Abstract: Methods, systems, and devices for wireless communications are described that provide for managing transmissions using multiple component carriers (CCs) in which transmissions using one or more of the CCs may span less than a full transmission time of a slot or other transmission time interval. A UE may signal a capability to transmit such transmissions, and one or more capabilities related to carrier aggregation that may be used by a base station for scheduling of transmissions on different CCs. In the event that overlapping transmissions on two or more CCs exceed a maximum power threshold, various techniques for dropping at least a portion of one or more transmissions of one or more CCs are described.

Abstract: Certain aspects of the present disclosure provide techniques for indicating carrier aggregation capabilities. An example method generally includes signaling, to a base station (BS), carrier aggregation capability information indicating a capability for performing separate operations concurrently on a plurality of component carriers; receiving a carrier aggregation configuration indicating component carriers designated for the separate operations; and receiving or transmitting transmissions based on the carrier aggregation configuration.

Abstract: Methods, systems, and devices are described for wireless communication at a device. A wireless device may be configured with a transmission time interval (TTI) bundling parameter. The device may then identify one or more resources for an uplink (UL) control channel based on the TTI bundling parameter (e.g., using either an implicit or an explicit indication from another wireless node such as a serving cell of a base station) and transmit the UL control channel using the identified resources. The device may also identify a downlink control information (DCI) format based on the TTI bundling parameter. For example, a resource allocation granularity level may be associated with the bundling parameter, and the length of a DCI field may depend on the resource allocation granularity level.

Abstract: Methods, systems, and devices for wireless communication are described. A method at a user equipment (UE) includes receiving signaling that indicates a carrier aggregation (CA) configuration (having carriers configured for UL and downlink (DL) data transmissions) and an auxiliary uplink (UL) configuration (having carriers configured for UL reference signal transmissions). The method also includes receiving a resource assignment on a DL carrier of the CA configuration, and transmitting an aperiodic sounding reference signal (A-SRS) using the one or more carriers of the auxiliary UL configuration based at least in part on the received resource assignment. Another method is performed by a UE having a CA configuration and an A-SRS configuration, including receiving a resource assignment on a DL carrier in the CA configuration, detecting a trigger for transmitting an A-SRS, determining UL resources of the A-SRS configuration for transmitting the A-SRS, and transmitting the A-SRS on the determined UL resources.

Abstract: Techniques are described for wireless communication. One method includes detecting a first reference signal received from a user equipment (UE) in a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band; and transmitting an indication of the determined contention window size to the UE.

Abstract: Certain aspects of the present disclosure propose techniques for transmission time interval (TTI) bundling for control channels (e.g., physical downlink control channel (PDCCH) and enhanced PDCCH) in long term evolution (LTE). According to certain aspects a method is provided for wireless communications. The method may be performed, for example, by a user equipment (UE). The method generally includes determining a first set of possible decoding candidates for the downlink control channel in a first subframe of the bundle of subframes and a second set of possible decoding candidates for the downlink control channel in a second subframe in the bundle of subframes, wherein the first set of possible decoding candidates and the second set of possible decoding candidates are different and processing the bundle of subframes based, at least in part, on the determination.

Abstract: A method and apparatus are provided for generating and reporting a reference power headroom report (PHR) for New Radio (NR). A user equipment (UE) decides to report a reference power headroom (PH) for at least one carrier frequency in a transmission time interval (TTI). The UE determines at least one of an index (j) of a target received power of a Physical Uplink Shared Channel (PUSCH) to be transmitted in the TTI and a path loss scaling factor, an index (qd) of a reference signal used for measuring path loss for the carrier frequency, or an index (l) of a power control process used for the carrier frequency. The UE then calculates the reference PH based on one or more of the determined at least one index, and reports, in the TTI, a PHR including the reference PH for the carrier frequency.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a timing advance (TA) command that includes a timing value for calculating a timing offset to be applied to adjust a timing of an uplink transmission; determine a numerology to be used to calculate the timing offset from the timing value; and calculate the timing offset using the timing value and the numerology, wherein the timing value corresponds to different timing offsets for different numerologies. Numerous other aspects are provided.

Abstract: Certain aspects of the present disclosure relate to techniques for assigning resources for low cost user equipments (UEs). A method for wireless communications by a user equipment (UE) is provided. The method generally includes determining a first bandwidth, within a second bandwidth, for resources available for downlink data transmissions, wherein the first bandwidth is greater than the second bandwidth, determining a third bandwidth for resources available for uplink transmissions, wherein a bandwidth for resources available for uplink transmissions is different than the bandwidth for resources available for downlink transmissions, wherein the third bandwidth is greater than the first bandwidth, and communicating with a network using the determined downlink and uplink resources.

Abstract: Aspects of the present disclosure relate to wireless communication. In some aspects, a user equipment (UE) may receive a downlink grant that does not include a downlink assignment index (DAI); determine a pre-defined bundle window, associated with ACK/NACK multiplexing or bundling, based at least in part on receiving the downlink grant that does not include the DAI; and transmit ACK/NACK feedback to acknowledge or negatively acknowledge one or more downlink communications received in the pre-defined bundle window. In some aspects, a UE may receive a downlink grant that does not include a DAI; determine a bundle window, associated with ACK/NACK multiplexing or bundling, based at least in part on receiving the downlink grant that does not include the DAI, wherein the bundle window is not pre-defined; and transmit ACK/NACK feedback to acknowledge or negatively acknowledge one or more downlink communications received in the bundle window. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for wireless communications are described. A network device such as a next generation (gNB) may identify control information for transmission on a downlink control channel e.g., a physical downlink control channel (PDCCH). The network device may identify a candidate set of decoding candidates to which the control information is able to be mapped. In some examples, each decoding candidate may include one or more control channel elements (CCEs). The network device may select, from the candidate set of decoding candidates, an actual set of decoding candidates to which the control information is to actually be mapped, and map the control information into the actual set of decoding candidates. Upon decoding the control information, the network device may transmit the control information within a search space including the actual set of decoding candidates to a user equipment (UE).

