Energy saving techniques for sidelink communications

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may identify a set of one or more sidelink resources, and the UE may identify a wake-up signal occasion associated with the resource. The UE may monitor a wake-up signal during a wake-up signal occasion, and the UE may also monitor a set of associated one or more resources based on receiving the wake-up signal. In some examples, a respective set of one or more sidelink resources may be associated with a number of multiple-input multiple-output layers for sidelink communications, or may indicate a respective bandwidth portion for monitoring sidelink transmissions.

Description

[0001] This application is a divisional application of the invention whose applicant is Qualcomm Incorporated, whose application date is August 19, 2020, whose application number is 202080058634.6, and whose name is “Energy-saving technology for side-link communication”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This patent application claims priority to U.S. Patent Application No. 16 / 996,601, filed on August 18, 2020 by Hosseini et al., entitled “POWER SAVING TECHNIQUES FOR SIDELINK COMMUNICATION,” and U.S. Provisional Patent Application No. 62 / 888,951, filed on August 19, 2019 by Hosseini et al., entitled “POWER SAVING TECHNIQUES FOR SIDELINK COMMUNICATION,” each of which is assigned to its assignee. Background Art

[0004] The following relates to wireless communications, and more particularly to techniques that enable power conservation at a device.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports communication for multiple communication devices, which may be further referred to as user equipment (UE). Summary of the invention

[0006] A method for wireless communication at a first UE is described. The method may include identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, and sending a wake-up signal (WUS) to the second UE on the sidelink communication link. In some examples, the WUS may be sent during a WUS opportunity associated with the set of one or more resources. The method may also include sending a message to the second UE using the set of one or more resources based on the WUS.

[0007] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to identify (e.g., at a first UE) a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, and to send a WUS to the second UE on the sidelink communication link. In some examples, the WUS may be sent during a WUS opportunity associated with the set of one or more resources. The processor and the memory may be configured to send a message to the second UE using the set of one or more resources based on the WUS.

[0008] Another apparatus for wireless communication is described. The apparatus may include components for identifying (e.g., at a first UE) a set of one or more resources for sidelink communication with a second UE on a sidelink communication link and sending a WUS to the second UE on the sidelink communication link. In some examples, the WUS may be sent during a WUS opportunity associated with the set of one or more resources. In some examples, the apparatus may be configured to send a message to the second UE using the set of one or more resources based on the WUS.

[0009] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to identify a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, and to send a WUS to the second UE on the sidelink communication link. In some examples, the WUS may be sent during a WUS opportunity associated with the set of one or more resources. The code may include instructions executable by a processor to send a message to the second UE using the set of one or more resources based on the WUS.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a set of one or more resources may include operations, features, components, or instructions for receiving a resource grant from a base station indicating a set of one or more resources for sidelink communication, wherein a WUS associated with the set of one or more resources may be sent based on the resource grant.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a set of one or more resources may be associated with a number of multiple-input multiple-output (MIMO) layers.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a set of one or more resources may include operations, features, components, or instructions for selecting a set of one or more resources from multiple sets of resources for sidelink communication, each of the multiple sets of resources being associated with a corresponding WUS opportunity, wherein a WUS associated with the set of one or more resources may be sent based on the selected set of one or more resources.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for determining a number of MIMO layers for communicating with a second UE on a sidelink communication link, wherein a set of one or more resources may be selected based on the determined number of MIMO layers.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for identifying one or more time slot groups for sending a message and sending a message during at least one of the one or more time slot groups, wherein the WUS indicates the one or more time slot groups to the second UE.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, one or more time slot groups may be indicated to the second UE via a bitmap or sequence.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for sending a WUS in a first bandwidth part (BWP) of the sidelink communication link, wherein sending the message includes sending the message in a second BWP different from the first BWP.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second BWP can be from a set of bandwidth parts (BWPs) associated with the sidelink communication.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending a message may include operations, features, components, or instructions for sending a message during one or more sidelink control channel periods, each sidelink control channel period including a physical sidelink control channel and a physical sidelink shared channel.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each sidelink control channel period can have a duration of one time slot.

[0020] A method of wireless communication at a first UE is described. The method may include identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, and receiving a WUS from the second UE on the sidelink communication link. In some examples, the WUS may be received based on monitoring a WUS opportunity associated with the set of one or more resources. The method may further include monitoring the identified set of one or more resources for transmission from the second UE based on the received WUS.

[0021] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to identify (e.g., at a first UE) a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, and to receive a WUS from the second UE on the sidelink communication link. In some examples, the WUS may be received based on monitoring a WUS opportunity associated with the set of one or more resources. The processor and the memory may be configured to monitor the identified set of one or more resources for transmission from the second UE based on the received WUS.

[0022] Another apparatus for wireless communication at a first UE is described. The apparatus may include components for identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link and receiving a WUS from the second UE on the sidelink communication link. In some examples, the WUS may be received based on monitoring a WUS opportunity associated with the set of one or more resources. The apparatus may also include components for monitoring the identified set of one or more resources for transmission from the second UE based on the received WUS.

[0023] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to identify a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, and receive a WUS from the second UE on the sidelink communication link. In some examples, the WUS may be received based on monitoring a WUS opportunity associated with the set of one or more resources. The instructions executable by the processor monitor the identified set of one or more resources for transmission from the second UE based on the received WUS.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a set of one or more resources may include operations, features, components, or instructions for identifying the set of one or more resources based on a received WUS.

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for identifying a bitmap indicating a set of one or more resources based on the WUS.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for identifying one or more time slot groups based on an indication associated with a received WUS, wherein monitoring of the identified set of one or more resources for transmissions from a second UE may be performed during each of the one or more time slot groups.

[0027] Some examples of methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for avoiding monitoring one or more groups of time periods based on the indication, the one or more groups of time periods comprising symbol periods, or time slots, or a combination thereof.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication includes a bitmap associated with the WUS.

[0029] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, the set of one or more resources may be from a plurality of sets of resources for sidelink communication, each of the plurality of sets of resources being associated with a respective WUS opportunity.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each set of a plurality of sets of resources may be associated with a corresponding number of MIMO layers.

[0031] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for monitoring a WUS in a first BWP of a sidelink communication link, wherein monitoring the set of one or more resources for transmission includes monitoring a second BWP different from the first BWP.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second BWP may be from a set of BWPs associated with the sidelink communication.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, monitoring a set of one or more resources for transmission may include operations, features, components, or instructions for monitoring a set of one or more resources during one or more sidelink control channel periods, each sidelink control channel period including a physical sidelink control channel and a physical sidelink shared channel.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each sidelink control channel period can have a duration of one time slot.

[0035] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the physical side link control channel and the physical side link shared channel may be non-overlapping in time, or non-overlapping in frequency, or overlapping in time, or overlapping in frequency, or any combination thereof.

[0036] A method of wireless communication at a base station is described. The method may include identifying a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities. The method may also include sending a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link.

[0037] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to identify (e.g., at a base station) a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities. The processor and the memory may also be configured to send a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link.

[0038] Another apparatus for wireless communication at a base station is described. The apparatus may include means for identifying a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities. The apparatus may include means for sending a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link.

[0039] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to identify a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities. In some examples, the instructions may be executable by the processor to send a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a set of one or more resources may include operations, features, components, or instructions for selecting a set of one or more resources from multiple sets of resources for sidelink communication, each of the multiple sets of resources being associated with a corresponding WUS opportunity.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying a set of one or more resources can include operations, features, components, or instructions for determining a number of MIMO layers for sidelink communication, wherein the set of one or more resources can be selected based on the determined number of MIMO layers.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a set of one or more resources includes one or more sidelink control channel periods, each sidelink control channel period including a physical sidelink control channel and a physical sidelink shared channel.

[0043] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each sidelink control channel period can have a duration of one time slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 An example of a wireless communication system supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0045] Figure 2A , Figure 2B and Figure 2C An example of a wireless communication system supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0046] Figure 3A and Figure 3B An example of a wireless communication system supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0047] Figure 4An example of a resource allocation timeline supporting power saving techniques for sidelink communications in accordance with one or more aspects of the present disclosure is shown.

[0048] Figure 5A and Figure 5B Examples of control and data channel configurations supporting power saving techniques for sidelink communications in accordance with one or more aspects of the present disclosure are shown.

[0049] Figure 6 An example of a resource pool supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0050] Fig. 7A and Figure 7B An example of a wireless communication system supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0051] Figure 8 and Fig. 9 A block diagram of a device supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0052] Fig.10 A block diagram of a UE communication manager supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0053] Fig.11 A schematic diagram of a system including a device supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0054] Fig.12 and Fig.13 A block diagram of a device supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0055] Fig.14 A block diagram of a base station communication manager supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0056] Fig.15 A schematic diagram of a system including a device supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown.

[0057] Figures 16 to 19 A flow chart of a method for supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0058] A wireless communication system may support both access links and side links for communication between wireless devices. An access link may refer to a communication link between a user equipment (UE) and a base station. For example, an access link may support uplink signaling, downlink signaling, connection establishment and synchronization processes, etc. A side link may refer to a communication link between similar wireless devices (e.g., a communication link between UEs or a backhaul communication link between base stations). It should be noted that although the various examples provided herein are discussed for UE side link devices, such side link technologies may be used for any type of wireless device using side link communication. For example, a side link may support device-to-device (D2D) communication, vehicle-to-everything (V2X) and / or vehicle-to-vehicle (V2V) communication, message relay, discovery signaling, beacon signaling, or any combination of these or other signals sent from one UE to one or more other UEs over the air.

[0059] In various coverage states within a cell, a UE may utilize sidelink communications. For example, sidelink communications may include communications between two UEs within a coverage area provided by a base station, communications between one UE within the coverage area and another UE outside the coverage area (e.g., a UE outside the coverage area), or communications between two UEs both outside the coverage area. As shown in these examples, there may be situations where a UE can communicate on a sidelink and outside the coverage area of ​​a base station, and the UE may therefore lack a direct connection to the network (e.g., via a radio resource control (RRC) link). As a result, a UE outside the coverage area may irregularly monitor paging signals from the network, and may also be unaware of one or more other UEs that may send information to the UE outside the coverage area via a sidelink communication link. A UE outside the coverage area may therefore monitor a sidelink resource pool for sidelink transmissions from other UEs. Similarly, a UE within the coverage area may also be unaware of when a sidelink transmission may be issued, and a UE within the coverage area may accordingly monitor a sidelink resource pool for transmissions from another UE. In some cases, such monitoring of sidelink transmissions by the UE may be continuous to ensure that sidelink transmissions are not missed and the UE may consume excessive power as a result.

[0060] However, as described herein, energy-saving techniques for sidelink communications may be used to enable reduced energy consumption and extended battery life. For example, energy-saving techniques may be implemented for UEs by using a wake-up signal (WUS) for sidelink communications. In this case, a set of resources (e.g., a resource pool) may be selected for communication between UEs on the sidelink, wherein the corresponding resource pools may be associated with different WUS opportunities. For example, a first set of one or more sidelink resource pools (e.g., including uplink and downlink resource pools) may be associated with a first WUS opportunity (e.g., with a certain offset from the start of one or more physical sidelink control channels (PSCCH) periods), and a second set of one or more sidelink resource pools may be associated with a second WUS opportunity (e.g., with a different offset from the start of one or more PSCCH periods). In this case, the WUS opportunity may be indicated by the sidelink resource pool used, or alternatively, the WUS may indicate (e.g., via a bitmap or WUS sequence) which sidelink resource pools may be used for sidelink communications. In either case, the UE may monitor the sidelink resources for transmission from another UE on the sidelink based on receiving the associated WUS. In some examples, the WUS may be UE-specific (eg, the WUS may be designated to wake up a specific UE, or the WUS may be directed to wake up a specific group of UEs).

