CN117063534A

CN117063534A - Power saving in side links

Info

Publication number: CN117063534A
Application number: CN202280020361.5A
Authority: CN
Inventors: S·侯赛尼; Y·金; 陈万士; K·帕拉杜古
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2021-03-15
Filing date: 2022-03-15
Publication date: 2023-11-14

Abstract

Various aspects of the present disclosure relate generally to wireless communications. In some aspects, a User Equipment (UE) may receive a power saving indication related to side link communication. The UE may perform a power save operation based at least in part on the power save indication. Numerous other aspects are described.

Description

Power saving in side links

Cross Reference to Related Applications

This patent application claims priority from U.S. provisional patent application No.63/200,565 entitled "POWER SAVING IN SIDELINK (POWER saving in side link)" filed on day 3, month 15 of 2021, and U.S. non-provisional patent application No.17/654,697 entitled "POWER SAVING IN SIDELINK (POWER saving in side link)" filed on day 3, month 14 of 2022, which are hereby expressly incorporated herein by reference.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for power saving in a side link.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. 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/LTE-advanced is an enhancement set to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the third generation partnership project (3 GPP).

A wireless network may include several Base Stations (BSs) capable of supporting several User Equipment (UE) communications. The UE may communicate with the BS via the downlink and uplink. "downlink" (or "forward link") refers to the communication link from the BS to the UE, and "uplink" (or "reverse link") refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a node B, a gNB, an Access Point (AP), a radio head, a transmission-reception point (TRP), a New Radio (NR) BS, a 5G B node, and so on.

The above multiple access techniques have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the urban, national, regional, and even global level. NR (which may also be referred to as 5G) is an enhanced set of LTE mobile standards promulgated by 3 GPP. NR is designed to better support mobile broadband internet access by using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the Downlink (DL) (CP-OFDM), CP-OFDM and/or SC-FDM on the Uplink (UL) (e.g., also known as discrete fourier transform spread OFDM (DFT-s-OFDM)), and supporting beamforming, multiple Input Multiple Output (MIMO) antenna technology and carrier aggregation to improve spectral efficiency, reduce cost, improve service, utilize new spectrum, and integrate better with other open standards. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR and other radio access technologies remain useful.

SUMMARY

In some aspects, a User Equipment (UE) for wireless communication includes: a memory and one or more processors coupled to the memory, the one or more processors configured to: receiving a power saving indication associated with side link communication; and performing a power saving operation based at least in part on the power saving indication. The power saving indication may indicate that there is no longer side link data that the UE will receive from another UE.

In some aspects, a network entity for wireless communication comprises: a memory and one or more processors coupled to the memory, the one or more processors configured to: receiving, from the first UE, an indication that the first UE is not to transmit data to the second UE; and transmitting, to the second UE, a power saving indication related to the side link communication based at least in part on the indication. The indication may be an indication that the first UE will not transmit data to the second UE, or that the first UE does not intend to transmit data to the second UE.

In some aspects, a wireless communication method performed by a UE includes: receiving a power saving indication associated with side link communication; and performing a power saving operation based at least in part on the power saving indication. The power saving indication may indicate that there is no longer side link data that the UE will receive from another UE.

In some aspects, a method of wireless communication performed by a network entity comprises: receiving, from the first UE, an indication that the first UE is not to transmit data to the second UE; and transmitting, to the second UE, a power saving indication related to the side link communication based at least in part on the indication. The indication may be an indication that the first UE will not transmit data to the second UE, or that the first UE does not intend to transmit data to the second UE. The power saving indication may be associated with side link communication.

In some aspects, an apparatus for wireless communication comprises: means for receiving a power saving indication related to side link communication; and means for performing a power saving operation based at least in part on the power saving indication. The power saving indication may indicate that there is no longer side link data that the UE will receive from another UE.

In some aspects, an apparatus for wireless communication comprises: means for receiving, from a first UE, an indication that the first UE will not transmit data to a second UE; and means for transmitting, to the second UE, a power saving indication related to the side link communication based at least in part on the indication. The indication may be an indication that the first UE will not transmit data to the second UE, or that the first UE does not intend to transmit data to the second UE. The power saving indication may be associated with side link communication.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: receiving a power saving indication associated with side link communication; and performing a power saving operation based at least in part on the power saving indication. The power saving indication may indicate that there is no longer side link data that the UE will receive from another UE.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a network entity, cause the network entity to: receiving, from the first UE, an indication that the first UE is not to transmit data to the second UE; and transmitting, to the second UE, a power saving indication related to the side link communication based at least in part on the indication. The indication may be an indication that the first UE will not transmit data to the second UE, or that the first UE does not intend to transmit data to the second UE. The power saving indication may be associated with side link communication.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and description.

The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure 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 features of the concepts disclosed herein, both as to their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying drawings. Each of the figures is provided for the purpose of illustration and description, and is not intended to be limiting of the claims.

While aspects are described in this disclosure by way of illustration of some examples, those skilled in the art will appreciate that such aspects may be implemented in many different arrangements and scenarios. The techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements. For example, some aspects may be implemented via an integrated chip embodiment or other non-module component based device (e.g., an end user device, a vehicle, a communication device, a computing device, industrial equipment, retail/shopping devices, medical devices, or artificial intelligence enabled devices). Aspects may be implemented in a chip-level component, a module component, a non-chip-level component, a device-level component, or a system-level component. Devices incorporating the described aspects and features may include additional components and features for achieving and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include several components (e.g., hardware components including antennas, radio Frequency (RF) chains, power amplifiers, modulators, buffers, processor(s), interleavers, adders, or summers) for analog and digital purposes. The aspects described herein are intended to be practical in a wide variety of devices, components, systems, distributed arrangements, or end user devices of various sizes, shapes, and configurations.

Brief Description of Drawings

So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

Fig. 2 is a diagram illustrating an example in which a base station is in communication with a User Equipment (UE) in a wireless network according to the present disclosure.

Fig. 3 is a diagram illustrating an example of a Discontinuous Reception (DRX) configuration according to the present disclosure.

Fig. 4 is a diagram illustrating an example of side link communication according to the present disclosure.

Fig. 5 is a diagram illustrating an example of side link communication and access link communication according to the present disclosure.

Fig. 6 is a diagram illustrating an example of a side link wakeup signal (WUS) according to the present disclosure.

Fig. 7 is a diagram illustrating an example associated with power saving in a side link according to the present disclosure.

Fig. 8-9 are diagrams illustrating example processes associated with power saving in a side link according to this disclosure.

Fig. 10-11 are diagrams of example apparatuses for wireless communication according to the present disclosure.

Detailed Description

Power efficient side link operation is important to extend the normal run time of devices engaged in side link communications. However, side link communication lacks a robust power saving scheme. Some techniques and devices described herein provide power saving operation in a side link. For example, the UE may receive the power save indication and the UE may perform the power save operation based at least in part on receiving the power save indication. In some aspects, the UE may enter a sleep state based at least in part on receiving a Go To Sleep (GTS) indication for the side link. The GTS indication may indicate that there is no side link data to be transmitted to the UE. Thus, the UE may go to sleep when the UE will not receive side link data. In some aspects, a UE may receive a dynamic indication from another UE that adapts the bandwidth monitored by the UE for the side link. The indication may indicate that another UE is to perform sidelink transmission in only a portion of the sidelink resource pool. Thus, when a sidelink transmission is to occur in a portion of the sidelink resource pool, the UE may monitor a portion of the sidelink resource pool instead of the entire sidelink resource pool. In this way, the UE does not unnecessarily stay awake and/or only monitor a portion of the side link resource pool, thereby saving power at the UE, reducing the UE's dead time, lengthening the time between charges of the UE, and so forth. The UE may receive the power saving indication during an active time of the side chain discontinuous reception operation. Accordingly, the UE may perform power saving operations to save resources that would otherwise be spent when the UE wakes up.

Various aspects of the disclosure are described more fully below with reference to the accompanying drawings. This disclosure may, however, 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 disclosure to those skilled in the art. Based on the teachings herein one skilled in the art will appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such an apparatus or method that is practiced using such structure, functionality, or both as a complement to, or in addition to, the various aspects of the present 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 claims.

Several aspects of a telecommunications system will now be presented with reference to various apparatus and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying 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 such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It should be noted that although aspects may be described herein using terms commonly associated with 5G or NR Radio Access Technologies (RATs), aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and/or RATs after 5G (e.g., 6G).

Fig. 1 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (NR) network and/or an LTE network, etc. or may include elements thereof. Wireless network 100 may include several base stations 110 (shown as BS110a, BS110b, BS110c, and BS110 d) and other network entities. A Base Station (BS) is an entity that communicates with User Equipment (UE) and may also be referred to as an NR BS, node B, gNB, 5G B Node (NB), access point, transmission-reception point (TRP), and so forth. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a coverage area of a BS and/or a BS subsystem serving the coverage area, depending on the context in which the term is used.

