Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may select, for a configured cell set that includes multiple transmit-receive point (TRP) groups, a TRP group modification associated with a cell group of the configured cell set. The network node may transmit the TRP group modification in at least one of layer 1 signaling or layer 2 signaling. Numerous other aspects are described.

Abstract: A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE receives a configuration of a set of cells configured for layer 1 (L1) or layer 2 (L2) inter-cell mobility. The UE further transmits a special cell (SpCell) update message in response to an SpCell change condition on the first SpCell in the set of cells for the L1 or L2 inter-cell mobility. The SpCell change condition may include a beam failure on the first SpCell. The method improves the quality of service, beam reliability, and resource utilization of wireless communication, and reduces latency and power consumption of wireless communication.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support multi-path user equipment (UE) uplink communication techniques with UE cooperation. In a first aspect, a UE configured for wireless communication includes determining activation of a multipath transmission configuration at the UE. The UE identifies one or more uplink communication messages for transmission to the serving network entity and transmits the uplink communication messages according to the multipath transmission configuration. Other aspects and features are also claimed and described with respect to cooperative UEs and network entities.

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 in which sidelink communications between devices may be retransmitted using one or more nodes. A first user equipment (UE) may transmit a broadcast, multicast, or groupcast communication to a set of other UEs using sidelink resources. A node may monitor the communications and store the first UE transmission. UEs of the set of other UEs may transmit feedback reports to the node that indicate one or more missing packets of the first UE transmission. The node may retransmit one or more of the stored packets to the set of other UEs based on the feedback reports. In some cases, the sidelink communications may be encoded using a network coding algorithm, and the node may retransmit network coded packets based on the feedback reports, may transmit newly encoded packets based on the feedback reports, or combinations thereof.

Abstract: Methods, systems, and devices for wireless communications are described. Generally, a transmitting device may support receiver-specific network coding redundancy techniques. For example, a transmitting device may select a receiver-specific redundancy configuration for transmission to a particular receiver based on a quality of a link between the transmitting device and the receiving device. The transmitting device may select or calculate a user-specific redundancy for the link based on a received packet loss probability report, or may select the preferred redundancy configuration as indicated in a request received from the receiving device, or may network encode and transmit one or more initial transmissions according to a default redundancy configuration and increment or decrement the default redundancy based on feedback from the receiving device.

Abstract: Techniques related to user equipment triggered layer 1 measurements for inter-cell mobility are disclosed. Some aspects of the disclosure relate to devices and methods for determining, at a user equipment, that a first condition is triggered for performing one or more layer 1 signal measurements for inter-cell mobility, performing the one or more L1 signal measurements of one or more cells in a configured cell set for the user equipment based on determining that the first condition is triggered, and sending a report of the one or more L1 signal measurements to a network node.

Abstract: A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE receives from a network entity a configuration for layer 1 (L1) or layer 2 (L2) mobility cell for a set of cells that are able to be activated or deactivated for data or control transmission using L1 or L2 signaling. The configuration includes at least one cell that supports L1 or L2 activation as a special cell (SpCell). The UE further receives from the network entity L1 or L2 signaling for one or more configured cells or one or more configured groups of cells in the set of cells carrying information about activation, deactivation, or update of the SpCell, or update of a group of cells with SpCell, and communicates via one or more activated cells in the set of cells based on the L1 or L2 signaling.

Abstract: Apparatus, methods, and computer program products for wireless communication are provided. An example method may include receiving, from a second network entity in RRC signaling, a set of mobility configurations, wherein each configuration of the set mobility configurations is associated with a respective cell of a mobility configured cell set, and wherein the set of mobility configurations comprises PCell configurations, wherein each PCell configuration of the PCell configurations corresponds to a respective cell in the mobility configured cell set. The example method may further include receiving, from the second network entity in DCI or a MAC-CE, mobility deconfiguration information configured to cause release of at least one subset of cells from the mobility configured cell set. The example method may further include releasing, based on the mobility deconfiguration information, the at least one subset of cells from the mobility configured cell set.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a first control message indicating a set of mobility parameters associated with a lower layer handover procedure, which may be a layer 1 (L1)/layer 2 (L2) handover procedure. The UE may receive a second control message indicating a first or second reset procedure, which may each indicate a respective set of operating parameters for a higher layer than L1/L2 in the protocol stack. The UE may perform the lower layover handover procedure, which may include switching from a first serving cell to a second serving cell. The UE may perform the first or second reset procedure based on the switching, where the first reset procedure may include maintaining the operating parameters of the second serving cell, and the second reset procedure may include switching the operating parameters of the second serving cell.

