Sidelink resource selection for multiple-consecutive-slot transmission
The method for sidelink resource selection in MCSTs addresses the challenges of dynamic resource management in wireless communication systems by dynamically adjusting resource inclusion or exclusion based on LBT operations and RSRP thresholds, enhancing the reliability and integrity of MCSTs.
Patent Information
- Application Number
- PCT/CN2023/112537
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-11
- Publication Date
- 2025-02-20
AI Technical Summary
Existing wireless communication systems face challenges in efficiently selecting sidelink resources for multiple-consecutive-slot transmissions (MCSTs), particularly in dynamic environments where signal attenuation and interference are prevalent.
A method for sidelink resource selection in MCSTs, where a user equipment (UE) selects a set of sidelink resources, receives reservations indicating available resources, and transmits the MCST by including or excluding reserved resources based on listen-before-talk (LBT) operations, RSRP thresholds, and priority settings.
This approach enhances the reliability and integrity of MCSTs by dynamically adjusting resource inclusion or exclusion, reducing interference, and maintaining channel access longer than traditional single-slot transmissions.
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Figure CN2023112537_20022025_PF_FP_ABST
Abstract
Description
SIDELINK RESOURCE SELECTION FOR MULTIPLE-CONSECUTIVE-SLOT TRANSMISSION
[0001] FIELD OF THE DISCLOSURE
[0002] Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for sidelink resource selection for multiple-consecutive-slot transmission (MCST) .BACKGROUND
[0003] Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communications system resources with those users.
[0004] Although wireless communications systems have made great technological advancements over many years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continuous desire to improve the technical performance of wireless communications systems, including, for example: improving speed and data carrying capacity of communications, improving efficiency of the use of shared communications mediums, reducing power used by transmitters and receivers while performing communications, improving reliability of wireless communications, avoiding redundant transmissions and / or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access wireless communications systems, increasing the ability for different types of devices to intercommunicate, increasing the number and types of wireless communications mediums available for use, and the like. Consequently, there exists a need for further improvements in wireless communications systems to overcome the aforementioned technical challenges and others.SUMMARY
[0005] In some aspects, a method of wireless communication performed by a UE includes selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises an MCST; receiving a reservation indicating one or more sidelink resources of the set of sidelink resources; and transmitting the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST.
[0006] Other aspects provide: an apparatus operable, configured, or otherwise adapted to perform any one or more of the aforementioned methods and / or those described herein with reference to and as illustrated by the drawings; a non-transitory, computer-readable medium comprising computer-executable instructions that, when executed by a processor of an apparatus, cause the apparatus to perform the aforementioned methods and / or those described herein with reference to and as illustrated by the drawings; a computer program product embodied on a computer-readable storage medium comprising code for performing the aforementioned methods and / or those described herein with reference to and as illustrated by the drawings; an apparatus configured for wireless communication, comprising one or more memories comprising processor-executable instructions and one or more processors configured to execute the processor-executable instructions and cause the apparatus to perform the aforementioned methods and / or those described herein with reference to and as illustrated by the drawings; and / or an apparatus comprising means for performing the aforementioned methods and / or those described herein with reference to and as illustrated by the drawings. by way of example, an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks.
[0007] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.
[0008] While aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios. Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and / or packaging arrangements. For example, some aspects may be implemented via integrated chip embodiments or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, and / or artificial intelligence devices) . Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices incorporating described aspects and features may include additional components and features for implementation and practice of claimed and described aspects. For example, transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and / or summers) . It is intended that aspects described herein may be practiced in a wide variety of devices, components, systems, distributed arrangements, and / or end-user devices of varying size, shape, and constitution.BRIEF DESCRIPTION OF THE DRAWINGS
[0009] So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.
[0010] Fig. 1 depicts an example of a wireless communications network, in accordance with the present disclosure.
[0011] Fig. 2 depicts aspects of an example BS and UE, in accordance with the present disclosure.
[0012] Fig. 3 depicts an example disaggregated base station architecture, in accordance with the present disclosure.
[0013] Figs. 4A, 4B, 4C, and 4D depict aspects of data structures for a wireless communications network, in accordance with the present disclosure.
[0014] Fig. 5 is a diagram illustrating an example of sidelink communications, in accordance with the present disclosure.
[0015] Fig. 6 is a diagram illustrating an example of sidelink communications and access link communications, in accordance with the present disclosure.
[0016] Fig. 7 is a diagram illustrating an example of resource allocation for sidelink communications, in accordance with the present disclosure.
[0017] Fig. 8 is a diagram illustrating an example of resource selection for sidelink communications, in accordance with the present disclosure.
[0018] Fig. 9 is a diagram illustrating an example of signaling for resource re-evaluation for multiple-consecutive-slot transmission (MCST) , in accordance with the present disclosure.
[0019] Fig. 10 is a diagram illustrating an example of including or omitting sidelink resources based at least in part on an outcome of a listen-before-talk (LBT) operation, in accordance with the present disclosure.
[0020] Fig. 11 is a diagram illustrating an example of omitting or including sidelink resources based at least in part on a resource exclusion threshold and an offset associated with the MCST.
[0021] Fig. 12 is a diagram illustrating an example of omitting or including sidelink resources according to a first priority associated with the sidelink transmission, a second priority associated with the reservation, and whether an initial resource of the reservation occurs before an initial resource of the sidelink transmission, in accordance with the present disclosure.
[0022] Fig. 13 is a diagram illustrating an example of omitting or including sidelink resources according to respective priorities of slots of an MCST, in accordance with the present disclosure.
[0023] Fig. 14 is a diagram illustrating an example of omitting or including sidelink resources according to an LBT type of a reserved resource, in accordance with the present disclosure.
[0024] Fig. 15 is a flowchart of an example method of wireless communication.
[0025] Fig. 16 is a diagram illustrating an example of an implementation of code and circuitry for a communications device, in accordance with the present disclosure.DETAILED DESCRIPTION
[0026] Aspects of the present disclosure provide apparatuses, methods, processing systems, and computer-readable mediums for sidelink resource selection for multiple-consecutive-slot transmission (MCST) .
[0027] User equipments (UEs) can communicate with one another directly (e.g., as compared to communicating via a network entity such as a base station) . This may be referred to as sidelink communication. Sidelink communications occur on sidelink resources, which may include time resources, frequency resources, and / or spatial resources. In some deployments, sidelink communications are centrally scheduled, such as by a gNB or a controlling UE. In some other deployments, UEs autonomously select sidelink resources (referred to as “resource selection” ) , as described elsewhere herein. Resource selection may include identification of candidate resources by sensing and exclusion, and candidate resource selection from the identified resources. Some sidelink communications may occur in a band that requires a channel access mechanism such as a listen-before-talk (LBT) operation. For example, some sidelink communications may occur in an unlicensed band.
[0028] After selecting a sidelink resource for a communication, a UE may transmit a reservation that reserves the sidelink resource. There may be a time gap between selecting the sidelink resource and reserving the sidelink resource, which may lead to the sidelink resource being reserved by another UE before the UE can transmit the reservation. Therefore, resource selection may support a re-evaluation of the identification of candidate resources, and of the candidate resource selection. If a selected, but not yet reserved, sidelink resource is reserved by another UE, resource re-evaluation may be triggered. If a subset of selected but not yet reserved resources (e.g., M resources) are indicated for re-evaluation by a physical layer of the UE, then a medium access control (MAC) layer of the UE may remove the M resources from a set of N candidate resources and may randomly select M new candidate resources from the available candidate resources within a new selection window.
[0029] A UE may support multiple-consecutive-slot transmission (MCST) . MCST differs from traditional transmission in that a sidelink communication can be transmitted over multiple slots (such as in multiple transport blocks, each mapped to one slot) . In traditional sidelink transmission, a communication typically occupies one slot. MCST provides consecutive transmission for multiple transport blocks. MCST may be beneficial for unlicensed spectrum, in which UEs may have to perform a channel access operation (e.g., an LBT operation) to access the channel, since the MCST may maintain the channel access longer than a single-slot transmission.
[0030] In some sidelink deployments (such as in a licensed band not utilizing decentralized channel access) , a selected, but not yet reserved, resource could be reserved by another UE. A MAC layer of the UE receiving the reservation may remove the reserved resources from the selected resources and may randomly select new candidate resources from the available candidate resources within the new selection window. In unlicensed sidelink, MCST is supported to achieve a consecutive transmission for multiple transport blocks. If the above procedure is directly used in unlicensed sidelink, removing a resource may interrupt a bundle of resources for the MCST (e.g., consecutive slots) and prevent reaping the benefits of bundled resource selection. Furthermore, a reserved resource may be outside of a channel occupancy time (COT) of the reserving UE. In this case, even if the reserved resource is removed, the reserving UE may not be able to use this reserved resource due to LBT failure, meaning that the resource cannot be used by the reserving UE or the UE receiving the reservation.
[0031] Aspects of the present disclosure relate generally to resource selection for MCST. Some aspects more specifically relate to re-evaluating selected resources after a reservation for the selected resources is received. In some aspects, the UE may omit reserved resources from candidate resources for a re-evaluation associated with an MCST if an LBT operation of a resource immediately preceding the reserved resources fails. In some aspects, the UE may include the reserved resources as candidate resources if the LBT operation of the resource immediately preceding the reserved resources succeeds. In some aspects, the UE may include or omit the reserved resources based on an RSRP threshold for resource exclusion, where the RSRP threshold is modified based on an offset. In some aspects, the UE may include or omit the resources based on priorities of the reserved resource and the selected resource.
