WO2024109154A1

WO2024109154A1 - Sidelink wake up signal transmission

Info

Publication number: WO2024109154A1
Application number: PCT/CN2023/110598
Authority: WO
Inventors: Xiaodong Yu; Haipeng Lei; Zhennian SUN; Xin Guo
Original assignee: Lenovo (Beijing) Limited
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2024-05-30

Abstract

Various aspects of the present disclosure relate to user equipments (UEs), a base station, processors for wireless communication, methods, and non-transitory computer readable media for sidelink (SL) wake up signal (WUS) transmission. In an aspect, a first UE performs, via its transceiver and to a second UE, an SL transmission for requesting an SL WUS transmission from the second UE. Then the first UE monitors, via its transceiver, the SL WUS transmission from the second UE, and determines, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration. In this way, potential transmission collision can be eliminated and communication efficiency and quality can be improved.

Description

SIDELINK WAKE UP SIGNAL TRANSMISSION

TECHNICAL FIELD

The present disclosure relates to wireless communications, and more specifically to user equipments (UEs) , a base station, processors for wireless communication, methods, and non-transitory computer readable media for sidelink (SL) wake up signal (WUS) transmission.

BACKGROUND

A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .

In legacy downlink (DL) WUS transmission which will be described in more detail with reference to FIG. 1B, a discontinuous reception (DRX) on duration and its associated WUS reception duration are (pre) configured. If a UE receive a WUS within wake up signal reception duration and the wakeup indication = 1, the UE will perform downlink control information (DCI) monitoring in subsequent DRX on duration, else UE will not monitor DCI transmission in DRX on duration. For DL, network (for example, a baes station) transmits WUS on the resource (s) within WUS duration, there is no collision among multiple UEs by network scheduling. But for SL, more than one UEs may transmit SL WUS within WUS duration, which causes potential transmission collision when more than one UE select the same resource or non-orthogonal resource. So how to select, reserve or indicate a proper SL WUS resource within WUS duration needs to be considered.

SUMMARY

The present disclosure relates to UEs, a base station, processors for wireless communication, methods, and non-transitory computer readable media for SL WUS transmission. Embodiments of the disclosure can eliminate potential transmission collision and improve communication efficiency and quality.

In a first aspect of the solution, a first user equipment (UE) is provided. The first UE comprises a processor and a transceiver coupled to the processor, wherein the processor is configured to: perform, via the transceiver and to a second UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; monitor, via the transceiver, the SL WUS transmission from the second UE; and determine, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration.

In some implementations of the first UE, the processor and the method described herein, the SL transmission indicates one of the following: a starting point and a length of the wake up on duration, a discontinuous reception (DRX) configuration or pre-configuration information, an index of the DRX configuration or pre-configuration information, a gap between the SL transmission and the starting point of the wake up duration or DRX on duration, a gap between the SL WUS transmission and the starting point of the wake up duration or DRX on duration; a service, a service ID, a group, a group ID, a destination, a destination ID, a source, or a source ID of the first UE; a resource pool index or ID of the DRX configuration or pre-configuration information, a bandwidth part (BWP) of the DRX configuration or pre-configuration information, or a carrier index or ID of the DRX configuration or pre-configuration information; or an SL WUS request indication and an SCI format.

In some implementations of the first UE, the processor and the method described herein, the SCI format comprises a second stage SCI format.

In some implementations of the first UE, the processor and the method described herein, the SL transmission is transmitted in one of SL control information or SL data information.

In some implementations of the first UE, the processor and the method described herein, the SL transmission indicates a time slot for monitoring the SL WUS transmission, the time slot is after the SL transmission and before the wake up duration, and wherein monitoring the SL WUS transmission comprises: monitoring the SL WUS transmission within the time slot.

In some implementations of the first UE, the processor and the method described herein, the SL transmission indicates one of the following: an acknowledgement (ACK) only resource which is associated with the SL transmission resource and used for the SL WUS transmission; an ACK /negative ACK (NACK) resource which is associated with the SL transmission resource and used for the SL WUS transmission; or a reserved resource for the SL WUS transmission.

In some implementations of the first UE, the processor and the method described herein, determining whether to perform the SCI monitoring in the wake up duration comprises: in the case that an ACK is received from the second UE on the ACK only resource, determining to perform the SCI monitoring in the wake up duration or turning to active state in the wake up duration.

In some implementations of the first UE, the processor and the method described herein, determining whether to perform the SCI monitoring in the wake up duration comprises: in the case that an ACK is not received from the second UE on the ACK only resource, determining not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration.

In some implementations of the first UE, the processor and the method described herein, determining whether to perform the SCI monitoring in the wake up duration comprises: in the case that an ACK is received from the second UE on the ACK/NACK resource, determining to perform the SCI monitoring in the wake up duration or turning to active state in the wake up duration.

In some implementations of the first UE, the processor and the method described herein, determining whether to perform the SCI monitoring in the wake up duration comprises: in the case that an NACK is received from the second UE on the ACK/NACK resource, determining not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration.

In some implementations of the first UE, the processor and the method described herein, determining whether to perform the SCI monitoring in the wake up duration comprises: in the case that an ACK or NACK is not received from the second UE on the ACK/NACK resource, determining not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration.

In some implementations of the first UE, the processor and the method described herein, the SL WUS transmission is transmitted on a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH) on the reserved resource.

In some implementations of the first UE, the processor and the method described herein, the processor is further configured to: retransmit, via the transceiver, the SL transmission to the second UE in the case that the SL WUS transmission is not received from the second UE, or perform blind retransmission of the SL transmission.

In some implementations of the first UE, the processor and the method described herein, the frequency resource for the SL WUS transmission is configured or preconfigured based on a bitmap sequence per resource block (RB) or per sub-channel; and the at least one resource for the SL WUS transmission is within a physical sidelink feedback channel (PSFCH) region.

In some implementations of the first UE, the processor and the method described herein, the processor is further configured to: select randomly at least one resource for the SL transmission.

In some implementations of the first UE, the processor and the method described herein, an association between the SL transmission resource and the SL WUS transmission resource is configured or preconfigured by a network device.

In a second aspect of the solution, a processor for wireless communication is provided. The processor comprises at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: output, at a first user equipment (UE) to a second UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; monitor the SL WUS transmission from the second UE; and determine, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration.

In a third aspect of the solution, a method performed by a first user equipment (UE) is provided. The method comprises: performing, to a second UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; monitoring the SL WUS transmission from the second UE; and determining, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration.

In a fourth aspect of the solution, a second user equipment (UE) is provided. The second UE comprises a processor and a transceiver coupled to the processor, wherein the processor is configured to: receive, via the transceiver and from a first UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; and provide, to the first UE and through an operation related to the SL WUS transmission, an indication of whether to transmit sidelink control information (SCI) to the first UE in a wake up duration of the first UE.

In some implementations of the second UE, the processor and the method described herein, the SL transmission indicates one of the following: a starting point and a length of the wake up on duration, a discontinuous reception (DRX) configuration or pre-configuration information, an index of the DRX configuration or pre-configuration information, a gap between the SL transmission and the starting point of the wake up duration or DRX on duration, a gap between the SL WUS transmission and the starting point of the wake up duration or DRX on duration; a service, a service ID, a group, a group ID, a destination, a destination ID, a source, or a source ID of the first UE; a resource pool index or ID of the DRX configuration or pre-configuration information, a bandwidth part (BWP) of the DRX configuration or pre-configuration information, or a carrier index or ID of the DRX configuration or pre-configuration information; or an SL WUS request indication and an SCI format.

In some implementations of the second UE, the processor and the method described herein, the SCI format comprises a second stage SCI format.

In some implementations of the second UE, the processor and the method described herein, the SL transmission is received in one of SL control information or SL data information.

In some implementations of the second UE, the processor and the method described herein, the SL transmission indicates a time slot for the SL WUS transmission, and the time slot is after the SL transmission and before the wake up duration.

In some implementations of the second UE, the processor and the method described herein, the SL transmission indicates one of the following: an acknowledgement (ACK) only resource which is associated with the SL transmission resource and used for the SL WUS transmission; an ACK /negative ACK (NACK) resource which is associated with the SL transmission resource and used for the SL WUS transmission; or a reserved resource for the SL WUS transmission.

