Methods, systems, and devices for wireless communications are described. For example, a base station may receive, from a first user equipment (UE), an uplink message that includes one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs and may associate each of the one or more sidelink communication identifications with a corresponding second identification also associated with each of the set of one or more UEs. The base station may transmit one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications. A second UE may receive, while in the inactive mode from the base station, the one or more signals that trigger the transition and may communicate with the first UE based on receiving the wake-up signal.

FIELD OF TECHNOLOGY

The following relates to wireless communications, including sidelink-induced Uu wake-up signal (WUS).

BACKGROUND

In some examples, the UEs of the wireless multiple-access communications system may be configured with one or more mechanisms for coordinated communications with a base station. For example, a first UE may enter an inactive mode according to a discontinuous communication cycle and may enter an active mode according to the cycle to receive downlink communications from a base station. In some examples, the base station may determine to communicate with the first UE when in the inactive mode and may transmit a wake-up signal (WUS) to the first UE.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support sidelink-induced Uu wake-up signal (WUS). Generally, the described techniques provide for mechanisms for communications with a UE during a sleep duration (OFF duration, inactive duration) of a discontinuous communication cycle, such as a discontinuous reception (DRX) cycle. For example, a base station may transmit a WUS to a UE which may prompt the UE to enter an active mode (e.g., wake mode) for an active duration and receive communications from another UE as a result of being awakened.

In some examples, the UEs of the wireless multiple-access communications system may be configured for sidelink communications. For example, a first UE may determine to perform sidelink communications with a second UE while the second UE is in the inactive mode. A base station may be configured to transmit a WUS in such situations. The first UE may transmit an uplink message including a sidelink ID of the second UE to the base station. The first UE may have received the sidelink ID of the second UE in a previous sidelink communication with the second UE. The base station may receive the sidelink ID of the second UE and may associate the sidelink ID with a Uu ID of the second UE. The base station may transmit a WUS to the second UE which may prompt the second UE to enter an active mode for communications with the first UE, the base station, or both.

A method for wireless communication at a base station is described. The method may include receiving, from a first user equipment (UE), an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs, associating each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs, and transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs, associate, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs, and transmit one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

Another apparatus for wireless communication at a base station is described. The apparatus may include means for receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs, means for associating each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs, and means for transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

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 receive, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs, associate, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs, and transmit one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more signals may include operations, features, means, or instructions for transmitting the one or more signals using a first set of resources that may be different from a second set of resources used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more signals may include operations, features, means, or instructions for transmitting the one or more signals using a first sequence that may be different from a second sequence used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more signals may include operations, features, means, or instructions for transmitting the one or more signals using a sequence that may be indicative of a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for both the sidelink communications and base station-UE communications.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting radio resource control signaling in order to configure the set of one or more UEs with resources or sequences to be used in the transmitting of the one or more signals, where the resources or sequences may be different from wake-up resources or sequences used for base station-UE communications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more signals may include operations, features, means, or instructions for transmitting the one or more signals as wake-up signals that include first payloads that indicate that the wake-up signals may be for transitioning each of the set of one or more UEs from the inactive mode to the active mode for the sidelink communications during a first duration of time, where the first payloads may be different from second payloads that indicate that the wake-up signals may be for transitioning each of the set of one or more UEs for base station-UE communications or for both the sidelink communications and the base station-UE communications during a second duration of time.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more signals may include operations, features, means, or instructions for transmitting the one or more signals as wake-up signals that include an indication of a first pool of resources for the set of one or more UEs to monitor for sidelink communications after transitioning from the inactive mode to the active mode, where the first pool of resources may be different from a second pool of resources configured for base station-UE communications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more signals may include operations, features, means, or instructions for transmitting a group wake-up signal to each of the set of one or more UEs.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that at least one UE of the set of one or more UEs may be connected to a second base station and transmitting, to the second base station, a message that includes a sidelink communication identification of the at least one UE to trigger the second base station to transmit a wake-up signal to the at least one UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the message may be transmitted via an X2 interface.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the uplink message may include operations, features, means, or instructions for receiving either a scheduling request or a buffer status report as the uplink message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more sidelink communication identifications include layer1identifiers, layer2identifiers, or layer3identifiers and the set of second identifications includes a set of Uu interface identifiers.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the set of Uu interface identifiers includes a set of cell radio network temporary identifiers.

A method for wireless communication at a first UE is described. The method may include receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE, determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode, transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE, and communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE, determine, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode, transmit an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE, and communicate with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE, means for determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode, means for transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE, and means for communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

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 receive, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE, determine, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode, transmit an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE, and communicate with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the uplink message may include operations, features, means, or instructions for transmitting, in the uplink message, multiple identifications of multiple UEs with which the first UE may be to communicate via sidelink communications, the second UE being one of the multiple UEs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the uplink message may include operations, features, means, or instructions for transmitting a scheduling request or a buffer status report as the uplink message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the sidelink message may include operations, features, means, or instructions for receiving an indication of a discontinuous reception cycle associated with communications at the second UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink communications include groupcast or unicast communications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the identification of the second UE may be one of a layer1identifier, a layer2identifier, a layer3identifier.

A method for wireless communication at a second UE is described. The method may include transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE, receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message, and communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

An apparatus for wireless communication at a second UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE, receive, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message, and communicate with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

Another apparatus for wireless communication at a second UE is described. The apparatus may include means for transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE, means for receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message, and means for communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

A non-transitory computer-readable medium storing code for wireless communication at a second UE is described. The code may include instructions executable by a processor to transmit, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE, receive, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message, and communicate with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the wake-up signal triggering the transition from the inactive mode to the active mode may include operations, features, means, or instructions for receiving the wake-up signal in a first resource that may be different from a second resource configured for receiving second wake-up signals for triggering the transition from the inactive mode to the active mode for base station-UE communications.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the wake-up signal triggering the transition from the inactive mode to the active mode may include operations, features, means, or instructions for receiving the wake-up signal as a first sequence of a set of preconfigured sequences, where the first sequence may be different from a second sequence of the set of preconfigured sequences, the first sequence triggering the transition from the inactive mode to the active mode for the sidelink communications, and the second sequence triggering the transition from the inactive mode to the active mode for base station-UE communications.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying a selected active mode on duration during which the second UE may be to remain in the active mode, where the selected active mode on duration may be a longer of a first active mode on duration associated with a discontinuous reception cycle for base station-UE communications and a second active mode on duration associated with the sidelink communications and remaining in the active mode in accordance with the selected active mode on duration.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for switching a transceiver mode based on receiving the wake-up signal, where the transceiver mode includes at least a sidelink communications mode.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for activating a transceiver chain based on receiving the wake-up signal and maintaining the transceiver chain in an on state for a duration of the sidelink communication.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the identification of the second UE may be a layer1identifier, a layer2identifier, or a layer3identifier.

DETAILED DESCRIPTION

A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). In the wireless communications system, wireless communications between a UE and a base station may occur over a communication link, such as an access link (also referred to as a Uu interface). The wireless communications system may additionally, or alternatively, support sidelink communications between multiple communication devices. Examples of sidelink communications may include, but are not limited to, device-to-device (D2D) communications, vehicle-based communications, which may also be referred to as vehicle-to-everything (V2X) communications systems, vehicle-to-vehicle (V2V) communications systems, or cellular V2X (C-V2X) communications systems. Sidelink communications between UEs may occur over a communication link, such as a sidelink.