[0032] Aspects of the present disclosure can be used to realize one or more of the following potential advantages. In some aspects, by omitting reserved resources from an MCST if an LBT operation of a resource immediately preceding the reserved resources fails (e.g., if the UE fails to obtain channel access for the portion of the MCST impacted by the reserved resource) , the UE reduces interference with the reserving UE’s transmission at a time when the UE failed to obtain channel access. by including the reserved resources if the LBT operation of the resource immediately preceding the reserved resources succeeds, the UE maintains the integrity of the MCST without interruption. by including or omitting the reserved resources based on an RSRP threshold for resource exclusion, where the RSRP threshold is modified based on an offset, the UE can bias resource exclusion such that the reservation is less likely to be taken into account, thereby reducing interruption of the MCST. by including or omitting the resources based on priorities of the reserved resource and the selected resource, the UE can reduce interruption of the MCST when the reserved resource is lower priority, and can honor the reservation for the reserved resource when the reserved resource is higher priority.
[0033] Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
[0034] Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, or the like (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0035] While aspects may be described herein using terminology commonly associated with a 5G or New Radio (NR) radio access technology (RAT) , aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and / or a RAT subsequent to 5G (e.g., 6G) .
[0036] Fig. 1 depicts an example of a wireless communications network 100, in accordance with the present disclosure.
[0037] Generally, wireless communications network 100 includes various network entities (alternatively, network elements or network nodes) . A network entity is generally a communications device and / or a communications function performed by a communications device (e.g., a UE, a base station (BS) , a component of a BS, a server, etc. ) . For example, various functions of a network as well as various devices associated with and interacting with a network may be considered network entities. Further, wireless communications network 100 includes terrestrial aspects, such as ground-based network entities (e.g., BSs 110) , and non-terrestrial aspects, such as satellite 140 and aircraft 145, which may include network entities on-board (e.g., one or more BSs) capable of communicating with other network elements (e.g., terrestrial BSs) and UEs.
[0038] In the depicted example, wireless communications network 100 includes BSs 110, UEs 120, and one or more core networks, such as an Evolved Packet Core (EPC) 160 and 5G Core (5GC) 190, which interoperate to provide communications services over various communications links, including wired and wireless links.
[0039] Fig. 1 depicts various example UEs 120, which may include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system (GPS) , a multimedia device, a video device, a digital audio player, a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, an internet of things (IoT) device, an always on (AON) device, an edge processing device, or another similar device. A UE 120 may also be referred to as a mobile device, a wireless device, a wireless communication device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, or a handset, among other examples.
[0040] BSs 110 may wirelessly communicate with (e.g., transmit signals to or receive signals from) UEs 120 via communications links 170. The communications links 170 between BSs 110 and UEs 120 may carry uplink (UL) (also referred to as reverse link) transmissions from a UE 120 to a BS 110 and / or downlink (DL) (also referred to as forward link) transmissions from a BS 110 to a UE 120. The communications links 170 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity in various aspects.
[0041] A BS 110 may include, for example, a NodeB, an enhanced NodeB (eNB) , a next generation enhanced NodeB (ng-eNB) , a next generation NodeB (gNB or gNodeB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a transmission reception point, and / or others. A BS 110 may provide communications coverage for a respective geographic coverage area 112, which may sometimes be referred to as a cell, and which may overlap in some cases (e.g., a small cell provided by a BS 110a may have a coverage area 112′that overlaps the coverage area 112 of a macro cell) . A BS 110 may, for example, provide communications coverage for a macro cell (covering a relatively large geographic area) , a pico cell (covering a relatively smaller geographic area, such as a sports stadium) , a femto cell (covering a relatively smaller geographic area (e.g., a home) ) , and / or other types of cells.
[0042] While BSs 110 are depicted in various aspects as unitary communications devices, BSs 110 may be implemented in various configurations. For example, one or more components of a base station may be disaggregated, including a central unit (CU) , one or more distributed units (DUs) , one or more radio units (RUs) , a Near-Real Time (Near-RT) radio access network (RAN) Intelligent Controller (RIC) , or a Non-Real Time (Non-RT) RIC, to name a few examples. In another example, various aspects of a base station may be virtualized. More generally, a BS (e.g., BS 110) may include components that are located at a single physical location or components located at various physical locations. In examples in which a BS includes components that are located at various physical locations, the various components may each perform functions such that, collectively, the various components achieve functionality that is similar to a BS that is located at a single physical location. In some aspects, a BS including components that are located at various physical locations may be referred to as having a disaggregated RAN architecture, such as an Open RAN (O-RAN) architecture or a Virtualized RAN (vRAN) architecture. Fig. 3 depicts and describes an example disaggregated BS architecture.
[0043] Different BSs 110 within wireless communications network 100 may also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G, among other examples. For example, BSs 110 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) ) may interface with the EPC 160 through first backhaul links 132 (e.g., an S1 interface) . bSs 110 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN) ) may interface with 5GC 190 through second backhaul links 184. bSs 110 may communicate directly or indirectly (e.g., through the EPC 160 or 5GC 190) with each other over third backhaul links 134 (e.g., X2 interfaces) , which may be wired or wireless.
[0044] Wireless communications network 100 may subdivide the electromagnetic spectrum into various classes, bands, channels, or other features. In some aspects, the subdivision is based on wavelength and frequency, where frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, or a subband. For example, 3GPP currently defines Frequency Range 1 (FR1) as including 410 MHz –7125 MHz, which is often referred to (interchangeably) as “Sub-6 GHz” . Similarly, the 3rd Generation Partnership Project (3GPP) currently defines Frequency Range 2 (FR2) as including 24, 250 MHz –52, 600 MHz, which is sometimes referred to (interchangeably) as a “millimeter wave” ( “mmW” or “mmWave” ) . A base station configured to communicate using mmWave or near mmWave radio frequency bands (e.g., a mmWave base station such as BS 110b) may utilize beamforming (e.g., as shown by 182) with a UE (e.g., 120) to improve path loss and range.
[0045] The communications links 170 between BSs 110 and, for example, UEs 120, may be through one or more carriers, which may have different bandwidths (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, and / or other bandwidths) , and which may be aggregated in various aspects. Carriers may or may not be adjacent to each other. In some examples, allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) .
[0046] Communications using higher frequency bands may have higher path loss and a shorter range compared to lower frequency communications. Accordingly, certain base stations (e.g., base station 110b in Fig. 1) may utilize beamforming with a UE 120 to improve path loss and range, as shown at 182. For example, BS 110b and the UE 120 may each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate the beamforming. In some cases, BS 110b may transmit a beamformed signal to UE 120 in one or more transmit directions 182′. UE 120 may receive the beamformed signal from the BS 110b in one or more receive directions 182″. UE 120 may also transmit a beamformed signal to the BS 110b in one or more transmit directions 182″. bS 110b may also receive the beamformed signal from UE 120 in one or more receive directions 182′. bS 110b and UE 120 may then perform beam training to determine the best receive and transmit directions for each of BS 110b and UE 120. Notably, the transmit and receive directions for BS 110b may or may not be the same. Similarly, the transmit and receive directions for UE 120 may or may not be the same.
[0047] Wireless communications network 100 further includes a Wi-Fi access point 150 in communication with Wi-Fi stations (STAs) 152 via communications links 154 in, for example, a 2.4 GHz and / or 5 GHz unlicensed frequency spectrum.
[0048] Certain UEs 120 may communicate with each other using device-to-device (D2D) communications link 158. D2D communications link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink control channel (PSCCH) , and / or a physical sidelink feedback channel (PSFCH) .
[0049] EPC 160 may include various functional components, including: a Mobility Management Entity (MME) 161, other MMEs 162, a Serving Gateway 163, a Multimedia Broadcast Multicast Service (MBMS) Gateway 164, a Broadcast Multicast Service Center (BM-SC) 165, and / or a Packet Data Network (PDN) Gateway 166, such as in the depicted example. MME 161 may be in communication with a Home Subscriber Server (HSS) 167. MME 161 is a control node that processes the signaling between the UEs 120 and the EPC 160. Generally, MME 161 provides bearer and connection management.
[0050] Generally, user Internet protocol (IP) packets are transferred through Serving Gateway 163, which is connected to PDN Gateway 166. PDN Gateway 166 provides UE IP address allocation as well as other functions. PDN Gateway 166 and the BM-SC 165 are connected to IP Services 168, which may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a Packet Switched (PS) streaming service, and / or other IP services.
[0051] BM-SC 165 may provide functions for MBMS user service provisioning and delivery. bM-SC 165 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and / or may be used to schedule MBMS transmissions. MBMS Gateway 164 may distribute MBMS traffic to the BSs 110 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.
[0052] 5GC 190 may include various functional components, including: an Access and Mobility Management Function (AMF) 191, other AMFs 192, a Session Management Function (SMF) 193, and a User Plane Function (UPF) 194. AMF 191 may be in communication with Unified Data Management (UDM) 195.
[0053] AMF 191 is a control node that processes signaling between UEs 120 and 5GC 190. AMF 191 provides, for example, quality of service (QoS) flow and session management.
[0054] IP packets are transferred through UPF 194, which is connected to the IP Services 196, and which provides UE IP address allocation as well as other functions for 5GC 190. IP Services 196 may include, for example, the Internet, an intranet, an IMS, a PS streaming service, and / or other IP services.
[0055] In various aspects, a network entity or network node can be implemented as an aggregated base station, a disaggregated base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, a transmission reception point (TRP) , or a combination thereof, to name a few examples.
[0056] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
[0057] Fig. 2 depicts aspects of an example BS 110 and UE 120, in accordance with the present disclosure.
[0058] Generally, BS 110 includes various processors (e.g., 220, 230, 238, and 240) , antennas 234a-t (collectively 234) , transceivers 232a-t (collectively 232) , which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., data source 212) and wireless reception of data (e.g., data sink 239) . For example, BS 110 may send and receive data between BS 110 and UE 120. bS 110 includes controller / processor 240, which may be configured to implement various functions described herein related to wireless communications.
[0059] Generally, UE 120 includes various processors (e.g., 258, 264, 266, and 280) , antennas 252a-r (collectively 252) , transceivers 254a-r (collectively 254) , which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., retrieved from data source 262) and wireless reception of data (e.g., provided to data sink 260) . UE 120 includes controller / processor 280, which may be configured to implement various functions described herein related to wireless communications.