[0061] In addition, different resource pool sets can be associated with corresponding MIMO layer numbers. Therefore, side link resources can be selected based on the number of MIMO layers suitable for side link transmission, thereby providing further granularity for the UE to save power by using dynamically selected resources and associated MIMO layers for side link communication. Like this, the corresponding WUS can be used to modify the number of MIMO layers by indicating which resource pools can be monitored by the UE. Additionally or alternatively, different side link BWPs can be activated by the use of a side link WUS, wherein a WUS can be sent on a first BWP, which activates a different, second BWP (e.g., a larger BWP, one or more other BWPs designated for a side link, etc.). In some examples, the side link WUS can be separate or can be dependent on a WUS for a direct link or a Uu link. In this case where the WUS is independent of the Uu link, the side link WUS can change or modify the parameters of the side link communication, and different Uu WUS can change or modify the parameters of the Uu communication. In some other cases, if the sidelink WUS and Uu WUS are dependent on each other, a command for one may modify parameters of the other (e.g., a command associated with the sidelink WUS may modify parameters of the Uu WUS, or a command for the Uu WUS may modify parameters of the sidelink WUS). Through one or any combination of the described techniques, the UE may implement various schemes for energy saving enhancements, thereby improving battery life and reducing unnecessary energy consumption at the UE when communicating on the sidelink.

[0062] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Further examples of WUSs associated with resource pools are then described with reference to the wireless communication system. Various aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow charts related to energy-saving techniques for sidelink communications.

[0063] Figure 1 An example of a wireless communication system 100 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The wireless communication system 100 may include a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0064] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may be devices of different forms or capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 support signal communications according to one or more radio access technologies.

[0065] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, or moving, or both at different times. UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, and / or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 as shown in .

[0066] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 via a backhaul link 120 (e.g., via S1, N2, N3 or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) or both via the backhaul link 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links. One or more base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a node B, an eNodeB (eNB), a next generation node B or a gigabit node B (any of which may be referred to as a gNB), a home node B, a home eNodeB or other suitable terms. In some examples, the UE 115 may communicate with the core network 130 via a communication link 135.

[0067] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, a machine type communication (MTC) device, etc., which may be implemented in various objects (such as appliances, vehicles, meters, etc.).

[0068] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays, and base stations 105 and including macro eNBs or gNBs, small cell eNBs or gNBs, UEs 115 and base stations 105 may communicate wirelessly with each other on one or more carriers via one or more communication links 125. The term "carrier" may refer to a collection of radio spectrum resources having a defined physical layer structure for supporting a communication link 125. For example, a carrier for a communication link 125 may include a portion of a radio spectrum band (e.g., BWP) that operates according to a physical layer channel for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling to coordinate carrier operations, user data, or other signaling. The wireless communication system 100 may use carrier aggregation or multi-carrier operation to support communications with the UE 115. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0069] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster for discovery by a UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by a UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., a different carrier of the same or different radio access technology) is used to establish a connection.

[0070] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0071] A carrier may be associated with a particular bandwidth of a radio spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., base stations 105, UEs 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth or may be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include base stations 105 and / or UEs 115 that support simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each serviced UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0072] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity of communications with UE 115.

[0073] One or more parameter sets for a carrier may be supported, where the parameter set may include subcarrier spacing ( ) and cyclic prefix. A carrier may be divided into BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some cases, a single BWP for a carrier is active at a given time, and communications by a UE 115 may be limited to the active BWP.

[0074] The time interval of the base station 105 or the UE 115 may be expressed as a multiple of a basic time unit, for example, it may refer to The sampling period is seconds, where can represent the maximum supported subcarrier spacing, and The maximum supported Discrete Fourier Transform (DFT) size may be indicated. Time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0075] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some cases, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0076] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some cases, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0077] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, a UE 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information of a control information format having a given payload size. A search space set may include a common search space set configured for sending control information to multiple UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0078] Each base station 105 may provide communication coverage via one or more cells, such as macro cells, small cells, hot spots, or other types of cells, or various combinations thereof. The term "cell" may refer to a logical communication entity used to communicate with the base station 105 (e.g., on a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area, depending on various factors such as the capabilities of the base station 105. For example, a cell may be or include a building, a subset of a building, an external space between or overlapping a geographic coverage area 110, and the like.

[0079] A macro cell covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE 115 with a service subscription to a network provider that supports the macro cell. A small cell may be associated with a lower power base station 105 than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a home or office, etc.). A base station 105 may support one or more cells, and may also support communications using one or more component carriers on one or more cells. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB) or other) that may provide access to different types of devices.

[0080] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0081] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and in some examples, transmissions from different base stations 105 may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0082] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application that utilizes the information or presents it to a person interacting with the application. Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart meters, inventory monitoring, water level monitoring, instrument monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0083] Some UEs 115 may be configured to employ an operating mode that reduces energy consumption, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communications, operating on a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0084] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication, and may be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include service priorities, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0085] In some cases, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105. In some cases, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without the participation of the base station 105.

[0086] In some systems, a D2D communication link (e.g., sidelink communication link 135) may be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some cases, vehicles in a V2X system may communicate with roadside infrastructure (such as a roadside unit), or communicate with a network using vehicle-to-network (V2N) communication via one or more network nodes (e.g., base station 105), or communicate with both.

[0087] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0088] Some of the network devices (such as base stations 105) may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through several other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity may include one or more antenna panels. In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs), or merged into a single network device (e.g., base station 105).

[0089] The wireless communication system 100 may operate using, for example, one or more frequency bands in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). The region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the lengths of the wavelengths range from approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission of smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0090] The electromagnetic spectrum is often subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified with the frequency range names FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6GHz). The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as the "Sub 6 GHz" band in various documents and articles. A similar naming issue sometimes arises with respect to FR2, which is often referred to (interchangeably) as the "millimeter wave" band in documents and articles, although this is different from the extremely high frequency (EHF) band (30 GHz-300 GHz) which is identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0091] In view of the above aspects, unless otherwise explicitly stated, it should be understood that the term "Sub 6 GHz" and the like (if used herein) can broadly represent frequencies that may be less than 6 GHz, frequencies that may be within FR1, or frequencies that may include mid-band frequencies. In addition, unless otherwise explicitly stated, it should be understood that the term "millimeter wave" and the like (if used herein) can broadly represent frequencies that may include mid-band frequencies, frequencies that may be within FR2, or frequencies that may be within the EHF band.

[0092] The wireless communication system 100 may also operate in a super high frequency (SHF) region (also known as a centimeter band) using a frequency band from 3 GHz to 30 GHz, or in an extremely high frequency (EHF) region (also known as a millimeter band) of the spectrum (e.g., from 30 GHz to 300 GHz). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be smaller and closer together than the UHF antennas. In some cases, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer from greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be employed in transmissions using one or more different frequency regions, and the bands specified for use in these frequency regions may vary by country or regulatory agency.

[0093] The wireless communication system 100 can utilize both licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), unlicensed LTE (LTE-U) radio access technology, or NR technology in an unlicensed band (such as a 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio spectrum band, devices such as base stations 105 and UEs 115 can employ carrier sensing for conflict detection and avoidance. In some cases, operations in an unlicensed band can be based on a carrier aggregation configuration in combination with component carriers operating in a licensed band (e.g., LAA). Operations in an unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, D2D transmissions, and the like.

[0094] The base station 105 or UE 115 may be equipped with multiple antennas that may be used to employ techniques such as transmit diversity, receive diversity, MIMO communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some cases, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0095] The base station 105 or UE 115 may use MIMO communications to exploit multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. For example, multiple signals may be sent by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technologies include single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0096] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation with respect to the antenna array experience constructive interference and other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0097] The base station 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communications with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals based on different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as the base station 105 or a receiving device such as the UE 115) the beam direction for subsequent transmission and / or reception by the base station 105.

[0098] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in different beam directions. For example, UE 115 may receive one or more of the signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 having the highest signal quality or at another acceptable signal quality.

[0099] In some cases, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may send reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel codebook, linear combination codebook, port selection codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques for sending signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or for sending signals in a single direction (e.g., for sending data to a receiving device).

[0100] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, a receiving device may try multiple reception directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (e.g., different sets of directional listening weights), or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different reception configurations or reception directions. In some examples, a receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., based on a beam direction having the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality determined based on listening according to multiple beam directions).

[0101] The wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The medium access control (MAC) layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels.

[0102] UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received on communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). Under poor radio conditions (e.g., low signal-to-noise ratio conditions), HARQ may improve throughput at the MAC layer. In some cases, a device may support HARQ feedback for the same time slot, wherein the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time intervals.

[0103] In some cases, the UE 115 may continuously monitor the communication link 125 (e.g., a wireless link) to obtain an indication that the UE 115 can receive data. In other cases (e.g., to save power and extend battery life), the UE 115 may be configured with a discontinuous reception (DRX) cycle. The DRX cycle consists of an "On Duration" during which the UE 115 can monitor control information (e.g., on a physical downlink control channel (PDCCH)) and a "DRX period" during which the UE 115 can power off the radio components. In some cases, the UE 115 may be configured with a short DRX cycle and a long DRX cycle. In some cases, if the UE 115 is inactive in one or more short DRX cycles, it may enter a long DRX cycle. The transition between short DRX cycles, long DRX cycles, and continuous reception may be controlled by an internal timer or by a message from the base station 105. The UE 115 may receive a scheduling message on the PDCCH during the On Duration. While monitoring the PDCCH for a scheduling message, the UE 115 may start a "DRX inactivity timer". If the scheduling message is successfully received, the UE 115 may be ready to receive data and the DRX inactivity timer may be reset. When the DRX inactivity timer expires and no scheduling message is received, the UE 115 may move to a short DRX cycle and may start a "DRX short cycle timer". When the DRX short cycle timer expires, the UE 115 may resume a long DRX cycle.

[0104] The wireless communication system 100 may support various energy-saving techniques when communicating on the sidelink. As an example, the UE 115 may determine one or more sidelink DRX parameters for use when communicating with another UE 115 on the sidelink communication link. The sidelink DRX parameters may be indicated to the UE 115 by the base station 105 or another UE 115 (e.g., a UE 115 within coverage). In some examples, the UE 115 may select the sidelink DRX parameters from the sidelink DRX parameter set, and the UE 115 may indicate the selected parameters to another UE 115 (e.g., a UE 115 outside coverage). Based on the received sidelink DRX parameters, the UE 115 may not continuously monitor the transmission from the other UE 115 on the sidelink communication link. Like this, the UE 115 may avoid continuously monitoring the sidelink transmission according to the sidelink DRX parameters (e.g., on-duration, various sidelink DRX timers, and other DRX parameters), and thereby may save power and reduce battery consumption at the UE 115.

[0105] The wireless communication system 100 may support the use of a WUS for energy saving when communicating on a sidelink communication link 135. As an example, a UE 115 may identify a set of one or more resources (e.g., including uplink and downlink time / frequency resources) for sidelink communication. Additionally, the UE 115 may identify a WUS opportunity associated with a set of one or more resources. In some cases, a set of one or more resources may indicate a WUS opportunity to be used. Additionally or alternatively, the WUS may indicate which set of one or more resources may be used for sidelink communication. In either case, the UE 115 may receive the WUS and monitor the associated resources for transmissions from another UE 115 on the sidelink communication link 135. In some cases, the WUS may indicate some time periods (e.g., grouped symbols and / or time slots) during which sidelink transmissions may be issued. Thus, when monitoring sidelink resources for sidelink transmission, UE 115 can monitor the indicated time period, and in some examples, UE 115 can avoid monitoring time periods (e.g., other grouped time periods) when sidelink transmission is not expected, enabling further energy savings at UE 115.