The BS may provide communication coverage for a macrocell, a picocell, a femtocell, and/or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A picocell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). The BS for a macro cell may be referred to as a macro BS. The BS for a pico cell may be referred to as a pico BS. The BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in fig. 1, BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102 c. The BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NR BS," "gNB," "TRP," "AP," "node B," "5G NB," and "cell" may be used interchangeably herein.

In some aspects, the term "base station" (e.g., base station 110) or "network entity" may refer to an aggregated base station, a decomposed base station, an Integrated Access and Backhaul (IAB) node, a relay node, and/or one or more components thereof. For example, in some aspects, a "base station" or "network entity" may refer to a Central Unit (CU), a Distributed Unit (DU), a Radio Unit (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 entity" may refer to a device configured to perform one or more functions, such as those described herein in connection with base station 110. In some aspects, the term "base station" or "network entity" may refer to a plurality of devices configured to perform one or more functions. For example, in some distributed systems, each of several different devices (which may be located in the same geographic location or different geographic locations) may be configured to perform, or repeat the performance of, at least a portion of the functionality, and the term "base station" or "network entity" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network entity" may refer to one or more virtual base stations and/or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network entity" may refer to one of the base station functions, but not the other. In this way, a single device may include more than one base station.

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

The wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., BS or UE) and send the transmission of the data to a downstream station (e.g., UE or BS). The relay station may also be a UE that can relay transmissions for other UEs. In the example shown in fig. 1, relay BS110d may communicate with macro BS110a and UE 120d to facilitate communications between BS110a and UE 120 d. The relay BS may also be referred to as a relay station, a relay base station, a relay, etc.

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

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

UEs 120 (e.g., 120a, 120b, 120 c) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may also be called an access terminal, mobile station, subscriber unit, station, etc. The UE may be a cellular telephone (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, a camera, a gaming device, a netbook, a smartbook, a super book, a medical device or equipment, a biometric sensor/device, a wearable device (smart watch, smart garment, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., music or video device, or satellite radio), a vehicle component or sensor, a smart meter/sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

Some UEs may be considered Machine Type Communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and/or location tags, which may communicate with a base station, another device (e.g., a remote device), or some other entity. The wireless node may provide connectivity to or to a network (e.g., a wide area network such as the internet or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered internet of things (IoT) devices and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered Customer Premise Equipment (CPE). UE 120 may be included within a housing that houses components of UE 120, such as processor components and/or memory components. In some aspects, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, and/or electrically coupled.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. RATs may also be referred to as radio technologies, air interfaces, etc. Frequencies may also be referred to as carriers, frequency channels, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

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

Devices of the wireless network 100 may communicate using electromagnetic spectrum that may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices of the wireless network 100 may communicate using an operating frequency band having a first frequency range (FR 1) and/or may communicate using an operating frequency band having a second frequency range (FR 2), the first frequency range (FR 1) may span 410MHz to 7.125GHz, and the second frequency range (FR 2) may span 24.25GHz to 52.6GHz. The frequency between FR1 and FR2 is sometimes referred to as the mid-band frequency. Although a portion of FR1 is greater than 6GHz, FR1 is commonly referred to as the "sub-6 GHz band". Similarly, FR2 is commonly referred to as the "millimeter wave" frequency band, although it is different from the Extremely High Frequency (EHF) frequency band (30 GHz-300 GHz) identified by the International Telecommunications Union (ITU) as the "millimeter wave" frequency band. Thus, unless specifically stated otherwise, it should be understood that, if used herein, the term sub-6 GHz and the like may broadly represent frequencies less than 6GHz, frequencies within FR1, and/or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless specifically stated otherwise, it should be understood that, if used herein, the term "millimeter wave" or the like may broadly refer to frequencies within the EHF band, frequencies within FR2, and/or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and that the techniques described herein are applicable to those modified frequency ranges.

As indicated above, fig. 1 is provided as an example. Other examples may differ from the example described with respect to fig. 1.

Fig. 2 is a diagram illustrating an example 200 in which a base station 110 is in communication with a UE 120 in a wireless network 100 according to the present disclosure. Base station 110 may be equipped with T antennas 234a through 234T, while UE 120 may be equipped with R antennas 252a through 252R, where in general T is 1 and R is 1.

At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more Modulation and Coding Schemes (MCSs) for each UE based at least in part on a Channel Quality Indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-Static Resource Partitioning Information (SRPI)) and control information (e.g., CQI requests, grants, and/or upper layer signaling) and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary Synchronization Signals (PSS) or Secondary Synchronization Signals (SSS)). A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T Modulators (MODs) 232a through 232T. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232T may be transmitted via T antennas 234a through 234T, respectively.

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

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

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

On the uplink, at UE 120, transmit processor 264 may receive and process data from data source 262 and control information from controller/processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and/or CQI). Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, a modulator and demodulator (e.g., MOD/DEMOD 254) of UE 120 may be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulator and/or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., as described with reference to fig. 7-11).

At base station 110, uplink signals from UE 120 as well as other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller/processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. Base station 110 may include a scheduler 246 to schedule UEs 120 for downlink and/or uplink communications. In some aspects, a modulator and demodulator (e.g., MOD/DEMOD 232) of base station 110 may be included in a modem of base station 110. In some aspects, the base station 110 comprises a transceiver. The transceiver may include any combination of antenna(s) 234, modulator and/or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., as described with reference to fig. 7-11).

The controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of fig. 2 may perform one or more techniques associated with power saving in side link Discontinuous Reception (DRX), as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component of fig. 2 may perform or direct operations of, for example, process 800 of fig. 8, process 900 of fig. 9, and/or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and/or memory 282 may include: a non-transitory computer readable medium storing one or more instructions (e.g., code and/or program code) for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and/or UE 120 (e.g., directly, or after compilation, conversion, and/or interpretation), may cause the one or more processors, UE 120, and/or base station 110 to perform or direct operations such as process 800 of fig. 8, process 900 of fig. 9, and/or other processes described herein. In some aspects, executing instructions may include executing instructions, converting instructions, compiling instructions, and/or interpreting instructions, among others.

In some aspects, the UE includes: means for receiving a power saving indication related to side link communication; and/or means for performing a power saving operation based at least in part on the power saving indication. In some aspects, the UE includes: means for transmitting a power saving indication related to side link communication to another UE. Means for a UE to perform the operations described herein may include, for example, one or more of the antennas 252, the demodulator 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the modulator 254, the controller/processor 280, or the memory 282.

In some aspects, the base station comprises: means for receiving, from a first UE, an indication that the first UE will not transmit data to a second UE; and/or means for transmitting a power saving indication to the second UE based at least in part on the indication. Means for a base station to perform the operations described herein can include, for example, one or more of the transmit processor 220, the TX MIMO processor 230, the modulator 232, the antenna 234, the demodulator 232, the MIMO detector 236, the receive processor 238, the controller/processor 240, the memory 242, or the scheduler 246.

In some aspects, the base station comprises: means for determining that the first UE does not have data for transmission to the second UE based at least in part on the buffer status report.

Although the blocks in fig. 2 are illustrated as distinct components, the functionality described above with respect to the blocks may be implemented in a single hardware, software, or combination of components or a combination of various components. For example, the functions described with respect to transmit processor 264, receive processor 258, and/or TX MIMO processor 266 may be performed by controller/processor 280 or under the control of controller/processor 280.

As indicated above, fig. 2 is provided as an example. Other examples may differ from the example described with respect to fig. 2.

Fig. 3 is a diagram illustrating an example 300 of a DRX configuration according to the present disclosure.

As shown in fig. 3, base station 110 may transmit a DRX configuration to UE 120 to configure DRX cycle 305 for UE 120 (e.g., NR supports DRX to achieve power savings for access link communications). DRX cycle 305 may include DRX on duration 310 (e.g., during which UE 120 is in an awake or active state) and opportunities to enter DRX sleep state 315 (or sleep mode). As used herein, the time during which UE 120 is configured to be in an active state during DRX on duration 310 may be referred to as an active time or active duration, and the time during which UE 120 is configured to be in DRX sleep state 315 may be referred to as an inactive time or an inactive duration. As described below, UE 120 may monitor a Physical Downlink Control Channel (PDCCH) during active times and may refrain from monitoring the PDCCH during inactive times.

During DRX on duration 310 (e.g., active time), UE 120 may monitor a downlink control channel (e.g., PDCCH), as shown by reference numeral 320. For example, UE 120 may monitor the PDCCH for Downlink Control Information (DCI) related to UE 120. If during DRX on duration 120, UE 120 does not detect and/or successfully decode any PDCCH communications intended for UE 310, UE 120 may go to sleep state 310 (e.g., for an inactive time) at the end of DRX on duration 315, as shown by reference numeral 325. In this way, UE 120 may conserve battery power and reduce power consumption. As shown, the DRX cycle 305 may be repeated with a configured periodicity according to the DRX configuration.