[0060] For an example downlink transmission, BS 110 includes a transmit processor 220 that may receive data from a data source 212 and control information from a controller / processor 240. The control information may be for the physical broadcast channel (PBCH) , the physical control format indicator channel (PCFICH) , the physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) , the physical downlink control channel (PDCCH) , the group common PDCCH (GC PDCCH) , and / or other channels. The data may be for the physical downlink shared channel (PDSCH) , in some examples.
[0061] Transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , the secondary synchronization signal (SSS) , the PBCH demodulation reference signal (DMRS) , or the channel state information reference signal (CSI-RS) .
[0062] Transmit (TX) MIMO processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 232a-232t. Each modulator in transceivers 232a-232t may process a respective output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from the modulators in transceivers 232a-232t may be transmitted via the antennas 234a-234t, respectively.
[0063] UE 120 includes antennas 252a-252r that may receive the downlink signals from the BS 110 and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator in transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples to obtain received symbols.
[0064] Receive (RX) MIMO detector 256 may obtain received symbols from all the demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information to a controller / processor 280.
[0065] For an example uplink transmission, UE 120 further includes a transmit processor 264 that may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) ) from the controller / processor 280. Transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) . The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM) , and transmitted to BS 110.
[0066] At BS 110, the uplink signals from UE 120 may be received by antennas 234a-234t, processed by the demodulators in transceivers 232a-232t, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240. Memories 242 and 282 may store data and program codes (e.g., processor-executable instructions, computer-executable instructions) for BS 110 and UE 120, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.
[0067] In various aspects, BS 110 may be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 212, scheduler 244, memory 242, transmit processor 220, controller / processor 240, TX MIMO processor 230, transceivers 232a-t, antenna 234a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 234a-t, transceivers 232a-t, RX MIMO detector 236, controller / processor 240, receive processor 238, scheduler 244, memory 242, a network interface, and / or other aspects described herein.
[0068] In various aspects, UE 120 may likewise be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 262, memory 282, transmit processor 264, controller / processor 280, TX MIMO processor 266, transceivers 254a-t, antenna 252a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 252a-t, transceivers 254a-t, RX MIMO detector 256, controller / processor 280, receive processor 258, memory 282, and / or other aspects described herein.
[0069] In some aspects, a processor may be configured to perform various operations, such as those associated with the methods described herein, and transmit (output) data to or receive (obtain) data from another interface that is configured to transmit or receive, respectively, the data. In some aspects, an individual processor may perform all of the functions described as being performed by the one or more processors. In some aspects, one or more processors may collectively perform a set of functions. For example, a first set of (one or more) processors of the one or more processors may perform a first function described as being performed by the one or more processors, and a second set of (one or more) processors of the one or more processors may perform a second function described as being performed by the one or more processors. The first set of processors and the second set of processors may be the same set of processors or may be different sets of processors. Reference to “one or more processors” should be understood to refer to any one or more of the processors described in connection with Fig. 2. Reference to “one or more memories” should be understood to refer to any one or more memories of a corresponding device, such as the memory described in connection with Fig. 2. For example, functions described as being performed by one or more memories can be performed by the same subset of the one or more memories or different subsets of the one or more memories.
[0070] While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.
[0071] As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
[0072] Deployment of communication systems, such as 5G NR systems, may be arranged in multiple manners with various components or constituent parts. In a 5G NR system, or network, a network node, a network entity, a mobility element of a network, a RAN node, a core network node, a network element, a base station, or a network equipment may be implemented in an aggregated or disaggregated architecture. For example, a base station (such as a Node B (NB) , an evolved NB (eNB) , an NR BS, a 5G NB, an access point (AP) , a TRP, or a cell, among other examples) , or one or more units (or one or more components) performing base station functionality, may be implemented as an aggregated base station (also known as a standalone base station or a monolithic base station) or a disaggregated base station. “Network entity” or “network node” may refer to a disaggregated base station, or to one or more units of a disaggregated base station (such as one or more CUs, one or more DUs, one or more RUs, or a combination thereof) .
[0073] An aggregated base station (e.g., an aggregated network node) may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit) . A disaggregated base station (e.g., a disaggregated network node) may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more CUs, one or more DUs, or one or more RUs) . In some examples, a CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other network nodes. The DUs may be implemented to communicate with one or more RUs. Each of the CU, DU and RU also can be implemented as virtual units, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples.
[0074] Base station-type operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in an IAB network, an O-RAN (such as the network configuration sponsored by the O-RAN Alliance) , or a vRAN (also known as a cloud RAN (C-RAN) ) to facilitate scaling of communication systems by separating base station functionality into one or more units that can be individually deployed. A disaggregated base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented for at least one unit virtually, which can enable flexibility in network design. The various units of the disaggregated base station can be configured for wired or wireless communication with at least one other unit of the disaggregated base station.
[0075] Fig. 3 depicts an example disaggregated base station 300 architecture, in accordance with the present disclosure. The disaggregated base station 300 architecture may include one or more CUs 310 that can communicate directly with a core network 320 via a backhaul link, or indirectly with the core network 320 through one or more disaggregated base station units (such as a Near-RT RIC 325 via an E2 link, or a Non-RT RIC 315 associated with a Service Management and Orchestration (SMO) Framework 305, or both) . A CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as an F1 interface. The DUs 330 may communicate with one or more RUs 340 via respective fronthaul links. The RUs 340 may communicate with respective UEs 120 via one or more radio frequency (RF) access links. In some implementations, the UE 120 may be simultaneously served by multiple RUs 340.
[0076] Each of the units (e.g., the CUs 310, the DUs 330, the RUs 340, as well as the Near-RT RICs 325, the Non-RT RICs 315 and the SMO Framework 305) may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communications interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally or alternatively, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as an RF transceiver) , configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
[0077] In some aspects, the CU 310 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC) , packet data convergence protocol (PDCP) , service data adaptation protocol (SDAP) , or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 310. The CU 310 may be configured to handle user plane functionality (e.g., Central Unit –User Plane (CU-UP) ) , control plane functionality (e.g., Central Unit –Control Plane (CU-CP) ) , or a combination thereof. In some implementations, the CU 310 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 310 can be implemented to communicate with the DU 330, as necessary, for network control and signaling.
[0078] The DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340. In some aspects, the DU 330 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by 3GPP. In some aspects, the DU 330 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 330, or with the control functions hosted by the CU 310.
[0079] Lower-layer functionality can be implemented by one or more RUs 340. In some deployments, an RU 340, controlled by a DU 330, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like) , or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU (s) 340 can be implemented to handle over-the-air (OTA) communications with one or more UEs 120. In some implementations, real-time and non-real-time aspects of control and user plane communications with the RU (s) 340 can be controlled by the corresponding DU 330. In some scenarios, this configuration can enable the DU (s) 330 and the CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0080] The SMO Framework 305 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 305 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an O1 interface) . For virtualized network elements, the SMO Framework 305 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface) . Such virtualized network elements can include, but are not limited to, CUs 310, DUs 330, RUs 340, and Near-RT RICs 325. In some implementations, the SMO Framework 305 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 311, via an O1 interface. Additionally, in some implementations, the SMO Framework 305 can communicate directly with one or more RUs 340 via an O1 interface. The SMO Framework 305 also may include a Non-RT RIC 315 configured to support functionality of the SMO Framework 305.
[0081] The Non-RT RIC 315 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the Near-RT RIC 325. The Non-RT RIC 315 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 325. The Near-RT RIC 325 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 310, one or more DUs 330, or both, as well as an O-eNB, with the Near-RT RIC 325.
[0082] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 325, the Non-RT RIC 315 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 325 and may be received at the SMO Framework 305 or the Non-RT RIC 315 from non-network data sources or from network functions. In some examples, the Non-RT RIC 315 or the Near-RT RIC 325 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 315 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 305 (such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies) .
[0083] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0084] Figs. 4A, 4B, 4C, and 4D depict aspects of data structures for a wireless communications network, such as wireless communications network 100 of Fig. 1, in accordance with the present disclosure. Fig. 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, Fig. 4B is a diagram 430 illustrating an example of DL channels within a 5G subframe, Fig. 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and Fig. 4D is a diagram 480 illustrating an example of UL channels within a 5G subframe.
[0085] Wireless communications systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. Such systems may also support half-duplex operation using time division duplexing. OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth (e.g., as depicted in Figs. 4B and 4D) into multiple orthogonal subcarriers. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and / or in the time domain with SC-FDM.
[0086] A wireless communications frame structure may be frequency division duplex (FDD) , in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for either DL or UL. Wireless communications frame structures may also be time division duplex (TDD) , in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for both DL and UL.
[0087] In Figs. 4A and 4C, the wireless communications frame structure is TDD where D is DL, U is UL, and F is flexible for use between DL / UL. UEs may be configured with a slot format through a received slot format indicator (SFI) (dynamically through DL control information (DCI) , or semi-statically / statically through RRC signaling) . In the depicted examples, a 10 ms frame is divided into 10 equally sized 1 ms subframes. Each subframe may include one or more time slots. In some examples, each slot may include 7 or 14 symbols, depending on the slot format. Subframes may also include mini-slots, which generally have fewer symbols than an entire slot. Other wireless communications technologies may have a different frame structure and / or different channels.
[0088] In certain aspects, the number of slots within a subframe is based on a slot configuration and a numerology. For example, for slot configuration 0, different numerologies (μ) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols / slot and 2μ slots / subframe. The subcarrier spacing and symbol length / duration are a function of the numerology. The subcarrier spacing may be equal to 2μ×15 kHz, where μ is the numerology index, which may be selected from values 0 to 5. Accordingly, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=5 has a subcarrier spacing of 480 kHz. Other numerologies and subcarrier spacings may be used. The symbol length / duration is inversely related to the subcarrier spacing. Figs. 4A, 4B, 4C, and 4D provide an example of slot configuration 0 with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.
