Abstract: Techniques are described for wireless communication. One method includes receiving, in a downlink portion of a transmission structure on a shared radio frequency spectrum band, an uplink grant for an uplink data portion of the transmission structure. The transmission structure includes the downlink portion, followed by and time domain multiplexed with an uplink control portion, followed by and time domain multiplexed with the uplink data portion. The method also includes retaining access to the shared radio frequency spectrum band by transmitting an unscheduled transmission during the uplink control portion of the transmission structure.

Abstract: Methods, systems, and devices for wireless communications are described. A wireless device, such as a base station or a user equipment, may identify an energy detection threshold for a sensing beam associated with a channel access procedure, such as a listen-before-talk (LBT) procedure. The wireless device may also identify a set of transmit power parameters for one or more transmit beams. The wireless device may determine a degree of overlap between a beam shape of one or more transmit beams and a beam shape (e.g., a coverage area) of the sensing beam. The wireless device may adjust the set of transmit power parameters, the energy detection threshold, or a combination thereof based on the degree of overlap. The wireless device may perform the channel access procedure based on the determining, the adjusting, or both.

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, transmissions from a neighboring base station may interfere with downlink transmissions from a serving base station to a target user equipment (UE). To coordinate interference between the base stations (e.g., mitigate interference, stabilize interference, etc.), the serving base station may generate an interference coordination message and may transmit the message over-the-air (OTA) to one or more neighboring base stations. The message may include parameters indicating a coordination scheme for the neighboring base station(s) to use for modifying one or more scheduling decisions. The coordination scheme may be configured or dynamically selected and may include interfering beam fixation, interfering beam suppression, or interfering beam avoidance.

Abstract: Methods, systems, and devices for wireless communications are described. A size of a hybrid automatic repeat request (HARQ)-acknowledgment (ACK) codebook may be determined and indicated when the HARQ-ACK codebook is transmitted. For example, a user equipment (UE) may transmit a number of information bits within a HARQ-ACK codebook, and may further indicate a size of the HARQ-ACK codebook based on the number of information bits. The UE may transmit the indication of the size of the HARQ-ACK codebook on the same or different time/frequency resources as the HARQ-ACK codebook, using a particular field, using a different uplink channels, or the like. Additionally or alternatively, the UE may indicate the size of the HARQ-ACK codebook using a particular pattern or sequence of reference signals associated with the channel used to carry the HARQ-ACK codebook.

Abstract: Methods, systems, and devices for wireless communications are described that provide for mobility between base stations for a UE that may be in a coverage extension (CE) mode or a non-CE mode. A serving base station may provide a UE with an indication of one or more neighboring base stations within a same public mobile land network (PLMN). The UE may then prioritize base stations in the same PLMN ahead of other neighboring base stations within a same frequency priority in a reselection procedure. In some cases, a base station may allocate PLMN-specific CE mode random access resources and transmit CE mode broadcast transmissions upon request from a UE within the PLMN. In some cases, a UE operating in CE mode may use contention-based random access resources for random access requests rather than dedicated random access resources.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of one or more waveforms supported by a base station, wherein the one or more waveforms include at least one of an orthogonal frequency division multiplexing (OFDM) waveform, a single carrier frequency domain (SC-FD) waveform, or a single carrier time domain (SC-TD) waveform. The UE may determine whether the UE is capable of communicating with the base station based at least in part on the indication. The UE may selectively communicate with the base station using at least one waveform of the one or more waveforms based at least in part on the determination. Numerous other aspects are provided.

Abstract: Wireless communications systems and methods related to multiplexing uplink control channel signals from different users are provided. A first wireless communication device obtains an uplink control channel multiplex configuration indicating a first frequency spreading sequence and at least one of a second frequency spreading sequence or a first spatial direction. The first wireless communication device communicates, with a second wireless communication device, a first uplink control channel signal including a first reference signal and a first uplink control information signal in a frequency spectrum based on the uplink control channel multiplex configuration. The first reference signal is based on the first frequency spreading sequence and the first uplink control information signal is based on at least one of the second frequency spreading sequence or the first spatial direction.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) in communication with a serving base station may identify that the UE is a potential victim of interference from a neighboring base station. The UE may transmit an interference coordination message to the neighboring base station. The interference coordination message may request modification of one or more transmission parameters at the neighboring base station. The neighboring base station may modify its transmission parameters to decrease interference with the UE, and the UE may communicate with the serving base station after transmitting the interference coordination message.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a control channel that uses an orthogonal frequency division multiplexing (OFDM) waveform. The UE may transmit or receiving a data channel, associated with the control channel, that uses a single-carrier (SC) waveform. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for time domain single carrier (SC) waveform communications are described. A user equipment (UE) may generate an SC waveform by resampling (e.g., up-sampling) mapped information bits prior to insertion of a cyclic prefix (CP) or guard interval (GI). Performing resampling prior to CP/GI insertion allows for resource allocation flexibility and a base station may allocate resources for the SC waveform in accordance with this flexibility. For example, a base station may not be limited or restricted to a certain number of resources for SC waveform communications and may therefore determine a resource allocation for the UE based on the capability of the UE to perform resampling prior to CP/GI insertion. The resampling may be performed according to a set of parameters including a resampling ratio, which may be indicated to the UE via control signaling (e.g., from the base station).

