Patent Description:
"Downlink" (or "forward link") refers to the communication link from the BS to the UE, and the "uplink" (or "reverse link") refers to the communication link from the UE to the BS.

<NPL>), <NPL>), <NPL>), <CIT>(NEC CORP [JP]) <NUM> April <NUM> (<NUM>-<NUM>-<NUM>) all discuss the occurrence of DRX on the PC5 and Uu interfaces of a relay.

In some aspects, a method of wireless communication, performed by a remote user equipment (UE), may include identifying a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE.

In some aspects, a method of wireless communication, performed by a relay UE, may include identifying, while in a connected discontinuous reception mode, a remote UE, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and relaying one or more layer-<NUM> communications between the base station and the remote UE.

In some aspects, a method of wireless communication, performed by a base station (BS), may include identifying a remote UE and a relay UE that is operating in a connected discontinuous reception mode; configuring one or more links between two or more of the remote UE, the relay UE, or the BS based at least in part on identifying the remote UE and the relay UE, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and
station are radio resource control configured by the base station; and transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links.

In some aspects, a remote UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to identify a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and transmit one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE.

In some aspects, a relay UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to identify, while in a connected discontinuous reception mode, a remote UE, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and relay one or more layer-<NUM> communications between the base station and the remote UE.

In some aspects, a BS for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to identify a remote UE and a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; configure one or more links between two or more of the remote UE, the relay UE, or the BS based at least in part on identifying the remote UE and the relay UE; and transmit one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a remote UE, may cause the one or more processors to identify a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and transmit one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a relay UE, may cause the one or more processors to identify, while in a connected discontinuous reception mode, a remote UE, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and relay one or more layer-<NUM> communications between the base station and the remote UE.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a BS, may cause the one or more processors to identify a remote UE and a relay UE that is operating in a connected discontinuous reception mode; configure one or more links between two or more of the remote UE, the relay UE, or the BS based at least in part on identifying the remote UE and the relay UE, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and transmit one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links.

In some aspects, an apparatus for wireless communication may include means for identifying a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE and the apparatus are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the apparatus, and wherein one or more links between two or more of the apparatus, the relay UE, or the base station are radio resource control configured by the base station; and means for transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE.

In some aspects, an apparatus for wireless communication may include means for identifying, while in a connected discontinuous reception mode, a remote UE, wherein the apparatus and the remote UE are connected to a base station, wherein the apparatus is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the apparatus, or the base station are radio resource control configured by the base station; and means for relaying one or more layer-<NUM> communications between the base station and the remote UE.

In some aspects, an apparatus for wireless communication may include means for identifying a remote UE and a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE is in a discontinuous reception mode on a first link with the apparatus and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the apparatus are radio resource control configured by the apparatus; means for configuring one or more links between two or more of the remote UE, the relay UE, or the apparatus based at least in part on identifying the remote UE and the relay UE; and means for transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links.

While aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios. Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements. For example, some aspects may be implemented via integrated chip embodiments or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, or artificial intelligence-enabled devices). Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating described aspects and features may include additional components and features for implementation and practice of claimed and described aspects. For example, transmission and reception of wireless signals may include a number of components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processor(s), interleavers, adders, or summers). It is intended that aspects described herein may be practiced in a wide variety of devices, components, systems, distributed arrangements, or end-user devices of varying size, shape, and constitution.

It should be noted that while aspects may be described herein using terminology commonly associated with a <NUM> or New Radio (NR) radio access technology (RAT), aspects of the present disclosure can be applied to other RATs, such as a <NUM> RAT, a <NUM> RAT, and/or a RAT subsequent to <NUM> (e.g., <NUM>). The claimed invention corresponds to <FIG>, <FIG> and to the related text in the description. The remaining figures and the text of the description are intended to better explain the invention.

Controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform one or more techniques associated with a layer <NUM> UE relay procedure, as described in more detail elsewhere herein. For example, controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. Memories <NUM> and <NUM> may store data and program codes for base station <NUM> and UE <NUM>, respectively. In some aspects, memory <NUM> and/or memory <NUM> may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and/or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, and/or interpreting) by one or more processors of the base station <NUM> and/or the UE <NUM>, may cause the one or more processors, the UE <NUM>, and/or the base station <NUM> to perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, and/or interpreting the instructions, among other examples.

In some aspects, UE <NUM> may include means for identifying a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE and UE <NUM> are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station, means for transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE, and/or the like. In some aspects, UE <NUM> may include means for identifying, while in a connected discontinuous reception mode, a remote UE, wherein UE <NUM> and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station, means for relaying one or more layer-<NUM> communications between the base station and the remote UE, and/or the like. In some aspects, such means may include one or more components of UE <NUM> described in connection with <FIG>, such as controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, and/or the like.

In some aspects, BS <NUM> may include means for identifying a remote UE and a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station, means for configuring one or more links between two or more of the remote UE, the relay UE, or BS <NUM> based at least in part on identifying the remote UE and the relay UE, means for transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links, and/or the like. In some aspects, such means may include one or more components of BS <NUM> described in connection with <FIG>, such as antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like.

<FIG> is a diagram illustrating an example <NUM> of a protocol stack for layer <NUM> UE relaying, in accordance with the present disclosure.

As shown in <FIG>, an NR protocol stack includes a non-access stratum (NAS) layer, a radio resource control (RRC) layer, and/or a packet data convergence protocol (PDCP) layer, among other examples. The PDCP layer may be layer <NUM> in the NR protocol stack and may include a plurality of sub-layers. For example, the PDCP layer may include an adaptation sub-layer (e.g., a service data adaptation protocol (SDAP) sub-layer), a radio link control (RLC) sub-layer, a medium access control (MAC) sub-layer, and/or a physical (PHY) sub-layer, among other examples.

When communicating directly with a BS (e.g., via a Uu interface), a remote UE may communicate at an NR-RLC sub-layer, an NR-MAC sub-layer, and an NR-PHY layer. However, in a relay scenario, the remote UE may communicate via a PC5 interface with a relay UE. For example, the remote UE may include a PC5-RLC sub-layer, a PC5-MAC sub-layer, and a PC5-PHY sub-layer to communicate with a corresponding PC5-RLC sub-layer, PC5-MAC sub-layer, and PC5-PHY sub-layer of the relay UE. The relay UE may also include an NR-RLC sub-layer, an NR-MAC sub-layer, and an NR-PHY sub-layer to communicate via a Uu interface with corresponding sub-layers of the BS. Based at least in part on passing information between PC5 sub-layers and NR sub-layers, the relay UE enables layer <NUM> relaying between the remote UE and the BS.

<FIG> is a diagram illustrating an example <NUM> of layer <NUM> UE relaying, in accordance with the present disclosure. As shown in <FIG>, example <NUM> may include a remote UE <NUM> (e.g., which may correspond to UE 120e), a relay UE <NUM> (e.g., which may correspond to UE 120a), and a BS <NUM> (e.g., which may correspond to BS <NUM>).

As further shown in <FIG>, and by reference number <NUM>, in some aspects, remote UE <NUM> may transmit a request for relaying. For example, remote UE <NUM> may transmit a set of unicast messages, broadcast messages, and/or multicast messages, among other examples, requesting availability of another UE for relaying of communications with BS <NUM>. As shown in by reference number <NUM>, relay UE <NUM> may provide information indicating an availability of relaying. For example, relay UE <NUM> may receive a request for relaying from remote UE <NUM> and may transmit a response message indicating an availability for relaying. In this case, relay UE <NUM> may determine an availability for relaying based at least in part on a UE capability, a level of communication activity on relay UE <NUM>, and/or a use of relay UE <NUM> for relaying for another UE, among other examples. Additionally, or alternatively, relay UE <NUM> may periodically transmit signaling indicating an availability for relaying (e.g., via broadcast signaling) and remote UE <NUM> may detect the signaling indicating the availability for relaying. In some aspects, relay UE <NUM> may be in a connected discontinuous reception (C-DRX) mode on a Uu interface with BS <NUM>.

