Low power radio techniques with user equipment cooperation
Patent Information
- Application Number
- PCT/CN2025/085213
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025085213_01102026_PF_FP_ABST
Abstract
Description
LOW POWER RADIO TECHNIQUES WITH USER EQUIPMENT COOPERATIONTECHNICAL FIELD
[0001] This disclosure relates generally to wireless communication, and more specifically to systems, devices, methods, and techniques associated with low power radio techniques with user equipment cooperation. DESCRIPTION OF THE RELATED TECHNOLOGY
[0002] Communication systems are deployed to provide communication services such as voice, video, packet data, messaging, or broadcast, among others. A communication system may include a wireless communication network (such as a radio access network (RAN) ) that supports communication between wireless communication devices such as network entities (such as base stations) , client devices (such as one or more user equipments (UEs) ) , and others. Such devices may communicate with one another using a variety of protocols (such as radio access technologies (RATs)) , including those of cellular-based systems such as fourth generation (4G) systems (such as Long Term Evolution (LTE) systems) , fifth generation (5G) systems (such as 5G New Radio (5G-NR) systems) , and sixth generation (6G) systems. A wireless communication network may support communication by implementing system resources (such as frequency resources, time resources, spatial resources) in accordance with a wireless communication protocol.SUMMARY
[0003] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. The following is a summary of some non-limiting aspects of the disclosure:
[0004] A method for wireless communications by a first UE is described. The method may include receiving, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE, receiving, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal including a low-power wake up signal based on an activation of the second main radio at the second UE, and monitoring, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based on the low-power wake up signal.
[0005] A first UE for wireless communications is described. The first UE may include a processing system that includes processor circuitry and memory circuitry that stores code. The processing system may be configured to cause the first UE to receive, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE, receive, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal including a low-power wake up signal based on an activation of the second main radio at the second UE, and monitor, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based on the low-power wake up signal.
[0006] Another first UE for wireless communications is described. The first UE may include means for receiving, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE, means for receiving, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal including a low-power wake up signal based on an activation of the second main radio at the second UE, and means for monitoring, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based on the low-power wake up signal.
[0007] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE, receive, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal including a low-power wake up signal based on an activation of the second main radio at the second UE, and monitor, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based on the low-power wake up signal.
[0008] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, receiving the duty cycle information may include operations, features, means, or instructions for receiving the duty cycle information that indicates a set of multiple sets of duty cycle parameters.
[0009] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, monitoring for the control signaling from the network entity may include operations, features, means, or instructions for monitoring for the control signaling according to a first set of duty cycle parameters of the set of multiple sets of duty cycle parameters, receiving, during a monitoring occasion that corresponds to an on duration of the first set of duty cycle parameters, a duty cycle switching command that indicates to apply a second set of duty cycle parameters from the set of multiple sets of duty cycle parameters, and monitoring for second control signaling according to the second set of duty cycle parameters based on the duty cycle switching command.
[0010] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a control signal from the network entity that identifies a first set of duty cycle parameters from the set of multiple sets of duty cycle parameters, and where the monitoring for the control signaling from the network entity may be according to the first set of duty cycle parameters.
[0011] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, receiving the duty cycle information may include operations, features, means, or instructions for receiving a control signal that indicates the duty cycle information, where the control signal may be an RRC signal or a medium access control (MAC) control element (CE) .
[0012] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, receiving the duty cycle information may include operations, features, means, or instructions for receiving the duty cycle information that indicates a periodicity, a starting monitoring occasion, a monitoring occasion length, a duty cycle duration, or any combination thereof, for monitoring for the control signaling from the network entity.BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 shows an example of a wireless communication system.
[0014] Figure 2 shows an example of a signaling diagram that supports low power radio techniques with user equipment (UE) cooperation.
[0015] Figure 3 shows an example of a duty cycle switching configuration that supports low power radio techniques with UE cooperation.
[0016] Figure 4 shows an example of a process flow that supports low power radio techniques with UE cooperation.
[0017] Figure 5 shows a block diagram of a processing system that supports low power radio techniques with UE cooperation.
[0018] Figure 6 shows a diagram of a system including a device that supports low power radio techniques with UE cooperation.
[0019] Figure 7 shows a flowchart illustrating methods that support low power radio techniques with UE cooperation.
[0020] Details of aspects and advantages of the subject matter in this disclosure are set forth in the drawings and accompanying descriptions. Like reference numbers and designations in the various drawings indicate like elements.DETAILED DESCRIPTION
[0021] A communication system may include a radio access network (RAN) that supports wireless communication. Communication of a RAN may be performed in accordance with one or more radio access technologies (RATs) , including 4G, 5G, or 6G, among others, including technologies not explicitly mentioned herein. A RAT may employ access technologies (such as multiplexing technologies) including code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , single-carrier FDMA (SC-FDMA) , time division synchronous code division multiple access (TD-SCDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) , among others. A RAT may support one or more service types, including machine type communication (MTC) , massive MTC (mMTC) , Internet of Things (IoT) , narrowband IoT (NB-IoT) , reduced capability (RedCap) , enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , or public safety, among others.
[0022] To support these and other target verticals, a communication system (such as a RAN) may be designed to implement one or more of a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, spatial processing or multipath techniques, IoT or RedCap device connectivity and management, industrial connectivity, licensed and unlicensed spectrum access, sidelink or other device-to-device (D2D) direct communication (such as vehicle-to-everything (V2X) ) , frequency spectrum expansion, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, device aggregation, advanced duplex communication (such as sub-band full-duplex (SBFD) ) , multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, network energy savings (NES) , low-power signaling and radios, or artificial intelligence or machine learning (AI / ML) , among other examples.
