Sidelink synchronization rules based on network energy saving mode

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. The UE may receive a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes. The UE may perform sidelink synchronization according to a priority rule of the plurality of priority rules for sidelink synchronization based at least in part on the scheduling for the one or more network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization. Numerous other aspects are described.

Description

[0001] Cross - Reference to Related Applications

[0002] This patent application claims priority to U.S. Non - Provisional Patent Application No. 18 / 064,751, filed on December 12, 2022, entitled "SIDE - LINK SYNCHRONIZATION RULES BASED ON NETWORK ENERGY SAVING MODE", which is hereby incorporated by reference in its entirety. Technical Field

[0003] Aspects of the present disclosure generally relate to wireless communication and relate to techniques and apparatuses for side - link synchronization based on network energy saving mode. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access techniques 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 / Advanced LTE is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless network may include one or more network nodes that support communication for wireless communication devices such as User Equipment (UE) or multiple UEs. The UE may communicate with the network node via downlink communication and uplink communication. "Downlink" (or "DL") refers to the communication link from the network node to the UE, and "uplink" (or "UL") refers to the communication link from the UE to the network node. Some wireless networks may support device - to - device communication, such as via local links (e.g., side - link (SL), Wireless Local Area Network (WLAN) link, and / or Wireless Personal Area Network (WPAN) link, etc.).

[0006] The above multi-access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at the urban, national, regional, and / or global levels. New Radio (NR) (which may be referred to as 5G) is an enhanced set of the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access in the following ways: improving spectral efficiency; reducing costs; enhancing services; leveraging new spectrums; and better integrating with other open standards by using Orthogonal Frequency Division Multiplexing with Cyclic Prefix (CP-OFDM) on the downlink, CP-OFDM and / or Single Carrier Frequency Division Multiplexing (SC-FDM) (also known as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)) on the uplink; and supporting beamforming, Multiple-Input Multiple-Output (MIMO) antenna technology, and carrier aggregation. With the continuous increase in the demand for mobile broadband access, further improvements in LTE, NR, and other radio access technologies are still useful. SUMMARY OF THE INVENTION

[0007] Some aspects described herein relate to a User Equipment (UE) for wireless communication. The UE may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to receive a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. The one or more processors may be configured to receive a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes. The one or more processors may be configured to perform sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for the one or more network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

[0008] Some aspects described herein relate to a network node for wireless communication. The network node may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to send a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a UE. The one or more processors may be configured to send a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes.

[0009] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include receiving a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. The method may include receiving a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes. The method may include performing sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for one or more of the network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

[0010] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include sending a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a UE. The method may include sending a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes.

[0011] Some aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes. The set of instructions, when executed by one or more processors of the UE, may cause the UE to perform sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for one or more of the network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

[0012] Some aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a network node. The set of instructions, when executed by one or more processors of the network node, may cause the network node to send a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a UE. The set of instructions, when executed by one or more processors of the network node, may cause the network node to send a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes.

[0013] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. The apparatus may include means for receiving a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes. The apparatus may include means for performing sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for one or more of the network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

[0014] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a UE. The apparatus may include means for transmitting a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes.

[0015] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, network entities, network nodes, wireless communication devices, and / or processing systems as fully described herein with reference to the figures and the specification and as illustrated in the figures and the specification.

[0016] The features and technical advantages of examples in accordance with the present disclosure have been outlined above rather broadly in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes 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 as to their organization and operation methods, as well as the associated advantages, will be better understood by considering the following description in conjunction with the accompanying figures. Each of the figures provided is for the purpose of illustration and description and not as a definition of the limits of the claims.

[0017] Although aspects are described herein by way of illustration of some examples, those skilled in the art will understand that such aspects can be implemented in many different arrangements and scenarios. The techniques 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 an integrated chip implementation or other non-module component-based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / shopping devices, medical devices, and / or artificial intelligence devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices incorporating the described aspects and features can include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals can include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and / or summers). The aspects described herein are intended to be practiced in a wide variety of devices, components, systems, distributed arrangements, and / or end-user devices of various sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To enable a detailed understanding of the above features of the present disclosure, a more specific description of what was briefly outlined above can be obtained by reference to aspects, some of which are illustrated in the drawings. It should be noted, however, that the drawings only illustrate certain typical aspects of the present disclosure and are therefore not considered to be a limitation of its scope, as the specification may admit other equally valid aspects. The same reference numerals in different drawings can identify the same or similar elements.

[0019] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0020] Figure 2 is a diagram illustrating an example of a network node communicating with a user equipment (UE) in a wireless network according to the present disclosure.

[0021] Figure 3 is a diagram illustrating an example of sidelink communication according to the present disclosure.

[0022] Figure 4 is a diagram illustrating an example of sidelink communication and access link communication according to the present disclosure.

[0023] Figure 5 is a diagram illustrating an example of sidelink synchronization according to the present disclosure.

[0024] Figure 6 is a diagram illustrating an example of priority rules for sidelink synchronization according to the present disclosure.

[0025] Figure 7 is a diagram illustrating an example of a network energy saving (NES) mode according to the present disclosure.

[0026] Figure 8 is a diagram illustrating an example associated with sidelink synchronization based on the NES mode according to the present disclosure.

[0027] Figure 9 is a diagram illustrating an example process, such as performed by a UE, according to the present disclosure.

[0028] Figure 10 is a diagram illustrating an example process, such as performed by a network node, according to the present disclosure.

[0029] Figures 11 to 12 is a diagram of an example apparatus for wireless communication according to the present disclosure. Detailed Description

[0030] Aspects of the present disclosure are described more fully hereinafter with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Those skilled in the art should understand that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, any number of the aspects set forth herein may be used to implement an apparatus or practice a method. Additionally, the scope of the present disclosure is intended to cover such an apparatus or method practiced using other structures, functionality, or a combination of structures and functionality in addition to or different from the aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the present invention.

[0031] Several aspects of a telecommunications system will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0032] While terms associated with 5G or New Radio (NR) radio access technology (RAT) may be used herein to describe aspects, aspects of the present disclosure may be applicable to other RATs, such as 3G RAT, 4G RAT, and / or post-5G (e.g., 6G) RATs.

[0033] Figure 1 FIG. is an example diagram illustrating a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, or may include elements of a 5G (e.g., NR) network and / or elements of a 4G (e.g., Long Term Evolution (LTE)) network, and so on. The wireless network 100 may include one or more network nodes 110 (shown as network nodes 110a, network nodes 110b, network nodes 110c, and network nodes 110d), a user equipment (UE) 120 or multiple UEs 120 (shown as UEs 120a, UEs 120b, UEs 120c, UEs 120d, and UEs 120e), and / or other entities. The network nodes 110 are network nodes that communicate with the UEs 120. As shown, the network nodes 110 may include one or more network nodes. For example, the network node 110 may be an aggregated network node, which means that the aggregated network node is configured to utilize a radio protocol stack physically or logically integrated within a single radio access network (RAN) node (e.g., within a single device or unit). As another example, the network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station), which means that the network node 110 is configured to utilize a protocol stack physically or logically distributed between two or more nodes, such as one or more central units (CUs), one or more distributed units (DUs), or one or more radio units (RUs).

[0034] In some examples, network node 110 is or includes a network node (such as a RU) that communicates with UE 120 via a radio access link. In some examples, network node 110 is or includes a network node (such as a DU) that communicates with other network nodes 110 via a fronthaul link or a midhaul link. In some examples, network node 110 is or includes a network node (such as a CU) that communicates with other network nodes 110 via a midhaul link or communicates with a core network via a backhaul link. In some examples, network node 110 (such as an aggregated network node 110 or a disaggregated network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. Network node 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, a transmission and reception point (TRP), a DU, a RU, a CU, a mobility element of the network, a core network node, a network element, network equipment, a RAN node, or a combination thereof. In some examples, network nodes 110 may be interconnected with each other or to one or more other network nodes 110 in the wireless network 100 using any suitable transport network via various types of fronthaul interfaces, midhaul interfaces, and / or backhaul interfaces (such as direct physical connections, air interfaces, or virtual networks).

[0035] In some examples, network node 110 may provide communication coverage for a specific geographical area. In the 3rd Generation Partnership Project (3GPP), depending on the context in which the term is used, the term "cell" may refer to the coverage area of network node 110 and / or the network node subsystem serving that coverage area. Network node 110 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 geographical area (e.g., with a radius of several kilometers) and may allow unrestricted access by UE 120 having a service subscription. A pico cell may cover a relatively small geographical area and may allow unrestricted access by UE 120 having a service subscription. A femto cell may cover a relatively small geographical area (e.g., a home) and may allow restricted access by UE 120 associated with the femto cell (e.g., UE 120 in a Closed Subscriber Group (CSG)). The network node 110 for a macro cell may be referred to as a macro network node. The network node 110 for a pico cell may be referred to as a pico network node. The network node 110 for a femto cell may be referred to as a femto network node or a home network node. In Figure 1In the example shown, network node 110a can be a macro network node for macro cell 102a, network node 110b can be a pico network node for pico cell 102b, and network node 110c can be a femto network node for femto cell 102c. A network node can support one or more (e.g., three) cells. In some examples, a cell may not necessarily be stationary, and the geographical area of a cell can move according to the location of a moving network node 110 (e.g., a mobile network node).

[0036] In some aspects, the term "base station" or "network node" can refer to an aggregated base station, a disaggregated base station, an integrated access and backhaul (IAB) node, a relay node, or one or more of their components. For example, in some aspects, a "base station" or "network node" can refer to a CU, a DU, an RU, a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network node" can refer to a single device configured to perform one or more functions (such as those described herein in connection with network node 110). In some aspects, the term "base station" or "network node" can refer to multiple devices configured to perform one or more functions. For example, in some distributed systems, each of multiple different devices (which can be located at the same geographical location or different geographical locations) can be configured to perform at least a portion of a function, or to repeat at least a portion of the function, and the term "base station" or "network node" can refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" can refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions can be instantiated on a single device. In some aspects, the term "base station" or "network node" can refer to one base station function among base station functions, rather than another base station function. In this way, a single device can include more than one base station.

