Abstract: In an embodiment, a method implemented in a WTRU is described. In an example, the method may include receiving configuration information indicating a remaining time threshold to be used for triggering transmission of a report related to a logical channel group (LCG). The method may include determining that a remaining time for a transmission of one or more PDUs associated with the LCG is below the remaining time threshold. The method may include transmitting the report related to the LCG in a MAC control element (MAC CE) based on at least the remaining time being below the remaining time threshold. In various embodiments, the report may include an indication of (i) the remaining time associated with the LCG and (ii) an amount of data associated with the LCG.

Abstract: There may be one or more systems, methods, and/or devices that address a relay wireless communication scenario. For example, in such a scenario, there may be at least three entities, a remote a wireless transmit receive unit (WTRU) may need to communicate with a network node (e.g., gNB) and/or another WTRU that it cannot directly communicate with. This remote WTRU may communicate with a relay WTRU in order to communicate with the ultimate destination (e.g., another WTRU or a network node). The use of a relay may require establishment and configuration of one or more entities involved.

Abstract: Methods and apparatuses are described herein for monitoring radio links between wireless transmit/receive units (WTRUs) and determining of radio link failure, and may be used, among others, for New Radio (NR) vehicular communication (V2X); a mode whereby WTRUs can communicate with each other directly. A radio link between a WTRU and another WTRU may be monitored independently per ongoing unicast and/or multicast link, and radio link failure (RLF) may be determined as a function of the monitoring.

Abstract: Methods, apparatus, systems, architectures, and interfaces for a wireless transmit receive unit (WTRU) performing sidelink communications are provided.

Abstract: A SL wireless transmit/receive unit (WTRU), configured in mode 1, with SL transmissions on unlicensed spectrum, may receive a SL grant from a gNodeB (gNB) and determine whether the SL grant falls within a COT initiated by another WTRU, based on COT structure information received from SCI transmissions of other WTRUs. If the SL grant falls within the COT initiated by another WTRU, the WTRU may perform a first LBT type to try to share the COT. If the SL grant does not fall within the COT initiated by another WTRU, the WTRU may perform a second LBT type to try to initiate its own COT. If LBT fails for the grant, the WTRU may report a failed LBT to the gNB in UCI.

Abstract: The disclosure pertains to methods and apparatus using V2X enhancements to perform discontinuous reception. In an embodiment, a method implemented by a first WTRU, for a device-to-device (D2D) communication between the first WTRU and a second WTRU, the method may include any of comprising receiving, from the second WTRU, D2D control information comprising: (1) first information indicating one or more first transmission resources reserved for transmission of the D2D communication and (2) second information indicating if at least one second transmission resource is reserved for retransmission of the D2D communication; determining a sleeping period for the first WTRU that ends prior to a reception time of the retransmission of the D2D communication, wherein the sleeping period is based on the second information; and receiving the retransmission of the D2D communication, after an end of the determined sleeping period.

Abstract: Systems, methods, and instrumentalities are described herein that may be used to determine a destination for sidelink transmission based on the priority of the transmission and/or other parameters associated with the transmission. In examples, a destination may be selected if one or more logical channels associated with the destination have a bucket size parameter exceeding a certain threshold and the one or more logical channels have a highest priority. Various other techniques are also described herein that relate to the configuration and/or report of QoS information, selection of sidelink resources, use of a minimum communication range, etc.

Abstract: An apparatus may be configured to determine whether to prioritize a sidelink (SL) logical channel group (LCG) based on an SL prioritization threshold and a UL prioritization threshold, on a condition that a UL prioritization threshold is configured. The apparatus may be configured to determine whether a prioritization value associated with the SL LCG is lower than the SL prioritization threshold. The apparatus may be configured to determine (e.g., at least) whether an uplink (UL) LCG has a prioritization value that is equal to or higher than the UL prioritization threshold. The apparatus may be configured to determine whether to prioritize SL buffer status reporting (BSR) based on a size of a UL grant and the determination of whether to prioritize the SL LCG. The apparatus may be configured to report a buffer status based on the determination of whether to prioritize the SL BSR.

Abstract: A sidelink (SL) wireless transmit and receive unit (WTRU) may be configured establish a unicast link with a peer WTRU allowing use of a plurality of SL carriers and transmits data, on at least a first SL carrier to the peer WTRU. The WTRU determines a carrier-specific SL radio link failure (RLF) of the first SL carrier based on a number of detected consecutive hybrid automatic repeat request (HARQ) discontinuous transmissions (DTXs) exceeding a threshold HARQ DTX count and performs a SL carrier reselection procedure to select a second SL carrier, excluding SL carriers determined with carrier-specific SL RLF. The WTRU transmits, to the peer WTRU on one of the plurality of SL carriers without carrier-specific SL RLF, an indication of the carrier-specific RLF of the first SL carrier. If no SL available SL carrier remains, the WTRU releases the unicast link with the peer WTRU. Additional embodiments are disclosed.

Abstract: Methods and apparatuses are described herein for monitoring radio links between wireless transmit/receive units (WTRUs) and determining of radio link failure, and may be used, among others, for New Radio (NR) vehicular communication (V2X); a mode whereby WTRUs can communicate with each other directly. A radio link between a WTRU and another WTRU may be monitored independently per ongoing unicast and/or multicast link, and radio link failure (RLF) may be determined as a function of the monitoring.

