Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter node may determine a set of desired transmit beams to use for transmissions during a channel occupancy time (COT), wherein each transmit beam in the set of desired transmit beams is associated with an energy detection threshold (EDT). The transmitter node may configure a sensing beam associated with a directional listen-before-talk (LBT) procedure, wherein the sensing beam is associated with an EDT that is at least as strict as a strictest EDT associated with the set of desired transmit beams. The transmitter node may transmit using the set of desired transmit beams during the COT, wherein the COT is initiated based at least in part on an indication that the directional LBT procedure succeeded using the sensing beam. Numerous other aspects are described.

Abstract: Aspects are provided which improve LBT by associating contention windows with transmission burst lengths and by allowing contention windows and maximum burst lengths to be adjusted based on interference activity. For downlink, a UE receives a PG for a downlink transmission from a base station indicating a CCA length based on a contention window size associated at least with a burst length for the downlink transmission. The UE performs, after receiving the pre-grant, a CCA based on the CCA length, transmits an APG to the base station when the CCA is successful, and receives the downlink transmission in response to the APG. For uplink, the base station performs a CCA based on a contention window associated at least with a burst length for an uplink transmission, transmits an uplink grant to the UE when the CCA is successful, and receives the uplink transmission in response to the uplink grant.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for selecting a beam to be allocated for transmitting downlink (DL) data to user equipment (UE). In some implementations, a UE receives a reference signal on each of a number of beams associated with a base station, and determines a delay spread value for each beam. The UE identifies each beam for which the determined channel delay spread value is less than a threshold value, and determines a reference signal received power (RSRP) level for each identified beam. The UE transmits an indication of the determined RSRP levels of the identified beams to the base station, and receives, in response to the transmitted indication, a selection of the beam to be allocated for DL transmissions to the UE.

Abstract: Methods, systems, and devices for wireless communications are described. A first wireless device may receive a clear channel assessment trigger from a second wireless device, the clear channel assessment trigger associated with a data transmission by the second wireless device. The first wireless device may transmit, based at least in part on a result of a first clear channel assessment procedure, feedback information for the clear channel assessment trigger. The first wireless device may receive the data transmission based at least in part on the feedback information for the first clear channel assessment procedure. The first wireless device may transmit, based at least in part on a result of a second clear channel assessment procedure, feedback information for the data transmission, wherein the first clear channel assessment procedure has a first duration that is longer than a second duration for the second clear channel assessment procedure.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive single downlink control information (DCI) that indicates resources for a plurality of transmission configuration indicator (TCI) states for transmitting or receiving communications in a plurality of transmission time intervals (TTIs). The UE may transmit or receive the communications in the plurality of TTIs in accordance with the DCI. Numerous other aspects are provided.

Abstract: Certain aspects of the present disclosure provide techniques for including physical layer RSSI in CSI reporting. In some cases, a method for wireless communications by a user equipment (UE) includes receiving a channel state information (CSI) reporting configuration that specifies physical layer received signal strength indicator (RSSI) measurement as a report quantity, performing physical layer RSSI measurement, and reporting the RSSI to a network entity in accordance with the CSI reporting configuration.

Abstract: Certain aspects of the present disclosure provide techniques for implicitly determining a receive beam for a UE to use for received signal strength indicator (RSSI) measurement. For example, the UE may perform RSSI measurement with a receive beam implicitly determined at the UE and report the RSSI to a network entity.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for selecting a minimum measurement duration in listen-before-talk (LBT) sensing slots for high band unlicensed channel access. In some examples, a device may select a minimum sensing duration for an LBT procedure according to a sensing bandwidth or an energy threshold (such as an energy detection threshold or an energy power spectral density threshold), or both. As part of the LBT procedure, the device may measure or sense a wireless channel for at least the selected minimum sensing duration in each sensing slot of the LBT procedure. The device may selectively transmit on the wireless channel according to a result of the LBT procedure. For example, the device may either transmit or refrain from transmitting on the wireless channel depending on whether the device senses the wireless channel to be available.

Abstract: Methods related to wireless communications systems and medium access in a radio frequency band of a shared spectrum are provided. A device contends for a first reserved time interlace including a plurality of channel occupancy times (COTs). The device transmits a first communication signal in a first COT of the plurality of COTs in response to winning the first reserved time interlace. The device transmits a second communication signal in a second COT of the plurality of COTs, the second COT spaced in time from the first COT, in response to winning the first reserved time interlace.

Abstract: A method of wireless communication performed by a wireless communications device may include receiving, from a second wireless communication device, one or more signals associated with a beam parameter, determining, for each of a plurality of locations within a first zone, a first signal measurement for the one or more received signals, determining, at each of a plurality of locations within a second zone, a second signal measurement for the one or more received signals, wherein the second zone is different from the first zone, and determining whether the second wireless communication device satisfies an interference condition based at least in part on a cumulative distribution of at least one of the first signal measurements at the plurality of locations within the first zone or a cumulative distribution of at least one of the second signal measurements at the plurality of locations within the second zone.

