Ultra-Reliable Low-Latency Communication via SideLink

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a transmitter user equipment (UE) may transmit a stage 1 sidelink control information (SCI) message to multiple receiver UEs. In some aspects, the stage 1 SCI message may indicate respective resource reservations for multiple sidelink transmissions to the multiple receiver UEs. The transmitter UE may transmit a physical sidelink shared channel (PSSCH) to a subset of the multiple receiver UEs based at least in part on configured grants associated with the subset of the multiple receiver UEs and the respective resource reservations indicated in the stage 1 SCI message. Numerous other aspects are provided.

Description

Technical Field

[0001] Cross - reference to Related Applications

[0001] This patent application claims the benefit of priority of U.S. Non - Provisional Patent Application No. 16 / 910,810, filed on June 24, 2020, entitled "ULTRA - RELIABLE LOW - LATENCY COMMUNICATION OVER SIDELINK", and U.S. Non - Provisional Patent Application No. 16 / 910,855, filed on June 24, 2020, entitled "ULTRA - RELIABLE LOW - LATENCY COMMUNICATION OVER SIDELINK", which are hereby incorporated by reference in their entirety.

[0002]

[0002] Aspects of the present disclosure generally relate to wireless communication and, more particularly, to techniques and apparatus for ultra - reliable low - latency communication (URLLC) over a sidelink.

Background Art

[0003]

[0003] Wireless communication systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ a multiple access technology that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE (registered trademark)). LTE / LTE-Advanced is a set of extensions to the Universal Mobile Telecommunications System (UMTS) mobile standard published by the Third Generation Partnership Project (3GPP (registered trademark)).

[0004]

[0004] A wireless network may include several base stations (BSs) that can support communication for several user equipments (UEs). The user equipment (UE) can communicate with the base station (BS) via the downlink and the uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, the BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0005]

[0005] The above multi-connection technology is adopted in various telecommunications standards to provide a common protocol that enables different user devices to communicate on an urban, national, regional, and even global scale. New Radio (NR), sometimes called 5G, is a set of extensions to the LTE mobile standard published by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards by using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) and using CP-OFDM and / or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to grow, further development in LTE, NR, and other wireless access technologies remains useful.

Summary of the Invention

[0006]

[0006] In some aspects, a method of wireless communication performed by a transmitter user equipment (UE) may include transmitting a stage one sidelink control information (SCI) message to a plurality of receiver UEs, wherein the stage one SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and transmitting a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiver UEs, at least partially based on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the stage one SCI message.

[0007]

[0007] In some aspects, a transmitter UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to transmit a stage one SCI message to a plurality of receiver UEs, wherein the stage one SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and transmit a PSSCH to a subset of the plurality of receiver UEs, at least partially based on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the stage one SCI message.

[0008]

[0008] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a transmitter UE, the one or more processors are caused to transmit a stage 1 SCI message to a plurality of receiver UEs, where the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and to transmit a PSSCH to a subset of the plurality of receiver UEs, at least partially based on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the stage 1 SCI message.

[0009]

[0009] In some aspects, an apparatus for wireless communication may include means for transmitting a stage 1 SCI message to a plurality of receiver UEs, where the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and means for transmitting a PSSCH to a subset of the plurality of receiver UEs, at least partially based on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the stage 1 SCI message.

[0010]

[0010] Aspects are generally described herein with reference to the drawings and the description, and include, as shown by the drawings and the description, methods, devices, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems.

[0011]

[0011] The above gives a rather broad overview of the features and technical advantages of examples according to the present disclosure so that the forms for carrying out the following inventions can be better understood. Additional features and advantages are described below. The disclosed concepts and specific examples can be readily utilized as a basis for modifying or designing other structures for carrying out the same objectives of the present disclosure. Such equivalent configurations do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both their composition and manner of operation, will be better understood from the following description in connection with the accompanying drawings, together with the associated advantages. Each of the drawings is provided for purposes of illustration and description and is not provided as a definition of the limitations of the claims.

[0012]

[0012] To enable a more detailed understanding of the features set forth above in the present disclosure, a more specific description, briefly summarized above, can be obtained by referring to the manner in which a part thereof is shown in the accompanying drawings. However, it should be noted that since the description can lead to other equally effective manners, the accompanying drawings show only some exemplary manners of the present disclosure and thus should not be considered as limiting the scope of the present disclosure. The same reference numerals in different drawings can identify the same or similar elements.

Brief Description of the Drawings

[0013]

Figure 1

[0013] A diagram showing an example of a wireless network according to various aspects of the present disclosure.

Figure 2

[0014] A diagram showing an example of a base station communicating with a UE in a wireless network according to various aspects of the present disclosure.

Figure 3

[0015] A diagram showing an example of sidelink communication according to various aspects of the present disclosure.

Figure 4

[0016] A diagram showing an example of sidelink communication and access link communication according to various aspects of the present disclosure.

Figure 5

[0017] A diagram showing an example of delay-constrained deployment according to various aspects of the present disclosure.

Figure 6A

[0018] A diagram showing an example of ultra-reliable low-latency communication (URLLC) according to various aspects of the present disclosure.

Figure 6B

Figure 7

[0019] A diagram showing an example of an industrial Internet-of-Things (IIoT) deployment that supports URLLC via sidelink according to various aspects of the present disclosure.

Figure 8A

[0020] A diagram showing an example related to URLLC via sidelink according to various aspects of the present disclosure.

Figure 8B

Figure 8C

Figure 9A

[0021] A diagram showing an example related to URLLC via sidelink according to various aspects of the present disclosure.

Figure 9B

Figure 9C

Figure 9D

Figure 10

[0022] A diagram showing an exemplary process related to URLLC via sidelink according to various aspects of the present disclosure.

Figure 11

[0023] A block diagram of an exemplary apparatus for wireless communication according to various aspects of the present disclosure.

Best Mode for Carrying Out the Invention

[0014]

[0024] Various aspects of the present disclosure will be more fully described below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be construed as limited to any specific structure or function presented throughout the present 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. Based on the teachings herein, those skilled in the art should understand that the scope of the present disclosure covers any aspect of the present disclosure disclosed herein, whether implemented independently of other aspects of the present disclosure or combined with other aspects of the present disclosure. For example, an apparatus can be implemented and a method can be practiced using any number of the aspects described herein. Further, the scope of the present disclosure is intended to cover such apparatus or methods practiced using other structures, functions, or combinations of structures and functions in addition to or other than the various aspects of the present disclosure described herein. It should be understood that any aspect of the disclosure disclosed herein can be implemented by one or more elements of the claims.

[0015]

[0025] Next, some aspects of a telecommunications system are presented with reference to various devices and techniques. These devices and techniques are described in the following detailed description and are shown in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0016]

[0026] In this specification, aspects may be described using terminology generally associated with 5G or NR radio access technology (RAT), but it should be noted that aspects of the present disclosure may be applicable to other RATs such as 3G RAT, 4G RAT, and / or a RAT following 5G (e.g., 6G).

[0017]

[0027] FIG. 1 is a diagram showing an example of a wireless network 100 according to various aspects of the present disclosure. The wireless network 100 may be or may include elements such as a 5G (NR) network, an LTE network, etc. The wireless network 100 may include several base stations 110 (shown as BS110a, BS110b, BS110c, and BS110d) and other network entities. A base station (BS) is an entity that communicates with user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, transmission and reception point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to the coverage area of the BS and / or BS subsystem serving this coverage area depending on the context in which the term is used.

[0018]

[0028] A BS may provide communication coverage to a macrocell, picocell, femtocell, and / or another type of cell. A macrocell may cover a relatively large geographical area (e.g., several kilometers in radius) and may enable unrestricted access by UEs subscribed to the service. A picocell may cover a relatively small geographical area and may enable unrestricted access by UEs subscribed to the service. A femtocell may cover a relatively small geographical area (e.g., a home) and may enable restricted access by UEs associated with the femtocell (e.g., UEs within a Closed Subscriber Group (CSG)). The BS for a macrocell may sometimes be called a macro BS. The BS for a picocell may sometimes be called a pico BS. The BS for a femtocell may sometimes be called a femto BS or a home BS. In the example shown in FIG. 1, BS110a may be a macro BS for macrocell 102a, BS110b may be a pico BS for picocell 102b, and BS110c may be a femto BS for femtocell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0019]

[0029] In some aspects, a cell may not necessarily be fixed, and the geographical area of a cell may move according to the location of a mobile BS. In some aspects, BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as direct physical connections, virtual networks, using any suitable transport network.

[0020]

[0030] Wireless network 100 may also include relay stations. A relay station is an entity that can receive the transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of that data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. In the example shown in FIG. 1, relay station 110d can communicate with BS 110a and UE 120d to enable communication between macro BS 110a and UE 120d. Relay stations may also be referred to as relay BSs, relay base stations, relays, etc.

[0021]

[0031] Wireless network 100 can be a heterogeneous network that includes different types of BSs, such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs can have different transmission power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, a macro BS can have a high transmission power level (e.g., 5 - 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmission power levels (e.g., 0.1 - 2 watts).

[0022]

[0032] Network controller 130 can be coupled to a set of BSs and can perform the coordination and control of these BSs. Network controller 130 can communicate with the BSs via a backhaul. The BSs can also communicate with each other directly or indirectly, for example, via a wireless or wireline backhaul.

[0023]

[0033] UE120 (e.g., 120a, 120b, 120c) can be distributed throughout the wireless network 100, and each UE can be fixed or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE can be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or instrument, a biosensor / biodevice, a wearable device (smartwatch, smart clothing, smart glasses, smart list band, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music device or a video device, or a satellite radio), a vehicle component or vehicle sensor, a smart meter / smart sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0024]

[0034] Some UEs may be regarded as machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and eMTC UEs can communicate with, for example, a base station, another device (such as a remote device), or some other entity, including robots, drones, remote devices, sensors, meters, monitors, location tags, etc. A wireless node can provide connectivity for a network (such as a wide area network like the Internet or a cellular network) or to a network, for example, via a wired or wireless communication link. Some UEs may be regarded as Internet of Things (IoT) devices and / or may be implemented as narrowband Internet of Things (NB-IoT) devices. Some UEs may be regarded as customer premise equipment (CPE). UE120 may be included within a housing that stores components of UE120, such as a processor component, a memory component, etc. In some aspects, the processor component and the memory component may be coupled together. For example, the processor component (such as one or more processors) and the memory component (such as a memory) can be operably coupled, communicatively coupled, electronically coupled, electrically coupled, etc.

[0025]

[0035] Generally, any number of wireless networks can be deployed within a given geographical area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. RAT may also be referred to as a wireless technology, an air interface, etc. A frequency may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT within a given geographical area to avoid interference between wireless networks of different RATs. In some cases, a New Radio (NR) or 5G RAT network may be deployed.

[0026]

[0036] In some aspects, two or more UEs 120 (such as those shown as UE120a and UE120e) may communicate directly using one or more sidelink channels (e.g., without using the base station 110 as a medium for communicating with each other). For example, the UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (which may include, for example, vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), a mesh network, and the like. In this case, the UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere in this specification as being performed by the base station 110.