As further shown in <FIG>, and by reference number <NUM>/<NUM>', remote UE <NUM> and/or relay UE <NUM> may transmit a notification to BS <NUM> indicating an availability of relaying. For example, remote UE <NUM> may indicate an identification of relay UE <NUM>. In some aspects, remote UE <NUM> may provide a measurement report regarding a sidelink connection between remote UE <NUM> and relay <NUM>. For example, remote UE <NUM> may provide a measurement report that includes an identifier of relay UE <NUM>. In this case, remote UE <NUM> may include an explicit identifier of relay UE <NUM>, and/or an implicit identifier of relay UE <NUM>, among other examples, in the measurement report. In some aspects, relay UE <NUM> may remain in the C-DRX mode on the Uu interface with BS <NUM>. For example, when remote UE <NUM> provides the measurement report, relay UE <NUM> may remain in the C-DRX mode on the Uu interface with BS <NUM>.

Additionally, or alternatively, based at least in part on remote UE <NUM> identifying relay UE <NUM> for relaying, relay UE <NUM> may transition from the C-DRX mode to another mode and may provide information to BS <NUM>. For example, relay UE <NUM> may transmit a scheduling request in a DRX off mode to BS <NUM>. In this case, relay UE <NUM> may indicate, to BS <NUM>, an identification of remote UE <NUM> and/or provide a measurement report of the sidelink between remote UE <NUM> and relay UE <NUM> to trigger relaying. In some aspects, relay UE <NUM> may delay transmitting information regarding relaying to BS <NUM> until a DRX on period occurs. For example, when relay UE <NUM> enters a DRX on period, relay UE <NUM> may use the DRX on period to transmit information regarding remote UE <NUM>, and/or a measurement report, among other examples.

As further shown in <FIG>, and by reference numbers <NUM>, BS <NUM> may transmit sidelink establishment messages to relay UE <NUM> and/or remote UE <NUM>. For example, BS <NUM> may, based at least in part on the measurement report, determine to activate relay UE <NUM> for relaying. In this case, BS <NUM> may transmit information to establish a sidelink relaying connection between remote UE <NUM> and relay UE <NUM>. In some aspects, BS <NUM> may transmit a reconfiguration message to relay UE <NUM> and/or remote UE <NUM> to establish the sidelink connection. As shown reference numbers <NUM> and <NUM>, based at least in part on establishing the sidelink connection, BS <NUM> may allocate resources for relaying and communicate using relay UE <NUM> as a relay. For example, BS <NUM> may transmit information identifying a grant to relay UE <NUM>. Additionally, or alternatively, BS <NUM> may configure a grant on a Uu interface between relay UE <NUM> and BS <NUM>. In this case, using the identified grant or configured grant, BS <NUM> and remote UE <NUM> may communicate via relay UE <NUM>. For example, relay <NUM> may provide layer <NUM> relaying of PDCP data, as described above.

As further shown in <FIG>, and by reference number <NUM>, in some aspects, remote UE <NUM> may transmit a request for relaying. For example, remote UE <NUM> may transmit a set of unicast messages, broadcast messages, and/or multicast messages, among other examples, requesting availability of another UE for relaying of communications with BS <NUM>. As shown in by reference number <NUM>, relay UE <NUM> may provide information indicating an availability of relaying. For example, when relay UE <NUM> is in a DRX mode on a sidelink, relay UE <NUM> may receive a request for relaying from remote UE <NUM> and may transmit a response message indicating an availability for relaying during a sidelink DRX on time. Additionally, or alternatively, relay UE <NUM> may periodically transmit signaling indicating an availability for relaying (e.g., via broadcast signaling during the sidelink DRX on time) and remote UE <NUM> may detect the signaling indicating the availability for relaying.

