Layer 2 User Equipment Relay Process

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a remote user equipment may identify a relay UE 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 is in a discontinuous reception mode or an active mode on a bypass 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 one or more layer 2 communications are sent to the base station or received from the base station via the relay UE.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 988,835, filed on March 12, 2020, entitled “LAYER 2USER EQUIPMENT RELAY PROCEDURE,” and U.S. Non-Provisional Patent Application No. 17 / 197,396, filed on March 10, 2021, entitled “LAYER2USER EQUIPMENT RELAY PROCEDURE,” which are expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for layer 2 user equipment (UE) relay procedures. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard released by the Third Generation Partnership Project (3GPP).

[0005] A wireless network may include several base stations (BSs) that can support communications for several user equipments (UEs). A UE may communicate with a BS via a downlink and an uplink. A "downlink" (or "forward link") refers to a communication link from a BS to a UE, while an "uplink" (or "reverse link") refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Head, Transmit Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at a city, country, region, and even global level. NR (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and other open standards that support beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful. Summary of the invention

[0007] In some aspects, a method of wireless communication performed by a remote user equipment (UE) may include: identifying a relay UE 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 in a discontinuous reception mode or an active mode on a bypass with the remote UE, wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control of the base station; and sending one or more layer 2 communications to the base station or receiving one or more layer 2 communications from the base station via the relay UE.

[0008] In some aspects, a method of wireless communication performed by a relay UE may include: identifying a remote UE while 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 is in a discontinuous reception mode or an active mode on a bypass with the remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, and the remote UE are configured by radio resource control of the base station; and one or more layer 2 communications between the relay base station and the remote UE.

[0009] In some aspects, a method of wireless communication performed by a base station (BS) may include: identifying a remote UE and a relay UE operating in a connected discontinuous reception mode; configuring one or more links between the remote UE, the relay UE, or two or more of 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 is in a discontinuous reception mode or an active mode on a bypass with the remote UE, and wherein the one or more links between the remote UE, the relay UE, or two or more of the base station are configured by radio resource control by the base station; and sending one or more layer 2 communications to the remote UE via the relay UE or receiving one or more layer 2 communications from the remote UE based at least in part on configuring the one or more links.

[0010] 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 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 is in a discontinuous reception mode or an active mode on a bypass with the remote UE, wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control of the base station; and send one or more layer 2 communications to the base station or receive one or more layer 2 communications from the base station via the relay UE.

[0011] 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 a remote UE while 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 is in a discontinuous reception mode or an active mode on a bypass with the remote UE, wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control of the base station; and one or more layer 2 communications between the relay base station and the remote UE.

[0012] 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 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control of the base station; based at least in part on identifying the remote UE and the relay UE, one or more links between two or more of the remote UE, the relay UE, or the BS are configured; and based at least in part on configuring the one or more links, one or more layer 2 communications are sent to the remote UE via the relay UE or received from the remote UE.

[0013] 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 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 in a discontinuous reception mode or an active mode on a bypass with the remote UE, 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 send one or more layer 2 communications to the base station or receive one or more layer 2 communications from the base station via the relay UE.

[0014] 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 a remote UE while 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 in a discontinuous reception mode or an active mode on a bypass with the remote UE, wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control of the base station; and one or more layer 2 communications between the relay base station and the remote UE.

[0015] 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 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 is in a discontinuous reception mode or an active mode on a bypass with the remote UE, and wherein the one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control by the base station; and send one or more layer 2 communications to the remote UE via the relay UE or receive one or more layer 2 communications from the remote UE based at least in part on configuring the one or more links.

[0016] In some aspects, an apparatus for wireless communication may include: a component for identifying a relay UE 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 in a discontinuous reception mode or an active mode on a bypass 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 a component for sending one or more layer 2 communications to the base station or receiving one or more layer 2 communications from the base station via the relay UE.

[0017] In some aspects, an apparatus for wireless communication may include: a component for identifying a remote UE while in a connected discontinuous reception mode, 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 in a discontinuous reception mode or an active mode on a bypass 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 a component for relaying one or more layer 2 communications between the base station and the remote UE.

[0018] In some aspects, an apparatus for wireless communication may include: a component for identifying a remote UE and a relay UE 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 is in a discontinuous reception mode or an active mode on a bypass with the remote UE, and wherein one or more links between the remote UE, the relay UE, or two or more of the apparatus are radio resource control configured by the apparatus; a component for configuring one or more links between the remote UE, the relay UE, or two or more of the apparatus based at least in part on identifying the remote UE and the relay UE; and a component for sending one or more layer 2 communications to the remote UE via the relay UE or receiving one or more layer 2 communications from the remote UE based at least in part on configuring the one or more links.

[0019] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying drawings and description.

[0020] The features and technical advantages of the examples according to the present disclosure have been outlined quite extensively above so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as the basis for modifying or designing other structures for performing the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (both their organization and method of operation) and the associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims.

[0021] Although various aspects are described in the present disclosure by the description of some examples, it will be understood by those skilled in the art that these aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments or other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchase equipment, medical devices, or devices that implement artificial intelligence). Various aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. The equipment containing the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include several components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers). The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements, or end-user devices of different sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to be able to understand the above-mentioned features of the present disclosure in detail, a more specific description briefly summarized above can be obtained by reference to various aspects, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0023] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0024] Figure 2 is a diagram showing an example in which a base station and a UE are in communication in a wireless network according to the present disclosure.

[0025] Figure 3 is a diagram illustrating an example of a protocol stack for layer 2 UE relay according to the present disclosure.

[0026] Figure 4 is a diagram illustrating an example of layer 2 UE relay according to the present disclosure.

[0027] Figure 5 is a diagram illustrating an example of layer 2 UE relay according to the present disclosure.