[0027]

[0037] Devices of the wireless network 100 may communicate using an electromagnetic spectrum that can be re - divided into various classes, bands, channels, etc. based on frequency or wavelength. For example, devices of the wireless network 100 may communicate using an operating band having a first frequency range (FR1) that can span from 410 MHz to 7.125 GHz, and / or may communicate using an operating band having a second frequency range (FR2) that can span from 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 may sometimes be referred to as mid - band frequencies. A portion of FR1 is greater than 6 GHz, but FR1 is often referred to as the "sub - 6 GHz" band. Similarly, although FR2 is different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified as the "millimeter - wave" band by the International Telecommunication Union (ITU), it is often referred to as the "millimeter - wave". Thus, unless otherwise specified, terms such as "sub - 6 GHz" when used in this specification are to be understood to broadly represent frequencies less than 6 GHz, frequencies within FR1, and / or mid - band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise specified, terms such as "millimeter - wave" when used in this specification are to be understood to broadly represent frequencies within the EHF band, frequencies within FR2, and / or mid - band frequencies (e.g., less than 24.25 GHz). The frequencies included in FR1 and FR2 may be modified, and the techniques described in this specification are intended to be applicable to those modified frequency ranges.

[0028]

[0038] In some aspects, the wireless network 100 can support industrial Internet of Things (IIoT) communications, which generally refers to a derivative of cellular technology that can be used for the UE 120 and the base station 110 to communicate control data, measurement data, etc. among various industrial systems. For example, IIoT can be used to control sensor devices and / or actuator devices, and to exchange measurement information among programmable logic controllers (PLCs) in a factory floor (e.g., in factory automation applications). In many applications, IIoT traffic is treated as ultra-reliable low-latency communication (URLLC) traffic that gives strict latency and reliability requirements. In some cases, in addition to the URLLC traffic between the UE 120 and the base station 110, IIoT traffic can also use sidelink communication between UEs 120 (e.g., between a PLC UE 120 and a sensor / actuator (S / A) UE 120). For example, IIoT traffic can be used to support use cases involving a high degree of cooperation between robots and / or other industrial systems, and to offload factory traffic (e.g., using sidelink for maintenance between a maintenance tablet and an on-demand sensor without interrupting URLLC-based closed-loop control) in deployments with insufficient network coverage or no network coverage (e.g., shielded production cells).

[0029]

[0039] However, sidelink communication has relaxed service quality (QoS) requirements, lower radio efficiency for carrying traffic for communication between UE 120 and base station 110 over the access link, etc., so sidelink communication typically cannot meet stringent URLLC latency and reliability requirements. Accordingly, some aspects described herein relate to techniques and apparatus for meeting URLLC requirements over the sidelink. For example, some aspects described herein may perform an initial transmission using a configured grant or semi-persistent scheduling (SPS) configuration to reduce control overhead. Additionally or alternatively, some aspects described herein may support retransmission triggered by a negative acknowledgment (NACK) (instead of performing blind retransmissions, as in a typical sidelink implementation) to improve radio efficiency. Additionally or alternatively, some aspects described herein may utilize mini-slot based resource allocation to reduce transmission time, provide multiple switching points within a slot, and enable fast switching (e.g., between transmission directions) within a slot. In this way, sidelink communication in latency-constrained deployments such as IIoT deployments may meet stringent latency and reliability requirements.

[0030]

[0040] As described above, FIG. 1 is provided as an example. Other examples may be different from those described with respect to FIG. 1.

[0031]

[0041] FIG. 2 is a diagram illustrating an example 200 of base station 110 communicating with UE 120 in wireless network 100 according to various aspects of the present disclosure. Base station 110 may be equipped with T antennas 234a - 234t, and UE 120 may be equipped with R antennas 252a - 252r, where generally T ≧ 1 and R ≧ 1.

[0032]

[0042] At base station 110, transmission processor 220 receives data from data source 212 for one or more UEs, selects one or more modulation and coding schemes (MCSs) for each UE based at least in part on the channel quality indicator (CQI) received from the UE, processes (e.g., encodes and modulates) the data for each UE based at least in part on the selected (one or more) MCS for that UE, and may provide data symbols for all UEs. Transmission processor 220 may also process system information and control information (e.g., CQI requests, grants, upper layer signaling, etc.) (e.g., for semi-static resource partitioning information (SRPI)), and may provide overhead symbols and control symbols. Transmission processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signal (CRS), demodulation reference signal (DMRS), etc.), and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). Transmission (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a - 232t. Each modulator 232 may process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process the output sample stream (e.g., convert to analog, amplify, filter, and upconvert) to obtain a downlink signal. The T downlink signals from modulators 232a - 232t may be transmitted via T antennas 234a - 234t, respectively.

[0033]

[0043] In UE120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, and may provide the received signals to demodulators (DEMOD) 254a to 254r respectively. Each demodulator 254 may adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols if applicable, and provide the detected symbols. The receiving processor 258 may process (e.g., demodulate and decode) the detected symbols, provide the decoded data for UE120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine the reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE120 may be included in the housing 284.

[0034]

[0044] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in the core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0035]

[0045] On the uplink, at UE 120, a transmission processor 264 may receive and process data from a data source 262 and control information (for example, for reports including RSRP, RSSI, RSRQ, CQI, etc.) from a controller / processor 280. The transmission processor 264 may also generate reference symbols for one or more reference signals. Symbols from the transmission processor 264 may be precoded by a TX MIMO processor 266, if applicable, and further processed by modulators 254a - 254r (for example, for DFT - s - OFDM, CP - OFDM, etc.) and transmitted to the base station 110. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of one or more antennas 252, modulators and / or demodulators 254, a MIMO detector 256, a receive processor 258, a transmission processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (for example, controller / processor 280) and memory 282 to implement any aspect of the methods described herein, as described with reference to, for example, FIGS. 7, 8A - 8C, 9A - 9D, and / or FIGS. 10 - 11.

[0036]

[0046] At base station 110, uplink signals from UE 120 and other UEs are received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 when applicable, and may be further processed by receive processor 238 to obtain the decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 includes communication unit 244 and may communicate with network controller 130 via communication unit 244. Base station 110 may include a scheduler 246 for scheduling UE 120 for downlink and / or uplink communication. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of (one or more) antennas 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to implement any aspect of the methods described herein, such as those described with reference to FIGS. 7, 8A-8C, FIGS. 9A-9D, and / or FIGS. 10-11.

[0037]

[0047] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component(s) of FIG. 2 may implement one or more techniques related to ultra-reliable low-latency communication (URLLC) via sidelink, as described in more detail elsewhere in this specification. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component(s) of FIG. 2 may perform or direct the operations of, for example, process 1000 of FIG. 10 and / or other processes described herein. Memories 242 and 282 may store data and program code for the base station 110 and the UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code, program code, etc.) for wireless communication. For example, when executed by one or more processors of the base station 110 and / or the UE 120 (e.g., directly or after compilation, conversion, interpretation, etc.), the one or more instructions may cause the one or more processors, the UE 120, and / or the base station 110 to perform or direct the operations of, for example, process 1000 of FIG. 10 and / or other processes described herein. In some aspects, executing the instructions may include operating the instructions, converting the instructions, compiling the instructions, interpreting the instructions, etc.

[0038]

[0048] In some aspects, UE120 includes means for transmitting a stage 1 sidelink control information (SCI) message to a plurality of receiving UEs120, where the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiving UEs120, and means for transmitting a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiving UEs120, at least partially based on a configured grant associated with the subset of the plurality of receiving UEs120 and each resource reservation indicated in the stage 1 SCI message. In some aspects, such means may include one or more components of UE120 described in connection with FIG. 2, such as controller / processor 280, transmission processor 264, TX MIMO processor 266, MOD254, antenna 252, DEMOD254, MIMO detector 256, reception processor 258, etc.

[0039]

[0049] Although the blocks in FIG. 2 are shown as separate components, the functions described above with respect to those blocks may be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to transmission processor 264, reception processor 258, and / or TX MIMO processor 266 may be performed by controller / processor 280, or under the control of controller / processor 280.

[0040]

[0050] As described above, FIG. 2 is provided as an example. Other examples may differ from those described in connection with FIG. 2.

[0041]

[0051] FIG. 3 is a diagram illustrating an example 300 of sidelink communication according to various aspects of the present disclosure.

[0042]

[0052] As shown in FIG. 3, a first UE 305-1 can communicate with a second UE 305-2 (and / or one or more other UEs 305) via one or more sidelink channels 310. The UE 305-1 and UE 305-2 can communicate using one or more sidelink channels 310 for P2P communication, D2D communication, IIoT communication, V2X communication (which may include, for example, V2V communication, V2I communication, V2P communication, etc.), mesh networking, and the like. In some aspects, the UE 305 (e.g., UE 305-1 and / or UE 305-2) may correspond to one or more other UEs described elsewhere in this document, such as the UE 120. In some aspects, one or more sidelink channels 310 may use a PC5 interface and / or operate in a high frequency band (e.g., 5.9 GHz band). Additionally or alternatively, the UE 305 may use global navigation satellite system (GNSS) timing to synchronize the timing of transmission time intervals (TTIs) (e.g., frames, subframes, slots, symbols, etc.).

[0043]

[0053] As further shown in FIG. 3, one or more sidelink channels 310 may include a physical sidelink control channel (PSCCH) 315, a physical sidelink shared channel (PSSCH) 320, a physical sidelink feedback channel (PSFCH) 325, and the like. The PSCCH 315 can be used to communicate control information, similar to the physical downlink control channel (PDCCH) and / or the physical uplink control channel (PUCCH) used for cellular communication with the base station 110 via an access link or an access channel. The PSSCH 320 can be used to communicate data, similar to the physical downlink shared channel (PDSCH) and / or the physical uplink shared channel (PUSCH) used for cellular communication with the base station 110 via an access link or an access channel. For example, the PSCCH 315 can carry sidelink control information (SCI) 330 that can indicate various control information used for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, spatial resources, etc.) on which a transport block (TB) 335 can be carried on the PSSCH 320. The TB 335 can include data. The PSFCH 325 can be used to communicate sidelink feedback 340, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), scheduling request (SR), and the like.

[0044]

[0054] In some aspects, one or more sidelink channels 310 may use a resource pool. For example, a scheduling allocation (e.g., included in SCI 330) may be transmitted in a sub-channel using specific resource blocks (RBs) over time. In some aspects, data transmission related to a scheduling allocation (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling allocation (e.g., using frequency division multiplexing). In some aspects, the scheduling allocation and related data transmission are not transmitted on adjacent RBs.