A UE may operate according to a power saving mode (also referred to as a discontinuous reception (DRX) mode) to preserve power by operating in an active state or an inactive state (also referred to as a sleep state) according to the DRX mode. In the active state, the UE may monitor a channel (e.g., a sidelink channel, an access link channel), transmit wireless communications (e.g., sidelink communication, access link communications), or receive wireless communications, among other examples, during an active duration (also referred to as an ON duration). In the inactive state (e.g., inactive mode, sleep mode), the UE may conserve power rather than monitoring the channel, transmitting the wireless communication, or receiving the wireless communication, among other examples, during an inactive duration (also referred to as an OFF duration).

The UE power saving mode (e.g., a DRX mode) may allow the UE to save battery power by sleeping during an inactive duration (also referred to as an OFF duration or a sleep duration) and waking up during an active duration (e.g., active mode). In some examples, a base station may determine to communicate with the UE in the inactive duration of the UE (e.g., while the UE is operating in the inactive mode).

In such examples, the base station may transmit a wake-up signal (WUS) (which may include a wake-up indicator) to the UE to prompt the UE to enter the active mode for receiving signaling (e.g., physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH)) from the base station. For example, the UE may decode the WUS and may further receive and decode PDCCH transmitted by the base station based on receiving the WUS. The UE may remain in the active mode for a period of time after receiving the WUS, where the period of time may restart based on receiving a second (or a third, a fourth, etc.) PDCCH.

In some examples, another UE may determine to communicate with the first UE while the first UE is in the inactive duration. Based on previous communications with the first UE during the active duration of the first UE, the second UE may have received a sidelink ID of the first UE. The second UE may transmit an uplink message including the sidelink ID of the first UE to the base station to trigger the base station to send a WUS to the first UE. The base station may receive the message including the sidelink ID of the first UE and may associate the sidelink ID of the first UE with an access link (e.g., Uu interface) ID of the first UE based on a configuration of the base station. For example, the base station may be configured with a mapping of sidelink IDs to Uu IDs or may be preconfigured with a set of sidelink IDs and Uu IDs among other examples. The base station may transmit the WUS to the first UE for transitioning the first UE from the inactive mode to the active mode based on receiving the uplink message from the second UE.

The first UE may receive, while in the inactive mode from the base station, the WUS for triggering a transition from the inactive mode to the active mode and may communicate with the second UE, the base station, or both, once the first UE has re-entered the active mode based on receiving the WUS while in the inactive mode. As such, the sidelink-induced WUS may provide mechanisms for the second UE to communicate with the first UE while in an inactive duration of the power saving mode.

The wireless communications system100may include a number of UEs115that are configured with a cyclic schedule (e.g., a DRX cycle) for conserving power at the UE115. For example, the cyclic schedule may specify periods when the UE115is to enter an inactive mode in which the UE115is configured to refrain from receiving (e.g., decoding) communications from other entities and may specify periods for the UE115to operate in the active mode in which the UE is configured to receive (e.g., decode) communications from other entities. In some examples, however, an entity, such as base station105, may determine to communicate with the UE115while the UE115is in the inactive mode according to the cyclic schedule.

In such examples, the base station105may transmit a WUS (which may include a wake-up indicator) to the UE115to prompt the UE115to enter the active mode for receiving signaling (e.g., PDCCH, PDSCH) from the base station105. For example, the UE115may decode the wake-up indicator and may further receive and decode PDCCH transmitted by the base station105based on receiving the WUS. The UE115may remain in the active mode for a period of time after receiving the WUS, where the period of time may restart based on receiving a second (a third, a fourth, etc.) PDCCH.

In some examples, the UEs115may additionally be configured for sidelink communications while operating according to the cyclic schedule. For example, a first UE115may determine to communicate with a second UE115that is in the inactive mode. Based on previous communications with the second UE115in the active mode, the first UE115may have received a sidelink ID of the second UE115. The first UE115may transmit an uplink message including the sidelink ID of the second UE115to the base station105to trigger the base station105to send a WUS to the second UE. The base station105may receive the message including the sidelink ID of the second UE115and may associate the sidelink ID of the second UE115with a Uu ID of the second UE115based on a configuration of the base station105. For example, the base station105may be configured with a mapping of sidelink IDs to Uu IDs or may be preconfigured with a set of sidelink IDs and Uu IDs among other examples. The base station105may transmit a WUS to the second UE115for transitioning the second UE115from the inactive mode to the active mode based on receiving the uplink message from the first UE115.

The second UE may receive, while in the inactive mode from the base station105, the WUS for triggering a transition from the inactive mode to the active mode and communicate with the first UE115once the second UE115has re-entered the active mode based on receiving the WUS while in the inactive mode. As such, the sidelink-induced WUS may provide mechanisms for the first UE115to communicate with the second UE115that is operating according to the cyclic schedule.

FIGS.2A and2Billustrates an example of a wireless communications system201and202respectively that each support sidelink-induced Uu WUS in accordance with aspects of the present disclosure.

With respect toFIG.2A, in some examples, wireless communications system201may implement aspects of wireless communications system100. For example, wireless communications system201may include UE115-a, UE115-b, UE115-c, UE115-d, and base station105-a, which may be examples of UEs115and base station105as described with reference toFIG.1. In some examples, base station105-a, UE115-a, UE115-b, UE115-c, and UE115-dmay transmit control signaling, data messages, or both using a direct communication link. For example, base station105-amay transmit signaling to UE115-a, UE115-b, UE115-c, UE115-dor any combination thereof via communication links125(e.g., communication link125-a, communication link125-b, communication link125-c, or communication link125-dwhere each may be an example of an access link for Uu communications) or vice versa. Similarly, in some cases, UE115-a, UE115-b, UE115-c, and UE115-dmay each communicate with another device via a sidelink communication link135(e.g., sidelink communication link135-a, sidelink communication link135-b, sidelink communication link135-c, or sidelink communication link135-d). For example, UE115-amay transmit control signaling or data messages to UE115-bvia sidelink communication link135-aor vice versa, UE115-bmay transmit control signaling or data messages to UE115-cvia sidelink communication link135-bor vice versa, and UE115-cmay transmit control signaling or data messages to UE115-dvia sidelink communication link135-cor vice versa.

Each of UE115-a, UE115-b, UE115-cand UE115-dmay be configured with a power saving mode such as a DRX cycle mode. In some examples, a DRX cycle may include a number of active durations for receiving and transmitting messages and a number of inactive durations for conserving power. The UE115-a, UE115-b, UE115-cand UE115-dmay wake-up for every active duration even when there are no communications to be received. To avoid unnecessary wake-ups, the base station105-amay transmit a WUS to indicate that there are communications to be received. The WUs may be transmitted over a narrow band (e.g., a frequency band including a small number of subcarriers) and may use less power to be decoded by the receiving entity (e.g., UE115-a, UE115-b, UE115-c, UE115-d, or any combination thereof). In such examples, the UE115-a, UE115-b, UE115-c, or UE115-dmay decode a subsequent PDCCH based on decoding a wake-up indicator (WI) received in a WUS. The UE115-a, UE115-b, UE115-c, or UE115-dmay perform PDSCH decoding based on decoding the PDCCH. Further, the UE115-a, UE115-b, UE115-c, or UE115-dmay remain in the active state for an amount of time (e.g., a preconfigured amount of time) following the successful reception of WUS (e.g., including decoding the WI) and may enter a deep sleep mode after the amount of time unless another PDCCH is received before the end of the active state amount of time. In some examples, there may be an timing offset between the end of a WUS transmission and the time PDCCH is transmitted by the base station105-ato allow time for the UE115-a, UE115-b, UE115-c, or UE115-dto perform post wake-up operations (e.g., based on transitioning from the sleep mode). In some examples, the WUS may include a primary synchronization signal, a secondary synchronization signal, or both.

