Abstract: Wireless communications systems and methods related to communicating control information are provided. A method of wireless communication performed by a user equipment (UE) may include performing a clear channel assessment (CCA), transmitting, to a first UE based on the CCA being successful, a first transport block (TB) via a first sub-PSSCH associated with a first sub-slot, and transmitting, to at least one of the first UE or a second UE, a second TB via a PSSCH associated with a slot.

Abstract: Wireless communications systems and methods related to communicating information are provided. A method of wireless communication performed by a user equipment (UE) may include mapping a sub-physical sidelink shared channel (sub-PSSCH), sidelink control information (SCI), and an automatic gain control (AGC) symbol to a sub-slot of a plurality of sub-slots of a slot and transmitting, to at least one other UE, a transport block via the sub-PSSCH of the sub-slot.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may transmit, to a second UE, a grant-only indicator to indicate that a second stage sidelink control information (SCI-2) is decoupled from physical sidelink shared channel (PSSCH) data in a slot, and that the SCI-2 indicates an SCI-2-only grant. The first UE may transmit, to the second UE in the slot, the SCI-2-only grant multiplexed with data-only traffic in a first PSSCH transmission based at least in part on the grant-only indicator, wherein the SCI-2-only grant indicates a resource allocation for a subsequent slot. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may receive an indication of a first set of parameters that corresponds to a direct communication link between an industrial internet-of-things (IIoT) device and a first controller; receive an indication of a second set of parameters that corresponds to an indirect communication link between the IIoT device and the first controller through a second controller; and schedule a communication on at least one of the direct communication link or the indirect communication link based at least in part on the first set of parameters and the second set of parameters. Numerous other aspects are provided.

Abstract: Apparatus, methods, and computer-readable media for facilitating support for an increased quantity of sidelink configured grants are disclosed herein. An example method for wireless communication at a user equipment (UE) includes receiving scheduling information corresponding to a first quantity of sidelink configured grants, the first quantity of sidelink configured grants being greater than eight sidelink configured grants. The example method also includes receiving, from a base station, an activation of a sidelink configured grant of the first quantity of sidelink configured grants. The example method also includes transmitting sidelink traffic to a second UE based on the sidelink configured grant.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration that indicates multiple time intervals corresponding to multiple physical sidelink shared channels (PSSCHs) within a slot, wherein at least one PSSCH, of the multiple PSSCHs, starts in a symbol other than an initial data symbol of the slot. The UE may communicate in one or more PSSCHs, of the multiple PSSCHs, within the slot based at least in part on the configuration. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a device may measure a set of reference signal receive power (RSRP) metrics for reference signals including one or more reference signals from a base station and one or more reference signals from a controller associated with the device; and determine, based at least in part on the RSRP metrics, a configuration for receiving communications from the controller via a direct communication link with the controller or via the base station. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for wireless communications at a device are described. The device may receive an indication of a configuration that schedules semi-persistently scheduled resources for transmissions from the first device. The device may also receive an indication of a set of resources available to the first device for requesting a set of the semi-persistently scheduled resources configured for the first device. The device may transmit a message over the set of resources to request the set of semi-persistently scheduled resources.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may transmit a first sidelink control information (SCI) message associated with a sidelink transmission from the first UE, the first SCI message including a first indication of a set of resources reserved for retransmissions of the sidelink transmission at one or more retransmission occasions. The first UE may identify a second SCI message associated with the first SCI message, the second SCI message including one or more time domain resource allocation (TDRA) field values indicative of at least a first subset of the set of resources and a release of the at least first subset of the set of resources reserved for the retransmissions of the sidelink transmission, the release pertaining to at least one retransmission occasion of the one or more retransmission occasions. The first UE may then transmit fewer retransmissions of the sidelink transmission in accordance with the release.

Abstract: Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for a first user equipment (UE) to manage the reuse of resources reserved for sidelink communications by the UE. The first UE may identify scheduling information for a sidelink shared channel between the first UE and a second UE, and the first UE may reserve a set of resources for subsequent sidelink communications by the first UE. The first UE may transmit a sidelink control message indicating the scheduling information and the reserved resources to one or more neighboring UEs. The sidelink control message may include a reuse allowance indicator that may indicate whether the set of reserved resources is available for spatial reuse by the neighboring UEs. The neighboring UEs may determine whether the reuse the reserved resources based on the control message, the reuse allowance indicator, or both.

Abstract: Methods, systems, and devices for wireless communications are described. For example, a method for wireless communications at a transmitting user equipment (UE) may include receiving, from a base station, a resource configuration of sidelink communications. The transmitting UE may transmit, to a receiving UE, sidelink control information (SCI) via one or more SCI messages, the SCI comprising one or more semi-persistent scheduling indications pertaining to a semi-persistent scheduling configuration for communications from the transmitting UE to the receiving UE. The transmitting UE may monitor for feedback information pertaining to the SCI prior to proceeding with semi-persistent scheduled sidelink transmissions in accordance with the one or more semi-persistent scheduling indications.