[0028] Figure 6 is a diagram illustrating an example process performed, for example, by a remote UE according to the present disclosure.

[0029] Figure 7 is a diagram illustrating an example process performed, for example, by a relay UE according to the present disclosure.

[0030] Figure 8 is a diagram illustrating an example process performed, for example, by a BS according to the present disclosure. DETAILED DESCRIPTION

[0031] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings of this article, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method that is practiced using other structures, functions, or structures and functions other than the various aspects of the present disclosure set forth herein or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0032] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements") and illustrated in the accompanying drawings. These elements may be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0033] It should be noted that although various aspects may be described herein using terminology generally associated with 5G or new radio (NR) radio access technology (RAT), various aspects of the present disclosure can be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0034] Figure 1is a diagram showing an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be or may include other examples such as elements of a 5G (NR) network and / or an LTE network. The wireless network 100 may include several base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0035] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0036] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (such as direct physical connections or virtual networks) using any suitable transport network.

[0037] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, or the like.

[0038] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0039] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly via a wireless or wired backhaul.

[0040] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle-mounted component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0041] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors and / or location tags that can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or provide a connection to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (e.g., a processor component and / or a memory component). In some aspects, the processor component and the memory component may be coupled together. For example, a processor component (eg, one or more processors) and a memory component (eg, memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0042] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0043] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more bypass channels (e.g., without using base station 110 as an intermediary for communicating with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol or vehicle-to-infrastructure (V2I) protocol) and / or mesh network. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations performed by base station 110 as described elsewhere herein.

[0044] The devices of the wireless network 100 can communicate using an electromagnetic spectrum, which can be subdivided into various categories, frequency bands, channels, etc. based on frequency or wavelength. For example, the devices of the wireless network 100 can communicate using an operating band having a first frequency range (FR1), which can span 410 MHz to 7.125 GHz, and / or can communicate using an operating band having a second frequency range (FR2), which can span 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a "below 6 GHz" band. Similarly, FR2 is often referred to as a "millimeter wave" band, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise specifically stated, it should be understood that the term "below 6 GHz" and the like (if used herein) can broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise specifically stated, it should be understood that the term "millimeter wave" and the like (if used herein) can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0045] As mentioned above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0046] Figure 2 is a diagram illustrating an example 200 of base station 110 communicating with UE 120 in wireless network 100 according to the present disclosure. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0047] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for the UE based at least in part on a channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS (or multiple) selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively.

[0048] At the UE 120, antennas 252a to 252r may receive downlink signals from the base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a channel quality indicator (CQI) parameter, among other examples. In some aspects, one or more components of the UE 120 may be included in the housing 284.

[0049] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0050] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or may be included in, one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, among other examples. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or antenna elements within multiple housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (such as Figure 2 One or more antenna elements of one or more components).

[0051] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, where applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of the UE 120 may be included in a modem of the UE 120. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antennas 252, modulators and / or demodulators 254, MIMO detectors 256, receive processors 258, transmit processors 264, and / or TX MIMO processors 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figure 4-8 As described.

[0052] At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and / or uplink communications. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of the base station 110 may be included in a modem of the base station 110. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antennas 234, modulators and / or demodulators 232, MIMO detectors 236, receive processors 238, transmit processors 220, and / or TX MIMO processors 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figure 4-8 As described.

[0053] As described in more detail elsewhere herein, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components of the base station 110 may perform one or more techniques associated with the layer 2 UE relay process. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct e.g. Figure 6 The process of 600 Figure 7 The process 700 Figure 8 800, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 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, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, conversion, and / or interpretation), may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example, Figure 6 The process of 600 Figure 7 The process 700 Figure 8 The process 800 and / or operations of other processes as described herein. In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among other examples.

[0054] In some aspects, UE 120 may include: means for identifying a relay UE operating in a connected discontinuous reception mode, wherein the relay UE and UE 120 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 is in a discontinuous reception mode or an active mode on a bypass with a remote UE, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control of the base station; means for sending or receiving one or more layer 2 communications to or from the base station via the relay UE; and the like. In some aspects, UE 120 may include: means for identifying a remote UE while in a connected discontinuous reception mode, wherein the UE 120 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control of the base station; means for relaying one or more layer 2 communications between the base station and the remote UE; and the like. In some aspects, such components may include a combination of Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0055] In some aspects, BS 110 may include: components for identifying a remote UE and a relay UE 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 is in a discontinuous reception mode or an active mode on a bypass 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; components for configuring one or more links between the remote UE, the relay UE, or two or more of the BS 110 based at least in part on identifying the remote UE and the relay UE; components for sending one or more layer 2 communications to the remote UE or receiving one or more layer 2 communications from the remote UE via the relay UE based at least in part on configuring the one or more links; and so on. In some aspects, such components may include in combination Figure 2 One or more components of BS 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0056] Although Figure 2 The blocks in the 200 and 210 are shown as distinct components, but the functionality described above with respect to the blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0057] As mentioned above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0058] Figure 3 is a diagram illustrating an example 300 of a protocol stack for layer 2 UE relay according to the present disclosure.

[0059] like Figure 3 As shown, the 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, and others. The PDCP layer may be layer 2 in the NR protocol stack, and may include multiple sublayers. For example, the PDCP layer may include an adaptation sublayer (e.g., a service data adaptation protocol (SDAP) sublayer), a radio link control (RLC) sublayer, a medium access control (MAC) sublayer, and / or a physical (PHY) sublayer.

