCH (e.g., PSCCH symbol or PSSCH symbol) to measure RSRP based on a parameter (e.g., sl-RS-ForSensing IE). The SCI may indicate that resources 330-b and resources 330-c are reserved at the second UE for sidelink transmission. For example, the SCI received in a mini-slot of a time slot (e.g., time slot m) (e.g., using resource 330-a) may include an RRI i and priority (p_i). In this example (e.g., for RRI i ≠0), the RRI may indicate a periodic time-frequency resource (eg, resource 330-c) reserved at the second UE.

[0068] Additionally or alternatively, the SCI received in a mini-slot (e.g., resource 330-a) may include a TRA that may indicate another time-frequency resource (e.g., resource 330-b) reserved at the second UE. In this example, the first UE may determine that the resources reserved using the SCI (e.g., resource 330-b and resource 330-c) are unavailable for sidelink transmissions at the first UE. Additionally or alternatively, the first UE may determine that the reserved resources (e.g., resource 330-b and resource 330-c) are mini-slots (e.g., including mini-slots, spanning mini-slots in the time domain). For example, the first UE may exclude full slots (e.g., any full slots) and continuous subchannel resources that may overlap with the resources reserved by the received SCI. That is, the first UE may exclude full slots and a certain number of continuous subchannels that may overlap with the time-frequency resources indicated using the received SCI. As Figure 3As illustrated in the example of , the first UE may exclude time-frequency resources overlapping with resource window 335 (e.g., may refrain from attempting to reserve these time-frequency resources for sidelink transmission), which resource window may span time slot 320 in the time domain and subchannel 340 in the frequency domain (e.g., a set of consecutive subchannels, which may be represented using parameter L subCH denoted by ). Subchannel 340 may correspond to the number of subchannels that the first UE may use to send the sidelink message. For example, the first UE may use resources 331 that do not overlap with a time slot (e.g., in the time domain) having a set of continuous frequency resources (e.g., subchannel 340) including resource 330-b or resource 330-c reserved by the SCI to send the sidelink message.

[0069] In some examples, the first UE may use resource 331 to send a sidelink message based on the fact that resource 331 does not overlap with resource window 335. For example, the first UE may identify the number of resources within resource selection window 310 that are not available for the transmission of sidelink messages. In some examples, the identified number of resources may include resources reserved at other UEs (e.g., resources 330-b and resources 330-c) and resources adjacent to the reserved resources (e.g., resources included in resource window 335). In such examples, the first UE may refrain from attempting to reserve the identified number of resources. For example, the first UE may attempt to reserve one of the other resources, such as a full-slot resource (e.g., resource 331) that does not overlap with resource 330-b or resource 330-c. For example, the first UE may send an SCI message to reserve resource 331 before resource selection window 310. Additionally or alternatively, the first UE may use resource 331 to send a sidelink message. In some examples, using resource 331 to send a sidelink message may improve the reliability of communication at the first UE, as well as other possible benefits.

[0070] Figure 4 An example of a timing diagram 400 supporting techniques for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure is illustrated. In some examples, the timing diagram 400 may implement or be implemented by one or more aspects of the wireless communication system 100, the wireless communication system 200, and the timing diagram 300. For example, the timing diagram 400 may illustrate operations performed at one or more UEs, which may be reference UEs. Figures 1 to 3 An example of a UE is described.

[0071] In some examples, one or more UEs may support a channel sensing process for a resource pool that can be used for time slots and mini-slots. For example, the first UE may determine to use one or more resources included in the resource selection window 410 to send a sidelink message. The resource selection window 410 may occur after the time instance 425, during which the first UE may initiate a resource selection trigger. In some examples, the first UE may initiate a resource selection trigger based on one or more indications from a higher layer at the first UE. For example, the higher layer at the first UE may request the lower layer at the first UE to determine (e.g., and report to the higher layer) a set of resources that can be used for sidelink transmission using mini-slots 415. Additionally or alternatively, the higher layer may indicate one or more parameters associated with the sidelink transmission. In some examples, the first UE may initiate a selection trigger (e.g., at time instance 425) in response to receiving an indication of the one or more parameters. That is, in response to receiving an indication of one or more parameters associated with sidelink transmission using mini-slots, the first UE may determine to perform channel sensing based on mini-slots (e.g., channel sensing for mini-slot transmission).

[0072] In some examples, in order to identify resources for sending sidelink messages using mini-slots (e.g., looking for resources for sending mini-slots), the first UE may monitor the SCI during the sensing window 405. In such examples, the first UE may receive the SCI from the second UE using resource 430-a, which may span time slot 420 in the time domain. The SCI may indicate that resource 430-b and resource 430-c are reserved for sidelink transmission at the second UE. In some examples, the first UE may receive the SCI (e.g., using resource 430-a) at a receive power that can meet a threshold. In such an example, the first UE may determine that the resources reserved using the SCI (e.g., resource 430-b and resource 430-c) may not be available for sidelink transmission at the first UE. For example, the first UE may exclude resources that may overlap with resources reserved by the received SCI (e.g., any continuous subchannel mini-slot resources). That is, the first UE may exclude mini-slots and a certain number of continuous subchannels that may overlap with the time-frequency resources indicated by the received SCI. like Figure 4 As illustrated in the example of , the first UE may exclude time-frequency resources that overlap with resource windows 435-a and resource windows 435-b (e.g., suppress attempts to reserve these time-frequency resources for sidelink transmissions), which resource windows may span mini-slots 415 in the time domain and subchannels 440 in the frequency domain (e.g., a set of consecutive subchannels, which may be specified using parameter L subCH440 may correspond to the number of subchannels that the first UE may use to send a sidelink message. For example, the first UE may use resources 431 that do not overlap with a mini-slot (e.g., in the time domain) having a continuous frequency resource set (e.g., subchannel 440) including resources 430-b or resources 430-c reserved by the SCI to send a sidelink message. In some examples, the first UE may use resources 431 to send a sidelink message based on the fact that resources 431 do not overlap with resources 430-c and resources 430-b.