[0106] In some cases, the set of one or more side link resources may also be associated with a MIMO layer number, where different side link resources may each be associated with a different MIMO layer number. In some cases, the base station 105 may schedule a set of one or more side link resources based on the MIMO layer number to be used for side link transmission, where the scheduling of resources corresponds to the MIMO layer number. Additionally or alternatively, the UE 115 may select resources associated with the appropriate MIMO layer number for side link communication. Like this, the corresponding WUS may be used to modify the MIMO layer number by indicating which resources may be monitored by the UE 115. In some cases, the BWP (e.g., the default BWP) including the WUS may be smaller than the size of the BWP for the set of one or more side link resources. Like this, the UE 115 may monitor the default BWP to obtain the WUS, and if the WUS is received, the WUS may activate another larger BWP for monitoring the side link transmission from another UE 115. Another BWP may also be a configured BWP (e.g., one or more side link BWPs may be configured), and the WUS may indicate which resources correspond to the active BWP accordingly. Thus, by using different BWPs associated with sets of sidelink resources, the BWP may be adjusted based on the traffic communicated over the sidelink communication link 135, thereby providing further energy savings at the UE 115 (eg, the UE 115 avoids monitoring a larger BWP than necessary).

[0107] One or more base stations 105 may include a base station communication manager 101 that may identify a set of one or more resources (e.g., a resource pool) for sidelink communication between a first UE 115 and a second UE 115 on a sidelink communication link 135, wherein the set of one or more resources is associated with one or more WUS opportunities, and send a resource grant to the first UE 115 to schedule the set of one or more resources on the sidelink communication link 135. The base station communication manager 101 may be an example of aspects of a base station communication manager 1510 described herein.

[0108] The UE 115 may include a UE communication manager 102-a that may identify a set of one or more resources (e.g., a pool of resources) for sidelink communication with a second UE 115 and a second UE communication manager 102-b on a sidelink communication link 135, send a WUS to the second UE 115 on the sidelink communication link 135, send the WUS during a WUS opportunity associated with the set of one or more resources, and based on the WUS, send a message to the second UE 115 using the set of one or more resources. The UE communication manager 102-a may also identify a set of one or more resources for sidelink communication with the second UE 115 and the second UE communication manager 102-b on the sidelink communication link 135, receive the WUS from the second UE on the sidelink communication link 135, receive the WUS based on monitoring a WUS opportunity associated with the set of one or more resources, and monitor the identified set of one or more resources for transmissions from the second UE 115 based on the received WUS. UE communications managers 102 - a and 102 - b may be examples of aspects of a UE communications manager 1110 described herein.

[0109] Figure 2A , Figure 2B and Figure 2C An example of wireless communication systems 200-a, 200-b, and 200-c that support energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. In some examples, the wireless communication systems 200-a, 200-b, and 200-c can implement aspects of the wireless communication system 100. For example, the wireless communication systems 200-a, 200-b, and 200-c each include a base station 105 (e.g., base station 105-a, base station 105-b, and base station 105-c) and one or more UEs 115 (e.g., UE 115-a to UE 115-f), which can be referenced Figure 1 Examples of corresponding devices described. Wireless communication systems 200-a, 200-b, and 200-c may illustrate various coverage levels for UEs 115 communicating using sidelink communications.

[0110] In some cases, a UE 115-a may communicate directly with another UE 115-b (or with another group of UEs 115) over a sidelink connection (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). Such communications may be referred to as D2D or sidelink communications, where a first UE 115 may be scheduled (e.g., by a base station 105 or another UE 115) to send data or control information to a second UE 115 over a sidelink. In some cases, a sidelink may be a communication link or signal sent between different UEs 115 in a network, where one UE 115 may act as a relay for information sent by another device.

[0111] In an example of a wireless communication system 200-a, one or more of a group of UEs 115 (e.g., UE 115-a and UE 115-b) may support sidelink communications within a coverage area 110 of a base station 105-a in addition to direct communications with the base station 105-a. In this case, UEs 115-a and 115-b may be within coverage. For example, UE 115-a may communicate with base station 105-a via communication link 225-a while maintaining sidelink communications with UE 115-b on sidelink 230-a. In addition, UE 115-b may communicate with the base station on communication link 225-b while also communicating with UE 115-a using sidelink 230-a. In some cases within coverage, each UE 115 may be connected to base station 105 via a direct link (e.g., via a Uu interface).

[0112] In the example of wireless communication system 200-b, one or more of a group of UEs 115 (eg, UEs 115-c and 115-d) may support sidelink communication technology. Figure 2B In the example of , UE 115-c may be within the coverage area 110 of base station 105-b, and UE 115-c may communicate directly with base station 105-b using communication link 225-c. Additionally, UE 115-d may be outside of coverage area 110 and may not communicate using a direct link with base station 105-b (e.g., UE 115-d may not have an established Uu or RRC connection with base station 105-b). In other cases, UE 115-d may be within coverage area 110 but may not be able to communicate directly with base station 105-b (e.g., UE 115-d may experience interference, reduced signal strength, or otherwise obstructed communication). In this case, UE 115-d may communicate with UE 115-c using side link 230-b.

[0113] exist Figure 2BIn an example of , the group of UEs 115 may be in partial coverage (e.g., at least one of the UEs may be in direct communication with the base station, and at least one other UE may be out of coverage). In such a partial coverage situation, a UE 115 in direct communication with the base station (e.g., UE 115-c) may act as a relay for information sent from base station 105-b. For example, UE 115-c may receive data or control information directly from base station 105-b via communication link 225-c and may relay the information to UE 115-d via side link 230-b. In this case, UE 115-c may assist in communications between base station 105-b and UE 115-d that is out of coverage.

[0114] In an example of a wireless communication system 200-c, one or more of a group of UEs 115 (e.g., UEs 115-e and 115-f) may communicate outside of a coverage area 110 of a base station 105-b using a sidelink. In some examples, UEs 115-e and UEs 115-f may not have a direct connection to the base station 105-c because both UEs 115 are outside of the geographic coverage area 110 of the base station 105-c. In some other examples, the UEs 115 may be inside the geographic coverage area 110, but may not be able to communicate directly with the base station 105-c (e.g., due to interference, reduced signal strength, etc.). In this case, the UEs 115 may be out of coverage and may not have a Uu or other direct connection established with the base station 105-c.

[0115] UE 115-e may be able to communicate directly with another UE 115-f (or with another group of UEs 115) on a side link 230-c. In such communications, UE 115 may communicate without a direct connection to base station 105-c. However, as shown in wireless communication systems 200-a, 200-b, and 200-c, there may be a situation where UE 115 is outside the coverage of base station 105 and may lack a direct (e.g., RRC) connection with the network when communicating with another UE 115 via one or more side links 230. Such out-of-coverage UEs 115 may not regularly monitor paging signals from the network, and some UEs 115 may not yet be aware of other UEs 115 that may be transmitting via side links 230. UEs 115 out of coverage and UEs 115 within coverage may monitor side link resources (e.g., resource pools) for transmissions from other UEs 115. Such monitoring may be continuous, and as a result, out-of-coverage UEs 115 may consume power unnecessarily.

[0116] As described herein, the technology can be used in wireless communication systems 200-a, 200-b, and 200-c to enable energy saving at a device communicating via a side link 230. As an example, a WUS for side link communication can be sent to UE115. In this case, different sets of side link resources can be associated with corresponding WUS opportunities. As a result, UE115 can identify which resources are to be monitored for side link transmission, and can also identify WUS opportunities corresponding to these resources. Like this, UE 115 can periodically wake up to monitor the side link WUS, and UE 115 can monitor the side link communication during the time period indicated by the received side link WUS. Further aspects of energy saving include the association of different MIMO layers with corresponding sets of side link resources, and using a smaller BWP when monitoring the WUS and activating a larger BWP when the received WUS indicates that the side link communication is to be monitored. Therefore, the described technology can provide various degrees of energy saving for UE 115 communicating via side link 230.

[0117] Figure 3A and Figure 3B An example of wireless communication systems 300-a and 300-b supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. In some examples, the wireless communication systems 300-a and 300-b can implement aspects of the wireless communication systems 100 and 200. For example, the wireless communication systems 300-a and 300-b each include a base station 105-e and one or more UEs 115 (e.g., UE 115-i and UE 115-j), which can be referenced Figure 1 2 and 3. Wireless communication systems 300-a and 300-b may illustrate signaling of a WUS for power saving when using sidelink communications.

[0118] In some cases, the network may use WUS in the techniques used at the device to further increase energy conservation. The network may implement WUS techniques for enhancing DRX communications that may be used by UE 115-i and 115-j. UE 115-i and 115-j may be configured to monitor control channels (e.g., PDCCH, PSCCH, etc.) according to the configured on-duration of the DRX cycle. For example, UE 115-i and 115-j may wake up from idle mode during each on-duration of the DRX cycle to monitor transmissions on the PDCCH or PSCCH, and UE 115-i and 115-j may return to idle or low energy consumption mode during each off-duration of the DRX cycle. In some examples, a WUS issued by UE 115-i to UE 115-j on the sidelink may be triggered by UE 115-i itself (e.g., when UE 115-i has data to send to UE 115-j, UE 115-i may trigger the transmission of a WUS). In some other examples, transmission of the WUS may be triggered by the network (eg, by the base station 105 - e directly to the target UE or by the base station 105 - e through a relay device to the target UE).

[0119] In order to enhance energy saving at UE 115-i and 115-j, several WUS opportunities may be configured in addition to the DRX configuration. In some cases, each WUS opportunity may be a low-power signal that may be sent before each associated ON opportunity of a DRX cycle. In some examples, the WUS may indicate to the UE 115 which ON opportunities it may skip (e.g., at which ON opportunities of the DRX cycle the UE 115 may remain in a low-power state). Additionally or alternatively, the WUS may indicate to the UE 115 that it may expect to receive data in a subsequent ON duration, so that the UE 115 may wake up from a low-power mode. In some examples, the WUS may indicate to the UE 115 (e.g., independent of the DRX cycle) that the UE 115 will wake up and remain awake indefinitely, or that the UE 115 will wake up and remain awake for a specified period of time (e.g., a period of time specified by the WUS).

[0120] In some cases, such as in wireless communication system 300-a, base station 105-e may receive an indication that UE 115-i may communicate with an out-of-coverage UE (e.g., UE 115-j) via sidelink communication. In this case, base station 105-e may send a sidelink grant 305 to UE 115-i. Sidelink grant 305 may include information that UE 115-i may use to communicate with UE 115-j, for example, sidelink grant 305 may indicate a number of sidelink resources that UE 115-i may use to communicate with UE 115-j. In addition, sidelink grant 305 may include a sidelink DRX configuration that UE 115-i may send to 115-j via the indicated sidelink resources. In some examples, the sidelink DRX configuration sent to UE 115-i may include an indication of a WUS opportunity associated with the indicated sidelink DRX configuration.

[0121] In some cases, after communicating with base station 105-e, UE 115-i may use base station 105-e to communicate with base station 105-e in reference to Figure 3A 305 to establish a sidelink with UE 115-j. UE 115-i may relay information that it may receive from base station 105-e to UE 115-j, which may include sidelink DRX configuration information 310 and an associated WUS configuration. In some other cases, UE 115-i may select the sidelink resources and the sidelink DRX configuration without direct communication with base station 105-e.

[0122] In some cases, the information 310 sent from UE 115-i to UE 115-j may include a DRX configuration for UE 115-j. The DRX cycle may indicate a time period in which UE 115-j may monitor a control channel (e.g., PDCCH, PSCCH, etc.) according to an on-duration 320 of the configured DRX cycle. For example, UE 115-j may wake up from an idle mode during each on-duration 320 of the DRX cycle to monitor transmissions on the PDCCH or PSCCH, and UE 115-j may return to an idle or low power mode during each off-duration of the DRX configuration. The DRX cycle duration 325 may be the time it may take to complete the on-duration and off-duration of the DRX configuration.