[0089] As depicted in Figs. 4A, 4B, 4C, and 4D, a resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
[0090] As illustrated in Fig. 4A, some of the REs carry reference (pilot) signals (RSs) for a UE (e.g., UE 120) . The RSs may include DMRSs and / or CSI-RSs for channel estimation at the UE. The RSs may also include beam measurement RSs (BRSs) , beam refinement RSs (BRRSs) , and / or phase tracking RSs (PT-RSs) .
[0091] Fig. 4B illustrates an example of various DL channels within a subframe of a frame. The PDCCH carries DCI within one or more control channel elements (CCEs) , each CCE including, for example, nine RE groups (REGs) , each REG including, for example, four consecutive REs in an OFDM symbol.
[0092] A PSS may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE (e.g., UE 120) to determine subframe / symbol timing and a physical layer identity.
[0093] An SSS may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
[0094] Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI) . based on the PCI, the UE can determine the locations of the aforementioned DMRSs. The PBCH, which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB) ) . The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) . The PDSCH carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and / or paging messages.
[0095] As illustrated in Fig. 4C, some of the REs carry DMRSs (indicated as R for one particular configuration, but other DMRS configurations are possible) for channel estimation at the base station. The UE may transmit DMRSs for the PUCCH and DMRSs for the PUSCH. The PUSCH DMRSs may be transmitted, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRSs may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. UE 120 may transmit SRSs. The SRSs may be transmitted, for example, in the last symbol of a subframe. The SRSs may have a comb structure, and a UE may transmit SRSs on one of the combs. The SRSs may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
[0096] Fig. 4D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK / NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and / or UCI.
[0097] Fig. 5 is a diagram illustrating an example 500 of sidelink communications, in accordance with the present disclosure.
[0098] As shown in Fig. 5, a first UE 505-1 may communicate with a second UE 505-2 (and one or more other UEs 505) via one or more sidelink channels 510. The UEs 505-1 and 505-2 may communicate using the one or more sidelink channels 510 for peer-to-peer communications, device-to-device communications, vehicle-to-anything communications (e.g., which may include vehicle-to-vehicle communications, vehicle-to-infrastructure communications, and / or vehicle-to-pedestrian communications) and / or mesh networking. In some aspects, the UEs 505 (e.g., UE 505-1 and / or UE 505-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, the one or more sidelink channels 510 may use a PC5 interface and / or may operate in a high frequency band (e.g., the 5.9 GHz band) . Additionally, or alternatively, the UEs 505 may synchronize timing of transmission time intervals (TTIs) (e.g., frames, subframes, slots, or symbols) using global navigation satellite system (GNSS) timing.
[0099] As further shown in Fig. 5, the one or more sidelink channels 510 may include a physical sidelink control channel (PSCCH) 515, a physical sidelink shared channel (PSSCH) 520, and / or a physical sidelink feedback channel (PSFCH) 525. The PSCCH 515 may be used to communicate control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communications with a BS 110 via an access link or an access channel. The PSSCH 520 may be used to communicate data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communications with a BS 110 via an access link or an access channel. For example, the PSCCH 515 may carry sidelink control information (SCI) 530, which may indicate various control information used for sidelink communications, such as one or more resources (e.g., time resources, frequency resources, and / or spatial resources) where a transport block (TB) 535 may be carried on the PSSCH 520. The TB 535 may include data. The PSFCH 525 may be used to communicate sidelink feedback 540, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK / NACK) information) , transmit power control (TPC) , and / or a scheduling request (SR) .
[0100] Although shown on the PSCCH 515, in some aspects, the SCI 530 may include multiple communications in different stages, such as a first stage SCI (SCI-1) and a second stage SCI (SCI-2) . The SCI-1 may be transmitted on the PSCCH 515. The SCI-2 may be transmitted on the PSSCH 520. The SCI-1 may include, for example, an indication of one or more resources (e.g., time resources, frequency resources, and / or spatial resources) on the PSSCH 520, information for decoding sidelink communications on the PSSCH, a quality of service (QoS) priority value, a resource reservation period, a PSSCH demodulation reference signal (DMRS) pattern, an SCI format for the SCI-2, a beta offset for the SCI-2, a quantity of PSSCH DMRS ports, and / or a modulation and coding scheme (MCS) . The SCI-2 may include information associated with data transmissions on the PSSCH 520, such as a hybrid automatic repeat request (HARQ) process ID, a new data indicator (NDI) , a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.
[0101] In some aspects, the one or more sidelink channels 510 may use resource pools. For example, a scheduling assignment (e.g., included in SCI 530) may be transmitted in sub-channels using specific resource blocks (RBs) across time. In some aspects, data transmissions (e.g., on the PSSCH 520) associated with a scheduling assignment may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing) . In some aspects, a scheduling assignment and associated data transmissions are not transmitted on adjacent RBs.
[0102] In some aspects, a UE 505 may operate using a sidelink transmission mode (e.g., Mode 1) where resource selection and / or scheduling is performed by a BS 110 (e.g., a base station, a CU, or a DU) . For example, the UE 505 may receive a grant (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as for configured grants) from the BS 110 (e.g., directly or via one or more network nodes) for sidelink channel access and / or scheduling. In some aspects, a UE 505 may operate using a transmission mode (e.g., Mode 2) where resource selection and / or scheduling is performed by the UE 505 (e.g., rather than a BS 110) . In some aspects, the UE 505 may perform resource selection and / or scheduling by sensing channel availability for transmissions. For example, the UE 505 may measure a received signal strength indicator (RSSI) parameter (e.g., a sidelink-RSSI (S-RSSI) parameter) associated with various sidelink channels, may measure a reference signal received power (RSRP) parameter (e.g., a PSSCH-RSRP parameter) associated with various sidelink channels, and / or may measure a reference signal received quality (RSRQ) parameter (e.g., a PSSCH-RSRQ parameter) associated with various sidelink channels, and may select a channel for transmission of a sidelink communication based at least in part on the measurement (s) .
[0103] Additionally, or alternatively, the UE 505 may perform resource selection and / or scheduling using SCI 530 received in the PSCCH 515, which may indicate occupied resources and / or channel parameters. Additionally, or alternatively, the UE 505 may perform resource selection and / or scheduling by determining a channel busy ratio (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 505 can use for a particular set of subframes) .
[0104] In the transmission mode where resource selection and / or scheduling is performed by a UE 505, the UE 505 may generate sidelink grants, and may transmit the grants in SCI 530. A sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks to be used for the upcoming sidelink transmission on the PSSCH 520 (e.g., for TBs 535) , one or more subframes to be used for the upcoming sidelink transmission, and / or a modulation and coding scheme (MCS) to be used for the upcoming sidelink transmission. In some aspects, a UE 505 may generate a sidelink grant that indicates one or more parameters for semi-persistent scheduling (SPS) , such as a periodicity of a sidelink transmission. Additionally, or alternatively, the UE 505 may generate a sidelink grant for event-driven scheduling, such as for an on-demand sidelink message.
[0105] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.
[0106] Fig. 6 is a diagram illustrating an example 600 of sidelink communications and access link communications, in accordance with the present disclosure.
[0107] As shown in Fig. 6, a transmitter (Tx) / receiver (Rx) UE 605 and an Rx / Tx UE 610 may communicate with one another via a sidelink, as described above in connection with Fig. 5. As further shown, in some sidelink modes, a BS 110 may communicate with the Tx / Rx UE 605 (e.g., directly or via one or more network nodes) , such as via a first access link. Additionally, or alternatively, in some sidelink modes, the BS 110 may communicate with the Rx / Tx UE 610 (e.g., directly or via one or more network nodes) , such as via a first access link. The Tx / Rx UE 605 and / or the Rx / Tx UE 610 may correspond to one or more UEs described elsewhere herein, such as the UE 120 of Fig. 1. Thus, a direct link between UEs 120 (e.g., via a PC5 interface) may be referred to as a sidelink, and a direct link between a BS 110 and a UE 120 (e.g., via a Uu interface) may be referred to as an access link. Sidelink communications may be transmitted via the sidelink, and access link communications may be transmitted via the access link. An access link communication may be either a downlink communication (from a BS 110 to a UE 120) or an uplink communication (from a UE 120 to a BS 110) .
[0108] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with respect to Fig. 6.
[0109] Fig. 7 is a diagram illustrating an example 700 of resource allocation for sidelink communications, in accordance with the present disclosure. As shown in Fig. 7, sidelink communications may take place using resource pools. Resource pools may be defined for sidelink transmission and sidelink reception. A resource pool may include one or more sub-channels in the frequency domain and one or more slots in the time domain. For example, the minimum resource allocation in the frequency domain may be a sub-channel, and the minimum resource allocation in the time domain may be a slot. In some aspects, one or more slots of a resource pool may be unavailable for sidelink communications. In some aspects, one or more resource pools may be configured (or pre-configured) for sidelink communications between UEs 120.
[0110] As shown by reference number 710, a first UE 120 may transmit resource reservation information (e.g., a sidelink reservation) in SCI in a first sub-channel and a first slot of the resource pool. The reservation may reserve resources in the first slot and a number (e.g., up to two) of other future slots. For example, as shown in Fig. 7, SCI transmitted in the first slot and the first sub-channel may reserve resources for the first UE 120 in a second sub-channel and a fourth slot and in a third sub-channel and a third slot.
[0111] As shown by reference number 720, a second UE may transmit resource reservation information (e.g., a reservation) in SCI in the first slot that occupies a plurality of sub-channels. The SCI may reserve a plurality of sub-channels for the second UE 120 in a fourth slot of the resource pool and in a seventh slot of the resource pool.
[0112] As indicated above, Fig. 7 is provided as an example. Other examples may differ from what is described with respect to Fig. 7.
[0113] Fig. 8 is a diagram illustrating an example 800 of resource selection for sidelink communications, in accordance with the present disclosure. As shown in Fig. 8, a UE 120 may use a channel sensing procedure to select resources for sidelink communication, such as described above in connection with Fig. 3.
