Abstract: A method performed by a wireless transmit/receive unit (WTRU) includes receiving a cell discontinuous transmission (cell-DTX) configuration including active and inactive durations for the received cell-DTX configuration, receiving a first, a second, and a third connected WTRU DRX (C-DRX) cycle configurations, including an ON duration, periodicity, and start offset, and receiving signaling indicating that the cell-DTX configuration is activated in a serving cell of the WTRU. Thereafter, activating the third C-DRX cycle configuration associated with the activated cell-DTX configuration based on the signaling that the cell-DTX configuration is activated.

Abstract: A WTRU may be configured to receive a bearer configuration information. For example, the bearer configuration information may comprise at least one of: a configuration for a first bearer that is associated with a direct path, a configuration for a second bearer that is associated with an indirect path, and/or a configuration for a third bearer that is associated with the direct path and the indirect path. Each of the bearers may be associated with a priority. The WTRU may receive data at one of the second bearer or the third bearer. The WTRU may generate a flexible BSR MAC CE that includes an indication of the LCG and the buffer size. If the data is received at the second bearer, the LCG may be the second bearer's LCG identifier. If the data is received at the third bearer, the LCG may be the third bearer's LCG identifier.

Abstract: A wireless transmit/receive unit (WTRU) may determine that data associated with a RB is to be transmitted. For example, the RB may be capable of being used to transmit, via a sidelink (SL), an uplink (UL), or a combination of the SL and the UL, the data associated with the RB. The WTRU may determine whether a first triggering condition associated with an SL resource allocation for the data is satisfied. The first triggering condition may be that the WTRU has not received, before a delay time duration ends, one or more resource grants that allocate sufficient resources for the data. If the WTRU determines that a first triggering condition is satisfied, the WTRU may perform the SL resource allocation for the data associated with the RB. The WTRU may determine an SL resource to transmit the data, for example, by performing the SL resource allocation.

Abstract: Among the procedures, methods, architectures, apparatuses, systems, devices, and computer program products disclosed herein for multipath relaying isa wireless transmit/receive unit (WTRU) configured to: receive, from a network node, configuration information for configuring, by the WTRU, a multipath connection, the multipath connection comprising a direct path via a first link with the network node and an indirect path via a second link, the second link being a sidelink associated with a sidelink relay WTRU; receive, from the network node, first system information on a first serving cell, the first serving cell being associated with the direct path; receive, from the network node, a message to release the direct path; perform a serving cell change from the first serving cell to a second serving cell, the second serving cell being associated with the indirect path; and receive, from the sidelink relay WTRU, second system information of the second serving cell.

Abstract: A wireless transmit/receive unit (WTRU) may transmit data associated with a protocol data unit (PDU). The WTRU may receive a retransmission request for the data associated with the PDU. The WTRU may determine a retransmission scheme based on a triggering condition. The WTRU may send the data associated with the PDU using the determined retransmission scheme. For example, the WTRU may determine that a first triggering condition of multiple triggering conditions is satisfied. The first triggering condition may that the WTRU has retransmitted at least a threshold number of times. The WTRU may determine, based at least on the satisfaction of the first triggering condition, a retransmission scheme to send the data. The retransmission scheme may include a retransmission of the data associated with the PDU using a sidelink (SL) and an uplink (UL).

Abstract: A wireless transmit/receive unit (WTRU) and methods implemented therein are described. A method, implemented in a WTRU configured in multipath with mode 2 on sidelink and at least one flexible radio bearer configured with both a Uu logical channel and an SL logical channel, includes receiving a configuration for a dedicated Uu scheduling request (SR) related to a condition associated with mode 2 resource selection. The WTRU transmits the dedicated Uu SR based on the condition being met.

Abstract: Methods, apparatuses, and computer-readable storage media for facilitating condition mobility may perform conditional path switching. In various embodiments, handover of a WTRU from a current cell to a target cell may involve an intermediate relay WTRU, wherein the handover may occur upon specific conditions being met. For example, a remote WTRU may receive path switching configuration information associated with each of a plurality of candidate relay WTRUs. The remote WTRU may select a relay WTRU from the plurality of candidate relay WTRUs based on conditions being satisfied. The path switching configuration information associated with the selected relay WTRU may be applied to the remote WTRU. The remote WTRU may send a message to a network regarding the plurality of candidate relay WTRUs, and may receive an indication to connect to another relay WTRU.