[0123] Prior to the start of each on-duration 320 of the sidelink DRX configuration, within a given offset, there may be a WUS opportunity 315 to monitor the PSCCH WUS. The UE 115-j may wake up during each WUS opportunity 315a-c to monitor the PSCCH WUS, and if it receives a WUS, it may wake up in the associated on-duration. If the UE 115-j does not receive a PSCCH WUS during the WUS opportunity 315, it may remain in sleep mode during the next on-duration. In some cases, and as described in further detail below, a collection of various resources (e.g., a resource pool) may be associated with a WUS opportunity used by the UE 115-j to wake up and monitor PSCCH transmissions during a PSCCH period.

[0124] Figure 4 An example of a resource allocation timeline 400 supporting power saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. In some examples, resource allocation timeline 600 can implement aspects of wireless communication systems 100, 200, and 300.

[0125] In some cases, a single target UE 115 or a group of target UEs 115 can receive data from a source UE 115 via a side link connection. However, there may be different source UEs 115, which may attempt to connect to multiple target UEs. In this case (e.g., where the transmission is not unicast), WUS PDCCH may be implemented to manage or synchronize DRX. WUS PDCCH or PSCCH signaling may also be implemented in such a case to enable enhanced energy saving at UE 115. It should be noted that target UE 115 and source UE 115 may correspond to UE 115 outside the coverage and UE 115 within the coverage, and vice versa. In other cases, target UE 115 and source UE 115 may be both within the coverage or outside the coverage, or any combination thereof. In any case, WUS may be transmitted between different UEs 115 on the side link communication link, regardless of their coverage with base station 105.

[0126] In some examples, the WUS may be implemented before each PSCCH period, where the PSCCH period indicates a period in which the PSCCH and the physical sidelink shared channel (PSSCH) may be sent together on the sidelink between the UE 115. In some examples, the WUS may be mapped to several sidelink time slots. Before each set of sidelink time slots, there may be a monitoring opportunity for the WUS that the UE may monitor, and based on monitoring the monitoring opportunity for the WUS, the UE 115 may determine whether it must wake up during the associated sidelink time slot. In some cases, the WUS may be implemented before the start of each resource pool period (e.g., a period including a configured sidelink resource pool). As such, the PSCCH period may correspond to or otherwise be referred to as a resource pool period. In some cases, the PSCCH period may include several subframes, time slots, and / or symbol periods (e.g., OFDM symbol periods) allocated for the PSCCH, and several additional subframes are allocated to the PSSCH data pool. In some cases, the PSCCH period may be associated with multiple PSSCH data pools. In some other implementations, each slot may contain both control and data (eg, both PSCCH and PSSCH).

[0127] For sidelink communications, the WUS opportunity 415 and the offset period 420 may include a time period 410 before each PSCCH / PSSCH period. In some cases, the UE 115 may transmit the PSCCH and PSSCH together in a single time slot or during a single time period. The transmitting UE 115 may receive a sidelink grant 405 from the base station, and the transmitting UE 115 may wait for the next PSCCH period according to the minimum offset time. The transmitting UE 115 may send a WUS to the receiving UE 115 during the WUS opportunity 415. The receiving UE 115 may monitor the WUS opportunity 415, which may be placed before a certain offset period 420 (the offset period 420 may separate the WUS opportunity and the PSCCH period) at the beginning of the PSCCH period. The WUS may contain a UE ID or a group ID so that if the target UE 115 detects a WUS with a matching ID, it may monitor the next one or more PSCCH periods. If the target UE 115 does not receive a WUS during the WUS opportunity 415, or if the UE ID or group ID does not indicate that the target UE 115 is to monitor the next PSCCH period, the target UE 115 can return to idle mode and can monitor the next PSCCH period without waking up. As described herein, a WUS can be sent by a UE 115 on a side link, regardless of its coverage state with a base station 105 (e.g., within coverage, outside coverage, etc.). In such an example, a UE 115 having data to be sent to another UE 115 on a side link can send a WUS to the other UE 115, and the WUS (and corresponding WUS opportunity) can point to one or more resource pools. In other examples, each resource pool can have a WUS opportunity.

[0128] In some examples, UE 115 may relay uplink traffic for one or more other (e.g., out-of-coverage) UEs 115, which may provide coverage enhancement in the system. In this case, WUS transmissions from out-of-coverage UEs may be distributed. In some cases, there may be UE-specific WUS opportunities per resource pool, or there may be UE-specific WUS opportunities for a group of resource pools.

[0129] Figure 5A and Figure 5B Examples of control and data channel configurations 500-a and 500-b supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure are shown. In some examples, control and data channel configurations 500-a and 500-b can implement aspects of wireless communication systems 100, 200, and 300.

[0130] For example, about Figure 6The described PSCCH period may include both control and data channel aspects. The PSCCH period 515 may be configured in various ways and may include several side link time slots. The configuration structure of 500-a includes a PSCCH period 515 (consisting of 40, 80, 160 or 320 ms duration), which may include several time slots / subframes or a period of time slots / subframes. In some cases, the PSCCH 505 may include up to 40 subframes, and the PSCCH 505 may be sent at the beginning of the PSCCH period 515. The PSSCH data pool 510 may include the PSCCH 505 after the PSCCH period 515. For example, based on the bitmap, the number of subframes that may be included in the PSCCH period may be deduced. In some cases, the bitmap may be indicated using downlink control information (DCI) sent from the base station 105, or in some other cases, the DCI may be included as part of the resource pool configuration. The PSSCH bitmap may be repeated until the end of the PSCCH period.

[0131] Other configurations of the PSCCH period are possible, for example, the control and data aspects of the PSCCH period can be sent together (for example, each PSCCH and PSSCH pool can be sent together in one time slot). Configuration 500-b includes several transmission configurations for PSCCH and PSSCH, for example, in the case of Figures 6 to 7A 115. The configurations described for PSCCH and PSSCH may be sent on a sidelink channel by source UE 115.

[0132] Configuration 1A shows an example where PSCCH and PSSCH can be transmitted using non-overlapping time resources. In configuration 1A, the frequency resources used by both PSCCH and PSSCH can be the same. Configuration 1B shows an example where the frequency resources used by both PSCCH and PSSCH can be different.

[0133] Configuration 2 shows an example where PSCCH and PSSCH may be transmitted using non-overlapping frequency resources that may be associated with the time resources used for transmission. For example, the time resources used to transmit PSCCH and PSSCH may be the same.

[0134] Configuration 3 shows an example where a portion of the associated PSSCH and PSCCH may be transmitted using overlapping time resources in non-overlapping frequency resources. Additional portions of the associated PSSCH and / or additional portions of the PSCCH may also be transmitted using non-overlapping time resources.

[0135] Figure 6 An example of a resource pool configuration 600 that supports power saving techniques for sidelink communications in accordance with one or more aspects of the present disclosure is shown. In some examples, the resource pool configuration 600 can implement aspects of wireless communication systems 100, 200, and 300.

[0136] In some cases, the UE 115 may monitor several resource pools on the carrier 615. The UE 115 may monitor the resource pools to determine a resource or set of resources to use for sending information, e.g., via a sidelink.

[0137] The transmitting UE 115 may determine to use resources associated with resource pool 1 or resource pool 2 to transmit to the receiving UE 115. In some cases, each resource pool may be associated with a WUS opportunity 605. In some cases, based on different resource pools, the WUS opportunity 605 may be offset from each resource pool for different time periods. For example, the WUS opportunity 605-a may be offset from resource pool 1 by an offset 610-a, while the WUS opportunity 605-b may be offset from resource pool 2 by an offset 610-b. According to some aspects, the receiving UE 115 may monitor the WUS opportunities 605-a and 605-b associated with each resource pool, and based on the monitoring, the receiving UE 115 may determine whether it can stay awake to monitor the PSSCH and the associated data to be sent in the PSSCH period.

[0138] In some cases, there may be one WUS opportunity per BWP (each WUS may be a PDCCH sent over a PDCCH). Within the data payload of the PDCCH WUS, the transmitting UE 115 may include the ID of the resource pool it may use to send data. Additionally or alternatively, a WUS PDCCH may indicate (e.g., using a bitmap) which of the resource pools may be monitored by the receiving UE 115.

[0139] The BWP containing the WUS PDCCH or WUS sequence may be a default size. The UE 115 may monitor the WUS PDCCH in a default BWP according to the default size of the WUS PDCCH, which in some cases may be smaller than the PSCCH period. However, when the UE is instructed to start monitoring the PSCCH, the PSCCH / PSSCH BWP may be larger than the WUS opportunity, and the UE 115 may monitor the PSCCH for a longer period of time.

[0140] In another example, where multiple sidelink BWPs are configured, the WUS can be used to activate a sidelink BWP (or can be used to change the size of the sidelink BWP). In this case, the resource indication of the WUS indicates the resource pool of the activated BWP. The UE 115 can then determine which BWP can be used. In this case, the BWP size can be adjusted based on the traffic / data that can be communicated on the sidelink communication.

[0141] Each WUS may further indicate (e.g., using a bitmap) a number of time slots or a group of time slots in which the PSCCH (per resource pool, or for all resource pools) may be monitored. The transmitting UE 115 may transmit only in some time slots, so the bitmap included in the WUS may indicate whether a number of time slots or a group of time slots receiving UE should monitor the PSCCH (e.g., between every two WUS opportunities). For example, a 10-bit bitmap may indicate 10 opportunities to monitor the PSCCH. In addition, if the resource pool transmission is periodic, the bitmap may include 10 opportunities in each period to monitor the PSCCH. In this case, the UE 115 may not monitor whichever opportunity is not indicated by the bitmap.

[0142] Fig. 7A and Figure 7B An example of wireless communication systems 700-a and 700-b supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. In some examples, the wireless communication systems 700-a and 700-b can implement aspects of the wireless communication systems 100, 200, and 300. For example, the wireless communication systems 700-a and 700-b each include a base station 105-f and one or more UEs 115 (e.g., UE 115-k and UE 115-m), which can be referenced Figure 1 2 and 3. Wireless communication systems 700-a and 700-b may illustrate different resource pools associated with different numbers of MIMO layers.

[0143] In some examples, different resource pools monitored by a UE 115 may be associated with different numbers of MIMO layers used for different kinds of transmissions. For example, a given number of MIMO layers (e.g., 4 layers) may be used to send high data rate (HDR) transmissions, while a different number of MIMO layers (e.g., 2 layers) may be used to send other types of transmissions. In some cases, the number of layers used to receive data may be less than the number of layers used to send data, and thus, in some cases, a receiving UE 115 may shut down some of its functions when receiving data, which may increase energy savings.

[0144] UE 115-k may receive an indication from base station 105-f of resources that it may use to transmit via a sidelink with UE 115-m. According to a first mode (e.g., mode 1, in which base station 105-f indicates sidelink resources to UE 115-k), base station 105-f may use a buffer status report (BSR) 705 for sidelink transmissions to schedule sidelink resources on a resource pool according to the configured number of MIMO layers.

[0145] In another example, according to a second mode (e.g., mode 2, in which the transmitting UE 115-k indicates the sidelink resources to the UE 115-m), the transmitting UE 115-k may select a resource pool 715 with a configured number of MIMO layers. In some cases, when the UE 115-k determines which resource pool to use to transmit data, it may also determine the number of MIMO layers associated with each resource pool. The UE 115-k may relay an indication 710 of the resource pool and MIMO layer indication to the UE 115-m. For example, if the resource pool is associated with four MIMO layers, the UE 115 may receive the PSSCH associated with the four MIMO layers. However, if the UE 115 determines that it can only transmit information based on 2 layers, the UE 115 may turn off some of its antennas associated with the higher-level layers and may receive with these two layers. The MIMO layers may be associated with the resource pool configuration, so the transmitting device may know the number of layers associated with each resource pool. For example, if UE 115 receives an indication that a resource pool is configured for up to two MIMO layers, it may adjust its functionality accordingly to account for that configuration (e.g., it may turn on antennas needed to detect only two layers). Thus, the WUS may also be used to modify the number of MIMO layers by indicating which resource pool may be monitored.

