Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive signaling from a base station that schedules the UE to transmit a second uplink signal using a second spatial relationship following transmission of a first uplink signal using a first spatial relationship. The second uplink signal may be scheduled within a beam switching gap associated with switching from the first spatial relationship to the second spatial relationship. In some examples, the UE may transmit the second uplink signal using the first spatial relationship, rather than switching to using the second spatial relationship. In some examples, the UE may shorten the first uplink signal or the second uplink signal (or both) to accommodate the beam switching gap.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive at least one control message including an indication that frequency hopping for downlink control information (DCI) is activated for physical downlink shared channel (PDSCH). The UE may determine a frequency hopping configuration (e.g., a frequency hopping pattern) for the DCI, which may be applied for PDSCH occasions, for a group of PDSCH occasions, or until changed by another indication from the network. The UE may also receive a downlink reference according to the frequency hopping configuration. For example, if intra-occasion frequency hopping is activated, demodulation reference signals (DMRS) may be received in each hop of the DCI within a PDSCH occasion, and if inter-occasion frequency hopping is activated, DMRS may be received once per PDSCH occasion.

Abstract: Methods, systems, and devices for wireless communications at a user equipment (UE) are described. A UE may identify a beam failure for at least one communication beam at the UE. The UE may determine the reasoning for the beam failure and may include the reasoning in a beam failure recovery (BFR) request. The UE may identify a sidelink relay UE to communicate via sidelink channel and transmit the BFR request to the network entity. The network entity may receive the BFR request from the sidelink relay UE and identify beam switching parameters based on the type of interference that caused the beam failure. The network entity may include the beam switching parameters in a BFR response to the UE. The UE may receive the BFR response and switch to another candidate beam to enable communication to the network entity.

Abstract: Methods, systems, and devices for wireless communication are described. In a wireless communication system, a first wireless node may transmit a configuration message indicating one or more spatial configurations for communicating with a second wireless node. A spatial configuration may include one or more different sets of spatial parameters for half-duplex communications and full-duplex communications between the wireless nodes. In some examples, the first wireless node may select a first set of spatial parameters for half-duplex communications or a second set of spatial parameters for full-duplex communications based on an explicit indication or a resource configuration. The wireless nodes may perform half- or full-duplex communications using the first or second set of spatial parameters, respectively, in accordance with the configuration message.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a subband full duplex (SBFD) pattern report, indicating a candidate SBFD pattern. The candidate SBFD pattern may indicate a candidate number of downlink or uplink subbands, a number of or location of guard bands, frequency locations of the uplink or downlink subbands or guard bands, a total uplink and downlink bandwidth, time locations of SBFD symbols or slots, transmit/receive beam pairs, transmission configuration indicator (TCI) state pairs or timing, or any combination thereof. The network may configure the UE with an SBFD pattern based on receiving the SBFD pattern report (e.g., which may or may not be the same as the reported candidate SBFD pattern).

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitting device may add a first extension before modulated symbols of a communication, the first extension including data from an end portion of the modulated symbols. The transmitting device may add a second extension after the modulated symbols, the second extension including data from a beginning portion of the modulated symbols. The transmitting device may apply a first weighting function that overlaps the first extension and the beginning portion of the modulated symbols. The transmitting device may apply a second weighting function that overlaps the end portion of the modulated symbols and the second extension. The transmitting device may add one or more of a header before the first extension or a tail after the second extension. The transmitting device may transmit the communication. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. In a wireless communications system, a user equipment (UE) may receive an indication from a base station that a downlink shared channel resource in a scheduled occasion, such as a semi-persistently scheduled occasion, includes downlink control information (DCI). The UE may monitor the downlink shared channel resource for the DCI based on the indication. The UE may determine a set of uplink control channel resources based on one or more parameters of the DCI and the downlink shared channel resource. The parameters of the DCI on the semi-persistently scheduled downlink shared channel may implicitly indicate the set of uplink control channel resources to the UE. The UE may transmit an uplink control message to the base station using the set of uplink control channel resources.

Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device may generate a first time-domain reference signal sequence of a first sequence length, and may truncate the first sequence length to a second sequence length and may append a header portion and a tail portion to the truncated first time-domain reference signal sequence. The transmitting device may perform a discrete Fourier transform (DFT) on the truncated first time-domain reference signal sequence to generate a frequency-domain reference signal sequence associated with a phase constant, and may perform an inverse fast-Fourier transform (IFFT) on the result of the DFT. The transmitting device may then transmit the result of the IFFT to a receiving device, which may further process the signal by performing a fast-Fourier transform (FFT), dividing by the phase constant, and taking the conjugate of the received sequence.

Abstract: Aspects described herein relate to adding a set of redundant subcarriers to a set of data subcarriers to be transmitted in a unique-word orthogonal frequency division multiplexing (UW-OFDM) waveform, interleaving, based on a permutation matrix, the set of redundant subcarriers with the set of data subcarriers to generate a permutation of subcarriers, mapping the permutation of subcarriers as input to an inverse fast Fourier transform (IFFT), and generating the UW-OFDM waveform based on output of the IFFT. Other aspects relate to receiving and processing the UW-OFDM waveform.