[0045]

[0055] In some aspects, UE 305 may operate using a transmission mode in which resource selection and / or scheduling is performed by UE 305 (e.g., rather than by base station 110). In some aspects, UE 305 may perform resource selection and / or scheduling by detecting channel availability for transmission. For example, UE 305 may measure received signal strength indicator (RSSI) parameters (e.g., sidelink RSSI (S-RSSI) parameters) related to various sidelink channels, may measure reference signal received power (RSRP) parameters (e.g., PSSCH-RSRP parameters) related to various sidelink channels, may measure reference signal received quality (RSRQ) parameters (e.g., PSSCH-RSRQ parameters) related to various sidelink channels, etc., and may select a channel for transmission of sidelink communication based at least in part on the (one or more) measurements.

[0046]

[0056] Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling using the SCI 330 received in the PSCCH 315, which may indicate occupied resources, channel parameters, etc. Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling by determining the channel busy rate (CBR) associated with various sidelink channels that may be used for rate control (e.g., by indicating the maximum number of resource blocks that can be used by the UE 305 for a particular set of subframes).

[0047]

[0057] In a transmission mode in which resource selection and / or scheduling is performed by the UE 305, the UE 305 may generate sidelink grants and may transmit those grants in the SCI 330. The sidelink grants may indicate one or more parameters (e.g., transmission parameters) to be used for a next sidelink transmission, such as one or more resource blocks to be used on the PSSCH 320 (e.g., for the TB 335), one or more subframes to be used for the next sidelink transmission, and a modulation and coding scheme (MCS) to be used for the next sidelink transmission. In some aspects, the UE 305 may generate a sidelink grant that indicates one or more parameters for SPS, such as the periodicity of sidelink transmissions. Additionally or alternatively, the UE 305 may generate a sidelink grant for event-driven scheduling, such as for on-demand sidelink messages.

[0048]

[0058] As described above, FIG. 3 is provided as an example. Other examples may differ from those described with respect to FIG. 3.

[0049]

[0059] FIG. 4 is a diagram illustrating an example 400 of sidelink communication and access link communication according to various aspects of the present disclosure.

[0050]

[0060] As shown in FIG. 4, the transmitter (Tx) / receiver (Rx) UE 405 and the Rx / Tx UE 410 can communicate with each other via a sidelink, as described above with respect to FIG. 3. Further shown, in some sidelink modes, the base station 110 can communicate with the Tx / Rx UE 405 via a first access link. Additionally or alternatively, in some sidelink modes, the base station 110 can communicate with the Rx / Tx UE 410 via a second access link. The Tx / Rx UE 405 and / or the Rx / Tx UE 410 can correspond to one or more UEs described elsewhere herein, such as the UE 120 of FIG. 1. Thus, a direct link between UEs (e.g., via the PC5 interface) may be referred to as a sidelink, and a direct link between the base station 110 and a UE 120 (e.g., via the Uu interface) may be referred to as an access link. Sidelink communication can be transmitted via a sidelink, and access link communication can be transmitted via an access link. Access link communication can be either downlink communication (from the base station 110 to the UE 120) or uplink communication (from the UE 120 to the base station 110).

[0051]

[0061] As noted above, FIG. 4 is provided as an example. Other examples may differ from those described with respect to FIG. 4.

[0052]

[0062] FIG. 5 is a diagram showing an example 500 of delay-constrained deployment according to various aspects of the present disclosure. In some aspects, the delay-constrained deployment shown in FIG. 5 can be an Industrial Internet of Things (IIoT) deployment, or another suitable deployment in which packets are transmitted and received with delay constraints, reliability constraints, etc. As shown in FIG. 5, the delay-constrained deployment can include a management system 505, one or more human-machine interfaces (HMIs) 510, one or more programmable logic controller (PLC) UEs 515, and one or more sensor / actuator (S / A) UEs 520.

[0053]

[0063] The management system 505 may include a computer, such as, among other possibilities / examples, an industrial personal computer or a network controller 130. The management system 505 may perform, among other possibilities / examples, controller programming, software and security management, or long-term key performance indicator (KPI) monitoring. In some aspects, the management system 505 may perform one or more of the operations described herein as being performed by the network controller 130.

[0054]

[0064] The HMI 510 may include a user device, such as a tablet computer, a laptop computer, a wearable device (e.g., a smart watch or smart glasses, etc.), a mobile phone, a virtual reality device, an augmented reality device, etc. The HMI 510 may be used to control one or more machines (e.g., the S / A UE 520) at the factory floor level. In some aspects, the HMI 510 may be capable of changing the operating mode of the S / A UE 520.

[0055]

[0065] The PLC UE515 may include a processor (e.g., a central processing unit (CPU), a graphics processing unit (GPU), an accelerated processing unit (APU), a microprocessor, a microcontroller, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or another type of processing component). The PLC UE515 may communicate with the base station 110 on the access link using uplink / downlink communication, or may be associated with the base station 110 that communicates with one or more S / A UEs 520 on the access link using uplink / downlink communication. In some aspects, the PLC UE515 may communicate with one or more S / A UEs 520 using sidelink communication. In some aspects, the PLC UE515 may issue commands and receive sensor inputs from the S / A UE520 in real-time or near real-time. In some aspects, the PLC UE515 and the management system 505 may be associated with a backhaul, such as a wireless or wireline backhaul.

[0056]

[0066] The S / A UE520 may include a sensor, an actuator, or another type of IIoT device. For example, the S / A UE520 may be a sensor or an actuator, such as, among other possibilities, a rotary motor, a linear servo, or a position sensor. In some aspects, the S / A UE520 may include, be included in, or be associated with (such that the S / A UE520 communicates with the UE120 using sidelink communication) the UE120. In some aspects, the S / A UE520 may be associated with a wireless interface for communicating with a given PLC UE515 there through. The wireless interface may be scheduled by the base station 110 associated with the PLC UE515 and / or configured based at least in part on configuration information provided by the management system 505.

[0057]

[0067] In some aspects, the wireless interface can carry data communication between the S / A UE 520 (or related UE 120) and the base station 110, such as, among other possibilities / examples, data communication carrying status update reports related to the S / A UE 520 or data communication carrying sensor measurements related to the S / A UE 520. Additionally, the wireless interface can carry HARQ feedback related to data communication between the S / A UE 520 (or related UE 120) and the base station 110, PLC UE 515, etc. For example, in some aspects, the HARQ feedback can include an ACK related to data communication to indicate that the S / A UE 520 has successfully received and decoded the data communication, and / or a NACK related to data communication to indicate that the S / A UE 520 has not been able to receive or successfully decode the data communication.

[0058]

[0068] As described above, FIG. 5 is provided as an example. Other examples may differ from those described with respect to FIG. 5.

[0059]

[0069] FIGS. 6A - 6B are diagrams showing an example 600 of ultra - reliable low - latency communication (URLLC) according to various aspects of the present disclosure. For example, as described herein, a wireless network (e.g., wireless network 100) can provide a URLLC service to support use cases where the base station 110 and the UE 120 need to communicate via an access link using low - latency requirements and / or high - reliability requirements, generally referred to herein as URLLC requirements. In URLLC, for example, the base station 110 and the UE 120 communicate packets with a small payload size (e.g., smaller than or equal to, such as 32 bytes, 256 bytes, etc.) for a target reliability metric (e.g., 10 -6or better block error rate (BLER), reliability of 99.999% or better, etc.) and target latency (e.g., end-to-end latency of 1 millisecond or less). Thus, URLLC services may be required to meet URLLC requirements that, in particular, may include public safety, remote diagnosis / surgery, emergency response, autonomous driving, smart energy and grid management, and factory automation, and support use cases with strict reliability and latency requirements. To do so, they may be provided on an access link (e.g., Uu interface) in a wireless network such as a 5G or NR network.

[0060]

[0070] For example, as shown in FIG. 6A and by reference numeral 610, an IIoT (or factory automation) deployment may meet the URLLC latency target. As shown, sensors in an IIoT deployment may send communications to an embedded computing node, which may forward the communications to a transmitter associated with the IIoT deployment. The transmitter may send the communications to a receiver associated with the wireless network (e.g., a receiver associated with base station 110), and the receiver may route the communications to a control / steering server for processing. After the control / steering server processes the communications, response communications may be provided from the control / steering server to a transmitter associated with the wireless network (e.g., a transmitter associated with base station 110), and the transmitter may send the response communications to a receiver associated with the IIoT deployment.

[0061]

[0071] The receiver can then route the communication to the embedded computing nodes, and the embedded computing nodes can forward the response communication to the actuator, which can perform an action based at least in part on the response communication. Thus, to meet the URLLC latency target of low end-to-end latency (e.g., less than 1 millisecond), the user interface (e.g., the embedded computing nodes and the transmitter / receiver associated with the IIoT deployment) may need to have a low one-way latency (e.g., less than 0.3 millisecond), and the wireless interface (e.g., between the transmitter / receiver associated with the IIoT deployment and the receiver / transmitter associated with the wireless network) may need to have a low one-way latency (e.g., less than 0.2 millisecond).

[0062]

[0072] To meet the stringent reliability and latency requirements associated with URLLC services, the wireless interface (e.g., the access link or the Uu interface) can be designed to efficiently allocate resources to support communication between the base station and the UE. For example, as shown in FIG. 6B and by reference numeral 620, the URLLC service can be enabled by mini-slot resource allocation to perform actions such as reducing the transmission time, enabling multiple switching points within a slot, and enabling fast switching (e.g., from downlink to uplink or vice versa). For example, in a wireless network that supports scalable numerology, a shorter transmission time can generally be achieved with a larger subcarrier spacing.

[0063]

[0073] Therefore, mini-slot resource allocation can define a scheduling unit smaller than a typical slot that enables URLCC transmissions to be scheduled quickly to meet stringent latency requirements. For example, in FIG. 6B, one standard scheduling slot is divided into four mini-slots including two mini-slots for downlink communication and two mini-slots for uplink communication. Further, mini-slot resource allocation can enable URLLC transmissions to preempt other transmissions to immediately transmit data that requires low latency. For example, when resources are not available for URLLC transmissions, URLLC transmissions can be scheduled on resources that overlap with ongoing transmissions for other service types (e.g., eMBB), and the preempted transmissions can be handled by HARQ feedback, preemption indication, etc.

[0064]

[0074] Further, as indicated by reference numeral 620, the URLLC service can be supported by using SPS for initial transmissions, which enables radio resources to be semi-statically configured and allocated to the UE for a time period longer than one subframe, which can avoid the need for specific downlink allocation messages and / or uplink grant messages via the PDCCH for each subframe. To configure SPS, radio resource control (RRC) signaling can indicate the interval at which radio resources are periodically allocated.

[0065]

[0075] PDCCH signaling may indicate specific transmission resource allocations in the time / frequency domain and transmission attributes (e.g., periodicity, MCS, time offset, transmission power, etc.). Further, the URLLC service may enable uplink data transmission that can be performed without dynamic grants, generally referred to as configured grants (CG). More specifically, in a type 1 CG configuration, the UE can perform uplink data transmission without a grant, based at least in part on an RRC (re)configuration without layer 1 (L1) signaling, and in a type 2 CG configuration, the UE can perform uplink data transmission without a grant, based at least in part on an RRC (re)configuration combined with L1 signaling (e.g., downlink control information) to activate and / or release the type 2 CG configuration.