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 a method of wireless communication at a user equipment (UE), generally including receiving a configuration indicating a set of cells that are configured for serving the UE and support mobility signaling via physical (PHY) layer or medium access control (MAC) layer signaling; receiving signaling that indicates a group of cells for the UE to remove from the set of cells; and releasing the indicated group from the set of cells.

Abstract: Methods, systems, and devices for wireless communications are described. A network node may transmit, to a plurality of user equipment (UE), a set of network encoded packets generated using a set of packets. A UE of the plurality of UEs may receive a subset of the set of encoded packets and may decode the subset to determine a first set of decoded packets. The UE may receive a second set of decoded packets from the plurality of UEs. The UE may transmit feedback to the network node that indicates the successfully decoded packets of the first and second sets. The network node may receive the feedback and may determine a subset of the set of packets that was successfully decoded for each UE providing the feedback. The network node may transmit an updated set of network encoded packets to the plurality of UEs.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit capability information indicating a capability relating to Layer 1 or Layer 2 (L1/L2) mobility using a configured cell set and an activated cell set. The UE may communicate in accordance with the capability information. Numerous other aspects are described.

Abstract: Methods, systems, and devices for updating timing advance values for deactivated cells are described. A user equipment (UE) may transmit, to a first cell that is deactivated, a random access message for a timing advance probing procedure. The UE may transmit the random access message to the first cell. In some examples, the UE may receive, from a second cell, an activation command that activates the first cell and an indication of a timing advance value for the first cell generated based on the random access message. In other examples, the UE may monitor for a random access response (RAR) message from the first cell, the RAR message including an activation command that activates the first cell and an indication of a timing advance value generated based on the random access message. The UE may communicate with the first cell based on the activation command and the timing advance value.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicate with a network entity using one or more directional beams. The UE may detect a beam failure associated with at least one of the one or more directional beams, and the UE may calculate a duration between a detected beam failure and a subsequent random access occasion. The UE may transmit a beam failure recovery (BFR) message indicating the detected beam failure to the network entity or to a second UE based on whether the calculated duration satisfies a threshold duration. For example, the UE may transmit the BFR message to the second UE when the calculated duration is greater than or equal to the threshold duration. Alternatively, the UE may transmit the BFR message to the network entity when the calculated duration is less than the threshold duration.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a primary cell (PCell), a radio resource control (RRC) message that indicates an inter-cell mobility cell set and a measurement configuration. The UE may transmit, to the PCell, a measurement report that indicates one or more measurements of one or more cells indicated in the inter-cell mobility cell set, wherein the one or more measurements are derived based at least in part on the measurement configuration. The UE may receive, from the PCell, a joint cell activation and timing advance command medium access control control element (MAC-CE), wherein the joint cell activation and timing advance command MAC-CE indicates an activation of a new cell, of the one or more cells, and timing advance information associated with the new cell. Numerous other aspects are described.

Abstract: A method of wireless communication at a UE is disclosed herein. The method includes transmitting, at a first time instance, an indication of a first measurement on at least one DL-RS associated with a first cell, where the first cell is included in a L1 mobility configured cell set or a L2 mobility configured cell set. The method includes receiving, at a second time instance after the first time instance, an estimated TA associated with the first cell. The method includes performing a second measurement on the at least one DL-RS. The method includes accepting or rejecting the estimated TA for communication with the first cell based on at least one of the first measurement or the second measurement.

Abstract: A method of wireless communication at a UE is disclosed herein. The method includes receiving a L1 mobility cell configuration or a L2 mobility cell configuration for a set of cell groups, where each cell group in the set of cell groups includes a plurality of cells, where a first cell group in the set of cell groups is associated with a pTAG and a second cell group in the set of cell groups is associated with a sTAG, where the pTAG is associated with a first TA and the sTAG is associated with a second TA. The method further includes receiving L1 signaling or L2 signaling that associates the second cell group with the pTAG and the first cell group with the sTAG.

Abstract: An apparatus for wireless communication at a UE is provided. The apparatus is configured to receive a layer 1 (L1) or layer 2 (L2) mobility cell configuration for a set of cells for L1 or L2 inter-cell mobility. The set of cells include multiple cells, and each cell in the set of cells is able to be activated or deactivated for data and/or control transfer using L1 or L2 signaling. The apparatus is further configured to receive L1 or L2 signaling indicating multiple activated cells, and activate one or more cells in the multiple activated cells in the priority order for the data and/or control transfer using L1 or L2 signaling. The apparatus provides configuration, cell activation or deactivation in an optimized order, and associated signaling to enable L1/L2 mobility for more efficient and robust mobility management.