[0037] Wireless network 100 can include one or more relay stations. A relay station is a network node that can receive a transmission of data from an upstream node (e.g., network node 110 or UE 120) and transmit the data to a downstream node (e.g., UE 120 or network node 110). A relay station can be a UE 120 that can relay transmissions for other UEs 120. In Figure 1 the example shown, network node 110d (e.g., a relay network node) can communicate with network node 110a (e.g., a macro network node) and UE 120d to facilitate communication between network node 110a and UE 120d. A network node that relays communication can be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay, etc.

[0038] The wireless network 100 can be a heterogeneous network that includes different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, etc. These different types of network nodes 110 can have different transmission power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, a macro network node can have a high transmission power level (e.g., 5 watts to 40 watts), while pico network nodes, femto network nodes, and relay network nodes can have lower transmission power levels (e.g., 0.1 watt to 2 watts).

[0039] The network controller 130 can be coupled to or communicate with a group of network nodes 110 and can provide coordination and control for these network nodes 110. The network controller 130 can communicate with the network nodes 110 via a backhaul communication link or a midhaul communication link. The network nodes 110 can communicate directly with each other or indirectly via a wireless backhaul communication link or a wired backhaul communication link. In some aspects, the network controller 130 can be a CU or a core network device, or can include a CU or a core network device.

[0040] UEs 120 can be dispersed throughout the wireless network 100, and each UE 120 can be stationary or mobile. The UE 120 can include, for example, an access terminal, a terminal, a mobile station, and / or a subscriber unit. The UE 120 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 computer, a camera, a gaming device, a netbook, a smartbook, a superbook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, UE functionality of a network node, and / or any other suitable device configured to communicate via a wireless or wired medium.

[0041] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. The MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which may communicate with network nodes, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices and / or may be implemented as narrowband IoT (NB-IoT) devices. Some UEs 120 may be considered as customer premise equipment. The UE 120 may be included inside a housing that houses components of the UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, the processor component (e.g., one or more processors) and the memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0042] Generally, any number of radio networks 100 may be deployed in a given geographical area. Each radio network 100 may support a specific RAT and may operate on one or more frequencies. The RAT may be referred to as a radio technology, an air interface, etc. The frequency may be referred to as a carrier, a frequency channel, etc. Each frequency in a given geographical area may support a single RAT to avoid interference between radio networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0043] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., communicate with each other without using the network node 110 as an intermediate device). For example, the UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or a mesh network. In such examples, the UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the network node 110.

[0044] Devices of the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, frequency bands, channels, etc. according to frequency or wavelength. For example, devices of the wireless network 100 can communicate using one or more operating frequency bands. In 5G NR, two initial operating frequency bands have been identified as Frequency Range Designation FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz). It should be understood that although a part of FR1 is greater than 6 GHz, in various documents and articles, FR1 is usually (interchangeably) referred to as the "sub-6 GHz" band. Regarding FR2, a similar naming issue sometimes occurs, which is usually (interchangeably) referred to as the "millimeter wave" band in documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified by the International Telecommunication Union (ITU) as the "millimeter wave" band.

[0045] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified operating frequency bands for these mid-band frequencies as Frequency Range Designation FR3 (7.125 GHz - 24.25 GHz). Bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and thus can effectively extend the features of FR1 and / or FR2 to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating frequency bands have been identified as Frequency Range Designation FR4a or FR4-1 (52.6 GHz to 71 GHz), FR4 (52.6 GHz to 114.25 GHz), and FR5 (114.25 GHz to 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0046] Considering the above examples, unless otherwise specifically stated, it should be understood that if the term "sub-6 GHz" etc. is used in this article, this term can generally represent frequencies that can be below 6 GHz, can be within FR1, or can include mid-band frequencies. Additionally, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" etc. is used in this article, this term can generally represent frequencies that can include mid-band frequencies, can be within FR2, FR4, FR4-a or FR4-1 and / or FR5, or can be within the EHF band. It is envisioned that the frequencies included in these operating frequency bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1 and / or FR5) can be modified, and the technologies described in this article apply to those modified frequency ranges.

[0047] In some aspects, UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may receive a mapping indication indicating a mapping between multiple network energy saving (NES) modes and multiple priority rules for sidelink synchronization; receive an NES mode indication indicating a schedule for one or more of the multiple NES modes; and perform sidelink synchronization according to a priority rule among the multiple priority rules for sidelink synchronization, at least in part based on the schedule for one or more of the NES modes and the mapping between the multiple NES modes and the multiple priority rules for sidelink synchronization. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0048] In some aspects, network node 110 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may send a mapping indication indicating a mapping between multiple NES modes and multiple priority rules for sidelink synchronization by a UE; and send an NES mode indication indicating a schedule for one or more of the multiple NES modes. Additionally or alternatively, the communication manager 150 may perform one or more other operations described herein.

[0049] As indicated above, Figure 1 is provided as an example. Other examples may be different from the example described with respect to Figure 1 the example described.

[0050] Figure 2 FIG. 200 is a diagram illustrating an example 200 of communication between network node 110 and UE 120 in a wireless network 100 according to the present disclosure. Network node 110 may be equipped with a set of antennas 234a through 234t, such as T antennas (T≥1). UE 120 may be equipped with a set of antennas 252a through 252r, such as R antennas (R≥1). Network node 110 of example 200 includes one or more radio frequency components, such as antenna 234 and modem 232. In some examples, network node 110 may include an interface, a communication component, or another component that facilitates communication with UE 120 or another network node. Some network nodes 110 may not include radio frequency components that facilitate direct communication with UE 120, such as one or more CUs or one or more DUs.

[0051] At network node 110, transmit processor 220 may receive data destined for UE 120 (or a group of UEs 120) from data source 212. Transmit processor 220 may select one or more modulation and coding schemes (MCSs) for UE 120 based at least in part on one or more channel quality indicators (CQIs) received from UE 120. Network node 110 may process (e.g., encode and modulate) data for UE 120 based at least in part on the MCS selected for UE 120 and may provide data symbols for UE 120. Transmit processor 220 may process system information (e.g., for semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and control symbols. Transmit processor 220 may generate reference symbols for reference signals (e.g., cell-specific reference signal (CRS) or demodulation reference signal (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems) (shown as modems 232a through 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of modem 232. Each modem 232 may process the corresponding output symbol stream (e.g., for OFDM) using the corresponding modulator component to obtain a stream of output samples. Each modem 232 may also process the stream of output samples (e.g., convert to analog, amplify, filter, and / or up-convert) using the corresponding modulator component to obtain a downlink signal. Modems 232a through 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) (shown as antennas 234a through 234t).

[0052] At the UE 120, a set of antennas 252 (shown as antennas 252a through 252r) may receive downlink signals from the network node 110 and / or other network nodes 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) (shown as modems 254a through 254r). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may condition (e.g., filter, amplify, down-convert, and / or digitize) the received signal using the corresponding demodulator component to obtain input samples. Each modem 254 may further process the input samples (e.g., for OFDM) using the demodulator component to obtain received symbols. The MIMO detector 256 may obtain the received symbols from the modems 254, may perform MIMO detection on the received symbols when applicable, and may provide the detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide the decoded data for the UE 120 to the data sink 260, and may provide the decoded control information and system information to the 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 reference signal received power (RSRP) parameters, received signal strength indicator (RSSI) parameters, reference signal received quality (RSRQ) parameters, and / or CQI parameters, etc. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0053] 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 network node 110 via the communication unit 294.

[0054] One or more antennas (e.g., antennas 234a through 234t and / or antennas 252a through 252r) may include one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, etc., or may be included within one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, etc. The antenna panel, antenna group, set of antenna elements, and / or antenna array may include one or more antenna elements (in a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, and / or one or more antenna elements coupled to one or more transmit and / or receive components (such as Figure 2 one or more components in)

[0055] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-coded by the TX MIMO processor 266 when applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and sent to the network node 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, and / or the TX MIMO processor 266. The transceiver may be used by a processor (e.g., the controller / processor 280) and the memory 282 to perform aspects of any of the methods described herein (e.g., with reference to Figures 8 to 12 ) described herein.

[0056] At the network node 110, the uplink signals from the UE 120 and / or other UEs may be received by the antenna 234, processed by the modem 232 (e.g., the demodulator component of the modem 232 shown as DEMOD), detected by the MIMO detector 236 when applicable, and further processed by the receive processor 238 to obtain the decoded data and control information transmitted 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 network node 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network node 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink communication and / or uplink communication. In some examples, the modem 232 of the network node 110 may include a modulator and a demodulator. In some examples, the network node 110 includes a transceiver. The transceiver may include any combination of the antenna 234, the modem 232, the MIMO detector 236, the receive processor 238, the transmit processor 220, and / or the TX MIMO processor 230. The transceiver may be used by a processor (e.g., the controller / processor 240) and the memory 242 to perform aspects of any of the methods described herein (e.g., with reference to Figures 8 to 12 ) described herein.

[0057] The controller / processor 240 of network node 110, the controller / processor 280 of UE 120, and / or Figure 2 any other component of may perform one or more techniques associated with NES mode-based sidelink synchronization, as described in more detail elsewhere herein. For example, the controller / processor 240 of network node 110, the controller / processor 280 of UE 120, and / or Figure 2 any other component of may execute or direct, for example Figure 9 process 900 of, Figure 10 process 1000 of, and / or the operation of other processes as described herein. The memories 242 and 282 may store data and program code for network node 110 and UE 120, respectively. In some examples, memories 242 and / or 282 may include non-transitory computer-readable media storing one or more instructions for wireless communication (e.g., code and / or program code). For example, when executed by one or more processors of network node 110 and / or UE 120 (e.g., directly executed, or after compilation, transformation, and / or interpretation), the one or more instructions may cause the one or more processors, UE 120, and / or network node 110 to execute or direct, for example Figure 9 process 900 of, Figure 10 process 1000 of, and / or the operation of other processes as described herein. In some examples, executing the instructions may include running the instructions, transforming the instructions, compiling the instructions, and / or interpreting the instructions, etc.