[0066]

[0076] Further, as indicated by reference numeral 640, the wireless network may support the URLLC service by using PDCCH-scheduled retransmissions triggered by negative acknowledgments (NACK). For example, instead of performing blind retransmissions that may reduce network capacity, retransmissions may be triggered only when the transmitter receives a NACK for the initial transmission. For example, on the downlink, the base station may perform an initial SPS-based downlink transmission in a first downlink mini-slot that includes an uplink control portion where the UE transmits HARQ feedback to indicate whether the initial downlink transmission was successfully received. In response, a second downlink mini-slot may follow, where the base station may transmit a PDCCH to schedule a retransmission for the UE indicating a NACK for the initial downlink transmission.

[0067]

[0077] Similarly, on the uplink, the UE may perform an initial uplink transmission (e.g., using a configured grant) in a first uplink mini-slot that includes an uplink common burst portion in which the UE can receive HARQ feedback indicating whether the initial uplink transmission was successfully received from the base station. Accordingly, after the first uplink mini-slot, a second uplink mini-slot may follow in which the base station may transmit a PDCCH to dynamically schedule a retransmission of the initial uplink transmission. In this way, by performing retransmission only when triggered by a NACK, radio resource efficiency is improved.

[0068]

[0078] URLLC services can be supported on the access link or Uu interface using, for example, mini-slot resource allocation, initial downlink and / or uplink transmissions without dynamic grants (e.g., using SPS or CG), NACK-triggered retransmissions, etc. However, there are various scenarios where access link communication may be unavailable or restricted and / or sidelink communication may be more efficient than access link communication. For example, in an IIoT deployment, access link communication may be unavailable in an environment with insufficient network coverage or no network coverage (e.g., a shielded production cell). In such an example, sidelink communication can be used to enable cooperative operations between robots or other industrial machines in a factory floor. Sidelink communication can also be used to offload network traffic (e.g., by using the sidelink for maintenance between a maintenance device such as a tablet and an on-demand sensor without interrupting URLLC-based closed-loop control).

[0069]

[0079] However, sidelink communication is typically not designed to meet the stringent reliability and latency requirements associated with URLLC use cases. For example, sidelink communication is often designed with a focus on V2X use cases related to peer-to-peer communication and enabling proper operation when the UE is outside the coverage area of the cellular network. For example, in sidelink transmission modes (e.g., mode 2) where resource selection and / or scheduling is performed by the UE to support sidelink operation in the absence of the cellular network, distributed resource allocation typically relies on autonomous sensing for distributed channel access, which causes significant overhead to enable sensing. Thus, sidelink communication often has relaxed service quality (QoS) requirements with respect to the low latency (e.g., 1 millisecond) required especially for factory automation and other URLLC use cases, so that the sidelink or PC5 interface generally has much lower radio efficiency for carrying traffic compared to the access link or Uu interface. As a result, existing techniques for enabling sidelink communication between UEs lack the efficiency to support URLLC traffic.

[0070]

[0080] Some aspects described in this specification relate to techniques and apparatus for supporting URLLC traffic over sidelink. For example, some aspects described in this specification may enable an initial transmission to be performed using a CG (or similar) configuration to reduce control overhead, support NACK trigger retransmissions to improve radio efficiency, etc. related to a sidelink control information (SCI) configuration. Additionally or alternatively, some aspects described in this specification may utilize mini-slot based resource allocation to reduce transmission time, provide multiple switching points within a slot, and enable fast switching (e.g., between transmission directions) within a slot. In this way, some aspects described in this specification may enable compliance with the stringent URLLC latency and reliability requirements for sidelink communication in latency-constrained deployments such as IIoT deployments.

[0071]

[0081] As noted above, FIGS. 6A-6B are provided as an example. Other examples may differ from those described with respect to FIGS. 6A-6B.

[0072]

[0082] FIG. 7 is a diagram illustrating an example 700 of an IIoT deployment that supports URLLC via sidelink according to various aspects of the present disclosure. As shown in FIG. 7, example 700 includes a base station 110 that can communicate with one or more PLC UEs 712 and one or more S / A UEs 714 via an access link or Uu interface that can provide a low-rate control channel (e.g., when the IIoT deployment is provided in a shielded production cell or another environment with poor or no network coverage). Thus, the IIoT deployment may rely on sidelink communication for various operations due to the unavailability or limited availability of the access link or Uu interface. For example, as illustrated, the IIoT deployment includes an on-demand sensor 716 that can communicate with a maintenance device 718 using a sidelink or PC5 interface that can provide an on-demand high-rate data channel (e.g., to offload traffic from the access link). Further, in some aspects, each PLC UE 712 can communicate with one or more S / A UEs 714 via a URLLC sidelink (e.g., in a star topology coordinated by the base station 110, a star topology coordinated between different PLC UEs 712, a star topology coordinated by the maintenance device 718, etc.). As described herein, the URLLC sidelink can provide a strong radio frequency channel that can be used for high data rate and control in a manner that can meet stringent reliability and latency requirements.

[0073]

[0083] For example, as described above, the URLLC service can perform an initial transmission without the need for dynamic permission to reduce control overhead (e.g., using SPS configuration for initial downlink transmission or CG configuration for initial uplink transmission), perform only NACK-triggered retransmissions to improve radio efficiency, reduce transmission time, and provide mini-slot resource allocation to provide multiple switching points within a slot, etc. It can be supported on the access link or Uu interface by various techniques. Therefore, some of the aspects described herein can popularize one or more techniques used to support the URLLC service on the access link or Uu interface to the URLLC sidelink provided on the PC5 interface between the PLC UE 712 and the S / A UE 714. For example, as described herein, the URLLC sidelink can be implemented using an SCI configuration that allows the PC5 interface to meet high-reliability and low-latency requirements while maintaining backward compatibility with existing sidelink communication techniques.

[0074]

[0084] For example, existing sidelink communication techniques are generally related to a physical (PHY) layer configuration and / or a lower media access control (MAC) layer configuration that uses two-stage SCI to indicate various parameters for controlling sidelink transmission. In particular, the stage 1 SCI carried via the PSCCH is generally used to indicate channel usage or resource reservation, and the stage 1 SCI is blindly decoded by all UEs. The stage 1 SCI may also include a pointer to a stage two SCI carried via the PSSCH to indicate additional parameters such as a transmitter identifier, a receiver identifier, an MCS, and HARQ control information related to a transport block transmitted via the PSSCH. Further, the transmitting UE may send an SCI even for a configured grant PSSCH that can be transmitted without a dynamic grant. In some aspects, as will be described in more detail with reference to FIGS. 8A-8C and FIGS. 9A-9D, the URLLC sidelink implemented on the PC5 interface between the PLC UE 712 and the S / A UE 714 may be at least partially based on a two-stage SCI in which the transmitting UE may broadcast or multicast the stage 1 SCI to one or more receiving UE and / or send a stage 2 SCI to further indicate UE-specific information.

[0075]

[0085] Furthermore, unicast sidelink communication (e.g., between one transmitting UE and one receiving UE) can be established through the upper layer MAC and higher protocols (e.g., sidelink or PC5 radio resource control (RRC) signaling). Using the upper layer MAC and higher protocols to establish unicast communication on the sidelink can significantly simplify the design for the physical layer and / or the lower MAC layer for V2X use cases that may have relaxed QoS requirements regarding latency, etc. However, this technique presents challenges regarding configuring prompt interaction between the physical layer and the lower MAC layer for two UEs communicating via a unicast sidelink connection. Thus, some aspects described herein may utilize configured grants (e.g., receiver-directed configured grants) to support a statically or semi-statically configured interaction between the physical layer and the lower MAC layer for UEs communicating via a unicast sidelink connection. Additionally, some aspects described herein may provide an SCI configuration that enables sidelink communication, including initial transmissions from the PLC UE712 to one or more S / A UEs714, retransmissions from the PLC UE712 to one or more S / A UEs714, initial transmissions from one or more S / A UEs714 to the PLC UE712, retransmissions from one or more S / A UEs714 to the PLC UE712, etc., to meet strict QoS requirements (e.g., reliability and / or latency requirements).

[0076]

[0086] As described above, FIG. 7 is provided as an example. Other examples may differ from those described with respect to FIG. 7.

[0077]

[0087] Figures 8A-8C are diagrams showing one or more examples 800 related to URLLC via sidelink according to various aspects of the present disclosure. As shown in Figures 8A-8C, the example(s) 800 include a transmitter UE and one or more receiver UEs that communicate via a sidelink (or PC5 interface) (e.g., according to a one-to-one or one-to-many configuration). In some aspects, in an IIoT deployment, a latency-constrained deployment, or another suitable deployment where UE-to-UE sidelink communication via a radio interface is related to strict QoS requirements (e.g., high reliability, low latency, etc.), the transmitter UE may correspond to a PLC UE (e.g., PLC UE 515, PLC UE 712, etc.), and the receiver UE may correspond to an S / A UE (e.g., S / A UE 520, S / A UE 714, etc.). As described herein, the example(s) 800 relate to various techniques for enabling a transmitter UE to perform an initial transmission and / or retransmission to one or more receiver UEs in a manner that can meet strict QoS requirements related to UE-to-UE sidelink communication.

[0078]

[0088] In some aspects, the transmitter UE and the receiver UE may communicate in one or more latency-constrained time cycles where the slots used for sidelink communication include one or more transmission time intervals configured as mini-slots (e.g., in a manner similar to that shown in Figure 6B). In this case, the mini-slot configuration may include a first scheduling unit (e.g., the first slot) in which the transmitter UE can transmit a PSCCH and / or an initial PSSCH transmission, and further, the receiver UE can transmit a PSFCH indicating HARQ feedback for the initial PSSCH transmission. Further, as described herein, the mini-slot configuration may include a second scheduling unit (e.g., the second slot) in which the transmitter UE can transmit additional PSCCHs and / or retransmit the PSSCH for one or more receiver UEs indicating NACK for the initial PSSCH transmission.

[0079]

[0089] As shown in FIG. 8A and by reference numeral 810, a transmitter UE may transmit, to one or more receiver UEs, a PSCCH including a stage 1 sidelink control information message 812 (shown in FIG. 8A as SCI-1), together with a PSSCH including respective configured grant data 814 (e.g., using controller / processor 280, transmission processor 264, TX MIMO processor 266, MOD254, antenna 252, transmission component 1106, etc.). For example, in some aspects, the stage 1 SCI message 812 may indicate respective resource reservations that the transmitter UE should use to transmit the configured grant data 814 to one or more receiver UEs. In other words, the resource reservations indicated in the stage 1 SCI message 812 may indicate a set of subchannels that the transmitter UE occupies in one or more transmission time intervals (e.g., slots, minislots, or other scheduling units) to transmit the configured grant data 814 to one or more receiver UEs. For example, in FIG. 8A, the transmitter UE may transmit a PSSCH including respective configured grant data 814 to five receiver UEs (shown as S / A1 to S / A5). Thus, each receiver UE may have a receiver-directed configured grant configuration that enables each receiver UE to receive sidelink data transmission in a particular transmission time interval without the need for a dynamic grant for scheduling sidelink data transmission. For example, in some aspects, the receiver-directed configured grant may be configured by a base station via access link (Uu) RRC signaling, by a transmitter UE via sidelink (PC5) RRC signaling, etc.