If UE 120 detects and/or successfully decodes PDCCH communications intended for UE 120, UE 120 may remain in an active state (e.g., awake) for the duration of DRX inactivity timer 330 (e.g., which may extend the active time). UE 120 may start DRX inactivity timer 330 at the time the PDCCH communication is received (e.g., in a Transmission Time Interval (TTI), such as a slot or subframe, in which the PDCCH communication is received). UE 120 may remain in the active state until DRX inactivity timer 330 expires, at which point UE 120 may go to sleep state 315 (e.g., during an inactivity time), as shown by reference numeral 335. During the duration of DRX inactivity timer 330, UE 120 may continue to monitor PDCCH communications, may obtain downlink data communications scheduled by PDCCH communications (e.g., on a downlink data channel such as a Physical Downlink Shared Channel (PDSCH)), and/or may prepare and/or transmit uplink communications scheduled by PDCCH communications (e.g., on a Physical Uplink Shared Channel (PUSCH)). UE 120 may restart DRX inactivity timer 330 after each detection of PDCCH communication for UE 120 for an initial transmission (e.g., instead of for retransmission). By operating in this manner, UE 120 may conserve battery power and reduce power consumption by going to sleep state 315.

In addition, as shown, UE 120 may be configured to use a short DRX cycle 340 and a long DRX cycle 345. The long DRX cycle 345 may be associated with a longer duration between DRX on durations in which the UE 120 is in a sleep state compared to the short DRX cycle 340. In some examples, the on duration of the short DRX cycle 340 and the long DRX cycle 345 may be the same duration. UE 120 may be configured to use short DRX cycle 340 (e.g., using a parameter DRX short cycle timer) until expiration of short cycle timer 350. After expiration of the short cycle timer 350, the UE 120 may switch to using the long DRX cycle 345.

As indicated above, fig. 3 is provided as an example. Other examples may differ from the example described with respect to fig. 3.

Fig. 4 is a diagram illustrating an example 400 of side link communication according to the present disclosure.

As shown in fig. 4, a first UE 405-1 may communicate with a second UE 405-2 (and one or more other UEs) via one or more side link channels 410. The UEs 405-1 and 405-2 may communicate using one or more side link channels 410 for P2P communications, D2D communications, V2X communications (e.g., which may include V2V communications and/or V2I communications), and/or mesh networking. In some examples, UE 405 (e.g., UE 405-1 and/or UE 405-2) may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some examples, one or more side-link channels 410 may use a PC5 interface and/or may operate in a high frequency band (e.g., 5.9GHz band). Additionally or alternatively, the UE 405 may synchronize the timing of the TTI (e.g., frame, subframe, slot, or symbol) using Global Navigation Satellite System (GNSS) timing.

As further shown in fig. 4, the one or more side link channels 410 may include a physical side link control channel (PSCCH) 415, a physical side link shared channel (PSSCH) 420, and/or a physical side link feedback channel (PSFCH) 425.PSCCH 415 may be used to convey control information similar to a PDCCH and/or Physical Uplink Control Channel (PUCCH) used for cellular communication with base station 110 via an access link or access channel. PSCCH 420 may be used to communicate data similar to PDSCH and/or PUSCH used for cellular communication with base station 110 via an access link or access channel. For example, PSCCH 415 may carry side link control information (SCI) 430, which may indicate various control information for side link communications, such as one or more resources (e.g., time resources, frequency resources, and/or spatial resources), where Transport Blocks (TBs) 435 may be carried on PSCCH 420. TB 435 may include data. The PSFCH 425 may be used to communicate side chain feedback 440, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK/NACK) information), transmit Power Control (TPC), and/or Scheduling Request (SR).

In some examples, one or more side-link channels 410 may use a pool of resources. For example, a particular Resource Block (RB) may be used across time to transmit a scheduling assignment in a subchannel (e.g., included in SCI 430). In some examples, the data transmission associated with the scheduling assignment (e.g., on PSSCH 420) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some examples, the scheduling assignment and associated data transmission are not transmitted on adjacent RBs.

In some examples, the UE 405 may operate using a resource selection and/or scheduling transmission mode performed by the base station 110 (e.g., the base station 110 schedules side-chain communications in the PDCCH). This mode may be referred to as mode 1. In some examples, the UE 405 may operate using a resource selection and/or scheduling transmission mode performed by the UE 405 (e.g., rather than the base station 110). This mode may be referred to as mode 2.

In a transmission mode performed by the UE 405, the UE 405 may perform resource selection and/or scheduling by sensing channel availability for transmission. For example, the UE 405 may measure RSSI parameters (e.g., side link-RSSI (S-RSSI) parameters) associated with various side link channels; RSRP parameters associated with various side link channels (e.g., PSSCH-RSRP parameters) may be measured; and/or RSRQ parameters associated with various side link channels (e.g., PSSCH-RSRQ parameters) may be measured; and a channel for transmitting side-link communications may be selected based at least in part on the measurement(s).

Additionally or alternatively, UE 405 may perform resource selection and/or scheduling using SCI 430 (which may indicate occupied resources and/or channel parameters) received in PSCCH 415. Additionally or alternatively, the UE 405 may perform resource selection and/or scheduling by determining a Channel Busy Rate (CBR) associated with various side chain channels, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 405 may use for a particular set of subframes).

In a transmission mode performed by UE 405 for resource selection and/or scheduling, UE 405 may generate side chain grants and may transmit these grants in SCI 430. The side-link grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for the upcoming side-link transmission, such as one or more resource blocks to be used for the upcoming side-link transmission on PSSCH 420 (e.g., for TB 435), one or more subframes to be used for the upcoming side-link transmission, and/or an MCS to be used for the upcoming side-link transmission. In some aspects, the UE 405 may generate a side link grant indicating one or more parameters for semi-persistent scheduling (SPS), such as periodicity of the side link transmission. Additionally or alternatively, the UE 405 may generate side chain grants for event driven scheduling (such as for on-demand side chain messages).

In some aspects, the UE 405 may use a two-stage SCI, where the SCI is provided in the first stage and the second stage. The first stage may be referred to as SCI-1 and the second stage may be referred to as SCI-2.SCI-1 may be transmitted on the PSCCH. SCI-1 may indicate UE resource reservation. Additionally or alternatively, SCI-1 may include resource allocation and may include information for decoding SCI-2 (e.g., format of SCI-2 and/or other information). The resource allocation may indicate resources for SCI-2. SCI-2 may be transmitted on the PSSCH. SCI-2 may include information for decoding the PSSCH.

As indicated above, fig. 4 is provided as an example. Other examples may differ from the example described with respect to fig. 4.

Fig. 5 is a diagram illustrating an example 500 of side link communication and access link communication according to the present disclosure.

As shown in fig. 5, a transmitting (Tx)/receiving (Rx) UE 505 and an Rx/Tx UE 510 may communicate with each other via a side link, as described above in connection with fig. 4. As further shown, in some side link modes, the base station 110 may communicate with the Tx/Rx UE 505 via a first access link. Additionally or alternatively, in some sidelink modes, the base station 110 may communicate with the Rx/Tx UE 510 via a second access link. The Tx/Rx UE 505 and/or the Rx/Tx UE 510 may correspond to one or more UEs described elsewhere herein, such as UE 120 of fig. 1. Thus, the direct link between UEs 120 (e.g., via a PC5 interface) may be referred to as a side link, and the direct link between base station 110 and UEs 120 (e.g., via a Uu interface) may be referred to as an access link. The side link communication may be transmitted via a side link and the access link communication may be transmitted via an access link. The access link communication may be a downlink communication (from base station 110 to UE 120) or an uplink communication (from UE 120 to base station 110).

As indicated above, fig. 5 is provided as an example. Other examples may differ from the example described with respect to fig. 5.

Fig. 6 is a diagram illustrating an example 600 of a side link wakeup signal (WUS) according to the present disclosure.

As described above in connection with fig. 3, side link communication may support DRX. For example, UEs engaged in sidelink communications may wake up during DRX active durations, as described above. As described above, the inactivity timer may be used to keep the UE awake (e.g., in an active state) outside of the configured DRX active duration (e.g., if a peer UE has additional transmissions for the UE). For example, if a non-zero inactivity timer is configured for a UE, and if the UE receives a SCI indicating resource reservation/transmission outside of the configured activity duration of the UE, the UE may extend the activity duration (e.g., up to the duration of the inactivity timer). Otherwise, the UE may go to sleep.