[0073] In some examples, the first UE may use resource 431 to send a sidelink message based on the fact that resource 431 does not overlap with resource 430-c and resource 430-b. For example, the first UE may identify the number of resources within the resource selection window 410 that are not available for the transmission of the sidelink message. In some examples, the identified number of resources may include resources reserved at other UEs (e.g., resource 430-b and resource 430-c) and resources adjacent to the reserved resources (e.g., resources included in resource window 435). In such examples, the first UE may refrain from attempting to reserve the identified number of resources. For example, the first UE may attempt to reserve one of the other resources, such as a mini-slot resource (e.g., resource 431) that does not overlap with resource 430-b or resource 430-c. For example, the first UE may send an SCI message to reserve resource 431 before the resource selection window 410. Additionally or alternatively, the first UE may use resource 431 to send a sidelink message. In some examples, using resource 431 to send sidelink messages may improve reliability of communications at the UE, among other possible benefits.

[0074] Figure 5 An example of a timing diagram 500 that supports techniques for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure is illustrated. In some examples, timing diagram 500 may implement or be implemented by one or more aspects of wireless communication system 100, wireless communication system 200, timing diagram 300, and timing diagram 400. For example, timing diagram 500 may illustrate operations performed at one or more UEs, which may be reference UEs. Figures 1 to 4 An example of a UE is described.

[0075] In some examples, one or more UEs may support a channel sensing process for a resource pool that can be used for time slots and mini-time slots. For example, the first UE may determine to use one or more resources included in the resource selection window 510 to send a sidelink message. The resource selection window 510 may occur after the time instance 525, during which the first UE may initiate a resource selection trigger. In some examples, the first UE may initiate a resource selection trigger based on one or more indications from a higher layer at the first UE. For example, the higher layer at the first UE may request the lower layer at the first UE to determine (e.g., and report to the higher layer) a set of resources that can be used for sidelink transmission of a mini-time slot 515 (e.g., included in the time slot 520). Additionally or alternatively, the higher layer may indicate one or more parameters associated with the sidelink transmission. In some examples, the first UE may initiate a selection trigger (e.g., at the time instance 525) in response to receiving an indication of the one or more parameters. That is, in response to receiving an indication of one or more parameters associated with sidelink transmission using mini-slots, the first UE may determine to perform mini-slot-based channel sensing (e.g., channel sensing for mini-slot transmissions).

[0076] In some examples, in order to identify resources for sending sidelink messages using mini-slots (e.g., looking for resources for sending mini-slots), the first UE may monitor the SCI during the sensing window 505. In such examples, the first UE may receive the SCI from the second UE using resource 530-a, which may span the mini-slot 515 in the time domain. The SCI may indicate that resources 530-b and resources 530-c are reserved for sidelink transmission at the second UE. In some examples, the first UE may receive the SCI (e.g., using resource 530-a) at a receive power that can meet a threshold. In such an example, the first UE may determine that the resources reserved using the SCI (e.g., resources 530-b and resources 530-c) may not be available for sidelink transmission at the first UE. For example, the first UE may exclude resources that may overlap with the resources reserved by the received SCI (e.g., any continuous sub-channel mini-slot resources). That is, the first UE may exclude mini-slots and a certain number of consecutive sub-channels that may overlap with the time-frequency resources indicated by the received SCI. Figure 5 As illustrated in the example of , the first UE may exclude time-frequency resources overlapping with resource window 535 (e.g., refrain from attempting to reserve these time-frequency resources for sidelink transmission), which resource window may span time slot 515 in the time domain and span subchannel 540 in the frequency domain (e.g., a set of consecutive subchannels, which may be specified using parameter L subCH540 may correspond to the number of subchannels that the first UE may use to send the sidelink message. For example, the first UE may use resources 531 that do not overlap with a mini-slot (e.g., in the time domain) having a set of continuous frequency resources (e.g., subchannel 540) including resources 530-b or resources 530-c reserved by the SCI to send the sidelink message.

[0077] In some examples, the first UE may use resource 531 to send a sidelink message based on the fact that resource 531 does not overlap with resource window 535. For example, the first UE may identify the number of resources within resource selection window 510 that are not available for the transmission of sidelink messages. In some examples, the identified number of resources may include resources reserved at other UEs (e.g., resources 530-b and resources 530-c) and resources adjacent to the reserved resources (e.g., resources included in resource window 535). In such examples, the first UE may refrain from attempting to reserve the identified number of resources. For example, the first UE may attempt to reserve one of the other resources, such as a mini-slot resource (e.g., resource 531) that does not overlap with resource 530-b or resource 530-c. For example, the first UE may send an SCI message before resource selection window 510 to reserve resource 531. Additionally or alternatively, the first UE may use resource 531 to send a sidelink message. In some examples, using resource 531 to send a sidelink message may improve the reliability of communication at the UE, as well as other possible benefits.

