Abstract: Methods, systems, and devices for wireless communications are described. A network node may identify a set of packets for broadcasting to a set of user equipment (UEs) and may transmit a set of encoded packets based on the set of packets. The network node may receive feedback from one or more of the UEs, and the feedback may indicate a number of successfully received packets of the set of encoded packets at each of the one or more UEs. Based on the feedback, the network node may transmit a second set of encoded packets to the set of UEs if the number of successfully received packets for at least one UE fails to satisfy a decodability threshold. The transmitter may continue to transmit sets of encoded packets until the feedback indicates that each UE has received a number of packets that satisfies the decodability threshold.

Abstract: A UE may receive a BFD-RS and calculate, based on the BFD-RS, one or more of a value of an RSSI or at least one of a value of an SNR or a value of an RSRP, such that the UE may report a BFI based on the calculated values. The UE may initiate at least one of a total BFI timer or a consecutive BFI timer when a first BFI of a plurality of BFIs is stored, and increment at least one of a total BFI counter or a consecutive BFI counter when each of the plurality of BFIs is stored. A BFD procedure may be performed if at least one of the total BFI counter is greater than or equal to a maximum total count or the consecutive BFI counter is greater than or equal to a maximum consecutive count prior to an expiration of respective BFI timers.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter user equipment (UE) may obtain timing information that indicates an expiration time for transmitting a plurality of packets to a receiver UE. The transmitter UE may transmit a sidelink communication to the receiver UE, in accordance with the timing information, that includes at least one packet of the plurality of packets. Numerous other aspects are described.

Abstract: A user equipment may be configured to perform beam failure detection enhancement. In some aspects, the user equipment may receive a beam failure detection reference signal (BFD-RS) from a base station, detect an occurrence of an interference event based on a first measurement of the BFD-RS or a channel event based on a second measurement of the BFD-RS, and update count information based on a detection function and the occurrence. Further, the user equipment may determine that at least one of a first timer for interference events or a second timer for channel events is active, and determine whether to perform a beam failure recovery process based on comparing a total count of the count information to a predefined threshold value.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may use the techniques described herein to efficiently detect beam failure. In one aspect, the UE may autonomously select one or more criteria for detecting beam failure. The UE may then perform measurements on beam failure detection reference signals received from the base station and use the selected one or more criteria to detect beam failure. Because the UE may select the one or more criteria without signaling from the base station, control overhead between the UE and the base station may be reduced.

Abstract: Methods, systems, and devices for wireless communications are described. A base station and user equipment (UE) may support network coded communications on a sidelink connection. The base station may configure UEs with network coding configurations. The network coding configuration may include one or more sets of network coding parameters. The base station may configure a first UE to send network coded information on the sidelink to a second UE. The network coded information may be generated based on data packets which were unsuccessfully decoded by the second UE. By transmitting network coded information on a sidelink, the second UE may efficiently obtain data packets which were unsuccessfully decoded from the base station.

Abstract: A base station may transmit, to a UE, a configuration set associated with a BFD-RS set corresponding to a plurality of beams including a first beam via an RRC message. The base station may transmit, to the UE, a BFD-RS associated with the first beam. The BFD-RS may be associated with the BFD-RS set. The UE may detect a BFI indication of the first beam based on the BFD-RS from the base station. The UE may increment a BFI counter in response to the detected BFI indication of the first beam irrespective of a status associated with other beams in the plurality of beams. The UE and the base station may perform a BFR procedure in response to the BFI counter reaching or exceeding a corresponding BFI counter threshold.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured to generate a set of data packets that are to be transmitted to a base station, where each data packet of the set of data packets is associated with a respective packet expiration time. The UE may transmit an indication of packet expiration information associated with the set of data packets, where the packet expiration information is based on a set of packet expiration times associated with the set of data packets. The UE may receive, from the base station, scheduling information associated with at least a subset of the set of data packets, where the scheduling information is based on the packet expiration information. The UE may then transmit at least one data packet of the subset data packets to the base station in accordance with the scheduling information.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive and decode a network-coded message over a sidelink channel from a second UE, the network-coded message encoded using a rateless encoding algorithm. The first UE may report redundancy feedback information to the second UE for the network-coded message. Based on the feedback information, the second UE may adjust an amount of redundancy used to encode future messages to the first UE that are encoded using the rateless encoding algorithm.

Abstract: Certain aspects of the present disclosure provide techniques for beam failure detection per beam. A method that may be performed by a user equipment (UE) includes communicating with a network entity via a plurality of beams associated with a cell; performing a beam failure detection procedure per beam of the plurality of beams; and triggering a beam failure recovery procedure for a first beam of the plurality of beams in response to detecting a first beam failure for the first beam.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for techniques for beam failure detection and recovery. A UE may support autonomous determination of a beam failure timer for a beam failure procedure, such as a beam failure detection (BFD) timer for a BFD procedure or a beam failure recovery (BFR) timer for a BFR procedure. For example, a network entity may transmit reference signals to the UE that are associated with the beam failure procedure. For instance, the UE may measure the reference signals as part of a BFD procedure or may initiate a BFR procedure in response to receiving the reference signals. The UE may determine a timer value for the beam failure timer using, for example, a machine learning (ML) model or a mapping and may perform the beam failure procedure in accordance with the UE-determined beam failure timer.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for signaling mechanisms associated with reporting information associated with multiple beam failure indicator (BFI) types via a beam failure detection (BFD) report. In some aspects, a user equipment (UE) may measure a periodic reference signal as part of a BFD procedure and may report a BFI if the UE measures that the reference signal fails to satisfy a threshold signal strength or quality. The UE may further detect or classify each reported BFI as one of multiple BFI types and may store information associated with respective numbers of the multiple BFI types in accordance with the detection or classification. In scenarios in which the UE declares beam failure, the UE may transmit a BFD report including the information associated with the respective numbers of the multipole BFI types.