[0060] When communicating directly with the BS (e.g., via the Uu interface), the remote UE can communicate at the NR-RLC sublayer, NR-MAC sublayer, and NR-PHY layer. However, in a relay scenario, the remote UE can communicate with the relay UE via the PC5 interface. For example, the remote UE may include a PC5-RLC sublayer, a PC5-MAC sublayer, and a PC5-PHY sublayer to communicate with the corresponding PC5-RLC sublayer, PC5-MAC sublayer, and PC5-PHY sublayer of the relay UE. The relay UE may also include a NR-RLC sublayer, a NR-MAC sublayer, and a NR-PHY sublayer to communicate with the corresponding sublayers of the BS via the Uu interface. Based at least in part on the transfer of information between the PC5 sublayer and the NR sublayer, the relay UE implements layer 2 relay between the remote UE and the BS.

[0061] As mentioned above, Figure 3 are provided as examples. Other examples may differ from those described in Figure 3 Examples described.

[0062] Figure 4 4 is a diagram illustrating an example 400 of layer 2 UE relay according to the present disclosure. Figure 4As shown, example 400 may include a remote UE 405 (eg, which may correspond to UE 120e), a relay UE 410 (eg, which may correspond to UE 120a), and a BS 415 (eg, which may correspond to BS 110).

[0063] As in Figure 4 450, in some aspects, the remote UE 405 may send a request for relaying. For example, the remote UE 405 may send a set of unicast messages, broadcast messages, and / or multicast messages, and other examples, to request the availability of another UE for relaying communications with the BS 415. As shown in reference numeral 452, the relay UE 410 may provide information indicating the availability of the relay. For example, the relay UE 410 may receive a request for relaying from the remote UE 405, and may send a response message indicating the availability of the relay. In this case, the relay UE 410 may determine the availability of the relay based at least in part on the UE capabilities, the level of communication activity on the relay UE 410, and / or the use of the relay UE 410 for another UE, etc. In addition or alternatively, the relay UE 410 may periodically send signaling indicating the availability of the relay (e.g., via broadcast signaling), and the remote UE 405 may detect the signaling indicating the availability of the relay. In some aspects, the relay UE 410 may be in a connected discontinuous reception (C-DRX) mode on the Uu interface with the BS 415 .

[0064] As in Figure 4 454 / 454', the remote UE 405 and / or the relay UE 410 may send a notification to the BS 415 indicating the availability of the relay. For example, the remote UE 405 may indicate the identity of the relay UE 410. In some aspects, the remote UE 405 may provide a measurement report on the bypass connection between the remote UE 405 and the relay 410. For example, the remote UE 405 may provide a measurement report including an identifier of the relay UE 410. In this case, the remote UE 405 may include an explicit identifier of the relay UE 410 and / or an implicit identifier of the relay UE 410 in the measurement report, etc. In some aspects, the relay UE 410 may remain in C-DRX mode on the Uu interface with the BS 415. For example, when the remote UE 405 provides the measurement report, the relay UE 410 may remain in C-DRX mode on the Uu interface with the BS 415.

[0065] Additionally or alternatively, based at least in part on the remote UE 405 identifying the relay UE 410 for relaying, the relay UE 410 may transition from the C-DRX mode to another mode and may provide information to the BS 415. For example, the relay UE 410 may send a scheduling request to the BS 415 in the DRX off mode. In this case, the relay UE 410 may indicate the identity of the remote UE 405 to the BS 415 and / or provide a measurement report of the bypass between the remote UE 405 and the relay UE 410 to trigger the relay. In some aspects, the relay UE 410 may delay sending information about the relay to the BS 415 until the DRX on period occurs. For example, when the relay UE 410 enters the DRX on period, the relay UE 410 may use the DRX on period to send information about the remote UE 405 and / or measurement reports, etc.

[0066] As in Figure 4 456, BS 415 may send a bypass setup message to relay UE 410 and / or remote UE 405. For example, BS 415 may determine to activate relay UE 410 for relaying based at least in part on the measurement report. In this case, BS 415 may send information to establish a bypass relay connection between remote UE 405 and relay UE 410. In some aspects, BS 415 may send a reconfiguration message to relay UE 410 and / or remote UE 405 to establish a bypass connection. As shown in reference numerals 458 and 460, based at least in part on establishing a bypass connection, BS 415 may allocate resources for relaying and communicate using relay UE 410 as a relay. For example, BS 415 may send information identifying a grant to relay UE 410. Additionally or alternatively, BS 415 may configure the grant on the Uu interface between relay UE 410 and BS 415. In this case, using the identified grant or the configured grant, the BS 415 and the remote UE 405 may communicate via the relay UE 410. For example, as described above, the relay 410 may provide layer 2 relaying of PDCP data.

[0067] As mentioned above, Figure 4 are provided as examples. Other examples may differ from those described in Figure 4 Examples described.

[0068] Figure 5 5 is a diagram illustrating an example 500 of layer 2 UE relay according to the present disclosure. Figure 5As shown, example 500 may include a remote UE 505 (eg, which may correspond to UE 120e), a relay UE 510 (eg, which may correspond to UE 120a), and a BS 515 (eg, which may correspond to BS 110).

[0069] As in Figure 5 5 and further illustrated by reference numeral 550, in some aspects, the remote UE 505 may send a request for relaying. For example, the remote UE 505 may send a set of unicast messages, broadcast messages, and / or multicast messages, etc., to request the availability of another UE for relaying communications with the BS 515. As shown in reference numeral 552, the relay UE 510 may provide information indicating the availability of the relay. For example, when the relay UE 510 is in DRX mode on the bypass, the relay UE 510 may receive a request for relaying from the remote UE 505, and may send a response message indicating the availability of the relay during the bypass DRX on time. Additionally or alternatively, the relay UE 510 may periodically send signaling indicating the availability of the relay (e.g., via broadcast signaling during the bypass DRX on time), and the remote UE 505 may detect the signaling indicating the availability of the relay.