[0146] Figure 8 A block diagram 800 of a device 805 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The device 805 may be an example of aspects of the UE 115 as described herein. The device 805 may include a receiver 810, a UE communication manager 815, and a transmitter 820. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0147] The receiver 810 may provide means for receiving information, such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to energy-saving techniques for sidelink communications, etc.). The information may be delivered to other components of the device 805. The receiver 810 may be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The receiver 810 may utilize a single antenna or a collection of antennas.

[0148] The UE communication manager 815 may be configured to provide or support a component for identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, sending a WUS to the second UE on the sidelink communication link (sending the WUS during a WUS opportunity associated with the set of one or more resources), and sending a message to the second UE using the set of one or more resources based on the WUS. The UE communication manager 815 may also be configured to provide or support a component for identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, receiving a WUS from the second UE on the sidelink communication link (receiving the WUS based on monitoring a WUS opportunity associated with the set of one or more resources), and monitoring the identified set of one or more resources for transmission from the second UE based on the received WUS. The UE communication manager 815 may be an example of various aspects of the UE communication manager 1110 described herein.

[0149] The UE communication manager 815 or its subcomponents may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. The UE communication manager may be an example of a component for performing various aspects of the energy-saving techniques for sidelink communications described herein. The communication manager 815 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit). The communication manager 815 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit). The circuit may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0150] In another implementation, the UE communication manager 815 or its subcomponents may be implemented in code executed by a processor (e.g., as communication management software or firmware) or any combination thereof. If implemented in code executed by a processor, the functions of the UE communication manager 815 or its subcomponents may be implemented by a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0151] In some examples, communication manager 815 may be configured to use or otherwise cooperate with receiver 810 , transmitter 820 , or both to perform various operations (eg, identifying, transmitting, etc.).

[0152] The UE communication manager 815 or its subcomponents may be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the UE communication manager 815 or its subcomponents may be separate and distinct components. In some examples, the UE communication manager 815 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof according to various aspects of the present disclosure.

[0153] The transmitter 820 may provide means for transmitting signals generated by other components of the device 805. In some examples, the transmitter 820 may be collocated with the receiver 810 in a transceiver module. For example, the transmitter 820 may be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The transmitter 820 may utilize a single antenna or a collection of antennas.

[0154] In some examples, the UE communications manager 815 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 810 and transmitter 820 may be implemented as analog components (e.g., amplifiers, filters, antennas, etc.) coupled to the mobile device modem to enable wireless transmission and reception.

[0155] The UE communication manager 815 as described herein may be implemented to achieve one or more potential advantages. Various implementations may enable the UE communication manager 815 to effectively receive and process WUS for sidelink and direct link communications between devices in a wireless network. At least one implementation may enable the UE communication manager 815 to effectively use MIMO technology for resource selection to further save energy for the sidelink.

[0156] Based on implementing the energy saving techniques described herein, one or more processors of the device 805 (e.g., a processor controlling or in conjunction with one or more of the receiver 810, the UE communication manager 815, and the transmitter 820) can reduce the amount of time the device is awake and reduce the consumption of excessive power, which can increase energy saving. In addition, the processor of the device 805 can be configured to selectively monitor the resource pool to reduce the exceeded wake-up time while monitoring the side link resources.

[0157] Fig. 9A block diagram 900 of a device 905 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of the UE 115 or device 805 as described herein. The device 905 may include a receiver 910, a UE communication manager 915, and a transmitter 940. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0158] The receiver 910 may provide means for receiving information, such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to energy-saving techniques for sidelink communications, etc.). The information may be delivered to other components of the device 905. The receiver 910 may be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The receiver 910 may utilize a single antenna or a collection of antennas.

[0159] UE communication manager 915 may be an example of aspects of UE communication manager 815 as described herein. UE communication manager 915 may include resource identification component 920, wake-up signal component 925, sidelink communication manager 930, and monitoring component 935. UE communication manager 915 may be an example of aspects of UE communication manager 1110 as described herein.

[0160] Resource identification component 920 may provide means for identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link.

[0161] The wake-up signal component 925 may provide means for sending a WUS to the second UE over the sidelink communication link, sending the WUS during a WUS opportunity associated with the set of one or more resources.

[0162] The sidelink communications manager 930 may provide means for sending a message to the second UE using a set of one or more resources based on the WUS.

[0163] The wake-up signal component 925 may provide means for receiving a WUS from the second UE over the sidelink communication link, receiving the WUS based on monitoring a WUS opportunity associated with a set of one or more resources.

[0164] Monitoring component 935 may provide means for monitoring the identified set of one or more resources for transmission from the second UE based on the received WUS.

[0165] The transmitter 940 may provide means for transmitting signals generated by other components of the device 905. In some examples, the transmitter 940 may be collocated with the receiver 910 in a transceiver module. For example, the transmitter 940 may be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The transmitter 940 may utilize a single antenna or a collection of antennas.

[0166] Fig.10 A block diagram 1000 of a UE communication manager 1005 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The UE communication manager 1005 may be an example of aspects of the UE communication manager 815, the UE communication manager 915, or the UE communication manager 1110 described herein. The UE communication manager 1005 may include a resource identification component 1010, a wake-up signal component 1015, a sidelink communication manager 1020, a resource selection component 1025, and a monitoring component 1030. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0167] Resource identification component 1010 can identify a set of one or more resources for sidelink communication with a second UE on a sidelink communication link. In some examples, resource identification component 1010 can receive a resource grant from a base station indicating a set of one or more resources for sidelink communication, wherein a WUS associated with the set of one or more resources is sent based on the resource grant.

[0168] In some examples, resource identification component 1010 may provide a component for identifying a set of one or more resources based on a received WUS. In some examples, resource identification component 1010 may provide a component for identifying a bitmap indicating a set of one or more resources based on the WUS. In some cases, the set of one or more resources is associated with a number of MIMO layers.

[0169] In some cases, the set of one or more resources is from a plurality of sets of resources for sidelink communication, each set of the plurality of sets of resources being associated with a corresponding WUS opportunity. In some cases, each set of the plurality of sets of resources is associated with a corresponding number of MIMO layers.

[0170] The wake-up signal component 1015 may provide a component for sending a WUS to a second UE on a sidelink communication link, sending the WUS during a WUS opportunity associated with a set of one or more resources. In some examples, the wake-up signal component 1015 may provide a component for receiving a WUS from a second UE on a sidelink communication link, receiving the WUS based on monitoring a WUS opportunity associated with a set of one or more resources. In some examples, the WUS is sent in a first BWP of the sidelink communication link, wherein sending the message includes sending the message in a second BWP different from the first BWP. In some cases, the second BWP is from a set of BWPs associated with the sidelink communication.

[0171] The sidelink communication manager 1020 may provide a component for sending a message to the second UE using a set of one or more resources based on the WUS. In some examples, the sidelink communication manager 1020 may provide a component for identifying one or more time slot groups for sending the message. In some examples, the sidelink communication manager 1020 may provide a component for sending the message during at least one of the one or more time slot groups, wherein the WUS indicates the one or more time slot groups to the second UE.

[0172] In some examples, sidelink communications manager 1020 may provide components for sending messages during one or more sidelink control channel periods, each sidelink control channel period including a physical sidelink control channel and a physical sidelink shared channel. In some cases, one or more time slot groups are indicated to the second UE via a bitmap or sequence. In some cases, each sidelink control channel period has a duration of one time slot.

[0173] Monitoring component 1030 may provide means for monitoring the identified set of one or more resources for transmissions from the second UE based on the received WUS. In some examples, monitoring component 1030 may provide means for identifying one or more time slot groups based on an indication associated with the received WUS, wherein monitoring the identified set of one or more resources for transmissions from the second UE is performed during each of the one or more time slot groups.

[0174] In some examples, monitoring component 1030 may provide a means for avoiding monitoring one or more time period groups based on the indication, the one or more time period groups comprising symbol periods, or time slots, or a combination thereof. In some examples, monitoring a WUS in a first BWP of a sidelink communication link, wherein monitoring a set of one or more resources for transmission comprises monitoring a second BWP different from the first BWP.

[0175] In some examples, monitoring component 1030 may provide a component for monitoring a set of one or more resources during one or more side link control channel periods, each side link control channel period including a physical side link control channel and a physical side link shared channel. In some cases, the indication includes a bitmap associated with the WUS. In some cases, the second BWP is from a set of BWPs associated with the side link communication. In some cases, each side link control channel period has a duration of a time slot.

[0176] In some cases, the physical sidelink control channel and the physical sidelink shared channel do not overlap in time, or do not overlap in frequency, or overlap in time, or overlap in frequency, or any combination thereof.

[0177] The resource selection component 1025 can select one or more sets of resources from multiple sets of resources for side link communication, each set of the multiple sets of resources is associated with a corresponding WUS opportunity, wherein a WUS associated with the set of one or more resources is sent based on the selected one or more sets of resources.

[0178] In some examples, resource selection component 1025 can determine a number of MIMO layers for communicating with the second UE on the sidelink communication link, wherein a set of one or more resources is selected based on the determined number of MIMO layers.

[0179] Fig.11 A schematic diagram of a system 1000 including a device 1105 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The device 1105 may be an example of or include components of a device 805, a device 905, or a UE 115 as described herein. The device 1105 may include components for two-way voice and data communications, including components for sending and receiving communications, including a UE communication manager 1110, an I / O controller 1115, a transceiver 1120, an antenna 1125, a memory 1130, and a processor 1140. These components may communicate electronically via one or more buses (e.g., a bus 1145).

[0180] The UE communication manager 1110 may be configured to provide or support a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, send a WUS to the second UE on the sidelink communication link (send the WUS during a WUS opportunity associated with the set of one or more resources), and send a message to the second UE using the set of one or more resources based on the WUS. The UE communication manager 1110 may also be configured to provide or support a set of one or more resources for identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link, receive a WUS from the second UE on the sidelink communication link (receive the WUS based on monitoring a WUS opportunity associated with the set of one or more resources), and monitor the identified set of one or more resources for transmission from the second UE based on the received WUS.

[0181] I / O controller 1115 can manage the input and output signals of device 1105. I / O controller 1115 can also manage peripheral devices that are not integrated into device 1105. In some cases, I / O controller 1115 can represent physical connection or port to external peripheral devices. In some cases, I / O controller 1115 can utilize operating system, such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX® or other known operating system. In other cases, I / O controller 1115 can represent modem, keyboard, mouse, touch screen or similar device or interact with it. In some cases, I / O controller 1115 can be implemented as a part of processor. In some cases, user can interact with device 1105 via I / O controller 1115 or via hardware components controlled by I / O controller 1115.

[0182] The transceiver 1120 can communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 1120 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1120 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission and demodulate packets received from the antenna.

[0183] In some cases, a wireless device may include a single antenna 1125. However, in some cases, a device may have more than one antenna 1125, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0184] Memory 1130 may include random access memory (RAM) and read-only memory (ROM). Memory 1130 may store computer-readable, computer-executable code 1135 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 1130 may additionally contain a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0185] Processor 1140 may include an intelligent hardware device, (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1140 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause device 1105 to perform various functions (e.g., functions or tasks that support energy-saving techniques for sidelink communications).

[0186] The code 1135 may include instructions to implement various aspects of the present disclosure, including instructions to support wireless communications. The code 1135 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1135 may not be directly executed by the processor 1140, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0187] Fig.12 A block diagram 1200 of a device 1205 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The device 1205 may be an example of aspects of a base station 105 as described herein. The device 1205 may include a receiver 1210, a base station communications manager 1215, and a transmitter 1220. The device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0188] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to energy-saving techniques for sidelink communications, etc.). The information may be delivered to other components of the device 1205. The receiver 1210 may be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The receiver 1210 may utilize a single antenna or a collection of antennas.

