Abstract: The disclosure relates to a wireless communication system, in which a method performed by a user equipment includes receiving, from a base station, information configuring a plurality of sounding reference signal (SRS) resources that are related with one channel state information-reference signal (CSI-RS) resource, receiving an SRS resource indicator (SRI) indicating at least one SRS resource from among the plurality of SRS resources, obtaining, based on an implicit precoding being indicated for an uplink channel, precoding information for the uplink channel based on the CSI-RS resource related with a most recently transmitted SRS of the at least one SRS resource indicated by the SRI, and transmitting, to the base station, the uplink channel based on the precoding information.

Abstract: Methods and apparatuses for joint channel state information (CSI) measurement are described herein. A method may include receiving channel state information reference signals (CSI-RSs) from first and second transmit/receive points (TRPs), determining CSI, and selecting one of the TRPs as a primary TRP and a remaining one of the first TRP or the second TRP as a secondary TRP. The method may include reporting information indicating a first CSI for the primary TRP and receiving second CSI-RSs from the TRPs. The method may include determining a second CSI and a precoding matrix indicator (PMI) for the primary TRP, and determining channel coding information for the primary TRP. The method may include determining a second CSI for the secondary TRP, determining, based on channel coding information and the second CSI for the secondary TRP and a PMI for the secondary TRP, and reporting information indicating the PMI for the second TRP.

Abstract: Methods, apparatus and systems are disclosed. In one embodiment, a method may be implemented by a first Wireless Transmit/Receive Unit (WTRU). The method may include receiving configuration information indicating a first set of RBs for performing a CSI-RS measurement, receiving an indication indicating a second set of RBs, and receiving an indication indicating that a first set of symbols or slots is not configured for a certain type of duplexing method and a second set of symbols or slots is configured for the certain type of duplexing method. The method may also include measuring a first CSI-RS in the first set of RBs in a symbol or slot in the first set of symbols or slots, measuring a second CSI-RS in a symbol or slot of the second set of symbols or slots in RBs that are in both the first set of RBs and the second set of RBs. determining a CSI based on the measurement of the first CSI-RS and the second CSI-RS, and reporting the CSI.

Abstract: Disclosed is a method of transmitting a sounding reference signal (SRS) of a user equipment in a wireless communication system, including identifying an SRS transmission count based on an SRS periodicity, a number of SRS symbols, an SRS repetition factor, a system frame number, a number of slots per a frame for a subcarrier spacing, and a slot number within the frame for the subcarrier spacing, and transmitting, to a base station, the SRS based on the SRS transmission count.

Abstract: A method performed by a wireless transmit/receive unit (WTRU) may compromise: receiving a downlink control information, wherein the DCI includes a multi-PDSCH priority indication; determining a priority for each of a two or more PDSCHs transmissions based on the multi-PDSCH priority indication; determining one or more scheduling parameters for each of the two or more PDSCH transmissions based on the determined priority of each of the two or more PDSCH transmissions; and receiving each of the two or more PDSCH transmissions using the respective determined scheduling parameters. The method may further compromise associating a first scheduling parameter with a first priority and a second scheduling parameter with a second priority, wherein the first priority is a high priority and the second priority is a low priority.

Abstract: Method, apparatus, and systems for flexible aperiodic reference signal (RS) transmissions are provided. For example, a method implemented in a wireless transmit/receive unit (WTRU) for wireless communications comprises receiving configuration information of one or more sounding reference signal (SRS) resource sets, each SRS resource set of the one or more SRS resource sets is associated with a slot offset and a set of slot offset deltas; receiving downlink control information (DCI) indicating an SRS request, the SRS request indicates an SRS resource set of the one or more SRS resource sets; determining an SRS configuration from a set of SRS configurations for SRS transmissions; determining a slot for transmitting an SRS based on the determined SRS configuration; and transmitting, in the determined slot, the SRS using resources of the indicated SRS resource set.

Abstract: Beam management may be coordinated by a centralized coordinating entity, e.g., by a gNB, that configures and schedules Channel State Information Reference Signal, CSI-RS, transmissions for beam measurement and reporting. This centralized coordinating entity may not be available for Wireless Transmit-Receive Units, WTRUs, in a SideLink, SL, mode of operation, where resource allocation is performed by WTRUs in a distributed manner. WTRU procedures for establishing and updating an SL TCI state association are disclosed, including determining a spatial domain filter to use for an SL transmission. In these WTRU procedures, a WTRU may perform CSI-RS transmissions in an SL slot, e.g., multiplexed with a PSCCH/PSSCH transmission. The WTRU may receive, in reply, CSI reporting information comprising a spatial domain filter. For further SL TB transmissions for the SL, the WTRU may use the spatial domain filter.