In some implementations of the second UE, the processor and the method described herein, the SL transmission indicates an ACK only resource, and providing the indication to the first UE comprises: transmitting, via the transceiver, an ACK to the first UE on the ACK only resource to indicate that an SCI is to be transmitted to the first UE in the wake up duration of the first UE; or preventing from performing a transmission on the ACK only resource to indicate that an SCI is not to be transmitted to the first UE in the wake up duration of the first UE.

In some implementations of the second UE, the processor and the method described herein, the SL transmission indicates an ACK/NACK resource, and providing the indication to the first UE comprises: transmitting, via the transceiver, an ACK to the first UE on the ACK/NACK resource to indicate that an SCI is to be transmitted to the first UE in the wake up duration of the first UE; or transmitting, via the transceiver, a NACK to the first UE on the ACK/NACK resource to indicate that an SCI is not to be transmitted to the first UE in the wake up duration of the first UE.

In some implementations of the second UE, the processor and the method described herein, the SL WUS transmission is transmitted on a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH) on the reserved resource.

In some implementations of the second UE, the processor and the method described herein, at least frequency resource for the SL WUS transmission is (pre) configured based on a bitmap sequence per resource block (RB) or per sub-channel; and the at least one resource for the SL WUS transmission is within a physical sidelink feedback channel (PSFCH) region.

In some implementations of the second UE, the processor and the method described herein, an association between the SL transmission resource and the SL WUS transmission resource is configured or preconfigured by a network device.

In a fifth aspect of the solution, a processor for wireless communication is provided. The processor comprises at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: obtain, at a second user equipment (UE) and from a first UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; and provide, to the first UE and through an operation related to the SL WUS transmission, an indication of whether to transmit sidelink control information (SCI) to the first UE in a wake up duration of the first UE.

In a sixth aspect of the solution, a method performed by a second user equipment (UE) is provided. The method comprises: receiving, at the second UE and from a first UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; and providing, to the first UE and through an operation related to the SL WUS transmission, an indication of whether to transmit sidelink control information (SCI) to the first UE in a wake up duration of the first UE.

In a seventh aspect of the solution, a base station (BS) is provided. The base station comprises a processor and a transceiver coupled to the processor, wherein the processor is configured to: transmit, to a first user equipment (UE) , a mapping rule between a sidelink (SL) transmission and an associated resource for SL wake up signal (WUS) transmission, wherein the sidelink transmission is a request for an SL wake up signal (WUS) transmission from a second UE.

In some implementations of the base station, the processor and the method described herein, the processor is further configured to: transmit, to the first UE, configuration information indicative of a frequency resource for SL WUS, wherein the frequency resource is located within a physical sidelink feedback channel (PSFCH) region and indicated by a bitmap sequence per resource block (RB) or per sub-channel.

In an eighth aspect of the solution, a processor for wireless communication is provided. The processor comprises at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: output, to a first user equipment (UE) , a mapping rule between a sidelink (SL) transmission and an associated resource for SL wake up signal (WUS) transmission, wherein the sidelink transmission is a request for an SL wake up signal (WUS) transmission from a second UE.

In a ninth aspect of the solution, a method performed by a base station (BS) is provided. The method comprises: transmitting, to a first user equipment (UE) , a mapping rule between a sidelink (SL) transmission and an associated resource for SL wake up signal (WUS) transmission, wherein the sidelink transmission is a request for an SL wake up signal (WUS) transmission from a second UE.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A illustrates an example of a wireless communications system that supports SL WUS transmission in accordance with aspects of the present disclosure.

FIG. 1B illustrates a schematic diagram of an example DL WUS and related DRX configuration associated with aspects of the present disclosure.

FIG. 2 illustrates a signaling chart illustrating an example communication process in accordance with aspects of the present disclosure.

FIG. 3 illustrates another signaling chart illustrating an example communication process in accordance with aspects of the present disclosure.

FIG. 4A illustrates a schematic diagram of an example SL WUS transmission in accordance with aspects of the present disclosure.

FIG. 4B illustrates another schematic diagram of an example SL WUS transmission in accordance with aspects of the present disclosure.

FIG. 4C illustrates a schematic diagram of a structure of a resource pool in accordance with aspects of the present disclosure.

FIG. 5A illustrates a schematic diagram of an example SL retransmission in accordance with aspects of the present disclosure.

FIG. 5B illustrates another schematic diagram of an example SL non-retransmission in accordance with aspects of the present disclosure.

FIG. 6 illustrates another schematic diagram of an example SL WUS transmission in accordance with aspects of the present disclosure.

FIGS. 7 through 9 illustrate examples of devices that support SL WUS transmission in accordance with aspects of the present disclosure.

FIGS. 10 through 12 illustrate examples of processors that support SL WUS transmission in accordance with aspects of the present disclosure.

FIGS. 13 through 15 illustrate flowcharts of methods that support SL WUS transmission in accordance with aspects of the present disclosure.

Throughout the drawings, the same or similar reference numerals represent the same or similar elements.

DETAILED DESCRIPTION

Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below. In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It shall be understood that although the terms “first” and “second” or the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms. In some examples, values, procedures, or apparatuses are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments. As used herein, the singular forms “a, ” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises, ” “comprising, ” “has, ” “having, ” “includes” and/or “including, ” when used herein, specify the presence of stated features, elements, components and/or the like, but do not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof. For example, the term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ” The term “based on” is to be read as “based at least in part on. ” The term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ” The term “another embodiment” is to be read as “at least one other embodiment. ” The use of an expression such as “A and/or B” can mean either “only A” or “only B” or “both A and B. ” Other definitions, explicit and implicit, may be included below.

As mentioned above, for SL, it is different from DL in that more than one UEs may transmit SL WUS within WUS duration, which causes potential transmission collision when more than one UE selects the same resource or non-orthogonal resource. So how to select, reserve or indicate a proper SL WUS resource within WUS duration needs to be considered.

In view of the above, embodiments of the present disclosure provide a solution for SL WUS transmission. In an aspect of the solution, a first user equipment (UE) performs, to a second UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE. The first UE monitors the SL WUS transmission from the second UE. The first UE determines, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration. In this way, the potential transmission collision as mentioned above can be eliminated, hence communication efficiency and quality can be improved.

FIG. 1A illustrates an example of a wireless communications system 100 that supports SL WUS transmission in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) or network device) , one or more UEs 104, a core network 106, and a packet data network 108. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.

The one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. A network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.

A network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112. For example, a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102. Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In some other implementations, a UE 104 may be mobile in the wireless communications system 100.

The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in FIG. 1A. A UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in FIG. 1A. Additionally, or alternatively, a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.

A UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.

A network entity 102 may support communications with the core network 106, or with another network entity 102, or both. For example, a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) . In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102) . In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) . In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .

In some implementations, a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.

An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .

Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160.

Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .

A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.

The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.

The core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The packet data network 108 may include an application third 118. In some implementations, one or more UEs 104 may communicate with the application third 118. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102. The core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application third 118 using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .

In the wireless communications system 100, the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the network entities 102 and the UEs 104 may support different resource structures. For example, the network entities 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the network entities 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.

One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.

A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.

Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.

In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.

FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.

FIG. 1B illustrates a schematic diagram of an example DL WUS and related DRX configuration 100B associated with aspects of the present disclosure. In the example illustrated in FIG. 1B, during the first DL WUS duration of a DRX cycle, a UE (for example UE 104 as illustrated in FIG. 1A) receives a wakeup indication from a base station (for example, a network entity 102 as illustrated in FIG. 1A) , whose value is “1” , which means that the UE should wake up for DL reception in the next wakeup duration (i.e., DRX on duration in this DRX scenario) . In this case, the UE wakes up during the next wakeup duration of the DRX cycle to perform DL reception from the base station. During the second SL WUS duration of a DRX cycle, the UE receives a wakeup indication from the base station, whose value is “0” , which means that the UE should sleep away (do not wake up) in the next wakeup duration. In this case, the UE sleeps away during the next wakeup duration of the DRX cycle, as indicated by “No Wakeup” shown in FIG. 1B. It is to be noted that the indication of “wakeup indication = 0” may be performed in an implicit manner, for example, by simply ignoring transmission of the wakeup indication in the SL WUS indication /detection duration.