In the example ofFIG.2A, each of the UE115-a, UE115-b, UE115-c, UE115-dmay be in a coverage area of the base station105-a. In some examples, a first subset of UE (e.g., UE115-a) may determine to perform sidelink communication with a second subset of UEs (e.g., UE115-b, UE115-c, or UE115-d, or any combination thereof). In some other examples, the base station105-amay determine that the first subset of UEs should perform sidelink communications with the second subset of UEs. One or more of the UE115-b, UE115-c, or UE115-dmay be configured with a DRX cycle for communications with the base station105-a(e.g., Uu DRX cycle) and thus, the base station105-amay be configured to wake-up the second subset of UEs for sidelink communications with the first subset of UEs.

For example, the UE115-amay determine to perform sidelink communication (e.g., unicast and/or groupcast communications) with one more of UE115-b, UE115-c, or UE115-d. In such examples, the UE115-amay have previously performed sidelink communications with the UE115-bvia sidelink communication link135-a(which may, for example, be an example of a PC5 communication link) and may have received or obtained a sidelink ID (e.g., sidelink layer1(L1)/layer2(L2)/layer3(L3) ID) associated with the UE115-b. Additionally, or alternatively the UE115-amay receive sidelink IDs associated with UE115-cor UE115-dor both via communications with the UE115-bor via previous sidelink communications performed on sidelink communication links (e.g., PC5 links) between the UE115-aand the UE115-c(not shown) or the UE115-aand the UE115-d(not shown) or both. For example, the UE115-bmay have performed sidelink communications with the UE115-cand may have obtained the sidelink ID of the UE115-cvia sidelink communication link135-b(which may be an example of a PC5 communication link) and may transmit the sidelink ID of the UE115-cto the UE115-avia the sidelink communication link135-a. In some examples, the previous sidelink communications may include an indication of the DRX cycles of the UE115-b, UE115-c, or UE115-d, or any combination thereof, that are configured by the base station105-a.

The UE115-amay determine with which of the UE115-b, UE115-c, or the UE115-dto communicate and may transmit the corresponding sidelink IDs to the base station105-avia communication link125-a. The base station105-amay associate the sidelink IDs of the UE115-b, UE115-c, or UE115-d(e.g., those with which the UE115-aintends to perform sidelink communications) with a corresponding access link ID (e.g., Uu ID). In some examples, the access link IDs may correspond to the cell radio network temporary ID (CRNTI) of the UE115-b, UE115-c, or UE115-drespectively.

The base station105-amay wake up UE115-b, UE115-c, or UE115-dby transmitting a WUS to one or more of the UE115-b, UE115-c, or UE115-dover the communication links125-b,125-c, or125-drespectively. However, The UE115-b, UE115-c, or UE115-dmay perform different actions based on whether the WUS is for access link communications or sidelink communications and thus the base station may differentiate an access link WUS (e.g., a WUS transmitted over an access link for communicating with the base station over a communication link125) from a sidelink-induced access link WUS (e.g., a WUS transmitted over an access link for communicating with the UE115-aover a communication link135). For example, the base station105-amay transmit a sidelink-induced access link wakeup signal over a first set of frequency resources (e.g., that may or may not be UE specific, that may or may not be preconfigured) in a first set of time resources (e.g., one or more occasions, slots, mini-slots), while transmitting the access link WUS over a second set of frequency resources in the first set of time resources first or on a set of time resources. In some examples, the base station105-amay transmit the sidelink-induced access link WUS using a first sequence (e.g., Zadoff Chu) over a first set of resources, while transmitting the access link WUS using a second sequence over the first or a different set of resources. Additionally, or alternatively, the base station105-amay transmit a third sequence on the first or different set of resources to prompt both sidelink-induced access link wakeup for communications with the UE115-aas well as access link wakeup for communications with the base station105-a. The sets of frequency resources, the sets of time resources, the sets of resources and the different sequences (e.g., the first second and third sequence) may be configured statically, or semi-statically by higher layer signaling (e.g., RRC signaling).

In some examples, the different sequences may, additionally or alternatively correspond different sets of time and frequency resources in which the recipient is to remain in the active mode and perform subsequent sidelink communications. For example, the base station105-amay transmit a first sequence that may indicate that the UE115-b, UE115-c, or the UE115-dis to be awake for potentially performing sidelink communication for N1slots over a set of resources R1, while a second sequence may indicate that the UE115-b, UE115-c, or the UE115-dis to be awake for potentially performing sidelink communication for N2slots and/or over a second set of resources R2.

In some examples, the control information payload (e.g., PDCCH payload) subsequent to the WUS may indicate whether the indicated wake-up is for access link, or sidelink or both. For example, the control information payload may indicate specific resource pools to be monitored by the UE115-b, UE115-c, or UE115-d. In some examples, the control information payload may include other parameters of the wake-up (e.g., the number of slots). For example, a specific control information payload may be used to monitor specific resource-pool(s).

In some examples, the base station105-amay transmit a group sidelink induced access link WUS for waking up the UE115-b, UE115-c, or the UE115-dconcurrently (e.g., for sidelink communications only) or may transmit a UE-specific sidelink induced access link WUS to one or more of the UE115-b, UE115-c, or the UE115-bfor prompting a wakeup. The UE115-amay confirm that one or more of the UE115-b, UE115-c, or the UE115-d(e.g., those that have been identified for performing sidelink communications) are woken up.

Based on receiving the sidelink-induced access link WUS, the receiving UE (e.g., any of UE115-b, UE115-c, or UE115-d, but for the sake of clarity in this example, UE115-b) may perform a correlation of the sequence received in a first set of resources with the first sequence (e.g., which may indicate sidelink-induced access link wakeup) and/or may perform a correlation of a sequence received on the first or different set of resources with a second preconfigured sequence (e.g., indicating access link wakeup), and/or may perform a correlation of a sequence received on the first or different set of resources with a third preconfigured sequence (e.g., indicating both access link wakeup and sidelink-induced access link).

The UE115-bmay detect the presence of the first sequence (e.g., associated with wake-up for sidelink communications) and may activate (e.g., switch, turn on) a transceiver chain corresponding to uplink communications during the active period (e.g., duration) for subsequent sidelink communications. The length of the active duration may depend on the transmitted sequence. The UE115-bmay detect the presence of the second sequence (e.g., associated with wake-up for access link communications) or the third sequence (e.g., associated with both access link and sidelink communications) and may activate (e.g., switch, turn on) one or more transceiver chains corresponding to uplink communications and downlink communications during the active period (e.g., duration) for subsequent communications. In some examples, the UE115-bdetects the presence of both the first and second sequence. In such examples, the length of the active duration is the larger of the length of the active duration associated with access link DRX, and the length of the active duration associated with sidelink DRX.

