Abstract: Uplink clear channel assessment (CCA) status is disclosed as a new uplink control message for new radio (NR) unlicensed (NR-U) operations. When an opportunity for potential uplink transmissions arises for a user equipment (UE), the UE will perform a CCA procedure on available uplink resources. The UE reports the results of the CCA procedure to a serving base station via an uplink control message, such as an uplink control information (UCI), physical uplink control channel (PUCCH), or the like. The serving base station may then use the CCA results in scheduling uplink transmissions and reserving uplink resources.

Abstract: Techniques are described for wireless communication. A first method includes transmitting a first signal to indicate accessing a first channel in a radio frequency spectrum band, and transmitting information with the first signal in the radio frequency spectrum band. A second method includes winning contention to access a radio frequency spectrum band, and after the winning contention to access the radio frequency spectrum band, transmitting a first signal to align a starting point of a second signal with a reference boundary associated with the radio frequency spectrum band. A third method includes winning contention to access a radio frequency spectrum band during a first frame period, the first frame selected from a plurality of different frame periods, and transmitting a signal at a periodicity during one or more subframes of the first frame period for each of the plurality of different frame periods.

Abstract: Methods, systems, and devices for wireless communication are described. Generally, the described techniques performed at a user equipment (UE) provide for communicating directly with a base station using a first set of antennas and communicating indirectly with the base station (e.g., via a wireless node, a remote radio head, etc.) using a second set of antennas to fully exploit the potential capabilities of the physical antennas at the UE. For downlink communications, a UE may receive at least a subset of downlink signals from a base station via a wireless node, and, for uplink communications, the UE may transmit at least a subset of uplink signals to the base station via a wireless node. To facilitate these techniques, the UE may configure the wireless node to forward downlink signals received from the base station to the UE or to forward uplink signals received from the UE to the base station.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may identify uplink (UL) control information (UCI) to transmit during a subframe. The UE may then select a UL channel on which to transmit the UCI based on whether a shared data and control UL channel employs contention-based scheduling. For example, multiple UEs could contend for access to the same semi-persistently scheduled (SPS) physical UL shared channel (PUSCH). Each UE may utilize a different demodulation reference (DMRS) signal cyclic shift to identify their transmissions. In some cases, some UCI, such as channel state information (CSI), may be transmitted on a contention-based PUSCH, while other UCI, such as acknowledgement information, may be transmitted on a physical uplink control channel (PUCCH). In some cases, the channel selection may be based on a configuration received from a base station.

Abstract: Techniques for transmitting and receiving wireless communications over an unlicensed radio frequency spectrum band are disclosed, including techniques for transmitting and receiving system information blocks over the unlicensed radio frequency spectrum band, techniques for gaining access to the unlicensed radio frequency spectrum band by performing extended clear channel assessments (ECCAs), techniques for transmitting and receiving synchronization signals and reference signals over the unlicensed radio frequency spectrum band, techniques for identifying starting times of downlink transmissions over the unlicensed radio frequency spectrum band, techniques for transmitting and receiving clear channel assessment (CCA)-exempt transmissions over the unlicensed radio frequency spectrum band, techniques for performing random access over the unlicensed radio frequency spectrum band, and techniques for dynamically modifying a transmission mode over the unlicensed radio frequency spectrum band.

Abstract: Autonomous uplink (AUL) for wideband new radio (NR) unlicensed (NR-U) operations is disclosed. For user equipments (UEs) that have been configured for AUL transmissions and have received an activation signal to activate the AUL capabilities, further indications may be used to enable AUL transmissions on AUL transmission opportunities (TxOPs) that overlap the timing of a current TxOP reserved by a serving base station, but that are allocated outside of the resources reserved for the current TxOP. A UE that identifies a desired, next AUL TxOP that overlaps the current base station-initiated TxOP duration, but is allocated for resources outside of the current TxOP resources determines whether it has obtained an enablement indication either directly from the serving base station or implicitly, based on current conditions at the UE. When the UE determines that it has obtained an enabling indication, it may then perform AUL transmissions via the overlapping AUL TxOP.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify that the UE is configured to use a two-step random access channel (RACH) procedure. The two-step RACH procedure may include an uplink request message and a downlink response. The UE may transmit the uplink request message as part of the two-step RACH procedure, and the uplink request message may include a preamble portion that is one of a set of predefined sequences and a payload portion that includes a physical uplink shared channel waveform. The UE may receive the downlink response as part of the two-step RACH procedure and in response to the uplink request message.