[0023] The foregoing and other technological improvements may support use cases such as voice calls, messaging, data transfer, streaming, wireless data centers, extended reality (XR) and metaverse applications, vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage using non-terrestrial or aerial platforms, among other examples. As the demand for connectivity continues to increase, further improvements may be implemented, and other RATs, including 6G and beyond, may be introduced to enable new applications and use cases. The systems, methods, and devices described herein may enable one or more of the foregoing technologies or new technologies or support one or more of the foregoing use cases or new use cases.
[0024] In some wireless communication systems, a user equipment (UE) , such as a small form factor UE or a wearable device configured for extended reality (XR) or augmented reality (AR) applications, may be equipped with a limited quantity of antennas and may operate according to a power limit. The wireless communications system may support techniques for UE cooperation to improve throughput and reduce latency for these UEs. For example, cooperating UEs may implement techniques to add additional communication paths, share allocated bandwidth, and aggregate traffic, reducing individual power consumption.
[0025] In some cases, a small form-factor UE may cooperate with a higher-capability UE. The higher-capability UE may be equipped with a main radio and a low-power radio. A small form-factor UE, such as an XR or AR device, may not have space for an additional radio (e.g., a low-power radio or wake up radio) and may only be equipped with a main radio. The small form-factor UE may offload wake up signal (WUS) detection to the cooperating, higher-capability UE. For example, the higher-capability UE may use the low-power radio to receive a WUS (e.g., a low-power WUS (LP-WUS) ) from a network entity that is intended for the small form-factor UE, and the higher-capability UE may send the WUS to wake up the main radio of the small form-factor UE. In some cases, a UE may be unable to operate both a main radio and a low-power radio at the same time. For example, while the main radio of the higher-capability UE is active, the low-power radio of the higher-capability UE cannot work to detect the LP-WUS or may be asleep. While the low-power radio of the higher-capability UE is asleep, the network entity may be unable to wake up the small form-factor UE, as the higher-capability UE may be unable to receive a WUS using the low-power radio and send the WUS to the small form-factor UE. Once the main radio of the higher capability UE goes to sleep and the low-power radio is powered again, the higher capability UE may be able to receive and forward a WUS from the network to the small form-factor UE, but this may introduce latency to waking up the small form-factor UE.
[0026] Aspects of the subject matter described in this disclosure relate to LP-WUS signaling when a first, lower-capability UE is cooperating with a first, higher-capability UE. For example, when a low-power radio of the second UE is asleep and the second UE is using a main radio, a network entity may transmit an indication of an LP-WUS for the first UE to the main radio of the second UE. For example, the network entity may transmit a downlink control signal, such as downlink control information or a downlink medium access control (MAC) control element (CE) , to the main radio of the second UE, and the downlink control signal may indicate or include an LP-WUS for the first UE. The second UE may send the LP-WUS to the first UE to wake up the first UE, for example to receive control information from the network entity.
[0027] In some examples, the second UE may activate the main radio for an extended period of time. For example, the second UE may be configured for a radio resource management (RRM) measurement, during which the second UE may activate the main radio and power down the low-power radio. However, the second UE may be unable to receive some signaling (e.g., physical downlink shared channel (PDSCH) , physical downlink control channel (PDCCH) , or a channel state information (CSI) reference signal (CSI-RS) ) during the RRM measurement. If the second UE is configured for an RRM measurement, the second UE may be unable to receive an LP-WUS for the first UE using the main radio or the low-power radio during the RRM measurement.
[0028] Some additional aspects of the subject matter described in this disclosure relate to waking up a first, lower-capability UE that is cooperating with a second, higher-capability UE when the second UE is configured for an RRM measurement. For example, a network entity may transmit an LP-WUS to the second UE to wake up the second UE for an RRM measurement, and the network entity may transmit an LP-WUS for the first UE (e.g., transmitted to the low-power radio of the second UE) in the same occasion. The second UE may send the LP-WUS to the first UE to wake up the first UE while the second UE is performing the RRM measurement. In some examples, the first UE may be configured with duty cycle parameters for a duty cycle-based wake up. For example, the network entity may configure a duty cycle duration, an on duration, and a periodicity for the first UE to wake up while the second UE is performing an RRM measurement. If the first UE is woken up based on the second UE performing the RRM measurement, the first UE may wake up (e.g., power on and off a main radio of the first UE) according to duty cycle parameters while the second UE performs the RRM measurement.
[0029] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by transmitting an LP-WUS intended to a first, lower-capability UE to a second, higher-capability UE using control signaling, the described techniques can be used to reduce latency in waking up the first UE. In some examples, by configuring duty cycle parameters at the first, lower-capability UE, the described techniques can be used to improve throughput and save power at the first UE by enabling the first UE to receive control signaling while the second UE is performing an RRM measurement.
[0030] Figure 1 shows an example of a wireless communication system 100. The wireless communication system 100 includes a core network 150 and a RAN 120 that support communication with one or more devices, such as UEs 115. A RAN 120 may include one or more network entities 105 configured to support wireless communication with the UEs 115.
[0031] The wireless communication system 100 may support communication among network entities 105 and UEs 115 in accordance with a layered protocol stack. For example, in a user plane, communication at a bearer layer, a Packet Data Convergence Protocol (PDCP) layer, or Service Data Adaption Protocol (SDAP) layer may be Internet Protocol (IP) -based. A Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate via logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. A MAC layer also may implement error detection techniques, error correction techniques, or retransmissions. In a control plane, a Radio Resource Control (RRC) layer may provide establishment, configuration, and maintenance of an RRC connection between UEs 115 and a network entity 105 or a core network 150, supporting radio bearers for user plane data. A Physical (PHY) layer may map transport channels to physical channels.
[0032] A core network 150 may support user authentication, access authorization, tracking, IP connectivity, and other access, routing, or mobility functions (such as via network entities 105) . A core network 150 may be a 5G core (5GC) or 6G core (6GC) , and may include at least one control plane entity that manages access and mobility and at least one user plane entity that routes packets or interconnects to external networks (such as a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , a user plane function (UPF)) .