[0070] As in Figure 5 As further shown in the figure and by reference numeral 554 / 554', the remote UE 505 or the relay UE 510 may send a notification indicating the availability of the relay to the BS 515. For example, the remote UE 505 may indicate the identity of the relay UE 510 and / or a measurement report on the bypass connection between the remote UE 505 and the relay 510, among other examples.

[0071] Additionally or alternatively, the relay UE 510 may remain in the C-DRX mode on the bypass and may communicate with the BS 515 to indicate the identity of the remote UE 505 and / or provide a measurement report based at least in part on the remote UE 505 identifying the relay UE 510 for relaying. In some aspects, when the relay UE 510 is in the C-DRX mode on the Uu link, the relay UE 510 may exit the C-DRX mode on the Uu link and send a scheduling request and / or a measurement report, etc.

[0072] As in Figure 5As further shown in FIG. 5 and by reference numeral 556, the BS 515 may send a bypass setup message to the relay UE 510 and / or the remote UE 505. For example, the BS 515 may activate the relay UE 510 during the on-time of the relay UE 510 and may provide permission for the relay UE 510 to perform relaying. In this case, the BS 515 may configure resources for the relay UE 510 to perform relaying, which may cause the relay UE 510 to transition out of C-DRX mode, etc., on the Uu link and / or bypass as shown by reference numeral 558, and perform relaying as shown by reference numeral 560.

[0073] As mentioned above, Figure 5 are provided as examples. Other examples may differ from those described in Figure 5 Examples described.

[0074] Figure 6 is a diagram illustrating an example process 600 performed, for example, by a remote UE in accordance with the present disclosure. Example process 600 is an example of a remote UE (eg, UE 120, remote UE 405, and / or remote UE 505) performing operations associated with layer 2 UE relay.

[0075] like Figure 6 As shown, in some aspects, process 600 may include identifying a relay UE 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station (block 610). For example, as described above, the remote UE (e.g., using the controller / processor 280) may identify a relay UE operating in a connected discontinuous reception mode. In some aspects, the relay UE and the remote UE are connected to the base station. In some aspects, the relay UE is in a discontinuous reception mode on a first link with the base station and is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station.

[0076] like Figure 6As further shown in FIG. 6 , in some aspects, process 600 may include sending one or more layer 2 communications to a base station or receiving one or more layer 2 communications from a base station via a relay UE (block 620). For example, as described above, a remote UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, and / or antenna 252) may send one or more layer 2 communications to a base station or receive one or more layer 2 communications from a base station via a relay UE.

[0077] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0078] In a first aspect, sending one or more layer 2 communications to or receiving one or more layer 2 communications from a base station via a relay UE includes communicating with the base station via a packet data convergence protocol split bearer.

[0079] In a second aspect, alone or in combination with the first aspect, one or more links between two or more of a remote UE, a relay UE or a base station are configured by radio resource control.

[0080] 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 remote UEs, relay UEs or base stations based at least in part on link quality, resource availability, time division duplex configuration, transmit beam configuration, receive beam configuration or carrier frequency.

[0081] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 600 includes: performing a radio link monitoring process on one or more links between a remote UE and a relay UE or a remote UE and a base station; and initiating a radio link failure recovery process based at least in part on a result of performing the radio link monitoring process.

[0082] In a fifth aspect alone or in combination with one or more of the first to fourth aspects, identifying the relay UE comprises sending one or more requests for relaying, and detecting signaling identifying the availability of the relay UE for relaying.

[0083] In a sixth aspect alone or in combination with one or more of the first to fifth aspects, identifying the relay UE comprises sending information indicating that the relay UE is detected for relaying.

[0084] In the seventh aspect alone or in combination with one or more of the first to sixth aspects, the information comprises at least one of a measurement report of a link between the remote UE and the relay UE or a UE identifier.

[0085] In an eighth aspect alone or in combination with one or more of the first to seventh aspects, the process 600 includes receiving a reconfiguration message from a base station to establish a dedicated bypass with a relay UE.

[0086] although Figure 6 Example blocks of process 600 are shown, but in some aspects, process 600 may include Figure 6 The blocks described in the process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 600. Additionally or alternatively, two or more blocks in the blocks of process 600 may be executed in parallel.

[0087] Figure 7 is a diagram illustrating an example process 700 performed, for example, by a relay UE in accordance with the present disclosure. Example process 700 is an example of a relay UE (eg, UE 120, relay UE 410, and / or relay UE 510) performing operations associated with layer 2 UE relaying.

[0088] like Figure 7 As shown, in some aspects, process 700 may include: while in a connected discontinuous reception mode, identifying 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station (block 710). For example, as described above, the relay UE (e.g., using the controller / processor 280) may identify the remote UE while in a connected reception mode. In some aspects, the relay UE and the remote UE are connected to the base station. In some aspects, the relay UE is in a discontinuous reception mode on a first link with the base station and is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station.

[0089] like Figure 7 As further shown in FIG. 7 , in some aspects, process 700 may include relaying one or more layer 2 communications between a base station and a remote UE (block 720). For example, as described above, a relay UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, and / or antenna 252) may relay one or more layer 2 communications between a base station and a remote UE.

[0090] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0091] In a first aspect, relaying one or more layer 2 communications between a base station and a remote UE includes relaying the one or more layer 2 communications via a packet data convergence protocol split bearer.

[0092] In a second aspect, alone or in combination with the first aspect, one or more links between two or more of a remote UE, a relay UE or a base station are configured by radio resource control.

[0093] 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 remote UEs, relay UEs or base stations based at least in part on link quality, resource availability, time division duplex configuration, transmit beam configuration, receive beam configuration or carrier frequency.