Abstract: Methods and corresponding apparatuses are provided herewith for determining whether a relay wireless transmit/receive unit, WTRU, may serve a network initiated connection at a remote WTRU based on the coverage status of the remote WTRU, on a Channel Busy Ratio, CBR, and on access control decision made by the network. The methods may comprise receiving an In-Coverage, IC, indication from the remote WTRU, indicating that the remote WTRU is IC of a suitable cell; receiving a paging message intended for a remote WTRU of a set of remote WTRUs handled by the relay WTRU; and on condition that the CBR is above a threshold, forwarding the paging message on Sidelink and indicating to the remote WTRU to trigger a Radio Resource Control, RRC, connection via Uu.

Abstract: As disclosed herein, there is one or more system, device, and/or method that addresses one or more of the following, but is not limited to: wireless transmit receive unit (WTRU)(s) configured to send sidelink radio link measurements to a base station (e.g., gNB); WTRU(s) configured to consider CBR/CR levels for starting performing measurements on neighbor links/cells; WTRU(s) configured to consider CBR/CR levels in conjunction with SL RSRP/RSRQ/RSNI thresholds for reporting measurements; WTRU(s) configured to report sidelink measurements in different ways depending on the measurements being performed using data or discovery signals; relay WTRU(s) configured to forward/report sidelink measurements to a gNB; handover commands in a relay scenario based on measurements at a remote WTRU.

Abstract: A method performed by a relay wireless transmit/receive unit (WTRU) includes receiving an indication of a change in state of a remote WTRU having a paging link with the relay WTRU, receiving a paging message from a network. The paging message includes a system information (SI) change indication, wherein the SI change indication indicates an availability of updated SI information from the network for the remote WTRU. The relay WTRU transmits the updated SI information to the remote WTRU based on the received indication of a change in state of the remote WTRU.

Abstract: A first wireless transmit/receive unit (WTRU) may receive, from a second WTRU, sidelink control information (SCI), including first information indicating if a resource is reserved by the second WTRU, and second information indicating if the second WTRU is a power saving or non-power saving. The first WTRU may measure a reference signal receive power (RSRP) of signals transmitted by the second WTRU. The first WTRU may add a resource to a set of available resources if the first information indicates that the resource is not reserved by the second WTRU. If a resource is reserved, the WTRU may set an RSRP threshold to a first set or second threshold based on a power saving mode of the second WTRU. The first WTRU may add the resource to the set of available resources if the measured RSRP is less than the selected RSRP threshold.

Abstract: Methods, apparatus, systems, architectures, and interfaces for a wireless transmit receive unit (WTRU) performing sidelink communications are provided.

Abstract: In an embodiment, a method implemented in a WTRU is described. In an example, the method may include receiving configuration information indicating a remaining time threshold to be used for triggering transmission of a report related to a logical channel group (LCG). The method may include determining that a remaining time for a transmission of one or more PDUs associated with the LCG is below the remaining time threshold. The method may include transmitting the report related to the LCG in a MAC control element (MAC CE) based on at least the remaining time being below the remaining time threshold. In various embodiments, the report may include an indication of (i) the remaining time associated with the LCG and (ii) an amount of data associated with the LCG.

Abstract: Methods and apparatuses for Sidelink (SL) communication are disclosed herein. A method for SL communication performed by a Wireless Transmit/Receive Unit (WTRU) may include receiving a plurality of resources over a Physical Sidelink Control Channel (PSCCH) in a slot. In addition, the method may include determining the plurality of resources in the slot are control information resources and determining a control information resource type associated with the control information resources. The method may include determining a priority of the control information resource type based on a configuration relating priorities to control resource information types. The method may also include determining a Quality of Service (QoS) of the transport block (TB) associated with the control information resource type. Moreover, the method may include decoding the PSCCH according to the determined priority of the control information resource type.

Abstract: Systems, methods, and instrumentalities are disclosed for a WTRU to act as a mobile relay, the method comprising the WTRU connecting to the network, the WTRU receiving a message from the network indicating that the WTRU is to act as a mobile relay for one or more devices outside of the coverage of the network, the WTRU discovering one or more devices outside of the coverage of the network, and the WTRU receiving a message from the out-of-coverage device that indicates that the out-of-coverage device has selected the WTRU to act as a mobile relay.

Abstract: A method for determining a DRX operation in a wireless transmit receive unit (WTRU) that has information indicating multiple DRX configurations, includes selecting a first DRX configuration from the multiple DRX configurations based on a first cast type and an associated first quality of service (QOS) information for a first sidelink radio bearer (SLRB) configuration, selecting a second DRX configuration from the multiple DRX configurations based on a second cast type and an associated second QoS information for a second SLRB configuration, determining a sidelink monitoring time based on a combination of an active time associated with the first DRX configuration and an active time associated with the second DRX configuration, and monitoring a sidelink control channel using the determined sidelink monitoring time.

Abstract: A wireless transmit/receive unit (WTRU) may receive a first scheduling assignment that includes an indication of one or more first resources and an indication of a first priority for a first sidelink data transmission from another WTRU. The first WTRU may determine to send a second sidelink data transmission associated with a second priority that is lower than the first priority. The first WTRU may determine a signal strength associated with the first scheduling assignment and may select one or more resources for sending the second sidelink data transmission. The first WTRU may determine that one or more first resources are available for transmission of the second sidelink data transmission based on the signal strength associated with the first scheduling assignment being below a threshold. The first WTRU may send a second scheduling assignment including an indication of the selected one or more resources for the second sidelink data transmission.