[0058] In some aspects, a UE (e.g., UE 120) includes means for receiving a mapping indication indicating a mapping between a plurality of NES modes and a plurality of priority rules for sidelink synchronization; means for receiving a NES mode indication indicating a schedule for one or more of the plurality of NES modes; and / or means for performing sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for one or more of the NES modes and the mapping between the plurality of NES modes and the plurality of priority rules for sidelink synchronization. The means for a UE to perform the operations described herein may include, for example, one or more of the following: communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0059] In some aspects, a network node (e.g., network node 110) includes components for sending a mapping indication indicating a mapping between multiple NES modes and multiple priority rules for sidelink synchronization by a UE; and / or components for sending a NES mode indication indicating scheduling for one or more of the multiple NES modes. The components for the network node to perform the operations described herein may include, for example, one or more of the following: communication manager 150, transmit processor 220, TX MIMO processor 230, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0060] Although Figure 2 the boxes in are illustrated as different components, the functions described above for these boxes may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functions described for transmit processor 264, receive processor 258, and / or TX MIMO processor 266 may be performed by or under the control of controller / processor 280.

[0061] As indicated above, Figure 2 is provided as an example. Other examples may be different from the examples described with respect to Figure 2 the description.

[0062] The deployment of a communication system (such as a 5G NR system) can be arranged with various components or constituent parts in a variety of ways. In a 5G NR system or network, network nodes, network entities, mobility elements of the network, RAN nodes, core network nodes, network elements, base stations, or network equipment can be implemented in an aggregated or disaggregated architecture. For example, a base station (such as a Node B (NB), evolved NB (eNB), NR base station, 5G NB, access point (AP), TRP, or cell, etc.) or one or more units (or one or more components) performing base station functionality can be implemented as an aggregated base station (also referred to as a stand-alone base station or monolithic base station) or a disaggregated base station. A "network entity" or "network node" may refer to a disaggregated base station or one or more units of a disaggregated base station (such as one or more CUs, one or more DUs, one or more RUs, or a combination thereof).

[0063] A centralized base station (e.g., a centralized network node) may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). A split base station (e.g., a split network node) may be configured to utilize a protocol stack that is physically or logically distributed across two or more units (such as one or more CUs, one or more DUs, or one or more RUs). In some examples, a CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually spread across one or more other network nodes. A DU may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU may also be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), etc.

[0064] Base station type operations or network designs may consider the aggregation characteristics of base station functionality. For example, split base stations may be utilized in an IAB network, an open radio access network (O-RAN (such as a network configuration advocated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate the scaling of a communication system by separating base station functionality into one or more units that can be deployed separately. A split base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented virtually for at least one unit, which may enable flexibility in network design. The individual units of a split base station may be configured for wired or wireless communication with at least one other unit of the split base station.

[0065] Figure 3 is a diagram illustrating Example 300 of sidelink communication according to the present disclosure.

[0066] As Figure 3As shown, the first UE 305-1 may communicate with the second UE 305-2 (and one or more other UEs 305) via one or more sidelink channels 310. The UEs 305-1 and 305-2 may communicate using one or more sidelink channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication, and / or V2P communication) and / or mesh networking. In some aspects, the UEs 305 (e.g., UE 305-1 and / or UE 305-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, one or more sidelink channels 310 may use the PC5 interface and / or may operate in a high frequency band (e.g., 5.9 GHz band). Additionally or alternatively, the UEs 305 may use Global Navigation Satellite System (GNSS) timing to synchronize the timing of transmission time intervals (TTIs) (e.g., frames, sub-frames, time slots, or symbols).

[0067] As Figure 3 As further shown, one or more sidelink channels 310 may include a Physical Sidelink Control Channel (PSCCH) 315, a Physical Sidelink Shared Channel (PSSCH) 320, and / or a Physical Sidelink Feedback Channel (PSFCH) 325. The PSCCH 315 may be used to convey control information, similar to the Physical Downlink Control Channel (PDCCH) and / or the Physical Uplink Control Channel (PUCCH) used for cellular communication with the network node 110 via an access link or access channel. The PSSCH 320 may be used to convey data, similar to the Physical Downlink Shared Channel (PDSCH) and / or the Physical Uplink Shared Channel (PUSCH) used for cellular communication with the network node 110 via an access link or access channel. For example, the PSCCH 315 may carry sidelink control information (SCI) 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, and / or spatial resources), where a transport block (TB) 335 may be carried on the PSSCH 320. The TB 335 may include data. The PSFCH 325 may be used to convey sidelink feedback 340, such as Hybrid Automatic Repeat Request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), and / or a scheduling request (SR).

[0068] Although shown on PSCCH 315, in some aspects, SCI 330 may include multiple communications at different levels, such as a first-level SCI (SCI-1) and a second-level SCI (SCI-2). SCI-1 may be transmitted on PSCCH 315. SCI-2 may be transmitted on PSSCH 320. SCI-1 may include, for example, an indication of one or more resources (e.g., time resources, frequency resources, and / or spatial resources) on PSSCH 320, information for decoding sidelink communications on PSSCH, a quality of service (QoS) priority value, a resource reservation period, a PSSCH DMRS pattern, an SCI format for SCI-2, a β offset for SCI-2, the number of PSSCH DMRS ports, and / or an MCS. SCI-2 may include information associated with data transmission on PSSCH 320, such as a HARQ process ID, a new data indicator (NDI), a source identifier, a destination identifier, and / or a channel state information (CSI) report trigger.

[0069] In some aspects, one or more sidelink channels 310 may use a resource pool. For example, a scheduling assignment (e.g., included in SCI 330) may be transmitted in a subchannel using a specific resource block (RB) across time. In some aspects, data transmission (e.g., on PSSCH 320) associated with the scheduling assignment may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and the associated data transmission are not transmitted on adjacent RBs.

[0070] In some aspects, the UE 305 may operate using a sidelink resource allocation mode (e.g., mode 1), where resource selection and / or scheduling is performed by the network node 110 (e.g., a base station, CU, or DU). For example, the UE 305 may receive (e.g., directly or via one or more network nodes) from the network node 110 a grant for sidelink channel access and / or scheduling (e.g., in downlink control information (DCI) or in a radio resource control (RRC) message, such as a configured grant). In some aspects, the UE 305 may operate using a resource allocation mode (e.g., mode 2), where resource selection and / or scheduling is performed by the UE 305 (e.g., instead of the network node 110). In some aspects, the UE 305 may perform resource selection and / or scheduling by sensing the channel availability for transmission. For example, the UE 305 may measure RSSI parameters associated with various sidelink channels (e.g., sidelink - RSSI (S - RSSI) parameters), may measure RSRP parameters associated with various sidelink channels (e.g., PSSCH - RSRP parameters), and / or may measure RSRQ parameters associated with various sidelink channels (e.g., PSSCH - RSRQ parameters), and may select a channel for transmitting sidelink communication at least in part based on the measurements.

[0071] Additionally or alternatively, the UE 305 may use the SCI 330 received in the PSCCH 315 to perform resource selection and / or scheduling, and the SCI may indicate the occupied resources and / or channel parameters. Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling by determining the channel busy rate (CBR) associated with each sidelink channel, and the channel busy rate may be used for rate control (e.g., by indicating the maximum number of resource blocks that the UE 305 may use for a set of specific subframes).

[0072] In the resource allocation mode (e.g., mode 2) in which the UE 305 performs resource selection and / or scheduling, the UE 305 may generate a sidelink grant and may send the grant in the SCI 330. The sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks (e.g., for the TB 335) to be used for an upcoming sidelink transmission on the PSSCH 320, one or more subframes to be used for an upcoming sidelink transmission, and / or the MCS to be used for an upcoming sidelink transmission. In some aspects, the UE 305 may generate a sidelink grant that indicates one or more parameters for semi - persistent scheduling (SPS), such as the periodicity of sidelink transmissions. Additionally or alternatively, the UE 305 may generate a sidelink grant for event - driven scheduling (such as for on - demand sidelink messages).

[0073] As indicated above, Figure 3 is provided as an example. Other examples may be different from the examples described with respect to Figure 3 the examples described.

[0074] Figure 4 is a diagram illustrating example 400 of sidelink communication and access link communication in accordance with the present disclosure.

[0075] As Figure 4 shown, transmitter (Tx) / receiver (Rx) UE 405 and Rx / Tx UE 410 may communicate with each other via a sidelink, as described above in connection with Figure 3 As further shown, in some sidelink modes, network node 110 may communicate with Tx / Rx UE 405 (e.g., directly or via one or more network nodes) via a first access link, such as. Additionally or alternatively, in some sidelink modes, network node 110 may communicate with Rx / Tx UE 410 (e.g., directly or via one or more network nodes) via a first access link, such as. Tx / Rx UE 405 and / or Rx / Tx UE 410 may correspond to one or more UEs described elsewhere herein, such as Figure 1 UE 120. Thus, a direct link between UEs 120 (e.g., via the PC5 interface) may be referred to as a sidelink, and a direct link between network 110 and UE 120 (e.g., via the Uu interface) may be referred to as an access link. Sidelink communication may be transmitted via the sidelink, and access link communication may be transmitted via the access link. Access link communication may be downlink communication (from network node 110 to UE 120) or uplink communication (from UE 120 to network node 110).

[0076] As indicated above, Figure 4 is provided as an example. Other examples may be different from the examples described with respect to Figure 4 the examples described.

[0077] Figure 5 is a diagram illustrating example 500 of sidelink synchronization in accordance with the present disclosure.

[0078] In a typical cellular network, a UE can achieve time and frequency synchronization on the access link using periodic broadcasts from network nodes (e.g., periodic Synchronization Signal Blocks (SSBs) transmissions). In sidelink operation, one or more synchronization sources can send sidelink synchronization information to establish a reference time, indicate symbol timing, indicate frame timing, and / or otherwise send information to ensure that neighboring UEs participating in sidelink communication have the same timing reference. The sidelink synchronization procedure and the sidelink communication procedure can be decoupled, which is different from access link communication. For example, in some cases, a UE can send sidelink synchronization signals even if the UE is not the Tx UE involved in the sidelink transmission to the Rx UE. In some cases, a UE can refrain from sending sidelink synchronization signals even if the UE is the Tx UE involved in the sidelink transmission to the Rx UE. In some cases, an Rx UE communicating with a Tx UE via sidelink communication can perform sidelink synchronization (e.g., time and / or frequency synchronization) based on sidelink synchronization signals sent by sidelink synchronization sources other than the Tx UE.