[0078] Figure 6 An example of a process flow 600 supporting techniques for sidelink channel sensing utilizing mini-slots in accordance with one or more aspects of the present disclosure is illustrated. In some examples, the process flow 600 may implement one or more aspects of the wireless communication system 100, the wireless communication system 200, the timing diagram 300, the timing diagram 400, and the timing diagram 500. For example, the process flow 600 may include example operations associated with UE 615-a, UE 615-b, and UE 615-c, which may be as described in reference Figures 1 to 5 The examples of UEs described herein. Operations performed at UE 615 may support improvements to communications between UE 615, among other benefits. In the following description of process flow 600, operations between UE 615 may be performed in an order different from the example shown. Additionally or alternatively, operations performed at UE 615 may be performed in a different order or at a different time. Some operations may also be omitted. In some examples, UE 615 may support a framework for a channel sensing process that accommodates slot-based and mini-slot-based channel sensing.

[0079] At 620, the UE 215-a may perform channel sensing. For example, at 621, a lower layer 614 (e.g., of a protocol stack associated with the UE 615-a) may receive from a higher layer 613 of the protocol stack an indication of a first time slot-related channel sensing process to be performed during the channel sensing (e.g., at 620). The first time slot-related channel sensing process may be one of a plurality of available time slot-related channel sensing processes. In some examples, the first time slot-related channel sensing process may indicate a time interval increment according to which channel sensing is to be performed. At 622, the lower layer 614 of the protocol stack associated with the UE 615-a may perform the first time slot-related channel sensing process based on the indication. The first time slot-related channel sensing process may be as described throughout this disclosure (including references Figure 2 ) is an example of a time slot-based or sub-slot-based channel sensing process described in the foregoing. For example, the first time slot-related channel sensing process may indicate to the UE 615-a to perform one of the time slot-based channel sensing or the sub-slot-based channel sensing. The UE 615-a may perform the first time slot-related channel sensing process (e.g., at 622) in the side link resource pool at a time interval increment (e.g., a time slot length or a sub-slot length) to identify a first time-frequency resource of the side link resource pool that can be used for transmission of a side link message.

[0080] In some examples, at 625, UE 615-a may receive SCI from UE 615-c during a sensing window monitored by a first time slot related channel sensing process. The SCI may be a signal transmitted throughout this disclosure (including references to Figure 2 ) An example of an SCI described in the foregoing. For example, the SCI may reserve a sub-time slot (or time slot) of a side link resource pool.

[0081] At 630, UE 615-a may send a sidelink message to UE 615-b using a first time-frequency resource that does not overlap with a sub-slot (or time slot) reserved by the SCI sent at 625 based on the received power of the SCI satisfying a threshold. In some examples, identifying the first time-frequency resource using a first time-slot-related channel sensing process may facilitate improved resource utilization of a shared radio frequency spectrum band, among other possible benefits.

[0082] Figure 7 A block diagram 700 of a device 705 supporting techniques for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure is illustrated. The device 705 may be an example of aspects of a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0083] The receiver 710 may provide components for receiving information associated with various information channels (e.g., control channels, data channels, information channels related to techniques for sidelink channel sensing using micro-slots) such as packets, user data, control information, or any combination thereof. The information may be passed to other components of the device 705. The receiver 710 may utilize a single antenna or a collection of multiple antennas.

[0084] The transmitter 715 may provide components for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to techniques for sidelink channel sensing using micro-slots) such as packets, user data, control information, or any combination thereof. In some examples, the transmitter 715 may be co-located with the receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0085] The communication manager 720, the receiver 710, the transmitter 715, or various combinations thereof or their various components may be examples of components for performing aspects of the techniques for sidelink channel sensing using micro-slots as described herein. For example, the communication manager 720, the receiver 710, the transmitter 715, or various combinations thereof or components may support methods for performing one or more of the functions described herein.

[0086] In some examples, the communication manager 720, the receiver 710, the transmitter 715, or various combinations thereof or components may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured to or otherwise supporting components for performing the functions described in this disclosure. In some examples, a processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by the processor executing instructions stored in the memory).

[0087] Additionally or alternatively, in some examples, the communication manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functions described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0088] In some examples, the communication manager 720 can be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise cooperating with the receiver 710, the transmitter 715, or both. For example, the communication manager 720 can receive information from the receiver 710, transmit information to the transmitter 715, or integrate with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.

[0089] The communication manager 720 may support wireless communication at a UE (e.g., device 705) according to examples as disclosed herein. For example, the communication manager 720 may be configured to or otherwise support a component for receiving an indication of a first time slot-related channel sensing process in a set of multiple available time slot-related channel sensing processes to be performed during channel sensing, the first time slot-related channel sensing process indicating a time interval increment according to which channel sensing is to be performed. The communication manager 720 may be configured to or otherwise support a component for performing a first time slot-related channel sensing process in a side link resource pool in a time interval increment based on the indication to identify a first time-frequency resource of the side link resource pool that can be used for transmission of a side link message. The communication manager 720 may be configured to or otherwise support a component for sending a side link message via the first time-frequency resource.

[0090] By including or configuring a communication manager 720 according to examples as described herein, a device 705 (e.g., a processor controlling or otherwise coupled to a receiver 710, a transmitter 715, a communication manager 720, or a combination thereof) may support techniques for more efficiently utilizing communication resources.