Abstract: Aspects directed towards a frame-based equipment (FBE) design for a multi-operator New Radio shared spectrum (NR-SS) are disclosed. In one example, at least one contention slot is monitored within a fixed frame period of an unlicensed spectrum, and a determination is performed of whether a channel reservation signal associated with a higher priority node has been detected within the at least one contention slot. For this example, the at least one contention slot is associated with a resource of a subsequent fixed frame period of the unlicensed spectrum. A determination is then made of whether to transmit communication via the resource. Here, the communication is transmitted via the resource, if the channel reservation signal is not detected, and the communication is not transmitted via the resource, if the channel reservation signal is detected.

Abstract: New radio (NR) transmission opportunity (TxOP) structure having flexible starting points are disclosed for wireless communications. When a typical listen before talk (LBT) procedure is performed, the transmitting node will not know ahead of time when the LBT will pass and, thus, when data transmissions can start. NR systems may include a mini-slot design for accommodating transmission units smaller than a slot. Aspects of the present disclosure provide for flexibly increasing the number of potential starting transmission boundaries depending on when the LBT pass is detected. Alternative aspects of the present disclosure determine the potential starting transmission points using a mini-slot based design, a floating slot based design, or a punctured slot based design with a code block group (CBG) level retransmission mechanism.

Abstract: Aspects of the present disclosure relate to wireless communications and, more particularly, to synchronization for standalone long term evolution (LTE) broadcast. In one aspect, a method is provided which may be performed by a wireless device such as a user equipment (UE). The method generally monitoring, within anchor subframes occurring at a first periodicity, for synchronization signals of a first type, obtaining an indication of one or more unicast subframes scheduled to occur between anchor subframes, and obtaining an indication of one or more broadcast subframes scheduled to occur between anchor subframes.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a first indication of at least one first downlink reference signal. Accordingly, the UE may measure, using a first antenna panel of the UE, the at least one first downlink reference signal. The UE may transmit, to the base station, a report based at least in part on measuring the at least one first downlink reference signal using the first antenna panel. Numerous other aspects are provided.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, an indication of at least one first beam and at least one first antenna panel of the UE, to use for one or more first transmissions, and of at least one second beam and at least one second antenna panel of the UE, to use for one or more second transmissions. Accordingly, the UE may communicate the one or more first transmissions, with the base station, using the at least one first beam and the at least one first antenna panel. Additionally, the UE may communicate the one or more second transmissions, with the base station, using the at least one second beam and the at least one second antenna panel. Numerous other aspects are provided.

Abstract: A discovery measurement timing configuration (DMTC) window reservation signal is disclosed for new radio (NR) shared spectrum (NR-SS) networks. The DMTC window is defined providing a reserved location for transmission of essential control signaling and potentially high priority traffic that may be transmitted in a prioritized manner. Access within the DMTC window may be provided with a clear channel assessment (CCA) exempt transmission (CET) option or a non-CET option. When the CET option is used, the reservation duration and period may be conveyed through the channel reservation signal. User equipments (UEs) that detect the reservation signal may re-transmit with added offset to inform neighboring base station that may not be within range of the serving base station. Base station that receive either the transmitted or re-transmitted reservation signal will refrain from communications that may interfere with the reception at the UEs.