Abstract: Aspects of the disclosure relate to aperiodic transmission of one or more instances of at least one synchronization signal to a user equipment (UE). For example, the base station may allocate a plurality of time resources for aperiodic transmission of one or more instances of at least one synchronization signal different from a synchronization signal block transmitted by the base station. The base station may further transmit the aperiodic transmission of the one or more instances of the at least one synchronization signal to at least one UE using the plurality of time resources.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a mobile station may receive, from a network node, an indication of a condition associated with switching between a first waveform and a second waveform or between a first set of waveform parameters for the first waveform and a second set of waveform parameters for the first waveform, wherein the condition is based at least in part on one or more network parameters. The mobile station may communicate, with the network node, using at least one of: the first waveform or the second waveform, or the first set of waveform parameters or the second set of waveform parameters, based at least in part on whether the condition is detected by the mobile station. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. To indicate a precoder sequence for uplink transmissions, a base station may transmit a message to a UE that configures a sequence of at least two sets of precoding parameters. Each set of precoding parameters may correspond to an uplink message. For example, a first set of precoding parameters of the sequence may correspond to a first uplink message and a second set of precoding parameters of the sequence may correspond to a second uplink message that is subsequent to the first uplink message in a time domain. The UE may receive the message and transmit, to the base station, the first uplink message using the first set of precoding parameters and the second uplink message using the second set of precoding parameters based on the sequence of the at least two sets of precoding parameters.

Abstract: A wireless device (e.g., a UE or a base station) may generate a hybrid symbol including a CP portion, a data portion, and at least one of a header portion or a tail portion. The CP portion may be located at a beginning of the hybrid symbol, and may include one or more CP samples that correspond to a predefined number of samples at an end of the hybrid symbol. The data portion may be located after the header portion or before the tail portion. The header portion may be located after the CP portion, and may include one or more predefined header samples. The tail portion may be located at the end of the hybrid symbol, and may include one or more predefined tail samples. The wireless device may generate a waveform including the generated hybrid symbol. The wireless device may transmit a signal based on the generated waveform.

Abstract: Methods, systems, and devices for wireless communication are described. In some wireless communications systems, a base station may transmit, to a user equipment (UE), an indication of a dynamic switch between slot formats. The base station and the UE may communicate first data in one or more first slots according to a first slot format. The first slot format may be a first cyclic prefix-based or guard interval-based slot format. The base station may transmit control signaling to the UE to indicate a second slot format different from the first slot format. The second slot format may be a second cyclic prefix-based or guard interval-based slot format. The UE and the base station may switch to communicating second data in one or more second slots in accordance with the second slot format based on the control signaling.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may establish, with a network entity, a wireless connection that uses a set of symbols per transmission time interval (TTI) for orthogonal frequency division multiplexing (OFDM) communications, where each symbol of the set of symbols may correspond to a fast Fourier transform (FFT) window and may include a guard interval (GI) portion and a data portion within the FFT window. In some examples, the UE may receive a control message indicating at least one parameter associated with a power offset between a data signal of the set of symbols and a reference signal of the set of symbols that is associated with the data signal. As such, the UE may communicate with the network entity, the data signal, and the reference signal according to the indicated power offset using the set of symbols.

Abstract: Apparatus, methods, and computer-readable media for facilitating multiplexing of time-varying DMRS within a symbol are disclosed herein. An example method for wireless communication at a receiving device includes receiving a first symbol of a single carrier waveform, the first symbol including a first set of DMRS resources. The example method also includes receiving a second symbol of the single carrier waveform, the second symbol including a second set of DMRS resources, the second set of DMRS resources associated with at least one of a DMRS starting location and a DMRS duration that is different than the first set of DMRS resources.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) or a base station may generate a discrete Fourier transform (DFT) waveform from separate DFT inputs of data content, a guard interval (GI) sequence, and tail suppression samples. The UE or the base station may generate a first communication with the DFT waveform using an inverse fast Fourier transform (IFFT) operation. The first communication may include, in a time domain, a data signal corresponding to the data content and a GI-based tail signal that corresponds to the GI sequence and that is suppressed with a tail suppression signal based at least in part on the tail suppression samples. The UE or the base station may transmit the first communication. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) and a base station may communicate according to a combined cyclic prefix and guard interval-based waveform format. The base station may transmit control signaling to the UE. The control signaling may indicate a slot configuration. The UE may identify a format of a slot including a set of symbols based on the slot configuration. The format may indicate that a first portion of a first symbol of the set of symbols includes at least two cyclic prefixes and a second portion of the first symbol includes a guard interval. The UE and the base station may perform wireless communications during the first symbol in accordance with the format.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of a subcarrier spacing (SCS) for communications in a transmission time interval (TTI), such as a half-subframe, including multiple symbols, corresponding cyclic prefixes, and a padding duration which is at least as long as a symbol duration. The UE may receive a configuration for the padding duration, indicating that at least a portion of the padding duration is reallocated for a reference signal that indicates waveform parameters for one or more symbols of the TTI after the padding duration. The UE may receive the reference signal indicating the waveform parameters during the portion of the padding duration and communicate during the one or more symbols of the TTI according to the waveform parameters.

Abstract: Aspects described herein relate to multiplexing, in frequency and to generate a multiplexed set of data subcarriers, a first set of data subcarriers for a first user or a first channel with a second set of data subcarriers for a second user or a second channel, adding at least one set of redundant subcarriers to the multiplexed set of data subcarriers to be transmitted in a unique-word orthogonal frequency division multiplexing (UW-OFDM) waveform to produce at least one of head samples or tail samples for the UW-OFDM waveform, mapping the multiplexed set of data subcarriers and the at least one set of redundant subcarriers as input to an inverse fast Fourier transform (IFFT), and generating the UW-OFDM waveform based on an output of the IFFT.