[0080]

[0090] Therefore, the stage 1 SCI message 812 can be a common (or group common) stage 1 SCI message transmitted by the transmitter UE to occupy all of the time and frequency resources to be used for one or more PSSCH transmissions to one or more respective receiver UEs. Further, the stage 1 SCI message 812 can indicate one or more transmission parameters (e.g., MCS, HARQ control information, channel usage or reservation information, etc.) for all of the receiver UEs. In this way, the stage 1 SCI message 812 can be backward compatible with existing SCI configurations and enable dynamic resource coordination between different transmitter UEs (e.g., different PLC UEs, on-demand sensors, etc.) by indicating the time and frequency resources occupied by the transmitter UE. Further, in some aspects, the stage 1 SCI message 812 can be used as an input to a heartbeat detection algorithm used to maintain respective unicast connections from the transmitter UE to each receiver UE.

[0081]

[0091] In some aspects, the stage 1 SCI message 812, in combination with the respective configured grant(s) used to transmit the PSSCH to the receiving UE(s), may specify all parameters and related information related to the transmission of the configured grant data 814 via the PSSCH. Thus, in some aspects, the transmitting UE may refrain from transmitting a stage 2 SCI message that would otherwise be used in legacy sidelink communication to indicate UE-specific transmission parameters since all relevant information is specified in the stage 1 SCI message 812 and the respective configured grant (even if the PSSCH is transmitted using a configured grant that does not require a dynamic grant). Additionally or alternatively, the transmitting UE may transmit an additional SCI message to one or more of the receiving UEs to override one or more transmission parameters indicated in the common stage 1 SCI message 812. For example, in some aspects, the transmitting UE may transmit an additional UE-specific stage 1 SCI message to one or more of the receiving UEs, and the UE-specific stage 1 SCI message may point to the stage 2 SCI message. Thus, the transmitting UE may transmit a stage 2 SCI message to one or more receiving UEs to indicate one or more parameters that override transmission parameters, such as the modulation and coding scheme (MCS) configuration, indicated in the common stage 1 SCI message 812 that is applicable to all of the receiving UEs.

[0082]

[0092] Thus, as described herein, the transmitting UE may transmit one stage 1 SCI message 812 to occupy a set of resources reserved for the transmitting UE to transmit PSSCH to one or more receiving UEs. For example, in the case of multiple receiving UEs, the PSSCH may include different transport blocks for each receiving UE. Thus, each receiving UE may attempt to decode the PSSCH transmitted to each respective receiving UE, and each respective receiving UE may transmit a PSFCH 816 indicating an acknowledgment (ACK) if the PSSCH was successfully received and decoded, or a NACK if the receiving UE was unable to successfully receive and / or decode the PSSCH. In this way, the transmitting UE may perform retransmissions for one or more receiving UEs indicating NACK for the initial PSSCH transmission, as described below with respect to FIG. 8C.

[0083]

[0093] As shown in FIG. 8B and by reference numeral 820, the transmitting UE may alternatively transmit a stage 1 SCI message 822 (e.g., using controller / processor 280, transmitting processor 264, TX MIMO processor 266, MOD 254, antenna 252, transmission component 1106, etc.) that points to a stage 2 SCI message 824 indicating whether configured grant data (e.g., PSSCH) exists for each respective receiving UE. For example, in some cases, the resources to be used for sidelink transmission to one or more receiving UEs may be unavailable, or the traffic targeted at one or more receiving UEs may be unavailable, in which case the transmitting UE may refrain from transmitting PSSCH to such (one or more) receiving UEs. In this case, the stage 2 SCI message 824 may include one or more presence indicators, or presence indication information, to indicate whether the PSSCH carrying the configured grant data exists on the reserved resources indicated in the stage 1 SCI message 822.

[0084]

[0094] Thus, in some aspects, one or more receiving UEs may perform non-blind detection on the stage 2 SCI message 824 (e.g., when the stage 1 SCI message 822 indicates that resources are occupied for the corresponding receiving UE) to determine whether the PSSCH carrying the configured grant data is present on the reserved resources associated with each receiving UE. For example, the stage 2 SCI message 824 may include a bitmap that provides a presence indicator for a set of receiving UEs. For example, as shown in FIG. 8B, the transmitter UE transmits the PSSCH to four receiving UEs (shown as S / A1 to S / A4) and does not transmit the PSSCH to a fifth receiving UE (shown as S / A5). Thus, in this example, the bitmap may include five bits set to "11110" to indicate that the PSSCH is present for the first four receiving UEs and not present for the fifth receiving UE.

[0085]

[0095] Therefore, when the transmitter UE transmits the stage 1 SCI message 822 that points to the stage 2 SCI message 824 carrying the PSSCH presence information for one or more receiver UEs, the receiver UE may transmit the PSFCH 826 to indicate ACK / NACK feedback only when the stage 2 SCI message 824 indicates the presence of PSSCH for each respective receiver UE. Further, in some aspects, the PSSCH presence information carried in the stage 2 SCI message 824 may be used to enable multi-path diversity (e.g., fast point selection) in the case of multiple data paths from the transmitter UE to each respective receiver UE (e.g., by encoding the PSSCH presence information to select one of the multiple data paths). Additionally or alternatively, the PSSCH presence information carried in the stage 2 SCI message 824 may be used to enable variable-rate control for one or more receiver UEs. For example, in some cases, the URLLC service may limit the payload size to 32 bytes with 1 millisecond latency, but in some cases, the sidelink between the transmitter UE and the receiver UE may be able to transmit a larger payload size and still meet the latency constraint. Therefore, in some aspects, the PSSCH presence information may be used to encode or otherwise indicate the data rate to be used for sidelink transmission from the transmitter UE to the receiver UE to enable variable-rate control.

[0086]

[0096] As shown in FIG. 8C and by reference numeral 830, the transmitter UE may receive ACK / NACK feedback from one or more receiver UEs via the PSFCH (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, receive component 1102, etc.). For example, the transmitter UE may perform an initial PSSCH transmission to one or more receiver UEs as described above with respect to FIGS. 8A and / or 8B. Thus, the transmitter UE may receive ACK / NACK feedback from each receiver UE that was the intended recipient of the initial PSSCH transmission (e.g., as indicated in a stage 1 and / or stage 2 SCI message).

[0087]

[0097] As further shown in FIG. 8C and by reference numeral 832, the transmitter UE may transmit a stage 1 SCI message 834 and a stage 2 group SCI message 836 (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, transmit component 1106, etc.) to schedule a PSSCH retransmission to each receiver UE indicating a NACK for the initial PSSCH transmission. For example, in some aspects, the stage 1 SCI message 834 may indicate the total resource allocation to be used for the retransmission in the slot (e.g., the set of subchannels reserved or otherwise occupied by the transmitter UE for the retransmission). Further, the stage 1 SCI message 834 may point to a stage 2 group SCI message 836 that may include detailed permissions for the retransmission to each receiver UE indicating a NACK for the initial PSSCH transmission.

[0088]

[0098] For example, in FIG. 8C, three receivers UE (shown as S / A1 to S / A3) may indicate NACK for the initial PSSCH transmission, whereby the stage 1 SCI message 834 may indicate the total resource usage in the slot to be used for retransmission to the three receiver UEs. Further, the stage 2 SCI message 836 may include three dynamic grants for scheduling retransmissions to each of the three receiver UEs. For example, each dynamic grant carried in the stage 2 SCI message 836 may indicate one or more subchannels to be used for retransmission to the respective receiver UE. Further, in some aspects, the stage 2 SCI message 836 may include a single CRC and / or subchannel-based message structure to reduce overhead (e.g., with respect to including a separate cyclic redundancy check (CRC) for each dynamic grant and / or indicating each dynamic grant in a separate stage 2 SCI message). Thus, as further shown by reference numeral 838, the receiver UE that indicated NACK for the initial transmission may transmit a PSFCH to provide ACK / NACK feedback for the PSSCH retransmission.

[0089]

[0099] As described above, FIGS. 8A-8C are provided as examples. Other examples may differ from those described with respect to FIGS. 8A-8C.

[0090]

[0100] Figures 9A - 9D are diagrams showing one or more examples 900 related to URLLC via sidelink according to various aspects of the present disclosure. As shown in Figures 9A - 9D, the example(s) 900 include one or more transmitter UEs that communicate with a receiver UE via a sidelink (or PC5 interface) (e.g., according to a 1 - to - 1 or many - to - 1 configuration). In some aspects, in an IIoT deployment, a latency - constrained deployment, or another suitable deployment where UE - to - UE sidelink communication via a wireless interface is related to strict QoS requirements (e.g., high reliability, low latency, etc.), the transmitter UE may correspond to an S / A UE (e.g., S / A UE 520, S / A UE 714, etc.), and the receiver UE may correspond to a PLC UE (e.g., PLC UE 515, PLC UE 712, etc.). As described herein, the example(s) 900 relate to various techniques to enable the (one or more) transmitter UEs to perform initial transmission and / or re - transmission to the receiver UE in a manner that can meet the strict QoS requirements related to UE - to - UE sidelink communication.

[0091]

[0101] In some aspects, the transmitter UE and the receiver UE may communicate in one or more latency-constrained time cycles in which the slots used for sidelink communication include one or more transmission time intervals configured as mini-slots (e.g., in a similar manner as shown in FIG. 6B). In this case, the mini-slot configuration may include a first scheduling unit (e.g., a first slot) in which the (one or more) transmitter UEs may transmit PSCCH and / or initial PSSCH transmissions, and further, the receiver UE may transmit a PSFCH, an enhanced PSFCH (ePSFCH), or a further enhanced PSFCH (fePSFCH) indicating HARQ feedback for the initial PSSCH transmission. Further, as described herein, the mini-slot configuration may include a second scheduling unit (e.g., a second slot) in which the (one or more) transmitter UEs may transmit additional PSCCHs and / or the receiver UE may retransmit the PSSCH when indicating NACK for one or more of the initial PSSCH transmissions by the one or more transmitter UEs.

[0092]

[0102] As shown in FIG. 9A and by reference number 910, one or more transmitter UEs may each transmit a stage 1 SCI message 912 (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, transmit component 1106, etc.) via one or more subchannels occupied by each respective transmitter UE when using a configured grant to perform an initial transmission to a receiver UE. For example, in FIG. 9A, three transmitter UEs may transmit a PSCCH carrying the stage 1 SCI message 912, and the three transmitter UEs may further transmit a PSSCH via one or more occupied subchannels. For example, a first transmitter UE (S / A1) that occupies a first subchannel to transmit a first PSSCH to a receiver UE may transmit a first stage 1 SCI message 912 via the first subchannel. In the same example, a second transmitter UE (S / A2) that occupies a second subchannel to transmit a second PSSCH to the receiver UE may transmit a second stage 1 SCI message 912 via the second subchannel. In the same example, a third transmitter UE (S / A3) that occupies a plurality of subchannels may transmit a third PSSCH to the receiver UE and may transmit a third stage 1 SCI message 912 via the plurality of occupied subchannels. Further, as described herein, each transmitter UE may have a configured grant (e.g., configured by a base station via access link or Uu RRC signaling, configured by a receiver UE via sidelink or PC5 RRC signaling, etc.) used to transmit its respective PSSCH via (one or more) occupied subchannels without a dynamic grant.