In addition, side link DRX may utilize side link WUS. Here, the UE may temporarily transition from the sleep state (e.g., by activating one or more modules and/or components, such as a baseband processor) during the inactive time of the UE to monitor WUS during a period of time (e.g., WUS monitoring occasions that are outside of the DRX active time). WUS may indicate whether the UE is to wake up during the next DRX on duration. If the UE does not detect the presence of WUS during the period, the UE may return to a sleep state until the UE monitors WUS again. If the UE detects the presence of WUS, the UE may transition to an active state (e.g., in a DRX on duration) to receive side-chain communications (e.g., PSCCH communications, PSSCH communications, etc.).

In this way, WUS enables the UE to refrain from waking up during DRX active time if there is no data for the UE to receive (e.g., the UE does not wake up unnecessarily). For example, if the first UE has data to transmit to the second UE, the first UE may transmit an indication to the second UE as WUS (e.g., in WUS opportunities). Upon receiving WUS, the second UE may wake up and monitor the side chain resource pool resources for data.

As indicated above, fig. 6 is provided as an example. Other examples may differ from the example described with respect to fig. 6.

In access link communications, a UE may use one or more schemes to achieve power savings. In one example, the UE may use PDCCH skipping to save power. Here, the base station may indicate to the UE that the UE may skip monitoring the PDCCH for a particular time duration. Thus, during the time duration, the UE does not transmit or receive dynamically granted channels. In another example, the base station may indicate to the UE that the UE may switch from the current search space to the new search space for PDCCH monitoring, rather than skipping PDCCH monitoring. Here, the new search space may be associated with a larger periodicity of PDCCH candidates than the current search space.

As described above, side-link communications are widely used for various use cases, such as for communications involving smart wearable devices, ioT, reduced-capability devices, and/or industrial IoT. Thus, power efficient side link operation is important to extend the normal run time of devices engaged in side link communications. However, side link communications lack robust power saving schemes, such as those described above for access link communications. Some techniques and devices described herein provide power saving operation in a side link. In some aspects, the UE may enter a sleep state based at least in part on receiving a Go To Sleep (GTS) indication for the side link. In some aspects, a UE may receive a dynamic indication from another UE that adapts the bandwidth monitored by the UE for the side link. In this way, the UE does not unnecessarily stay awake and/or only monitor a portion of the side link resource pool, thereby saving power at the UE, reducing the UE's dead time, lengthening the time between charges of the UE, and so forth.

Fig. 7 is a diagram illustrating an example 700 associated with power saving in a side link according to the present disclosure. As shown in fig. 7, first UE 120-1 and second UE 120-2 may communicate with each other (e.g., via a side link) and/or base station 110 and second UE 120-2 may communicate with each other (e.g., via an access link). In some aspects, base station 110, first UE 120-1, and/or second UE 120-2 may be included in a wireless network, such as wireless network 100. In some aspects, the first UE 120-1 and the second UE 120-2 may be included in a wireless side link network (such as an ad hoc network).

As shown by reference numeral 705, the base station 110 may transmit and the second UE 120-2 may receive the DRX configuration. The DRX configuration may be used for side link DRX, as described above. For example, the side link DRX configuration may configure on duration, inactivity timers, DRX cycles, etc., as described above. In some aspects, the side link DRX configuration or another configuration may configure the side link WUS (e.g., WUS monitors the position of the occasion) for side link DRX. In some aspects, the second UE 120-2 may receive DRX configuration (and/or other configurations) from the first UE 120-1.

The second UE 120-2 may perform DRX operation based at least in part on the DRX configuration (and/or other configurations). For example, the second UE 120-2 may transition between an awake state (e.g., active state) and a sleep state (e.g., inactive state) according to a DRX configuration (and/or other configurations). A "sleep state" may refer to a state of a UE having a particular set of parameters for the UE, such as parameters set to power down an antenna panel, power down circuitry associated with the antenna panel, power down circuitry associated with monitoring signals received at the antenna panel, reduce received power relative to a non-sleep state (e.g., an awake state), refrain from monitoring received signals, deactivate one or more component carriers, and so forth.

As indicated by reference numeral 710, the second UE 120-2 may receive a power save indication. The second UE 120-2 may receive the power saving indication from the base station 110 and/or from the first UE 120-1 (e.g., the base station 110 and/or the first UE 120-1 may transmit the power saving indication). For example, in some aspects, the first UE 120-1 may transmit a power saving indication to the second UE 120-2. The power saving indication may be associated with side link communication of the second UE 120-2. For example, the power saving indication may be associated with one or more side links (e.g., one or more side link sessions, each side link session associated with a different source identifier and/or destination identifier) of the second UE 120-2 with one or more other UEs (e.g., the first UE 120-1), as described below). The second UE 120-2 may receive the power saving indication (e.g., according to a DRX configuration) during a side link DRX active time of a side link DRX operation performed by the second UE 120-2. However, in some aspects, the second UE 120-2 may receive the power saving indication during another period of time and/or whether or not DRX is configured for the second UE 120-2.

In some aspects, the power saving indication may include a GTS indication. The GTS indication (e.g., GTS signal) may indicate that the second UE 120-2 is not to (e.g., will not) receive side link data (e.g., there is no longer side link data that the second UE 120-2 will receive from another UE, such as the first UE 120-1). For example, base station 110 and/or first UE 120-1 may transmit a GTS indication to second UE 120-2 indicating that first UE 120-1 no longer has side link data for transmission to second UE 120-2. Thus, the power saving indication may indicate that the second UE 120-2 is not to (e.g., will not) receive side link data (e.g., there is no longer side link data that the second UE 120-2 will receive from another UE, such as the first UE 120-1).

Accordingly, the GTS indication may indicate that the second UE 120-2 may go to sleep (e.g., go to sleep state). That is, the GTS indication may indicate that the second UE 120-2 may refrain from monitoring the PSCCH and/or the PSSCH. In some aspects, the GTS indication may indicate (e.g., using a single bit) whether the second UE 120-2 may go to sleep (e.g., indicate whether the second UE 120-2 is to receive side link data). Additionally or alternatively, the GTS indication may indicate a time duration within which the second UE 120-2 is to sleep.

In some aspects, the time duration may be a remaining portion of the DRX active time for which the GTS indication is received (i.e., the current DRX active time). For example, the GTS indication may indicate that the second UE 120-2 is to skip the remainder of the current DRX active time and that the second UE 120-2 is to operate in a sleep state until the next DRX active time. In some aspects, the time duration may be a number of time intervals (e.g., slots) of a current DRX active time. For example, the GTS indication may indicate that the second UE 120-2 is to skip (e.g., operate in sleep state within) a portion of a time interval (e.g., slot) in the current DRX active time. The time intervals may be coherent or non-coherent. In some aspects, the time duration may be a plurality of DRX active times. For example, the GTS indication may indicate the number of DRX active times that the second UE 120-2 is to skip (e.g., operate in a sleep state).

In some aspects, the time duration may be indicated by a semi-static configuration (e.g., a Radio Resource Control (RRC) configuration) of the second UE 120-2 and/or by a fixed rule (e.g., a rule indicating that the second UE 120-2 is to wake up within a next DRX cycle, or a rule indicating any of the other time durations described above). For example, the GTS indication may only indicate whether the second UE 120-2 is to receive side link data (e.g., single bit indication), as described above, and the second UE 120-2 may determine the time duration according to semi-static configurations and/or rules. In some aspects, the semi-static configuration and/or rules are specific to the side link resource pool in which the second UE 120-2 is communicating (e.g., different side link resource pools may be associated with different configurations and/or rules). In some aspects, the GTS indication may indicate that the second UE 120-2 is to sleep (e.g., skip monitoring PSCCH and/or PSSCH) until a next WUS monitoring occasion for DRX operation.

In some aspects, the power saving indication may include a bandwidth indication (e.g., indicating a bandwidth adaptation). For example, second UE 120-2 may receive the bandwidth indication instead of the GTS indication (e.g., second UE 120-2 may receive the bandwidth indication from base station 110 and/or first UE 120-1 when first UE 120-1 has side link data for transmission to second UE 120-2). The bandwidth indication may indicate that the sidelink transmission from the first UE 120-1 to the second UE 120-2 will occur only in a portion of the bandwidth of the sidelink resource pool (e.g., in a narrower bandwidth than the entire bandwidth of the sidelink resource pool). As an example, the first UE 120-1 may transmit a bandwidth indication to the second UE 120-2, and the bandwidth indication may indicate that the first UE 120-1 is to transmit to the second UE 120-2 only through the portion of the bandwidth of the side chain resource pool. Thus, transmissions from the first UE 120-1 to the second UE 120-2 (e.g., according to the bandwidth indication) may use only resources in the narrower bandwidth indicated by the bandwidth indication. However, the first UE 120-1 (e.g., when operating in mode 2 for side link resource allocation) may still monitor the entire bandwidth of the side link resource pool to obtain resource reservation information associated with other UEs.