[0033] A network entity 105 may support wireless communication in accordance with one or more coverage areas 110, and may be referred to as a network element, a network node, a RAN node, or network equipment, among other nomenclature. One or more of the network entities 105 may include or may be referred to as a base station. Depending on its capabilities, a base station may be referred to as a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a 6G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology. The wireless communication system 100 may include a heterogeneous network in which different types of network entities 105 support communication for one or more coverage areas 110 using the same or different RATs.
[0034] In some examples, a network entity 105 may be implemented in an aggregated (such as monolithic, standalone) architecture, which may utilize a protocol stack that is physically or logically integrated within one network entity 105 (such as a single physical RAN node) . In some other examples, a network entity 105 may be implemented in a disaggregated architecture, which may utilize a protocol stack that is physically or logically distributed among multiple network entities 105, including in an integrated access and backhaul (IAB) network, an open RAN (O-RAN) , or a virtualized RAN (vRAN) . In a disaggregated architecture, a network entity 105 may include or be referred to as one or more of a central unit (CU) (such as CU 160) , a distributed unit (DU) (such as DU 165) , a radio unit (RU) (such as RU 170) , or a combination thereof. The wireless communication system 100 may also implement a service-based architecture that provides a modular framework in which control plane functionality and common data repositories may be delivered through a set of interconnected network functions (NFs) that may access services of other NFs.
[0035] UEs 115 may be located in a coverage area 110 of one or more network entities 105, and may include or be referred to as an access terminal, a mobile station, a client device, or a subscriber unit. A UE 115 may be, include, or be coupled with a cellular phone, a wireless modem, a tablet device, a laptop computer, a wireless local loop (WLL) station, a camera, a medical or biometric device, a wearable device, a gaming device, an entertainment device, an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Positioning System (GPS) or other positioning device, a robot or other device implementing artificial intelligence, a UE function of a network node, or any other wireless communication device or function that may communicate using a wireless medium.
[0036] The wireless communication system 100 may support various types of communication links among devices. For example, wireless communication between a network entity 105 and a UE 115 may be supported using one or more of a communication link 125 (such as a Uu interface) , which may include downlink communication from a network entity 105 to a UE 115, uplink communication from a UE 115 to a network entity 105, or both. Direct wireless communication between UEs 115 may be supported using a communication link 135 (such as a device-to-device (D2D) communication link, a sidelink, a PC5 interface) .
[0037] Communication between a network entity 105 and a core network 150 may be supported using a backhaul link 132 (such as an S1, N2, N3, NG, or other interface) . In some implementations, communication between network entities 105 may be supported using a backhaul link 132 (such as an X2, Xn, or other interface) either directly (such as directly between network entities 105) or indirectly (such as via a core network 150) . In some implementations (such as in a disaggregated architecture) , communication between a CU 160 and a DU 165 may be supported using a midhaul link 162, and communication between a DU 165 and an RU may be supported using a fronthaul link 168. A backhaul link 132, a midhaul link 162, a fronthaul link 168, or any combination thereof may be or include one or more wired links (such as an electrical link, an optical fiber link) or one or more wireless links (such as a radio link, a wireless optical link) , among other examples or combinations thereof. Wireless backhaul, midhaul, or fronthaul may be implemented via one or more IAB nodes 104, which may act as a relay using resources of an IAB donor network entity 105 (such as via a wireless link 130) .
[0038] The wireless communication system 100 may include one or more of a relay 172 that may steer or reflect signals transmitted by other entities, which may support any of the described communication links. A relay 172 may include active elements or passive elements, and may be in the form of a reconfigurable intelligent surface (RIS) . An RIS may include tunable reflecting antenna arrays or metasurfaces, which may be used to enhance coverage or efficiency in multipath environments.
[0039] Network entities 105 and UEs 115 each may include one or multiple antennas. Multiple antennas of such devices may be used to employ techniques such as transmit diversity, receive diversity, MIMO communication, or beamforming, and may be organized or structured as one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. As used herein, the term “antenna” may refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. The term “antenna panel” may refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters associated with the group of antennas. In some implementations, an antenna panel may support RF beamforming for a signal transmitted or received via an antenna port. The term “antenna module” may refer to circuitry including one or more antennas as well as one or more other components (such as filters, amplifiers, processors, beamformers) associated with integrating the antenna module into a device such as a network entity 105 or a UE 115.
[0040] Beamforming, such as directional transmission or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (such as at a network entity 105, at a UE 115) to shape or steer a beam 175 (such as an antenna beam, a transmit beam, a receive beam) along a spatial path (such as along a direction) , which may include one or more paths between a transmitting device and a receiving device. Beamforming may be achieved by combining signals communicated via multiple antenna elements of an antenna array such that signals propagating along some orientations (such as relative to the antenna array) experience constructive interference while others may experience destructive interference. Adjustments of signals communicated via the antenna elements may include a transmitting device or a receiving device applying phase offsets, amplitude offsets, or both to signals carried via (such as transmitted by, received by) antenna elements of the device, which may be defined by a beamforming weight set associated with a particular orientation (such as relative to the antenna array of the device) .
[0041] Communication resources of the wireless communication system 100 (such as of a RAN 120) may refer to a resource in the frequency domain (such as a frequency resource, an RF resource) , a resource in the time domain (such as a time resource) , a resource in the spatial domain (such as a spatial resource, a spatial layer) , or a combination thereof. The wireless communication system 100 may leverage orthogonality of such resources to convey different communications to or from different devices (such as for a communication link 125, for a communication link 135, for unicast communication, for multicast communication, for broadcast communication) .