As described above with reference to FIG. 1B, for DL, the baes station transmits WUS on the resource (s) within WUS duration, and there is no collision among multiple UEs by network scheduling. But for SL, for a specific UE, more than one UEs may transmit SL WUS to the specific UE within a WUS duration of the specific UE, which causes potential SL WUS transmission collision when more than one UE select the same resource or non-orthogonal resource to transmit SL WUS to the specific UE within a WUS duration of the specific UE. So how to select, reserve or indicate a proper SL WUS resource within WUS duration needs to be considered.

FIG. 2 illustrates a signaling chart illustrating an example communication process 200 in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the communication process 200 will be described with reference to FIG. 1A. The communication process 200 may involve a user equipment (UE) 104-1 (which is also referred to as “first UE” hereafter) and another user equipment 104-2 (which is also referred to as “second UE” hereafter) . The first and second UEs 104-1 and 104-2 may each be an example of the user equipment 104 as illustrated in FIG. 1A.

As illustrated in FIG. 2, the first UE 104-1 performs (210) , via its transceiver and to the second UE 104-2, a sidelink (SL) transmission 201 for requesting an SL wake up signal (WUS) transmission from the second UE 104-2. The first UE 104-1 may select randomly at least one resource for the SL transmission 201. At the other end of communication, the second UE 104-2 receives (212) the sidelink transmission 201 for requesting an SL wake up signal (WUS) transmission from the second UE 104-2.

The SL transmission 201 may indicate a starting point and a length of the wake up on duration, a discontinuous reception (DRX) configuration or pre-configuration information, an index of the DRX configuration or pre-configuration information, a gap between the SL transmission and the starting point of the wake up duration or DRX on duration, a gap between the SL WUS transmission and the starting point of the wake up duration or DRX on duration. Such information is illustrated, for example, in FIGS. 4A and 4B. Alternatively or additionally, the SL transmission 201 may indicate a service, a service ID, a group, a group ID, a destination, a destination ID, a source, or a source ID of the first UE. The service may be a service the second UE 104-2 can provide to the first UE 104-1 during the wake up on duration after the SL WUS transmission. Alternatively or additionally, the SL transmission 201 may indicate a resource pool index or ID of the DRX configuration or pre-configuration information, a bandwidth part (BWP) of the DRX configuration or pre-configuration information, or a carrier index or ID of the DRX configuration or pre-configuration information. Alternatively or additionally, the SL transmission 201 may indicate an SL WUS request indication and an SCI format. In some implementations, the SCI format may comprise a second stage SCI format.

More specifically, the SL transmission 201 may be transmitted in one of SL control information or SL data information. In some implementations, the SL transmission 201 may indicate a time slot for monitoring the SL WUS transmission, the time slot is after the SL transmission and before the wake up duration, and in order to monitor the SL WUS transmission, the first UE 104-1 may monitor the SL WUS transmission within the time slot.

For example, the SL transmission 201 may indicate an acknowledgement (ACK) only resource which is associated with the SL transmission resource and used for the SL WUS transmission. Here, “ACK only resource” means that on the ACK only resource, only ACK may be transmitted. “SL transmission resource” refers to a resource on which the SL transmission 201 is transmitted. Alternatively or additionally, the SL transmission 201 may indicate an ACK /negative ACK (NACK) resource which is associated with the SL transmission resource and used for the SL WUS transmission. Alternatively or additionally, the SL transmission 201 may indicate a reserved resource for the SL WUS transmission. Reference is now made back to FIG. 2. At block 220, the first UE 104-1 monitors, via its transceiver, the SL WUS transmission from the second UE 104-2.

The second UE 104-2 may provide (230) , to the first UE 104-1 and through an operation related to the SL WUS transmission, an indication 202 of whether to transmit sidelink control information (SCI) to the first UE 104-1 in a wake up duration of the first UE 104-1. On the other side of communication, the first UE 104-1 may receive (232) , from the second UE 104-2, an indication of whether the second UE 104-2 will transmit sidelink control information (SCI) to the first UE 104-1 in a wake up duration of the first UE 104-1. For example, the SL WUS transmission may be transmitted on a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH) on the reserved resource.

For example, the SL transmission 201 may indicate an ACK/NACK resource. In this case, in order to provide the indication 202 to the first UE 104-1, the second UE 104-2 may transmit, via its transceiver, an ACK to the first UE 104-1 on the ACK/NACK resource to indicate that an SCI is to be transmitted to the first UE 104-1 in the wake up duration of the first UE 104-1. Alternatively, the second UE 104-2 may transmit, via its transceiver, a NACK to the first UE 104-1 on the ACK/NACK resource to indicate that an SCI is not to be transmitted to the first UE 104-1 in the wake up duration of the first UE 104-1.

Alternatively, in order to provide the indication 202 to the first UE 104-1, the second UE 104-2 may transmit, via its transceiver, an ACK to the first UE 104-1 on the ACK only resource to indicate that an SCI is to be transmitted to the first UE 104-1 in the wake up duration of the first UE 104-1. Alternatively, the second UE 104-2 may prevent from performing a transmission on the ACK only resource to indicate that an SCI is not to be transmitted to the first UE 104-1 in the wake up duration of the first UE 104-1.

The frequency resource for transmitting the SL WUS may be configured or preconfigured based on a bitmap sequence per resource block (RB) or per sub-channel, which will be described in more detail with reference to FIG. 4C. Additionally, the frequency resource for transmitting the SL WUS may be within a physical sidelink feedback channel (PSFCH) region.

In case the SL WUS transmission is not received from the second UE 104-2 after the first UE 104-1performs the SL transmission 201 to the second UE 104-2, the first UE 104-1 may retransmit, via its transceiver, the SL transmission 201 to the second UE 104-2. Alternatively, the first UE 104-1 may perform blind retransmission of the SL transmission 201 to the second UE 104-2 in case the SL WUS transmission is not received from the second UE 104-2 after the first UE 104-1performs the SL transmission 201 to the second UE 104-2.

Reference is now made back to FIG. 2. At block 240, the first UE 140-1 determines, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration. In order to determine whether to perform the SCI monitoring in the wake up duration, the first UE 104-1 may, in the case that an ACK is received from the second UE 104-2 on the ACK only resource, determine to perform the SCI monitoring in the wake up duration or turning to active state in the wake up duration. Alternatively, in the case that an ACK is not received from the second UE 104-2 on the ACK only resource, the first UE 104-1 may determine not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration. Alternatively, in the case that an ACK is received from the second UE 104-2 on the ACK/NACK resource, the first UE 104-1 may determine to perform the SCI monitoring in the wake up duration. Alternatively, in the case that an NACK is received from the second UE 104-2 on the ACK/NACK resource, the first UE 104-1 may determine not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration. Alternatively, in the case that an ACK or NACK is not received from the second UE 104-2 on the ACK/NACK resource, the first UE 104-1 may determine not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration. For example, the wake up duration may be a DRX on duration of a DRX cycle.

Under some circumstances, an association (which may also be referred to as mapping rule, or mapping relationship) between the SL transmission resource (i.e., resource for SL transmission 201) and the SL WUS transmission resource (i.e., resource SL WUS transmission for) may be configured or preconfigured by a base station (BS) 102. The base station 102 may be a network entity 102 as illustrated in FIG. 1A. In this case, the base station 102 may transmit (250) , to the first UE 104-1, a mapping rule 203 between a sidelink (SL) transmission (for example, SL transmission 201 as illustrated in FIG. 2) and an associated resource for SL wake up signal (WUS) transmission. Here, the sidelink transmission may be a request for an SL wake up signal (WUS) transmission from the second UE 104-2. On the other side of communication, the first UE 104-1 receives (252) the mapping rule 203. The base station 102 may also transmit the mapping rule 203 to the second UE 104-2 to facilitate sidelink communication between the first UE 104-1 and the second UE 104-2. The base station 102 may further transmit, to the first UE 104-1, configuration information indicative of a frequency resource for SL WUS. Here, the frequency resource is located within a physical sidelink feedback channel (PSFCH) region and indicated by a bitmap sequence per resource block (RB) or per sub-channel.

It is to be noted that, the second UE 104-2 may provide (230) the indication 202 to the first UE 104-1 in an implicit way, where there is no actual transmission of the indication 202. In other words, the second UE 104-2 may convey information on whether to transmit sidelink control information (SCI) to the first UE 104-1 in a wake up duration of the first UE 104-1 by ignoring transmission of the indication 202.