[0094] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 700 includes: performing a radio link monitoring process on one or more links between a remote UE and a relay UE or a relay UE and a base station; and initiating a radio link failure recovery process based at least in part on a result of performing the radio link monitoring process.

[0095] In a fifth aspect alone or in combination with one or more of the first to fourth aspects, identifying the remote UE comprises receiving one or more requests for relaying from the remote UE, and sending signaling identifying the availability of the relay UE for relaying.

[0096] In a sixth aspect alone or in combination with one or more of the first to fifth aspects, one or more requests are received during a bypass discontinuous reception on time, and signaling identifying the availability of the relay UE is broadcast during the bypass discontinuous reception on time.

[0097] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, process 700 includes maintaining a connected discontinuous reception mode on a link with a base station based at least in part on identifying a remote UE.

[0098] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, process 700 includes: transitioning from a connected discontinuous reception mode to another mode on a link with a base station based at least in part on identifying a remote UE.

[0099] In the ninth aspect alone or in combination with one or more of the first to eighth aspects, identifying the remote UE comprises switching from a connected discontinuous reception mode to another mode, and sending information indicating an identity of the remote UE to a base station.

[0100] In a tenth aspect alone or in combination with one or more of the first to ninth aspects, process 700 includes receiving a reconfiguration message from a base station to establish a dedicated bypass with a remote UE.

[0101] although Figure 7 Example blocks of process 700 are shown, but in some aspects, process 700 may include Figure 7 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 700. Additionally or alternatively, two or more of the blocks in the process 700 may be performed in parallel.

[0102] Figure 8 8 is a diagram illustrating an example process 800 performed, for example, by a BS, according to the present disclosure. Example process 800 is an example of a BS (eg, BS 110, BS 415, and / or BS 515) performing operations associated with layer 2 UE relay.

[0103] like Figure 8 As shown, in some aspects, process 800 may include identifying a remote UE and a relay UE operating in a connected discontinuous reception mode, wherein the relay UE is in a discontinuous reception mode on a first link with a base station and is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station (block 810). For example, as described above, the BS (e.g., using the controller / processor 240) may identify a remote UE and a relay UE (remote UE) operating in a connected discontinuous reception mode. In some aspects, the relay UE is in a discontinuous reception mode on a first link with the base station and is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station.

[0104] like Figure 8As further shown in FIG. 8 , in some aspects, process 800 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 820). For example, as described above, the BS (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, and / or antenna 234) 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.

[0105] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include: sending one or more layer 2 communications to a remote UE via a relay UE or receiving one or more layer 2 communications from a remote UE based at least in part on configuring the one or more links (block 830). For example, as described above, the BS (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, and / or antenna 234) may send one or more layer 2 communications to a remote UE via a relay UE or receive one or more layer 2 communications from a remote UE based at least in part on configuring the one or more links.

[0106] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0107] In a first aspect, sending or receiving one or more layer 2 communications to or from a remote UE via a relay UE includes communicating with the remote UE via a packet data convergence protocol split bearer.

[0108] In a second aspect, alone or in combination with the first aspect, configuring the one or more links comprises configuring the one or more links using radio resource control.

[0109] In a third aspect, alone or in combination with one or more of the first and second aspects, configuring one or more links includes scheduling data on the one or more links based at least in part on at least one of: link quality, resource availability, time division duplex configuration, transmit beam configuration, receive beam configuration, or carrier frequency.

[0110] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 800 includes: performing a radio link monitoring process on at least one of a first link between a remote UE and a BS or a second link between a relay UE and a BS; and initiating a radio link failure recovery process based at least in part on a result of performing the radio link monitoring process.

[0111] In a fifth aspect alone or in combination with one or more of the first to fourth aspects, identifying the remote UE and the relay UE includes receiving information identifying the remote UE or the relay UE from the remote UE or the relay UE.

[0112] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, configuring one or more links includes: sending a reconfiguration message set to at least one of the relay UE or the remote UE to establish a bypass connection between the relay UE and the remote UE.

[0113] In a seventh aspect alone or in combination with one or more of the first to sixth aspects, configuring the one or more links comprises sending a grant to the relay UE.

[0114] In the eighth aspect alone or in combination with one or more of the first to seventh aspects, configuring the one or more links includes configuring grants on the one or more links.

[0115] In a ninth aspect alone or in combination with one or more of the first to eighth aspects, configuring the one or more links comprises configuring the relay UE during an on-time of the relay UE.

[0116] In the tenth aspect alone or in combination with one or more of the first to ninth aspects, the information comprises at least one of a discovery indication or a measurement report of a bypass between the remote UE and the relay UE.

[0117] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 800 includes determining to activate relay based at least in part on information from a remote UE or a relay UE.

[0118] although Figure 8 An example block diagram of process 800 is shown, but in some aspects, process 800 may include Figure 8 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 800. Additionally or alternatively, two or more blocks in the blocks of process 800 may be performed in parallel.

[0119] The following provides an overview of some aspects of the disclosure:

[0120] Aspect 1: A method for wireless communication performed by a remote user equipment (UE), comprising: identifying a relay UE 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control of the base station; and sending one or more layer 2 communications to the base station or receiving one or more layer 2 communications from the base station via the relay UE.

[0121] Aspect 2: According to the method of aspect 1, sending one or more layer 2 communications to the base station or receiving one or more layer 2 communications from the base station via the relay UE includes: communicating with the base station via a packet data convergence protocol split bearer.

[0122] Aspect 3: A method according to any one of Aspects 1-2, wherein data is scheduled on one or more links between two or more of remote UEs, relay UEs, or base stations based at least in part on link quality, resource availability, time division duplex configuration, transmit beam configuration, receive beam configuration, or carrier frequency.