Abstract: Methods, systems, and devices for wireless communications are described to enable a user equipment (UE) or a base station to transmit and receive single carrier (SC) waveforms (e.g., corresponding to uplink or downlink transmissions) using an SC transmission configuration. In some cases, a UE and a base station may employ an SC configuration to identify resource elements (REs) for uplink or downlink SC signals. Additionally or alternatively, the UE and the base station may employ an SC configuration with a different cyclic prefix (CP) length in order to change a base amount of REs that may be allocated for an SC transmission, where the different CP length may be either static or dynamic. The base station may transmit an indication of an SC configuration to the UE, and the UE and the base station may process corresponding SC downlink or uplink communications according to the indicated SC configuration.

Abstract: Wireless communications systems and methods related to signaling medium reservation information medium sharing among multiple radio technologies (RATs) are provided. A wireless communication device of a first RAT detects a channel reservation signal of a second RAT in a spectrum shared by the first RAT and the second RAT. The wireless communication device determines whether the channel reservation signal indicates a first transmission opportunity (TXOP) duration or a second TXOP duration that is different from the first TXOP duration. The wireless communication device selects, based on the determination, at least one of performing a backoff or continuing to monitor the spectrum.

Abstract: Wireless communications systems and methods related to multiplexing uplink control channel signals from different users are provided. A first wireless communication device obtains an uplink control channel multiplex configuration indicating a first frequency spreading sequence and at least one of a second frequency spreading sequence or a first spatial direction. The first wireless communication device communicates, with a second wireless communication device, a first uplink control channel signal including a first reference signal and a first uplink control information signal in a frequency spectrum based on the uplink control channel multiplex configuration. The first reference signal is based on the first frequency spreading sequence and the first uplink control information signal is based on at least one of the second frequency spreading sequence or the first spatial direction.

Abstract: Wireless communications systems and methods related to providing feedback for DL data are provided. A first wireless communication device communicates with a second wireless communication device, a first communication signal. The first wireless communication device communicates the second wireless communication device, a grant for retransmitting a feedback associated with the first communication signal. The first wireless communication device communicates with the second wireless communication device, the feedback based on the grant.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify, based at least in part on monitoring a set of channels for signals during a monitoring window, a subset of channels in which signals were detected during the monitoring window. The UE may select, based at least in part on the subset of channels, a format for a first sub-codebook and a second sub-codebook, the second sub-codebook indicating a feedback state for corresponding data transmissions received on the channels within the subset of channels. The UE may transmit the first uplink control message using a first sub-codebook, the first uplink control message identifying the format for the second sub-codebook and identifying the channels within the subset of channels. The UE may transmit a second uplink control message using the second sub-codebook according to the selected format.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a plurality of downlink grants for a corresponding plurality of data transmissions, wherein each downlink grant identifies resources for receiving the corresponding data transmission and indicates whether the corresponding data transmission comprises a last data transmission for a reporting occasion. The UE may determine, based at least in part on the received downlink grants, that a last downlink grant for the last data transmission associated with the reporting occasion was not received. The UE may transmit a feedback report during the reporting occasion, wherein a format of the feedback report is based at least in part on the last downlink grant for the last data transmission not being received.

Abstract: Wireless communications systems and methods related to transmitting communication signals are provided. A first wireless communication device performs a first LBT during a first time period for transmitting a first communication signal associated with a first priority. The first wireless communication device performs a second LBT during a second time period for transmitting a second communication signal associated with a second priority, wherein the first time period is at least partially overlapping with the second time period, and wherein the first priority is different from the second priority. The first wireless communication device communicates with a second wireless communication device, at least one of the first communication signal or the second communication signal based on at least one of the first LBT or the second LBT.

Abstract: Methods, systems, and devices for wireless communications are described. A size of a hybrid automatic repeat request (HARQ)-acknowledgment (ACK) codebook may be determined and indicated when the HARQ-ACK codebook is transmitted. For example, a user equipment (UE) may transmit a number of information bits within a HARQ-ACK codebook, and may further indicate a size of the HARQ-ACK codebook based on the number of information bits. The UE may transmit the indication of the size of the HARQ-ACK codebook on the same or different time/frequency resources as the HARQ-ACK codebook, using a particular field, using a different uplink channels, or the like. Additionally or alternatively, the UE may indicate the size of the HARQ-ACK codebook using a particular pattern or sequence of reference signals associated with the channel used to carry the HARQ-ACK codebook.

Abstract: A universal Channel Reservation Signal (CRS) is transmitted by a wireless network node on a frequency channel upon successful Clear Channel Assessment (CCA). The channel reservation signal includes a preamble that has a predetermined pattern, a message having a same short period waveform as the preamble, and a synchronization field (SYNC) disposed between the preamble and the message. The message is encoded to prevent any and all occurrences therein of at least one of the predetermined pattern or a combination of the predetermined pattern and at least part of the SYNC. The universal CRS can be transmitted and successfully received and processed by both NR-SS devices and devices of at least one other wireless communication protocol having a different numerology, such as WiFi. Thus, information can be shared and used to avoid transmitting or to reduce or avoid collisions and interference between devices of different RATs.

Abstract: A base station may access a channel following a successful channel access procedure. The base station may transmit an indication of a resource allocation to a user equipment (UE). The resource allocation may include an allocation of resources for subsequent communications between the base station and the UE, for example, defining a set of transmission time intervals (TTIs) during which the UE may transmit repetitions of uplink control information. The UE may also perform a channel access procedure to access the channel. The UE may transmit repetitions of the uplink control information using the set of TTIs according to the resource configuration. In some cases, the UE may stop transmitting uplink control information repetitions after a maximum number repetitions also according to the resource configuration. The base station may then receive and combine the uplink control information.