[0079] In some examples, the synchronization sources that can be used by a UE for sidelink synchronization can include GNSS, network nodes (e.g., gNB or eNB), Synchronization Reference UEs (SyncRef UEs), and the UE's internal clock. As Figure 5 shown, the Tx UE 502 can send sidelink communication to the first RxUE 504 and the second Rx UE 506. The GNSS can be a sidelink synchronization source for the Tx UE 502. For example, the TxUE 502 can perform sidelink synchronization at least in part based on GNSS signals sent by the GNSS. In this case, the Tx UE502 can synchronize to the GNSS at least in part based on the GNSS signals. The network node (e.g., gNB or eNB) can be a sidelink synchronization source for the first RxUE 504. For example, the first Rx UE 504 can perform sidelink synchronization at least in part based on the SSB sent by the network node. The SyncRef UE can be a sidelink synchronization source for the second Rx UE 506. For example, the second Rx UE 506 can perform sidelink synchronization at least in part based on the sidelink SSB (S-SSB) sent by the SyncRef UE. The SyncRef UE can be any UE (e.g., UE 120) that sends sidelink synchronization signals (e.g., in the S-SSB).

[0080] In some examples, the S-SSB may occupy one time slot and use the same parameter set as configured in the sidelink bandwidth part (BWP) (e.g., the same parameter set as for the PSCCH and / or PSSCH). For example, the S-SSB may generally include 11 resource blocks (RBs) within 13 symbols in the time slot, where the physical sidelink broadcast channel (PSBCH) is transmitted in the first symbol and the sixth to thirteenth symbols, the sidelink primary synchronization signal (S-PSS) is transmitted in the second and third symbols, and the sidelink secondary synchronization signal (S-SSS) is transmitted in the fourth and fifth symbols. In this case, the S-PSS and S-SSS may occupy 127 subcarriers and use the same sequences as the PSS and SSS for the access link SSB, and the PSBCH / DMRS may occupy 132 subcarriers. In the sidelink SSB configuration, since the sidelink is configured as a time division duplex (TDD) band, the last (fourteenth) symbol may be reserved for transmitting / receiving a retuning gap symbol or a guard symbol. The S-PSS and S-SSS may be collectively referred to as the sidelink synchronization signal (SLSS), which may be used for time and frequency synchronization between neighboring UEs. For example, neighboring UEs may include UEs communicating with each other over the sidelink, UEs within a threshold proximity of each other, and / or UEs within a communication range of each other, etc.

[0081] As indicated above, Figure 5 is provided as an example. Other examples may be different from the examples described with respect to Figure 5 the examples.

[0082] Figure 6 is a diagram illustrating Example 600 of the priority rules for sidelink synchronization according to the present disclosure.

[0083] A UE may select a sidelink synchronization source for sidelink synchronization based on predefined priority rules that specify a set of priorities for sidelink synchronization sources. For example, the predefined priority rules may be configured for the UE (e.g., via a configuration received from a network node) or pre-configured. Figure 6 Illustrates three example priority rules, including a first GNSS-based synchronization priority rule (GNSS-based synchronization case 1), a second GNSS-based synchronization priority rule (GNSS-based synchronization case 2), and a network node-based synchronization priority rule (gNB / eNB-based synchronization).

[0084] As shown by reference numeral 605, the first GNSS-based synchronization priority rule (GNSS-based synchronization scenario 1) defines a synchronization level in which the GNSS signal has the highest priority (e.g., priority P0), whereby whenever the GNSS signal is available, the UE synchronizes to the GNSS timing. In the case where the GNSS signal is unavailable, the UE searches for and synchronizes to the S-SSB from the synchronization source based on descending priority, where the UE directly synchronized to the GNSS signal has the second highest priority (e.g., priority P1), the UE indirectly synchronized to the GNSS signal has the next highest priority (e.g., priority P2), and the remaining UEs have the lowest priority (e.g., priority P6).

[0085] As shown by reference numeral 610, the second GNSS-based synchronization priority rule (GNSS-based synchronization scenario 2) defines a synchronization level in which the GNSS signal has the highest priority (e.g., priority P0), whereby whenever the GNSS signal is available, the UE synchronizes to the GNSS timing. In the case where the GNSS signal is unavailable, the UE searches for and synchronizes to the synchronization signal (e.g., S-SSB or SSB) based on descending priority, where the UE directly synchronized to the GNSS signal has the second highest priority (e.g., priority P1), the UE indirectly synchronized to the GNSS signal has the next highest priority (e.g., priority P2), the network node (e.g., gNB or eNB) has the next highest priority (e.g., priority P3), the UE directly synchronized to the network node has the next highest priority (e.g., priority P4), the UE indirectly synchronized to the network node has the next highest priority (e.g., priority P5), and the remaining UEs have the lowest priority (e.g., priority P6).

[0086] As shown by reference numeral 615, the network node-based synchronization priority rule (gNB / eNB-based synchronization) defines a synchronization level in which the network node (e.g., gNB or eNB) has the highest priority (e.g., priority P0'), whereby whenever available, the UE performs sidelink synchronization based on the SSB sent by the network node. In the case where the SSB sent by the network node is unavailable, the UE searches for and synchronizes to the synchronization signal (e.g., S-SSB or GNSS signal) based on descending priority, where the UE directly synchronized to the network node has the second highest priority (e.g., priority P1'), the UE indirectly synchronized to the network node has the next highest priority (e.g., priority P2'), GNSS has the next highest priority (e.g., priority P3'), the UE directly synchronized to the GNSS signal has the next highest priority (e.g., priority P4'), the UE indirectly synchronized to the GNSS signal has the next highest priority (e.g., priority P5'), and the remaining UEs have the lowest priority (e.g., priority P6').

[0087] If a UE receives an S-SSB from another UE, the UE may transmit the S-SSB, and the timing reference of the other UE is derived from a node (e.g., a UE, a network node, or a GNSS transmitter) with a lower priority than the UE according to the priority rules configured (or pre-configured) for the UE. In some examples, if the UE cannot receive any SSB, S-SSB, or GNSS signal, the UE may use the UE's local clock as a synchronization source to transmit the S-SSB. When the UE receives an S-SSB, the priority of the S-SSB may be identified by the associated synchronization signal identifier (SSID) and the content of the PSBCH (e.g., the coverage indication field included in the PSBCH).

[0088] As indicated above, Figure 6 is provided as an example. Other examples may be different from the examples described with respect to Figure 6 what is described.

[0089] Figure 7 is a diagram illustrating Example 700 of the NES mode according to the present disclosure.

[0090] In some examples, a network node may be configured to operate in different NES modes (also referred to as "NES states") over time, where each NES mode may use one or more techniques to adjust transmission and / or reception in the time domain, frequency domain, spatial domain, and / or power domain. For example, the NES mode may include a normal operation mode (which may also be referred to as a legacy mode or a default mode), and one or more NES modes that may be associated with lower power consumption than the normal operation mode. As Figure 7 shown, the network node may be configured with a semi-static mode for switching between different NES modes to achieve network energy savings. For example, the semi-static mode may be configured via RRC signaling. The semi-static mode may include a sequence of NES modes that the network node follows with a given periodicity. For example, as Figure 7 shown, according to the semi-static mode, the network node may operate in a first NES mode (NES1) during a first time period, then the network node may operate in a flexible mode during a second time period, and then the network node may operate in a second NES mode (NES2) during a third time period. The configuration mode for switching NES modes repeats periodically.

[0091] In Figure 7In [the context], NES1 and NES2 can be different NES modes for a network node. In some examples, one NES mode (e.g., NES1) can be a normal operation mode, and the other NES mode (e.g., NES2) can be an NES mode associated with at least one operation that reduces network energy consumption compared to the normal operation mode. In some examples, NES1 can be an operation mode in which the network node serves a UE with a first number of (e.g., 64) antenna ports, and NES2 can be an operation mode in which the network node serves a UE with a second number of (e.g., 32) antenna ports. In some examples, NES1 can be a first sleep mode (e.g., light sleep mode), and NES2 can be a second sleep mode (e.g., deep sleep mode). In some examples, NES1 can be a downlink-only operation mode, and NES2 can be a downlink and uplink operation mode. In some examples, the semi-static mode that schedules the switching between NES modes can include more than two NES modes. For example, the network node can define and configure the UE with any number of different NES modes. The flexible mode can be a mode in which the network node can operate according to any suitable NES mode (e.g., depending on the current traffic condition), and the NES mode selected by the network node for the flexible mode can be dynamically indicated to the UEs served by the network node. For example, depending on the current traffic condition, the network node can dynamically indicate to the UE that the network node will operate in NES1, NES2, or any other configured NES mode during a duration associated with the flexible mode. Although Example 700 shows a semi-static mode including a flexible mode, in some other examples, the semi-static mode may not include a flexible mode. In this case, the semi-static mode can configure the switching between NES1, NES2, and / or one or more other NES modes.

[0092] The scheduling of a given NES mode (e.g., via the dynamic indication of the semi-static mode and / or the flexible mode) can depend on the expected traffic of the network node (e.g., downlink and / or uplink traffic). For example, for a time period with an expected small amount of traffic, the network node can operate in an NES mode with a smaller number of antenna ports, while for a time period with an expected large amount of traffic, the network node can operate in an NES mode with a larger number of antenna ports.

[0093] In some cases, depending on the NES mode in which the network node is operating, the characteristics associated with the SSB transmission by the network node may change, which may have an adverse impact on the UE's execution of sidelink synchronization based on the SSB transmitted by the network node. In some examples, due to antenna adaptation and / or power adaptation of the network node (e.g., due to the number of antennas used for SSB transmission), the SSB transmission power may be reduced in the NES mode. In some examples, the SSB transmission by the network node may be completely silenced in the NES mode, for example to allow the network node to enter a deep sleep mode. In some examples, the network node may turn off some antenna panels covering certain areas in the NES mode, which may prevent UEs in that area from maintaining synchronization for sidelink communication. Therefore, a network node that switches between NES modes may reduce the reliability of sidelink synchronization performed by UEs in the coverage area of the network node.