[0189] The base station communication manager 1215 may identify a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities, and send a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link. The base station communication manager 1215 may be an example of aspects of the base station communication manager 1510 described herein.

[0190] The base station communication manager 1215 may be an example of a component for performing various aspects of the energy saving techniques for sidelink communications described herein. The communication manager 1215 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit). The circuit may include a processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0191] In another implementation, the base station communication manager 1215 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., communication management software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the base station communication manager 1215 or its subcomponents may be implemented by a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0192] In some examples, base station communications manager 1215 may be configured to use or otherwise cooperate with receiver 1210 , transmitter 1220 , or both to perform various operations (eg, identifying, transmitting, etc.).

[0193] The base station communication manager 1215 or its subcomponents may be physically located in a variety of locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, the base station communication manager 1215 or its subcomponents may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the base station communication manager 1215 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

[0194] Transmitter 1220 can transmit signals generated by other components of device 1205. In some examples, transmitter 1220 can be collocated with receiver 1210 in a transceiver module. For example, transmitter 1220 can be a reference Fig.15Examples of various aspects of the transceiver 1520 are described. The transmitter 1220 may utilize a single antenna or a collection of antennas.

[0195] Fig.13 A block diagram 1300 of a device 1305 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The device 1305 may be an example of aspects of a base station 105 or a device 1205 as described herein. The device 1305 may include a receiver 1310, a base station communication manager 1315, and a transmitter 1330. The device 1305 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0196] The receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to energy-saving techniques for sidelink communications, etc.). The information may be delivered to other components of the device 1305. The receiver 1310 may be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The receiver 1310 may utilize a single antenna or a collection of antennas.

[0197] The base station communication manager 1315 may be an example of aspects of the base station communication manager 1215 as described herein. The base station communication manager 1315 may include a resource scheduling component 1320 and a grant manager 1325. The base station communication manager 1315 may be an example of aspects of the base station communication manager 1510 as described herein.

[0198] Resource scheduling component 1320 may identify a set of one or more resources for sidelink communication between a first UE and a second UE over a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities.

[0199] The grant manager 1325 may send a resource grant to the first UE to schedule a set of one or more resources on the sidelink communication link.

[0200] Transmitter 1330 can transmit signals generated by other components of device 1305. In some examples, transmitter 1330 can be collocated with receiver 1310 in a transceiver module. For example, transmitter 1330 can be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The transmitter 1330 may utilize a single antenna or a collection of antennas.

[0201] Fig.14A block diagram 1400 of a base station communication manager 1405 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The base station communication manager 1405 can be an example of aspects of the base station communication manager 1215, the base station communication manager 1315, or the base station communication manager 1510 described herein. The base station communication manager 1405 can include a resource scheduling component 1410, an authorization manager 1415, and a MIMO configuration component 1420. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0202] Resource scheduling component 1410 may identify a set of one or more resources for sidelink communication between a first UE and a second UE over a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities.

[0203] In some examples, resource scheduling component 1410 can select one or more sets of resources from a plurality of sets of resources for sidelink communication, each set of the plurality of sets of resources being associated with a respective WUS opportunity.

[0204] In some cases, the set of one or more resources includes one or more sidelink control channel periods, each sidelink control channel period including a physical sidelink control channel and a physical sidelink shared channel.

[0205] In some cases, each sidelink control channel period may have a duration of one time slot.

[0206] The grant manager 1415 may send a resource grant to the first UE to schedule a set of one or more resources on the sidelink communication link.

[0207] MIMO configuring component 1420 can determine a number of multiple-input multiple-output (MIMO) layers for sidelink communications, wherein a set of one or more resources is selected based on the determined number of MIMO layers.

[0208] Fig.15A schematic diagram of a system 1500 including a device 1505 supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The device 1505 may be an example of or include components of a base station 105, a device 1205, or a device 1305 as described herein. The device 1505 may include components for two-way voice and data communications, including components for sending and receiving communications, including a base station communication manager 1510, a network communication manager 1515, a transceiver 1520, an antenna 1525, a memory 1530, a processor 1540, and an inter-station communication manager 1545. These components may communicate electronically via one or more buses (e.g., a bus 1550).

[0209] The base station communication manager 1510 can identify a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities, and send a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link.

[0210] The network communications manager 1515 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1515 may manage data communication transfers for client devices, such as one or more UEs 115.

[0211] The transceiver 1520 can communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, the transceiver 1520 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1520 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission and demodulate packets received from the antenna.

[0212] In some cases, a wireless device may include a single antenna 1525. However, in some cases, a device may have more than one antenna 1525, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0213] Memory 1530 may include RAM, ROM, or a combination thereof. Memory 1530 may store computer readable code 1535 including instructions that, when executed by a processor (e.g., processor 1540), cause the device to perform various functions described herein. In some cases, memory 1530 may additionally include BIOS, which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0214] Processor 1540 may include an intelligent hardware device, (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1540 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause device 1505 to perform various functions (e.g., functions or tasks that support energy-saving techniques for sidelink communications).

[0215] The inter-site communication manager 1545 may manage communications with other base stations 105, and the inter-site communication manager 1545 may include a controller or scheduler for controlling and coordinating communications of the UE 115 with other base stations 105. For example, the inter-site communication manager 1545 may coordinate scheduling of transmissions to the UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1545 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0216] The code 1535 may include instructions to implement various aspects of the present disclosure, including instructions to support wireless communications. The code 1535 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1535 may not be directly executed by the processor 1540, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0217] Fig.16 A flow chart of a method 1600 for supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a UE 115 (eg, a first UE) or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE 115 (eg, a first UE) or a component thereof as described herein. Figures 8 to 11 The UE communication manager described herein performs. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0218] At 1605, the first UE may identify a set of one or more resources for sidelink communication with a second UE over a sidelink communication link. The operations of 1605 may be performed according to the methods described herein. In some examples, the Figures 8 to 11 The described resource identification component performs various aspects of the operation of 1605.

[0219] At 1610, the first UE may send a WUS to the second UE on the sidelink communication link, sending the WUS during a WUS opportunity associated with a set of one or more resources. The operations of 1610 may be performed according to the methods described herein. In some examples, the WUS may be sent by referring to Figures 8 to 11 The described wake-up signal component performs aspects of the operation of 1610 .

[0220] At 1615, the first UE may send a message to the second UE using a set of one or more resources based on the WUS. The operation of 1615 may be performed according to the methods described herein. In some examples, the method may be performed by referring to Figures 8 to 11 The described sidelink communications manager performs various aspects of the operations of 1615 .

[0221] Fig.17 A flow chart of a method 1700 for supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by a UE 115 (eg, a first UE) or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 (eg, a first UE) or a component thereof as described herein. Figures 8 to 11 The UE communication manager described herein performs. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0222] At 1705, the first UE may identify a set of one or more resources for sidelink communication with a second UE over a sidelink communication link. The operations of 1705 may be performed according to the methods described herein. In some examples, the Figures 8 to 11 The described resource identification component performs various aspects of the operation of 1705.

[0223] At 1710, the first UE may select one or more sets of resources from a plurality of sets of resources for sidelink communication, each set of the plurality of sets of resources being associated with a corresponding WUS opportunity, wherein a WUS associated with the one or more sets of resources is sent based on the selected one or more sets of resources. The operations of 1710 may be performed according to the methods described herein. In some examples, the WUS may be sent by referring to Figures 8 to 11 The described resource identification component performs aspects of the operation of 1710.

[0224] At 1715, the first UE may send a WUS to the second UE on the sidelink communication link, sending the WUS during a WUS opportunity associated with a set of one or more resources. The operations of 1715 may be performed according to the methods described herein. In some examples, the WUS may be sent by referring to Figures 8 to 11 The described wake-up signal component performs aspects of the operation of 1715 .

[0225] At 1720, the first UE may send a message to the second UE using a set of one or more resources based on the WUS. The operations of 1720 may be performed according to the methods described herein. In some examples, the Figures 8 to 11 The described sidelink communications manager performs aspects of the operations of 1720.

[0226] Fig.18 A flow chart of a method 1800 for supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by a UE 115 (eg, a first UE) or a component thereof as described herein. For example, the operations of the method 1800 may be implemented by a UE 115 (eg, a first UE) or a component thereof as described herein. Figures 8 to 11 The UE communication manager described herein performs. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0227] At 1805, the first UE may identify a set of one or more resources for sidelink communication with a second UE over a sidelink communication link. The operations of 1805 may be performed according to the methods described herein. In some examples, the Figures 8 to 11 The described resource identification component performs various aspects of the operations of 1805.

[0228] At 1810, the first UE may receive a WUS from the second UE on the sidelink communication link, based on monitoring a WUS opportunity associated with a set of one or more resources. The operations of 1810 may be performed according to the methods described herein. In some examples, the WUS may be received by the second UE as described in reference to Figures 8 to 11 The described wake-up signal component performs aspects of the operation of 1810 .

[0229] At 1815, the UE may monitor the set of one or more identified resources for transmissions from the second UE based on the received WUS. The operations of 1815 may be performed according to the methods described herein. In some examples, the UE may monitor the set of one or more identified resources for transmissions from the second UE based on the received WUS. Figures 8 to 11 The described resource identification component performs various aspects of the operation of 1815.

[0230] Fig.19 1 is a flow chart of a method 1900 for supporting energy-saving techniques for sidelink communications according to one or more aspects of the present disclosure. The operations of the method 1900 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1900 may be implemented by a base station 105 or a component thereof as described herein. Figures 12 to 15The base station communication manager described herein performs. In some examples, the base station may execute an instruction set to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0231] At 1905, the base station may identify a set of one or more resources for sidelink communication between a first UE and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities. The operations of 1905 may be performed according to the methods described herein. In some examples, the base station may be configured as described in reference to Figures 12 to 15 The described resource scheduling component performs various aspects of the operation of 1905.

[0232] At 1910, the base station may send a resource grant to the first UE to schedule a set of one or more resources on a sidelink communication link. The operations of 1910 may be performed according to the methods described herein. In some examples, the Figures 12 to 15 Aspects of the operations of the described authorization manager execution 1910.

[0233] The following provides an overview of examples of the present disclosure.

[0234] Example 1: A method for wireless communication at a first UE, comprising: identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link; sending a WUS to the second UE on the sidelink communication link, sending the WUS during a WUS opportunity associated with the set of one or more resources; and sending a message to the second UE using the set of one or more resources based at least in part on the WUS.

[0235] Example 2: A method according to Example 1, wherein identifying the set of one or more resources includes: receiving a resource grant from a base station indicating the set of one or more resources for the sidelink communication, wherein a WUS associated with the set of one or more resources is sent at least in part based on the resource grant.

[0236] Example 3: The method of Examples 1 to 2, wherein the set of one or more resources is associated with a number of multiple-input multiple-output (MIMO) layers.

[0237] Example 4: A method according to Examples 1 to 3, wherein identifying the set of one or more resources includes: selecting the set of one or more resources from multiple sets of resources used for the side link communication, each set of the multiple sets of resources being associated with a corresponding WUS opportunity, wherein a WUS associated with the set of one or more resources is sent at least in part based on the selected set of one or more resources.

[0238] Example 5: According to the method of Example 4, it also includes: determining the number of multiple-input multiple-output (MIMO) layers for communicating with the second UE on the sidelink communication link, wherein the set of one or more resources is selected at least in part based on the determined number of MIMO layers.

[0239] Example 6: The method according to any one of Examples 1 to 5 also includes: identifying one or more time slot groups for sending the message; and sending the message during at least one of the one or more time slot groups, wherein the WUS indicates the one or more time slot groups to the second UE.

[0240] Example 7: A method according to Example 6, wherein the one or more time slot groups are indicated to the second UE via a bitmap or a sequence.

[0241] Example 8: The method according to any one of Examples 1 to 7 further includes: sending a WUS in a first BWP of the side link communication link, wherein sending the message includes sending the message in a second BWP different from the first BWP.

