Abstract: Methods, systems, and devices for wireless communications are described. Generally, the described techniques allow a channel engineering device (CED) to identify a suitable configuration for deflecting uplink transmissions from a user equipment (UE) to a base station. The base station may transmit control signaling to the CED indicating multiple configurations for deflecting uplink reference signals. The UE may then transmit the uplink reference signals to the CED, and the CED may deflect the uplink reference signals using the indicated configurations. The base station may receive the uplink reference signals from the UE via the CED, and the base station may perform measurements on the uplink reference signals. The base station may then identify a configuration for the CED to use to deflect subsequent transmissions from the UE to the base station based on the measurements, and the base station may transmit an indication of the configuration to the CED.

Abstract: Methods, systems, and devices for wireless communications are described, including a movable relay location variance report. The movable relay location variance report may enable more robust and accurate communications between a control node (e.g., a user equipment (UE) and a base station) and a movable relay (e.g., a drone) equipped with a reconfigurable intelligent surface (RIS). In some aspects, the location variance report may characterize the variance of the drone's location and transmit the information to the UE, the base station, or both. The location variance report may influence the control node beam width, the drone location, and an angle at which the drone may position a RIS. The control node may indicate an adjusted set of parameters to the drone based on receiving the location variance report.

Abstract: Methods, systems, and devices for wireless communications are described. A wireless device may apply phase precompensation to multiple user-multiple input multiple output (MU-MIMO) communications with different wireless devices. The wireless device may measure one or more axis offsets between antenna arrays of the wireless device and other antenna arrays of different wireless devices. The wireless device may perform MU-MIMO communications with the different wireless devices by applying phase precompensation according to the axis offset. For example, the wireless device may transmit or receive communications from multiple wireless devices using the phase precompensation.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a capability message indicating a capability supporting network-side phase noise compensation. The UE may transmit, to the base station, phase tracking reference signals based on transmitting the capability message. In an example, the phase tracking reference signals may include a UE phase noise component which may be associated with a local oscillator of the UE. The UE may receive, from the base station, a compensated downlink transmission that is compensated based on the UE phase noise component. In generating the compensated downlink transmission, the base station may apply a multiplication factor associated with the estimated UE phase noise component to the compensated downlink transmission.

Abstract: Apparatus, methods, and computer-readable media are disclosed herein for facilitating spatial misalignment tracking for OAM beams in millimeter wave and higher frequency bands. An example method for wireless communication at a first communication device includes receiving, from a second communication device, a first misalignment tracking RS and a second misalignment tracking RS for an OAM transmission. The example method also includes determining a misalignment based on the first misalignment tracking RS, the second misalignment tracking RS, and using a subset of antenna elements of an antenna array of the first communication device. Additionally, the example method includes adjusting reception of a subsequent OAM transmission from the second communication device at the antenna array of the first communication device.

Abstract: Apparatus, methods, and computer-readable media for sounding reference signals (SRSs) triggered by random access channel (RACH) message 2 for RACH message 4 physical downlink shared channel quasi co-location (QCL) are disclosed herein. A user equipment (UE) may transmit, to a base station via a transmit beam over a random access channel, a random access preamble and receive a random access response based on the random access preamble. The UE may transmit, to the base station via a plurality of transmit sub-beams, a plurality of SRS transmissions triggered by the random access response. The UE can receive, from the base station, a downlink control signal that includes an SRS resource indicator (SRI) that indicates a selected transmit sub-beam for a corresponding SRS transmission. The UE can use the SRI as QCL information for improved reception of downlink signaling with a refined receive sub-beam corresponding to the selected transmit sub-beam.

Abstract: A configuration to avoid compromised frequencies to enhance frequency resource allocation. The apparatus determines one or more narrowband isolated frequencies from a set of frequencies, wherein the one or more narrowband isolated frequencies have a degraded quality. The apparatus allocates frequency resources based on a determination of the one or more narrowband isolated frequencies from the set of frequencies. The apparatus provides, to a UE, the frequency resources for communication with the base station.

Abstract: Methods, systems, and devices for wireless communications are described. A base station may determine to enable orbital angular momentum (OAM) beamforming for communications with a user equipment (UE), for example, based on one or more communications parameters and receiving a message from the UE indicating a capability of the UE to use OAM beamforming. The base station may transmit control signaling to the UE indicating that OAM beamforming is enabled. In some examples, the base station may transmit control signaling indicating an OAM configuration, which may be for a same slot in which the control signaling is transmitted or a subsequent slot. The base station may transmit a downlink transmission to the UE via OAM beamforming. In some examples, the base station may estimate and correct misalignment associated with OAM beamforming. In some examples, the base station may disable OAM beamforming and transmit an indication that OAM beamforming is disabled.

Abstract: A lens antenna array system is provided that includes a plurality of communication links. The lens antenna array system uses beam index modulation to select an active subset of communication links from the plurality of communication links. The selection of the active subset of the communication links constitutes the transmission of a digital word.

Abstract: Methods, systems, and devices for wireless communications are described, including a movable relay location variance report. The movable relay location variance report may enable more robust and accurate communications between a control node (e.g., a user equipment (UE) and a base station) and a movable relay (e.g., a drone) equipped with a reconfigurable intelligent surface (RIS). In some aspects, the location variance report may characterize the variance of the drone's location and transmit the information to the UE, the base station, or both. The location variance report may influence the control node beam width, the drone location, and an angle at which the drone may position a RIS. The control node may indicate an adjusted set of parameters to the drone based on receiving the location variance report.