In some examples, the base station105-amay transmit UE-specific or group WUS based on receiving a sidelink scheduling request or buffer status report from the UE115-a. For example, the sidelink IDs reported to the base station105-aby the UE115-amay be included in the buffer status report. In some examples, the UE115-adetermines to initiate sidelink communications with one or more of the UE115-b, UE115-c, or UE115-dand may transmit a scheduling request/buffer status report to the base station105-a. The buffer status report may include the SL IDs of the UE115-b, UE115-c, or UE115-d. Upon receiving the scheduling request/buffer status report from the UE115-a, the base station105-amay map the SL IDs to the corresponding access link IDs. The base statin105-amay transmit a UE-specific sidelink-induced WUS or group sidelink-induced WUS as described herein.

In some other examples, the UE115-amay transmit a buffer status report from including the sidelink IDs from which the base station105-amay determine that the buffer of the UE115-ais greater than a threshold. The base station105-amay transmit one or more WUS to the UE115-b, UE115-c, and the UE115-dto prompt the UE115-b, UE115-c, and the UE115-dto enter the active mode such that the UE115-amay offload the buffered data.

With respect toFIG.2B, in some examples, wireless communications system202may implement aspects of wireless communications system100and/or wireless communications system201. For example, wireless communications system202may include UE115-e, UE115-f, UE115-g, UE115-h, as well as base station105-band base station105-c, which may be examples of UEs115and base station105as described with reference toFIG.1. In some examples, UE115-eand UE115-fmay be in a coverage area110-aof base station105-band UE115-gand UE115-hmay be in a coverage area110-bor base station105-c, each of which may transmit control signaling, data messages, or both using a direct communication link. For example, base station105-bmay transmit signaling to UE115-eand UE115-fvia communication links125(e.g., communication link125-eand communication link125-f) or vice versa, and base station105-cmay transmit signaling to UE115-gand UE115-hvia communication links125(e.g., communication link125-gand communication link125-h) or vice versa. Similarly, in some cases, UE115-e, UE115-f, UE115-g, and UE115-hmay each communicate with another device via a sidelink communication link135(e.g., sidelink communication link135-dand sidelink communication link135-e). For example, UE115-emay transmit control signaling or data messages to UE115-hvia sidelink communication link135-eor vice versa, and UE115-fmay transmit control signaling or data messages to UE115-gvia sidelink communication link135-dor vice versa. Additionally, or alternatively base station105-bmay transmit signaling (e.g., X2 signaling) to base station105-cvia backhaul link120-a.

In some examples, a first subset of UE (e.g., UE115-e) may determine to perform sidelink communication with a second subset of UEs (e.g., UE115-f, UE115-g, or UE115-h, or any combination thereof). In some other examples, the base station105-amay determine that the first subset of UEs should perform sidelink communications with the second subset of UEs. One or more of the UE115-f, UE115-g, or UE115-hmay be configured with a DRX cycle for communications with the base station105-a(e.g., Uu DRX cycle) and thus, the base stations105-aand105-bmay be configured to wake-up the UEs of second subset of UEs that are in the corresponding coverage area for sidelink communications with the first subset of UEs.

For example, the UE115-emay determine to perform sidelink communication (e.g., unicast and/or groupcast communications) with one more of UE115-f, UE115-g, or UE115-h. In such examples, the UE115-emay have previously performed sidelink communications with the UE115-hvia sidelink communication link135-e(which may, for example, be an example of a PC5 communication link) and may have received or obtained a sidelink ID (e.g., sidelink layer1(L1)/layer2(L2)/layer3(L3) ID) associated with the UE115-h.

In the example, ofFIG.2B, the UE115-ein coverage area110-amay determine to communicate with UE115-hin the coverage area110-b. That is UE115-emay be served by base station105-band UE115-hmay be served by base station105-c. The UE115-emay transmit the sidelink ID of UE115-hto the base station105-bvia communication link125-e. The base station105-amay associate the sidelink ID of the UE115-hwith a corresponding access link ID (e.g., Uu ID). However, the base station105-bmay determine that the UE115-his connected to (e.g., served by) the base station105-cand may not be configured to transmit a WUS to the UE115-h. In such examples, the base station105-bmay transmit X2 signaling to the base station105-cvia backhaul link120-awhich may request that the base station105-ctransmit a sidelink-induced WUS to the UE115-h. Other aspects of the communications between the UE115-e, UE115-f, UE115-g, or the UE115-h, base station105-band base station105-cmay be performed similarly to those described with reference toFIG.2A.

FIG.3illustrates an example of a WUS timing configuration300that supports sidelink-induced Uu WUS in accordance with aspects of the present disclosure. In some examples, WUS timing configuration300may implement aspects of wireless communications system100and wireless communications system200. WUS timing configuration300may illustrate an example timing of sequences transmitted by a base station (e.g., base station105) to prompt wake-up at a UE (e.g., UE115) operating according to a DRX cycle.

In a first example305, a UE may be operating according to a sleep mode and may receive a WUS during Uu WUS Occasion315. Based on receiving the WUS during the Uu WUS Occasion315the UE may determine to enter an active mode for access link communications with a base station for a duration of time. Additionally, or alternatively, the UE may receive a second WUS during sidelink WUS Occasion1320which may be associated with a first active duration330. That is, a WUS indicator received during sidelink WUS Occasion1320may indicate that the UE is to enter the active mode for a first duration of time330. Based on receiving the WUS during the sidelink WUS Occasion1320, the UE may determine to enter an active mode for sidelink communications with another UE for the first duration of time330and may reenter the sleep mode after the first duration of time330.

In a second example310, the UE may be operating according to a sleep mode and may receive a WUS during Uu WUS Occasion315. Based on receiving the WUs during the Uu WUS Occasion315the UE may determine to enter an active mode for access link communications with a base station for a duration. Additionally, or alternatively, the UE may receive a second WUS during sidelink WUS Occasion2325which may be associated with a second active duration335. That is, a WUS indicator received during sidelink WUS Occasion2325may indicate that the UE is to enter the active mode for a second duration of time335. Based on receiving the WUS during the sidelink WUS Occasion2325, the UE may determine to enter the active mode for sidelink communications with another UE for the second duration of time335and may reenter the sleep mode after the second duration of time335.

FIG.4illustrates an example of a process flow400that supports sidelink-induced Uu WUS in accordance with aspects of the present disclosure. In some examples, process flow400may implement aspects of wireless communications system100, wireless communications system200, and WUS timing configuration300. The process flow400may include UE115-I, UE115-j, and UE115-kas well as base station105-d. Alternative examples of the following may be implemented, where some processes are performed in a different order than described or are not performed or are perform by different entities. In some cases, processes may include additional features not explicitly detailed below, or further processes may be added.

At405, the UE115-iin a coverage area of the base station105-dmay transmit a sidelink communication to the UE115-k. In some examples, the UE115-imay transmit the sidelink communication while in an active duration of a power saving mode (e.g., DRX mode) of the UE115-i. The sidelink communication may include a sidelink ID of the UE115-i. At410, the UE115-imay enter an inactive mode after the active mode duration expires, for example, or based on one or more configurations of the power savings mode of the UE115-i. At415, the UE115-jin the coverage area of the base station105-dmay transmit a sidelink communication to the UE115-k. In some examples, the UE115-jmay transmit the sidelink communication while in an active duration of a power saving mode (e.g., DRX mode) of the UE115-j. The sidelink communication may include a sidelink ID of the UE115-j. At420, the UE115-jmay enter an inactive mode after the active mode duration expires, for example, or based on one or more configurations of the power savings mode of the UE115-j.