[0091] Figure 8A block diagram 800 of a device 805 supporting techniques for sidelink channel sensing utilizing mini-slots according to one or more aspects of the present disclosure is illustrated. The device 805 may be an example of aspects of the device 705 or UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communication manager 820. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0092] The receiver 810 may provide means for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for sidelink channel sensing utilizing mini-slots). The information may be communicated to other components of the device 805. The receiver 810 may utilize a single antenna or a collection of multiple antennas.

[0093] The transmitter 815 may provide means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for sidelink channel sensing utilizing mini-slots). In some examples, the transmitter 815 may be co-located with the receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a collection of multiple antennas.

[0094] Device 805 or its various components may be examples of components for performing various aspects of the technology for side link channel sensing using mini-time slots as described herein. For example, communication manager 820 may include sensing process indication component 825, channel sensing component 830, side link message component 835, or any combination thereof. Communication manager 820 may be an example of various aspects of communication manager 720 as described herein. In some examples, communication manager 820 or its various components may be configured to use or otherwise cooperate with receiver 810, transmitter 815, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, communication manager 820 may receive information from receiver 810, transmit information to transmitter 815, or integrate with receiver 810, transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.

[0095] The communication manager 820 may support wireless communication at a UE (e.g., device 805) according to examples disclosed herein. The sensing process indication component 825 may be configured to or otherwise support a component for receiving an indication of a first slot-related channel sensing process in a set of multiple available slot-related channel sensing processes to be performed during channel sensing, the first slot-related channel sensing process indicating a time interval increment according to which to perform channel sensing. The channel sensing component 830 may be configured to or otherwise support a component for performing the first slot-related channel sensing process in a sidelink resource pool in time interval increments based on the indication to identify a first time-frequency resource of the sidelink resource pool available for transmission of a sidelink message. The sidelink message component 835 may be configured to or otherwise support a component for transmitting a sidelink message via the first time-frequency resource.

[0096] Fig. 9 Block diagram 900 illustrates a communication manager 920 supporting techniques for sidelink channel sensing utilizing micro-slots in accordance with one or more aspects of the present disclosure. The communication manager 920 may be an example of aspects of the communication manager 720, the communication manager 820, or both as described herein. The communication manager 920 or its various components may be examples of components for performing various aspects of the techniques for sidelink channel sensing utilizing micro-slots as described herein. For example, the communication manager 920 may include a sensing process indication component 925, a channel sensing component 930, a sidelink message component 935, an SCI component 940, a priority component 945, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0097] According to examples disclosed herein, the communication manager 920 may support wireless communication at a UE. The sensing process indication component 925 may be configured to or otherwise support a component for receiving an indication of a first slot-related channel sensing process in a set of multiple available slot-related channel sensing processes to be performed during channel sensing, the first slot-related channel sensing process indicating a time interval increment according to which to perform channel sensing. The channel sensing component 930 may be configured to or otherwise support a component for performing the first slot-related channel sensing process in a sidelink resource pool in time interval increments based on the indication to identify a first time-frequency resource of the sidelink resource pool available for transmission of a sidelink message. The sidelink message component 935 may be configured to or otherwise support a component for transmitting a sidelink message via the first time-frequency resource.

[0098] In some examples, to support performing a first time slot-related channel sensing process, the SCI component 940 may be configured to or otherwise support a component for receiving an SCI of a sub-time slot of a reserved side link resource pool from a second UE during a sensing window monitored by the first time slot-related channel sensing process, wherein based on a received power of the SCI satisfying a threshold, a side link message is sent using a first time-frequency resource that does not overlap with the sub-time slot reserved by the SCI. In some examples, the priority component 945 may be configured to or otherwise support a component for receiving an indication of a first priority associated with a side link message, wherein the threshold is based on a first priority associated with the side link message and a second priority associated with the sub-time slot reserved by the SCI.

[0099] In some examples, to support performance of a first time slot-related channel sensing process, the SCI component 940 may be configured as or otherwise support components for receiving an SCI of a sub-slot of a reserved side link resource pool from a second UE during a sensing window monitored by the first time slot-related channel sensing process, wherein the side link message is sent via a first time-frequency resource that does not overlap with a time slot having a set of continuous frequency resources including the sub-slot reserved by the SCI.

[0100] In some examples, to support performance of a first time slot-related channel sensing process, the SCI component 940 may be configured as or otherwise support components for receiving an SCI for a time slot of a reserved side link resource pool from a second UE during a sensing window monitored by the first time slot-related channel sensing process, wherein the side link message is sent via a first time-frequency resource that does not overlap with a sub-time slot of a set of continuous frequency resources including the time slot reserved by the SCI.

[0101] In some examples, to support performance of a first time slot-related channel sensing process, the SCI component 940 may be configured as or otherwise support components for receiving an SCI for a first sub-slot of a reserved side link resource pool from a second UE during a sensing window monitored by the first time slot-related channel sensing process, wherein the side link message is sent via a first time-frequency resource that does not overlap with a second sub-slot having a set of continuous frequency resources including the first sub-slot reserved by the SCI.