[0042] A frequency resource may refer to a frequency or range of frequencies (such as a bandwidth, a frequency channel) of a frequency band implemented for wireless communication. For example, a frequency resource may refer to a resource of a lower frequency band (such as Frequency Range 1 (FR1) , between 425 MHz and 7.125 GHz) , a mid-band (such as Frequency Range 3 (FR3) , between 7.125 GHz and 24.25 GHz) , or an upper frequency band (such as Frequency Range 2 (FR2) , between 24.25 GHz and 71 GHz) . Communication in the upper frequency band may be referred to as millimeter wave (mmW) communication, and communication above an upper frequency band (such as between mmW and THz frequencies, between 100 GHz and 1 THz) may be referred to as sub-Terahertz (sub-THz) communication.
[0043] A frequency resource may refer to a “carrier” (such as a frequency channel) , or portion thereof, and a carrier bandwidth may be referred to as a “system bandwidth. ” A carrier may be subdivided in the frequency domain, including into subcarriers, bandwidth parts (BWPs) , or both. For example, a resource block (RB) , such as a physical resource block (PRB) , may be defined in accordance with a set of subcarriers (such as twelve consecutive subcarriers in the frequency domain) , and a BWP may be configured in accordance with a set of RBs (such as a set of contiguous RBs) .
[0044] A frequency resource may be configured to carry either downlink communication or uplink communication (such as in a frequency division duplexing (FDD) configuration) , or may be configured to carry both downlink and uplink communication (such as in a time division duplexing (TDD) configuration, in a sub-band full duplex (SBFD) configuration) . One or more numerologies for a carrier may be supported, each associated with a subcarrier spacing (SCS) and a cyclic prefix (CP) . Supported numerologies may vary by frequency range (such as FR1, FR2, FR3) , and a carrier may be divided into portions (such as BWPs) having the same or different numerologies. BWPs may be configured as uplink BWPs or downlink BWPs (such as by a network entity 105) , including in response to network conditions (such as to allocate uplink and downlink BWPs in response to traffic conditions) , device capability (such as allocating BWPs with a greater quantity of RBs to UEs 115 with relatively higher capabilities) , or both. A UE 115 may be configured with a set of multiple BWPs (such as a set of uplink BWPs, a set of downlink BWPs, or both) , and a single BWP of a set (such as an active UL BWP, an active DL BWP, or both) may be active at a given time, such that communication of a UE 115 is supported by active BWP (s) .
[0045] A time resource may refer to a duration of a frame (such as a radio frame, a frame structure) , or portion thereof. For example, a frame may span a duration of 10 ms, and each frame may be identified by a system frame number (SFN) . A frame may be subdivided in the time domain, including into subframes, slots, mini-slots, or a combination thereof. Slots or mini-slots may each include a respective quantity of symbols (such as symbol durations, symbol periods, OFDM symbols) , which may be a function of a configured CP. A duration of a symbol is a function of the SCS or frequency band of operation.
[0046] A spatial resource may refer to an antenna, an antenna direction, an antenna port, a signal direction (such as a beamforming direction) , or other resource that supports spatial orthogonality. A device (such as a network entity 105, a UE 115) may perform communications of a given frequency resource and time resource with a single spatial resource (such as communication without regard to spatial orthogonality) . Additionally, or alternatively, a device may implement multiple spatial resources to support multiple signal streams using resources that are overlapping in the time and frequency domains (such as to support MIMO techniques) .
[0047] Signals of the wireless communication system 100 (such as of a RAN 120) may be communicated using one or more resource elements (REs) , and an RE may refer to a resource that corresponds to one subcarrier in the frequency domain and one symbol in the time domain. An RE may be used to convey a modulation symbol corresponding to one or more bits of information (such as of a physical channel, of a reference signal) in accordance with a modulation scheme. For example, a quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM) technique may be implemented to communicate one or more bits that are distinguished in accordance with phase components, amplitude components, or both of a signal conveyed using a RE. A quantity of bits carried by an RE may depend on an order of the modulation scheme, and a relatively higher order may correspond to a relatively higher rate of communication. A device may support communication of REs using multiple subcarriers concurrently by implementing multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) , among others.
[0048] Physical channels may carry information using modulation symbols conveyed by corresponding REs. Physical shared channels (such as for communicating user data) may include a physical downlink shared channel (PDSCH) for communicating user data in a downlink direction and a physical uplink shared channel (PUSCH) for communicating user data in an uplink direction. Physical control channels (such as for managing communication via physical channels) may include a physical downlink control channel (PDCCH) for communicating downlink control information (DCI) and a physical uplink control channel (PUCCH) for communicating uplink control information (UCI) . A network entity 105 may indicate (such as schedule, allocate) communication resources for a UE 115 using DCI, including indicating downlink resources of a PDSCH (such as in accordance with a downlink grant) , uplink resources of a PUSCH (such as in accordance with an uplink grant) , or a combination thereof. A control region (such as a control resource set (CORESET) ) for a physical control channel may be configured in accordance with a pattern of REs in the time and frequency domains, and one or more control regions may be configured for a set of UEs. A UE 115 may monitor control regions for control information according to one or more search space sets, which may include a common search space set (such as for sending control information to one or more UEs 115) , UE-specific search space sets (such as for sending control information to a UE 115) , or a combination thereof. A physical broadcast channel (PBCH) may be used to broadcast parameters to UEs 115 to synchronize with a network entity 105 and establish communications (such as to establish a communication link 125) .
[0049] Reference signals may be communicated to establish reference characteristics (such as a frequency reference, a temporal reference, a spatial reference, a signal quality reference) between devices of a RAN 120, which may support communication using physical channels. Reference signals communicated between network entities 105 and UEs 115 may include synchronization signals (such as a primary synchronization signal (PSS) , a secondary synchronization signal (SSS)) that support temporal synchronization, channel state information-reference signals (CSI-RSs) that support evaluating downlink channel characteristics, sounding reference signals (SRSs) that support evaluating uplink channel characteristics, demodulation reference signals (DMRSs) that support demodulation, or phase tracking reference signals (PTRSs) for evaluating oscillator characteristics, among others. Network entities 105 and UEs 115 may receive and measure transmitted reference signals to support one or more of these and other functions.