At425, the UE115-kmay determine to communicate with one or more of the UE115-iand the UE115-j. For example, the UE115-kmay determine to perform a unicast communications with UE115-i, or UE115-j, or both, or may determine to perform groupcast communications with the UE115-iand the UE115-j. Based on receiving the sidelink communications from UE115-iat405and the sidelink communications from UE115-jat415, the UE115-kmay obtain the sidelink IDs of the UEs with which it has determined to communicate. For example, the UE115-kmay receive the sidelink L1, or L2, or L3, ID of the UE115-iat405and may receive the sidelink L1, or L2, or L3, ID of the UE115-jat415.

At430, based on determining to communicate with one or more of the UE115-iand the UE115-j, the UE115-kmay transmit an uplink message to the base station105-d. For example, the UE115-kmay indicate with which UEs the UE115-khas determined to communicate by including the corresponding sidelink IDs in the uplink communication to the base station105-d.

At435, the base station may associate the received sidelink IDs of the UE115-i, the UE115-j, or both, with a corresponding access link ID (e.g., Uu ID) of the UE115-i, the UE115-j, or both. In some examples, the access link IDs of the UE115-i, the UE115-j, or both may correspond to the CRNTI of the UE115-i, the UE115-j, or both.

At440,450, or460, the base station105-dmay transmit a sidelink-induced access link WUS for communications with the UE115-kin a first set of resources (e.g., that may or may not be UE-specific, or preconfigured, or both) on a first set of time resources (e.g., occasion, slot, mini-slot), while transmitting an access link WUS (e.g., default Uu WUS) for communications with the base station105-din a second set of resources on the first set of time resources or on a different set of time resources.

In some examples, the base station105-dmay transmit the sidelink-induced access link WUS using a first sequence (e.g., Zadoff Chu) on a first set of time resources and may transmit the access link WUS (e.g., default Uu WUS) using a second sequence on the first set of time resources or a different set of time resources. In some examples, the base station105-dmay transmit a third sequence on the first set of time resources or the different set of time resources to indicate both sidelink-induced access link wake-up as well as the access link wake-up (e.g., default Uu wake-up).

In some examples, the base station105-dmay transmit different sequences to indicate to the indicated UEs to wake up for a different number of time or frequency resources, or both to perform subsequent sidelink communications. For example, the first sequence may correspond to a first set of time resources and a first set of frequency resources for performing communications in the active duration, while the second sequence may correspond to a second set of time resources and a second set of frequency resources for performing communications in the active duration.

For example, at440, the base station105may transmit a first UE-specific WUS, which may be an example of any of the WUS described herein, to the UE115-iwhich may enter the active mode at445. For example, the UE115-imay receive the WUS and determine whether the WUS is for sidelink communications or access link communications, or both based on the WUS configuration. Based on the WUS configuration, the UE115-imay determine to activate a set of communication components corresponding to the communications to be performed. For example, if the WUS indicates the UE115-iis to wake up for sidelink communications, the UE115-imay activate the corresponding uplink components and if the WUS indicates the UE115-iis to wake up for sidelink communications and access link communications the UE115-imay activate the corresponding uplink components and may activate the corresponding downlink components. Additionally, or alternatively, the WUS-induced active duration may depend on the WUS configuration. For example, if the WUS indicates the UE115-iis to wake up for sidelink communications, the active duration may correspond to a first duration and if the WUS indicates the UE115-iis to wake up for sidelink communications and access link communications the active duration may correspond to a second duration. In some examples, the WUS configuration may indicates whether wake-up is for access link communications, or sidelink communications, or both. For example, the WUS may indicate a set of resource pools to be monitored by the receiving UE. The WUS may additionally or alternatively include other parameters of the wake-up (e.g., a number of slots). In some examples, a specific WUS could indicate one or more specific resource-pools to be monitored.

For example, at450, the base station105may transmit a second UE-specific WUS, which may be an example of any of the WUS described herein, to the UE115-jwhich may enter the active mode at455. For example, the UE115-jmay receive the WUS and determine whether the WUS is for sidelink communications or access link communications, or both based on the WUS configuration. Based on the WUS configuration, the UE115-jmay determine to activate a set of communication components corresponding to the communications to be performed. For example, if the WUS indicates the UE115-jis to wake up for sidelink communications, the UE115-jmay activate the corresponding uplink components and if the WUS indicates the UE115-jis to wake up for sidelink communications and access link communications the UE115-jmay activate the corresponding uplink components and may activate the corresponding downlink components. Additionally, or alternatively, the WUS-induced active duration may depend on the WUS configuration. For example, if the WUS indicates the UE115-jis to wake up for sidelink communications, the active duration may correspond to a first duration and if the WUS indicates the UE115-jis to wake up for sidelink communications and access link communications the active duration may correspond to a second duration.

At460, the base station105may transmit a group WUS, which may be an example of any of the WUS described herein, to the UE115-iand the UE115-jwhich may each enter the active mode at465and470concurrently. For example, the UE115-iand the UE115-jmay perform actions similar to those described with reference to the actions performed at445and/or455based on receiving the group WUS.

Each of the UE115-i, the UE115-j, may perform communications with the UE115-kor the base station105-d, or both while in the active duration.

The communications manager520, the receiver510, the transmitter515, or various combinations thereof or various components thereof may be examples of means for performing various aspects of sidelink-induced Uu WUS as described herein. For example, the communications manager520, the receiver510, the transmitter515, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

The communications manager520may support wireless communication at a base station in accordance with examples as disclosed herein. For example, the communications manager520may be configured as or otherwise support a means for receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The communications manager520may be configured as or otherwise support a means for associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The communications manager520may be configured as or otherwise support a means for transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

By including or configuring the communications manager520in accordance with examples as described herein, the device505(e.g., a processor controlling or otherwise coupled to the receiver510, the transmitter515, the communications manager520, or a combination thereof) may support techniques for reduced power consumption and reduced processing.

The device605, or various components thereof, may be an example of means for performing various aspects of sidelink-induced Uu WUS as described herein. For example, the communications manager620may include an uplink (UL) indication component625, an ID component630, a WUS transmitter635, or any combination thereof. The communications manager620may be an example of aspects of a communications manager520as described herein. In some examples, the communications manager620, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver610, the transmitter615, or both. For example, the communications manager620may receive information from the receiver610, send information to the transmitter615, or be integrated in combination with the receiver610, the transmitter615, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager620may support wireless communication at a base station in accordance with examples as disclosed herein. The UL indication component625may be configured as or otherwise support a means for receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The ID component630may be configured as or otherwise support a means for associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The WUS transmitter635may be configured as or otherwise support a means for transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

FIG.7shows a block diagram700of a communications manager720that supports sidelink-induced Uu WUS in accordance with aspects of the present disclosure. The communications manager720may be an example of aspects of a communications manager520, a communications manager620, or both, as described herein. The communications manager720, or various components thereof, may be an example of means for performing various aspects of sidelink-induced Uu WUS as described herein. For example, the communications manager720may include an UL indication component725, an ID component730, a WUS transmitter735, a WUS indication/resource manager740, a connection manager745, a WUS assistance component750, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager720may support wireless communication at a base station in accordance with examples as disclosed herein. The UL indication component725may be configured as or otherwise support a means for receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The ID component730may be configured as or otherwise support a means for associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The WUS transmitter735may be configured as or otherwise support a means for transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

In some examples, to support transmitting the one or more signals, the WUS transmitter735may be configured as or otherwise support a means for transmitting the one or more signals using a first set of resources that is different from a second set of resources used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications.