As further shown in <FIG>, and by reference number <NUM>/<NUM>', remote UE <NUM> or relay UE <NUM> may transmit a notification to BS <NUM> indicating an availability of relaying. For example, remote UE <NUM> may indicate an identification of relay UE <NUM>, and/or a measurement report regarding a sidelink connection between remote UE <NUM> and relay <NUM>, among other examples.

Additionally, or alternatively, based at least in part on remote UE <NUM> identifying relay UE <NUM> for relaying, relay UE <NUM> may remain in a C-DRX mode on a sidelink, and may communicate with BS <NUM> to indicate identification of remote UE <NUM> and/or to provide a measurement report. In some aspects, when relay UE <NUM> is in a C-DRX mode on a Uu link, relay UE <NUM> may come out of the C-DRX mode on the Uu link and transmit a scheduling request, and/or a measurement report, among other examples.

As further shown in <FIG>, and by reference numbers <NUM>, BS <NUM> may transmit a sidelink establishment message to relay UE <NUM> and/or remote UE <NUM>. For example, BS <NUM> may activate relay UE <NUM> during an on time of relay UE <NUM> and may provide grants relay UE <NUM> to perform relaying. In this case, BS <NUM> may configure resources for relay UE <NUM> to perform relaying, which may cause relay UE <NUM> to transition out of a C-DRX mode on a Uu link, and/or a sidelink, among other examples, as shown by reference number <NUM>, and perform relaying, as shown in by reference number <NUM>.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a remote UE, in accordance with the present disclosure. Example process <NUM> is an example where the remote UE (e.g., UE <NUM>, remote UE <NUM>, and/or remote UE <NUM>) performs operations associated with layer <NUM> UE relaying.

As shown in <FIG>, in some aspects, process <NUM> include identifying a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station (block <NUM>). The remote UE (e.g., using controller/processor identifies a relay UE that is operating in a connected discontinuous reception mode, as described above. In some aspects, the relay UE and the remote UE are connected to a base station. In some aspects, the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE. In some aspects, one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station.

As further shown in <FIG>, in some aspects, process <NUM> includes transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE (block <NUM>). The remote UE (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, and/or antenna <NUM>) transmits one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the base station via the relay UE, as described above.

In a first aspect, transmitting the one or more layer-<NUM> communications to or receiving the one or more layer-<NUM> communications from the base station via the relay UE includes communicating with the base station via a packet data convergence protocol split bearer.

In a second aspect, alone or in combination with the first aspect, one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured.

In a third aspect, alone or in combination with one or more of the first and second aspects, data is scheduled on one or more links between two or more of the remote UE, the relay UE, or the base station based at least in part on at least one of a link quality, a resource availability, a time division duplexing configuration, a transmit beam configuration, a receive beam configuration, or a carrier frequency.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, process <NUM> includes performing a radio link monitoring procedure on one or more links between the remote UE and the relay UE or the remote UE and the base station; and initiating a radio link failure recovery procedure based at least in part on a result of performing the radio link monitoring procedure.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, identifying the relay UE includes transmitting one or more requests for relaying, and detecting signaling identifying an availability of the relay UE for relaying.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, identifying the relay UE includes transmitting information indicating a detection of the relay UE for relaying.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the information includes at least one of a measurement report of a link between the remote UE and the relay UE, or a UE identifier.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process <NUM> includes receiving, from the base station, a reconfiguration message to establish a dedicated sidelink with the relay UE.

<FIG> is a diagram illustrating an example process <NUM> performed, by a relay UE, in accordance with the invention. Example process <NUM> is an example where the relay UE (e.g., UE <NUM>, relay UE <NUM>, and/or relay UE <NUM>) performs operations associated with layer <NUM> UE relaying.