[0050] The wireless communication system 100 may include multiple different types of UEs 115 or UEs 115 with different capabilities. For example, the wireless communication system 100 may include one or more higher-capability UEs and one or more lower-capability UEs 115. In some examples, a higher-capability UE may be equipped with a main radio and a low-power radio. The higher-capability UE may use the main radio for uplink and downlink communications (e.g., control and data signaling) with other devices, such as a network entity 105. The higher-capability UE may use the low-power radio to receive low-power signals, such as an LP-WUS or low-power synchronization signals (LP-SS) .
[0051] A UE 115 may monitor for an LP-WUS to determine whether to monitor for PDCCH signaling from a network entity 105. If the UE 115 detects an LP-WUS, the UE 115 may begin monitoring PDCCH. For example, the UE 115 may monitor for paging PDCCH if the UE 115 is operating in an idle or inactive mode, or the UE 115 may monitor for data scheduling PDCCH if the UE 115 is operating in a connected mode. LP-WUS techniques may reduce UE power consumption by reducing how much a UE 115 monitors PDCCH. An LP-WUS may be generated by on-off keying (OOK) modulation, and the UE 115 may detect the LP-WUS with a low-power envelope detector. Decoding PDCCH may consume significantly more power than detecting an LP-WUS. Using LP-WUS to trigger PDCCH monitoring may save more power at the UE 115, especially for sporadic data scheduling.
[0052] In some examples, a UE 115 may monitor for an LP-WUS using the low-power radio while a main radio of the UE 115 is put into a sleep mode for power saving. If the UE 115 detects an LP-WUS, the UE 115 may wake up the main radio to monitor for PDCCH. For example, an LP-WUS may trigger the UE 115 for PDCCH monitoring, and the UE 115 may turn on the main radio and use the main radio to monitor PDCCH.
[0053] A lower-capability UE may be equipped with a limited quantity of antennas. In some examples, the lower-capability UE may operate according to a power limit. In some examples, a wearable device, an XR device, or an AR device may be an example of a lower-capability UE. Some small form-factor UEs (e.g., some AR glasses, watches, etc. ) may not be equipped with four receive antennas, which may be used for operation on certain radio frequency spectrum bands. In some examples, some lower-capability UEs (e.g., wearable UEs, small form-factor UEs) may cooperate to improve uplink and downlink throughput and reduce latency while enabling the lower-capability UEs to operate within a power limit.
[0054] In some cases, UE cooperation may be between an anchor UE and a companion UE. The anchor UE may have two connections, including one direct connection with the network and one indirect connection through the companion UE. The anchor UE may support full stack Uu communication with the network. The companion UE may have split architecture, including Layer 3, Layer 2, a higher Physical layer, a low Physical layer, or any combination thereof. The anchor UE and the companion UE may establish a communication link (e.g., a co-op link) , which the anchor UE and companion UE may use for cooperation and to communicate. In some examples, the anchor UE and the companion UE may communicate via an ultra-wide band modem or a sidelink modem, or both. For example, the anchor UE and the companion UE may communicate using NR communications, LTE communications, or Wi-Fi communications via the communication link. In some examples, the anchor UE or companion UE may be associated with (e.g., communicate with) one or more additional UEs, such as lower-capability UEs (e.g., AR glasses, watches, smartphones, etc. )
[0055] In some cases, a lower-capability UE, such as a small form-factor UE, may cooperate with a higher-capability UE. The higher-capability UE may be equipped with a main radio and a low-power radio. A small form-factor UE, such as an XR or AR device, may not have space for an additional radio (e.g., a low-power radio or wake up radio) and may only be equipped with a main radio. For example, a low-power radio (e.g., a low-power wake up radio (LP-WUR) may use separate transceivers from a main radio, such that some small form-factor UEs are not big enough to include a low-power radio.
[0056] A small form-factor UE may offload LP-WUS detection to the cooperating, higher-capability UE. For example, the higher-capability UE may use the low-power radio to receive an LP-WUS (e.g., a low-power WUS (LP-WUS) ) from a network entity 105 that is intended for the small form-factor UE, and the higher-capability UE may send the LP-WUS to the main radio of the small form-factor UE. For example, the small form-factor UE may only be deployed with a main radio chain, and the higher-capability UE may send a radio link protocol (RLP) WUS to wake up the main radio of the small form-factor UE. The higher-capability UE may send the LP-WUS to the main radio of the small form-factor UE via physical layer signaling, sidelink signaling, Wi-Fi signaling. In some cases, the small form-factor UE may include a Wi-Fi modem or a wake up radio for a Wi-Fi WUS. The Wi-Fi wake up radio may use a low-power receiver. The Wi-Fi wake up radio may not be blocked by a Uu main radio, as the Wi-Fi wake up radio and the Uu main radio may operate on different frequencies or different radio frequency spectrum bands.
[0057] In some wireless communications systems, a UE 115 may be unable to operate both a main radio and a low-power radio at the same time. For example, while the main radio of a higher-capability UE is active, a low-power radio of the higher-capability UE may be asleep. While the low-power radio of the higher-capability UE is asleep, the network entity may be unable to wake up the small form-factor UE, as the higher-capability UE may be unable to receive a WUS using the low-power radio and send the WUS to the small form-factor UE. For example, when the higher-capability UE is transmitting or receiving data using the main radio, the low-power radio of the higher-capability UE may be asleep and unable to detect LP-WUS for the higher-capability UE or the lower-capability UE. The network may be unable to directly wake up the lower-capability UE, as the lower-capability UE may not be deployed with a low-power radio. For example, the lower-capability UE may rely on the higher-capability UE to detect an LP-WUS for the lower-capability UE. Once the main radio of the higher capability UE goes to sleep and the low-power radio is powered again, the higher capability UE may be able to receive and forward a WUS from the network to the small form-factor UE, but this may introduce latency to waking up the small form-factor UE. This latency introduction may reduce user experience, such as for low-latency applications such as XR applications or AR applications.