[0114] As shown in Fig. 8, a UE 120 may perform a channel sensing procedure in a sensing window 805. In some cases, the sensing window 805 may be 100 milliseconds (e.g., for aperiodic resource reservation, such as aperiodic reservation in one or more slots of up to 32 logical slots in the future) or 1100 milliseconds (e.g., for periodic resource reservation) . In some cases, a UE 120 configured for communication in an NR network may use a sensing procedure for aperiodic or periodic resource reservation. When the UE 120 is not transmitting, the UE 120 may sense sidelink resources during the sensing window 805. The sensing window 805 may be a time interval defined by a range of slots [n-T0, n-Tproc, 0) , where n is the resource selection or reselection trigger or slot at which new resources must be selected, T0 is (pre-) configured as 100 ms or 1100 ms, and Tproc, 0 is the time to complete the sensing procedure.
[0115] According to the channel sensing procedure, the UE 120 may decode control messages relating to resource reservations of other UEs 120, as well as perform measurements (e.g., RSRP measurements and / or RSSI measurements, among other examples) associated with one or more sidelink channels. For example, the other UEs 120 may transmit reservation information (e.g., in SCI) that indicates a resource reservation for a current slot (e.g., the slot in which the reservation information is transmitted) and for one or more (e.g., up to two) future slots (e.g., as described in connection with Fig. 7) . The UE 120 may monitor for and decode the reservation information during the sensing window 805 to determine a channel availability (e.g., to determine available resources) of the sidelink channel.
[0116] As shown in Fig. 8, the UE 120 may select resources for a sidelink communication based at least in part on a resource selection trigger 810. For example, resource selection may be triggered when the UE 120 has a packet that is to be transmitted or when the UE 120 receives an indication to select (or reselect) resources for a packet that is to be transmitted by the UE 120. Based at least in part on the resource selection trigger 810, the UE 120 may determine one or more resources that are available for selection in a resource selection window 815. That is, the UE 120 may determine the one or more available resources based at least in part on the channel sensing procedure performed by the UE 120. For example, the channel sensing procedure may provide an indication of resources in the resource selection window 815 that are occupied and / or resources in the resource selection window 815 associated with high interference.
[0117] The UE 120 may exclude candidate resources in the resource selection window 815. For example, the resource selection window 815 may include all sidelink resources within a range of slot [n+T1, n+T2] , where T1 is a processing time to identify candidate resources and select new sidelink resources, and T2 is within a range of T2, min ≤ T2 ≤ PDB (packet delay budget) . The UE 120 may exclude resources related to half-duplex operation since the UE 120 cannot sense reservations from other UEs in a slot of the sensing window 805 in which the UE 120 is transmitting. The UE 120 may also exclude the candidate resources based on the reservations received from other UEs in the 1st –stage SCIs detected during the sensing window 805. This operation may be performed in the physical layer of the UE 120, and the physical layer may report available candidate resources (which are the resources of the sensing window 805 that are not excluded 27escryibed above) to a MAC layer of the UE 120.
[0118] The UE 120 may exclude the candidate resources according to an RSRP threshold. A parameter (e.g., sl-Thres-RSRP-List) may provide an RSRP threshold for each combination (pi, pj) , where pi is the value of the priority field in a received SCI format 1-A and pj is the priority of the transmission of the UE 120 selecting resources. For a given invocation of this procedure, pj = prioTX. SL-Thres-RSRP-List may indicate a threshold used for sensing-based UE autonomous resource selection. PrioTX may indicate a priority value of a transport block that the UE 120 plans to transmit. A sidelink resource is excluded if it is indicated or reserved by a decoded SCI and PSSCH / PSCCH RSRP in the associated data resource is above the threshold defined by the information element (IE) SL-Thres-RSRP-List. Value 0 corresponds to minus infinity dBm, value 1 corresponds to -128 dBm, value 2 corresponds to -126 dBm, value n corresponds to (-128 + (n-1) *2) dBm, and so on, where value 66 corresponds to infinity dBm.
[0119] The sensing window 805 may be based at least in part on a timing associated with the resource selection trigger 810. For example, as shown by reference number 820, the sensing window may begin at a time T0 from the resource selection trigger 810. As shown by reference number 825, the sensing window 805 may end at a time Tproc, 0 from the resource selection trigger 810. Tproc, 0 may be based at least in part on a processing time associated with the UE 120. In other words, the UE 120 may continually perform the channel sensing procedure associated with the sidelink channel described above. When the UE 120 is triggered to select resources for a sidelink communication, the UE 120 may consider reservation information and / or measurements associated with the channel sensing procedure that were received and / or performed during the channel sensing window 805.
[0120] As shown by reference numbers 830 and 835, if a resource selection trigger 810 occurs at a time n, the resource selection window 815 may be from n + T1 to n + T2. In some aspects, T1 may be less than a processing time (Tproc, 1) associated with the UE 120. In some aspects, T2 may be greater than or equal to T2, min, which may be a value configured for the UE based at least in part on a priority of the UE 120, and less than or equal to a remaining packet delay budget (PDB) of the packet to be transmitted by the UE 120.
[0121] The UE 120 may select resources of the candidate resources for a communication of the UE 120. For example, a MAC layer of the UE 120 may randomly select the sidelink resources from the available candidate resources reported from the physical layer of the UE 120. To select N candidate resources from the available candidate resources, the UE 120 may first randomly select one of the N candidate resources. For example, the first candidate resource may be selected in slot m1. The UE 120 may then randomly select a second candidate resource, with a restriction that a gap between the second candidate resource and the first selected candidate resource is to be smaller than a window W of 32 slots. This means that the second candidate resources should be located (e.g., in slot m2) within the range of slots [m1-31, m1+31] . If N is larger than 2, the UE 120 may select a third candidate resource with the restriction that it is located (e.g., in slot m3) within the range [m1-31, m1+31] or [m2-31, m2+31] . The above procedure may be repeated until all N candidate resources are selected. The UE 120 may transmit a reservation for the N candidate resources.
[0122] In some aspects, the UE 120 may perform re-evaluation of candidate resource exclusion and / or selection. For example, a selected, but not yet reserved, resource could be reserved by another UE 120. In this case, the resource selection procedure (for re-evaluation) may be triggered. If a subset of selected but not yet reserved resources (e.g., M resources) are indicated for re-evaluation by the UE 120 (e.g., the physical layer) , a MAC layer of the UE 120 may remove the M resources from the N candidate resources (referred to as excluding or omitting the M resources from the candidate resources) , and may randomly select M new candidate resources from the available candidate resources within a new selection window (defined relative to the trigger for re-evaluation) .
[0123] In some aspects, the UE 120 may select sidelink resources for MCST. As noted above, an MCST may include multiple transport blocks (TBs) transmitted on multiple slots (e.g., one slot per TB) . In some aspects, the UE 120 may use a “best effort” approach to select sidelink resources for the MCST. For example, a higher layer of the UE 120 may trigger Layer 1 (L1) (e.g., physical layer) resource selection for one TB with one set of parameters (prioTX, remaining PDB, LsubCH and Prsvp_TX) . L1 of the UE 120 may report a set of candidate single-slot resources (SA) according to the resource selection procedure described above. The higher layer may select a set of resources either randomly or according to a consecutive-slots criterion. The UE 120 may repeat this procedure until each TB of the MCST has a selected sidelink resource.
[0124] In some aspects, the UE 120 may use a “guaranteed MCST for multiple TBs” approach to select sidelink resources for the MCST. For example, a higher layer of the UE 120 may trigger L1 resource (re-) selection once for one or more TBs with one set of parameters (prioTX, remaining PDB, LsubCH and Prsvp_TX) . The L1 resource (re) selection may use a parameter indicating a number of slots for the MCST, which may be derived based on a channel access priority of class (CAPC) of the multiple TBs. L1 of the UE 120 may report a set of candidate multi-slot resources. The higher layer may select a transmission resource for the one or more TBs from the reported set of candidate multi-slot resources.
[0125] Fig. 9 is a diagram illustrating an example 900 of signaling for resource re-evaluation for MCST, in accordance with the present disclosure. Example 900 includes a first UE, shown as UE A (e.g., UE 120, UE 505, UE 605) and a second UE, shown as UE B (e.g., UE 120, UE 505, UE 605) . In example 900, UE A receives a reservation (SCI) and performs resource re-evaluation, and UE B transmits the reservation.
[0126] As shown in Fig. 9, and by reference number 910, UE A may select a set of sidelink resources for a sidelink transmission. The set of sidelink resources may include, for example, two or more slots of a resource pool. In some aspects, the set of sidelink resources may be contiguous. For example, the set of sidelink resources may include a set of slots with no intervening slots (that are not part of the set of sidelink resources) between any two slots of the set of slots. The sidelink transmission may comprise an MCST. For example, the sidelink transmission may comprise a plurality of TBs. UE A may select the set of sidelink resources according to operations described with regard to Fig. 8.
[0127] As shown by reference number 920, UE A may receive, from UE B, a reservation (e.g., SCI, a first part of SCI) indicating a reservation. The reservation may indicate one or more sidelink resources, as described with regard to Fig. 6. The one or more sidelink resources may be included in the set of sidelink resources. Thus, the MCST may be impacted by the one or more sidelink resources.
[0128] As shown by reference number 930, UE A may transmit the sidelink transmission. The sidelink transmission may include, or may omit, the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST. For example, UE A may apply a rule to determine whether the sidelink transmission should include or omit the one or more sidelink resources, and UE A may apply the rule because the sidelink transmission comprises the MCST. Examples of the rule are provided in the description accompanying Fig. 9, and with regard to Figs. 10-13. In some aspects, UE A may include or omit the one or more sidelink resources based at least in part on performing resource re-evaluation regarding the set of sidelink resources. For example, UE A may determine whether the one or more sidelink are included as candidate resources for the resource re-evaluation, or excluded as candidate resources for the resource re-evaluation, according to the techniques described herein. “The sidelink transmission omitting the one or more sidelink resources” may mean that the one or more sidelink resources are excluded as candidate resources. A result of the resource re-evaluation may indicate resources to be used for the sidelink transmission. For example, Figs. 10-14 provide examples of rules that the UE A can use to determine whether a given resource should be included or omitted in the set of sidelink resources, such as whether the given resource should be excluded from the candidate resources for re-selection.