[0102] In some examples, the sensing process indication component 925 may be configured to or otherwise support a component for receiving an indication of one or more parameters associated with a first time slot-related channel sensing process, wherein the first time slot-related channel sensing process is performed in response to receiving an indication of the one or more parameters. In some examples, the one or more parameters include a side link resource pool available for transmission of a side link message, a priority associated with the side link message, a packet delay budget associated with the side link message, or one or more of a certain amount of continuous frequency resources to be used for transmission of the side link message. In some examples, the first time slot-related channel sensing process indicates to the UE to perform one of time slot-based channel sensing or sub-time slot-based channel sensing.

[0103] Fig.10 A diagram of a system 1000 including a device 1005 supporting techniques for sidelink channel sensing utilizing mini-time slots according to one or more aspects of the present disclosure is illustrated. The device 1005 may be an example of a device 705, a device 805, or a UE 115 as described herein, or include components thereof. The device 1005 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 1005 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 1020, an input / output (I / O) controller 1010, a transceiver 1015, an antenna 1025, a memory 1030, a code 1035, and a processor 1040. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1045).

[0104] I / O controller 1010 can manage input signals and output signals of device 1005. I / O controller 1010 can also manage peripheral devices that are not integrated into device 1005. In some cases, I / O controller 1010 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1010 can utilize an operating system, such as or another known operating system. Additionally or alternatively, I / O controller 1010 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1010 may be implemented as part of a processor (such as processor 1040). In some cases, a user may interact with device 1005 via I / O controller 1010 or via hardware components controlled by I / O controller 1010.

[0105] In some cases, the device 1005 may include a single antenna 1025. However, in some other cases, the device 1005 may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1015 may communicate bidirectionally via one or more antennas 1025, a wired or wireless link, as described herein. For example, the transceiver 1015 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1015 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 1025 for transmission; and demodulating packets received from one or more antennas 1025. The transceiver 1015 or the transceiver 1015 and one or more antennas 1025 may be examples of transmitters 715, transmitters 815, receivers 710, receivers 810, or any combination thereof or components thereof as described herein.

[0106] The memory 1030 may include random access memory (RAM) and read-only memory (ROM). The memory 1030 may store computer-readable, computer-executable code 1035 including instructions that, when executed by the processor 1040, cause the device 1005 to perform various functions described herein. The code 1035 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 1035 may not be directly executable by the processor 1040, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 1030 may also contain, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0107] Processor 1040 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1040 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to enable device 1005 to perform various functions (e.g., various functions or tasks supporting techniques for side link channel sensing using micro-time slots). For example, device 1005 or a component of device 1005 may include processor 1040 and memory 1030 coupled to or coupled to processor 1040, and processor 1040 and memory 1030 are configured to perform various functions described herein.

[0108] The communication manager 1020 may support wireless communication at a UE (e.g., device 1005) according to examples as disclosed herein. For example, the communication manager 1020 may be configured to or otherwise support a component for receiving an indication of a first time slot-related channel sensing process in a set of multiple available time slot-related channel sensing processes to be performed during channel sensing, the first time slot-related channel sensing process indicating a time interval increment according to which channel sensing is to be performed. The communication manager 1020 may be configured to or otherwise support a component for performing a first time slot-related channel sensing process in a side link resource pool in a time interval increment based on the indication to identify a first time-frequency resource of the side link resource pool that can be used for transmission of a side link message. The communication manager 1020 may be configured to or otherwise support a component for sending a side link message via the first time-frequency resource.

[0109] By including or configuring a communications manager 1020 according to examples as described herein, the device 1005 can support techniques for improving communications reliability, reducing latency, and more efficiently utilizing communications resources.

[0110] In some examples, the communication manager 1020 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 1015, one or more antennas 1025, or any combination thereof. Although the communication manager 1020 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1020 may be supported or performed by the processor 1040, the memory 1030, the code 1035, or any combination thereof. For example, the code 1035 may include instructions that are executable by the processor 1040 to cause the device 1005 to perform various aspects of the techniques for sidelink channel sensing with mini-slots as described herein, or the processor 1040 and the memory 1030 may be otherwise configured to perform or support such operations.

[0111] Fig.11 A flow chart illustrating a method 1100 for supporting techniques for sidelink channel sensing utilizing mini-time slots according to one or more aspects of the present disclosure is illustrated. The operations of the method 1100 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1100 may be implemented by a UE or components thereof as described herein. Figures 1 to 10 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0112] At 1105, the method may include receiving an indication of a first time slot-related channel sensing process from a set of a plurality of available time slot-related channel sensing processes to be performed during channel sensing, the first time slot-related channel sensing process indicating a time interval increment at which channel sensing is to be performed. The operations of 1105 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed as described in reference to Fig. 9 The sensing process described is directed to component 925 for execution.

[0113] At 1110, the method may include performing a first time slot-related channel sensing process in the side link resource pool at time interval increments based on the indication to identify a first time-frequency resource of the side link resource pool that can be used for transmission of the side link message. The operations of 1110 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1110 may be performed as described in reference to Fig. 9 The channel sensing component 930 described above is performed.

[0114] At 1115, the method may include sending a side link message via the first time-frequency resource. The operations of 1115 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed as described in reference to Fig. 9 The side link message component 935 is used to execute.

[0115] Fig.12 A flow chart illustrating a method 1200 for supporting techniques for sidelink channel sensing utilizing mini-time slots according to one or more aspects of the present disclosure is illustrated. The operations of the method 1200 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1200 may be implemented by a UE or components thereof as described herein. Figures 1 to 10 The described UE 115 may be performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0116] At 1205, the method may include receiving an indication of a first time slot-related channel sensing process in a set of a plurality of available time slot-related channel sensing processes to be performed during channel sensing, the first time slot-related channel sensing process indicating a time interval increment at which channel sensing is to be performed. The operations of 1205 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed as described in reference to Fig. 9 The sensing process described is directed to component 925 for execution.