[0123] Aspect 4: The method according to any one of Aspects 1-3 further includes: performing a radio link monitoring process on one or more links between a remote UE and a relay UE or a remote UE and a base station; and initiating a radio link failure recovery process based at least in part on the result of performing the radio link monitoring process.

[0124] Aspect 5: The method according to any one of aspects 1-4, wherein identifying the relay UE comprises: sending one or more requests for relaying; and detecting signaling identifying the availability of the relay UE for relaying.

[0125] Aspect 6: The method according to aspect 5, wherein identifying the relay UE includes: sending information indicating that the relay UE is detected for relaying.

[0126] Aspect 7: The method according to aspect 6, wherein the information includes at least one of a measurement report of a link between a remote UE and a relay UE, or a UE identifier.

[0127] Aspect 8: The method according to any one of aspects 1-7 further includes: receiving a reconfiguration message from a base station to establish a dedicated bypass with the relay UE.

[0128] Aspect 9: A method for wireless communication performed by a relay user equipment (UE), comprising: identifying a remote UE while being 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control by the base station; and one or more layer 2 communications between the relay base station and the remote UE.

[0129] Aspect 10: The method according to aspect 9, wherein relaying one or more layer 2 communications between the base station and the remote UE includes: relaying the one or more layer 2 communications via a packet data convergence protocol split bearer.

[0130] Aspect 11: A method according to any one of Aspects 9-10, wherein data is scheduled on one or more links between two or more of remote UEs, relay UEs, or base stations based at least in part on link quality, resource availability, time division duplex configuration, transmit beam configuration, receive beam configuration, or carrier frequency.

[0131] Aspect 12: The method according to any one of Aspects 9-11 further includes: performing a radio link monitoring process on one or more links between a remote UE and a relay UE or a relay UE and a base station; and initiating a radio link failure recovery process based at least in part on the result of performing the radio link monitoring process.

[0132] Aspect 13: The method according to any one of aspects 9-12, wherein identifying the remote UE comprises: receiving one or more requests for relaying from the remote UE; and sending signaling identifying the availability of the relay UE for relaying.

[0133] Aspect 14: The method according to aspect 13, wherein the one or more requests are received during a bypass discontinuous reception on time, and signaling identifying the availability of the relay UE is broadcast during the bypass discontinuous reception on time.

[0134] Aspect 15: The method according to any one of aspects 9-14 further comprises: maintaining a connected discontinuous reception mode on a link with the base station based at least in part on identifying the remote UE.

[0135] Aspect 16: The method according to any of aspects 9-14, further comprising: switching from a connected discontinuous reception mode to another mode on a link with the base station based at least in part on identifying the remote UE.

[0136] Aspect 17: The method according to any one of aspects 9-16, wherein identifying the remote UE comprises: switching from a connected discontinuous reception mode to another mode; and sending information indicating the identity of the remote UE to the base station.

[0137] Aspect 18: The method according to any one of aspects 9-17 further comprises: receiving a reconfiguration message from a base station to establish a dedicated bypass with a remote UE.

[0138] Aspect 19: A method of wireless communication performed by a base station, comprising: identifying a remote user equipment (UE) and a relay UE 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 is in a discontinuous reception mode or an active mode on a bypass 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 configured by radio resource control of the base station; configuring 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 identifying the remote UE and the relay UE; and sending one or more layer 2 communications to the remote UE via the relay UE or receiving one or more layer 2 communications from the remote UE based at least in part on configuring the one or more links.

[0139] Aspect 20: The method according to aspect 19, wherein sending one or more layer 2 communications to the remote UE or receiving one or more layer 2 communications from the remote UE via the relay UE includes: communicating with the remote UE via a packet data convergence protocol split bearer.

[0140] Aspect 21: The method according to any one of aspects 19-20, wherein configuring one or more links includes: configuring the one or more links using radio resource control.

[0141] Aspect 22: A method according to any one of Aspects 19-21, wherein configuring one or more links includes: scheduling data on one or more links based at least in part on at least one of the following: link quality, resource availability, time division duplex configuration, transmit beam configuration, receive beam configuration, or carrier frequency.

[0142] Aspect 23: The method according to any one of Aspects 19-22 further includes: performing a radio link monitoring process on at least one of the first link between the remote UE and the base station or the second link between the relay UE and the base station; and initiating a radio link failure recovery process based at least in part on the result of performing the radio link monitoring process.

[0143] Aspect 24: The method according to any one of aspects 19-23, wherein identifying the remote UE and the relay UE includes: receiving information identifying the remote UE or the relay UE from the remote UE or the relay UE.

[0144] Aspect 25: The method according to aspect 24, wherein the information includes at least one of a discovery indication or a measurement report of a bypass between the remote UE and the relay UE.

[0145] Aspect 26: The method according to any one of aspects 24-25 further comprises: determining to activate the relay based at least in part on information from the remote UE or the relay UE.

[0146] Aspect 27: A method according to any one of Aspects 19-26, wherein configuring one or more links includes: sending a reconfiguration message set to at least one of the relay UE or the remote UE to establish a bypass connection between the relay UE and the remote UE.

[0147] Aspect 28: The method according to any one of aspects 19-27, wherein configuring one or more links includes: sending a grant to the relay UE.

[0148] Aspect 29: The method according to any one of aspects 19-28, wherein configuring one or more links includes: configuring grants on the one or more links.

[0149] Aspect 30: The method according to any one of aspects 19-29, wherein configuring one or more links includes: configuring the relay UE during an on time of the relay UE.

[0150] Aspect 31: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to enable the apparatus to perform the method of one or more aspects of Aspects 1-8 and / or Aspects 9-18.