Abstract: Certain aspects of the present disclosure provide techniques for enhancing beam failure indications and detections. In particular, the present disclosure provides techniques for identifying and indicating reasons associated with beam failures. For example, in aspects, a user equipment (UE) may evaluate multiple beam failure indicator (BFI) trigger conditions based on beam failure detection (BFD) reference signal (RS) measurements. The UE logs different types of BFIs based on the evaluating. If a logged number of BFIs exceeds a threshold value within a measurement period, the UE declares a beam failure and transmits, to a network entity, an indication of the beam failure and a reason for the beam failure based on the different types of BFIs detected.

Abstract: A user equipment (UE) may perform a beam failure procedure per beam of multiple beams and transmit, to a base station, a partial beam failure (BF) report. The base station may transmit, to the UE, a configuration of the partial BF report, and the UE may generate and transmit the partial BF report for the base station to perform the beam management. The parameters of the aperiodic partial BF report may be configured with the same or different parameters for each beam. The partial BF report may include at least one of a current beam failure indication (BFI) count or a channel measurement for each beam. The partial BF report may be transmitted periodically or aperiodically.

Abstract: Methods, systems, and devices for wireless communications are described. A base station may identify one or more user equipments (UEs) subscribed to receive broadcast transmissions. The base station may determine a first subset of the UEs is to receive broadcast transmissions via a direct link and a second subset of the UEs is to receive the packets from the broadcast transmission via a sidelink connection based on selection criteria. The base station may transmit an indication that the broadcast transmissions are to be received via either the direct link or sidelink connection to at least one of the first subset of UEs or the second subset of UEs. The base station may transmit the broadcast transmissions to the first subset of UEs via direct links, and the first subset of UEs may transmit the broadcast transmissions to one or more other UEs via sidelink connections.

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may receive a periodic reference signal from a base station and may measure the periodic reference signal as part of a beam failure detection (BFD) procedure. To detect a beam failure, the UE may autonomously select a beam failure indicator (BFI) counting scheme from a set of BFI counting schemes and may increment a BFI count in accordance with the selected BFI counting scheme and based on measuring the reference signal. The different BFI counting schemes of the set of BFI counting schemes may feature different techniques or methods for incrementing the BFI count per one or more BFI reports. As such, the UE may selectively choose how to weight different sets of one or more BFI reports in terms of contribution to the BFI count, which may improve BFD detection at the UE.

Abstract: This disclosure provides systems, methods and apparatuses for supporting network transmissions using unicast sidelink communications. A base station (BS) may transmit a set of encoded packets to a number of user equipment (UEs) and receive feedback messages from the UEs that indicate sets of decoded packets. Based on the feedback messages, the BS may transmit an updated set of encoded packets based on a difference between the set of encoded packets and the union of decoded packets. The BS may transmit an instruction to a first UE to transmit a broadcast sidelink communication that includes a set of missed packets that includes one or more decoded packets that were decoded by the first UE but were not decoded by the second UE. The first UE may transmit the broadcast sidelink communication to the second UE.

Abstract: Methods, systems, and devices for wireless communications are described. Generally, a transmitting user equipment (UE) may send packets, via a sidelink channel, to a receiving UE based on a network coding configuration received from a base station. The receiving UE may decode the packet(s) according to the network coding configuration, and transmit information that indicates an efficiency of the network coding configuration for the sidelink channel to the base station and/or the transmitting UE. The base station may generate and transmit, to the receiving UE and the transmitting UE, one or more updated parameters for the network coding configuration based on the received information that indicates the efficiency of the network coding configuration for the sidelink channel. The transmitting UE may encode, and the receiving UE may decode, future sidelink packets based on the one or more updated parameters.

Abstract: Methods, systems, and devices for wireless communications are described for detection of beam failure and beam failure recovery. A user equipment (UE) may perform measurements on one or more reference signals for one or more beams. In the event that one of the beams has a measurement that indicates a potential beam failure, the UE may increment a beam failure count (BFC) at a physical layer of the UE, and start a BFC timer. In the event that the BFC reaches a threshold value prior to expiration of the BFC timer, the UE may trigger a switch to a different active beam, provide a beam failure indication (BFI) to a higher layer of the UE, or both. A higher layer at the UE may autonomously adjust a BFI threshold for a number of BFIs that are needed to trigger a beam failure declaration to the base station.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, control signaling indicating an activation of a beam failure detection (BFD) procedure for detecting beam failure on a per-beam basis for a set of beams. The UE may receive control signaling indicating BFD parameters for each beam to use in accordance with the BFD procedure. The UE may monitor for a set of reference signals via the set of beams and maintain, at a medium access control (MAC) layer, a separate beam failure indication (BFI) counter and a BFD timer for each beam. The MAC layer may receive the BFIs from a physical layer at the UE such that if the BFI counter for a beam satisfies a configured BFI threshold count before a configured BFD timing duration, the UE may transmit a beam failure recovery request to the base station for the beam.