[0093]

[0103] In some aspects, the stage 1 SCI message 912 transmitted by each transmitter UE may indicate the radio resources (e.g., time and frequency resources) occupied by each transmitter UE, which may enable backward compatibility with existing sidelink communication techniques that use two-stage SCI. Further, in a manner similar to that described above with respect to FIGS. 8A-8C, the stage 1 SCI message 912 may be used for heartbeat detection to maintain each unicast link from each respective transmitter UE to the receiver UE. Further, the stage 1 SCI message 912 and / or the (one or more) configured grants used to transmit the PSSCH to the receiver UE may specify all parameters related to PSSCH transmission, whereby the transmitter UE may refrain from transmitting a stage 2 SCI message that would otherwise be used in legacy sidelink communication to indicate UE-specific transmission parameters. Additionally or alternatively, the transmitter UE may transmit additional SCI to one or more of the receiver UEs to override one or more transmission parameters. For example, in some aspects, one or more transmitter UEs may transmit an additional UE-specific stage 1 SCI message that points to a stage 2 SCI message that overrides transmission parameters, such as the MCS configuration, indicated in the stage 1 SCI message 912.

[0094]

[0104] As shown in FIG. 9B and by reference numeral 920, one or more transmitter UEs can each receive ACK / NACK feedback from a receiver UE via the PSFCH (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, receive component 1102, etc.). For example, the (one or more) transmitter UEs can perform an initial PSSCH transmission to the receiver UE as described above with respect to FIG. 9A. Thus, each of the (one or more) transmitter UEs can receive from the receiver UE ACK / NACK feedback indicating whether the receiver UE has successfully received and decoded, or been unable to successfully receive and / or decode, the initial PSSCH transmission from each respective transmitter UE.

[0095]

[0105] As further shown in FIG. 9B and by reference numeral 922, one or more transmitter UEs may perform multi-user MIMO (MU-MIMO) retransmissions of an initial PSSCH transmission (e.g., using controller / processor 280, transmission processor 264, TX MIMO processor 266, MOD 254, antenna 252, transmission component 1106, etc.) using a configured grant resource shared among all of the transmitter UEs. For example, as shown, stage 1 SCI message 924 may indicate sidelink resource 926 in the time and frequency regions to be shared among the transmitter UEs performing the retransmission, and the transmitter UEs may be configured through a configured grant to share sidelink resource 926 (e.g., without dynamic grant). In some aspects, when multiple transmitter UEs are performing retransmissions using shared sidelink resource 926, each respective transmitter UE may be configured with orthogonal (or near-orthogonal) demodulation reference signal (DMRS) ports and / or sequences for MU-MIMO retransmission. Further, in some aspects, the initial PSSCH transmission by one or more transmitter UEs may be related to a target reliability metric (e.g., block error rate (BLER)) selected to ensure that the shared sidelink resource 926 used for MU-MIMO retransmission is not overloaded by some of the transmitter UEs performing the MU-MIMO retransmission. For example, the target BLER may be 10 -2 10 -3 etc. may be set.

[0096]

[0106] Therefore, as shown in FIG. 9B, the (one or more) transmitter UEs that receive NACKs from the receiver UE for the initial PSSCH transmissions may transmit the stage 1 SCI message 924 and the corresponding PSSCH retransmissions together via the shared sidelink resource 926 (e.g., radio resources). Further, the shared sidelink resource 926 may be related to the configured grant to enable the (one or more) transmitter UEs to perform MU-MIMO retransmissions without dynamic grants. In some aspects, the transmitter UEs that perform MU-MIMO retransmissions may be further configured to use respective power offsets that are at least partially based on some other transmitter UEs that are triggered to perform retransmissions based on NACKs from the receiver UE. For example, in some aspects, each power offset used by the (one or more) transmitter UEs may be proportional to the total amount of radio resources related to the configured grant used for the (one or more) initial PSSCH transmissions.

[0097]

[0107] Alternatively, as shown in FIG. 9C and by reference numeral 930, one or more transmitter UEs may each receive ACK / NACK feedback via an enhanced PSFCH (ePSFCH) 932 transmitted by a receiver UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, receive component 1102, etc.). In this case, as shown by reference numeral 934, the top m transmitter UEs that receive NACK feedback from the receiver UE may perform PSSCH retransmission using group-configured grants in a retransmission slot (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, transmit component 1106, etc.). For example, the parameter m may indicate the maximum number of transmitter UEs that are allowed to perform PSSCH retransmission using group-configured grants, and the parameter m may have a value configured by RRC signaling (e.g., access link (or Uu) RRC signaling, sidelink (or PC5) RRC signaling, etc.).

[0098]

[0108] Additionally or alternatively, the value of parameter m may be indicated in downlink control information, or other suitable signaling that activates group-configured grants. For example, as shown by reference numeral 936, FIG. 9C shows a case where m is set to 2, such that a maximum of two transmitter UEs that receive NACK feedback from the receiver UE are allowed to retransmit the PSSCH using group-configured grant resources. For example, as shown, each of the top m transmitter UEs performing retransmission may receive an equal share of the group-configured grant resources (e.g., if m is set to 2, 1 / 2 of the frequency resources may be allocated to each retransmitting UE).

[0099]

[0109] In some aspects, the group-configured grant may include a priority list or other priority indication for each respective transmitter UE that can be used to determine the top m transmitter UEs, and the priority for each respective transmitter UE may vary over time according to a time update rule specified by RRC or other suitable signaling (e.g., to ensure that the group-configured grant resources are shared fairly among all transmitter UEs). Thus, in some aspects, each transmitter UE may need to decode the HARQ feedback carried in the ePSFCH932 for all other transmitter UEs sharing the same group-configured grant, in order to determine the number of transmitter UEs that receive a NACK from the receiver UE, and to determine the respective priority associated with each transmitter UE that receives a NACK from the receiver UE. In this way, each transmitter UE that receives a NACK may be able to self-determine whether each respective transmitter UE is among the top m transmitter UEs that are enabled to perform PSSCH retransmission in the retransmission slot.

[0100]

[0110] Alternatively, as shown in FIG. 9D and by reference numeral 940, one or more transmitter UEs may each receive ACK / NACK feedback (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, receive component 1102, etc.) via a further enhanced PSFCH (fePSFCH) 942 transmitted by the receiver UE. In this case, in addition to carrying ACK / NACK feedback for the (one or more) initial PSCCH transmissions from the (one or more) transmitter UEs, the fePSFCH 942 may include one or more dynamic grants for one or more retransmissions (e.g., corresponding to an initial PSSCH transmission related to NACK feedback). Thus, as shown by reference numeral 944, one or more transmitter UEs that receive NACK feedback from the receiver UE and also receive a dynamic grant for retransmission may perform a PSSCH retransmission in a retransmission slot using a group-configured grant (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, transmit component 1106, etc.).

[0101]

[0111] For example, as shown by reference numeral 946, the fePSFCH 942 received from the receiver UE may also provide dynamic grants that may be encoded separately or together in the fePSFCH 942 and include NACKs for initial PSSCH transmissions from the second and third transmitter UEs (shown as S / A2 and S / A3). Thus, each transmitter UE that receives NACK feedback from the receiver UE may further determine whether the fePSFCH 932 includes a dynamic grant for that respective transmitter UE, in which case the transmitter UE may retransmit the PSSCH in a retransmission slot.

[0102]

[0112] Additionally or alternatively, in some aspects, the retransmission techniques shown in FIGS. 9C and 9D can be used in combination to provide additional flexibility when scheduling sidelink retransmissions, enable a larger sidelink retransmission capacity, reduce the overhead associated with the dynamic grants used for sidelink retransmissions, etc. For example, to combine the retransmission techniques shown in FIGS. 9C and 9D, each using a priority list and a dynamic grant to determine which (one or more) transmitter UEs should perform a retransmission, the receiver UE may indicate that the radio resources associated with the group-configured grant to be used for (one or more) PSSCH retransmissions should be partitioned into two parts. The two parts may include a first part to support retransmissions by the top m transmitter UEs that receive NACK feedback, and a second part to support retransmissions by the transmitter UEs that receive a dynamic grant for PSSCH retransmissions. In some aspects, the first part and the second part of the radio resources associated with the group-configured grant may be equal, or the first part and the second part may not be equal (e.g., to enable additional flexibility, increase the capacity for one group of retransmitting UEs, reduce the dynamic grant overhead, etc.).

[0103]

[0113] Thus, each retransmission candidate (e.g., a transmitter UE that receives a NACK feedback) may determine whether the PSFCH (or ePSFCH or fePSFCH) includes a dynamic permission for PSSCH retransmission. A retransmission candidate that receives a dynamic permission may use a share of a second portion of the radio resources allocated to support retransmission by a transmitter UE that receives the dynamic permission for PSSCH retransmission, and each such transmitter UE may exclude itself from competing for the other portions of the radio resources allocated to support retransmission by the top m transmitter UEs that receive a NACK feedback. Thus, among the remaining retransmission candidates (e.g., a transmitter UE that receives a NACK feedback but does not receive a dynamic permission for PSSCH retransmission), the top m retransmission candidates may perform PSSCH retransmission using a portion of the radio resources allocated to support retransmission by the top m transmitter UEs in a manner similar to that described above with reference to FIG. 9C.

[0104]

[0114] As described above, FIGS. 9A-9D are provided as examples. Other examples may differ from those described with respect to FIGS. 9A-9D.

[0105]

[0115] FIG. 10 is a diagram illustrating an exemplary process 1000, according to various aspects of the present disclosure, performed, for example, by a transmitter UE. The exemplary process 1000 is an example of operations related to URLLC via a sidelink performed by a transmitter UE (e.g., UE120, UE305, UE405, UE410, PLC UE515, PLC UE712, etc.).

[0106]

[0116] As shown in FIG. 10, in some aspects, process 1000 may include transmitting a stage 1 SCI message to a plurality of receiving UEs, where the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiving UEs (block 1010). For example, the transmitting UE may transmit a stage 1 SCI message to the plurality of receiving UEs (e.g., using controller / processor 280, transmitting processor 264, TX MIMO processor 266, MOD 254, antenna 252, memory 282, etc.) as described above. In some aspects, the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiving UEs.