[0129] If the sidelink transmission omits the one or more sidelink resources, UE A may transmit the sidelink transmission (e.g., the MCST) using at least one remaining resource of the set of sidelink resources, other than the one or more sidelink resources. If the sidelink transmission includes the one or more sidelink resources, UE A may transmit the sidelink transmission using the entire set of sidelink resources. In some aspects, the sidelink transmission may omit a first resource of the one or more sidelink resources and may include a second resource of the one or more sidelink resources.
[0130] Fig. 10 is a diagram illustrating an example 1000 of including or omitting sidelink resources as candidate resources based at least in part on an outcome of an LBT operation, in accordance with the present disclosure. Example 1000 shows a rule in which UE A includes or omits resources as candidate resources based at least in part on whether an LBT operation of UE A, relating to a set of sidelink resources 1005, is successful. The one or more sidelink resources of the reservation are shown by reference number 1010, and include a slot 2, a slot 3, and a slot 6.
[0131] In example 1000, UE A omits the one or more sidelink resources as candidate resources if an LBT operation of UE A, with regard to a sidelink resource preceding the one or more sidelink resources, fails. For example, if UE A does not have a COT during a sidelink resource 1015 preceding a single sidelink resource 1020 of the one or more sidelink resources, UE A may omit the single sidelink resource 1020 as candidate resources of the set of sidelink resources 1005. As another example, if UE A does not have a COT during a sidelink resource 1025 preceding a first sidelink resource 1030 of a group of contiguous sidelink resources of the one or more sidelink resources (in this example, slot 2 and slot 3) , then UE A may omit the group of contiguous sidelink resources from the set of sidelink resources 1005. Thus, whether UE A respects UE B’s reservation of the one or more sidelink resources may depend on an LBT outcome of the slot preceding the excluded slot. The LBT operation can be performed specifically for the slot preceding the excluded slot, or the slot preceding the excluded slot can be included in a COT obtained as part of an LBT operation prior to this slot.
[0132] In some aspects, UE A can re-evaluate the selected resources of the MCST (e.g., the set of sidelink resources) at a time T3 before a first slot of the MCST. If one or more slots are excluded due to UE B’s reservation (for example, slot 2, slot 3, and slot 6 in the middle of the MCST) , UE A may leave the exclusion pending (e.g., include the one or more slots in the selected resources of the MCST) if a previous slot is retained. For example, if slot 1 and slot 5 are retained, then slot 2, slot 3, and slot 6 are provisionally retained as part of the selected resources of the MCST until a condition is met. If the previous slot experiences LBT failure, UE A may omit the following slot (s) of the reservation. For example, if slot 1 experiences LBT failure, slot 2 and slot 3 may be dropped from the selected resources of the MCST, and if slot 5 LBT succeeds, slot 6 may be included in the selected resources of the MCST.
[0133] Fig. 11 is a diagram illustrating an example 1100 of omitting or including sidelink resources as candidate resources based at least in part on a resource exclusion threshold and an offset associated with the MCST. Example 1100 relates to a resource exclusion threshold. The resource exclusion threshold may be based at least in part on the RSRP threshold described with regard to Fig. 8. As noted above, resources indicated by a reservation that is received with an RSRP above the RSRP threshold are excluded from candidate resource identification and thus resource selection. Thus, the RSRP threshold enforces that a reservation be transmitted by a UE B that is sufficiently close to the UE A as to warrant honoring the reservation.
[0134] In example 1100, UE A includes or omits sidelink resources 1105, of one or more sidelink resources, as candidate resources based at least in part on the resource exclusion threshold, where the resource exclusion threshold includes an offset associated with the MCST. The offset may be associated with the MCST because the offset applies for exclusion of reserved resources that occur within a set of sidelink resources of an MCST. The offset may include an RSRP value (e.g., a number of decibels) . The resource exclusion threshold may be defined as:
[0135] Resource exclusion threshold = RSRP threshold + offset.
[0136] In some aspects, a magnitude of the offset may be based at least in part on a duration of the MCST. For example, a longer MCST duration may be associated with a larger offset, and a shorter MCST duration may be associated with a shorter offset. Thus, the likelihood of interruption of the longer MCST is lower than the likelihood of interruption of the shorter MCST, since the resource exclusion threshold is higher for the longer MCST.
[0137] In some aspects, a magnitude of the offset is based at least in part on (e.g., proportional to) a length of time starting at a first resource of the one or more sidelink resources and ending at an end of the MCST, as shown by reference numbers 1110 and 1115. For example, reference number 1110 shows a case where there are 5 remaining slots in the MCST, and the offset has a value ΔP1. Reference number 1115 shows a case where there are 2 remaining slots in the MCST, and the offset has a value ΔP2. ΔP1 may be greater than ΔP2. Thus, selected resources toward a beginning of the MCST (such as in reference number 1110) may be more difficult to exclude from the MCST than selected resources toward an end of the MCST. In this example, the offset may be constant for all reserved slots. For example, ΔP1 may be constant for all reserved slots of reference number 1110.
[0138] In some aspects, a slot in the middle of the MCST may have a higher offset than a slot toward a beginning of the MCST or a slot toward an end of the MCST. For example, a first slot and / or a last slot of the MCST may have an offset ΔP2 and one or more slots between the first slot and the last slot may have an offset ΔP1. ΔP1 may be greater than ΔP2. Thus, the COT for the MCST is less likely to be interrupted due to ceasing transmission of the MCST.
[0139] Fig. 12 is a diagram illustrating an example 1200 of omitting or including sidelink resources as candidate resources according to a first priority associated with the sidelink transmission, a second priority associated with the reservation, and whether an initial resource of the reservation (e.g., an earliest slot of the reservation) occurs before (e.g., immediately preceding) an initial resource of the sidelink transmission (e.g., an earliest slot of the sidelink transmission) , in accordance with the present disclosure. In example 1200, UE B’s reserved resources are shown by reference number 1205, and UE A’s set of sidelink resources for the MCST are shown by reference number 1210. In example 1200, if a second priority of UE B’s reserved resources is lower than a first priority of the sidelink transmission (e.g., the MCST) , UE A may only use the RSRP threshold (the RSRP threshold described with regard to Fig. 8, or the resource exclusion threshold described with regard to Fig. 11) to exclude a resource as candidate resources when a starting position 1215 (e.g., an initial resource) of the sidelink transmission is later than a starting position 1220 (e.g., an initial resource) of the reserved resource. For example, UE A may not respect UE B’s reservation if UE B’s reservation has a lower priority than the MCST and if UE B’s reservation starts after UE A’s sidelink transmission.
[0140] Fig. 13 is a diagram illustrating an example 1300 of omitting or including sidelink resources as candidate resources according to respective priorities of slots of an MCST, in accordance with the present disclosure. A set of sidelink resources (e.g., slots) of an MCST is shown by reference number 1305. Each sidelink resource is associated with a respective priority. In some other aspects, each of the sidelink resources may be associated with a same priority.
[0141] In example 1300, a sidelink resource 1310 is reserved by UE B. In some aspects, UE A may determine an RSRP threshold for re-evaluation (e.g., may determine whether to omit or include the sidelink resource 1310 as candidate resources) based at least in part on a first priority of the MCST and a second priority of UE B (i.e., a UE associated with the reservation, such as a UE that transmits the reservation) . As mentioned, in some aspects, different sidelink resources may be associated with different priorities. In some aspects, as shown by reference number 1315, UE A may use a highest priority of all sidelink resources of the MCST (e.g., a priority of 2) . If UE A excludes the sidelink resource 1310 from the set of candidate sidelink resources (e.g., according to the RSRP threshold described above) , then UE A may remove all sidelink resources of the MCST from the set of available candidate resources. In some other aspects, as shown by reference number 1320, UE A may select a highest priority of sidelink resources starting at a first (e.g., earliest) sidelink resource 1310 reserved by UE B, and ending at an end (e.g., a last, latest sidelink resource) of the MCST. If UE A excludes the sidelink resource 1310 from the set of candidate sidelink resources (e.g., according to the RSRP threshold described above) , then UE A may remove all sidelink resources starting at a first (e.g., earliest) sidelink resource 1310 reserved by UE B, and ending at an end (e.g., a last, latest sidelink resource) of the MCST, from the MCST.
[0142] Fig. 14 is a diagram illustrating an example 1400 of omitting or including sidelink resources as candidate resources according to an LBT type of a reserved resource, in accordance with the present disclosure.
[0143] An LBT operation may be associated with an LBT type. The LBT type may indicate parameters of the LBT operation. A Type1 LBT operation may include a Category 4 LBT with a contention window, which may be used to initiate a COT. A Type2 LBT operation may involve a fixed sensing period. A Type2A LBT operation has a fixed sensing period of 25 microseconds, whereas a Type2B LBT operation has a fixed sensing period of 16 microseconds. In some aspects, a reservation for a resource (e.g., SCI carrying the reservation) may include a field indicating an LBT type of an LBT operation that will be performed to obtain a COT for transmission on the resource (e.g., the future reserved resource) . If UE B can determine that the future reserved resource is in UE B’s COT, or in a shared COT of another UE shared with UE B, then UE B may indicate a Type2 LBT for the reserved resource. Otherwise, UE B may indicate a Type1 LBT for the reserved resource.