Abstract: Procedures, methods, architectures, apparatuses, systems, devices, and computer program products may perform channel separation of transmissions associated with a reconfigurable intelligent surface (RIS). In an example, a wireless transmit/receive unit (WTRU) may determine a first channel matrix using measurements of a reference signal (RS) which is associated with first RIS parameter settings, which may impart first reflection properties at the RIS. The WTRU may determine a second channel matrix using measurements of a RS which are associated with second RIS parameter settings, which may impart different second reflection properties the RIS. The WTRU may derive a RIS channel matrix using a function of the first channel matrix and the second channel matrix and determine Channel state information (CSI) therefrom. The WTRU may feedback information indicating the CSI to a base station.

Abstract: Systems, methods, and instrumentalities are described herein regarding enhancements of physical channels in Multi-TRP. Reliability enhancements are provided for physical downlink control channel (PDCCH), including, for example, enhanced support for a control resource set (CORESET) combining. Reliability enhancements are provided for physical uplink control channel (PUCCH), including, for example, activation/deactivation of repetition combining, resource selection, etc. Reliability enhancements are provided for physical uplink shared channel (PUSCH), including, for example, spatial relation determination and signaling, configured and dynamic grant enhancements, etc.

Abstract: A method and apparatus for receiving synchronization signal block (SSB) at a WTRU is disclosed. The WTRU receives a candidate SSB in a set of symbols in a slot. Then the WTRU receives an indication of a mode of association between candidate SSB positions and candidate SSB index. Next the WTRU determines a candidate SSB index associated with the candidate SSB. Then the WTRU determines a symbol number of a symbol in the set of symbols and a slot number of the slot based on the candidate SSB index and the indicated mode of association. And, then the WTRU receives a PDCCH transmission using a timing determined based on the determined symbol number and slot number. In some embodiments, the indicated mode of association may be either a first mode or a second mode.

Abstract: Methods and apparatus for recovering from a beam failure in a non¬terrestrial communication network are provided. A method may include receiving (610) configuration information indicating a first set of RSs including one or more first RSs associated with a first BWP of a cell, and second sets of RSs that each include one or more second RSs associated with a second BWP. The method may include determining (620) a candidate set of RSs from the plurality of second sets of RSs based on any of a location and a timing advance value associated with the WTRU, selecting (630) an RS from the candidate set of RSs that have measured signal characteristics that satisfy a threshold, and transmitting (640) a PRACH transmission associated with the selected RS in the one of the one or more second BWPs associated with the selected RS during a period in which current operation with the first BWP is suspended.

Abstract: Procedures, methods, architectures, apparatuses, systems, devices, and computer program products are disclosed that may be implemented in a wireless transmit/receive unit (WTRU) that is in communication with a base station and/or an intelligent reflecting surface (IRS). For example, the WTRU may operate to facilitate selection of a first beam transmitted from the base station and reflected by the IRS and selection of a reflection parameter set which configures the IRS to reflect the first beam in a manner which may enhance reception of the first beam at the WTRU. As another example, the WTRU may operate to facilitate selection of a beam pair which may include a first beam transmitted from the base station and a second beam transmitted from the base station and reflected by the IRS to the WTRU. The WTRU may receive a configuration which associates particular beams with particular reference signal resources.

Abstract: Methods, apparatuses, systems, etc. directed to beam management for, and/or for use in connection with, multiple cells and/or multiple transmission/reception points are provided. Among the methods is a method that may include any of determining first and second reference signals sets (RS sets) associated with first and second sets of beams; receiving information for first and second beam failure recovery (BFR) sets corresponding to the first and second RS sets, wherein the information indicates an RS set associated with candidate beams (CB-RS set) and an uplink resource set for each of the first and second BFR sets; determining beam failures based on the first and second RS sets; selecting the CB-RS set and UL resource set from the first or second BFR set; determining an RS of the selected CB-RS set; and transmitting information indicating the beam failures using uplink resources of the selected uplink resource set.