[0107]

[0117] As further shown in FIG. 10, in some aspects, process 1000 may include transmitting a PSSCH to a subset of the plurality of receiving UEs, at least in part based on a configured grant associated with the subset of the plurality of receiving UEs and respective resource reservations indicated in the stage 1 SCI message (block 1020). For example, the transmitting UE may transmit a PSSCH to a subset of the plurality of receiving UEs (e.g., using controller / processor 280, transmitting processor 264, TX MIMO processor 266, MOD 254, antenna 252, memory 282, etc.) at least in part based on a configured grant associated with the subset of the plurality of receiving UEs and respective resource reservations indicated in the stage 1 SCI message as described above.

[0108]

[0118] Process 1000 may include additional aspects such as any single aspect or any combination of aspects related to one or more other processes described below and / or elsewhere in this specification.

[0109]

[0119] In a first aspect, each resource reservation indicated in the stage 1 SCI message indicates a plurality of subchannels occupied by a transmitter UE in one or more transmission time intervals. In a second aspect, alone or in combination with the first aspect, the stage 1 SCI message includes a heartbeat signal for maintaining a unicast link from the transmitter UE to a plurality of receiver UEs. In a third aspect, alone or in combination with one or more of the first and second aspects, configured grants related to a subset of a plurality of receiver UEs are configured by a base station using access link RRC signaling or a transmitter UE using sidelink RRC signaling.

[0110]

[0120] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the stage 1 SCI message is a common stage 1 SCI message indicating an MCS configuration for a plurality of receiver UEs, and process 1000 includes transmitting a UE-specific stage 1 SCI message to one or more of the plurality of receiver UEs, where the UE-specific stage 1 SCI message points to a stage 2 SCI message, and transmitting a stage 2 SCI message to one or more of the plurality of receiver UEs, where the stage 2 SCI message includes one or more parameters for overriding the MCS configuration indicated in the common stage 1 SCI message for the plurality of receiver UEs.

[0111]

[0121] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the stage 1 SCI message includes a pointer to a stage 2 SCI message indicating whether a PSSCH exists for each of a plurality of receiving UE. In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the stage 2 SCI message includes a bitmap for indicating whether a PSSCH exists for each of a plurality of receiving UE. In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the process 1000 receives, via the PSFCH, feedback from a subset of a plurality of receiving UE for which the stage 2 SCI message indicates that a PSSCH exists, where the feedback received from each receiving UE indicates whether each respective receiving UE has successfully received the PSSCH. In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the stage 2 SCI message indicates whether a PSSCH exists for each of a plurality of receiving UE according to a presence flag used for multipath diversity or variable rate control for each respective receiving UE.

[0112]

[0122] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the process 1000 determines one or more of a plurality of receiver UEs that were unable to successfully receive the PSSCH, based at least in part on the feedback received via the PSFCH, and transmits an additional stage 1 SCI message including a pointer to a stage 2 group SCI message to the one or more receiver UEs that were unable to successfully receive the PSSCH, where the additional stage 1 SCI message and the stage 2 group SCI message schedule a retransmission of the PSSCH for the one or more receiver UEs that were unable to successfully receive the PSSCH. In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the additional stage 1 SCI message indicates the total resource usage for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH. In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the stage 2 group SCI message includes information related to each sidelink grant for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH. In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the stage 2 group SCI message includes a single cyclic redundancy check.

[0113]

[0123] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the transmitter UE is a PLC UE and the plurality of receiver UEs are S / A UEs.

[0114]

[0124] FIG. 10 shows exemplary blocks of process 1000, but in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or blocks configured differently compared to those shown in FIG. 10. Additionally or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

[0115]

[0125] FIG. 11 is a block diagram of an exemplary apparatus 1100 for wireless communication according to various aspects of the present disclosure. Apparatus 1100 may be a transmitter UE or the transmitter UE may include apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102, a communication manager 1104, and a transmitting component 1106 that may communicate with each other (e.g., via one or more buses). As shown, apparatus 1100 may communicate with another apparatus 1108 (e.g., a receiver UE, a base station, or another wireless communication device) using receiving component 1102 and transmitting component 1106.

[0116]

[0126] In some aspects, apparatus 1100 may be configured to perform one or more operations described herein with respect to FIGS. 7, 8A - 8C, and / or 9A - 9D. Additionally or alternatively, apparatus 1100 may be configured to perform one or more processes described herein, such as process 1000 of FIG. 10. In some aspects, apparatus 1100 may include one or more components of UE 120 described above with respect to FIG. 2.

[0117]

[0127] The receiving component 1102 may receive communications such as a reference signal, control information, data communication, or a combination thereof from the device 1108. The receiving component 1102 may provide the received communication to one or more other components of the device 1100, such as the communication manager 1104. In some aspects, the receiving component 1102 may perform signal processing on the received communication (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, decoding, etc.) and may provide the processed signal to one or more other components. In some aspects, the receiving component 1102 may include one or more antennas, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or combinations thereof of the UE 120 described above with respect to FIG. 2.

[0118]

[0128] The transmitting component 1106 may transmit communications such as a reference signal, control information, data communication, or a combination thereof to the device 1108. In some aspects, the communication manager 1104 may generate a communication and may transmit the generated communication to the transmitting component 1106 for transmission to the device 1108. In some aspects, the transmitting component 1106 may perform signal processing on the generated communication (e.g., filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, encoding, etc.) and may transmit the processed signal to the device 1108. In some aspects, the transmitting component 1106 may include one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the UE 120 described above with respect to FIG. 2. In some aspects, the transmitting component 1106 may be collocated with the receiving component 1102 in a transceiver.

[0119]

[0129] The communication manager 1104 may transmit the stage 1 SCI message to a plurality of receiving UEs or cause it to be transmitted to the transmission component 1106. For example, in some aspects, the stage 1 SCI message may indicate respective resource reservations for a plurality of sidelink transmissions to the device 1108 and / or other devices. The communication manager 1104 may transmit the PSSCH to the device 1108 and / or other devices or cause it to be transmitted to the transmission component 1106, based at least in part on the configured grant associated with the device 1108 and / or other devices and each resource reservation indicated in the stage 1 SCI message. In some aspects, the communication manager 1104 may include the controller / processor, memory, or a combination thereof of the UE 120 described above with respect to FIG. 2.

[0120]

[0130] In some aspects, the communication manager 1104 may include a set of components, such as the instruction component 1110. Alternatively, the set of components may be separate and distinct from the communication manager 1104. In some aspects, one or more components of the set of components may include or may be implemented within the controller / processor, memory, or a combination thereof of the UE 120 described above with respect to FIG. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be stored on a non-transitory computer-readable medium and implemented as instructions or code executable by a controller or processor to perform the functions or operations of the component.

[0121]

[0131] The indication component 1110 may configure a stage 1 SCI message to indicate respective resource reservations for a plurality of sidelink transmissions to a plurality of receiver UEs. The transmission component 1106 may transmit the stage 1 SCI message to the plurality of receiver UEs, and the transmission component 1106 may further transmit a PSSCH to a subset of the plurality of receiver UEs, at least partially based on a configured grant associated with the subset of the plurality of receiver UEs and each resource reservation indicated in the stage 1 SCI message.

[0122]

[0132] The number and arrangement of the components shown in FIG. 11 are provided as an example. In practice, there may be additional components, fewer components, different components, or components arranged differently compared to those shown in FIG. 11. Further, two or more of the components shown in FIG. 11 may be implemented within a single component, or a single component shown in FIG. 11 may be implemented as a plurality of distributed components. Additionally or alternatively, a set of (one or more) components shown in FIG. 11 may perform one or more functions described as being performed by another set of components shown in FIG. 11.

[0123]

[0133] The foregoing disclosure provides illustration and description, and is neither comprehensive nor limiting to the exact forms disclosed. Modifications and variations may be made in light of the foregoing disclosure or obtained from practice of the aspects.

[0124]

[0134] As used herein, the term "component" is to be broadly construed as hardware, firmware, and / or a combination of hardware and software. The processor used herein is implemented in hardware, firmware, and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or combinations of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods does not limit the aspects. Thus, the operation and behavior of the systems and / or methods are described herein independent of specific software code, and it should be understood that the software and hardware can be designed to implement the systems and / or methods at least in part based on the description herein.

[0125]

[0135] Meeting a threshold value as used herein can, depending on the context, mean that the value is greater than the threshold value, greater than or equal to the threshold value, less than the threshold value, less than or equal to the threshold value, equal to the threshold value, not equal to the threshold value, etc.

[0126]

[0136] Certain combinations of features are recited in the claims and / or disclosed herein, but these combinations are not intended to limit the disclosure in its various aspects. In fact, many of these features may be combined in ways that are not specifically recited in the claims and / or disclosed herein. Each dependent claim described below may depend directly on only one claim, but the disclosure in its various aspects includes each dependent claim in combination with any other claim in the claims. A phrase that refers to "at least one of" a list of items refers to any combination of those items, including a single member. As an example, "at least one of a, b, or c" includes a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination having multiple 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 order of a, b, and c).

[0127]