[0144] In some aspects, UE A may omit or include a reserved resource in an MCST according to an RSRP threshold (such as the RSRP threshold of Fig. 8 or the resource exclusion threshold described elsewhere herein) and an LBT type of the reserved resource. For example, if an RSRP of a SCI reserving M sidelink resources is above the RSRP threshold, and the LBT type of the reserved resource is a Type2 LBT, then UE A may remove the M sidelink resources from N candidate resources of UE A. Otherwise (e.g., if the LBT type of the reserved resource is a Type1 LBT) , UE A may include the M sidelink resources in the N candidate resources (e.g., UE A may not respect this resource reservation) . For example, a reserved resource with Type1 LBT may not be able to pass the LBT with a relative high probability, so it is reasonable for UE A not to respect this resource reservation information.
[0145] In some aspects, UE B may reserve a first sidelink resource (e.g., a first slot) of a set of sidelink resources for the MCST. For example, UE A may be a responding UE. UE A may detect that the first sidelink resource is reserved by UE B, and may determine that one or more resources of MCST are no longer available (such as according to the RSRP of the SCI being above an RSRP threshold and the LBT type being a Type 2 LBT) . In this scenario, UE A may include the first sidelink resource (and / or a remainder of the resources of the MCST) as candidate resources if a Type2A LBT of UE A, for the MCST, succeeds. UE A may omit the first sidelink resource (and other resources reserved by UE B) from candidate resources if the Type 2A LBT of UE A fails. In some aspects, as shown by reference number 1405, the Type 2A LBT may start at a starting position of a first (e.g., next) automatic gain control (AGC) symbol of the set of sidelink symbols (e.g., the UE A may not perform cyclic prefix extension (CPE) ) . This may enable UE A to perform LBT for the set of sidelink resources later than UE B (for the reserved resource) . In some other aspects, as shown by reference number 1410, the Type2A LBT may incorporate a CPE with a 25 microsecond gap. This may prevent other UEs from obtaining a COT that would be used for the set of sidelink resources.
[0146] As indicated above, Figs. 9-14 are provided as examples. Other examples may differ from what is described with regard to Figs. 9-14.
[0147] Fig. 15 is a flowchart of an example method 1500 of wireless communication. The method 1500 may be performed at, for example, a UE (e.g., UE 120) or an apparatus of a UE.
[0148] Method 1500 begins at 1510 with selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises an MCST. For example, the UE may select a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises an MCST, as described above in connection with, for example, Fig. 9 and at 910.
[0149] Method 1500 then proceeds at 1520 with receiving a reservation indicating one or more sidelink resources of the set of sidelink resources. For example, the UE may receive a reservation indicating one or more sidelink resources of the set of sidelink resources, as described above in connection with, for example, Fig. 9 and at 920.
[0150] Method 1500 then proceeds at 1530 with transmitting the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST. For example, the UE may transmit the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission (e.g., for resource re-evaluation for the sidelink transmission) based at least in part on the sidelink transmission comprising the MCST, as described above in connection with, for example, Fig. 9 and at 930.
[0151] In some aspects, the sidelink transmission omits the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST.
[0152] In some aspects, the sidelink transmission includes the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST.
[0153] In some aspects, the sidelink transmission omits the one or more sidelink resources if a listen-before-talk (LBT) operation of a sidelink resource preceding the one or more sidelink resources fails.
[0154] In some aspects, the sidelink resource immediately precedes a first sidelink resource of the one or more sidelink resources.
[0155] In some aspects, the sidelink transmission includes the one or more sidelink resources if an LBT operation of a sidelink resource preceding the one or more sidelink resources succeeds.
[0156] In some aspects, the sidelink transmission omits the one or more sidelink resources if a resource exclusion threshold that includes an offset associated with the MCST is not satisfied.
[0157] In some aspects, a magnitude of the offset is based at least in part on a duration of the MCST.
[0158] In some aspects, a magnitude of the offset is proportional to a length of time starting at a first resource of the one or more sidelink resources and ending at an end of the MCST.
[0159] In some aspects, a magnitude of the offset is different for a first sidelink resource of the set of sidelink resources than for a second sidelink resource of the set of sidelink resources.
[0160] In some aspects, the sidelink transmission omits or includes the one or more sidelink resources according to a first priority associated with the sidelink transmission, a second priority associated with the reservation, and whether an initial resource of the reservation occurs before an initial resource of the sidelink transmission.
[0161] In some aspects, the sidelink transmission omits or includes the one or more sidelink resources according to a resource exclusion threshold and an LBT type associated with the reservation.
[0162] In some aspects, the reservation includes information indicating the LBT type.
[0163] In some aspects, the one or more sidelink resources include one or more single-slot sidelink resources, and the sidelink transmission omits or includes the one or more sidelink resources according to a resource exclusion threshold that is based at least in part on a first priority of the set of sidelink resources and a second priority of another UE associated with the reservation.
[0164] In some aspects, the first priority is a highest priority selected from priorities associated with the set of sidelink resources.
[0165] In some aspects, the first priority is based at least in part on a span starting at a first sidelink resource of the reservation and ending at a last sidelink resource of the MCST.
[0166] In some aspects, the one or more sidelink resources include a first slot of the set of sidelink resources, wherein the reservation is associated with a threshold measurement value, and wherein transmitting the sidelink transmission further comprises transmitting the sidelink transmission on the set of sidelink resources in accordance with a successful Type 2A LBT.
[0167] In some aspects, a starting position of the Type 2A LBT is a starting position of a first symbol of the set of sidelink resources.
[0168] In some aspects, a starting position of the Type 2A LBT is a starting position associated with a cyclic prefix extension prior to the set of sidelink resources.
[0169] In some aspects, method 1500 includes performing resource re-evaluation regarding the set of sidelink resources, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on a result of the resource re-evaluation.
[0170] In one aspect, method 1500, or any aspect related to it, may be performed by an apparatus, such as communications device 1600 of Fig. 16, which includes various components operable, configured, or adapted to perform the method 1500. Communications device 1600 is described below in further detail.
[0171] Although Fig. 15 shows example blocks of method 1500, in some aspects, method 1500 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 15. Additionally, or alternatively, two or more of the blocks of method 1500 may be performed in parallel.
[0172] Fig. 16 is a diagram illustrating an example of an implementation of code and circuitry for a communications device 1600, in accordance with the present disclosure. The communications device 1600 may be a UE, or a UE may include the communications device 1600.
[0173] The communications device 1600 includes a processing system 1602 coupled to a transceiver 1608 (e.g., a transmitter and / or a receiver, and which may include a single transceiver or multiple transceivers which may perform different operations described as being performed by the transceiver 1608) . The transceiver 1608 is configured to transmit and receive signals for the communications device 1600 via an antenna 1610, such as the various signals as described herein. The processing system 1602 may be configured to perform processing functions for the communications device 1600, including processing signals received and / or to be transmitted by the communications device 1600.
[0174] The processing system 1602 includes one or more processors 1620. In various aspects, the one or more processors 1620 may include one or more of receive processor 258, transmit processor 264, TX MIMO processor 266, and / or controller / processor 280, as described with respect to Fig. 2. The one or more processors 1620 are coupled to a computer-readable medium / memory 1630 via a bus 1606. In various aspects, the computer-readable medium / memory 1630 may include one or more memories such as memory 282, as described with respect to Fig. 2. In certain aspects, the computer-readable medium / memory 1630 is configured to store instructions (e.g., computer-executable code, processor-executable code) that when executed by the one or more processors 1620, cause the one or more processors 1620 to perform the method 1500 described with respect to Fig. 15, or any aspect related to it. Note that reference to a processor performing a function of communications device 1600 may include one or more processors performing that function of communications device 1600. Note also that reference to one or more processors performing multiple functions may include a first processor performing a first function of the multiple functions and a second processor performing a second function of the multiple functions.
[0175] As shown in Fig. 16, the communications device 1600 may include circuitry for selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises an MCST (circuitry 1635) .
[0176] As shown in Fig. 16, the communications device 1600 may include, stored in computer-readable medium / memory 1630, code for selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises an MCST (code 1640) .
[0177] As shown in Fig. 16, the communications device 1600 may include circuitry for receiving a reservation indicating one or more sidelink resources of the set of sidelink resources (circuitry 1645) .
[0178] As shown in Fig. 16, the communications device 1600 may include, stored in computer-readable medium / memory 1630, code for receiving a reservation indicating one or more sidelink resources of the set of sidelink resources (code 1650) .
[0179] As shown in Fig. 16, the communications device 1600 may include circuitry for transmitting the sidelink transmission (circuitry 1655) .
[0180] As shown in Fig. 16, the communications device 1600 may include, stored in computer-readable medium / memory 1630, code for transmitting the sidelink transmission (code 1660) .
[0181] Various components of the communications device 1600 may provide means for performing the method 1500 described with respect to Fig. 15, or any aspect related to it. For example, means for transmitting, sending, or outputting for transmission may include the transceiver (s) 254 and / or antenna (s) 252 of the UE 120 and / or transceiver 1608 and antenna 1610 of the communications device 1600 in Fig. 16. Means for receiving or obtaining may include the transceiver (s) 254 and / or antenna (s) 252 of the UE 120 and / or transceiver 1608 and antenna 1610 of the communications device 1600 in Fig. 16.
[0182] Fig. 16 is provided as an example. Other examples may differ from what is described in connection with Fig. 16.
[0183] The following provides an overview of some Aspects of the present disclosure:
[0184] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises a multiple-consecutive-slot transmission (MCST) ; receiving a reservation indicating one or more sidelink resources of the set of sidelink resources; and transmitting the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST.
[0185] Aspect 2: The method of Aspect 1, wherein the sidelink transmission omits the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST.
[0186] Aspect 3: The method of any of Aspects 1-2, wherein the sidelink transmission includes the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST.
[0187] Aspect 4: The method of any of Aspects 1-3, wherein the sidelink transmission omits the one or more sidelink resources if a listen-before-talk (LBT) operation of a sidelink resource preceding the one or more sidelink resources fails.