[0117] At 1210, the method may include performing a first time slot-related channel sensing process in the side link resource pool at time interval increments based on the indication to identify a first time-frequency resource of the side link resource pool that can be used for transmission of the side link message. The operations of 1210 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed as described in reference to Fig. 9 The channel sensing component 930 described above is performed.

[0118] At 1215, the method may include receiving an SCI for a sub-slot of a reserved side link resource pool from a second UE during a sensing window monitored by a first time slot related channel sensing process. The operations of 1215 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed as described in reference to Fig. 9 The SCI component 940 executes.

[0119] At 1220, the method may include sending a sidelink message via the first time-frequency resource, wherein based on the received power of the SCI satisfying a threshold, the sidelink message is sent using the first time-frequency resource that does not overlap with a sub-slot reserved by the SCI. The operations of 1220 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1220 may be performed as described in reference to Fig. 9 The side link message component 935 is used to execute.

[0120] The following aspects are given by way of illustration.Examples of the following aspects may be combined with the examples or embodiments shown or discussed with respect to the figures or elsewhere in this document.

[0121] Aspect 1: A method for performing wireless communications at a UE, comprising: receiving an indication of a first time slot-related channel sensing process among multiple available time slot-related channel sensing processes to be performed during channel sensing, the first time slot-related channel sensing process indicating a time interval increment according to which the channel sensing is to be performed; performing the first time slot-related channel sensing process in a side link resource pool at the time interval increment based at least in part on the indication to identify a first time-frequency resource of the side link resource pool that can be used for sending a side link message; and sending the side link message via the first time-frequency resource.

[0122] Aspect 2: A method according to Aspect 1, wherein performing the first time slot related channel sensing process includes: during a sensing window monitored by the first time slot related channel sensing process, receiving side link control information of a sub-time slot reserved for the side link resource pool from a second UE, wherein based at least in part on the received power of the side link control information satisfying a threshold, using the first time frequency resource that does not overlap with the sub-time slot reserved by the side link control information to send the side link message.

[0123] Aspect 3: The method according to Aspect 2 also includes: receiving an indication of a first priority associated with the side link message, wherein the threshold is at least partially based on the first priority associated with the side link message and a second priority associated with the sub-time slot reserved by the side link control information.

[0124] Aspect 4: A method according to any one of Aspects 1 to 3, wherein performing the first time slot related channel sensing process includes: receiving side link control information of a sub-time slot reserved for the side link resource pool from a second UE during a sensing window monitored by the first time slot related channel sensing process, wherein the side link message is sent via the first time frequency resource that does not overlap with a time slot of a set of continuous frequency resources including the sub-time slot reserved by the side link control information.

[0125] Aspect 5: A method according to any one of Aspects 1 to 3, wherein performing the first time slot-related channel sensing process includes: receiving side link control information of a time slot reserved for the side link resource pool from a second UE during a sensing window monitored by the first time slot-related channel sensing process, wherein the side link message is sent via the first time-frequency resource that does not overlap with a sub-time slot of a set of continuous frequency resources including the time slot reserved by the side link control information.

[0126] Aspect 6: A method according to any one of Aspects 1 to 3, wherein performing the first time slot related channel sensing process includes: receiving side link control information of the first sub-time slot reserved for the side link resource pool from a second UE during a sensing window monitored by the first time slot related channel sensing process, wherein the side link message is sent via the first time frequency resource that does not overlap with a second sub-time slot having a set of continuous frequency resources including the first sub-time slot reserved by the side link control information.

[0127] Aspect 7: The method according to any one of Aspects 1 to 6 further includes: receiving an indication of one or more parameters associated with the first time slot-related channel sensing process, wherein the first time slot-related channel sensing process is performed in response to receiving the indication of the one or more parameters.

[0128] Aspect 8: A method according to Aspect 7, wherein the one or more parameters include one or more of the side link resource pool capable of being used for sending the side link message, the priority associated with the side link message, the packet delay budget associated with the side link message, or the number of contiguous frequency resources to be used for sending the side link message.

[0129] Aspect 9: The method according to any one of aspects 1 to 8, wherein the first time slot related channel sensing process indicates to the UE to perform one of time slot based channel sensing or sub-time slot based channel sensing.

[0130] Aspect 10: An apparatus for performing wireless communication at a UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of Aspects 1 to 9.

[0131] Aspect 11: An apparatus for performing wireless communication at a UE, the apparatus comprising: at least one component for performing the method according to any one of aspects 1 to 9.

[0132] Aspect 12: A non-transitory computer-readable medium storing a code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 9.

[0133] Examples of these aspects may be combined with aspects or embodiments disclosed in other specific implementations. It should be noted that the methods described herein describe possible specific implementations, and each operation and step may be rearranged or otherwise modified and other specific implementations are also possible. In addition, various aspects from two or more methods may be combined.

[0134] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0135] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0136] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed using a general purpose processor, DSP, ASIC, CPU, 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 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0137] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium, or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. 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.