[0151] Aspect 32: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, wherein the memory and the one or more processors are configured to perform the method of one or more aspects of aspects 1-8 and / or aspects 9-18.

[0152] Aspect 33: An apparatus for wireless communication, comprising at least one apparatus for performing the method of one or more of Aspects 1-8 and / or Aspects 9-18.

[0153] Aspect 34: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of aspects 1-8 and / or aspects 9-18.

[0154] Aspect 35: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions, which, when executed by one or more processors of a device, causes the device to perform one or more methods of Aspects 1-8 and / or Aspects 9-18.

[0155] Aspect 36: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more aspects of aspects 19-30.

[0156] Aspect 37: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, wherein the memory and the one or more processors are configured to perform the method of one or more aspects of aspects 19-30.

[0157] Aspect 38: An apparatus for wireless communication, comprising at least one apparatus for performing the method of one or more aspects of aspects 19-30.

[0158] Aspect 39: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 19-30.

[0159] Aspect 40: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more methods of aspects 19-30.

[0160] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the various aspects.

[0161] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware and / or hardware and software. "Software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, processes and / or functions and other examples, whether it is referred to as software, firmware, middleware, microcode, hardware description language or other terms. As used herein, the processor is implemented with a combination of hardware and / or hardware and software. It is obvious that the system and / or method described herein can be implemented with a combination of hardware and / or hardware and software in different forms. The actual dedicated control hardware or software code for implementing these systems and / or methods does not limit these aspects. Therefore, the operation and behavior of the system and / or method are described herein without reference to specific software codes--it should be understood that software and hardware can be designed to implement the system and / or method based at least in part on the description herein.

[0162] As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0163] Even if a specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically recorded in the claims and / or disclosed in the specification. Although each dependent claim listed below may be directly subordinate to only one claim, the disclosure of various aspects includes the combination of each dependent claim with each other claim in the claim set. As used herein, the phrase "at least one" referring to the list of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other order of a, b and c).

[0164] Unless clearly described, the elements, actions or instructions used herein should not be interpreted as key or necessary. In addition, as used herein, nouns are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more projects quoted in conjunction with the article "said", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more projects (for example, a combination of related projects, unrelated projects or related and unrelated projects). In the case of only expecting one project, the phrase "only one" or similar language is used. In addition, as used herein, the terms "have", "have", "just have" etc. are intended to be open terms. In addition, unless otherwise clearly stated, the phrase "based on" is intended to mean "based at least in part". In addition, as used herein, unless otherwise clearly stated (for example, if used in combination with "any one" or "only one"), the term "or" is intended to be inclusive when used in connection, and can be used interchangeably with "and / or".

Claims

1. A method of wireless communication performed by a remote user equipment (UE), comprising: identifying a relay UE operating in connected discontinuous reception mode, Among them, the relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE or the base station are configured by radio resource control of the base station; and Based at least in part on the relay UE transitioning to another mode other than the connected discontinuous reception mode on the link with the base station, one or more layer 2 communications are sent to or received from a base station via the relay UE.

2. The method according to claim 1, wherein: Sending one or more layer 2 communications to a base station or receiving one or more layer 2 communications from a base station via a relay UE includes: Communicate with the base station via a packet data convergence protocol split bearer.

3. The method according to claim 1, further comprising: performing a radio link monitoring procedure on one or more links between a remote UE and a relay UE or a remote UE and a base station; as well as A radio link failure recovery procedure is initiated based at least in part on a result of performing the radio link monitoring procedure.

4. The method according to claim 1, wherein: Identifying a relay UE includes: sending one or more requests to the relay; and Signaling identifying the availability of the relay UE for relaying is detected.

5. The method according to claim 4, wherein: Identifying the relay UE includes: Information indicating that a relay UE is detected for relaying is sent.

6. The method according to claim 5, wherein: The information includes at least one of the following: A measurement report of the link between the remote UE and the relay UE, or UE identifier.

7. The method according to claim 1, further comprising: A reconfiguration message is received from the base station to establish a dedicated bypass with the relay UE.

8. A method of wireless communication performed by a relay user equipment (UE), comprising: While in connected discontinuous reception mode, identifying a remote UE, Among them, the relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control by the base station; switching from the connected discontinuous reception mode to another mode different from the connected discontinuous reception mode on the link with the base station; and Based on the transition to the another mode over the link with the base station, one or more layer 2 communications between a base station and a remote UE are relayed.

9. The method according to claim 8, wherein: One or more layer 2 communications between the relay base station and the remote UE include: The one or more layer 2 communications are relayed via a packet data convergence protocol split bearer.

10. The method according to claim 8, further comprising: performing a radio link monitoring procedure on one or more links between a remote UE and a relay UE or a relay UE and a base station; as well as A radio link failure recovery procedure is initiated based at least in part on a result of performing the radio link monitoring procedure.

11. The method according to claim 8, wherein: Identifying a remote UE includes: receiving one or more requests for relaying from a remote UE; and Signaling is sent identifying the availability of the relay UE for relaying.

12. The method according to claim 11, wherein: One or more requests are received during the bypass discontinuous reception on time, and signaling identifying the availability of the relay UE is broadcast during the bypass discontinuous reception on time.

13. The method according to claim 8, further comprising: maintaining a connected discontinuous reception mode on the link with the base station based at least in part on identifying the remote UE; and Wherein, switching from the connected discontinuous reception mode to the other mode on the link with the base station comprises: Based at least in part on one or more resources being configured for relaying, transitioning from the connected discontinuous reception mode to the another mode on the link with the base station.

14. The method of claim 8, switching from the connected discontinuous reception mode to the another mode on the link with the base station comprises: Based at least in part on identifying the remote UE, transitioning from a connected discontinuous reception mode to the another mode on the link with the base station.