[0188] Aspect 5: The method of Aspect 4, wherein the sidelink resource immediately precedes a first sidelink resource of the one or more sidelink resources.
[0189] Aspect 6: The method of any of Aspects 1-5, wherein the sidelink transmission includes the one or more sidelink resources if a listen-before-talk (LBT) operation of a sidelink resource preceding the one or more sidelink resources succeeds.
[0190] Aspect 7: The method of any of Aspects 1-6, wherein the sidelink transmission omits the one or more sidelink resources if a resource exclusion threshold that includes an offset associated with the MCST is not satisfied.
[0191] Aspect 8: The method of Aspect 7, wherein a magnitude of the offset is based at least in part on a duration of the MCST.
[0192] Aspect 9: The method of Aspect 7, wherein a magnitude of the offset is proportional to a length of time starting at a first resource of the one or more sidelink resources and ending at an end of the MCST.
[0193] Aspect 10: The method of Aspect 7, wherein a magnitude of the offset is different for a first sidelink resource of the set of sidelink resources than for a second sidelink resource of the set of sidelink resources.
[0194] Aspect 11: The method of any of Aspects 1-10, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission according to a first priority associated with the sidelink transmission, a second priority associated with the reservation, and whether an initial resource of the reservation occurs before an initial resource of the sidelink transmission.
[0195] Aspect 12: The method of any of Aspects 1-11, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission according to a resource exclusion threshold and a listen-before-talk (LBT) type associated with the reservation.
[0196] Aspect 13: The method of Aspect 12, wherein the reservation includes information indicating the LBT type.
[0197] Aspect 14: The method of any of Aspects 1-13, wherein the one or more sidelink resources include one or more single-slot sidelink resources, and wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission according to a resource exclusion threshold that is based at least in part on a first priority of the set of sidelink resources and a second priority of another UE associated with the reservation.
[0198] Aspect 15: The method of Aspect 14, wherein the first priority is a highest priority selected from priorities associated with the set of sidelink resources.
[0199] Aspect 16: The method of Aspect 14, wherein the first priority is based at least in part on a span starting at a first sidelink resource of the reservation and ending at a last sidelink resource of the MCST.
[0200] Aspect 17: The method of any of Aspects 1-16, wherein the one or more sidelink resources include a first slot of the set of sidelink resources, wherein the reservation is associated with a threshold measurement value, and wherein transmitting the sidelink transmission further comprises transmitting the sidelink transmission on the set of sidelink resources in accordance with a successful Type 2A LBT.
[0201] Aspect 18: The method of Aspect 17, wherein a starting position of the Type 2A LBT is a starting position of a first symbol of the set of sidelink resources.
[0202] Aspect 19: The method of Aspect 17, wherein a starting position of the Type 2A LBT is a starting position associated with a cyclic prefix extension prior to the set of sidelink resources.
[0203] Aspect 20: The method of any of Aspects 1-19, further comprising performing resource re-evaluation regarding the set of sidelink resources, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on a result of the resource re-evaluation.
[0204] Aspect 21: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-20.
[0205] Aspect 22: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-20.
[0206] Aspect 23: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-20.
[0207] Aspect 24: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-20.
[0208] Aspect 25: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-20.
[0209] Aspect 26: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-20.
[0210] Aspect 27: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-20.
[0211] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.
[0212] As used herein, the term “component” is intended to be broadly construed as hardware and / or a combination of hardware and software. “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a “processor” is implemented in hardware and / or a combination of hardware and software. It will be apparent that systems and / or methods described herein may be implemented in different forms of hardware and / or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, since those skilled in the art will understand that software and hardware can be designed to implement the systems and / or methods based, at least in part, on the description herein.
[0213] As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, or the like.
[0214] Even though particular combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features may be combined in ways not specifically recited in the claims and / or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (e.g., a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c) .
[0215] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more. ” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” or the like are intended to be open-ended terms that do not limit an element that they modify (e.g., an element “having” A may also have B) . Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or, ” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of” ) .
[0216] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limiting of the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various actions may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
[0217] The various illustrative logical blocks, modules, and circuits described in connection with the present disclosure may be implemented or performed with a general purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device (PLD) , 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 the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC) , or any other such configuration) .
[0218] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) , and the like. Also, “determining” may include resolving, selecting, choosing, establishing, and the like.
[0219] Reference to an element in the singular is not intended to mean only one unless specifically so stated, but rather “one or more. ” For example, reference to an element (e.g., “aprocessor, ” “acontroller, ” “amemory, ” etc. ) , unless otherwise specifically stated, should be understood to refer to one or more elements (e.g., “one or more processors, ” “one or more controllers, ” “one or more memories, ” etc. ) .
[0220] Where reference is made to one or more elements performing functions (e.g., steps of a method) , one element may perform all functions, or more than one element may collectively perform the functions. When more than one element collectively performs the functions, each function need not be performed by each of those elements (e.g., different functions may be performed by different elements) and / or each function need not be performed in whole by only one element (e.g., different elements may perform different sub-functions of a function) . Similarly, where reference is made to one or more elements configured to cause another element (e.g., an apparatus) to perform functions, one element may be configured to cause the other element to perform all functions, or more than one element may collectively be configured to cause the other element to perform the functions.
[0221] The methods disclosed herein comprise one or more actions for achieving the methods. The method actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. Further, the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and / or software component (s) and / or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or a processor.
[0222] The following claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims. Within a claim, reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” Unless specifically stated otherwise, the term “some” refers to one or more. No claim element is to be construed under the provisions of 35 U.S.C. §112 (f) unless the element is expressly recited using the phrase “means for” . All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.
Claims
1.An apparatus configured for wireless communication, comprising:one or more memories comprising processor-executable instructions; andone or more processors configured to execute the processor-executable instructions and cause the apparatus to:select a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises a multiple-consecutive-slot transmission (MCST) ;receive a reservation indicating one or more sidelink resources of the set of sidelink resources; andtransmit the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST.2.The apparatus of claim 1, wherein the sidelink transmission omits the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST.3.The apparatus of claim 1, wherein the sidelink transmission includes the one or more sidelink resources based at least in part on the sidelink transmission comprising the MCST.4.The apparatus of claim 1, wherein the sidelink transmission omits the one or more sidelink resources if a listen-before-talk (LBT) operation of a sidelink resource preceding the one or more sidelink resources fails.5.The apparatus of claim 4, wherein the sidelink resource immediately precedes a first sidelink resource of the one or more sidelink resources.6.The apparatus of claim 1, wherein the sidelink transmission includes the one or more sidelink resources if a listen-before-talk (LBT) operation of a sidelink resource preceding the one or more sidelink resources succeeds.7.The apparatus of claim 1, wherein the sidelink transmission omits the one or more sidelink resources if a resource exclusion threshold that includes an offset associated with the MCST is not satisfied.8.The apparatus of claim 7, wherein a magnitude of the offset is based at least in part on a duration of the MCST.9.The apparatus of claim 7, wherein a magnitude of the offset is proportional to a length of time starting at a first resource of the one or more sidelink resources and ending at an end of the MCST.10.The apparatus of claim 7, wherein a magnitude of the offset is different for a first sidelink resource of the set of sidelink resources than for a second sidelink resource of the set of sidelink resources.11.The apparatus of claim 1, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission according to a first priority associated with the sidelink transmission, a second priority associated with the reservation, and whether an initial resource of the reservation occurs before an initial resource of the sidelink transmission.12.The apparatus of claim 1, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission according to a resource exclusion threshold and a listen-before-talk (LBT) type associated with the reservation.13.The apparatus of claim 12, wherein the reservation includes information indicating the LBT type.14.The apparatus of claim 1, wherein the one or more sidelink resources include one or more single-slot sidelink resources, and wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission according to a resource exclusion threshold that is based at least in part on a first priority of the set of sidelink resources and a second priority of another UE associated with the reservation.15.The apparatus of claim 14, wherein the first priority is a highest priority selected from priorities associated with the set of sidelink resources.16.The apparatus of claim 14, wherein the first priority is based at least in part on a span starting at a first sidelink resource of the reservation and ending at a last sidelink resource of the MCST.17.The apparatus of claim 1, wherein the one or more sidelink resources include a first slot of the set of sidelink resources, wherein the reservation is associated with a threshold measurement value, and wherein the one or more processors, to cause the apparatus to transmit the sidelink transmission, are configured to cause the apparatus to transmit the sidelink transmission on the set of sidelink resources in accordance with a successful Type 2A LBT.18.The apparatus of claim 17, wherein a starting position of the Type 2A LBT is a starting position of a first symbol of the set of sidelink resources.19.The apparatus of claim 17, wherein a starting position of the Type 2A LBT is a starting position associated with a cyclic prefix extension prior to the set of sidelink resources.20.The apparatus of claim 1, wherein the one or more processors are further configured to cause the apparatus to perform resource re-evaluation regarding the set of sidelink resources, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on a result of the resource re-evaluation.21.A method of wireless communication performed by a user equipment (UE) , comprising:selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises a multiple-consecutive-slot transmission (MCST) ;receiving a reservation indicating one or more sidelink resources of the set of sidelink resources; andtransmitting the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST.22.A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:one or more instructions that, when executed by one or more processors of a user equipment (UE) , cause the UE to:select a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises a multiple-consecutive-slot transmission (MCST) ;receive a reservation indicating one or more sidelink resources of the set of sidelink resources; andtransmit the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST.23.An apparatus for wireless communication, comprising:means for selecting a set of sidelink resources for a sidelink transmission, wherein the sidelink transmission comprises a multiple-consecutive-slot transmission (MCST) ;means for receiving a reservation indicating one or more sidelink resources of the set of sidelink resources; andmeans for transmitting the sidelink transmission, wherein the one or more sidelink resources are included as candidate resources, or excluded from the candidate resources, for the sidelink transmission based at least in part on the sidelink transmission comprising the MCST.
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