[0094] Some of the techniques and apparatuses described herein enable a UE to perform sidelink synchronization using sidelink synchronization rules that are at least partially based on the NES mode of the network node. In some aspects, the UE may receive a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. The UE may receive a NES mode indication indicating the scheduling of one or more NES modes for the network node. The UE may perform sidelink synchronization according to a priority rule among the plurality of priority rules at least partially based on the scheduling for one or more network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules. Therefore, the UE may change the priority rules for sidelink synchronization at least partially based on a change in the NES mode of the network node. For example, in a NES mode where the SSB transmission power is reduced or the SSB is not transmitted by the network node, the priority rules may prioritize GNSS-based sidelink synchronization. In this way, the reliability of sidelink synchronization performed by the UE can be increased while reducing the network power consumption in one or more NES modes.

[0095] As indicated above, Figure 7 is provided as an example. Other examples may be different from the examples described with respect to Figure 7 the description.

[0096] Figure 8 is a diagram illustrating Example 800 associated with NES mode-based sidelink synchronization according to the present disclosure. As Figure 8As shown, Example 800 includes communication between network node 110 and UE 120. In some aspects, network node 110 and UE 120 may be included in a wireless network (such as wireless network 100). Network node 110 and UE 120 may communicate via a wireless access link, which may include an uplink and a downlink. In some aspects, UE 120 may communicate with one or more other UEs via sidelink communication.

[0097] As Figure 8 shown by and reference numeral 805, UE 120 may receive a mapping indication indicating a mapping between multiple NES modes of network node 110 and multiple priority rules for sidelink synchronization. In some aspects, as Figure 8 shown, network node 110 may send the mapping indication, and UE 120 may receive the mapping indication from network node 110. In some aspects, the mapping indication may be included in a system information block (SIB) broadcast by network node 110. For example, the mapping indication may be included in SIB type #1 (SIB1) or other SIB (OSIB). In such a case, UE 120 may receive the SIB including the mapping indication. In some aspects, the mapping indication may be RRC configured for UE 120. For example, network node 110 may send an RRC message including the mapping indication, and UE 120 may receive the RRC message.

[0098] Although Figure 8It is shown that UE 120 receives a mapping indication from network node 110, but in some other aspects, UE 120 may receive the mapping indication from another UE (e.g., a sidelink UE) instead of from network node 110. For example, UE 120 may receive sidelink communication including the mapping indication from another UE (e.g., a sidelink UE). For example, in the case where UE 120 is outside the coverage of network node 110, UE 120 may receive the mapping indication from a sidelink UE within the coverage of network node 110. In some aspects, one or more sidelink UEs may broadcast (or share) the mapping indication via PSBCH communication, and UE 120 may receive the PSBCH communication including the mapping indication. In some aspects, layer 1 (L1), layer 2 (L2), or layer 3 (L3) signaling between UEs may be used to send the mapping indication. For example, in the case of using L1 signaling, the mapping indication may be included in the SCI (e.g., SCI-1 carried on PSCCH, SCI-2 carried on PSSCH, or a new SCI format), dedicated PSSCH communication (e.g., in dedicated PSSCH resources), or a sidelink wake-up signal (SL-WUS) sent from a sidelink UE to UE 120. In the case of using L2 signaling, the mapping indication may be included in a PC5 media access control (MAC) control element (MAC-CE) sent from a sidelink UE to UE 120. In the case of using L3 signaling, the mapping indication may be included in a PC5 RRC message sent from a sidelink UE to UE 120. In some aspects, the L1, L2, or L3 signaling including the mapping indication may be sent to UE 120 on demand in combination with a request for the mapping indication (or a request for the NES mode indication and the mapping indication) sent by UE 120 (e.g., via L1, L2, or L3 signaling) to a sidelink UE.

[0099] In some aspects, once UE 120 receives the mapping indication (e.g., from network node 110 or from a sidelink UE), UE 120 may send sidelink communication including the mapping indication. For example, UE 120 may send the mapping indication in sidelink communication to be received by one or more other UEs. In some aspects, UE 120 may broadcast the mapping indication in PSBCH communication. In some aspects, UE 120 may send the mapping indication to another UE via L1 signaling (e.g., in the SCI, dedicated PSSCH communication, or SL-WUS), L2 signaling (e.g., in the PC5 MAC-CE), or L3 signaling (e.g., in the PC5 RRC message). In this case, UE 120 may send the mapping indication to another UE at least partially based on receiving (e.g., via L1, L2, or L3 signaling) a request for the mapping indication (or a request for the NES mode indication and the mapping indication) from another UE.

[0100] The mapping indication may indicate a mapping between multiple NES modes of the network node 110 and multiple priority rules for sidelink synchronization. Each of the multiple priority rules may indicate the priority of a set of sidelink synchronization sources (e.g., GNSS, network nodes, UEs directly and indirectly synchronized with GNSS or network nodes, and / or other UEs). For example, the multiple priority rules may include the GNSS-based synchronization scenario 1 priority rule described in Figure 6 the GNSS-based synchronization scenario 2 priority rule described in Figure 6 the gNB / eNB-based synchronization priority rule described in Figure 6 , and / or other priority rules for sidelink synchronization.

[0101] In some aspects, the mapping indication may indicate a mapping between the current NES mode of the network node 110 and the corresponding priority rule. As shown in Figure 8 and reference numeral 810, in an example mapping, the first NES mode (NES1) may be mapped to the GNSS-based synchronization scenario 2 priority rule, the second NES mode (NES2) may be mapped to the gNB / eNB-based synchronization priority rule, and all other NES modes may be mapped to the GNSS-based synchronization scenario 2 priority rule. For example, in this case, NES1 may be an NES mode in which the SSB is not transmitted by the network node 110, or the SSB transmission power is reduced compared to NES2.

[0102] In some aspects, the mapping indication may indicate a mapping for determining a priority rule based at least in part on the current NES mode of the network node 110 and one or more future NES modes. That is, the UE 120 may determine a priority rule according to the mapping indication in accordance with the current NES mode and one or more future NES modes of the network node 110. In this case, the dependence on future NES modes may be limited to a time window. For example, the mapping indication may indicate a priority rule in accordance with the current NES mode and one or more future NES modes within the time window (e.g., starting from the current time when the UE 120 is determining the priority rule). For example, the mapping indication may indicate that the UE 120 uses the gNB / eNB-based synchronization priority rule when the current NES mode is NES1 and all future NES modes during the next 1-second time window are NES1 or the normal operation mode, and uses the GNSS-based synchronization scenario 2 priority rule in other cases.

[0103] As shown in Figure 8As further shown by the reference numeral 815, the UE 120 may receive a NES mode indication. The NES mode indication may indicate the scheduling of one or more NES modes for the network node 110. As Figure 8 shown, in some aspects, the network node 110 may send a NES mode indication, and the UE 120 may receive the NES mode indication sent by the network node 110. In some aspects, the NES mode indication may indicate the configuration of a mode (e.g., a semi-static mode) for switching between multiple NES modes. For example, the NES mode indication may be an indication of a mode for switching between multiple NES modes included in an RRC message sent from the network node 110 to the UE 120. In some aspects, the NES mode indication may be a dynamic indication to switch to a NES mode. In this case, the dynamic indication to switch to a NES mode may be included in a DCI or a MAC-CE sent from the network node 110 to the UE 120. For example, the dynamic indication may indicate a NES mode of a flexible mode in the configuration modes to be used for switching between multiple NES modes.

[0104] Although Figure 8 it is shown that the UE 120 receives a NES mode indication from the network node 110, in some other aspects, the UE 120 may receive a NES mode indication from another UE (e.g., a sidelink UE). In some aspects, the sidelink UE may broadcast a NES mode indication in a PSBCH communication. In some aspects, the sidelink UE may send a NES mode indication to the UE 120 via L1 signaling (e.g., in an SCI (SCI-1, SCI-2, or a new SCI format), dedicated PSSCH communication, or SL-WUS), L2 signaling (e.g., in a PC5 MAC-CE), or L3 signaling (e.g., in a PC5 RRC message). In this case, the sidelink UE may send a NES mode indication to the UE 120 at least partially based on a request (or a request for a NES mode indication and a mapping indication) sent by the UE 120 to the sidelink UE (e.g., via L1, L2, or L3 signaling).

[0105] In some aspects, once the UE 120 receives a NES mode indication (e.g., from the network node 110 or a sidelink UE), the UE 120 may send the NES mode indication in sidelink communication for receipt by one or more other UEs. In some aspects, the UE 120 may broadcast the NES mode indication in PSBCH communication. In some aspects, the UE 120 may send the NES mode indication to another UE via L1 signaling (e.g., in SCI, dedicated PSSCH communication, or SL-WUS), L2 signaling (e.g., in PC5 MAC-CE), or L3 signaling (e.g., in a PC5 RRC message). In such a case, the UE 120 may send the NES mode indication to another UE at least in part based on receiving (e.g., via L1, L2, or L3 signaling) a request for the NES mode indication (or a request for the NES mode indication and a mapping indication) from the other UE.

[0106] As Figure 8 Further shown by and reference numeral 820, the UE 120 may perform sidelink synchronization at least in part based on the mapping indication and the NES mode indication. In some aspects, the UE 120 may perform sidelink synchronization according to the priority rules for sidelink synchronization at least in part based on the scheduling for one or more NES modes indicated by the NES mode indication and the mapping between the plurality of NES modes indicated by the mapping indication and the plurality of priority rules for sidelink synchronization. For example, the UE 120 may use the mapping between the plurality of NES modes and the plurality of priority rules to determine which priority rule among the plurality of priority rules is to be applied to sidelink synchronization at least in part based on the indicated scheduling for one or more NES modes.

[0107] In some aspects, the UE 120 may determine the priority rules based on the current NES mode of the network node 110, as indicated by the NES mode indication. For example, the UE 120 may determine the current NES mode according to the configuration mode for NES mode switching (e.g., semi-static mode) and / or the dynamic indication of the NES mode. In such a case, at least in part based on the mapping between the plurality of NES modes and the plurality of priority rules, the UE 120 may determine the priority rule among the plurality of priority rules that corresponds to the current NES mode of the network node 110.