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may use multiple-input multiple-output (MIMO) layer specific and codeword specific communication configurations to communicate with multiple base stations. For example, multiple base stations may be configured to provide coordinated multipoint (CoMP) transmissions to the UE. One or more of the base stations may transmit a set of communications configurations to the UE that includes at least one MIMO layer specific or codeword specific configuration. The UE may then receive a dynamic indication of which communication configuration to use during a specific time period. The UE may then communicate with one or more of the base stations using the indicated configuration during the specified time period.

Abstract: Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive RACH configuration information on a downlink carrier of a first set of carriers, wherein the RACH configuration information pertains to the first set of carriers and to a second set of carriers; and selectively perform a RACH procedure with regard to the first set of carriers or the second set of carriers based at least in part on the RACH configuration information. Numerous other aspects are provided.

Abstract: Mapping with CSI-RS resources with a code divisional multiplex (CDM) length of eight is disclosed. Such mapping allows for flexibly configuring the set of resource elements (REs) for mapping based on the available CSI-RS resources.

Abstract: Cell selection techniques are provided for network access to cells that may employ one or more coverage enhancement techniques. A user equipment (UE), which may be a machine type communication (MTC) device, upon initial acquisition or upon wakeup may measure a reference signal received power (RSRP), reference signal received quality (RSRQ), or both, and determine a cell selection value based at least in part on the RSRP, RSRQ, or a combination thereof. The cell selection value may be determined based on an offset, which may be selected based on a measurement accuracy capability of the UE. UE sequential access attempts, neighbor cell list information that may include coverage enhancement of neighboring cells transmissions, and cell re-selection measurement frequency adjustments are also described.

Abstract: Methods, systems, and devices for wireless communications are described. Techniques are described herein for managing timers for hybrid automatic repeat request (HARQ) processes associated with multiple configured grants that are active at the same time. Techniques are also described herein for allocating HARQ identifiers (IDs) to HARQ processes associated with multiple configured grants that are active at the same time. A user equipment (UE) may configure timers to be associated with a HARQ ID and a configured grant. A base station or UE may include indicators of the configured grants associated with a HARQ process when exchanging signaling about the HARQ process. A UE may allocate HARQ IDs to multiple configured grants to reduce a likelihood that HARQ processes collide.

Abstract: This disclosure describes methods, devices, and systems for techniques related to random access procedures, such as a two-step random access procedure. Generally, the described techniques support physical uplink shared channel (PUSCH) occasion (PO) aggregation in random access procedures, including aggregation configurations and communication schemes that support enhanced data transmissions, such as small data transmissions, in random access procedures. In some examples, the described techniques may include aggregating POs in a time domain, or a frequency domain, or both. A device, such as a user equipment (UE) may aggregate, in one or more of a time domain or a frequency domain, multiple POs of a set of POs, and transmit, to a device such as a base station, a random access payload of a random access message on a PUSCH using time and frequency resources of the aggregated multiple POs.

Abstract: The present disclosure describes various aspects of the implementation and design of Physical Downlink Control Channel (PDCCH) in 5G new radio (NR) applications. Aspects include methods, apparatuses, and computer-readable medium for one or more of multiple PDCCH search spaces, control resource block (CRB), irregular multiple slots or mini-slots grants, or fast control channel signaling for grant-free uplink (UL). For example, different scheduling entities can each have one or two search spaces defined (e.g., common and/or user equipment (UE)-centric search spaces). Also, CRBs can be used as units for PDCCH transmission instead of resource element groups/control channel elements (REGs/CCEs). In addition, irregularities in time domain, frequency domain, or both can be introduced in the granting of resource blocks (RBs) over multiple slots or mini-slots. Moreover, signaling can be used to indicate to a UE configured for grant-free UL the portion of the pool of resources available for grant-free UL.

Abstract: Various aspects of the present disclosure provides methods and techniques for flexible positioning of a uplink short burst in NR communications. In one example, the uplink short burst may have a slot position that at any position of the uplink centric slot. For instance, a downlink centric slot may contain control signals from a base station, such as a grant, that indicate the slot position of the uplink short burst. The grant may indicate, explicitly or implicitly, the position within an uplink centric slot that should be assigned to an uplink short burst. The UE may then transmit a response including an uplink short burst within the indicated slot position of an uplink centric slot. The various aspects may thus enable the dynamic assignment of uplink short bursts within uplink centric slots.

Abstract: Methods, systems, and devices are described for wireless communication. One method includes identifying uplink control information (UCI) for a component carrier (CC) of a carrier aggregation (CA) configuration which may include a primary cell (PCell) and, in some aspects, a physical uplink control channel (PUCCH) enabled secondary cell (SCell); determining to include cyclic redundancy check (CRC) information for the UCI based at least in part on a UCI characteristic or an uplink control channel format; and transmitting an uplink channel comprising the UCI and the CRC information.