In some aspects, the power saving indication (e.g., a GTS indication and/or a bandwidth indication) may be a sequence-based indication. That is, the power saving indication (e.g., transmitted by the first UE 120-1) may be carried by a sequence. In some aspects, specific time and frequency resources in a side chain resource pool may be allocated for transmission and/or reception of power saving indications (e.g., GTS indications). The opportunity to transmit and/or monitor a power saving indication (e.g., a particular time and frequency resource) may be based at least in part on (e.g., dependent on) a source identifier associated with the power saving indication (e.g., an identifier of the first UE 120-1), a destination identifier associated with the power saving indication (e.g., an identifier of the second UE 120-1), a broadcast type associated with the power saving indication (e.g., unicast, multicast, broadcast, etc.), and/or a zone identifier associated with the first UE 120-1 and/or the second UE 120-2 (e.g., the zone identifier identifies a geographic region).

In some aspects, a power saving indication (e.g., a GTS indication) may be indicated by a sequence. For example, a particular command indicated by the power saving indication (e.g., whether the second UE 120-2 is to receive side link data, a time duration for which the second UE 120-2 is to sleep, etc.) may be indicated by the sequence. In some aspects, the particular command indicated by the power saving indication or a portion thereof may be implied by the transmission of the sequence. For example, the specific command or a portion thereof may be a function of a time interval (e.g., a time slot) for transmitting the power saving indication.

In some aspects, a power saving indication (e.g., a GTS indication and/or a bandwidth indication) may be indicated in the communication of the PSCCH or PSSCH (e.g., the power saving indication may be PSCCH-based and/or PSSCH-based). For example, the power saving indication may be included in a SCI, such as SCI-1 (e.g., transmitted in PSCCH) or SCI-2 (e.g., transmitted in PSSCH), or in a medium access control element (MAC-CE) (e.g., transmitted in PSSCH). As an example, the data transmission from the first UE 120-1 to the second UE 120-2 may additionally include a power saving indication (e.g., including a GTS indication indicating a time duration).

In some aspects, a power saving indication (e.g., a GTS indication and/or a bandwidth indication) may identify a source identifier (e.g., a source UE side link identifier) associated with the power saving indication and/or a destination identifier (e.g., a destination UE side link identifier) associated with the power saving indication. The source identifier may be associated with a UE (e.g., first UE 120-1) that transmits the power saving indication and the destination identifier may be associated with a UE (e.g., second UE 120-2) that receives the power saving indication. In the side link, communications across the UE are identified by a source identifier and a destination identifier. Further, the source identifier and the destination identifier may be specific to a particular link (i.e., a particular side link session). For example, the first UE 120-1 and the second UE 120-2 may engage in communication via two different applications, each application associated with a respective link/side link session, and the source identifier and destination identifier for the first UE 120-1 and the second UE 120-2 may be different for the respective link/side link session.

In some aspects, when the Uu (i.e., access link) identity of the second UE 120-2 is known to the base station 110, the second UE 120-2 may receive a power save indication (e.g., a GTS indication and/or a bandwidth indication) from the base station 110. In side-link mode 1 resource allocation, as described above, base station 110 may be aware of the destination identifier (e.g., sl-destination identity-r16 (sl-DestinationIdentity-r 16)) of the receiver-side link UE (e.g., second UE 120-2) (e.g., store information indicating the destination identifier). However, in general, the base station 110 may not be aware of the association between the destination identifier and the Uu identity of the receiver-side link UE (e.g., may not store information indicating the association). In some aspects, the base station 110 may store information indicating an association between the destination identifier of the second UE 120-2 and the Uu identity of the second UE 120-2. For example, the first UE 120-1 and the second UE 120-2 may exchange information identifying respective Uu identities of the first UE 120-1 and the second UE 120-2 (e.g., exchange access link identity information), and the first UE 120-1 may transmit information indicating the Uu identity of the second UE 120-2 to the base station 110 (e.g., in combination with transmitting information indicating a destination identifier of the second UE 120-2). That is, the first UE 120-1 may transmit and the base station 110 may receive information identifying a sidelink destination identifier associated with the second UE 120-2 and an access link identity associated with the second UE 120-2 (e.g., the information obtained by the first UE 120-1 during exchange of sidelink identity information between the first UE 120-1 and the second UE 120-2).

In some aspects, the first UE 120-1 may transmit and the base station 110 may receive an indication that the first UE 120-1 does not (e.g., will not or is not intended to) transmit data to the second UE 120-2 (e.g., an indication that the first UE 120-1 does not have data for transmission to the second UE 120-2). That is, the indication may be an indication that the first UE will not transmit data to the second UE, or that the first UE does not intend to transmit data to the second UE. In some aspects, the indication may indicate that the first UE 120-1 is to transmit data (e.g., in a portion of the bandwidth of the side link resource pool) to the second UE 120-2. Thus, the indication may indicate whether the first UE 120-1 is to transmit data to the second UE 120-2. In some aspects, the indication may identify a side link destination identifier and an access link identity associated with the second UE 120-2 (e.g., obtained by the first UE 120-1 during exchange of side link identity information between the first UE 120-1 and the second UE 120-2). In some aspects, the indication may be a side link buffer status report (e.g., the base station 110 may receive the side link buffer status report from the first UE 120-1). Base station 110 may determine (e.g., infer) that first UE 120-1 does not have data for transmission to second UE 120-2 based, at least in part, on the buffer status report. For example, base station 110 may determine that the buffer status report does not indicate data for transmission to a destination identifier associated with second UE 120-2. In some aspects, the indication may explicitly indicate that the first UE 120-1 does not have data for transmission to the second UE 120-2. For example, the explicit indication may be transmitted by the first UE 120-1 via signaling designated to indicate lack of data for transmission. As another example, the explicit indication may be an indication of an empty buffer at the first UE 120-1 (e.g., a BSR0 message transmitted by the first UE 120-1).

Based at least in part on receiving the indication from the first UE 120-1, the base station 110 may transmit a power save indication (e.g., a GTS indication) to the second UE 120-2. For example, the base station 110 may transmit a power saving indication to the second UE 120-2 based at least in part on an association between the side chain destination identifier of the second UE 120-2 and the Uu identity of the second UE 120-2. In some aspects, the base station 110 may transmit a power saving indication to the second UE 120-2 in the PDCCH (e.g., using the Uu identity of the second UE 120-2).

As indicated by reference numeral 715, the second UE 120-2 may perform a power save operation based at least in part on the power save indication. A "power saving operation" may refer to one or more operations by which a UE reduces power consumption by the UE (e.g., relative to power consumption by the UE when the one or more operations are not performed).

In some aspects, the second UE 120-2 may enter a sleep state (e.g., transition from an active state to a sleep state) when performing power saving operations. For example, the second UE 120-2 may enter a sleep state (in conjunction with performing power saving operations) based at least in part on receiving a GTS indication from the first UE 120-1 or the base station 110. In the sleep state, the second UE 120-2 may refrain from monitoring the PSCCH and/or the PSSCH. In this way, the second UE 120-2 may reduce power consumption. The second UE 120-2 may remain in the sleep state for the time duration associated with the GTS indication, as described above. Thus, the second UE 120-2 may transition from the sleep state to the active state upon expiration of the time duration.

In some aspects, in a sleep state (e.g., during a sleep duration), the second UE 120-2 may monitor WUS monitoring occasions associated with a UE (e.g., the first UE 120-1) transmitting the power saving indication. In some aspects, in a sleep state (e.g., during a sleep duration), the second UE 120-2 may refrain from monitoring (e.g., skip monitoring) WUS monitoring occasions associated with the UE transmitting the power saving indication (e.g., the first UE 120-1) for a time duration associated with the GTS indication. . In some aspects, the second UE 120-2 may receive an indication from the base station 110 and/or the first UE 120-1 as to whether the second UE 120-2 is to monitor WUS monitoring occasions in a sleep state (e.g., during a sleep duration). For example, the power saving indication may indicate whether the second UE 120-2 is to monitor WUS occasions during the sleep duration.

In some aspects, the second UE 120-2 may enter a sleep state based at least in part on acknowledgement feedback that conveys an indication of power saving (e.g., received in SCI, in sequence, in PSCCH communication, in PSSCH communication, etc.). For example, when the second UE 120-2 receives the power saving indication in an SCI (e.g., SCI-1 and/or SCI-2), the second UE 120-2 may enter a sleep state based at least in part on transmitting acknowledgement feedback for the SCI (e.g., for a transport block associated with the SCI). In other words, the second UE 120-2 may enter the sleep state only if the second UE 120-2 transmits acknowledgement feedback for the SCI. In this way, if the second UE 120-2 does not properly receive the SCI including the power save indication (e.g., the second UE 120-2 transmitted negative acknowledgement feedback for the SCI), the second UE 120-2 may remain in an active state to receive retransmissions of the SCI from the first UE 120-1.