In this way, potential SL WUS transmission collision as described above can be eliminated and communication efficiency and quality can thus be improved.

FIG. 3 illustrates another signaling chart illustrating an example communication process 300 in accordance with aspects of the present disclosure. As illustrated in FIG. 3, a first transmission 301 is introduced for requesting and indicating/reserving SL WUS resource. For the purpose of discussion, the communication process 300 will be described with reference to FIGS. 1A and 2. The communication process 300 may involve the first user equipment 140-1 and the second user equipment 140-2 as illustrated in FIG. 2.

In some example embodiments, as illustrated in FIG. 3, the first user equipment 140-1 transmits (310) , to the second user equipment 140-2, an SL transmission 301 for the SL WUS transmission. On the other side of communication, the second UE 140-2 receives (312) the SL transmission 301. The SL transmission 301 may be regarded as a DRX on duration request.

The SL transmission 301 may include the wake up duration starting point (time slot) , length of wake up on duration, the DRX (pre) configuration information, the DRX (pre) configuration information index, the gap between the SL transmission 301 and starting point of wake up time or DRX on duration, the gap between the WUS transmission and starting point of wake up time or DRX on duration. For example, in case the wake up duration is a DRX on duration, the SL transmission 301 can be regarded as a DRX on duration request, for example, to request the first UE 104-1 to receive SL data from the second UE 104-2.

Alternatively or additionally, the SL transmission 301 may include interested service/service ID, and/or group/group ID, and/or destination/destination ID, are/or source/source ID of the first UE. Alternatively or additionally, the SL transmission 301 may include a resource pool index/ID of DRX (pre) configuration information, and/or a bandwidth part (BWP) of DRX (pre) configuration information, and/or a carrier index/ID of DRX (pre) configuration information, for cross carrier/resource pool/BWP scheduling. Alternatively or additionally, the SL transmission 301 may include SL WUS request indication, and/or SCI format X, and/or 2nd stage SCI format in SCI.

It is to be noted that, the SL transmission 301 may be transmitted in SL control information. For example, the SL transmission 301 may be transmitted from the first UE 104-1 to the second UE 104-2 in the first/second stage SCI. Alternatively, the SL transmission 301 may be transmitted in SL data information. For example, the SL transmission 301 may be transmitted in a media access control (MAC) control element (CE) message.

In some implementations, a mapping (or association) rule between a sidelink (SL) transmission (for example, SL transmission 201 as illustrated in FIG. 2) and an associated resource for SL wake up signal (WUS) transmission may be configured to the first UE 104-1 by a base station. Here, the sidelink transmission may be a request for an SL wake up signal (WUS) transmission from the second UE 104-2. In some implementations, configuration information indicative of a frequency resource for SL WUS may be transmitted to the first UE 104-1 from the base station. Here, the frequency resource may be located within a physical sidelink feedback channel (PSFCH) region and indicated by a bitmap sequence per resource block (RB) or per sub-channel. The association or mapping relationship may be between the resource for SL transmission (for example, SL transmission 201 as illustrated in FIG. 2, or SL transmission 301 as illustrated in FIG. 3) and the resource for SL WUS indication (or transmission) (for example, resource for SL WUS transmission 302 as illustrated in FIG. 3) . Here, “resource for SL transmission” means the resource on which the SL transmission is transmitted from the first UE 104-1 to the second UE 104-2. In this way, SL WUS transmission resource may be implicitly indicated by the SL transmission. In other words, the second UE 104-2 may determine the SL WUS transmission resource based on the resource for SL transmission (time slot and frequency location) . The second UE 104-2 may determine the SL WUS transmission resource also based on the frequency resources (region) for the SL WUS transmission.

For example, the first UE 104-1 can indicate, in the SL transmission 301, an SL WUS transmission slot which is located after the SL transmission 301 and before the DRX duration, as indicated in FIG. 3. If the second UE 104-2 determines it has a service/service ID, and/or group/group ID, and/or destination/destination ID, and/or source/source ID interested by the first UE 104-1, i.e., if the target of the SL WUS transmission of the second UE 104-2 is the first UE 104-1, the second UE 104-2 will transmit an SL WUS in the WUS transmission slot indicated by the first UE 104-1, for example, as indicated in the SL transmission 301.

Specifically, the SL WUS transmission slot may be explicitly indicated in the SL transmission 301, for example, as a reserved resource indicated in the SL transmission 301. Alternatively, the SL WUS transmission slot may be implicitly indicated that the SL WUS resource is similar with ACK or NACK transmitted in WUS transmission slot. In other words, the indicated resource may be an ACK/NACK resource associated with the SL transmission 301, e.g., based on legacy mapping rule between the SL transmission 301 and its associated ACK/NACK transmission. If the second UE 104-2 transmits an ACK on the ACK/NACK resource and the first UE 104-1 receives the ACK transmission, the first UE 104-1 interprets the received ACK transmission as the SL WUS transmission 302 (i.e., the first UE 104-1 interprets the received ACK transmission as an SL WUS indication indicating that the second UE 104-2 has SL data to be transmitted to the first UE 104-1) , and will perform SCI monitoring within the next DRX on duration. Otherwise if the second UE 104-2 transmits a NACK on the ACK/NACK resource and the first UE 104-1 receives the NACK transmission, the first UE 104-1 interprets the received NACK transmission as an SL WUS indication indicating that the second UE 104-2 has no SL data to be transmitted to the first UE 104-1, and will not perform SCI monitoring within the next DRX on duration.

Reference is now made back to FIG. 3. In response to receipt of the SL transmission 301, the second UE 140-2 transmits (320) an SL WUS transmission 302. The SL WUS transmission 302 may be transmitted on associated resource, i.e., resource associated with SL WUS transmission 302 as indicated by the first UE 104-1 in the SL transmission 301. Alternatively, the SL WUS transmission 302 may be transmitted on reserved resource, i.e., resource reserved for SL WUS transmission 302, for example, as indicated by the first UE 104-1 in the SL transmission 301. On the other side of communication, the first UE 104-1 may receive (322) the SL WUS transmission 302 from the second UE 104-2.

Based on the SL WUS transmission 302, DRX on duration starts at the first UE 104-1. During the DRX on duration, the second UE 104-2 may transmit subsequent SL transmission (s) 303 to the first UE 104-1. On the other side of communication, the first UE 104-1 receives the SL transmission (s) 303 from the second UE 104-2.

FIG. 4A illustrates a schematic diagram of an example SL WUS transmission 400A in accordance with aspects of the present disclosure. FIG. 4B illustrates another schematic diagram of an example SL WUS transmission 400B in accordance with aspects of the present disclosure. As shown in FIGS. 4A and 4B, 401 denotes a subframe on which the SL transmission (for example, SL transmission 201 as illustrated in FIG. 2, or SL transmission 301 as illustrated in FIG. 3) is transmitted from a first UE (for example, UE 104-1 as illustrated in FIGS. 2 and 3) to a second UE (for example, UE 104-2 as illustrated in FIGS. 2 and 3) , 402 denotes a subframe on which the SL WUS is transmitted from the second UE 104-2 to the first UE 104-1, and 403 denotes a DRX on duration during which the second UE 104-2 transmits data to the first UE 104-1. For the purpose of discussion, the SL WUS transmissions 400A and 400B will be described with reference to FIGS. 2 and 3. FIG. 4B differs from FIG. 4A in that in the example illustrated in FIG. 4A, SL WUS is transmitted on PSSCH/PSCCH resources, while in the example illustrated in FIG. 4B, SL WUS is transmitted on PSFCH resources.

In some example embodiments, the SL WUS resource is an ACK only resource associated with the SL transmission (for example, SL transmission 301 as illustrated in FIG. 3) , or the SL WUS transmission (for example, SL WUS transmission 302 as illustrated in FIG. 3) is (pre) configured/ (pre) defined as ACK only transmission. For example, a new mapping rule between the SL transmission 301 and its associated ACK transmission may be configured to the first UE 104-1 and second UE 104-2 by a base station (for example, a base station 102 as illustrated in FIG. 1A) . If the second UE 104-2 transmits an ACK on the ACK only resource and the first UE 104-1 receives the ACK transmission, the first UE 104-1 may interpret the received ACK transmission as the SL WUS transmission 302 (i.e., the first UE 104-1 interprets the received ACK transmission as an SL WUS indication indicating that the second UE 104-2 has SL data to be transmitted to the first UE 104-1) , and will perform SCI monitoring within the next DRX on duration. Otherwise if the first UE 104-1 doesn’t receive the ACK transmission, the first UE 104-1 may interpret that an SL WUS indication with value “0” indicating that the second UE 104-2 has no SL data to be transmitted to the first UE 104-1 is received, and will not perform SCI monitoring within the next DRX on duration.