Abstract: A WTRU may be configured to receive a bearer configuration information. For example, the bearer configuration information may comprise at least one of: a configuration for a first bearer that is associated with a direct path, a configuration for a second bearer that is associated with an indirect path, and/or a configuration for a third bearer that is associated with the direct path and the indirect path. The WTRU may receive data at the third bearer. The WTRU may determine a BSR type associated with the received data based at least on a primary path configured for the WTRU. For example, if the primary path configured for the WTRU is the direct path, BSR type may be determined to be the Uu BSR. If, for example, the primary path configured for the WTRU is the indirect path, the BSR type may be determined to be a SL BSR.

Abstract: Methods, apparatuses, and computer-readable storage media for implementing condition mobility may facilitate conditional path switching. In various embodiments, handover of a WTRU from a current cell to a target cell may involve a relay WTRU, wherein the handover may occur upon specific conditions being met. For example, a remote WTRU may receive conditional path switching configuration information associated with a target relay WTRU. The information may comprise a triggering condition and sidelink (SL) reconfiguration information associated with each of a plurality of candidate relay WTRUs. Upon a determination that the triggering condition has been satisfied, the remote WTRU may apply the conditional path switching configuration information associated with the target relay WTRU.

Abstract: A wireless transmit/receive unit may be configured to receive a bearer configuration information. For example, the bearer configuration information may comprise at least one of: a configuration for a bearer that is associated with a direct path, a configuration for a bearer that is associated with an indirect path, and/or a configuration for a bearer that is associated with the direct path and the indirect path. Each of the bearers may be associated with a priority. The WTRU may receive data at one of the bearers. The WTRU may determine a BSR type (e.g., Uu BSR or a SL BSR) based on a cell ID of the direct path and a cell ID of the indirect path. For example, if the cell ID associated with the direct path and the cell ID associated with the indirect path are the same, the BSR type may be the Uu BSR.

Abstract: A wireless transmit/receive unit (WTRU) may determine an identifier of the first WTRU and/or an identifier of a second WTRU. The first WTRU and/or the second WTRU may be configured for communication via a PC5 connection. The first WTRU may receive configuration information. The configuration information may include an indication of a time period associated with a relay selection procedure. The first WTRU may determine satisfaction of a trigger condition. The trigger condition may be associated with channel conditions of the PC5 connection with the second WTRU. The first WTRU may determine, based on satisfaction of the trigger condition, whether to initiate a discovery and/or link modification procedure and/or wait the time period associated with the relay selection procedure. The WTRU may make this decision based on a comparison between the identifier of the first WTRU and the identifier of the second WTRU.

Abstract: A relay wireless transmit/receive unit (WTRU) may receive, from a base station, an adaptation layer configuration which maps an incoming sidelink (SL) logical channel (LCH) to one or more Uu LCHs. The WTRU may receive, from the base station, a configuration of a set of allowable carriers for each of the incoming SL LCHs of each remote WTRU. The relay WTRU may receive, from one or more remote WTRUs, an indication of whether carrier restriction is required for a SL LCH. Also, the relay WTRU may select one or more carrier(s) for transmission of data for the Uu LCH from the intersection of the allowable carriers of each of the remote WTRU's SL LCHs that map to the Uu LCH, and which have the need for carrier restriction signaled by the remote WTRUs. Further, the relay WTRU may then transmit the data using the Uu LCH on the selected carrier(s).

Abstract: A wireless transmit/receive unit (WTRU) may receive configuration information comprising one or more of a synchronization signal block (SSB) muting pattern, cell wake up signal (WUS) resources, and/or a reference signal received power (RSRP). The WTRU may measure a first set of non-muted SSBs associated with the SSB muting pattern. The WTRU may determine the measurements of each of the first set of non-muted SSBs are below the RSRP threshold. The WTRU may send a cell WUS indication based on the determination that the measurements of each of the first set of non-muted SSBs are below the RSRP threshold. The WTRU may receive a WUS response that indicates a second set of non-muted SSBs. The WTRU may measure the second set of non-muted SSBs. The WTRU may select an SSB, from the second set of non-muted SSBs based on the measurements of the second set of non-muted SSBs.