In some examples, to support transmitting the one or more signals, the WUS transmitter735may be configured as or otherwise support a means for transmitting the one or more signals using a first sequence that is different from a second sequence used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications.

In some examples, to support transmitting the one or more signals, the WUS transmitter735may be configured as or otherwise support a means for transmitting the one or more signals using a sequence that is indicative of a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for both the sidelink communications and base station-UE communications.

In some examples, the WUS indication/resource manager740may be configured as or otherwise support a means for transmitting radio resource control signaling in order to configure the set of one or more UEs with resources or sequences to be used in the transmitting of the one or more signals, where the resources or sequences are different from wake-up resources or sequences used for base station-UE communications.

In some examples, to support transmitting the one or more signals, the WUS transmitter735may be configured as or otherwise support a means for transmitting the one or more signals as wake-up signals that include first payloads that indicate that the wake-up signals are for transitioning each of the set of one or more UEs from the inactive mode to the active mode for the sidelink communications during a first duration of time, where the first payloads are different from second payloads that indicate that the wake-up signals are for transitioning each of the set of one or more UEs for base station-UE communications or for both the sidelink communications and the base station-UE communications during a second duration of time.

In some examples, to support transmitting the one or more signals, the WUS transmitter735may be configured as or otherwise support a means for transmitting the one or more signals as wake-up signals that include an indication of a first pool of resources for the set of one or more UEs to monitor for sidelink communications after transitioning from the inactive mode to the active mode, where the first pool of resources is different from a second pool of resources configured for base station-UE communications.

In some examples, to support transmitting the one or more signals, the WUS transmitter735may be configured as or otherwise support a means for transmitting a group wake-up signal to each of the set of one or more UEs.

In some examples, the connection manager745may be configured as or otherwise support a means for determining that at least one UE of the set of one or more UEs is connected to a second base station. In some examples, the WUS assistance component750may be configured as or otherwise support a means for transmitting, to the second base station, a message that includes a sidelink communication identification of the at least one UE to trigger the second base station to transmit a wake-up signal to the at least one UE.

In some examples, the message is transmitted via an X2 interface.

In some examples, to support receiving the uplink message, the UL indication component725may be configured as or otherwise support a means for receiving either a scheduling request or a buffer status report as the uplink message.

In some examples, the one or more sidelink communication identifications include layer1identifiers, layer2identifiers, or layer3identifiers and the set of second identifications includes a set of Uu interface identifiers.

In some examples, the set of Uu interface identifiers includes a set of cell radio network temporary identifiers.

FIG.8shows a diagram of a system800including a device805that supports sidelink-induced Uu WUS in accordance with aspects of the present disclosure. The device805may be an example of or include the components of a device505, a device605, or a base station105as described herein. The device805may communicate wirelessly with one or more base stations105, UEs115, or any combination thereof. The device805may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager820, a network communications manager810, a transceiver815, an antenna825, a memory830, code835, a processor840, and an inter-station communications manager845. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus850).

The inter-station communications manager845may manage communications with other base stations105and may include a controller or scheduler for controlling communications with UEs115in cooperation with other base stations105. For example, the inter-station communications manager845may coordinate scheduling for transmissions to UEs115for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager845may provide an X2 interface within an LTE/LTE-A wireless communications network technology to provide communication between base stations105.

The communications manager820may support wireless communication at a base station in accordance with examples as disclosed herein. For example, the communications manager820may be configured as or otherwise support a means for receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The communications manager820may be configured as or otherwise support a means for associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The communications manager820may be configured as or otherwise support a means for transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

By including or configuring the communications manager820in accordance with examples as described herein, the device805may support techniques for reduced power consumption, improved user experience related to reduced processing, more efficient utilization of communication resources, improved coordination between devices, longer battery life, and improved utilization of processing capability.

The communications manager920, the receiver910, the transmitter915, or various combinations thereof or various components thereof may be examples of means for performing various aspects of sidelink-induced Uu WUS as described herein. For example, the communications manager920, the receiver910, the transmitter915, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

The communications manager920may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager920may be configured as or otherwise support a means for receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE. The communications manager920may be configured as or otherwise support a means for determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode. The communications manager920may be configured as or otherwise support a means for transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE. The communications manager920may be configured as or otherwise support a means for communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

Additionally, or alternatively, the communications manager920may support wireless communication at a second UE in accordance with examples as disclosed herein. For example, the communications manager920may be configured as or otherwise support a means for transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE. The communications manager920may be configured as or otherwise support a means for receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message. The communications manager920may be configured as or otherwise support a means for communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

By including or configuring the communications manager920in accordance with examples as described herein, the device905(e.g., a processor controlling or otherwise coupled to the receiver910, the transmitter915, the communications manager920, or a combination thereof) may support techniques for reduced power consumption and reduced processing.

The device1005, or various components thereof, may be an example of means for performing various aspects of sidelink-induced Uu WUS as described herein. For example, the communications manager1020may include a sidelink communications component1025a WUS component1030, or any combination thereof. The communications manager1020may be an example of aspects of a communications manager920as described herein. In some examples, the communications manager1020, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver1010, the transmitter1015, or both. For example, the communications manager1020may receive information from the receiver1010, send information to the transmitter1015, or be integrated in combination with the receiver1010, the transmitter1015, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager1020may support wireless communication at a first UE in accordance with examples as disclosed herein. The sidelink communications component1025may be configured as or otherwise support a means for receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE. The sidelink communications component1025may be configured as or otherwise support a means for determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode. The WUS component1030may be configured as or otherwise support a means for transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE. The sidelink communications component1025may be configured as or otherwise support a means for communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

Additionally, or alternatively, the communications manager1020may support wireless communication at a second UE in accordance with examples as disclosed herein. The sidelink communications component1025may be configured as or otherwise support a means for transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE. The WUS component1030may be configured as or otherwise support a means for receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message. The sidelink communications component1025may be configured as or otherwise support a means for communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

FIG.11shows a block diagram1100of a communications manager1120that supports sidelink-induced Uu WUS in accordance with aspects of the present disclosure. The communications manager1120may be an example of aspects of a communications manager920, a communications manager1020, or both, as described herein. The communications manager1120, or various components thereof, may be an example of means for performing various aspects of sidelink-induced Uu WUS as described herein. For example, the communications manager1120may include a sidelink communications component1125, a WUS component1130, an ID component1135, an active mode component1140, a communication mode manager1145, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager1120may support wireless communication at a first UE in accordance with examples as disclosed herein. The sidelink communications component1125may be configured as or otherwise support a means for receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE. In some examples, the sidelink communications component1125may be configured as or otherwise support a means for determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode. The WUS component1130may be configured as or otherwise support a means for transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE. In some examples, the sidelink communications component1125may be configured as or otherwise support a means for communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

In some examples, to support transmitting the uplink message, the ID component1135may be configured as or otherwise support a means for transmitting, in the uplink message, multiple identifications of multiple UEs with which the first UE is to communicate via sidelink communications, the second UE being one of the multiple UEs.

In some examples, to support transmitting the uplink message, the WUS component1130may be configured as or otherwise support a means for transmitting a scheduling request or a buffer status report as the uplink message.

In some examples, to support receiving the sidelink message, the sidelink communications component1125may be configured as or otherwise support a means for receiving an indication of a discontinuous reception cycle associated with communications at the second UE.