[0138] Computer-readable medium includes both non-transient computer storage medium and communication medium, and the communication medium includes any medium that promotes the transfer of computer programs from one location to another location.Non-transient storage medium can be any available medium that can be accessed by a general or special computer.By way of example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage device, disk storage device or other magnetic storage device, or can be used for carrying or storing desired program code components and any other non-transient medium that can be accessed by a general or special computer or a general or special processor in the form of an instruction or data structure.Moreover, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from a website, a server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of computer-readable medium. As used herein, disks and optical disks include CDs, laser disks, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks. Disks can reproduce data magnetically, and optical disks can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0139] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0140] The term "determining" encompasses a variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, and the like. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Additionally, "determining" may include parsing, obtaining, selecting, choosing, establishing, and other such similar actions.

[0141] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between the similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0142] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." The specific implementation includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0143] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), include: receiving an indication of a first time slot associated channel sensing procedure among a plurality of available time slot associated channel sensing procedures to be performed during a channel sensing period, the first time slot associated channel sensing procedure indicating a time interval increment at which the channel sensing is to be performed; Based at least in part on the indication, performing the first time slot-related channel sensing process in the sidelink resource pool at the time interval increment to identify a first time-frequency resource of the sidelink resource pool that can be used for transmission of a sidelink message; as well as The sidelink message is sent via the first time-frequency resource.

2. The method according to claim 1, wherein the first time slot related channel sensing process is performed include: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a sub-time slot reserved for the side link resource pool is received from a second UE, wherein the side link message is sent using the first time-frequency resource that does not overlap with the sub-time slot reserved by the side link control information based at least in part on a received power of the side link control information satisfying a threshold.

3. The method according to claim 2, further comprising: include: An indication of a first priority associated with the sidelink message is received, wherein the threshold is based at least in part on the first priority associated with the sidelink message and a second priority associated with the subslot reserved by the sidelink control information.

4. The method according to claim 1, wherein the first time slot related channel sensing process is performed include: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a sub-time slot reserved for the side link resource pool is received from a second UE, wherein the side link message is sent via the first time-frequency resource that does not overlap with a time slot having a set of continuous frequency resources including the sub-time slot reserved by the side link control information.

5. The method according to claim 1, wherein the first time slot related channel sensing process is performed include: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a time slot reserved in the side link resource pool is received from a second UE, wherein the side link message is sent via the first time-frequency resource that does not overlap with a sub-time slot of a set of continuous frequency resources including the time slot reserved by the side link control information.

6. The method according to claim 1, wherein the first time slot related channel sensing process is performed include: During a sensing window monitored by the first time slot associated channel sensing process, sidelink control information of a first sub-time slot reserved for the sidelink resource pool is received from a second UE, wherein the sidelink message is sent via the first time-frequency resource that does not overlap with a second sub-time slot of a set of continuous frequency resources including the first sub-time slot reserved by the sidelink control information.

7. The method according to claim 1, further comprising: include: An indication of one or more parameters associated with the first time slot-related channel sensing procedure is received, wherein the first time slot-related channel sensing procedure is performed in response to receiving the indication of the one or more parameters.

8. The method of claim 7, wherein the one or more parameters include one or more of a pool of side link resources that can be used for sending the side link message, a priority associated with the side link message, a packet delay budget associated with the side link message, or a number of contiguous frequency resources to be used for sending the side link message.

9. The method of claim 1, wherein the first time slot related channel sensing process indicates to the UE to perform one of time slot based channel sensing or sub-time slot based channel sensing.

10. An apparatus for wireless communication at a user equipment (UE), the apparatus include: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receiving an indication of a first time slot associated channel sensing procedure among a plurality of available time slot associated channel sensing procedures to be performed during a channel sensing period, the first time slot associated channel sensing procedure indicating a time interval increment at which the channel sensing is to be performed; Based at least in part on the indication, performing the first time slot-related channel sensing process in the sidelink resource pool at the time interval increment to identify a first time-frequency resource of the sidelink resource pool that can be used for transmission of a sidelink message; as well as The sidelink message is sent via the first time-frequency resource.

11. The apparatus of claim 10, wherein the instructions for performing the first time slot related channel sensing process are executable by the processor to cause the apparatus to: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a sub-time slot reserved for the side link resource pool is received from a second UE, wherein the side link message is sent using the first time-frequency resource that does not overlap with the sub-time slot reserved by the side link control information based at least in part on a received power of the side link control information satisfying a threshold.

12. The apparatus of claim 11, wherein the instructions are further executable by the processor to cause the apparatus to: An indication of a first priority associated with the sidelink message is received, wherein the threshold is based at least in part on the first priority associated with the sidelink message and a second priority associated with the subslot reserved by the sidelink control information.

13. The apparatus of claim 10, wherein the instructions for performing the first time slot associated channel sensing process are executable by the processor to cause the apparatus to: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a sub-time slot reserved for the side link resource pool is received from a second UE, wherein the side link message is sent via the first time-frequency resource that does not overlap with a time slot having a set of continuous frequency resources including the sub-time slot reserved by the side link control information.

14. The apparatus of claim 10, wherein the instructions for performing the first time slot associated channel sensing process are executable by the processor to cause the apparatus to: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a time slot reserved in the side link resource pool is received from a second UE, wherein the side link message is sent via the first time-frequency resource that does not overlap with a sub-time slot of a set of continuous frequency resources including the time slot reserved by the side link control information.