[0242] Example 9: The method of Example 8, wherein the second BWP is from a set of BWPs associated with the sidelink communication.

[0243] Example 10: A method according to any one of Examples 1 to 9, wherein sending the message includes: sending the message during one or more sidelink communication periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

[0244] Example 11: The method of Example 10, wherein each sidelink control channel period has a duration of one time slot.

[0245] Example 12: A method for wireless communication at a first user equipment (UE), comprising: identifying a set of one or more resources for sidelink communication with a second UE on a sidelink communication link; receiving a WUS from the second UE on the sidelink communication link, receiving the WUS based at least in part on monitoring a WUS opportunity associated with the set of one or more resources; and monitoring the identified set of one or more resources for transmission from the second UE based at least in part on the received WUS.

[0246] Example 13: The method of Example 12, wherein identifying the set of one or more resources comprises: identifying the set of one or more resources based at least in part on the received WUS.

[0247] Example 14: The method of Example 13, further comprising: identifying a bitmap indicating the set of the one or more resources based at least in part on the WUS.

[0248] Example 15: The method according to any one of Examples 12 to 14, further comprising: identifying one or more time slot groups based at least in part on the indication associated with the received WUS, wherein monitoring the set of the identified one or more resources used for the transmission from the second UE is performed during each of the one or more time slot groups.

[0249] Example 16: The method of Example 15 further includes: avoiding monitoring one or more time period groups based at least in part on the indication, the one or more time period groups including symbol periods, or time slots, or a combination thereof.

[0250] Example 17: The method of any one of Examples 15 to 16, wherein the indication comprises a bitmap associated with the WUS.

[0251] Example 18: A method according to any one of Examples 12 to 17, wherein the set of one or more resources is from multiple sets of resources used for the sidelink communication, each set of the multiple sets of resources is associated with a corresponding WUS opportunity.

[0252] Example 19: The method of any one of Examples 12 to 18, wherein each of the multiple sets of resources is associated with a corresponding number of multiple-input multiple-output (MIMO) layers.

[0253] Example 20: The method according to any one of Examples 12 to 19 further includes: monitoring a WUS in a first BWP of the sidelink communication link, wherein monitoring the set of one or more resources used for the transmission includes monitoring a second BWP different from the first BWP.

[0254] Example 21: The method of Example 20, wherein the second BWP is from a set of BWPs associated with the sidelink communication.

[0255] Example 22: A method according to any one of Examples 12 to 21, wherein monitoring the set of one or more resources used for the transmission includes: monitoring the set of one or more resources during one or more sidelink control channel periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

[0256] Example 23: The method of Example 22, wherein each sidelink control channel period has a duration of one time slot.

[0257] Example 24: A method according to any one of Examples 22 to 23, wherein the physical side link control channel and the physical side link shared channel do not overlap in time, or do not overlap in frequency, or overlap in time, or overlap in frequency, or any combination thereof.

[0258] Example 25: A method for wireless communication at a base station, comprising: identifying a set of one or more resources for sidelink communication between a first user equipment (UE) and a second UE on a sidelink communication link, wherein the set of one or more resources is associated with one or more WUS opportunities; and sending a resource grant to the first UE to schedule the set of one or more resources on the sidelink communication link.

[0259] Example 26: A method according to Example 25, wherein identifying the set of one or more resources includes: selecting the set of one or more resources from multiple sets of resources used for the side link communication, each set of the multiple sets of resources being associated with a corresponding WUS opportunity.

[0260] Example 27: A method according to Example 26, wherein identifying the set of one or more resources includes: determining a number of multiple-input multiple-output (MIMO) layers for the sidelink communication, wherein the set of one or more resources is selected at least in part based on the determined number of MIMO layers.

[0261] Example 28: A method according to any one of Examples 25 to 27, wherein the set of one or more resources includes one or more sidelink control channel periods, and each sidelink communication period includes a physical sidelink control channel and a physical sidelink shared channel.

[0262] Example 29: The method of Example 28, wherein each sidelink control channel period has a duration of one time slot.

[0263] Example 30: An apparatus for wireless communication, comprising at least one component for performing the method of any one of Examples 1 to 11.

[0264] Example 31: An apparatus for wireless communication, comprising at least one component for performing the method of any one of Examples 12 to 24.

[0265] Example 32: An apparatus for wireless communication, comprising at least one component for performing the method of any one of Examples 25 to 29.

[0266] Example 33: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 1 to 11.

[0267] Example 34: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 12 to 24.

[0268] Example 35: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 25 to 29.

[0269] Example 36: A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of Examples 1 to 11.

[0270] Example 37: A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of Examples 12 to 24.

[0271] Example 38: A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of Examples 25 to 29.

[0272] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more of the methods may be combined.

[0273] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in many descriptions, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0274] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0275] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0276] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or sent as one or more instructions or codes on a computer-readable medium. Other examples and implementations are also within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0277] Computer-readable media include both non-transitory computer storage media and communication media (including any media that facilitates the transfer of computer programs from one place to another). Non-transitory storage media can be any available media that can be accessed by a general or special computer. For example and without limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory media that can be used to carry or store the required program code methods in the form of instructions or data structures and can be accessed by a general or special computer, or a general or special processor. Moreover, any connection is appropriately referred to as a computer-readable medium. For example, if software is sent from a website, server or other remote source using coaxial cable, optical cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave), coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) are included in the definition of computer-readable media. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0278] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one" or "one or more") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Moreover, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example operation described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0279] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes the similar components. If only the first reference label is used in the specification, the description applies to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0280] In conjunction with the accompanying drawings, the description set forth herein describes exemplary configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "better than other examples." For the purpose of providing an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0281] The description herein is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), comprising: identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; sending a wake-up signal to the second UE over the sidelink communication link, the wake-up signal being sent during a wake-up signal opportunity associated with the set of one or more resources; and Based at least in part on the wake-up signal, a message is sent to the second UE using the set of one or more resources.

2. The method according to claim 1, wherein: Identifying the set of one or more resources includes: The set of one or more resources is selected from a plurality of sets of resources for the side link communication, each set of the plurality of resources being associated with a corresponding wake-up signal opportunity, wherein the wake-up signal associated with the set of one or more resources is sent based at least in part on the selected set of one or more resources.

3. The method according to claim 2, further comprising: A number of multiple-input multiple-output (MIMO) layers is determined for communicating with the second UE over the sidelink communication link, wherein the set of one or more resources is selected based at least in part on the determined number of MIMO layers.

4. The method according to claim 1, wherein: Identifying the set of one or more resources includes: A resource grant is received from a base station indicating the set of one or more resources for the sidelink communication, wherein the wake-up signal associated with the set of one or more resources is sent based at least in part on the resource grant.

5. The method according to claim 4, wherein: The set of one or more resources is associated with a number of multiple-input multiple-output (MIMO) layers.

6. The method according to claim 1, further comprising: identifying one or more time slot groups for transmitting the message; as well as The message is sent during at least one of the one or more time slot groups, wherein the wake-up signal indicates the one or more time slot groups to the second UE.

7. The method according to claim 6, wherein: The one or more time slot groups are indicated to the second UE via a bitmap or a sequence.

8. The method according to claim 1, further comprising: and sending the wake-up signal in a first bandwidth portion of the sidelink communication link, wherein sending the message comprises: The message is sent in a second bandwidth portion different from the first bandwidth portion.

9. The method according to claim 8, wherein: The second bandwidth portion is from a set of bandwidth portions associated with the sidelink communication.

10. The method according to claim 1, wherein: Sending the message includes: The message is sent during one or more sidelink communication periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

11. The method according to claim 10, wherein: Each sidelink control channel period has a duration of one time slot.

12. A method for wireless communication at a first user equipment (UE), comprising: identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; receiving a wake-up signal from the second UE over the sidelink communications link, the wake-up signal being received based at least in part on monitoring a wake-up signal opportunity associated with the set of one or more resources; as well as Based at least in part on the received wake-up signal, the identified set of one or more resources is monitored for transmissions from the second UE.

13. The method according to claim 12, wherein: Identifying the set of one or more resources includes: The set of one or more resources is identified based at least in part on the received wake-up signal.

14. The method according to claim 13, further comprising: A bitmap indicative of the set of one or more resources is identified based at least in part on the wake-up signal.

15. The method according to claim 12, further comprising: One or more time slot groups are identified based at least in part on an indication associated with the received wake-up signal, wherein monitoring the identified set of one or more resources for transmissions from the second UE is performed during each of the one or more time slot groups.

16. The method according to claim 15, further comprising: Monitoring of one or more time period groups is avoided based at least in part on the indication, the one or more time period groups comprising symbol periods, or time slots, or a combination thereof.

17. The method according to claim 15, wherein: The indication includes a bitmap associated with the wake-up signal.

18. The method according to claim 12, wherein: The set of one or more resources is from a plurality of sets of resources used for the sidelink communication, each set of the plurality of sets of resources being associated with a respective wake-up signal opportunity.

19. The method according to claim 18, wherein: Each of the plurality of sets of resources is associated with a corresponding number of multiple-input multiple-output (MIMO) layers.

20. The method of claim 12, further comprising: and monitoring a first bandwidth portion of the sidelink communication link for the wake-up signal, wherein monitoring the set of one or more resources used for the transmission comprises: A second bandwidth portion different from the first bandwidth portion is monitored.

21. The method according to claim 20, wherein: The second bandwidth portion is from a set of bandwidth portions associated with the sidelink communication.

22. The method according to claim 12, wherein: Monitoring the set of one or more resources used for the transmission comprises: The set of one or more resources is monitored during one or more sidelink control channel periods, each sidelink communication period comprising a physical sidelink control channel and a physical sidelink shared channel.

23. The method according to claim 22, wherein: Each sidelink control channel period has a duration of one time slot.

24. The method according to claim 22, wherein: The physical side link control channel and the physical side link shared channel do not overlap in time, or do not overlap in frequency, or overlap in time, or overlap in frequency, or any combination thereof.

25. A method for wireless communication at a base station, comprising: identifying a set of one or more resources for sidelink communication between a first user equipment (UE) and a second UE over a sidelink communication link, wherein the set of one or more resources is associated with one or more wake-up signal opportunities; and A resource grant is sent to the first UE to schedule the set of one or more resources on the sidelink communications link.

26. The method according to claim 25, wherein: Identifying the set of one or more resources includes: The set of one or more resources is selected from a plurality of sets of resources for the sidelink communication, each set of the plurality of sets of resources being associated with a respective wake-up signal opportunity.

27. The method according to claim 26, wherein: Identifying the set of one or more resources includes: A number of multiple-input multiple-output (MIMO) layers for the sidelink communication is determined, wherein the set of one or more resources is selected based at least in part on the determined number of MIMO layers.

28. The method according to claim 25, wherein: The set of one or more resources includes one or more sidelink control channel periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

29. The method according to claim 28, wherein: Each sidelink control channel period has a duration of one time slot.

30. An apparatus for wireless communication at a first user equipment (UE), comprising: means for identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; means for sending a wake-up signal to the second UE over the sidelink communications link, the wake-up signal being sent during a wake-up signal opportunity associated with the set of one or more resources; as well as Means for sending a message to the second UE using the set of one or more resources based at least in part on the wake-up signal.

31. The device according to claim 30, wherein The means for identifying the set of one or more resources comprises: A component for selecting the set of one or more resources from a plurality of sets of resources for the sidelink communication, each set of the plurality of sets of resources being associated with a corresponding wake-up signal opportunity, wherein the wake-up signal associated with the set of one or more resources is sent based at least in part on the selected set of one or more resources.

32. The apparatus of claim 31 , further comprising: means for determining a number of multiple-input multiple-output (MIMO) layers for communicating with the second UE over the sidelink communications link, wherein the set of one or more resources is selected based at least in part on the determined number of MIMO layers.