In some aspects, the second UE 120-2 may enter a sleep state based at least in part on determining that the second UE 120-2 (e.g., during a current DRX active time) received a GTS indication for each link/side link session of the second UE 120-2. That is, if there is at least one link/sidelink session of the second UE 120-2 for which the second UE 120-2 did not receive the GTS indication (e.g., during the current DRX active time), the second UE 120-2 may refrain from going to sleep state (even if the GTS indication is received).

In some aspects, the second UE 120-2 may monitor the PSCCH and/or PSSCH only in a portion of the bandwidth of the side link resource pool (e.g., in a narrower bandwidth than the entire bandwidth of the side link resource pool) when performing power saving operations. For example, the second UE 120-2 may monitor the PSCCH and/or PSSCH (in conjunction with performing power save operations) in only a portion of the bandwidth based at least in part on receiving the bandwidth indication from the first UE 120. In this way, the second UE 120-2 may refrain from monitoring the SCI outside of the narrower bandwidth (which may be considered as the side-chain counterpart of the search space handoff for the access link described above). Accordingly, the second UE 120-2 may conserve power by reducing RF bandwidth and receiving and/or transmitting over a relatively small portion of the side chain resource pool.

The portion of bandwidth to be monitored by the second UE 120-2 may be indicated by the bandwidth indication, as described above. As described above, the second UE 120-2 may continue to monitor only a portion of the bandwidth until a new bandwidth indication is received or for a particular time duration (e.g., the second UE 120-2 may return to monitoring the entire bandwidth if indicated by the new bandwidth indication or upon expiration of the time duration). The second UE 120-2 may receive the side link data transmission from the first UE 120-1 in a portion of the bandwidth.

As indicated above, fig. 7 is provided as an example. Other examples may differ from the example described with respect to fig. 7.

Fig. 8 is a diagram illustrating an example process 800 performed, for example, by a UE, in accordance with the present disclosure. Example process 800 is an example in which a UE (e.g., UE 120) performs operations associated with power saving in a side chain.

As shown in fig. 8, in some aspects, process 800 includes: a power saving indication associated with side link communication is received (block 810). For example, the UE (e.g., using the receiving component 1002 depicted in fig. 10) may receive a power saving indication related to side link communication, as described above.

As further shown in fig. 8, in some aspects, process 800 includes: a power saving operation is performed based at least in part on the power saving indication (block 820). For example, the UE (e.g., using the monitoring component 1008 depicted in fig. 10) may perform power save operations based at least in part on the power save indication, as described above.

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

In a first aspect, the power saving indication is received during an active time of a sidelink discontinuous reception operation.

In a second aspect, alone or in combination with the first aspect, the power saving indication is received from another UE or a base station.

In a third aspect, alone or in combination with one or more of the first and second aspects, the power saving indication is received in side link control information, and the power saving operation is performed based at least in part on transmitting acknowledgement feedback for the side link control information.

In a fourth aspect, alone or in combination with one or more of the first to third aspects, the power saving indication is a sequence-based indication.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the power saving indication is indicated in the communication of a physical side link control channel or a physical side link shared channel.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the power saving indication identifies at least one of a source identifier or a destination identifier associated with the power saving indication.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the power saving operation is to go to sleep.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the power saving indication indicates that the UE is not to receive data from another UE.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the power saving indication indicates a duration that the UE is to sleep.

In a tenth aspect, in combination with the ninth aspect, the duration is the remainder of the active time of the side link discontinuous reception operation.

In an eleventh aspect, in combination with one or more of the first to ninth aspects, the duration is a number of time intervals of active time of the side link discontinuous reception operation.

In a twelfth aspect, in combination with one or more of the first to ninth aspects, the duration is a plurality of active times of the side link discontinuous reception operation.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the UE indicates a duration of sleep by a semi-static configuration or fixed rule based at least in part on receiving the power saving indication.

In a fourteenth aspect, in combination with the thirteenth aspect, the semi-static configuration or the fixed rule is specific to a side link resource pool.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the UE will sleep, based at least in part on receiving the power saving indication, until a next wake-up signal opportunity for side-link discontinuous reception operation.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, performing the power saving operation comprises: monitoring wake-up signal occasions during the sleep duration of the UE is suppressed.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, performing the power saving operation comprises: wake-up signal opportunities are monitored during a sleep duration of the UE.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the power saving indication further indicates whether the UE is to monitor for wake-up signal occasions during a sleep duration of the UE.

In a ninth aspect, alone or in combination with one or more of the first through eighteenth aspects, the power saving indication indicates that the side link transmission is to occur in a portion of a bandwidth of the side link resource pool.

In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, performing the power saving operation comprises: the physical side link control channel or physical side link shared channel is monitored only in a portion of the bandwidth of the side link resource pool.

While fig. 8 shows example blocks of the process 800, in some aspects, the process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than depicted in fig. 8. Additionally or alternatively, two or more blocks of process 800 may be performed in parallel.

Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a base station, in accordance with the present disclosure. The example process 900 is an example in which a base station (e.g., the base station 110) performs operations associated with power saving in a side link.

As shown in fig. 9, in some aspects, process 900 includes: an indication is received from a first UE that the first UE is not to transmit data to a second UE (block 910). The indication may be an indication that the first UE will not transmit data to the second UE, or that the first UE does not intend to transmit data to the second UE. For example, the base station (e.g., using the receiving component 1102 depicted in fig. 11) may receive an indication from the first UE that the first UE will not transmit data to the second UE, as described above.

As further shown in fig. 9, in some aspects, process 900 includes: a power saving indication is transmitted to the second UE based at least in part on the indication (block 920). The power saving indication may be associated with side link communication. For example, the base station (e.g., using the transmission component 1104 depicted in fig. 11) may transmit a power save indication to the second UE based at least in part on the indication, as described above.

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

In a first aspect, the indication is a buffer status report.

In a second aspect, in combination with the first aspect, the process 900 includes: the method further includes determining that the first UE does not have data for transmission to the second UE based at least in part on the buffer status report.

In a third aspect, alone or in combination with one or more of the first and second aspects, the indication indicates that the first UE does not have data for transmission to the second UE.

In a fourth aspect, alone or in combination with one or more of the first to third aspects, the power saving indication is transmitted during an active time of a sidelink discontinuous reception operation of the second UE.

In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the power saving indication is transmitted in a physical downlink control channel.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the power saving indication indicates that the second UE is not to receive data from the first UE.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 900 includes: information identifying a side link destination identifier associated with the second UE and an access link identity associated with the second UE is received, the information being obtained by the first UE during exchange of side link identity information between the first UE and the second UE.

While fig. 9 shows example blocks of the process 900, in some aspects, the process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than depicted in fig. 9. Additionally or alternatively, two or more blocks of process 900 may be performed in parallel.

Fig. 10 is an illustration of an example apparatus 1000 for wireless communication in accordance with the present disclosure. The apparatus 1000 may be a UE, or the UE may include the apparatus 1000. In some aspects, the apparatus 1000 includes a receiving component 1002 and a transmitting component 1004 that can be in communication with each other (e.g., via one or more buses and/or one or more other components). As shown, apparatus 1000 may use a receiving component 1002 and a transmitting component 1004 to communicate with another apparatus 1006, such as a UE, a base station, or another wireless communication device. As further shown, the apparatus 1000 may include a monitoring component 1008 as well as other examples.

In some aspects, the apparatus 1000 may be configured to perform one or more operations described herein in connection with fig. 7. Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein (such as process 800 of fig. 8) or a combination thereof. In some aspects, the apparatus 1000 and/or one or more components shown in fig. 10 may include one or more components of the UE described above in connection with fig. 2. Additionally or alternatively, one or more of the components shown in fig. 10 may be implemented within one or more of the components described above in connection with fig. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

The receiving component 1002 can receive a communication (such as a reference signal, control information, data communication, or a combination thereof) from the device 1006. The receiving component 1002 can provide the received communication to one or more other components of the apparatus 1000. In some aspects, the receiving component 1002 can perform signal processing (such as filtering, amplifying, demodulating, analog-to-digital converting, demultiplexing, deinterleaving, demapping, equalizing, interference cancellation or decoding, etc.) on the received communication and can provide the processed signal to one or more other components of the apparatus 1000. In some aspects, the reception component 1002 can include one or more antennas, demodulators, MIMO detectors, reception processors, controllers/processors, memories, or a combination thereof for the UE described above in connection with fig. 2.