15. The apparatus of claim 10, wherein the instructions for performing the first time slot associated channel sensing process are executable by the processor to cause the apparatus to: During a sensing window monitored by the first time slot associated channel sensing process, sidelink control information of a first sub-time slot reserved for the sidelink resource pool is received from a second UE, wherein the sidelink message is sent via the first time-frequency resource that does not overlap with a second sub-time slot of a set of continuous frequency resources including the first sub-time slot reserved by the sidelink control information.

16. The apparatus of claim 10, wherein the instructions are further executable by the processor to cause the apparatus to: An indication of one or more parameters associated with the first time slot-related channel sensing procedure is received, wherein the first time slot-related channel sensing procedure is performed in response to receiving the indication of the one or more parameters.

17. An apparatus according to claim 16, wherein the one or more parameters include one or more of the side link resource pool that can be used for sending the side link message, the priority associated with the side link message, the packet delay budget associated with the side link message, or the number of contiguous frequency resources to be used for sending the side link message.

18. The apparatus of claim 10, wherein the first slot-related channel sensing process indicates to the UE to perform one of slot-based channel sensing or sub-slot-based channel sensing.

19. An apparatus for wireless communication at a user equipment (UE), the apparatus include: means for receiving an indication of a first time slot associated channel sensing procedure of a plurality of available time slot associated channel sensing procedures to be performed during channel sensing, the first time slot associated channel sensing procedure indicating a time interval increment at which the channel sensing is to be performed; means for performing, based at least in part on the indication, in a sidelink resource pool at the time interval increments, the first time slot-related channel sensing process to identify a first time-frequency resource of the sidelink resource pool that can be used for transmission of a sidelink message; and Means for sending the sidelink message via the first time-frequency resources.

20. The apparatus of claim 19, wherein the means for performing the first time slot associated channel sensing process include: A component for receiving side link control information of a sub-time slot reserved in the side link resource pool from a second UE during a sensing window monitored by the first time slot related channel sensing process, wherein the side link message is sent using the first time-frequency resource that does not overlap with the sub-time slot reserved by the side link control information based at least in part on a received power of the side link control information satisfying a threshold.

21. The device according to claim 20, further comprising: include: means for receiving an indication of a first priority associated with the sidelink message, wherein the threshold is based at least in part on the first priority associated with the sidelink message and a second priority associated with the subslot reserved by the sidelink control information.

22. The apparatus of claim 19, wherein the means for performing the first time slot associated channel sensing process include: Means for receiving, from a second UE, sidelink control information for a sub-time slot reserved for the sidelink resource pool during a sensing window monitored by the first time slot associated channel sensing process, wherein the sidelink message is sent via the first time-frequency resource that does not overlap with a time slot having a set of continuous frequency resources including the sub-time slot reserved by the sidelink control information.

23. The apparatus of claim 19, wherein the means for performing the first time slot associated channel sensing process include: Means for receiving sidelink control information of a time slot reserved in the sidelink resource pool from a second UE during a sensing window monitored by the first time slot related channel sensing process, wherein the sidelink message is sent via the first time-frequency resource that does not overlap with a sub-slot of a set of continuous frequency resources including the time slot reserved by the sidelink control information.

24. The apparatus of claim 19, wherein the means for performing the first time slot associated channel sensing process include: Means for receiving, from a second UE during a sensing window monitored by a first time slot associated channel sensing process, sidelink control information for a first sub-time slot reserved for the sidelink resource pool, wherein the sidelink message is sent via the first time-frequency resource that does not overlap with a second sub-time slot of a set of continuous frequency resources including the first sub-time slot reserved by the sidelink control information.

25. The device according to claim 19, further comprising: include: Means for receiving an indication of one or more parameters associated with the first time slot-related channel sensing procedure, wherein the first time slot-related channel sensing procedure is performed in response to receiving the indication of the one or more parameters.

26. An apparatus according to claim 25, wherein the one or more parameters include one or more of the side link resource pool that can be used for sending the side link message, the priority associated with the side link message, the packet delay budget associated with the side link message, or the number of contiguous frequency resources to be used for sending the side link message.

27. The apparatus of claim 19, wherein the first slot-related channel sensing process indicates to the UE to perform one of slot-based channel sensing or sub-slot-based channel sensing.

28. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: receiving an indication of a first time slot associated channel sensing procedure among a plurality of available time slot associated channel sensing procedures to be performed during a channel sensing period, the first time slot associated channel sensing procedure indicating a time interval increment at which the channel sensing is to be performed; Based at least in part on the indication, performing the first time slot-related channel sensing process in the sidelink resource pool at the time interval increment to identify a first time-frequency resource of the sidelink resource pool that can be used for transmission of a sidelink message; as well as The sidelink message is sent via the first time-frequency resource.

29. The non-transitory computer readable medium of claim 28, wherein the instructions for performing the first time slot related channel sensing process are executable by the processor to: During a sensing window monitored by the first time slot associated channel sensing process, side link control information of a sub-time slot reserved for the side link resource pool is received from a second UE, wherein the side link message is sent using the first time-frequency resource that does not overlap with the sub-time slot reserved by the side link control information based at least in part on a received power of the side link control information satisfying a threshold.

30. The non-transitory computer readable medium of claim 29, wherein the instructions are further executable by the processor to: An indication of a first priority associated with the sidelink message is received, wherein the threshold is based at least in part on the first priority associated with the sidelink message and a second priority associated with the subslot reserved by the sidelink control information.

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