Abstract: In a particular implementation, a method includes receiving, at a first base station from a second base station via a backhaul communication, a scheduling message indicating one or more beams of the second base station that are scheduled for use in upcoming transmissions. The second base station is a neighboring base station of the first base station. The method further includes transmitting, from the first base station to a user equipment (UE), the scheduling message.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a first transmit receive point (TRP), a downlink control information (DCI) communication, the UE being included in a multi-TRP configuration with the first TRP and a second TRP. The UE may determine information unique to the first TRP. The information unique to the first TRP may be at least one of associated with the DCI communication or included in the DCI communication. The UE may generate a downlink scrambling sequence initialization code, associated with the first TRP, based at least in part on the information unique to the first TRP. The UE may generate a downlink scrambling sequence, associated with the first TRP, based at least in part on the downlink scrambling sequence initialization code associated with the first TRP. Numerous other aspects are provided.

Abstract: A method of wireless communication includes performing, by a user equipment (UE) device, a channel sensing operation during a first window of a frame period associated with a wireless communication network. Performing the channel sensing operation includes performing a direction-based scan of one or more beams associated with the wireless communication network, and the channel sensing operation is included in a joint sensing operation performed with a base station. The method further includes, based at least in part on a result of the channel sensing operation, determining whether to perform, during a second window of the frame period, one or more communication operations with the base station.

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 coverage area of one or more transmit beams and 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 communication are described. A base station may determine a measurement scheme or uplink mode and then transmit an indication of the scheme or uplink mode to an associated user equipment (UE). The base station may identify a set of hidden nodes for the UE and configure the UE for autonomous or grant-based uplink transmissions accordingly. A UE may initiate a channel clearance scheme by transmitting a first channel clearance signal (e.g., a request-to-send message), which may include a UE identifier before transmitting an uplink message in the unlicensed radio frequency spectrum band. In response, the base station may transmit a second channel clearance signal (e.g., a clear-to-send message). In some cases, the second channel clearance signal may include control information or may be transmitted at a power level that is based on a characteristic of the UE.

Abstract: Enhanced measurements for new radio-unlicensed (NR-U) operations are disclosed. Compatible user equipments (UEs) may be configured to perform virtual full listen before talk (LBT) procedures for measurement purposes. The UEs may then compile LBT statistics derived from the virtual LBT procedures and include such statistics in an enhanced measurement report the their serving base stations. The LBT statistics provide a more direct and detailed reflection of the usage of a shared communication channel. Such UEs may further be configured to gather additional LBT statistics from transmission-based LBT procedures in addition to the virtual LBT procedures. The additional direct and detailed usage of a shared channel may then be provided in the enhanced measurement reports in accordance with described aspects.

Abstract: Wireless communications systems and methods related to listen-before-talk (LBT) are provided. A first wireless communication device performs an LBT in a channel to contend for a first transmission opportunity (TXOP). The first wireless communication device receives, from a second wireless communication device, a first reservation signal reserving a second TXOP in the channel in response to the LBT, the second TXOP being different from the first TXOP. The first wireless communication device adjusts a signal detection threshold based on transmit power information associated with at least one of the first wireless communication device, the second wireless communication device, first data traffic to be communicated in the first TXOP, or second data traffic to be communicated in the second TXOP. The first wireless communication device determines whether to yield channel access during the second TXOP based on a signal measurement of the first reservation signal and the adjusted signal detection threshold.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for selecting a minimum measurement duration in listen-before-talk (LBT) sensing slots for high band unlicensed channel access. In some examples, a device may select a minimum sensing duration for an LBT procedure according to a sensing bandwidth or an energy threshold (such as an energy detection threshold or an energy power spectral density threshold), or both. As part of the LBT procedure, the device may measure or sense a wireless channel for at least the selected minimum sensing duration in each sensing slot of the LBT procedure. The device may selectively transmit on the wireless channel according to a result of the LBT procedure. For example, the device may either transmit or refrain from transmitting on the wireless channel depending on whether the device senses the wireless channel to be available.

Abstract: In a particular implementation, a method of wireless communication includes detecting, at a user equipment (UE) associated with a first base station, one or more interfering beams generated by a second base station. The second base station is a neighboring base station of the first base station. The method also includes transmitting, from the UE to the first base station, an interference identification message indicating the one or more interfering beams. The method further includes receiving, from the first base station, a scheduling message indicating a set of beams of the second base station that are scheduled for use in upcoming transmissions.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device (WCD) may communicate, during a channel occupancy time (COT) associated with one or more resources, via a no listen before talk (no-LBT) channel access mode. The WCD may initiate, after the COT, a reduced COT associated with the one or more resources, wherein the WCD is configured to reduce channel occupancy during the reduced COT. Numerous other aspects are described.