In some example embodiments, the SL WUS resource can be (pre) configured to ACK only resource for groupcast and broadcast. When multiple UEs have potential transmission (s) with service/service ID and/or group/group ID and/or destination/destination ID and/or source/source ID interested by the first UE 104-1, multiple UEs can transmit SL WUS (ACK) simultaneously on the same SL WUS resource. It has a combination reception gain at the first UE side (i.e., at the first UE 104-1) , and the resource efficiency is higher when comparing with multiple UEs transmitting SL WUS on separate resources.

In some example embodiments, the SL WUS resource can be (pre) configured to ACK/NACK resource for unicast. It increases the reliability for SL WUS request transmission and SL WUS repetition. When the first UE 104-1 doesn’t detect the feedback on SL WUS resource, i.e., no ACK or NACK transmitted on SL WUS resource, the first UE 104-1 can perform a retransmission of the SL transmission 301 for requesting SL WUS (i.e., ACK or NACK) again.

FIG. 4C illustrates a schematic diagram of a structure of a resource pool 400C in accordance with aspects of the present disclosure. There are 4 subchannels shown in FIG. 4C. For example, there may be a resource pool of 100 RB, which are allocated to 4 subchannels as shown in FIG. 4C. For example, each subchannel may be 25 RB in frequency region. Hereafter, it is assumed that a time slot includes 14 symbols. As shown in FIG. 4C, there are normal timeslot without PSFCH region, and timeslot with PSFCH region.

In some example embodiments, the network (for example, a base station 102 as illustrated in FIG. 1A) (pre) configures the frequency resource of SL WUS within PSFCH region by a bitmap sequence {0, 0, 0, …, 1, 1, 1, 1…, 0, 0, 0...} (100 bits) per RB indication, and {0, 1, 0, 0} per subchannel indication. The frequency resource of SL WUS within PSFCH region may include ACK only resource. Alternatively or additionally, the frequency resource of SL WUS within PSFCH region may include ACK/NACK resource for SL WUS. The SL WUS resource is (pre) configured orthogonally with legacy ACK/NACK and NACK only feedback resource and IUC resource.

For example, in the example as illustrated in FIG. 4C, it is assumed that the 4 subchannels are from a higher RB index to a lower RB index in the up-bottom direction, and the PSFCH region is used as SL WUS region in the second subchannel. In such a case, for the first time slot, the frequency resource of SL WUS within PSFCH region may be indicated by a bitmap sequence as {0, 1, 0, 0} on a per-subchannel basis. Alternatively, the frequency resource of SL WUS within PSFCH region may be indicated by a bitmap sequence as {0, 0, 0, 0, 0…0, 1, 1, 1, 1, 1…1, 0, 0, 0, 0, 0…0} on a per-RB basis. Here, the first all “0” sub-sequence {0, 0, 0, 0, 0, …0} before the all “1” sub-sequence {1, 1, 1, 1, 1…1} includes 25 “0” s, indicating that the PSFCH region in the upmost subchannel shown in FIG. 4C is not used as SL WUS resource region; the all “1” sub-sequence {1, 1, 1, 1, 1…1} includes 25 “1” s, indicating that the PSFCH region in the second subchannel shown in FIG. 4C is in its entirety used as SL WUS resource region; and the second all “0” sub-sequence {0, 0, 0, 0, 0…0} after the all “1” sub-sequence {1, 1, 1, 1, 1…1} includes 50 “0” s, indicating that the PSFCH region in the two lower subchannels shown in FIG. 4C are not used as SL WUS resource region. Alternatively, when a bitmap sequence (i.e., a first bitmap sequence) on a per-subchannel basis is already (pre) configured to the first UE 104-1 and second UE 104-2, the base station may further (pre) configure another bitmap sequence (i.e., a second bitmap sequence) on a per-RB basis to the first UE 104-1 and second UE 104-2. For example, in the example illustrated in FIG. 4C, the second bitmap sequence may include 25 “1” s to indicate that the PSFCH region in the subchannel indicated by the first bitmap sequence (i.e., the second subchannel shown in FIG. 4C) is in its entirety used as SL WUS resource region.

As shown in FIG. 4C, in case a PSFCH region is in its entirety used as SL WUS resource region, the frequency resource of SL WUS within PSFCH region may be indicated by a bitmap sequence on a per-subchannel basis. Alternatively, the frequency resource of SL WUS within PSFCH region may be indicated by a bitmap sequence on a per-RB basis.

In some example embodiments, a part of a PSFCH region may be used as SL WUS resource region. In such a case, the frequency resource of SL WUS within PSFCH region may be indicated by a first bitmap sequence on a per-subchannel basis and additionally a second bitmap sequence on a per-RB basis. For the third time slot, the frequency resource of SL WUS within PSFCH region may be indicated by a bitmap sequence as {0, 0, 1, 0} on a per-subchannel basis. Alternatively, the base station may further (pre) configure another bitmap sequence on a per-RB basis to the first UE 104-1 and second UE 104-2. For example, in the example illustrated in FIG. 4C, the another bitmap sequence may include 25 “1” s to indicate that the PSFCH region in the subchannel indicated by the per-subchannel bitmap sequence (i.e., the third subchannel) is in its entirety used as SL WUS resource region. In case only part of the PSFCH region of a subchannel is used as SL WUS resource region, for example, only the upper 5 RBs are used as SL WUS resource region, the per-RB bitmap sequence may be indicated as {1, 1, 1, 1, 1, 0, 0…0, 0} on a per-RB basis; that is, an all “1” sub-sequence with 5 “1” s followed by an all “0” sub-sequence with 20 “0” s.

To avoid the half duplex issue, the first UE 104-1 may transmit more than one transmission to request a SL WUS for a (pre) configured DRX (pre) configuration information. For the purpose of discussion, an SL retransmissions 500A and non-retransmission 500B will be described with reference to FIGS. 2 and 3.

FIG. 5A illustrates a schematic diagram of an example SL retransmission 500A in accordance with aspects of the present disclosure. For example, as illustrated in FIG. 5A, if the first UE 104-1 transmits the SL transmission (for example, SL transmission 201 as illustrated in FIG. 2, or SL transmission 301 as illustrated in FIG. 3) to the second UE 104-2 on resource 501 and doesn’t receive the ACK or NACK of ACK/NACK or ACK of ACK only on SL WUS on ACK/NACK resource or ACK only resource (the resource on which the SL transmission is transmitted, i.e., 502 as denoted in FIG. 5A) , i.e., no feedback is received on the (pre) configured or reserved resource 502 or a NACK is received, the first UE 104-1 will perform retransmission (subsequent transmission (s) ) of the SL transmission on the resource 501 to obtain an SL WUS from the second UE 104-2, without perform SCI monitoring within the next DRX on duration 505. This is indicated in FIG. 5A as “DRX off when received NACK or DTX” . In other words, if the first UE 104-1 doesn’t receive feedback from the second UE 104-2 on SL WUS resource, the first UE 104-1 will perform retransmission of the first SL transmission 301 for SL WUS indication from the second UE 104-2, until a feedback from the second UE 104-2 is received. Alternatively, the first UE 104-1 may perform blind retransmission of the SL transmission 201.

FIG. 5B illustrates another schematic diagram of an example SL non-retransmission 500B in accordance with aspects of the present disclosure. For example, contrary to the example as shown in FIG. 5A, if the first UE 104-1 transmits the SL transmission (for example, SL transmission 201 as illustrated in FIG. 2, or SL transmission 301 as illustrated in FIG. 3) to the second UE 104-2 on resource 501 and receives a feedback from the second UE 104-2 on SL WUS resource 502, for example, an ACK or NACK or ACK only (here, “ACK only” means an ACK transmitted on an ACK only resource for the SL WUS transmission) is received from the second UE 104-2 on resource 502, the first UE 104-1 may perform SCI monitoring within the next DRX on duration 510 without performing retransmission (subsequent transmission (s) , which is denoted as the dotted resources 501 and 502) of the SL transmissions 201.