As shown in <FIG>, in some aspects, process <NUM> includes identifying, while in a connected discontinuous reception mode, a remote UE, wherein the relay UE and the remote UE are connected to a base station, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station (block <NUM>). The relay UE (e.g., using controller/processor <NUM>) identifies, while in a connected discontinuous reception mode, a remote UE, as described above. In some aspects, the relay UE and the remote UE are connected to a base station. In some aspects, the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE. In some aspects, one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station.

As further shown in <FIG>, in some aspects, process <NUM> includes relaying one or more layer-<NUM> communications between the base station and the remote UE (block <NUM>). The relay UE (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, and/or antenna <NUM>) relays one or more layer-<NUM> communications between the base station and the remote UE, as described above.

In a first aspect, relaying the one or more layer-<NUM> communications between the base station and the remote UE includes relaying the one or more layer-<NUM> communications via a packet data convergence protocol split bearer.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, process <NUM> includes performing a radio link monitoring procedure on one or more links between the remote UE and the relay UE or the relay UE and the base station; and initiating a radio link failure recovery procedure based at least in part on a result of performing the radio link monitoring procedure.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, identifying the remote UE includes receiving, from the remote UE, one or more requests for relaying, and transmitting signaling identifying an availability of the relay UE for relaying.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the one or more requests are received during a sidelink discontinuous reception on time and the signaling identifying the availability of the relay UE is broadcasted during the sidelink discontinuous reception on time.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process <NUM> includes remaining in the connected discontinuous reception mode on a link with the base station based at least in part on identifying the remote UE.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process <NUM> includes transitioning from the connected discontinuous reception mode to another mode on a link with the base station based at least in part on identifying the remote UE.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, identifying the remote UE includes switching from the connected discontinuous reception mode to another mode, and transmitting information indicating identification of the remote UE to the base station.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, process <NUM> includes receiving, from the base station, a reconfiguration message to establish a dedicated sidelink with the remote UE.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a BS, in accordance with the present disclosure. Example process <NUM> is an example where the BS (e.g., BS <NUM>, BS <NUM>, and/or BS <NUM>) performs operations associated with layer <NUM> UE relaying.

As shown in <FIG>, in some aspects, process <NUM> may include identifying a remote UE and a relay UE that is operating in a connected discontinuous reception mode, wherein the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station (block <NUM>). For example, the BS (e.g., using controller/processor <NUM>) may identify a remote UE and a relay UE that is operating in a connected discontinuous reception mode, a remote UE, as described above. In some aspects, the relay UE is in a discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE. In some aspects, one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station.

As further shown in <FIG>, in some aspects, process <NUM> may include configuring one or more links between two or more of the remote UE, the relay UE, or the BS based at least in part on identifying the remote UE and the relay UE (block <NUM>). For example, the BS (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, and/or antenna <NUM>) may configure one or more links between two or more of the remote UE, the relay UE, or the BS based at least in part on identifying the remote UE and the relay UE, as described above.

As further shown in <FIG>, in some aspects, process <NUM> may include transmitting one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links (block <NUM>). For example, the BS (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, and/or antenna <NUM>) may transmit one or more layer-<NUM> communications to or receiving one or more layer-<NUM> communications from the remote UE via the relay UE based at least in part on configuring the one or more links, as described above.

As an example, "at least one of a, b, or c" is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

Claim 1:
A method of wireless communication performed by a remote user equipment, UE (<NUM>, <NUM>), comprising:
identifying (<NUM>) a relay UE (<NUM>, <NUM>) that is operating in a connected discontinuous reception mode, wherein the relay UE and the remote UE are connected to a base station (<NUM>,<NUM>), wherein the relay UE is in the connected discontinuous reception mode on a first link with the base station and a discontinuous reception mode or an active mode on a sidelink with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are radio resource control configured by the base station; and
transmitting (<NUM>) one or more layer-<NUM> communications to, or receiving one or more layer-<NUM> communications from, the base station via the relay UE based at least in part on the relay UE (<NUM>, <NUM>) being transitioned to another mode, different from the connected discontinuous reception mode, on the link with the base station (<NUM>, <NUM>).