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 via reflection by one or more passive devices, a first reference signal (RS) that is based at least in part on a shared first key that corresponds to a configuration of the one or more passive devices. The first UE may receive, from the second UE via reflection, a second RS that is based at least in part on the first key. The first UE may generate a second key based at least in part on a measurement of the second RS. The first UE may transmit a positioning reference signal that is based at least in part on the second key and that is associated with a measurement of a range between the first UE and the second UE. Numerous other aspects are described.

Abstract: This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for assisted mmW sidelink beam discovery in non-standalone mode. A UE may transmit, to an AN, a request to access one or more ADs. The request may be based on an absence of at least one BPL that has a threshold QoS for a DRB with a second UE. The UE may receive, from the AN based on the transmitted request, an authorization to access the one or more ADs, and exchange, via an SRB, beam training information with the second UE based on the authorization to access the one or more ADs for performing a beam training procedure via the one or more ADs.

Abstract: A user equipment (UE) may communicate with one or more other UEs using multiple transmissions in a device-to-device (D2D) communications deployment. A number of UEs may be configured with D2D resources, and a transmitting UE may identify available D2D resources from the configured resources. The transmitting UE may identify a resource for a first transmission of a D2D transmission from the available D2D resources, and may identify a second resource for a second transmission of the D2D transmission. The second transmission may be a blind HARQ transmission that may be transmitted to enhance the likelihood that one or more receiving UEs successfully receive the transmission. In some examples, the second resource may be identified based on other available resources within an predetermined time window around the first transmission.

Abstract: Various aspects of the disclosure relate to the selection and use of modulation and coding scheme (MCS) values. For example, a first MCS table may be used for a first condition and a second MCS table used for a second condition. The disclosure relates in some aspects to inter-device signaling that indicates which MCS table is to be used for communication between the devices.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a first message identifying a set of UEs comprising one or more other UEs with which the UE is engaging in sidelink communication. The UE may transmit a second message, based at least in part on a determination of a loss of a sidelink connection to a previously-connected UE of the set of UEs, identifying a subset of the set of UEs and indicating the loss of the sidelink connection. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for wireless communication at a first user equipment (UE) are described. A first UE may transmit control signaling to reserve a first set of time and frequency resources for a sidelink transmission. In some examples, the control signaling may indicate one or more parameters to be used by a second UE to identify a second set of time and frequency resources for performing a full-duplex communication with the first UE. In some examples, the first UE may then communicate with the second UE based on the reserved first set of time and frequency resources and the indicated one or more parameters associated with the second set of time and frequency resources.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, from a second UE, sidelink control information for performing full-duplex communications with the second UE. The sidelink control information may include an indication of resources reserved by the second UE, an indication of one or more transmit beam directions associated with the resources reserved by the second UE, or both. The first UE may receive, via the resources reserved by the second UE, a first message using a first receive beam based on the sidelink control information. The first UE may transmit, via the resources reserved by the second UE, a second message using a first transmit beam of the first UE, a direction of the first transmit beam being different from a direction of the first receive beam.

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may support cellular communications (e.g., Uu signaling) in a first frequency range and may support sidelink communications in a second, higher frequency range. To reduce the processing overhead and latency involved in sidelink discovery in the second frequency range, the UE may use Uu signaling in the first frequency range to assist with the sidelink discovery. For example, the UE may determine, based on a configuration, an uplink message supporting UE detection in the first frequency range to support sidelink discovery. The UE may monitor for the uplink message in the first frequency range and may detect a second UE based on the monitoring. The UEs may establish a sidelink connection for sidelink communications in the second frequency range based on the detection of the second UE in the first frequency range.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to one or more other UEs, one or more sidelink reference signal block (S-RSB) bursts in a sidelink beam measurement gap (SBMG) based at least in part on one or more SBMG configurations. The UE may receive, from the one or more other UEs, one or more beam reports or beam measurement reports based at least in part on the one or more S-RSB bursts and the one or more SBMG configurations. Numerous other aspects are described.

Abstract: Aspects of the present disclosure provide synchronization techniques for user equipment (UEs) that may be otherwise unable to support sidelink communication a synchronized UE and may have also lost global navigation satellite system (GNSS) and/or Evolved Node Base Stations (eNBs) as a synchronization source. In such instance, the unsynchronized UE may utilize reference signals (RS) from the data packets received from other UEs to track the timing and perform autonomous timing adjustments based thereon for synchronized packet transmission or reception.