FIG. 6 illustrates another schematic diagram of an example SL WUS transmission 600 in accordance with aspects of the present disclosure. In the example as illustrated in FIG. 6, the SL WUS is transmitted from the second UE 104-2 to the first UE 104-1 on a reserved resource for the SL WUS transmission indicated in the SL transmission (for example, the SL transmission 201 as illustrated in FIG. 2, or SL transmission 301 as illustrated in FIG. 3) .

Specifically, in the example illustrated in FIG. 6, the first UE 104-1 transmits an SL transmission on resource 601 to indicate a reserved resource for the SL WUS transmission. For example, the first UE 104-1 may transmit the SL transmission on resource 601 in unicast manner to the second UE 104-2. Then, the SL WUS (for example, SL WUS transmission 302 as illustrated in FIG. 3) is transmitted from the second UE 104-2 to the first UE 104-1 on the indicated reserved resource (in FIG. 6, resource 602) . For example, the SL WUS may be transmitted on the PSCCH and/or PSSCH on reserved resource. For example, an ACK may be transmitted on the PSCCH and/or PSSCH on reserved resource. In such a case, the first UE 104-1 may receive the ACK from the second UE 104-2 on resource 602, then the first UE 104-1 may perform SCI monitoring within the next DRX on duration 603 for subsequent SL transmission from the second UE 104-2.

It is to be noted that, in some example embodiments, the resource for the SL transmission (for example, the SL transmission 201 as illustrated in FIG. 2, or SL transmission 301 as illustrated in FIG. 3) can be random selected by the first UE 104-1.

FIG. 7 illustrates an example of a device 700 that supports SL WUS transmission in accordance with aspects of the present disclosure. The device 700 may be an example of a first UE 104-1 as described herein. The device 700 may support wireless communication with one or more network entities 102, UEs 104, core networks 106 or any combination thereof. The device 700 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 702, a memory 704, a transceiver 706, and, optionally, an I/O controller 708. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .

The processor 702, the memory 704, the transceiver 706, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may support a method for performing one or more of the operations described herein.

In some implementations, the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 702 and the memory 704 coupled with the processor 702 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) .

For example, the processor 702 may support wireless communication at the device 700 in accordance with examples as disclosed herein. The processor 702 may be configured to operable to support a means for obtaining a change of network coverage state of a UE, wherein the UE is the first UE or one of at least one second UE associated with a first positioning operation for the first UE; and transmitting, to a third UE associated with the first positioning operation or a network device, an indication of the change of network coverage state of the UE.

The processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 702 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 702. The processor 702 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 704) to cause the device 400 to perform various functions of the present disclosure.

The memory 704 may include random access memory (RAM) and read-only memory (ROM) . The memory 704 may store computer-readable, computer-executable code including instructions that, when executed by the processor 702 cause the device 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 702 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 704 may include, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The I/O controller 708 may manage input and output signals for the device 700. The I/O controller 708 may also manage peripherals not integrated into the device 700. In some implementations, the I/O controller 708 may represent a physical connection or port to an external peripheral. In some implementations, the I/O controller 708 may utilize an operating system such as or another known operating system. In some implementations, the I/O controller 708 may be implemented as part of a processor, such as the processor 706. In some implementations, a user may interact with the device 700 via the I/O controller 708 or via hardware components controlled by the I/O controller 708.

In some implementations, the device 700 may include a single antenna 710. However, in some other implementations, the device 700 may have more than one antenna 710 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 706 may communicate bi-directionally, via the one or more antennas 710, wired, or wireless links as described herein. For example, the transceiver 706 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 706 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 710 for transmission, and to demodulate packets received from the one or more antennas 710. The transceiver 706 may include one or more transmit chains, one or more receive chains, or a combination thereof.

A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 410 for transmitting the amplified signal into the air or wireless medium.

A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 710 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.

FIG. 8 illustrates an example of a device 800 that supports SL WUS transmission in accordance with aspects of the present disclosure. The device 800 may be an example of a second UE 104-2 as described herein. The device 800 may support wireless communication with one or more network entities 102, UEs 104, core networks 106 or any combination thereof. The device 800 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 802, a memory 804, a transceiver 806, and, optionally, an I/O controller 808. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .

The processor 802, the memory 804, the transceiver 806, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 802, the memory 804, the transceiver 806, or various combinations or components thereof may support a method for performing one or more of the operations described herein.

In some implementations, the processor 802, the memory 804, the transceiver 806, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 802 and the memory 804 coupled with the processor 802 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 802, instructions stored in the memory 804) .

For example, the processor 802 may support wireless communication at the device 800 in accordance with examples as disclosed herein. The processor 802 may be configured to operable to support a means for determining a change of network coverage state of the second UE; and transmitting an indication of the change of network coverage state to one of the following: a first UE, a third UE associated with a first positioning operation for the first UE or a network device.

The processor 802 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 802 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 802. The processor 802 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 804) to cause the device 800 to perform various functions of the present disclosure.

The memory 804 may include random access memory (RAM) and read-only memory (ROM) . The memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 802 cause the device 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 802 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 804 may include, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The I/O controller 808 may manage input and output signals for the device 800. The I/O controller 808 may also manage peripherals not integrated into the device 800. In some implementations, the I/O controller 808 may represent a physical connection or port to an external peripheral. In some implementations, the I/O controller 808 may utilize an operating system such as or another known operating system. In some implementations, the I/O controller 808 may be implemented as part of a processor, such as the processor 806. In some implementations, a user may interact with the device 800 via the I/O controller 808 or via hardware components controlled by the I/O controller 808.

In some implementations, the device 800 may include a single antenna 810. However, in some other implementations, the device 800 may have more than one antenna 810 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 806 may communicate bi-directionally, via the one or more antennas 810, wired, or wireless links as described herein. For example, the transceiver 806 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 806 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 810 for transmission, and to demodulate packets received from the one or more antennas 810. The transceiver 806 may include one or more transmit chains, one or more receive chains, or a combination thereof.

A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 810 for transmitting the amplified signal into the air or wireless medium.

A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 810 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.

FIG. 9 illustrates an example of a device 900 that supports SL WUS transmission in accordance with aspects of the present disclosure. The device 900 may be an example of a base station 102 as described herein. The device 900 may support wireless communication with one or more network entities 102, UEs 104, core networks 106 or any combination thereof. The device 900 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 902, a memory 904, a transceiver 906, and, optionally, an I/O controller 908. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .

The processor 902, the memory 904, the transceiver 906, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 902, the memory 904, the transceiver 906, or various combinations or components thereof may support a method for performing one or more of the operations described herein.

In some implementations, the processor 902, the memory 904, the transceiver 906, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 902 and the memory 904 coupled with the processor 902 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 902, instructions stored in the memory 904) .

For example, the processor 902 may support wireless communication at the device 900 in accordance with examples as disclosed herein. The processor 902 may be configured to operable to support a means for receiving one of the following: an indication of a change of network coverage state of a UE, wherein the UE is a first UE or one of at least one second UE associated with a first positioning operation for the first UE, or positioning session-related information associated with the first positioning operation or positioning request-related information; and in the case that the indication of the change of network coverage state of the UE is received, determining a network device-dependent positioning operation or a network device-independent positioning operation for the first UE; or in the case that the positioning request-related information or the positioning session-related information is received, performing a second positioning operation for the first UE based on the positioning request-related information or the positioning session-related information.

The processor 902 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 902 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 902. The processor 902 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 904) to cause the device 900 to perform various functions of the present disclosure.

The memory 904 may include random access memory (RAM) and read-only memory (ROM) . The memory 904 may store computer-readable, computer-executable code including instructions that, when executed by the processor 902 cause the device 900 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 902 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 904 may include, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The I/O controller 908 may manage input and output signals for the device 900. The I/O controller 608 may also manage peripherals not integrated into the device 900. In some implementations, the I/O controller 908 may represent a physical connection or port to an external peripheral. In some implementations, the I/O controller 908 may utilize an operating system such as or another known operating system. In some implementations, the I/O controller 908 may be implemented as part of a processor, such as the processor 906. In some implementations, a user may interact with the device 900 via the I/O controller 908 or via hardware components controlled by the I/O controller 908.