Abstract: A wireless transmit/receive unit (WTRU) may receive configuration information. The configuration information may include a sidelink reference signal receive power (SL-RSRP) threshold and/or a time period associated with discovery solicitation. The WTRU may determine whether radio link failure (RLF) has occurred on a PCS connection with a second WTRU or whether a SL-RSRP measurement on the PCS connection is below the SL-RSRP threshold. The WTRU may be based on a determination that RLF has occurred on the PCS connection with the second WTRU. The WTRU may send a solicitation message or a link modification message. The link modification message may include an indication of RLF detection on the PCS connection. The WTRU may receive an announcement message from a relay WTRU; select the relay WTRU for communication with the second WTRU; and send a release message to the second WTRU that causes the second WTRU to release the PCS connection.

Abstract: A wireless transmit/receive unit (WTRU) and methods implemented therein are described. The WTRU is in mode 2 and configured with a flexible radio bearer configured with a Uu logical channel and a sidelink logical channel. Based on a trigger to transmit a buffer status report (BSR) for one or more buffers that contain an amount of data, the WTRU determines a percentage of the amount of the data stored in the one or more buffers to report for the Uu logical channel for the flexible radio bearer based on one or more of a quality of service (QoS) configured for the flexible radio bearer, a sidelink channel busy ratio (CBR), or a type of sensing the WTRU is configured to perform. The WTRU transmits the BSR reporting the determined percentage of the data in the one or more buffers based on the determined percentage being less than one hundred percent.

Abstract: Methods, apparatuses, and computer-readable storage media for implementing condition mobility may facilitate conditional path switching. In various examples, handover of a WTRU from a current cell to a target cell may involve an intermediate relay WTRU, wherein the handover occurs upon specific conditions being met. A relay WTRU may facilitate conditional path switching, wherein the relay WTRU receives conditional reconfiguration information comprising an identity of a remote WTRU and configuration information associated with the remote WTRU. The relay WTRU may receive an indication that the remote WTRU has performed a path switch to the relay WTRU, and the relay WTRU may be configured with the remote WTRU configuration information. Subsequently, the relay WTRU may send an RRC complete message indicating that the relay WTRU has been configured with the remote WTRU configuration information.

Abstract: A remote wireless transmit/receive unit (WTRU) may receive, from a base station, an index of carriers to be used by a relay WTRU, and an indication of whether duplication is activated or deactivated. The remote WTRU may also receive, from the base station, information regarding a threshold amount of delay related to sidelink (SL) transmission. Further, the remote WTRU may receive, from the base station, information regarding a set of configured cell groups. If the cell identity (ID) of the relay WTRU and the primary cell (PCell) are in the same configured cell group, the remote WTRU may transmit, to the relay WTRU, a medium access control (MAC) control element (CE) indicating the index of the carriers to be used by the relay WTRU for carrier restriction and the SL-logical channels (LCHs) that have duplication activated. In an example, the MAC CE may be transmitted via SL.

Abstract: A wireless transmit/receive unit (WTRU) may be configured to receive a configuration information. The WTRU may be a remote WTRU. The configuration information may comprise one or more measurement conditions. The measurement conditions may be associated with one or more relay WTRUs. The WTRU may determine whether the one or more measurement conditions are satisfied and may determine a priority for each associated relay WTRUs. The priority may be based on the time difference between when the WTRU received the configuration information, and when the WTRU determined an associated measurement condition was satisfied. The WTRU may select between the one or more relay WTRUs based on the determined priority.

Abstract: A wireless transmit/receive unit (WTRU) may be configured to receive a reconfiguration message. The WTRU may be a remote WTRU. The reconfiguration message may be associated with a target. The WTRU may be configured to determine one or more conditions associated with the target. The reconfiguration may be transmitted from a second WTRU. The second WTRU may be a relay WTRU. In some scenarios, the WTRU may be configured to determine whether the target triggers the one or more conditions. The WTRU may be configured to select a target based on the one or more triggered conditions. In some scenarios, the WTRU may be configured to transmit a configuration acknowledgement message based on the selected target.

Abstract: A wireless transmit/receive unit (WTRU) may receive configuration information including a set of two or more synchronization signal block (SSB) muting patterns, indication that a first SSB muting pattern from the set of two or more SSB muting patterns is activated, a reference signal received power (RSRP) threshold, and/or one or more delay threshold values. The WTRU may receive a wake up signal (WUS) response that indicates activation of a second SSB muting pattern of the set of two or more SSB muting patterns, and/or a third SSB muting pattern of the set of two or more SSB muting patterns. The WTRU may perform measurements on one or more non-muted SSBs based on the first muting pattern, the third muting pattern, and/or another SSB muting pattern indicated by the WUS response. The WTRU may select a non-muted SSB of the one or more non-muted SSBs based on the performed measurements.