[0108] In some aspects, the UE 120 may determine a priority rule at least in part based on a current NES mode and one or more future NES modes. For example, the UE 120 may determine a priority rule at least in part based on the current NES mode at the current time and one or more future NES modes scheduled in a time window (e.g., 1 second) starting from the current time. The UE 120 may determine the current NES mode and one or more NES modes scheduled in the time window according to a configuration mode for NES mode switching (e.g., semi-static mode) and / or a dynamic indication of the NES mode (e.g., for a configured flexible mode). In this case, at least in part based on a mapping between multiple NES modes and multiple priority rules, the UE 120 may determine a priority rule among the multiple priority rules to be applied in combination with the current NES mode and one or more future NES modes within the time window.

[0109] The priority rule determined by the UE 120 may indicate the priority of a set of sidelink synchronization sources, and the UE 120 may select a sidelink synchronization source according to the priority of the set of sidelink sources indicated by the priority rule. For example, the priority rule may be a GNSS-based synchronization case 1 priority rule, a GNSS-based synchronization case 2 priority rule, or a gNB / eNB-based synchronization priority rule, etc. As described above in connection with Figure 6 As described, in the case where the priority rule is a GNSS-based synchronization case 1 priority rule, the UE 120 may prioritize GNSS signals as sidelink synchronization sources, followed by UEs directly synchronized to GNSS signals, followed by UEs indirectly synchronized to GNSS signals, and then the remaining UEs. As described above in connection with Figure 6 As described, in the case where the priority rule is a GNSS-based synchronization case 2 priority rule, the UE 120 may prioritize GNSS signals as sidelink synchronization sources, followed by UEs directly synchronized to GNSS signals, followed by UEs indirectly synchronized to GNSS signals, followed by network nodes (e.g., network node 110), followed by UEs directly synchronized to network nodes, followed by UEs indirectly synchronized to network nodes, and then the remaining UEs. As described above in connection with Figure 6 As described, in the case where the priority rule is a gNB / eNB priority rule, the UE 120 may prioritize network nodes (e.g., network node 110) as sidelink synchronization sources, followed by UEs directly synchronized to network nodes, followed by UEs indirectly synchronized to network nodes, followed by GNSS signals, followed by UEs directly synchronized to GNSS signals, followed by UEs indirectly synchronized to GNSS signals, and then the remaining UEs.

[0110] UE 120 may receive synchronization signals from a selected sidelink synchronization source, and UE 120 may perform sidelink synchronization (e.g., time and / or frequency synchronization) at least in part based on the synchronization signals. For example, in the case where the sidelink synchronization source is GNSS, the synchronization signal may be a GNSS signal. In the case where the sidelink synchronization source is a network node (e.g., network node 110), the synchronization signal may be an SSB (or may be included therein) sent by the network node. In the case where the sidelink synchronization source is another UE (e.g., SyncRef UE), the synchronization signal may be an S-SSB (or may be included therein) sent by the other UE.

[0111] Once UE 120 performs sidelink synchronization, UE 120 may perform sidelink communication with one or more other UEs. For example, UE 120 may send one or more sidelink communications to one or more other UEs and / or receive one or more sidelink communications from one or more other UEs. In some aspects, once UE 120 performs sidelink synchronization, UE 120 may send synchronization signals that may be used by one or more other UEs for sidelink synchronization. For example, UE 120 may send an S-SSB at least in part based on UE 120 receiving an S-SSB from another UE, the timing reference of which is derived from a node (e.g., sidelink synchronization source) with a lower priority than UE 120 according to priority rules determined by UE 120.

[0112] In some aspects, UE 120 may update the priority rules for sidelink synchronization at least in part based on a change in the NES mode of network node 110 according to the mapping between the NES mode and the priority rules. In some aspects, UE 120 may be triggered to update the priority rules by a NES mode change notification. In this case, UE 120 may receive (e.g., from network node 110 or another UE) a NES mode change notification, and UE 120 may switch from one priority rule to another at least in part based on the NES mode change notification and the mapping between multiple NES modes and multiple priority rules. For example, the NES mode change notification may be a dynamic indication of a change from one NES mode to another NES mode. In combination with switching the priority rules, UE 120 may perform sidelink synchronization at least in part based on different sidelink synchronization sources according to the updated priority rules.

[0113] In some aspects, the priority rules determined by the UE 120 may be associated with a time window for the validity of the priority rules. For example, each of the multiple priority rules indicated by the mapping indication may be associated with a corresponding time window for validity, or all of the multiple priority rules may be associated with the same time window for validity. In such a case, the expiration of the time window for the validity of the priority rules may trigger the UE 120 to update the priority rules (e.g., at least partially based on the mapping between the NES modes and the priority rules and the current and / or future scheduling NES modes of the network node 110). In combination with switching the priority rules, the UE 120 may perform sidelink synchronization according to the updated priority rules, at least partially based on different sidelink synchronization sources.

[0114] In some aspects, the UE 120 may be triggered to update the priority rules at least partially based on an indication received from another UE 120 via L1 signaling (e.g., in an SCI (SCI-1, SCI-2, or a new SCI format), dedicated PSSCH communication, or SL-WUS), L2 signaling (e.g., in a PC5 MAC-CE), or L3 signaling (e.g., in a PC5 RRC message). In some aspects, the UE 120 may be triggered to update the priority rules at least partially based on an updated mapping indication. For example, the UE 120 may receive an updated mapping indication indicating an updated mapping between multiple network energy saving modes and multiple priority rules for sidelink synchronization, and the UE 120 may switch from one priority rule to another at least partially based on the updated mapping between the multiple network energy saving modes and the multiple priority rules for sidelink synchronization. In some aspects, the UE 120 may receive the updated mapping indication from the network node 110. In other aspects, the UE 120 may receive the updated mapping indication from another UE in sidelink communication (e.g., via L1, L2, or L3 signaling). For example, the updated mapping indication may be included in an SCI (e.g., SCI-1 carried on a PSCCH, SCI-2 carried on a PSSCH, or a new SCI format), dedicated PSSCH communication (e.g., in dedicated PSSCH resources), SL-WUS, PC5 MAC-CE, or a PC5 RRC message.

[0115] As indicated above, Figure 8 is provided as an example. Other examples may be different from the examples described with respect to Figure 8 the examples.

[0116] Figure 9 is a diagram illustrating an example process 900 performed by a UE, such as the UE 120, according to the present disclosure. The example process 900 is an example in which a UE (e.g., the UE 120) performs operations associated with sidelink synchronization based on NES modes.

[0117] As Figure 9 shown, in some aspects, process 900 may include receiving a mapping indication (block 910) that indicates a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization. For example, a UE (e.g., using Figure 11 the communication manager 140 and / or the receiving component 1102 depicted in

[0118] As Figure 9 further shown, in some aspects, process 900 may include receiving a network energy saving mode indication (block 920) that indicates a schedule for one or more of the plurality of network energy saving modes. For example, a UE (e.g., using Figure 11 the communication manager 140 and / or the receiving component 1102 depicted in

[0119] As Figure 9 further shown, in some aspects, process 900 may include performing sidelink synchronization (block 930) according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for one or more of the network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization. For example, a UE (e.g., using Figure 11 the communication manager 140 and / or the sidelink synchronization component 1108 depicted in

[0120] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0121] In a first aspect, each of the plurality of priority rules indicates a priority of a set of sidelink synchronization sources, and performing sidelink synchronization according to a priority rule among the plurality of priority rules includes performing sidelink synchronization at least in part based on a sidelink synchronization source in the set of sidelink synchronization sources according to the priority of the set of sidelink synchronization sources indicated by the priority rule.

[0122] In a second aspect, either alone or in combination with the first aspect, receiving the mapping indication includes receiving, from a network node, a system information block (SIB) that includes the mapping indication.

[0123] In a third aspect, either alone or in combination with one or more of the first and second aspects, receiving the mapping indication includes receiving, from a network node, a radio resource control (RRC) message that includes the mapping indication.

[0124] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, receiving the mapping indication includes receiving, from another user equipment (UE), sidelink communication that includes the mapping indication.

[0125] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the mapping indication is included in a scheduling control information (SCI), dedicated physical shared channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control control element (MAC-CE), PC5 RRC message, or sidelink broadcast channel communication.

[0126] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, a priority rule among a plurality of priority rules is associated with a current network energy saving mode.

[0127] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, a priority rule among a plurality of priority rules is at least partially based on the current network energy saving mode indicated by a network energy saving mode indication and one or more future network energy saving modes.

[0128] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, one or more future network energy saving modes include one or more future network energy saving modes scheduled in a time window starting from the current time.

[0129] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, procedure 900 includes receiving a network energy saving mode change notification; and switching, at least partially based on the network energy saving mode change notification, from a priority rule among a plurality of priority rules for sidelink synchronization to another priority rule among a plurality of priority rules for sidelink synchronization.

[0130] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, procedure 900 includes switching, at least partially based on the expiration of a time window for the validity of a priority rule, from a priority rule among a plurality of priority rules for sidelink synchronization to another priority rule among a plurality of priority rules for sidelink synchronization.

[0131] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 900 includes receiving an update mapping indication indicating an update mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization; and switching from a priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the update mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

[0132] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the update mapping indication is included in an SCI, dedicated PSSCH communication, SL-WUS, PC5 MAC-CE, or PC5 RRC message.

[0133] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, process 900 includes transmitting a sidelink communication including the mapping indication.

[0134] Although Figure 9 example boxes of process 900 are shown, in some aspects, process 900 may include additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner compared to those depicted in Figure 9 . Additionally or alternatively, two or more boxes of process 900 may be executed in parallel.

[0135] Figure 10 is a diagram illustrating an example process 1000, for example, performed by a network node according to the present disclosure. Example process 1000 is an example in which a network node (e.g., network node 110) performs operations associated with NES mode-based sidelink synchronization.

[0136] As Figure 10 shown, in some aspects, process 1000 may include transmitting a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a UE (block 1010). For example, a network node (e.g., using Figure 12 the communication manager 150 and / or the transmitting component 1204 depicted in

[0137] As Figure 10 further shown, in some aspects, process 1000 may include transmitting a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes (block 1020). For example, a network node (e.g., using Figure 12The communication manager 150 and / or the sending component 1204 depicted in [description] may send a network energy saving mode indication indicating the scheduling for one or more of multiple network energy saving modes, as described above.