In some implementations, the device 900 may include a single antenna 910. However, in some other implementations, the device 900 may have more than one antenna 910 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 906 may communicate bi-directionally, via the one or more antennas 910, wired, or wireless links as described herein. For example, the transceiver 906 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 906 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 910 for transmission, and to demodulate packets received from the one or more antennas 910. The transceiver 906 may include one or more transmit chains, one or more receive chains, or a combination thereof.

A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 610 for transmitting the amplified signal into the air or wireless medium.

A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 910 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.

FIG. 10 illustrates an example of a processor 1000 that supports SL WUS transmission in accordance with aspects of the present disclosure. The processor 1000 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 1000 may include a controller 1002 configured to perform various operations in accordance with examples as described herein. The processor 1000 may optionally include at least one memory 1004, such as L1/L2/L3 cache. Additionally, or alternatively, the processor 1000 may optionally include one or more arithmetic-logic units (ALUs) 1006. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) . In some example embodiments of the present disclosure, the processor 1000 may be included in the first user equipment (UE) (for example, UE 104-1 as illustrated in FIG. 2) .

The processor 1000 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 1000) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .

The controller 1002 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 800 to cause the processor 1000 to support various operations of a first UE 104-1 in accordance with examples as described herein. For example, the controller 1002 may operate as a control unit of the processor 1000, generating control signals that manage the operation of various components of the processor 1000. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

The controller 1002 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 1004 and determine subsequent instruction (s) to be executed to cause the processor 1000 to support various operations in accordance with examples as described herein. The controller 1002 may be configured to track memory address of instructions associated with the memory 1004. The controller 1002 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 1002 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 1000 to cause the processor 1000 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 1002 may be configured to manage flow of data within the processor 1000. The controller 1002 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 1000.

The memory 1004 may include one or more caches (e.g., memory local to or included in the processor 1000 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 1004 may reside within or on a processor chipset (e.g., local to the processor 1000) . In some other implementations, the memory 1004 may reside external to the processor chipset (e.g., remote to the processor 1000) .

The memory 1004 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1000, cause the processor 1000 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 1002 and/or the processor 1000 may be configured to execute computer-readable instructions stored in the memory 1004 to cause the processor 1000 to perform various functions. For example, the processor 1000 and/or the controller 1002 may be coupled with or to the memory 1004, and the processor 1000, the controller 1002, and the memory 1004 may be configured to perform various functions described herein. In some examples, the processor 1000 may include multiple processors and the memory 1004 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

The one or more ALUs 1006 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 1006 may reside within or on a processor chipset (e.g., the processor 1000) . In some other implementations, the one or more ALUs 1006 may reside external to the processor chipset (e.g., the processor 1000) . One or more ALUs 1006 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 1006 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 1006 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 800 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 1006 to handle conditional operations, comparisons, and bitwise operations.

The processor 1000 may support wireless communication in accordance with examples as disclosed herein. The processor 1000 may be configured to or operable to support a means for obtaining a change of network coverage state of a UE, wherein the UE is the first UE or one of at least one second UE associated with a first positioning operation for the first UE; and transmitting, to a third UE associated with the first positioning operation or a network device, an indication of the change of network coverage state of the UE.

FIG. 9 illustrates an example of a processor 1100 that supports SL WUS transmission in accordance with aspects of the present disclosure. The processor 1100 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 1100 may include a controller 1102 configured to perform various operations in accordance with examples as described herein. The processor 1100 may optionally include at least one memory 1104, such as L1/L2/L3 cache. Additionally, or alternatively, the processor 1100 may optionally include one or more arithmetic-logic units (ALUs) 1106. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) . In some example embodiments of the present disclosure, the processor 1100 may be included in the second user equipment (UE) (for example, UE 104-2 as illustrated in FIG. 2) .

The processor 1100 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 1100) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .

The controller 1102 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 1100 to cause the processor 1100 to support various operations of a second UE 104-2 in accordance with examples as described herein. For example, the controller 1102 may operate as a control unit of the processor 1100, generating control signals that manage the operation of various components of the processor 1100. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

The controller 1102 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 1104 and determine subsequent instruction (s) to be executed to cause the processor 1100 to support various operations in accordance with examples as described herein. The controller 1102 may be configured to track memory address of instructions associated with the memory 1104. The controller 1102 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 1102 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 1100 to cause the processor 1100 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 1102 may be configured to manage flow of data within the processor 1100. The controller 1102 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 1100.

The memory 1104 may include one or more caches (e.g., memory local to or included in the processor 1100 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 1104 may reside within or on a processor chipset (e.g., local to the processor 1100) . In some other implementations, the memory 1104 may reside external to the processor chipset (e.g., remote to the processor 1100) .

The memory 1104 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1100, cause the processor 1100 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 1102 and/or the processor 1100 may be configured to execute computer-readable instructions stored in the memory 1104 to cause the processor 1100 to perform various functions. For example, the processor 1100 and/or the controller 1102 may be coupled with or to the memory 1104, and the processor 1100, the controller 1102, and the memory 1104 may be configured to perform various functions described herein. In some examples, the processor 1100 may include multiple processors and the memory 1104 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

The one or more ALUs 1106 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 1106 may reside within or on a processor chipset (e.g., the processor 1100) . In some other implementations, the one or more ALUs 1106 may reside external to the processor chipset (e.g., the processor 1100) . One or more ALUs 1106 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 1106 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 1106 may be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 1106 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 1106 to handle conditional operations, comparisons, and bitwise operations.

The processor 1100 may support wireless communication in accordance with examples as disclosed herein. The processor 1100 may be configured to or operable to support a means for determining a change of network coverage state of the second UE; and transmitting an indication of the change of network coverage state to one of the following: a first UE, a third UE associated with a first positioning operation for the first UE or a network device.

FIG. 12 illustrates an example of a processor 1200 that supports SL WUS transmission in accordance with aspects of the present disclosure. The processor 1200 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 1200 may include a controller 1202 configured to perform various operations in accordance with examples as described herein. The processor 1200 may optionally include at least one memory 1204, such as L1/L2/L3 cache. Additionally, or alternatively, the processor 1200 may optionally include one or more arithmetic-logic units (ALUs) 1206. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) . In some example embodiments of the present disclosure, the processor 1200 may be included in a base station (BS) which configures or preconfigures the first and second UE 104-1 and 104-2.

The processor 1200 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 1200) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .

The controller 1202 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 1200 to cause the processor 1200 to support various operations of a base station 102 in accordance with examples as described herein. For example, the controller 1202 may operate as a control unit of the processor 1200, generating control signals that manage the operation of various components of the processor 1200. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

The controller 1202 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 1204 and determine subsequent instruction (s) to be executed to cause the processor 1200 to support various operations in accordance with examples as described herein. The controller 1202 may be configured to track memory address of instructions associated with the memory 1204. The controller 1202 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 1202 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 1200 to cause the processor 1200 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 1202 may be configured to manage flow of data within the processor 1200. The controller 1202 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 1200.

The memory 1204 may include one or more caches (e.g., memory local to or included in the processor 1200 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 1204 may reside within or on a processor chipset (e.g., local to the processor 1200) . In some other implementations, the memory 1204 may reside external to the processor chipset (e.g., remote to the processor 1200) .

The memory 1204 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1200, cause the processor 1200 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 1202 and/or the processor 1200 may be configured to execute computer-readable instructions stored in the memory 1204 to cause the processor 1200 to perform various functions. For example, the processor 1200 and/or the controller 1202 may be coupled with or to the memory 1204, and the processor 1200, the controller 1202, and the memory 1204 may be configured to perform various functions described herein. In some examples, the processor 1200 may include multiple processors and the memory 1204 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

The one or more ALUs 1206 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 1206 may reside within or on a processor chipset (e.g., the processor 1200) . In some other implementations, the one or more ALUs 1206 may reside external to the processor chipset (e.g., the processor 1200) . One or more ALUs 1206 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 1206 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 1206 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 1206 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 1206 to handle conditional operations, comparisons, and bitwise operations.