Abstract: A synchronization signal block (SSB) transmitted by a neighbor base station may interfere with a physical downlink shared channel (PDSCH) transmitted by a serving base station. A user equipment (UE) that receives both the SSB and PDSCH may mitigate the interference to improve an error rate of decoding the PDSCH. The UE may receive a first SSB including a first broadcast channel (BCH) from a second base station other than a serving base station. The UE may decode the first SSB. The UE may determine, based on the first SSB and the first BCH, that the PDSCH scheduled by the serving base station will overlap with a second SSB from the second base station. The UE may estimate a channel of the second SSB based on the decoded first SSB. The UE may remove a reconstructed second SSB from the PDSCH. The UE may decode the PDSCH.

Abstract: Aspects of disclosure relate to a UE reporting to a gNB time delays and phases of pilot signals received via multiple transmission paths in order for the gNB to pre-equalize a future transmission to the UE. The UE determines a first time delay for receiving a first pilot signal from a gNB via a first path, determines a second time delay for receiving a second pilot signal from the gNB via a second path, and generates a report based on the first time delay and the second time delay. The UE then sends the report to the gNB and receives a multi-TRP signal from the gNB via the first path and the second path, wherein the multi-TRP signal is pre-equalized for transmission based on the report to at least have a same time delay as a shorter one of the first time delay or the second time delay.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a base station, a report that indicates a phase tracking reference signal (PTRS) density for a PTRS. The UE may receive, from the base station via a downlink shared channel, the PTRS in accordance with the PTRS density based at least in part on the report. Numerous other aspects are described.

Abstract: Aspects of the disclosure relate to beam management techniques in a wireless communication system. A UE establishes a communication link with a base station and receives a set of transmit beams transmitted via a plurality of symbols in a sequential manner, wherein a respective transmit beam is transmitted in a respective symbol of the plurality of symbols. The UE measures, for each transmit beam in the set of transmit beams, a set of signal strengths corresponding to the respective transmit beam using a plurality of receive beams in the respective symbol, wherein a respective signal strength is measured based on a respective receive beam. The UE then sends a feedback message to the base station including at least an identification of a transmit beam having a highest measured signal strength among all sets of signal strengths measured for the set of transmit beams and the highest measured signal strength.

Abstract: Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a base station to transmit a feedback configuration to a user equipment (UE) indicating a subcarrier spacing and a length of a cyclic prefix (CP) that the UE is to use to transmit feedback associated with a second frequency band (e.g., a high frequency band) using a first frequency band (e.g., a low frequency band). The UE may monitor the second frequency band for downlink messages transmitted by the base station and transmit a feedback message accordingly using the indicated subcarrier spacing and applying a CP having the indicated length.

Abstract: Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a user equipment (UE) may receive a system information message from a base station indicating a beam sweeping procedure supported by the base station. Based on the system information message, the UE may receive, as part of the indicated beam sweeping procedure, a first synchronization signal block (SSB) as part of first set of SSBs, and a second SSB as part of a second set of SSBs. The UE may then transmit, to the base station, one or more messages that indicate a narrow beam for communications between the UE and the base station. In some cases, the indicated beam may correspond to the first SSB and the second SSB, and is indicated on one or more random access channel (RACH) occasions associated with the beam sweeping procedure.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a communication device may classify a set of packets of streaming video content based at least in part on one or more video characteristics; assign the set of packets to a plurality of transport blocks based at least in part on classifying the set of packets, wherein a first transport block is associated with a first set of values for a set of communication parameters and a second transport block is associated with a second set of values for the set of communication parameters, and wherein the set of communication parameters is associated with a layer mapping technique; and provide the plurality of transport blocks for transmission based at least in part on assigning the set of packets to the plurality of transport blocks. Numerous other aspects are provided.

Abstract: Aspects relate to beam management in multi-stream communication between a radio access network (RAN) entity and a user equipment (UE). The RAN entity may transmit a plurality of transmit beams from a plurality of transmission and reception points (TRPs) associated with the RAN entity to the UE. For each of the transmit beams, the UE may obtain a beam quality metric on each of a plurality of receive beams of the UE during a measurement period (e.g., in parallel or serially) to generate a respective beam quality metric vector for each of the transmit beams. The UE can then transmit a beam report including the respective beam quality metric vector for each of the transmit beams to the RAN entity. The RAN entity may then select at least two beam pair links, each associated with a respective TRP, for spatial division multiplexing of at least two streams to the UE based on the beam report.

Abstract: Methods, systems, and devices for wireless communications are described. In some examples, a control node may receive, from a movable relay node, a capability message indicating a set of operational parameters for the movable relay node. The control node may determine a location for the movable relay node based on the capability message and may transmit, to the movable relay node, a location message indicating the determined location. The movable relay node may change locations or reconfigure one or more relay devices (e.g., reconfigurable intelligent surfaces) of the movable relay node based on the location message. Accordingly, the control node may use the movable relay node to relay messages between the control node and a second node, which may increase the likelihood of successful communications between the control node and the second node.

Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device (e.g., a user equipment (UE) or base station) may reduce a peak to average power ratio (PAPR) by clipping signals transmitted to a receiving device according to a clipping level. The receiving device may receive, from the transmitting device, an indication of the clipping level associated with a reference signal. The receiving device may receive the reference signal and identify distortions based on the clipping level. The receiving device may iteratively reconstruct peaks of the clipped reference signal until the receiving device is able to obtain accurate pilot symbols for use in channel estimation. The techniques described herein may enable receiving devices to improve efficiency and reliability of communications by improving channel estimation, which may increase the probability of successfully decoding transmitted information.