[0138] The process 1000 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0139] In a first aspect, each of a plurality of priority rules indicates the priority of a set of sidelink synchronization sources.

[0140] In a second aspect, either alone or in combination with the first aspect, the transmission mapping indication includes transmitting a system information block (SIB) including the mapping indication.

[0141] In a third aspect, either alone or in combination with one or more of the first and second aspects, the transmission mapping indication includes transmitting a radio resource control (RRC) message including the mapping indication.

[0142] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the process 1000 includes sending a network energy saving mode change notification.

[0143] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the process 1000 includes sending an updated mapping indication indicating an updated mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization.

[0144] Although Figure 10 example boxes of the process 1000 are shown, in some aspects, the process 1000 may include additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner compared to those depicted in Figure 10 . Additionally or alternatively, two or more boxes of the process 1000 may be executed in parallel.

[0145] Figure 11 is a diagram of an example apparatus 1100 for wireless communication in accordance with the present disclosure. The apparatus 1100 may be a user equipment (UE), or the UE may include the apparatus 1100. In some aspects, the apparatus 1100 includes a receiving component 1102 and a sending component 1104, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 1100 may use the receiving component 1102 and the sending component 1104 to communicate with another apparatus 1106 (such as a UE, a base station, or another wireless communication device). As further shown, the apparatus 1100 may include a communication manager 140. The communication manager 140 may include a sidelink synchronization component 1108 and so on.

[0146] In some aspects, apparatus 1100 may be configured to perform one or more operations described herein in connection with Figure 8 Additional or alternatively, apparatus 1100 may be configured to perform one or more processes described herein (such as Figure 9 process 900) or combinations thereof. In some aspects, Figure 11 the apparatus 1100 and / or one or more components shown may include one or more components of a UE described in connection with Figure 2 Additional or alternatively, Figure 11 one or more components shown may be implemented within one or more components described in connection with Figure 2 Additional or alternatively, one or more components of a set of components may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code that are stored in a non-transitory computer-readable medium and are executable by a controller or processor to perform the functions or operations of the component.

[0147] The receiving component 1102 may receive communications from apparatus 1106, such as reference signals, control information, data communications, or combinations thereof. The receiving component 1102 may provide the received communications to one or more other components of apparatus 1100. In some aspects, the receiving component 1102 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.), and may provide the processed signals to one or more other components of apparatus 1100. In some aspects, the receiving component 1102 may include one or more antennas, modems, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or combinations thereof of a UE described in connection with Figure 2 Additional or alternatively,

[0148] The transmitting component 1104 may transmit communications to apparatus 1106, such as reference signals, control information, data communications, or combinations thereof. In some aspects, one or more other components of apparatus 1100 may generate communications and may provide the generated communications to the transmitting component 1104 for transmission to apparatus 1106. In some aspects, the transmitting component 1104 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.), and may transmit the processed signals to apparatus 1106. In some aspects, the transmitting component 1104 may include one or more components of a UE described in connection with Figure 2One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories of the described UE, or combinations thereof. In some aspects, transmit component 1104 may be co-located with receive component 1102 in a transceiver.

[0149] Receive component 1102 may receive a mapping indication indicating a mapping between multiple network energy saving modes and multiple priority rules for sidelink synchronization. Receive component 1102 may receive a network energy saving mode indication indicating a schedule for one or more of the multiple network energy saving modes. Sidelink synchronization component 1108 may perform sidelink synchronization according to a priority rule among the multiple priority rules for sidelink synchronization, at least in part based on the schedule for one or more network energy saving modes and the mapping between the multiple network energy saving modes and the multiple priority rules for sidelink synchronization.

[0150] Receive component 1102 may receive a network energy saving mode change notification.

[0151] Sidelink synchronization component 1108 may switch from a priority rule among the multiple priority rules for sidelink synchronization to another priority rule among the multiple priority rules for sidelink synchronization, at least in part based on the network energy saving mode change notification.

[0152] Sidelink synchronization component 1108 may switch from a priority rule among the multiple priority rules for sidelink synchronization to another priority rule among the multiple priority rules for sidelink synchronization, at least in part based on the expiration of a time window for the validity of the priority rule.

[0153] Receive component 1102 may receive an updated mapping indication indicating an updated mapping between multiple network energy saving modes and multiple priority rules for sidelink synchronization.

[0154] Sidelink synchronization component 1108 may switch from a priority rule among the multiple priority rules for sidelink synchronization to another priority rule among the multiple priority rules for sidelink synchronization, at least in part based on the updated mapping between the multiple network energy saving modes and the multiple priority rules for sidelink synchronization.

[0155] Transmit component 1104 may transmit sidelink communication including a mapping indication.

[0156] Figure 11 The number and arrangement of the illustrated components are provided as an example. In fact, there may be additional components, fewer components, different components, or components arranged in a different manner compared to Figure 11 those illustrated. Additionally, Figure 11The two or more components shown may be implemented within a single component, or Figure 11 the single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 11 a set of (one or more) components shown may perform one or more functions described as being performed by Figure 11 another set of components shown.

[0157] Figure 12 is a diagram of an example apparatus 1200 for wireless communication in accordance with the present disclosure. The apparatus 1200 may be a network node, or a network node may include the apparatus 1200. In some aspects, the apparatus 1200 includes a receiving component 1202 and a transmitting component 1204, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 1200 may communicate with another apparatus 1206 (such as a UE, a base station, or another wireless communication device) using the receiving component 1202 and the transmitting component 1204. As further shown, the apparatus 1200 may include a communication manager 150. The communication manager 150 may include a determining component 1208 and so on.

[0158] In some aspects, the apparatus 1200 may be configured to perform one or more operations described herein in connection with Figure 8 Additional or alternative, the apparatus 1200 may be configured to perform one or more processes described herein (such as Figure 10 process 1000) or a combination thereof. In some aspects, Figure 12 the apparatus 1200 and / or one or more components shown may include one or more components of a network node described in connection with Figure 2 Additional or alternative, Figure 12 one or more components shown may be implemented within one or more components described in connection with Figure 2 Additional or alternative, one or more components of a set of components may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code that is stored in a non-transitory computer-readable medium and is executable by a controller or a processor to perform the functions or operations of the component.

[0159] The receiving component 1202 can receive communications from the device 1206, such as reference signals, control information, data communications, or combinations thereof. The receiving component 1202 can provide the received communications to one or more other components of the device 1200. In some aspects, the receiving component 1202 can perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.), and can provide the processed signals to one or more other components of the device 1200. In some aspects, the receiving component 1202 can include one or more antennas, modems, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or combinations thereof of the network node described in conjunction with Figure 2 The transmitting component 1204 can send communications to the device 1206, such as reference signals, control information, data communications, or combinations thereof. In some aspects, one or more other components of the device 1200 can generate communications and can provide the generated communications to the transmitting component 1204 for transmission to the device 1206. In some aspects, the transmitting component 1204 can perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.), and can send the processed signals to the device 1206. In some aspects, the transmitting component 1204 can include one or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the network node described in conjunction with

[0160] The transmitting component 1204 can send a mapping indication indicating the mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by the UE. The transmitting component 1204 can send a network energy saving mode indication indicating the scheduling for one or more of the plurality of network energy saving modes. Figure 2 The determining component 1208 can determine the mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization.

[0161] The transmitting component 1204 can send a network energy saving mode change notification.

[0162] The transmitting component 1204 can send an updated mapping indication indicating the updated mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization.

[0163] The transmitting component 1204 can send a network energy saving mode change notification.

[0164] The transmitting component 1204 can send an updated mapping indication indicating the updated mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization.

[0165] Figure 12The number and arrangement of the components shown are provided as an example. In fact, there may be additional components, fewer components, different components, or components arranged in a different manner compared to those shown. Additionally, Figure 12 two or more of the components shown may be implemented within a single component, or Figure 12 a single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 12 a set of (one or more) components shown may perform one or more functions described as being performed by another set of components shown. Figure 12 The number and arrangement of the components shown are provided as an example. In fact, there may be additional components, fewer components, different components, or components arranged in a different manner compared to those shown. Additionally, Figure 12 two or more of the components shown may be implemented within a single component, or

[0166] An overview of some aspects of the present disclosure is provided below:

[0167] Aspect 1: A method of wireless communication performed by a user equipment (UE), the method comprising: receiving a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization; receiving a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes; and performing sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for the one or more network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

[0168] Aspect 2: The method according to aspect 1, wherein each priority rule among the plurality of priority rules indicates a priority of a set of sidelink synchronization sources, and wherein performing sidelink synchronization according to a priority rule among the plurality of priority rules comprises: performing sidelink synchronization at least in part based on a sidelink synchronization source among the set of sidelink synchronization sources according to the priority of the set of sidelink synchronization sources indicated by the priority rule.

[0169] Aspect 3: The method according to any one of aspects 1 to 2, wherein receiving the mapping indication comprises: receiving a system information block (SIB) including the mapping indication from a network node.

[0170] Aspect 4: The method according to any one of aspects 1 to 2, wherein receiving the mapping indication comprises: receiving a radio resource control (RRC) message including the mapping indication from a network node.

[0171] Aspect 5: The method according to any one of aspects 1 to 2, wherein receiving the mapping indication comprises: receiving sidelink communication including the mapping indication from another UE.

[0172] Aspect 6: The method according to aspect 5, wherein the mapping indication is included in sidelink control information (SCI), dedicated physical sidelink control channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control (MAC) control element (MAC-CE), PC5 radio resource control (RRC) message, or sidelink broadcast channel communication.

[0173] Aspect 7: The method according to any one of aspects 1 to 6, wherein the priority rule among the plurality of priority rules is associated with a current network energy saving mode.

[0174] Aspect 8: The method according to any one of aspects 1 to 7, wherein the priority rule among the plurality of priority rules is at least partially based on the current network energy saving mode indicated by the network energy saving mode indication and one or more future network energy saving modes.

[0175] Aspect 9: The method according to aspect 8, wherein the one or more future network energy saving modes include one or more future network energy saving modes scheduled in a time window starting from the current time.

[0176] Aspect 10: The method according to any one of aspects 1 to 9, the method further comprising: receiving a network energy saving mode change notification; and switching, at least partially based on the network energy saving mode change notification, from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization.