15. The method according to claim 8, further comprising: Information indicating an identity of the remote UE is sent to the base station.

16. The method according to claim 8, further comprising: A reconfiguration message is received from a base station to establish a dedicated bypass with a remote UE.

17. A remote user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors, coupled to the memory, configured to cause the remote UE to: identifying a relay UE operating in connected discontinuous reception mode, Among them, the relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE or the base station are configured by radio resource control of the base station; and Based at least in part on the relay UE transitioning to another mode other than the connected discontinuous reception mode on the link with the base station, one or more layer 2 communications are sent to or received from a base station via the relay UE.

18. The remote UE according to claim 17, wherein: The one or more processors are further configured to cause the relay UE to: performing a radio link monitoring procedure on one or more links between a remote UE and a relay UE or a remote UE and a base station; and A radio link failure recovery procedure is initiated based at least in part on a result of performing the radio link monitoring procedure.

19. The remote UE according to claim 17, wherein: To identify the relay UE, the one or more processors are configured to cause the relay UE to: sending one or more requests to the relay; and Signaling identifying the availability of the relay UE for relaying is detected.

20. The remote UE according to claim 19, wherein: To identify the relay UE, the one or more processors are configured to cause the relay UE to: Information indicating that a relay UE is detected for relaying is sent.

21. The remote UE according to claim 20, wherein: The information includes at least one of the following: A measurement report of the link between the remote UE and the relay UE, or UE identifier.

22. The remote UE according to claim 17, wherein: The one or more processors are further configured to cause the relay UE to: A reconfiguration message is received from the base station to establish a dedicated bypass with the relay UE.

23. A relay user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors, coupled to the memory, are configured to cause the relay UE to: While in connected discontinuous reception mode, identifying a remote UE, Among them, the relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE or the base station are configured by radio resource control of the base station; switching from the connected discontinuous reception mode to another mode different from the connected discontinuous reception mode on the link with the base station; and Based on the transition to the another mode over the link with the base station, one or more layer 2 communications between a base station and a remote UE are relayed.

24. The relay UE according to claim 23, wherein: The one or more processors are further configured to cause the relay UE to: performing a radio link monitoring procedure on one or more links between a remote UE and a relay UE or a relay UE and a base station; and A radio link failure recovery procedure is initiated based at least in part on a result of performing the radio link monitoring procedure.

25. The relay UE according to claim 23, wherein: To identify the remote UE, the one or more processors are configured to cause the relay UE to: receiving one or more requests for relaying from a remote UE; and Signaling is sent identifying the availability of the relay UE for relaying.

26. The relay UE according to claim 25, wherein: One or more requests are received during the bypass discontinuous reception on time, and signaling identifying the availability of the relay UE is broadcast during the bypass discontinuous reception on time.

27. The relay UE according to claim 23, wherein: The one or more processors are further configured to cause the relay UE to: Based at least in part on identifying the remote UE, maintaining a connected discontinuous reception mode on the link with the base station; and Wherein, in order to switch from the connected discontinuous reception mode to the other mode on the link with the base station, the one or more processors are configured to enable the relay UE: Based at least in part on one or more resources being configured for relaying, transitioning from the connected discontinuous reception mode to the another mode on the link with the base station.

28. The relay UE according to claim 23, wherein: In order to switch from the connected discontinuous reception mode to the other mode on the link with the base station, the one or more processors are configured to cause the relay UE to: Based at least in part on identifying the remote UE, transitioning from a connected discontinuous reception mode to the another mode on the link with the base station.

29. The relay UE according to claim 23, wherein: The one or more processors are further configured to cause the relay UE to: Information indicating an identity of the remote UE is sent to the base station.

30. The relay UE according to claim 23, wherein: The one or more processors are further configured to cause the relay UE to: A reconfiguration message is received from a base station to establish a dedicated bypass with a remote UE.

31. A non-transitory computer-readable storage medium having stored thereon one or more instructions for wireless communication, the one or more instructions being executed by one or more processors of a remote user equipment (UE) to: identifying a relay UE operating in connected discontinuous reception mode, in, The relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE or the base station are configured by radio resource control of the base station; and Based at least in part on the relay UE transitioning to another mode other than the connected discontinuous reception mode on the link with the base station, one or more layer 2 communications are sent to or received from a base station via the relay UE.

32. A non-transitory computer-readable storage medium having stored thereon one or more instructions for wireless communication, the one or more instructions being executed by one or more processors of a relay user equipment (UE) to: While in connected discontinuous reception mode, identifying a remote UE, in, The relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control by the base station; switching from the connected discontinuous reception mode to another mode different from the connected discontinuous reception mode on the link with the base station; and Based on the transition to the another mode over the link with the base station, one or more layer 2 communications between a base station and a remote UE are relayed.

33. An apparatus for wireless communication, comprising: means for identifying a relay user equipment (UE) operating in a connected discontinuous reception mode, Among them, the relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE or the base station are configured by radio resource control of the base station; and Means for sending or receiving one or more layer 2 communications to or from a base station via a relay UE based at least in part on the relay UE transitioning to another mode different from the connected discontinuous reception mode on the link with the base station.

34. An apparatus for wireless communication, comprising: means for identifying a remote user equipment (UE) while in a connected discontinuous reception mode, Among them, the relay UE and the remote UE are connected to the base station, The relay UE is in the connection discontinuous reception mode on the link with the base station, and wherein one or more links between two or more of the remote UE, the relay UE, or the base station are configured by radio resource control by the base station; means for switching from said connected discontinuous reception mode to another mode different from said connected discontinuous reception mode on said link with said base station; and Means for relaying one or more layer 2 communications between a base station and a remote UE based on transitioning to said another mode over said link with said base station.

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