In some examples, the sidelink communications include groupcast or unicast communications.

In some examples, the identification of the second UE is one of a layer1identifier, a layer2identifier, a layer3identifier.

Additionally, or alternatively, the communications manager1120may support wireless communication at a second UE in accordance with examples as disclosed herein. In some examples, the sidelink communications component1125may be configured as or otherwise support a means for transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE. In some examples, the WUS component1130may be configured as or otherwise support a means for receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message. In some examples, the sidelink communications component1125may be configured as or otherwise support a means for communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

In some examples, to support receiving the wake-up signal triggering the transition from the inactive mode to the active mode, the WUS component1130may be configured as or otherwise support a means for receiving the wake-up signal in a first resource that is different from a second resource configured for receiving second wake-up signals for triggering the transition from the inactive mode to the active mode for base station-UE communications.

In some examples, to support receiving the wake-up signal triggering the transition from the inactive mode to the active mode, the WUS component1130may be configured as or otherwise support a means for receiving the wake-up signal as a first sequence of a set of preconfigured sequences, where the first sequence is different from a second sequence of the set of preconfigured sequences, the first sequence triggering the transition from the inactive mode to the active mode for the sidelink communications, and the second sequence triggering the transition from the inactive mode to the active mode for base station-UE communications.

In some examples, the active mode component1140may be configured as or otherwise support a means for identifying a selected active mode on duration during which the second UE is to remain in the active mode, where the selected active mode on duration is a longer of a first active mode on duration associated with a discontinuous reception cycle for base station-UE communications and a second active mode on duration associated with the sidelink communications. In some examples, the active mode component1140may be configured as or otherwise support a means for remaining in the active mode in accordance with the selected active mode on duration.

In some examples, the communication mode manager1145may be configured as or otherwise support a means for switching a transceiver mode based on receiving the wake-up signal, where the transceiver mode includes at least a sidelink communications mode.

In some examples, the communication mode manager1145may be configured as or otherwise support a means for activating a transceiver chain based on receiving the wake-up signal. In some examples, the communication mode manager1145may be configured as or otherwise support a means for maintaining the transceiver chain in an on state for a duration of the sidelink communication.

In some examples, the identification of the second UE is a layer1identifier, a layer2identifier, or a layer3identifier.

The I/O controller1210may manage input and output signals for the device1205. The I/O controller1210may also manage peripherals not integrated into the device1205. In some cases, the I/O controller1210may represent a physical connection or port to an external peripheral. In some cases, the I/O controller1210may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. Additionally, or alternatively, the I/O controller1210may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller1210may be implemented as part of a processor, such as the processor1240. In some cases, a user may interact with the device1205via the I/O controller1210or via hardware components controlled by the I/O controller1210.

The communications manager1220may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1220may be configured as or otherwise support a means for receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE. The communications manager1220may be configured as or otherwise support a means for determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode. The communications manager1220may be configured as or otherwise support a means for transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE. The communications manager1220may be configured as or otherwise support a means for communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

Additionally, or alternatively, the communications manager1220may support wireless communication at a second UE in accordance with examples as disclosed herein. For example, the communications manager1220may be configured as or otherwise support a means for transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE. The communications manager1220may be configured as or otherwise support a means for receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message. The communications manager1220may be configured as or otherwise support a means for communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode.

By including or configuring the communications manager1220in accordance with examples as described herein, the device1205may support techniques for reduced power consumption, improved user experience related to reduced processing, more efficient utilization of communication resources, improved coordination between devices, longer battery life, and improved utilization of processing capability.

At1305, the method may include receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The operations of1305may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1305may be performed by an UL indication component725as described with reference toFIG.7.

At1310, the method may include associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The operations of1310may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1310may be performed by an ID component730as described with reference toFIG.7.

At1315, the method may include transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications. The operations of1315may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1315may be performed by a WUS transmitter735as described with reference toFIG.7.

At1405, the method may include receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The operations of1405may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1405may be performed by an UL indication component725as described with reference toFIG.7.

At1410, the method may include associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The operations of1410may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1410may be performed by an ID component730as described with reference toFIG.7.

At1415, the method may include transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications. The operations of1415may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1415may be performed by a WUS transmitter735as described with reference toFIG.7.

At1420, the method may include transmitting the one or more signals using a first set of resources that is different from a second set of resources used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications. The operations of1420may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1420may be performed by a WUS transmitter735as described with reference toFIG.7.

At1505, the method may include receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The operations of1505may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1505may be performed by an UL indication component725as described with reference toFIG.7.

At1510, the method may include associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The operations of1510may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1510may be performed by an ID component730as described with reference toFIG.7.

At1515, the method may include transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications. The operations of1515may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1515may be performed by a WUS transmitter735as described with reference toFIG.7.

At1520, the method may include transmitting the one or more signals using a first sequence that is different from a second sequence used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications. The operations of1520may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1520may be performed by a WUS transmitter735as described with reference toFIG.7.

At1605, the method may include receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs. The operations of1605may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1605may be performed by an UL indication component725as described with reference toFIG.7.

At1610, the method may include associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs. The operations of1610may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1610may be performed by an ID component730as described with reference toFIG.7.

At1615, the method may include transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications. The operations of1615may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1615may be performed by a WUS transmitter735as described with reference toFIG.7.

At1620, the method may include transmitting the one or more signals using a sequence that is indicative of a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for both the sidelink communications and base station-UE communications. The operations of1620may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1620may be performed by a WUS transmitter735as described with reference toFIG.7.

At1705, the method may include receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE. The operations of1705may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1705may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1710, the method may include determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode. The operations of1710may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1710may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1715, the method may include transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE. The operations of1715may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1715may be performed by a WUS component1130as described with reference toFIG.11.

At1720, the method may include communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message. The operations of1720may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1720may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1805, the method may include receiving, from a second UE that is in an active mode, a sidelink message that includes an identification of the second UE. The operations of1805may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1805may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1810, the method may include determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode. The operations of1810may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1810may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1815, the method may include transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message including the identification of the second UE. The operations of1815may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1815may be performed by a WUS component1130as described with reference toFIG.11.

At1820, the method may include transmitting, in the uplink message, multiple identifications of multiple UEs with which the first UE is to communicate via sidelink communications, the second UE being one of the multiple UEs. The operations of1820may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1820may be performed by an ID component1135as described with reference toFIG.11.

At1825, the method may include communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message. The operations of1825may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1825may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1905, the method may include transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE. The operations of1905may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1905may be performed by a sidelink communications component1125as described with reference toFIG.11.

At1910, the method may include receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message. The operations of1910may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1910may be performed by a WUS component1130as described with reference toFIG.11.

At1915, the method may include communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode. The operations of1915may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1915may be performed by a sidelink communications component1125as described with reference toFIG.11.

At2005, the method may include transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE. The operations of2005may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2005may be performed by a sidelink communications component1125as described with reference toFIG.11.

At2010, the method may include receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based on transmitting the sidelink message. The operations of2010may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2010may be performed by a WUS component1130as described with reference toFIG.11.

At2015, the method may include receiving the wake-up signal in a first resource that is different from a second resource configured for receiving second wake-up signals for triggering the transition from the inactive mode to the active mode for base station-UE communications. The operations of2015may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2015may be performed by a WUS component1130as described with reference toFIG.11.