Abstract: Systems, methods, and instrumentalities are disclosed herein associated with supporting flexible (e.g., subband-wise) slot format indications, which may include slot type(s) (e.g., new slot type(s)) of ‘Mn’ as a “Mixed” DL/UL. Tx/Rx rules for periodic/semi-persistent configurations according to a subband-wise slot type for XDD may be provided. A search space may be associated with multiple CORESETs. In examples, a WTRU may determine which CORESET to use for monitoring the search space based on the slot type (e.g., XDD slot or non-XDD slot). A WTRU may determine to monitor a search space in an XDD slot based on the “Mn” types and/or the number of search space resources re-allocated for the uplink in the slot. One or more search space sets may be configured and which search space set to monitor may be determined based on the slot type.

Abstract: Methods, apparatuses, systems, etc. directed to beam management for, and/or for use in connection with, multiple cells and/or multiple transmission/reception points are provided. Among the methods is a method that may include any of determining first and second reference signals sets (RS sets) associated with first and second sets of beams; receiving information for first and second beam failure recovery (BFR) sets corresponding to the first and second RS sets, wherein the information indicates an RS set associated with candidate beams (CB-RS set) and an uplink resource set for each of the first and second BFR sets; determining beam failures based on the first and second RS sets; selecting the CB-RS set and UL resource set from the first or second BFR set; determining an RS of the selected CB-RS set; and transmitting information indicating the beam failures using uplink resources of the selected uplink resource set.

Abstract: System(s), method(s), and device(s) for simultaneous transmission and reception is disclosed here. A wireless transmit receive unit (WTRU) may have multiple antenna panels which may be capable of different modes of operation, such as simultaneous DL/DL (S-DD), simultaneous UL/UL (S-UU) and simultaneous DL/UL (S-DU). Further, the WTRU may use each panel independently to communicate with multiple transmission and receive points simultaneously. The WTRU may accomplish this using transmission control indicators, reference signals, monitoring techniques suitable for multiple transmission and reception point communication.

Abstract: Methods and devices to extend the Channel Occupancy Time (COT) for LBT-free PRACH transmission across consecutive ROs based on blind detection are disclosed. Methods and devices to extend the COT for LBT-free PRACH transmission in case of one or more unused ROs across the consecutive ROs based on dynamic indication from gNB are disclosed. Methods and devices to determine the mode of operation based on the cover-codes are disclosed. Method and devices to support the PRACH transmission from a WTRU in multiple consecutive ROs are disclosed.

Abstract: Method, apparatus, and systems for flexible aperiodic reference signal (RS) transmissions are provided. For example, a method implemented in a wireless transmit/receive unit (WTRU) for wireless communications comprises receiving configuration information of one or more sounding reference signal (SRS) resource sets, each SRS resource set of the one or more SRS resource sets is associated with a slot offset and a set of slot offset deltas; receiving downlink control information (DCI) indicating an SRS request, the SRS request indicates an SRS resource set of the one or more SRS resource sets; determining an SRS configuration from a set of SRS configurations for SRS transmissions; determining a slot for transmitting an SRS based on the determined SRS configuration; and transmitting, in the determined slot, the SRS using resources of the indicated SRS resource set.

Abstract: System(s), method(s), and device(s) for simultaneous transmission and reception is disclosed here. A wireless transmit receive unit (WTRU) may have multiple antenna panels which may be capable of different modes of operation, such as simultaneous DL/DL (S-DD), simultaneous UL/UL (S-UU) and simultaneous DL/UL (S-DU). Further, the WTRU may use each panel independently to communicate with multiple transmission and receive points simultaneously. The WTRU may accomplish this using transmission control indicators, reference signals, monitoring techniques suitable for multiple transmission and reception point communication.

Abstract: Systems, methods, and instrumentalities are described herein regarding enhancements of physical channels in Multi-TRP. Reliability enhancements are provided for physical downlink control channel (PDCCH), including, for example, enhanced support for a control resource set (CORESET) combining. Reliability enhancements are provided for physical uplink control channel (PUCCH), including, for example, activation/deactivation of repetition combining, resource selection, etc. Reliability enhancements are provided for physical uplink shared channel (PUSCH), including, for example, spatial relation determination and signaling, configured and dynamic grant enhancements, etc.