[0137] No element, act, or instruction used in this specification should be construed as important or essential unless explicitly described as such. Also, the articles "a" and "an" used in this specification include one or more items and can be used interchangeably with "one or more". Further, the article "the" used in this specification includes one or more items referred to with respect to the article "the" and can be used interchangeably with "one or more". Additionally, the terms "set" and "group" used in this specification include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and can be used interchangeably with "one or more". If only one item is intended, the phrase "only one" or a similar expression is used. Also, the terms "has", "have", "having", etc. used in this specification shall be open-ended terms. Furthermore, the phrase "based on" means "at least partially based on" unless otherwise specified. Also, the term "or" used in this specification is inclusive when used consecutively and can be used interchangeably with "and / or" unless otherwise specified (e.g., when used in combination with "either" or "only one of"). The invention described in the claims of the present application at the time of filing is appended below. [C1] A method of wireless communication performed by a transmitter user equipment (UE), comprising: transmitting a stage 1 sidelink control information (SCI) message to a plurality of receiver UEs, wherein the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs; transmitting a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiver UEs, at least partially based on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the stage 1 SCI message; A method comprising the steps of: [C2] The method according to C1, wherein the respective resource reservations indicated in the stage 1 SCI message indicate a plurality of subchannels occupied by the transmitter UE in one or more transmission time intervals. [C3] The method according to C1, wherein the stage 1 SCI message includes a heartbeat signal for maintaining a unicast link from the transmitter UE to the plurality of receiver UEs. [C4] The method according to C1, wherein the configured grant associated with the subset of the plurality of receiver UEs is configured by a base station using access link radio resource control (RRC) signaling or the transmitter UE using sidelink RRC signaling. [C5] The stage 1 SCI message is a common stage 1 SCI message indicating a modulation and coding scheme configuration for the plurality of receiver UEs, and wherein the method comprises: transmitting a UE-specific stage 1 SCI message to one or more of the plurality of receiver UEs, wherein the UE-specific stage 1 SCI message points to a stage 2 SCI message. Transmitting the stage 2 SCI message to the one or more of the plurality of receiving UEs, wherein the stage 2 SCI message includes one or more parameters for overriding the modulation and coding scheme configuration indicated in the common stage 1 SCI message for the plurality of receiving UEs. The method according to C1, further comprising. [C6] The method according to C1, wherein the stage 1 SCI message includes a pointer to a stage 2 SCI message indicating whether the PSSCH exists for each of the plurality of receiving UEs. [C7] The method according to C6, wherein the stage 2 SCI message includes a bitmap for indicating whether the PSSCH exists for each of the plurality of receiving UEs. [C8] Receiving feedback from a subset of the plurality of receiving UEs for which the stage 2 SCI message indicates the existence of the PSSCH via a physical sidelink feedback channel (PSFCH), wherein the feedback received from each receiving UE indicates whether the respective receiving UE has successfully received the PSSCH. The method according to C6, further comprising. [C9] The method according to C6, wherein the stage 2 SCI message indicates whether the PSSCH exists for each of the plurality of receiving UEs according to a presence flag used for multipath diversity or variable rate control for each respective receiving UE. [C10] Determining one or more of the plurality of receiving UEs that were unable to successfully receive the PSSCH based at least in part on feedback received via a physical sidelink feedback channel (PSFCH); Transmitting an additional stage 1 SCI message including a pointer to a stage 2 group SCI message to the one or more receiving UEs that were unable to successfully receive the PSSCH, wherein the additional stage 1 SCI message and the stage 2 group SCI message schedule a retransmission of the PSSCH for the one or more receiving UEs that were unable to successfully receive the PSSCH. The method according to C1, further comprising. [C11] The method according to C10, wherein a total resource usage amount for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH for the additional stage 1 SCI message is indicated. [C12] The method according to C10, wherein the stage 2 group SCI message includes information related to respective sidelink grants for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH. [C13] The method according to C10, wherein the stage 2 group SCI message includes a single cyclic redundancy check. [C14] The method according to C1, wherein the transmitter UE is a programmable logic controller UE and the plurality of receiver UEs are sensor / actuator UEs. [C15] A transmitter user equipment (UE) for wireless communication, comprising a memory, one or more processors operably coupled to the memory, and wherein the memory and the one or more processors are configured to transmit stage 1 sidelink control information (SCI) messages to a plurality of receiver UEs, wherein the stage 1 SCI messages indicate respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, transmit a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiver UEs, at least in part based on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the stage 1 SCI messages, a transmitter user equipment (UE). [C16] The transmitter UE according to C15, wherein the respective resource reservations indicated in the stage 1 SCI messages indicate a plurality of subchannels occupied by the transmitter UE in one or more transmission time intervals. [C17] The transmitter UE according to C15, wherein the stage 1 SCI message includes a heartbeat signal for maintaining a unicast link from the transmitter UE to the plurality of receiver UEs. [C18] The transmitter UE according to C15, wherein the configured grant related to the subset of the plurality of receiver UEs is configured by a base station using access link radio resource control (RRC) signaling or the transmitter UE using sidelink RRC signaling. [C19] The stage 1 SCI message is a common stage 1 SCI message indicating a modulation and coding scheme configuration for the plurality of receiver UEs, wherein the one or more processors transmit a UE-specific stage 1 SCI message to one or more of the plurality of receiver UEs, wherein the UE-specific stage 1 SCI message points to a stage 2 SCI message, transmit the stage 2 SCI message to the one or more of the plurality of receiver UEs, wherein the stage 2 SCI message includes one or more parameters for overriding the modulation and coding scheme configuration indicated in the common stage 1 SCI message for the plurality of receiver UEs, The transmitter UE according to C15, further configured to perform the above. [C20] The transmitter UE according to C15, wherein the stage 1 SCI message includes a pointer to a stage 2 SCI message indicating whether the PSSCH exists for each of the plurality of receiver UEs. [C21] The transmitter UE according to C20, wherein the stage 2 SCI message includes a bitmap for indicating whether the PSSCH exists for each of the plurality of receiver UEs. [C22] The one or more processors receive feedback from a subset of the plurality of receiver UEs for which the stage 2 SCI message indicates the existence of the PSSCH via a physical sidelink feedback channel (PSFCH), wherein the feedback received from each receiver UE indicates whether the respective receiver UE has successfully received the PSSCH, The transmitter UE according to C20, further configured to perform the above. [C23] The transmitter UE according to C20, wherein the stage 2 SCI message indicates whether the PSSCH exists for each of the plurality of receiver UEs according to a presence flag used for multipath diversity or variable rate control for each respective receiver UE. [C24] The one or more processors determine one or more of the plurality of receiver UEs that were unable to successfully receive the PSSCH, at least in part based on feedback received via a physical sidelink feedback channel (PSFCH); transmit an additional stage 1 SCI message to the one or more receiver UEs that were unable to successfully receive the PSSCH, the additional stage 1 SCI message including a pointer to a stage 2 group SCI message, wherein the additional stage 1 SCI message and the stage 2 group SCI message schedule a retransmission of the PSSCH for the one or more receiver UEs that were unable to successfully receive the PSSCH; The transmitter UE according to C15, further configured to perform the above. [C25] The transmitter UE according to C24, wherein the additional stage 1 SCI message indicates the total resource usage for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH. [C26] The transmitter UE according to C24, wherein the stage 2 group SCI message includes information related to respective sidelink grants for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH. [C27] The transmitter UE according to C24, wherein the stage 2 group SCI message includes a single cyclic redundancy check. [C28] The transmitter UE according to C15, wherein the transmitter UE is a programmable logic controller UE and the plurality of receiver UEs are sensor / actuator UEs. [C29] A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions when executed by one or more processors of a transmitter user equipment (UE), cause the one or more processors to Transmitting a stage 1 sidelink control information (SCI) message to a plurality of receiving user equipments (UEs), wherein the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiving UEs Causing a subset of the plurality of receiving UEs to transmit a physical sidelink shared channel (PSSCH) based at least in part on a configured grant associated with the subset of the plurality of receiving UEs and the respective resource reservations indicated in the stage 1 SCI message A non-transitory computer-readable medium that causes the above [C30] An apparatus for wireless communication, comprising means for transmitting a stage 1 sidelink control information (SCI) message to a plurality of receiving user equipments (UEs), wherein the stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiving UEs means for causing a subset of the plurality of receiving UEs to transmit a physical sidelink shared channel (PSSCH) based at least in part on a configured grant associated with the subset of the plurality of receiving UEs and the respective resource reservations indicated in the stage 1 SCI message An apparatus comprising the above

Claims

1. A method of wireless communication performed by a transmitter user equipment (UE), comprising: transmitting a common stage 1 sidelink control information (SCI) message to a plurality of receiver UEs, wherein the common stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and the common stage 1 SCI message is transmitted to occupy all of the time and frequency resources to be used by the transmitter UE to transmit a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiver UEs; transmitting the PSSCH to the subset of the plurality of receiver UEs based at least in part on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the common stage 1 SCI message; A method comprising the steps above.

2. The method according to claim 1, wherein the respective resource reservations indicated in the common stage 1 SCI message indicate a plurality of subchannels occupied by the transmitter UE in one or more transmission time intervals.

3. The method according to claim 1, wherein the common stage 1 SCI message includes a heartbeat signal for maintaining a unicast link from the transmitter UE to the plurality of receiver UEs.

4. The method according to claim 1, wherein the configured grant associated with the subset of the plurality of receiver UEs is configured by a base station using access link radio resource control (RRC) signaling or by the transmitter UE using sidelink RRC signaling.

5. The common stage 1 SCI message indicates a modulation and coding scheme configuration for the plurality of receiver UEs, and the method further comprises: transmitting a UE-specific stage 1 SCI message to one or more of the plurality of receiver UEs, wherein the UE-specific stage 1 SCI message points to a stage 2 SCI message. Transmitting the stage 2 SCI message to the one or more of the plurality of receiving UEs, wherein the stage 2 SCI message includes one or more parameters for overriding the modulation and coding scheme configuration indicated in the common stage 1 SCI message for the plurality of receiving UEs. The method according to claim 1, further comprising.

6. The method according to claim 1, wherein the common stage 1 SCI message includes a pointer to a stage 2 SCI message indicating whether the PSSCH exists for each of the plurality of receiving UEs.

7. The method according to claim 6, wherein the stage 2 SCI message includes a bitmap for indicating whether the PSSCH exists for each of the plurality of receiving UEs.

8. Receiving feedback from the subset of the plurality of receiving UEs via a physical sidelink feedback channel (PSFCH), wherein the stage 2 SCI message indicates the existence of the PSSCH for the subset of the plurality of receiving UEs, and the feedback received from each receiving UE indicates whether the respective receiving UE has successfully received the PSSCH. The method according to claim 6, further comprising.

9. The method according to claim 6, wherein the stage 2 SCI message indicates whether the PSSCH exists for each of the plurality of receiving UEs according to a presence flag used for multipath diversity or variable rate control for each respective receiving UE.

10. Determining one or more of the plurality of receiving UEs that were unable to successfully receive the PSSCH, at least partially based on the feedback received via the physical sidelink feedback channel (PSFCH); Transmitting an additional stage 1 SCI message including a pointer to a stage 2 group SCI message to the one or more receiving UEs that were unable to successfully receive the PSSCH, wherein the additional stage 1 SCI message and the stage 2 group SCI message schedule a retransmission of the PSSCH for the one or more receiving UEs that were unable to successfully receive the PSSCH. The method according to claim 1, further comprising

11. The method according to claim 10, wherein the additional stage 1 SCI message indicates a total resource usage for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH.

12. The method according to claim 10, wherein the stage 2 group SCI message includes information related to each sidelink grant for the retransmission scheduled for the one or more receiver UEs that were unable to successfully receive the PSSCH.

13. The method according to claim 1, wherein the transmitter UE is a programmable logic controller UE and the plurality of receiver UEs are sensor / actuator UEs.

14. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions, when executed by one or more processors of a transmitter user equipment (UE), cause the one or more processors to transmit a common stage 1 sidelink control information (SCI) message to a plurality of receiver UEs, wherein the common stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and the common stage 1 SCI message is transmitted to occupy all of the time and frequency resources to be used by the transmitter UE to transmit a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiver UEs, cause the subset of the plurality of receiver UEs to transmit the PSSCH based at least in part on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the common stage 1 SCI message A non-transitory computer-readable medium comprising one or more instructions to cause the above.

15. An apparatus for wireless communication, Means for transmitting a common stage 1 sidelink control information (SCI) message to a plurality of receiver user equipment (UE), wherein the common stage 1 SCI message indicates respective resource reservations for a plurality of sidelink transmissions to the plurality of receiver UEs, and the common stage 1 SCI message is transmitted to occupy all of the time and frequency resources to be used by a transmitter UE to transmit a physical sidelink shared channel (PSSCH) to a subset of the plurality of receiver UEs. An apparatus comprising means for transmitting the PSSCH to a subset of the plurality of receiver UEs, based at least in part on a configured grant associated with the subset of the plurality of receiver UEs and the respective resource reservations indicated in the common stage 1 SCI message.

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