[0058] The wireless communication system 100 may support techniques for LP-WUS signaling when a first, lower-capability UE 115 is cooperating with a first, higher-capability UE 115. For example, when a low-power radio of the second UE 115 is asleep and the second UE 115 is using a main radio, a network entity 105 may transmit an indication of an LP-WUS for the first UE 115 to the main radio of the second UE 115. For example, the network entity 105 may transmit a downlink control signal, such as downlink control information or a downlink MAC CE, to the main radio of the second UE 115, and the downlink control signal may indicate or include an LP-WUS for the first UE 115. The second UE 115 may send the LP-WUS to the first UE to wake up the first UE, for example to receive control information from the network entity.
[0059] In some examples, the second UE 115 may activate the main radio for an extended period of time. For example, the second UE 115 may be configured for an RRM measurement, during which the second UE 115 may activate the main radio and power down the low-power radio. However, the second UE 115 may be unable to receive some signaling (e.g., PDSCH, PDCCH, or CSI-RS) or transmit some signaling (e.g., physical uplink shared channel (PUSCH) , physical uplink control channel (PUCCH) , or CSI) during the RRM measurement. If the second UE 115 is configured for an RRM measurement, the second UE 115 may be unable to receive an LP-WUS for the first UE 115 using the main radio or the low-power radio during the RRM measurement.
[0060] The wireless communication system 100 may support techniques to wake up a first, lower-capability UE 115 that is cooperating with a second, higher-capability UE 115 when the second UE 115 is configured for an RRM measurement. For example, a network entity 105 may transmit an LP-WUS to the second UE 115 to wake up the second UE 115 for an RRM measurement, and the network entity 105 may transmit an LP-WUS for the first UE 115 (e.g., transmitted to the low-power radio of the second UE) in the same occasion. The second UE 115 may send the LP-WUS to the first UE 115 to wake up the first UE 115 while the second UE 115 is performing the RRM measurement. In some examples, the first UE 115 may be configured with duty cycle parameters for a duty cycle-based wake up. For example, the network entity 105 may configure a duty cycle duration, an on duration, and a periodicity for the first UE 115 to wake up while the second UE 115 is performing an RRM measurement. If the first UE 115 is woken up based on the second UE 115 performing the RRM measurement, the first UE 115 may wake up (e.g., power on and off a main radio of the first UE 115) according to duty cycle parameters while the second UE 115 performs the RRM measurement.
[0061] Devices of the wireless communication system 100 may be configured to support one or more aspects of the described techniques for low power radio techniques with UE cooperation. For example, a UE 115 may include a processing system 140, and a network entity 105 may include a processing system 145, each of which may be configured to cause the respective device to perform (such as being configured as means for performing) one or more of the described operations. By configuring a processing system 140, a processing system 145, or a combination thereof in accordance with the described techniques, the communication system 100 (such as the RAN 120) may support reduced latency and increased throughput for a first UE 115 (e.g., that is equipped with a main radio) that cooperates with a second UE 115 (e.g., that is equipped with a main radio and a low-power radio) .
[0062] Figure 2 shows an example of a signaling diagram 200 that supports low power radio techniques with UE cooperation. The signaling diagram 200 may include aspects of a wireless communication system 100 described herein. For example, the signaling diagram 200 may include a network entity 105-a, a UE 115-a, and a UE 115-b, which may be examples of corresponding devices described herein.
[0063] The UE 115-a may be an example of a higher-capability UE 115. For example, the UE 115-a may be equipped with a main radio 205-a and a low-power radio 210. The UE 115-a may use the main radio 205-a for control and data communications (e.g., Uu communications, sidelink signaling, etc. ) , and the UE 115-a may use the low-power radio 210 to monitor for low-power signals, such as an LP-WUS 215.
[0064] The UE 115-b may be an example of a lower-capability UE 115. For example, the UE 115-b may be equipped with a main radio 205-b, but the UE 115-b may not be equipped with a low-power radio. The UE 115-b may be an example of a small form-factor UE, an XR device, an AR device, a wearable device, or any combination thereof.
[0065] The UE 115-a and the UE 115-b may implement techniques for UE cooperation. For example, the UE 115-b may offload LP-WUS detection to the UE 115-a, as the UE 115-a may be equipped with the low-power radio 210. While the low-power radio 210 of the UE 115-a is powered on, the UE 115-a may monitor for an LP-WUS 215 for the UE 115-b. If the UE 115-a detects an LP-WUS 215 for the UE 115-b, the UE 115-a may send the LP-WUS 215 to the UE 115-b to wake up the UE 115-b. The UE 115-a may send the LP-WUS 215 via sidelink signaling (e.g., via PC5) , Wi-Fi signaling, downlink signaling, or any combination thereof.
[0066] In some cases, the main radio 205-a and the low-power radio 210 of the UE 115-a may not be able to operate simultaneously. For example, while the UE 115-a is transmitting or receiving signaling using the main radio 205-a, the low-power radio 210 may be unable to detect an LP-WUW 215 for the UE 115-a or the UE 115-b.
