Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive control signaling indicating a plurality of component carriers of a sidelink channel and a plurality of feedback channel configurations for the plurality of component carriers. The UE may select, based at least in part on the plurality of feedback channel configurations, a subset of the plurality of component carriers for transmission of a first sidelink message and a second sidelink message using a feedback channel alignment rule indicating to select component carriers having feedback channels aligned in time for at least a subset of a plurality of transmission time intervals. The UE may transmit the first sidelink message on a first component carrier of the subset and the second sidelink message on a second component carrier of the subset.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, at a first transmission reception point, a first transmission from a second UE associated with communications between the second UE and a third UE. The first UE may receive, at a second transmission reception point, a second transmission. The first UE may identify transmissions having overlapping time-frequency resources based on receiving the first transmission and the second transmission. In some examples, the identified transmissions may include the first transmission and the second transmission. Additionally or alternatively, the identified transmissions may include a third transmission and a fourth transmission. The first UE may transmit an interference mitigation signal to the second UE. The interference mitigation signal may include an indication to orthogonalize one or more reference signals, a negative acknowledgment indication, or both.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain a first indication, based at least in part on a first threshold, that a hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) is caused by a listen-before-talk (LBT) failure. The UE may obtain a second indication, based at least in part on a second threshold, that the HARQ DTX caused by the LBT failure is a type of HARQ DTX that is to be counted for identifying a sidelink radio link failure (RLF). The UE may identify the sidelink RLF based at least in part on detecting a number of consecutive occurrences of the type of HARQ DTX occurrences. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) and multiple network coding devices may communicate to reduce multiple network coding devices accepting a same take over request message from the UE for a given data packet. In some examples, the multiple network coding devices may determine respective backoff periods to wait before accepting the take over request message such that each backoff period is different for each network coding device. In some examples, the UE may receive respective broadcast messages from each of the multiple network coding devices that indicate a network coding capability parameter, and the UE may select a network coding device based on the received capability parameter. In some examples, a network coding device may transmit an indication of packet overload and refrain from accepting a take over request message.

Abstract: Method and apparatus for sidelink assisted interference cancellation. The apparatus receives a set of uplink transmission parameters of a second UE in a neighbor cell. The apparatus performs interference cancellation of an uplink transmission of the second UE on a downlink transmission received from a serving cell. The interference cancellation based at least on the set of uplink transmission parameters of the second UE. The apparatus may provide, to a base station, an indication indicating support for the interference cancellation. The apparatus may indicate, to the base station, a type of interference cancellation operation to be performed by the first UE.

Abstract: Certain aspects of the present disclosure provide techniques for configuring sidelink communications between user equipment's (UEs). Per one technique, during a discovery opportunity, a first UE and a second UE may identify a subset of beam pairs suitable for communication, and schedule a discontinuous transmission (DTX) occasion during the discovery opportunity. During the DTX occasion, the first UE and second UE may perform a beam refinement procedure to determine a beam pair (BP) over which to communicate, from the identified subset of beam pairs. The beam refinement procedure may include beam narrowing of at least one of the identified subset of beam pairs.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select, for a sidelink transmission over an unlicensed band and associated with a medium access control (MAC) protocol data unit (PDU), one or more candidate resources of a set of candidate resources that are within an adaptive effective contention window (ECW). The UE may adjust at least one parameter of the adaptive ECW to determine an adjusted at least one parameter based at least in part on a channel access output associated with the one or more candidate resources. The UE may transmit the MAC PDU using the one or more candidate resources or an additional one or more candidate resources, wherein the additional one or more candidate resources are selected based at least in part on the adjusted at least one parameter. Numerous other aspects are provided.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter user equipment (UE) may transmit, to a receiver UE, a first communication that includes a positioning reference signal (PRS) associated with the transmitter UE. The UE may transmit, to the receiver UE, a second communication that includes an information element associated with a boundary of a vehicle associated with the transmitter UE. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from a second UE, an inter-UE coordination message comprising an indication of a first sidelink resource, of a set of sidelink resources, corresponding to a transmission by the second UE. The UE may transmit a sidelink communication using a second sidelink resource, of a subset of candidate sidelink resources of a set of candidate resources, based at least in part on the indication of the first sidelink resource and a communication relationship between the first UE and the second UE. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, at a second protocol layer of the UE and from a first protocol layer of the UE, the second protocol layer being lower than the first protocol layer, an indication of one or more quality of service parameters associated with a data packet to be transmitted by the UE. The UE may identify, from the one or more quality of service parameters, directional coverage information associated with the data packet, the directional coverage information indicative of one or more transmission directions in which the data packet is to be transmitted. The UE may transmit the data packet in accordance with at least the directional coverage information of the one or more quality of service parameters.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive information identifying a shared channel occupancy for a packet transmission resource and a hop counter value associated with the shared channel occupancy. The user equipment may determine whether to transmit one or more packets in the shared channel occupancy based at least in part on the hop counter value associated with the shared channel occupancy. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for wireless communications are described. A scheduling device may indicate that a transmit power remains constant for a duration of time. A transmitting user equipment (UE) may transmit reference signals on dedicated resources for automatic gain control (AGC) training. As the transmit power from the transmitting UE may remain constant, a receiving UE may determine an AGC configuration for current and subsequent transmissions based on measurements made on the dedicated resources. By using a prior transmission to determine an AGC configuration for a current transmission, a training symbol may not be included in each slot. A symbol formerly used for AGC training in the current transmission may be used to carry sidelink information.