33. The device according to claim 30, wherein: The means for identifying the set of one or more resources comprises: Means for receiving, from a base station, a resource grant indicating the set of one or more resources for the sidelink communication, wherein sending the wake-up signal associated with the set of one or more resources is based at least in part on the resource grant.

34. The device according to claim 33, wherein The set of one or more resources is associated with a number of multiple-input multiple-output (MIMO) layers.

35. The apparatus of claim 30, further comprising: means for identifying one or more groups of time slots for transmitting said message; as well as means for transmitting the message during at least one of the one or more time slot groups, wherein the wake-up signal indicates the one or more time slot groups to the second UE.

36. The device according to claim 35, wherein The one or more time slot groups are indicated to the second UE via a bitmap or a sequence.

37. The apparatus of claim 30, further comprising: means for sending the wake-up signal in a first bandwidth portion of the sidelink communication link, wherein the means for sending the message comprises: Means for transmitting the message in a second bandwidth portion different from the first bandwidth portion.

38. The device according to claim 37, wherein The second bandwidth portion is from a set of bandwidth portions associated with the sidelink communication.

39. The device according to claim 30, wherein: The means for sending the message comprises: Means for transmitting the message during one or more sidelink communication periods, each sidelink communication period comprising a physical sidelink control channel and a physical sidelink shared channel.

40. The device according to claim 39, wherein Each sidelink control channel period has a duration of one time slot.

41. An apparatus for wireless communication at a first user equipment (UE), comprising: means for identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; means for receiving a wake-up signal from the second UE over the sidelink communications link, receiving the wake-up signal based at least in part on monitoring a wake-up signal opportunity associated with the set of one or more resources; as well as Means for monitoring the identified set of one or more resources for transmission from the second UE based at least in part on the received wake-up signal.

42. The device according to claim 41, wherein The means for identifying the set of one or more resources comprises: Means for identifying the set of one or more resources based at least in part on the received wake-up signal.

43. The apparatus of claim 42, further comprising: Means for identifying a bitmap indicative of the set of one or more resources based at least in part on the wake-up signal.

44. The apparatus of claim 41, further comprising: means for identifying one or more time slot groups based at least in part on an indication associated with the received wake-up signal, wherein monitoring the identified set of one or more resources for transmissions from the second UE is performed during each of the one or more time slot groups.

45. The apparatus of claim 44, further comprising: Means for refraining from monitoring one or more groups of time periods based at least in part on the indication, the one or more groups of time periods comprising symbol periods, or time slots, or a combination thereof.

46. ​​The device according to claim 44, wherein The indication includes a bitmap associated with the wake-up signal.

47. The apparatus of claim 41, wherein: The set of one or more resources is from a plurality of sets of resources used for the sidelink communication, each set of the plurality of sets of resources being associated with a respective wake-up signal opportunity.

48. The apparatus of claim 47, wherein: Each of the plurality of sets of resources is associated with a corresponding number of multiple-input multiple-output (MIMO) layers.

49. The apparatus of claim 41, further comprising: means for monitoring the wake-up signal in a first bandwidth portion of the sidelink communication link, wherein the means for monitoring the set of one or more resources used for the transmission comprises: Means for monitoring a second bandwidth portion different from said first bandwidth portion.

50. The apparatus of claim 49, wherein: The second bandwidth portion is from a set of bandwidth portions associated with the sidelink communication.

51. The apparatus of claim 41, wherein: The means for monitoring the set of one or more resources used for the transmission comprises: Means for monitoring the set of one or more resources during one or more sidelink control channel periods, each sidelink communication period comprising a physical sidelink control channel and a physical sidelink shared channel.

52. The apparatus of claim 51, wherein: Each sidelink control channel period has a duration of one time slot.

53. The apparatus of claim 51, wherein: The physical side link control channel and the physical side link shared channel do not overlap in time, or do not overlap in frequency, or overlap in time, or overlap in frequency, or any combination thereof.

54. An apparatus for wireless communication at a base station, comprising: means for identifying a set of one or more resources for sidelink communication between a first user equipment (UE) and a second UE over a sidelink communication link, wherein the set of one or more resources is associated with one or more wake-up signal opportunities; and Means for sending a resource grant to the first UE for scheduling the set of one or more resources on the sidelink communications link.

55. The apparatus of claim 54, wherein: The means for identifying the set of one or more resources comprises: Means for selecting the set of one or more resources from a plurality of sets of resources for the sidelink communication, each set of the plurality of sets of resources being associated with a respective wake-up signal opportunity.

56. The apparatus of claim 55, wherein: The means for identifying the set of one or more resources comprises: Means for determining a number of multiple-input multiple-output (MIMO) layers for the sidelink communication, wherein the set of one or more resources is selected based at least in part on the determined number of MIMO layers.

57. The apparatus of claim 54, wherein: The set of one or more resources includes one or more sidelink control channel periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

58. The apparatus of claim 57, wherein: Each sidelink control channel period has a duration of one time slot.

59. An apparatus for wireless communication at a first user equipment (UE), comprising: processor; and A memory is coupled to the processor, the processor and the memory being configured to: identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; sending a wake-up signal to the second UE over the sidelink communication link, the wake-up signal being sent during a wake-up signal opportunity associated with the set of one or more resources; and Based at least in part on the wake-up signal, a message is sent to the second UE using the set of one or more resources.

60. The apparatus of claim 59, wherein: The processor and memory are configured to: The set of one or more resources is selected from a plurality of sets of resources for the side link communication, each set of the plurality of resources being associated with a corresponding wake-up signal opportunity, wherein the wake-up signal associated with the set of one or more resources is sent based at least in part on the selected set of one or more resources.

61. The apparatus of claim 60, wherein: The processor and memory are configured to: A number of multiple-input multiple-output (MIMO) layers is determined for communicating with the second UE over the sidelink communication link, wherein the set of one or more resources is selected based at least in part on the determined number of MIMO layers.

62. The apparatus of claim 59, wherein: The processor and memory are configured to: A resource grant is received from a base station indicating the set of one or more resources for the sidelink communication, wherein the wake-up signal associated with the set of one or more resources is sent based at least in part on the resource grant.

63. The device according to claim 62, wherein The set of one or more resources is associated with a number of multiple-input multiple-output (MIMO) layers.

64. The apparatus of claim 59, wherein: The processor and memory are configured to: identifying one or more time slot groups for transmitting the message; and The message is sent during at least one of the one or more time slot groups, wherein the wake-up signal indicates the one or more time slot groups to the second UE.

65. The apparatus of claim 64, wherein: The one or more time slot groups are indicated to the second UE via a bitmap or a sequence.

66. The apparatus of claim 59, wherein: The processor and memory are configured to: sending the wake-up signal in a first bandwidth portion of the sidelink communication link, the processor and memory being further configured to: The message is sent in a second bandwidth portion different from the first bandwidth portion.

67. The apparatus of claim 66, wherein: The second bandwidth portion is from a set of bandwidth portions associated with the sidelink communication.

68. The apparatus of claim 59, wherein: The processor and memory are configured to: The message is sent during one or more sidelink communication periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

69. The apparatus of claim 68, wherein: Each sidelink control channel period has a duration of one time slot.

70. An apparatus for wireless communication at a first user equipment (UE), comprising: processor; and A memory is coupled to the processor, the processor and the memory being configured to: identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; receiving a wake-up signal from the second UE over the sidelink communications link, the wake-up signal being received based at least in part on monitoring a wake-up signal opportunity associated with the set of one or more resources; as well as Based at least in part on the received wake-up signal, the identified set of one or more resources is monitored for transmissions from the second UE.

71. The apparatus of claim 70, wherein: The processor and memory are configured to: The set of one or more resources is identified based at least in part on the received wake-up signal.

72. The apparatus of claim 71, wherein: The processor and memory are configured to: A bitmap indicative of the set of one or more resources is identified based at least in part on the wake-up signal.

73. The apparatus of claim 70, wherein: The processor and memory are configured to: One or more time slot groups are identified based at least in part on an indication associated with the received wake-up signal, wherein monitoring the identified set of one or more resources for transmissions from the second UE is performed during each of the one or more time slot groups.

74. The apparatus of claim 73, wherein: The processor and memory are configured to: Monitoring of one or more time period groups is avoided based at least in part on the indication, the one or more time period groups comprising symbol periods, or time slots, or a combination thereof.

75. The apparatus of claim 73, wherein: The indication includes a bitmap associated with the wake-up signal.

76. The apparatus of claim 70, wherein: The set of one or more resources is from a plurality of sets of resources used for the sidelink communication, each set of the plurality of sets of resources being associated with a respective wake-up signal opportunity.

77. The apparatus of claim 76, wherein: Each of the plurality of sets of resources is associated with a corresponding number of multiple-input multiple-output (MIMO) layers.

78. The apparatus of claim 70, wherein: The processor and memory are configured to: monitoring the wake-up signal in a first bandwidth portion of the sidelink communication link, the processor and memory being further configured to: A second bandwidth portion different from the first bandwidth portion is monitored.

79. The apparatus of claim 78, wherein: The second bandwidth portion is from a set of bandwidth portions associated with the sidelink communication.

80. The apparatus of claim 70, wherein: The processor and memory are configured to: The set of one or more resources is monitored during one or more sidelink control channel periods, each sidelink communication period comprising a physical sidelink control channel and a physical sidelink shared channel.

81. The apparatus of claim 80, wherein: Each sidelink control channel period has a duration of one time slot.

82. The apparatus of claim 80, wherein: The physical side link control channel and the physical side link shared channel do not overlap in time, or do not overlap in frequency, or overlap in time, or overlap in frequency, or any combination thereof.

83. An apparatus for wireless communication at a base station, comprising: processor; and A memory is coupled to the processor, the processor and the memory being configured to: identifying a set of one or more resources for sidelink communication between a first user equipment (UE) and a second UE over a sidelink communication link, wherein the set of one or more resources is associated with one or more wake-up signal opportunities; as well as A resource grant is sent to the first UE to schedule the set of one or more resources on the sidelink communications link.

84. The apparatus of claim 83, wherein: The processor and memory are configured to: The set of one or more resources is selected from a plurality of sets of resources for the sidelink communication, each set of the plurality of sets of resources being associated with a respective wake-up signal opportunity.

85. The apparatus of claim 84, wherein: The processor and memory are configured to: A number of multiple-input multiple-output (MIMO) layers for the sidelink communication is determined, wherein the set of one or more resources is selected based at least in part on the determined number of MIMO layers.

86. The apparatus of claim 83, wherein: The set of one or more resources includes one or more sidelink control channel periods, each sidelink communication period including a physical sidelink control channel and a physical sidelink shared channel.

87. The apparatus of claim 86, wherein: Each sidelink control channel period has a duration of one time slot.

88. A non-transitory computer-readable medium storing code for wireless communication at a first user equipment (UE), the code comprising instructions executable by a processor to: identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; sending a wake-up signal to the second UE over the sidelink communication link, the wake-up signal being sent during a wake-up signal opportunity associated with the set of one or more resources; and Based at least in part on the wake-up signal, a message is sent to the second UE using the set of one or more resources.

89. A non-transitory computer-readable medium storing code for wireless communication at a first user equipment (UE), the code comprising instructions executable by a processor to: identifying a set of one or more resources for sidelink communications with a second UE over a sidelink communications link; receiving a wake-up signal from the second UE over the sidelink communications link, the wake-up signal being received based at least in part on monitoring a wake-up signal opportunity associated with the set of one or more resources; and Based at least in part on the received wake-up signal, the identified set of one or more resources is monitored for transmissions from the second UE.

90. A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to: identifying a set of one or more resources for sidelink communication between a first user equipment (UE) and a second UE over a sidelink communication link, wherein: The set of one or more resources is associated with one or more wake-up signal opportunities; as well as A resource grant is sent to the first UE to schedule the set of one or more resources on the sidelink communications link.

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