Abstract: Two-phase floating-instant coordinated multipoint (CoMP) operation is disclosed. The CoMP operation may be initiated by the network via a CoMP cluster of network nodes or by user equipments (UEs) configured for uplink CoMP transmissions. The first phase is initiated after a first node to conduct a successful full listen before talk (LBT) procedure signals the other participating nodes to perform an abbreviated LBT procedure and identifies the beginning of the second phase. After success of the full and abbreviated LBT procedures, each associated node will initiate a first transmission in the first phase. The leading node determines how many of the other nodes are available for transmission and decides, based on that amount and the rules of the network, whether to continue with the CoMP operations. If enough of the other nodes are available, the participating nodes will conduct the CoMP transmissions at the identified beginning of the second phase.

Abstract: A method of wireless communication includes determining, by a communication device, a value of a counter associated with a listen-before-talk (LBT) operation. The method further includes, after determining the value of the counter and during a first portion of a deferral interval associated with the LBT operation, performing a first measurement of a particular duration to determine a first energy value. The method further includes, during a second portion of the deferral interval subsequent to the first portion, performing a second measurement of the particular duration to determine a second energy value. The method also includes determining whether to initiate a contention interval associated with the LBT operation based on the first energy value and further based on the second energy value.

Abstract: A method of wireless communication includes receiving, by a user equipment (UE) from a base station, a listen-before-talk (LBT) configuration message indicating whether category 2 (Cat2) LBT operations are enabled or disabled for the UE. The method further includes receiving, by the UE from the base station, a channel occupancy time (COT) message configuring the UE with a COT. The method further includes performing, by the UE, an LBT operation based on the LBT configuration message and based on the COT message.

Abstract: Methods, systems, and devices are described for wireless communication at a UE. A wireless devices may use a shared or unlicensed spectrum configuration based on a prioritization scheme for the shared frequency resources. The prioritization scheme may assign a priority to different operators and may enable devices associated with a prioritized operator to access the shared band over non-prioritized devices. For example, a non-prioritized device may win the channel and begin communicating over the shared or unlicensed spectrum. The non-prioritized device may then periodically cease transmission for a set interval (i.e., a preemption opportunity) and listen for an indication that a prioritized device wishes to use the channel. If a prioritized device begins transmitting (or, in some cases, if the prioritized device transmits a medium preemption indication) the non-prioritized device may relinquish control of the channel.

Abstract: This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for enabling user equipment (UE) mobility within an area. In one aspect, a base station (BS) may configure a set of cells for serving a UE, as well as a set of relay UEs to relay communications for the UE, for example via sidelink communications. The BS may transmit control signaling to the UE indicating the configured set of cells and the set of relay UEs. The UE may establish communications links via sidelink connections with one or more of the relay UEs, and determine an activated subset of cells for data and control transfer. In some implementations, the UE may be configured to autonomously activate or deactivate relay UEs based on the mobility of the UE, and report the activation or deactivation to the BS.

Abstract: New radio (NR) unlicensed (NR-U) operations are discussed with channel occupancy time (COT) multiple downlink-uplink switching opportunities supported by an active channel indication. A network node that initiates a COT for transmissions may identify a within-channel occupancy time (COT) scheduled downlink-uplink switching configuration. After beginning transmissions on the COT, the node receives an active channel indication from one or more additional network nodes. In response to the active channel indication, the node may then perform communications with the node from which the active channel indication is received according to the within-COT scheduled downlink-uplink switching configuration for the current COT on a shared communication channel.

Abstract: A medium reservation framework is disclosed for coexistence of coordinated and uncoordinated wireless networks in licensed spectrum and shared spectrum. The proposed medium reservation framework organically takes into account operating regimes with different numbers of Tx/Rx antennas per node, provides flexibility in trading off medium contention aggressiveness and power saving, leverages the inherent synchronization nature of NR, and covers both coordinated and uncoordinated operation scenarios. Various aspects of the medium reservation framework may be centered on one or more combinations of some basic building blocks, such as an operation grid, synchronization signals, and reservation messages, such as a reservation request signal (RRQ) and one or more a reservation response signals (RRS).