The processor 1200 may support wireless communication in accordance with examples as disclosed herein. The processor 1200 may be configured to or operable to support a means for receiving one of the following: an indication of a change of network coverage state of a UE, wherein the UE is a first UE or one of at least one second UE associated with a first positioning operation for the first UE, or positioning session-related information associated with the first positioning operation or positioning request-related information; and in the case that the indication of the change of network coverage state of the UE is received, determining a network device-dependent positioning operation or a network device-independent positioning operation for the first UE; or in the case that the positioning request-related information or the positioning session-related information is received, performing a second positioning operation for the first UE based on the positioning request-related information or the positioning session-related information.

FIG. 13 illustrates a flowchart of a method 1300 that supports SL WUS transmission in accordance with aspects of the present disclosure. The operations of the method 1300 may be implemented by a device or its components as described herein. For example, the operations of the method 1300 may be performed by a first UE 104-1 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

At 1310, the method may include performing, to a second UE (for example, the second UE 104-2 as illustrated in FIG. 2) , a sidelink (SL) transmission (for example, the SL transmission 201 as illustrated in FIG. 2) for requesting an SL wake up signal (WUS) transmission from the second UE. The operations of 1310 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1310 may be performed by a device as described with reference to FIGS. 1A and 2.

At 1320, the method may include monitoring the SL WUS transmission from the second UE. The operations of 1320 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1320 may be performed by a device as described with reference to FIGS. 1A and 2.

At 1330, the method may include determining, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration. The operations of 1330 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1330 may be performed by a device as described with reference to FIGS. 1A and 2.

FIG. 14 illustrates a flowchart of a method 1400 that supports SL WUS transmission with aspects of the present disclosure. The operations of the method 1400 may be implemented by a device or its components as described herein. For example, the operations of the method 1400 may be performed by a second UE 104-2 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

At 1410, the method may include receiving, at the second UE and from a first UE (for example, the first UE 104-1 as illustrated in FIG. 2) , a sidelink (SL) transmission (for example, SL transmission 201 as illustrated in FIG. 2) for requesting an SL wake up signal (WUS) transmission from the second UE. The operations of 1410 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1410 may be performed by a device as described with reference to FIGS. 1A and 2.

At 1420, the method may include providing, to the first UE and through an operation related to the SL WUS transmission, an indication of whether to transmit sidelink control information (SCI) to the first UE in a wake up duration of the first UE. The operations of 1420 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1420 may be performed by a device as described with reference to FIGS. 1A and 2.

FIG. 15 illustrates a flowchart of a method 1500 that supports SL WUS transmission in accordance with aspects of the present disclosure. The operations of the method 1500 may be implemented by a device or its components as described herein. For example, the operations of the method 1500 may be performed by a base station as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

At 1510, the method may include transmitting, to a first user equipment (UE) (for example, the first UE 104-1 as illustrated in FIG. 2) , a mapping rule between a sidelink (SL) transmission (for example, SL transmission 201 as illustrated in FIG. 2) and an associated resource for SL wake up signal (WUS) transmission. Here, the sidelink transmission is a request for an SL wake up signal (WUS) transmission from a second UE (for example, the second UE 104-2 as illustrated in FIG. 2) . The operations of 1510 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1510 may be performed by a device as described with reference to FIGS. 1A and 2.

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

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

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.

As used herein, including in the claims, an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A first user equipment (UE) comprising:

a processor; and

a transceiver coupled to the processor,

wherein the processor is configured to:

perform, via the transceiver and to a second UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE;

monitor, via the transceiver, the SL WUS transmission from the second UE; and

determine, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration.
The first UE of claim 1, wherein the SL transmission indicates one of the following:

a starting point and a length of the wake up on duration, a discontinuous reception (DRX) configuration or pre-configuration information, an index of the DRX configuration or pre-configuration information, a gap between the SL transmission and the starting point of the wake up duration or DRX on duration, a gap between the SL WUS transmission and the starting point of the wake up duration or DRX on duration;

a service, a service ID, a group, a group ID, a destination, a destination ID, a source, or a source ID of the first UE;

a resource pool index or ID of the DRX configuration or pre-configuration information, a bandwidth part (BWP) of the DRX configuration or pre-configuration information, or a carrier index or ID of the DRX configuration or pre-configuration information; or

an SL WUS request indication and an SCI format.
The first UE of claim 2, wherein the SCI format comprises a second stage SCI format.
The first UE of claim 1, wherein the SL transmission indicates a time slot for monitoring the SL WUS transmission, the time slot is after the SL transmission and before the wake up duration, and wherein monitoring the SL WUS transmission comprises:

monitoring the SL WUS transmission within the time slot.
The first UE of claim 1, wherein the SL transmission indicates one of the following:

an acknowledgement (ACK) only resource which is associated with the SL transmission resource and used for the SL WUS transmission;

an ACK /negative ACK (NACK) resource which is associated with the SL transmission resource and used for the SL WUS transmission; or

a reserved resource for the SL WUS transmission.
The first UE of claim 5, wherein determining whether to perform the SCI monitoring in the wake up duration comprises:

in the case that an ACK is received from the second UE on the ACK only resource, determining to perform the SCI monitoring in the wake up duration or turning to active state in the wake up duration.
The first UE of claim 5, wherein determining whether to perform the SCI monitoring in the wake up duration comprises:

in the case that an ACK is not received from the second UE on the ACK only resource, determining not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration.
The first UE of claim 5, wherein determining whether to perform the SCI monitoring in the wake up duration comprises:

in the case that an ACK is received from the second UE on the ACK/NACK resource, determining to perform the SCI monitoring in the wake up duration or turning to active state in the wake up duration.
The first UE of claim 5, wherein determining whether to perform the SCI monitoring in the wake up duration comprises:

in the case that an NACK is received from the second UE on the ACK/NACK resource, determining not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration.
The first UE of claim 5, wherein determining whether to perform the SCI monitoring in the wake up duration comprises:

in the case that an ACK or NACK is not received from the second UE on the ACK/NACK resource, determining not to perform the SCI monitoring in the wake up duration or turning to inactive state in the wake up duration.
The first UE of claim 5, wherein the SL WUS transmission is transmitted on a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH) on the reserved resource.
The first UE of claim 1, wherein the processor is further configured to:

retransmit, via the transceiver, the SL transmission to the second UE in the case that the SL WUS transmission is not received from the second UE, or

perform blind retransmission of the SL transmission.
The first UE of claim 1, wherein:

the frequency resource for the SL WUS transmission is configured or preconfigured based on a bitmap sequence per resource block (RB) or per sub-channel; and

the frequency resource for the SL WUS transmission is within a physical sidelink feedback channel (PSFCH) region.
The first UE of claim 1, wherein the processor is further configured to:

select randomly at least one resource for the SL transmission.
The first UE of any of claims 1 to 14, wherein an association between the SL transmission resource and the SL WUS transmission resource is configured or preconfigured by a network device.
A processor for wireless communication, comprising:

at least one memory; and

a controller coupled with the at least one memory and configured to cause the controller to:

output, at a first user equipment (UE) to a second UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE;

monitor the SL WUS transmission from the second UE; and

determine, based on the monitoring of the SL WUS transmission, whether to perform sidelink control information (SCI) monitoring in a wake up duration.
A second user equipment (UE) comprising:

a processor; and

a transceiver coupled to the processor,

wherein the processor is configured to:

receive, via the transceiver and from a first UE, a sidelink (SL) transmission for requesting an SL wake up signal (WUS) transmission from the second UE; and

provide, to the first UE and through an operation related to the SL WUS transmission, an indication of whether to transmit sidelink control information (SCI) to the first UE in a wake up duration of the first UE.
A base station (BS) comprising:

a processor; and

a transceiver coupled to the processor,

wherein the processor is configured to:

transmit, to a first user equipment (UE) , a mapping rule between a sidelink (SL) transmission and an associated resource for SL wake up signal (WUS) transmission, wherein the sidelink transmission is a request for an SL wake up signal (WUS) transmission from a second UE.
The base station (BS) of claim 18, wherein the processor is further configured to:

transmit, to the first UE, configuration information indicative of a frequency resource for SL WUS, wherein the frequency resource is located within a physical sidelink feedback channel (PSFCH) region and indicated by a bitmap sequence per resource block (RB) or per sub-channel.
A method performed by a base station (BS) , the method comprising:

transmitting, to a first user equipment (UE) , a mapping rule between a sidelink (SL) transmission and an associated resource for SL wake up signal (WUS) transmission, wherein the sidelink transmission is a request for an SL wake up signal (WUS) transmission from a second UE.