Abstract: Methods, systems, and devices for wireless communications are described. A base station may determine a default operating mode based on the geographic location (e.g., zone) of the base station, for user equipment (UEs) operating in that zone to use. The operating mode may be a full duplex (FD) operating mode or a half duplex (HD) operating mode. A UE operating in the zone may receive, from the base station, an indication of the default operating mode corresponding to the zone, and may select an operating mode based on the indication. The mode selected by the UE may be the same as or different than the indicated default operating mode. For example, the UE may determine to use either FD mode or HD mode based on operation parameters, interference measurements, signaling from a base station or other UEs, one or more measurement thresholds, or some combination thereof.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may generate a first encryption key and a second UE may generate a second encryption key based on a measurement of a channel between the first UE and the second UE. The second UE may transmit, to the first UE, a sidelink message including a one-way digital signature generated using the second encryption key and a message from a defined set of messages. The first UE may generate a set of one-digital signatures using the first encryption key and the defined set of messages and determine whether the one-way digital signature matches one of the set of one-way digital signatures. If there is a match, the first UE and the second UE may communicate using the encryption keys. Otherwise, the first UE and the second UE may generate new encryption keys.

Abstract: Methods, systems, and devices for are described. A user equipment (UE) may transmit, via a first transmission-reception point (TRP), a first sidelink control information (SCI) scheduling a first sidelink transmission from the UE, the first SCI including an indication that a first hybrid automatic repeat request (HARQ) process associated with the first sidelink transmission is enabled. The UE may transmit, via a second TRP different from the first TRP, a second SCI scheduling a second sidelink transmission from the UE, the second SCI including an indication that a second HARQ process associated with the second sidelink transmission is disabled. The UE may transmit the first sidelink transmission and the second sidelink transmission via the first TRP and the second TRP, respectively, based on transmitting the first and second SCI. The UE may monitor, via the first TRP, for a feedback message based on transmitting the first sidelink transmission.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a set of available resources for a sidelink transmission by performing an iterative resource exclusion procedure, wherein performing the iterative resource exclusion procedure comprises determining, for an iteration, a set of potentially available resources that is based at least in part on a primary resource set and an auxiliary resource set, wherein the auxiliary resource set comprises a first resource of a set of sidelink resources in a resource selection window having a corresponding reference signal received power (RSRP) measurement that is less than an RSRP measurement corresponding to a second resource, and wherein the primary resource set includes the second resource. The UE may transmit the sidelink transmission using the set of available resources and at least one transmitter-receiver point of the UE. Numerous other aspects are provided.

Abstract: Wireless communication systems and methods related to sidelink communications are provided. A first user equipment (UE) determines a discontinuous operation configuration that indicates an on-duration period for a sidelink communication and a cycle of discontinuous operation. The first UE communicates with at least one other UE during the on-duration period indicated by the discontinuous operation configuration. The first UE uses a base configuration and an on-duration parameter, an offset parameter, and a cycle parameter to determine a discontinuous operation configuration for the first UE.

Abstract: Techniques for wireless communications are described. A user equipment (UE) may be configured with one or multiple transmission and reception points (TRPs). The UE may support sidelink communications, which may be referred to as vehicle-to-everything (V2X) communications systems, vehicle-to-vehicle (V2V) communications systems, and the like. The UE may provide improvements to resource determination for the sidelink communications by determining whether multiple peer UEs can be space-division multiplexed over time and frequency resources. To mitigate interference between the multiple peer UEs, the UE may transmit a power control request message to one or multiple peer UEs to adjust a transmit power level, and a receive a power control response message from the one or multiple peer UEs accepting or rejecting the transmit power level adjustment. As a result, the UE may experience efficient sidelink operations.

Abstract: Certain aspects of the present disclosure provide techniques for resource allocation with collision indication for sidelink communication. A method that may be performed by a first user equipment (UE) includes receiving a first sidelink transmission from a second UE indicating a first resource reservation; receiving a second sidelink transmission from a third UE indicating a second resource reservation; and transmitting, to at least the second UE, feedback comprising: hybrid automatic retransmission request (HARQ) feedback regarding the first sidelink transmission; and an indication of whether a collision is detected by the first UE between the first resource reservation and the second resource reservation.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, from a second UE a sidelink control information transmission associated with a first transmission configuration indicator (TCI) state over a sidelink channel. The first UE may determine that the sidelink control information transmission reserves time and frequency resources for a sidelink data transmission associated with a second TCI state. In some examples, the second TCI state may be different from the first TCI state. The first UE may then selectively enable or disable a resource protection procedure for the reserved time and frequency resources based on the determination and a signal strength associated with the first TCI state or the second TCI state, a network congestion parameter, or a data priority associated with the sidelink data transmission.