The transmission component 1004 can transmit communications (such as reference signals, control information, data communications, or a combination thereof) to the device 1006. In some aspects, one or more other components of apparatus 1000 may generate a communication and may provide the generated communication to transmission component 1004 for transmission to apparatus 1006. In some aspects, transmission component 1004 can perform signal processing (such as filtering, amplifying, modulating, digital-to-analog converting, multiplexing, interleaving, mapping, encoding, etc.) on the generated communication and can transmit the processed signal to device 1006. In some aspects, the transmission component 1004 can include one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers/processors, memories, or combinations thereof of the UE described above in connection with fig. 2. In some aspects, the transmission component 1004 can be co-located with the reception component 1002 in a transceiver.

The receiving component 1002 can receive a power saving indication related to side link communication (e.g., during an active time of side link DRX operation). The monitoring component 1008 can perform a power saving operation based at least in part on the power saving indication. For example, the monitoring component 1008 can refrain from monitoring the PSCCH and/or the PSSCH based at least in part on the power saving indication. As another example, monitoring component 1008 can monitor PSCCH and/or PSSCH in only a portion of bandwidth of a side chain resource pool based at least in part upon the power saving indication.

In some aspects, the transmission component 1004 can transmit a power saving indication related to side link communication to another UE (e.g., during an active time of side link DRX operation of the other UE). In some aspects, the transmission component 1004 can transmit a buffer status report and/or an explicit indication of lack of data for transmission to another UE.

The number and arrangement of components shown in fig. 10 are provided as examples. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in fig. 10. Further, two or more components shown in fig. 10 may be implemented within a single component, or a single component shown in fig. 10 may be implemented as multiple distributed components. Additionally or alternatively, a set of components (e.g., one or more components) shown in fig. 10 may perform one or more functions described as being performed by another set of components shown in fig. 10.

Fig. 11 is an illustration of an example apparatus 1100 for wireless communication according to this disclosure. The apparatus 1100 may be a base station, or the base station may comprise the apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102 and a transmitting component 1104 that can be in communication with each other (e.g., via one or more buses and/or one or more other components). As shown, apparatus 1100 may use a receiving component 1102 and a transmitting component 1104 to communicate with another apparatus 1106, such as a UE, a base station, or another wireless communication device. As further illustrated, apparatus 1100 may include a determination component 1108 and other examples.

In some aspects, the apparatus 1100 may be configured to perform one or more operations described herein in connection with fig. 7. Additionally or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein (such as process 900 of fig. 9) or a combination thereof. In some aspects, apparatus 1100 and/or one or more components shown in fig. 11 may comprise one or more components of a base station described above in connection with fig. 2. Additionally or alternatively, one or more of the components shown in fig. 11 may be implemented within one or more of the components described above in connection with fig. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

The receiving component 1102 can receive a communication (such as a reference signal, control information, data communication, or a combination thereof) from a device 1106. The receiving component 1102 can provide the received communication to one or more other components of the apparatus 1100. In some aspects, the receiving component 1102 can perform signal processing (such as filtering, amplifying, demodulating, analog-to-digital converting, demultiplexing, deinterleaving, demapping, equalizing, interference cancellation or decoding, etc.) on the received communication and can provide the processed signal to one or more other components of the apparatus 1100. In some aspects, the receiving component 1102 can include one or more antennas, demodulators, MIMO detectors, receive processors, controllers/processors, memory, or a combination thereof for a base station as described above in connection with fig. 2.

The transmission component 1104 can transmit a communication (such as a reference signal, control information, data communication, or a combination thereof) to the device 1106. In some aspects, one or more other components of apparatus 1100 may generate a communication and may provide the generated communication to transmission component 1104 for transmission to apparatus 1106. In some aspects, transmission component 1104 can perform signal processing (such as filtering, amplifying, modulating, digital-to-analog converting, multiplexing, interleaving, mapping, encoding, etc.) on the generated communication and can transmit the processed signal to device 1106. In some aspects, the transmission component 1104 may include one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers/processors, memories, or combinations thereof of the base station described above in connection with fig. 2. In some aspects, the transmission component 1104 may be co-located with the reception component 1102 in a transceiver.

The receiving component 1102 may receive an indication from a first UE that the first UE is not to transmit data to a second UE. The transmission component 1104 can transmit a power saving indication to the second UE based at least in part on the indication (e.g., during an active time of side link DRX operation of the second UE).

In some aspects, the indication received from the first UE may be a buffer status report. The determining component 1108 may determine that the first UE does not have data for transmission to the second UE based at least in part on the buffer status report.

The number and arrangement of components shown in fig. 11 are provided as examples. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in fig. 11. Further, two or more components shown in fig. 11 may be implemented within a single component, or a single component shown in fig. 11 may be implemented as multiple distributed components. Additionally or alternatively, a set of components (e.g., one or more components) shown in fig. 11 may perform one or more functions described as being performed by another set of components shown in fig. 11.

The following provides an overview of some aspects of the disclosure:

aspect 1: a method of performing wireless communications by a User Equipment (UE), comprising: receiving a power saving indication associated with side link communication; and performing a power saving operation based at least in part on the power saving indication.

Aspect 2: the method of aspect 1, wherein the power saving indication is received during an active time or on duration of a sidelink discontinuous reception operation.

Aspect 3: the method of any of aspects 1-2, wherein the power saving indication is received from another UE or a network entity.

Aspect 4: the method of any of aspects 1-3, wherein the power saving operation is performed based at least in part on transmitting acknowledgement feedback for the power saving indication.

Aspect 5: the method of any of aspects 1-4, wherein the power saving indication is a sequence-based indication.

Aspect 6: the method of any of aspects 1-5, wherein the power saving indication is indicated in a communication of a physical side link control channel or a physical side link shared channel.

Aspect 7: the method of any of aspects 1-6, wherein the power saving indication identifies at least one of a source identifier or a destination identifier associated with the power saving indication.

Aspect 8: the method of any of aspects 1-7, wherein the power saving operation is an go to sleep state.

Aspect 9: the method of any of aspects 1-8, wherein the power saving indication indicates that the UE is to go to sleep.

Aspect 10: the method of any of aspects 1-9, wherein the power saving indication indicates a duration for which the UE is to sleep.

Aspect 11: the method of aspect 10, wherein the duration is a remaining portion of an active time of the sidelink discontinuous reception operation.

Aspect 12: the method of aspect 10, wherein the duration is a number of time intervals of active time of the sidelink discontinuous reception operation.

Aspect 13: the method of aspect 10, wherein the duration is a plurality of active times of a sidelink discontinuous reception operation.

Aspect 14: the method of any of aspects 1-9, wherein the UE indicates a duration of sleep by a semi-static configuration or a fixed rule based at least in part on receiving the power saving indication.

Aspect 15: the method of aspect 14, wherein the semi-static configuration or the fixed rule is specific to a side link resource pool.

Aspect 16: the method of any of aspects 1-10, wherein the UE is to sleep until a next wake-up signal occasion of a side link discontinuous reception operation based at least in part on receiving the power saving indication.

Aspect 17: the method of any of aspects 1-16, wherein performing the power saving operation comprises: monitoring wake-up signal occasions during the sleep duration of the UE is suppressed.

Aspect 18: the method of any of aspects 1-16, wherein performing the power saving operation comprises: wake-up signal opportunities are monitored during a sleep duration of the UE.

Aspect 19: the method of any of aspects 1-18, wherein the power saving indication further indicates whether the UE is to monitor wake-up signal occasions during a sleep duration of the UE.

Aspect 20: the method of any of aspects 1-7, wherein the power saving indication indicates that the sidelink transmission will occur in a portion of a bandwidth of the sidelink resource pool.

Aspect 21: the method of any of aspects 1-7 or 20, wherein performing the power saving operation comprises: the physical side link control channel or physical side link shared channel is monitored only in a portion of the bandwidth of the side link resource pool.

Aspect 22: a method of wireless communication performed by a network entity, comprising: receiving, from a first User Equipment (UE), an indication that the first UE is not to transmit data to a second UE; and transmitting a power saving indication to the second UE based at least in part on the indication.

Aspect 23: the method of aspect 22, wherein the indication is a buffer status report.

Aspect 24: the method of aspect 23, further comprising: the method further includes determining that the first UE does not have data for transmission to the second UE based at least in part on the buffer status report.

Aspect 25: the method of aspect 22, wherein the indication indicates that the first UE does not have data for transmission to the second UE.

Aspect 26: the method of any of aspects 22-25, wherein the power saving indication is transmitted during an active time or on duration of a sidelink discontinuous reception operation of the second UE.

Aspect 27: the method of any of aspects 22-26, wherein the power saving indication is transmitted in a physical downlink control channel.

Aspect 28: the method of any of aspects 22-27, wherein the power saving indication indicates that the second UE is to go to sleep.

Aspect 29: the method of any of aspects 22-28, further comprising: information identifying a side link destination identifier associated with the second UE and an access link identity associated with the second UE is received from the first UE, the information being obtained by the first UE during exchange of side link identity information between the first UE and the second UE.