Abstract: A method of wireless communication by a positioning entity includes determining an accuracy of a positioning estimate of a first non-anchor sidelink user equipment (UE). The method also includes determining the accuracy satisfies an accuracy condition. The method further includes configuring the first non-anchor sidelink UE as a first anchor UE based on the positioning estimate satisfying the accuracy condition.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiver user equipment (UE) may receive at least one control communication that includes a first part and a second part. The UE may determine an authenticity status of the at least one control communication based at least in part on at least one of a common security key corresponding to the first part or a private security key corresponding to the second part. The UE may perform a wireless communication task based at least in part on the authenticity status of the at least one control communication. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A first wireless device may receive an indication of one or more parameters for communications over a sidelink channel during a first time period, where the one or more parameters may include a time threshold for a second resource pool. The wireless device may transmit data over a first resource pool of the sidelink channel during a first portion of the first time period based on the one or more parameters, the first resource pool including resources for communications between the first wireless device and a second wireless device. The wireless device may monitor the second resource pool during a second portion of the first time period for the time threshold, the second resource pool including resources for communications between the first wireless device and a third wireless device.

Abstract: Aspects described herein relate to receiving, over a sub-channel of multiple sub-channels, ultra-reliable quality-of-service (QoS) traffic from one or more UEs over a time duration wherein other sub-channels of the multiple sub-channels are used for initial ultra-reliable QoS transmissions from one or more other transmitting UEs over the time duration, and relaying, along with one or more other relaying UEs, the ultra-reliable QoS traffic over a subsequent time duration.

Abstract: Methods, systems, and devices for wireless communications are described in which two or more UEs of a wireless communications system may establish a sidelink connection. A first UE that is initiating sidelink communications may evaluate whether the sidelink connection can support a quality of service (QoS) for a data flow prior to admitting the data flow. The first UE may evaluate a link quality with one or more other UEs that are to use the data flow on the sidelink connection, evaluate system congestion of time/frequency resources that are available for the sidelink connection, or any combinations thereof, and admit the data flow based on the evaluation. A link quality of the sidelink connection may be determined based on a type of communication associated with the data flow, such as unicast communications with one other UE, multicast communications with multiple other UEs, or broadcast transmissions to multiple UEs.

Abstract: Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a first user equipment (UE) to establish a communication link with a base station and a sidelink communication link with a second UE using different transmission reception points associated with the first UE. The first UE may perform an interference measurement between downlink communications received on the communication link and sidelink communications transmitted on the sidelink communication link. The first UE may determine whether it is able to perform full-duplex operations on the communication link and the sidelink communication link based on the interference measurement and may transmit an indication of the capability of the first UE to the base station.

Abstract: Aspects presented herein may enable a first UE to utilize inference results provided by at least a second UE to improve its inference accuracy. In one aspect, a first UE establishes an ML inference result sharing session with one or more second UEs for at least one ML inference task. The first UE receives a first set of ML inference results associated with the at least one ML inference task, where the first set of ML inference results is received from the one or more second UEs during the ML inference result sharing session. The first UE estimates an aggregated ML inference result based on at least one of the first set of ML inference results or a second set of ML inference results, where the second set of ML inference results is configured by the first UE for the at least one ML inference task.

Abstract: Certain aspects of the present disclosure provide a method for wireless communications by a transmitter user equipment (UE). The transmitter UE generates a message authentication code, based on information within a sidelink master information block (SL-MIB) and a key shared between the transmitter UE and a receiver UE. The transmitter UE transmits a sidelink broadcast channel (SL-BCH) transmission carrying the SL-MIB and the message authentication code.

Abstract: Methods, systems, and devices for wireless communications are described. A device may determine a packet for transmission and determine whether to transmit a reservation signal prior to the transmission of the packet based in part on a condition. The condition may include, but is not limited to, a packet size, or a packet priority, or a combination thereof. According to the determination, the device may refrain from transmitting the reservation signal or allocate resources for the reservation signal from a same resource pool associated with the transmission of the packet or a dedicated resource pool according to a pre-reservation resource pattern.

Abstract: In an aspect, a network device (e.g., BS, core network component, etc.) determines a self-interference measurement (SIM) configuration associated with null-forming at a wireless device (e.g., UE or BS), the null-forming associated with steering at least one receive beam of the wireless device and/or at least one transmit beam of the wireless device away from one or more external sources of self-interference. The network device transmits the SIM configuration to the wireless device. The wireless device performs at least one null-forming procedure in accordance with the SIM configuration.