[0177] Aspect 11: The method according to any one of aspects 1 to 10, the method further comprising: switching, at least partially based on the expiration of a time window for the validity of the priority rule, from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization.

[0178] Aspect 12: The method according to any one of aspects 1 to 11, the method further comprising: receiving an updated mapping indication indicating an updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization; and switching, at least partially based on the updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization, from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization.

[0179] Aspect 13: The method according to aspect 12, wherein the updated mapping indication is included in sidelink control information (SCI), dedicated physical sidelink control channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control (MAC) control element (MAC-CE), or PC5 radio resource control (RRC) message.

[0180] Aspect 14: The method according to any one of aspects 1 to 13, the method further comprising: transmitting sidelink communication comprising the mapping indication.

[0181] Aspect 15: A method of wireless communication performed by a network node, the method comprising: transmitting a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a user equipment (UE); and transmitting a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes.

[0182] Aspect 16: The method according to aspect 15, wherein each of the plurality of priority rules indicates a priority of a set of sidelink synchronization sources.

[0183] Aspect 17: The method according to any one of aspects 15 to 16, wherein transmitting the mapping indication comprises: transmitting a system information block (SIB) comprising the mapping indication.

[0184] Aspect 18: The method according to any one of aspects 15 to 16, wherein transmitting the mapping indication comprises: transmitting a radio resource control (RRC) message comprising the mapping indication.

[0185] Aspect 19: The method according to any one of aspects 15 to 18, the method further comprising: transmitting a network energy saving mode change notification.

[0186] Aspect 20: The method according to any one of aspects 15 to 19, the method further comprising: transmitting an updated mapping indication indicating an updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization;

[0187] Aspect 21: An apparatus for wireless communication at a device, the apparatus 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 according to one or more of aspects 1 to 20.

[0188] Aspect 22: A device for wireless communication, the device including a memory and one or more processors coupled to the memory, the one or more processors being configured to execute the method according to one or more of Aspects 1 to 20.

[0189] Aspect 23: A device for wireless communication, the device including at least one component for executing the method according to one or more of Aspects 1 to 20.

[0190] Aspect 24: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to execute the method according to one or more of Aspects 1 to 20.

[0191] Aspect 25: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set including one or more instructions that, when executed by one or more processors of a device, cause the device to execute the method according to one or more of Aspects 1 to 20.

[0192] 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 obtained from practice of the aspects.

[0193] As used herein, the term "component" is intended to be broadly construed as a combination of hardware and / or hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other name, "software" should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, executing threads, procedures, and / or functions, etc. As used herein, a "processor" is implemented in a combination of hardware and / or hardware and software. It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware and / or hardware and software combinations. The actual specific control hardware or software code used to implement these systems and / or methods does not limit the aspects. Accordingly, the operation and behavior of the systems and / or methods are not described herein with reference to specific software code, as those skilled in the art will understand that the software and hardware can be designed at least in part based on the description herein to implement the systems and / or methods.

[0194] As used herein, depending on the context, "meeting a threshold" may refer to a value being 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.

[0195] Although specific combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. Many of these features may be combined in ways not specifically recited in the claims and / or not disclosed in the specification. The disclosure of each aspect includes each dependent claim in combination with every other claim in the set of claims. As used herein, the phrase referring to a list of items "at least one of" refers to any combination of those items (which includes a single member). By way of example, "at least one of a, b, or c" is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiple of the same element (e.g., a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c).

[0196] Any element, act, or instruction used herein should not be construed as critical or essential unless explicitly described as such. Further, as used herein, the article "a" is intended to include one or more items and may be used interchangeably with "one or more." Further, as used herein, the article "the" is intended to include one or more items referred to in conjunction with the article "the" and may be used interchangeably with "one or more." Further, as used herein, the terms "set" and "group" are intended to include one or more items and may be used interchangeably with "one or more." If only intending to refer to a single item, the phrase "only one" or similar language will be used. Further, as used herein, the terms "has," "having," etc. are intended to be open-ended terms that do not limit the elements they modify (e.g., an element "having" A may also have B). Further, the phrase "based on" is intended to mean "at least partially based on" unless otherwise explicitly stated. Further, as used herein, the term "or" when used in a series is intended to be open-ended and may be used interchangeably with "and / or" unless otherwise explicitly stated (e.g., if used in conjunction with "either" or "only one").

Claims

1. A user equipment (UE) for wireless communication, the UE comprising: a memory; and one or more processors coupled to the memory, the one or more processors being configured to: receive a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization; receive a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes; and perform sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the schedule for the one or more network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

2. The UE according to claim 1, wherein each priority rule among the plurality of priority rules indicates a priority of a set of sidelink synchronization sources, and wherein, in order to perform sidelink synchronization according to the priority rule among the plurality of priority rules, the one or more processors are configured to: perform sidelink synchronization at least in part based on a sidelink synchronization source among the set of sidelink synchronization sources, according to the priority of the set of sidelink synchronization sources indicated by the priority rule.

3. The UE according to claim 1, wherein, in order to receive the mapping indication, the one or more processors are configured to: receive a system information block (SIB) including the mapping indication from a network node.

4. The UE according to claim 1, wherein, in order to receive the mapping indication, the one or more processors are configured to: receive a radio resource control (RRC) message including the mapping indication from a network node.

5. The UE according to claim 1, wherein, in order to receive the mapping indication, the one or more processors are configured to: receive sidelink communication including the mapping indication from another UE.

6. The UE according to claim 5, wherein the mapping indication is included in sidelink control information (SCI), dedicated physical sidelink control channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control (MAC) control element (MAC-CE), PC5 radio resource control (RRC) message, or sidelink broadcast channel communication.

7. The UE according to claim 1, wherein the priority rule among the plurality of priority rules is associated with a current network energy saving mode.

8. The UE according to claim 1, wherein the priority rule among the plurality of priority rules is at least in part based on the current network energy saving mode indicated by the network energy saving mode indication and one or more future network energy saving modes.

9. The UE according to claim 8, wherein the one or more future network energy saving modes include one or more future network energy saving modes scheduled in a time window starting from the current time.

10. The UE according to claim 1, wherein the one or more processors are further configured to: Receive a notification of a change in the network energy saving mode; and Switch from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the notification of the change in the network energy saving mode.

11. The UE according to claim 1, wherein the one or more processors are further configured to: Switch from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the expiration of a time window for the validity of the priority rule.

12. The UE according to claim 1, wherein the one or more processors are further configured to: Receive an update mapping indication indicating an updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization; and Switch from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization, at least in part based on the updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

13. The UE according to claim 12, wherein the update mapping indication is included in sidelink control information (SCI), dedicated physical sidelink control channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control (MAC) control element (MAC-CE), or PC5 radio resource control (RRC) message.

14. The UE according to claim 1, wherein the one or more processors are further configured to: Transmit sidelink communication including the mapping indication.

15. A network node for wireless communication, the network node comprising: A memory; And One or more processors coupled to the memory, the one or more processors being configured to: Transmit a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a user equipment (UE); And Transmit a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes.

16. A method of wireless communication performed by a user equipment (UE), the method comprising: Receiving a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization; Receiving a network energy saving mode indication indicating a schedule for one or more of the plurality of network energy saving modes; And Perform sidelink synchronization according to a priority rule among the plurality of priority rules for sidelink synchronization, at least partially based on the scheduling for the one or more network energy saving modes and the mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization.

17. The method according to claim 16, wherein each priority rule among the plurality of priority rules indicates a priority of a set of sidelink synchronization sources, and wherein performing sidelink synchronization according to a priority rule among the plurality of priority rules comprises: Performing sidelink synchronization at least partially based on a sidelink synchronization source in the set of sidelink synchronization sources, according to the priority of the set of sidelink synchronization sources indicated by the priority rule.

18. The method according to claim 16, wherein receiving the mapping indication comprises: Receiving a system information block (SIB) including the mapping indication from a network node.

19. The method according to claim 16, wherein receiving the mapping indication comprises: Receiving a radio resource control (RRC) message including the mapping indication from a network node.

20. The method according to claim 16, wherein receiving the mapping indication comprises: Receiving sidelink communication including the mapping indication from another UE.

21. The method according to claim 20, wherein the mapping indication is included in sidelink control information (SCI), dedicated physical sidelink control channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control (MAC) control element (MAC-CE), PC5 radio resource control (RRC) message, or sidelink broadcast channel communication.

22. The method according to claim 16, wherein the priority rule among the plurality of priority rules is associated with a current network energy saving mode.

23. The method according to claim 16, wherein the priority rule among the plurality of priority rules is at least partially based on the current network energy saving mode indicated by the network energy saving mode indication and one or more future network energy saving modes.

24. The method according to claim 23, wherein the one or more future network energy saving modes include one or more future network energy saving modes scheduled in a time window starting from the current time.

25. The method according to claim 16, the method further comprising: Receiving a network energy saving mode change notification; and Switching from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization, at least partially based on the network energy saving mode change notification.

26. The method according to claim 16, the method further comprising: Switching from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization, at least partially based on the expiration of a time window for the validity of the priority rule.

27. The method according to claim 16, the method further comprising: Receiving an update mapping indication indicating an updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization; And Switching, at least in part based on the updated mapping between the plurality of network energy saving modes and the plurality of priority rules for sidelink synchronization, from the priority rule among the plurality of priority rules for sidelink synchronization to another priority rule among the plurality of priority rules for sidelink synchronization.

28. The method according to claim 27, wherein the update mapping indication is included in sidelink control information (SCI), dedicated physical sidelink control channel (PSSCH) communication, sidelink wake-up signal (SL-WUS), PC5 medium access control (MAC) control element (MAC-CE), or PC5 radio resource control (RRC) message.

29. The method according to claim 16, the method further comprising: Transmitting sidelink communication including the mapping indication.

30. A method of wireless communication performed by a network node, the method comprising: Transmitting a mapping indication indicating a mapping between a plurality of network energy saving modes and a plurality of priority rules for sidelink synchronization by a user equipment (UE); And Transmitting a network energy saving mode indication indicating scheduling for one or more of the plurality of network energy saving modes.

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