[0067] The signaling diagram 200 may support techniques for the network entity 105-a to transmit an LP-WUS 215 via a downlink control signal to the UE 115-a. The UE 115-a may receive the LP-WUS 215 using the main radio 205-a, and the UE 115-a may wake up the UE 115-b based on receiving the LP-WUS 215 using the main radio 205-a. By indicating the LP-WUS 215 using a downlink control signal, the UE 115-a may receive and forward the LP-WUS 215 to the UE 115-b, such that the UE 115-b can wake up and avoid missing paging or data signaling from the network entity 105-a.
[0068] For example, when the main radio 205-a of the UE 115-a is active (e.g., to communicate date) , an LP-WUS 215 for the UE 115-b may be incorporated into a PDCCH signal (e.g., DCI, MAC CE) for the UE 115-a. In some examples, the LP-WUS 215 may be transmitted via the PDCCH signal. Additionally, or alternatively, the LP-WUS 215 may be indicated via the PDCCH signal. For example, a bit field in downlink control information (DCI) or MAC CE may indicate the LP-WUS 215 for the UE 115-b. In some examples, a non-scheduled downlink control information (e.g., DCI without scheduling information) for the UE 115-a may be used to deliver (e.g., indicate or include) the LP-WUS 215 for the UE 115-b. For example, a value of a bit field may be set to one to indicate that the downlink control information is used to indicate the LP-WUS 215 for the UE 115-b (e.g., and other bit fields may be set to zero) . In some examples, the LP-WUS for the UE 115-b may be multiplexed into a non-scheduled downlink control information with other indications. For example, the LP-WUS 215 for the UE 115-b may be multiplexed with one-shot hybrid automatic request (HARQ) feedback. In some examples, the network entity 105-a may transmit a MAC CE to the UE 115-a that indicates the LP-WUS 215 for the UE 115-b. For example, a MAC CE may be configured for the UE 115-a, and the MAC CE may deliver (e.g., include or indicate) the LP-WUS 215 for the UE 115-b to the UE 115-a.
[0069] When the UE 115-a receives the LP-WUS 215 or the indication of the LP-WUS 215, the UE 115-a may send the LP-WUS 215 to the UE 115-b. In some examples, the UE 115-a may send the LP-WUS 215 to the UE 115-b via a different radio access technology, such as transmitting a WUS via Wi-Fi, PC5, or the like. In some examples, the UE 115-a may send the LP-WUS 215 to the UE 115-b via sidelink signaling.
[0070] In some examples, the main radio 205-a of the UE 115-a may be active to perform RRM measurements. While the main radio 205-a of the UE 115-a is active to perform RRM measurements, the UE 115-a may be unable to receive some downlink signaling (e.g., PDSCH signaling, PDCCH signaling, CSI-RS) , and the UE 115-a may be unable to transmit some uplink signaling (e.g., PUSCH signaling, PUCCH signaling, CSI) . Therefore, the UE 115-a may be unable to receive the LP-WUS using either the main radio 205-a or the low-power radio 210.
[0071] The signaling diagram 200 may support techniques to wake up the main radio 205-b of the UE 115-b when the UE 115-a is performing an RRM measurement. For example, the network entity 105-a may transmit an LP-WUS 215 for the UE 115-b a same occasion as an LP-WUS for the UE 115-a. For example, when the network entity 105-a transmits an LP-WUS 215 to the UE 115-a to wake up the main radio 205-a of the UE 115-a for an RRM measurement, the network entity 105-a also may transmit an LP-WUS 215 in the same LP-WUS occasion to wake up the UE 115-b. In some examples, the UE 115-a may send the LP-WUS 215 to the UE 115-b to wake up the main radio 205-b of the UE 115-b before the UE 115-a starts the RRM measurement.
[0072] In some examples, the UE 115-b may keep the main radio 205-b awake while the UE 115-a performs the RRM measurement using the main radio 205-a. This may enable the UE 115-b to receive control signaling from the network entity 105-a while the UE 115-a performs the RRM measurement.
[0073] In some examples, the network entity 105-a may transmit a group-common WUS to wake up the UE 115-a and the UE 115-b. The network entity 105-a may determine RRM occasions for the UE 115-a, and the network entity 105-a may transmit a group-common WUS to wake up the main radio 205-a of the UE 115-a and the main radio 205-b of the UE 115-b prior to an RRM occasion for the UE 115-a. A group-common identifier may be used to scramble the group-common WUS. The UE 115-a may determine that a WUS is also for the UE 115-b based on the WUS being scrambled with the group-common identifier.
[0074] In some examples, the UE 115-b may be configured (e.g., via control signaling from the network entity 105-a) with duty cycle information, and the UE 115-b may wake up the main radio 205-b according to the duty cycle information. The network entity 105-a may transmit, to the UE 115-b, a control message indicating or including a duty cycle configuration 220. For example, while the main radio 205-a of the UE 115-a is active (e.g., to perform an RRM measurement) , the UE 115-b may turn on and off the main radio 205-b according to the duty cycle information to monitor for control signaling from the network entity 105-a. In some examples, the network entity 105-a may configure the UE 115-b with the duty cycle information (e.g., in advance or prior to the RRM measurement of the UE 115-a) via control signaling, such as RRC signaling or a MAC CE. In some examples, the network entity 105-a may configure the UE 115-b to operate according to the duty cycle information via transmitting PDCCH signaling or a MAC CE to the UE 115-b. The network entity 105-a may trigger duty cycle operation for the UE 115-b before the network entity 105-a wakes up the main radio 205-a of the UE 115-a (e.g., for RRM measurement or data communication) .
[0075] The duty cycle information may include parameters for the UE 115-b to operate the main radio 205-b. For example, the duty cycle information may include a periodicity, a starting occasion (e.g., a starting monitoring occasion) , a length of each occasion, and a duration of the duty cycle. The UE 115-b may toggle a wake-up and sleep state according to the configured duty cycle while the main radio 205-a of the UE 115-a is active.