Abstract: Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support the transmission of a scheduling request via a physical sidelink feedback channel (PSFCH). In some cases, a user equipment (UE) may determine a configuration of a set of PSFCH resource blocks (RBs). The UE may receive a first bit map that may indicate a subset of the set of PSFCH RBs allocated for transmitting a scheduling request on the PSFCH, and the UE may receive a second bit map that may indicate a second subset of the PSFCH RBs allocated for hybrid automatic repeat request (HARQ) messages. The UE may transmit a scheduling request via one or more RBs of the first subset of the PSFCH RBs. In some cases, the UE may generate a waveform for transmitting the scheduling request message, and the waveform may be based on the number of RBs selected.

Abstract: This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for CRC scrambling for SCI in sidelink communication. A wireless transmitter may be configured to scramble bits of SCI based on a scrambling sequence and transmit the SCI to a wireless receiver. The wireless receiver may receive the SCI having CRC bits scrambled with the scrambling sequence and attempt to decode the SCI, including descrambling the CRC bits of the SCI. The SCI may include a first portion of SCI transmitted in a PSCCH and a second portion of SCI transmitted in a PSSCH.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from at least one second UE, first control information associated with a first reserved set of resources on a sidelink channel. The first UE may attempt to decode additional control information based at least in part on the first control information. The first UE may transmit, based at least in part on failing to decode the additional control information, a message using the first reserved set of resources. In some aspects, the first UE may determine, based on one or more resource dimensions, at least one first distance between the first UE and the at least one second UE, such that the message is transmitted with a first transmit power based at least in part on the first distance. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for wireless communications are described. A first device, which may be a user equipment (UE), may transmit a sidelink control information SCI) message (e.g., an SCI-1 message) on a physical sidelink control channel (PSCCH) to a group of devices. The SCI may message may reserve a set of sidelink resources for a sidelink communication between the first device and a second device of the group of devices. The first device may receive an acknowledgment (ACK) message on a physical sidelink feedback channel (PSFCH) from the second device. Based on receiving the ACK message, the first device may release the set of sidelink resources and may transmit a release message (e.g., a physical sidelink release channel (PSRCH) message) on a PSRCH that includes an indication of the released set of sidelink resources.

Abstract: The described techniques relate to improved methods, systems, devices, and apparatuses that support spatial reuse for sidelink communications. Generally, the described techniques provide for a user equipment (UE) to reuse resources for receiving sidelink transmissions. The UE may receive a first sidelink control channel that may indicate a set of reserved resources for sidelink communications associated with a second UE. The first UE may decode a second sidelink control channel from the second UE based on the first sidelink control channel. The first UE may determine that the set of resources is available for use based on a result of decoding the second sidelink control channel, a radius of the second sidelink control channel, and the distance between the first UE and the second UE.

Abstract: Aspects of the present disclosure provide techniques for configuring a search space for sidelink communications between one or more sensors/actuators (SAs) and programmable logic controller (PLC) in internet of things (IoT) applications in order to minimize the number of subchannels that a receiver (e.g., PLC or SA) may need to blind decode. More particularly, the search space is configurable based on a hashing function that is based in part on a portion of the resources (e.g., PLC resources) that have been allocated or reserved for sidelink communication within the PLC subnetwork (or PLC group) from the sidelink resource pool available to a plurality of PLCs in a network. By limiting the search space to a subset of resources that are specific to the PLC subnetwork or group, the need for the SA or PLC to perform blind decoding of sidelink control information (SCI) may be further reduced.

Abstract: Aspects of the present disclosure provide techniques that help reducing transmission overhead related to sidelink control information (SCI). For example, when a transmitter UE has established a sidelink communication with a receiver UE, the transmitter UE may schedule with at least one semi-persistent scheduling (SPS) process at a first time interval. The transmitter UE may sense whether a resource is available for transmissions to the receiver UE based on decoding an SCI, such as an SCI 0-1 message. The SCI is transmitted at a second time interval that is greater than the first time interval. For example, the second time interval may be a multiple of the first time interval of the at least one SPS process. The second time interval may be flexible and may be increased to reduce the number of SCI messages transmitted in certain time periods in order to reduce communication overhead.

Abstract: Aspects of the present disclosure provide techniques for configuring a search space for reverse sidelink communications between one or more sensors/actuators (SAs) and programmable logic controller (PLC) in internet of things (IoT) applications. Particularly, the techniques described herein configure a search space (e.g., subset of all available sub-channels) for reception of sidelink packets (e.g., physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH)) that may be received at the PLC from the one or more SAs. In some examples, the PLC may monitor the subset of subchannels and decode the sidelink packets received on the subset of subchannels without the need for the PLC to perform blind decoding of all sidelink sub-channels as is currently required in conventional systems. Thus, the disclosed techniques reduce latency and maximize the resource utilization (e.g., by using less processing power and bandwidth) for sidelink communications.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support physical sidelink shared channel (PSSCH) resource allocation operations. A transmit (TX) user equipment (UE) transmit a physical sidelink control channel (PSCCH) that indicates an allocated PSSCH resource portion. In a first aspect, the portion includes two non-contiguous subchannels. In a second aspect, the PSCCH indicates a layer or a node of a layer of a resource allocation layer structure. In a third aspect, the PSCCH indicates a subchannel group size for an allocated resource, using a bitmask or a value that corresponds to a subchannel and a group size combination. In a fourth aspect, the TX UE determines the portion based multiple values of subchannel and length combinations, the multiple values determined by disabling one or more combinations of a total number of subchannel and length combination for contiguous allocation, or for contiguous and non-contiguous allocation.