At2020, the method may include communicating with the first UE once the second UE has re-entered the active mode based on receiving the wake-up signal while in the inactive mode. The operations of2020may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2020may be performed by a sidelink communications component1125as described with reference toFIG.11.

Aspect 1: A method for wireless communication at a base station, comprising: receiving, from a first UE, an uplink message that includes a set of one or more sidelink communication identifications each associated with a different UE of a set of one or more UEs; associating, based on receiving the uplink message from the first UE, each of the set of one or more sidelink communication identifications with a corresponding second identification of a set of second identifications, each of the set of second identifications also associated with each of the set of one or more UEs; and transmitting one or more signals for transitioning each of the set of one or more UEs associated with the set of second identifications from an inactive mode to an active mode based at least in part on associating each of the set of one or more sidelink communication identifications with the second identification of the set of second identifications.

Aspect 2: The method of aspect 1, wherein transmitting the one or more signals further comprises: transmitting the one or more signals using a first set of resources that is different from a second set of resources used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications.

Aspect 3: The method of any of aspects 1 through 2, wherein transmitting the one or more signals comprises: transmitting the one or more signals using a first sequence that is different from a second sequence used to transmit a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for base station-UE communications.

Aspect 4: The method of any of aspects 1 through 3, wherein transmitting the one or more signals comprises: transmitting the one or more signals using a sequence that is indicative of a wake-up signal for transitioning each of the set of one or more UEs from the inactive mode to the active mode for both the sidelink communications and base station-UE communications.

Aspect 5: The method of any of aspects 1 through 4, further comprising: transmitting radio resource control signaling in order to configure the set of one or more UEs with resources or sequences to be used in the transmitting of the one or more signals, wherein the resources or sequences are different from wake-up resources or sequences used for base station-UE communications.

Aspect 6: The method of any of aspects 1 through 5, wherein transmitting the one or more signals comprises: transmitting the one or more signals as wake-up signals that include first payloads that indicate that the wake-up signals are for transitioning each of the set of one or more UEs from the inactive mode to the active mode for the sidelink communications during a first duration of time, wherein the first payloads are different from second payloads that indicate that the wake-up signals are for transitioning each of the set of one or more UEs for base station-UE communications or for both the sidelink communications and the base station-UE communications during a second duration of time.

Aspect 7: The method of any of aspects 1 through 6, wherein transmitting the one or more signals comprises: transmitting the one or more signals as wake-up signals that include an indication of a first pool of resources for the set of one or more UEs to monitor for sidelink communications after transitioning from the inactive mode to the active mode, wherein the first pool of resources is different from a second pool of resources configured for base station-UE communications.

Aspect 8: The method of any of aspects 1 through 7, wherein transmitting the one or more signals comprises: transmitting a group wake-up signal to each of the set of one or more UEs.

Aspect 9: The method of any of aspects 1 through 8, further comprising: determining that at least one UE of the set of one or more UEs is connected to a second base station; and transmitting, to the second base station, a message that includes a sidelink communication identification of the at least one UE to trigger the second base station to transmit a wake-up signal to the at least one UE.

Aspect 10: The method of aspect 9, wherein the message is transmitted via an X2 interface.

Aspect 11: The method of any of aspects 1 through 10, wherein receiving the uplink message further comprises: receiving either a scheduling request or a buffer status report as the uplink message.

Aspect 12: The method of any of aspects 1 through 11, wherein the one or more sidelink communication identifications comprise layer1identifiers, layer2identifiers, or layer3identifiers and the set of second identifications comprises a set of Uu interface identifiers.

Aspect 13: The method of aspect 12, wherein the set of Uu interface identifiers comprises a set of cell radio network temporary identifiers.

Aspect 14: A method for wireless communication at a first UE, comprising: receiving, from a second UE that is in an active mode, a sidelink message that comprises an identification of the second UE; determining, subsequent to receiving the identification of the second UE, to further communicate via sidelink communications with the second UE while the second UE is in an idle mode; transmitting an uplink message to a base station to trigger the base station to send a wake-up signal to the second UE, the uplink message comprising the identification of the second UE; and communicating with the second UE once the second UE has re-entered the active mode subsequent to transmission of the uplink message.

Aspect 15: The method of aspect 14, wherein transmitting the uplink message further comprises: transmitting, in the uplink message, multiple identifications of multiple UEs with which the first UE is to communicate via sidelink communications, the second UE being one of the multiple UEs.

Aspect 16: The method of any of aspects 14 through 15, wherein transmitting the uplink message further comprises: transmitting a scheduling request or a buffer status report as the uplink message.

Aspect 17: The method of any of aspects 14 through 16, wherein receiving the sidelink message further comprises: receiving an indication of a discontinuous reception cycle associated with communications at the second UE.

Aspect 18: The method of any of aspects 14 through 17, wherein the sidelink communications comprise groupcast or unicast communications.

Aspect 19: The method of any of aspects 14 through 18, wherein the identification of the second UE is one of a layer1identifier, a layer2identifier, a layer3identifier.

Aspect 20: A method for wireless communication at a second UE, comprising: transmitting, while in an active mode to a first UE, a sidelink message that includes an identification of the second UE; receiving, while in an inactive mode from a base station, a wake-up signal for triggering a transition from the inactive mode to the active mode based at least in part on transmitting the sidelink message; and communicating with the first UE once the second UE has re-entered the active mode based at least in part on receiving the wake-up signal while in the inactive mode.

Aspect 21: The method of aspect 20, wherein receiving the wake-up signal triggering the transition from the inactive mode to the active mode further comprises: receiving the wake-up signal in a first resource that is different from a second resource configured for receiving second wake-up signals for triggering the transition from the inactive mode to the active mode for base station-UE communications.

Aspect 22: The method of any of aspects 20 through 21, wherein receiving the wake-up signal triggering the transition from the inactive mode to the active mode further comprises: receiving the wake-up signal as a first sequence of a set of preconfigured sequences, wherein the first sequence is different from a second sequence of the set of preconfigured sequences, the first sequence triggering the transition from the inactive mode to the active mode for the sidelink communications, and the second sequence triggering the transition from the inactive mode to the active mode for base station-UE communications.

Aspect 23: The method of any of aspects 20 through 22, further comprising: identifying a selected active mode on duration during which the second UE is to remain in the active mode, wherein the selected active mode on duration is a longer of a first active mode on duration associated with a discontinuous reception cycle for base station-UE communications and a second active mode on duration associated with the sidelink communications; and remaining in the active mode in accordance with the selected active mode on duration.

Aspect 24: The method of any of aspects 20 through 23, further comprising: switching a transceiver mode based at least in part on receiving the wake-up signal, wherein the transceiver mode includes at least a sidelink communications mode.

Aspect 25: The method of any of aspects 20 through 24, further comprising: activating a transceiver chain based at least in part on receiving the wake-up signal; and maintaining the transceiver chain in an on state for a duration of the sidelink communication.

Aspect 26: The method of any of aspects 20 through 25, wherein the identification of the second UE is a layer1identifier, a layer2identifier, or a layer3identifier.

Aspect 27: An apparatus for wireless communication at a base station, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 1 through 13.

Aspect 28: An apparatus for wireless communication at a base station, comprising at least one means for performing a method of any of aspects 1 through 13.

Aspect 31: An apparatus for wireless communication at a first UE, comprising at least one means for performing a method of any of aspects 14 through 19.

Aspect 34: An apparatus for wireless communication at a second UE, comprising at least one means for performing a method of any of aspects 20 through 26.