Aspect 30: an apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method as in one or more of aspects 1-21.

Aspect 31: an apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more of aspects 1-21.

Aspect 32: an apparatus for wireless communication, comprising at least one means for performing the method of one or more of aspects 1-21.

Aspect 33: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method as one or more of aspects 1-21.

Aspect 34: a non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method as in one or more of aspects 1-21.

Aspect 35: an apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in one or more of aspects 22-29.

Aspect 36: an apparatus for wireless communication comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more of aspects 22-29.

Aspect 37: an apparatus for wireless communication, comprising at least one means for performing the method of one or more of aspects 22-29.

Aspect 38: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method as one or more of aspects 22-29.

Aspect 39: a non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method as in one or more of aspects 22-29.

Aspect 40: a method of performing wireless communications by a User Equipment (UE), comprising: a power saving indication related to side link communication is transmitted to another UE.

Aspect 41: the method of aspect 40, wherein the power saving indication is transmitted during an active time or on duration of a sidelink discontinuous reception operation.

Aspect 42: the method of any of aspects 40-41, wherein the power saving indication is transmitted in side link control information.

Aspect 43: the method of any of aspects 40-42, wherein the power saving indication is a sequence-based indication.

Aspect 44: the method of any of aspects 40-43, wherein the power saving indication is indicated in a communication of a physical side link control channel or a physical side link shared channel.

Aspect 45: the method of any of aspects 40-44, wherein the power saving indication identifies at least one of a source identifier or a destination identifier associated with the power saving indication.

Aspect 46: the method of any of aspects 40-45, wherein the power saving indication indicates that the other UE is to go to sleep.

Aspect 47: the method of any of aspects 40-46, wherein the power saving indication indicates a duration for which the other UE is to sleep.

Aspect 48: the method of aspect 47, wherein the duration is a remaining portion of an active time of the sidelink discontinuous reception operation.

Aspect 49: the method of aspect 47, wherein the duration is a number of time intervals of active time of the sidelink discontinuous reception operation.

Aspect 50: the method of aspect 47, wherein the duration is a plurality of active times of a sidelink discontinuous reception operation.

Aspect 51: the method of any of aspects 40-50, wherein the power saving indication further indicates whether the other UE is to monitor wake-up signal occasions during a sleep duration of the other UE.

Aspect 52: the method of any of aspects 40-45, wherein the power saving indication indicates that the sidelink transmission will occur in a portion of a bandwidth of the sidelink resource pool.

Aspect 53: an apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in one or more of aspects 40-52.

Aspect 54: an apparatus for wireless communication comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more of aspects 40-52.

Aspect 55: an apparatus for wireless communication, comprising at least one means for performing a method as one or more of aspects 40-52.

Aspect 56: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method as one or more of aspects 40-52.

Aspect 57: a non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method as in one or more of aspects 40-52.

The foregoing disclosure provides insight and description, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the various aspects.

As used herein, the term "component" is intended to be broadly interpreted as hardware and/or a combination of hardware and software. "software" should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and/or functions, etc., whether described in software, firmware, middleware, microcode, hardware description language, or other terminology. As used herein, a processor is implemented in hardware, and/or a combination of 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 combinations of hardware and software. The actual specialized control hardware or software code used to implement the systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to the specific software code-it being understood that software and hardware can be designed to implement the systems and/or methods based at least in part on the description herein.

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

Although specific combinations of features are recited in the claims and/or disclosed in the specification, such combinations are not intended to limit the disclosure of the various aspects. Indeed, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each of the dependent claims listed below may depend directly on only one claim, disclosure of various aspects includes each dependent claim in combination with each other claim of the set of claims. As used herein, a phrase referring to a list of items "at least one of" refers to any combination of these items, including individual members. As an example, "at least one of a, b, or c" is intended to encompass: a. b, c, a-b, a-c, b-c, and a-b-c, as well as any combination having multiple identical elements (e.g., a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c).

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Moreover, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". Furthermore, as used herein, the article "the" is intended to include one or more items referenced in conjunction with the article "the" and may be used interchangeably with "one or more". Furthermore, as used herein, the terms "set (collection)" and "group" are intended to include one or more items (e.g., related items, non-related items, or a combination of related and non-related items), and may be used interchangeably with "one or more. Where only one item is intended, the phrase "only one" or similar language is used. Also, as used herein, the terms "having," "containing," "including," and the like are intended to be open ended terms. Furthermore, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise. Also, as used herein, the term "or" when used in a sequence is intended to be inclusive and may be used interchangeably with "and/or" unless otherwise specifically stated (e.g., where used in conjunction with "any one of" or "only one of").

Claims

1. A User Equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the one or more processors configured to:

receiving a power saving indication from another UE related to side link communication, the power saving indication indicating that the UE is to go to sleep or that side link transmission is to occur in a portion of the bandwidth of a side link resource pool; and

a power saving operation is performed based at least in part on the power saving indication.

2. The UE of claim 1, wherein the power saving indication is received during an active time or an on duration of a side chain discontinuous reception operation.

3. The UE of claim 1, wherein the power saving operation is performed based at least in part on transmitting acknowledgement feedback for the power saving indication.

4. The UE of claim 1, wherein the power saving indication is a sequence-based indication.

5. The UE of claim 1, wherein the power saving indication is indicated in a communication of a physical side link control channel or a physical side link shared channel.

6. The UE of claim 1, wherein the power saving indication identifies at least one of a source identifier or a destination identifier associated with the power saving indication.

7. The UE of claim 1, wherein the power saving operation is to go to sleep.

8. The UE of claim 1, wherein the power saving indication indicates that the UE is not to receive data from the other UE.

9. The UE of claim 1, wherein the power saving indication indicates a duration for which the UE is to sleep.

10. The UE of claim 9, wherein the duration is a remaining portion of an active time of a sidelink discontinuous reception operation, a number of time intervals of an active time of a sidelink discontinuous reception operation, or a plurality of active times of a sidelink discontinuous reception operation.

11. The UE of claim 1, wherein the UE indicates a duration of sleep by a semi-static configuration or a fixed rule based at least in part on receiving the power saving indication, and

wherein the semi-static configuration or the fixed rule is for a particular side link resource pool.

12. The UE of claim 1, wherein the UE is to sleep until a next wakeup signal occasion for a side link discontinuous reception operation based at least in part on receiving the power saving indication.

13. The UE of claim 1, wherein the one or more processors to perform the power saving operation are configured to: monitoring wake-up signal occasions during a sleep duration of the UE is suppressed.

14. The UE of claim 1, wherein the one or more processors to perform the power saving operation are configured to: wake-up signal opportunities are monitored during a sleep duration of the UE.

15. The UE of claim 1, wherein the power saving indication further indicates whether the UE is to monitor wake-up signal occasions during a sleep duration of the UE.

16. The UE of claim 1, wherein the one or more processors to perform the power saving operation are configured to: a physical side link control channel or a physical side link shared channel is monitored only in the portion of the bandwidth of the side link resource pool.

17. A network entity for wireless communication, comprising:

a memory; and

receiving, from a first User Equipment (UE), an indication that the first UE is not to transmit data to a second UE; and

transmitting, to the second UE, a power saving indication related to side link communication based at least in part on the indication, the power saving indication indicating that the second UE is to go to sleep.

18. The network entity of claim 17, wherein the indication is a buffer status report.

19. The network entity of claim 18, wherein the one or more processors are further configured to:

the method further includes determining, based at least in part on the buffer status report, that the first UE does not have data for transmission to the second UE.

20. The network entity of claim 17, wherein the indication indicates that the first UE does not have data for transmission to the second UE.

21. The network entity of claim 17, wherein the power saving indication is transmitted during an active time or an on duration of a side chain discontinuous reception operation of the second UE.

22. The network entity of claim 17, wherein the power saving indication is transmitted in a physical downlink control channel.

23. The network entity of claim 17, wherein the power saving indication indicates that the second UE is not to receive data from the first UE.

24. The network entity of claim 17, wherein the one or more processors are further configured to:

information identifying a side link destination identifier associated with the second UE and an access link identity associated with the second UE is received from the first UE, the information being obtained by the first UE during exchange of side link identity information between the first UE and the second UE.

25. A method of performing wireless communications by a User Equipment (UE), comprising:

26. The method of claim 25, wherein the power saving indication is received during an active time or an on duration of a side link discontinuous reception operation.

27. The method of claim 25, wherein the power saving operation is to go to sleep.

28. The method of claim 25, wherein performing the power saving operation comprises: a physical side link control channel or a physical side link shared channel is monitored only in the portion of the bandwidth of the side link resource pool.

29. A method of wireless communication performed by a network entity, comprising:

30. The method of claim 29, wherein the power saving indication is transmitted during an active time or an on duration of a side chain discontinuous reception operation of the second UE.