[0076] In some examples, the network entity 105-a may configure (e.g., via control signaling) the UE 115-b with multiple sets of duty cycle parameters. For example, the network entity 105-a may configure the UE 115-b with multiple duty cycle patterns. In an example, a first duty cycle pattern may include four on durations and six off durations within a time period, and a second duty cycle pattern may include eight on durations and two off durations within the same duration. Operating according to the first duty cycle pattern may consume less power at the UE 115-b than operating according to the second duty cycle pattern, as the UE 115-b may operate the main radio 205-b for less time with the first duty cycle pattern.
[0077] The network entity 105-a may select and indicate (e.g., via control signaling) a duty cycle pattern to the UE 115-b based on downlink traffic metrics. For example, duty cycle parameters for the UE 115-b may be based on periodicity, latency, or reliability of downlink signaling. If downlink signaling (e.g., PDCCH or PDSCH signaling) for the UE 115-b is infrequent, the UE 115-b may be configured to use a duty cycle where the main radio 205-b is active less often. If downlink signaling for the UE 115-b is frequent, the UE 115-b may be configured to use a duty cycle where the main radio 205-b is active more often.
[0078] In some examples, the network entity 105-a may configure the UE 115-b with the multiple sets of duty cycle parameters via semi-static signaling, such as RRC signaling. In some examples, the network entity 105-a may indicate for the UE 115-b to switch between sets of duty cycle parameters via downlink control information or a MAC CE. In some examples, the network entity 105-a may indicate a set of duty cycle parameters to the UE 115-b while the main radio 205-b of the UE 115-b is active, for example during an on duration of an ongoing duty cycle. Additionally, or alternatively, the network entity 105-a may indicate a set of duty cycle parameters for the UE 115-b to the UE 115-a, and the UE 115-a may indicate the set of duty cycle parameters to the UE 115-b. For example, the network entity 105-a may configure the UE 115-b to switch sets of duty cycle parameters while the main radio 205-b of the UE 115-b is active, or the network entity 105-a may transmit an indication that the UE 115-b is to switch sets of duty cycle parameters to the UE 115-a, and the UE 115-a may forward the indication to the UE 115-b. The network entity 105-a may determine how to indicate a set of duty cycle parameters to the UE 115-b based on a state of the main radio 205-b of the UE 115-a, current duty cycle parameters of the UE 115-b, a state of the main radio 205-a of the UE 115-a, or any combination thereof. Some additional aspects for configuring a lower-capability UE 115, such as the UE 115-b, to operate according to a duty cycle are described in more detail with reference to Figure 3.
[0079] Figure 3 shows an example of a duty cycle configuration 300 that supports low power radio techniques with UE cooperation. The duty cycle configuration 300 may implement aspects of a wireless communication system 100 and a signaling diagram 200 described herein.
[0080] A first, lower-capability UE 115 may cooperate with a second, higher-capability UE 115 using the techniques described herein. For example, a network entity 105 may transmit an LP-WUS to the second UE 115, and the second UE 115 may send the LP-WUS to the first UE 115 to wake up a main radio 310 of the first UE 115. The network entity 105 may transmit the LP-WUS or an indication of the LP-WUS to a main radio 305 of the second UE 115 (e.g., if the main radio 305 is an active state and a low-power radio of the second UE 115 is in a sleep state) or a low-power radio of the second UE 115 (e.g., if the low-power radio of the second UE 115 is an active state and the main radio 305 of the second UE 115 is in a sleep state) . An active state may, in some examples, be referred to as powered on, enabled, or awake. A sleep state may, in some examples, be referred to as powered off, disabled, or asleep.
[0081] The second UE 115 may perform an RRM measurement or an RRM procedure, where the main radio 305 is in an active state but is unable to be used for control or data signaling. Therefore, the second UE 115 may be unable to receive an LP-WUS for the first UE 115 using either the main radio 305 or the low-power radio.
[0082] In some examples, a network entity 105 may transmit an LP-WUS 315 to turn on the main radio 310 of the first UE 115 while the main radio 305 of the second UE 115 is turned on to perform the RRM procedure. In some examples, the network entity 105 may transmit an LP-WUS 315 for each of the first UE 115 and the second UE 115. In some other examples, the network entity 105 may transmit a group-common WUS that is for both UEs 115.
[0083] For a monitoring configuration 335-a, the first UE 115 may receive the LP-WUS 315 (e.g., from the second UE 115) and turn on the main radio 310 of the first UE 115 while the second UE 115 performs the RRM measurement procedure. The monitoring configuration 335 may show an example of the first UE 115 keeping the main radio 310 of the first UE 115 turned on (e.g., in the active state) for the entire RRM measurement procedure. When the RRM measurement procedure is finished, the first UE 115 may turn off the main radio 310 of the first UE 115.
[0084] In some examples, the network entity 105 may configure the first UE 115 with duty cycle information for powering on the main radio 310 of the first UE 115 while the second UE 115 performs the RRM measurement. The network entity 105 may configure the first UE 115 with one or more sets of duty cycle parameters. For example, a monitoring configuration 335-b may correspond to the first UE 115 operating the main radio 310 according to a first set of duty cycle parameters, and a monitoring configuration 335-c may correspond to the first UE 115 operating the main radio 310 according to a second set of duty cycle parameters.
[0085] A set of duty cycle parameters may include, for example, information for a duty cycle duration 320, a periodicity 325, an on duration 330, a starting occasion (e.g., a starting monitoring occasion) , a length of each occasion, or any combination thereof. For example, a first set of duty cycle parameters for the monitoring configuration 335-b and a second set of duty cycle parameters for the monitoring configuration 335-c may have a same duty cycle duration 320, different on durations 330, and different periodicities 325. In some examples, the first UE 115 may be configured with duty cycle parameters to operate monitor according to the monitoring configuration 335-a.
[0086] In some examples, the network entity 105 may configure the first UE 115 with the duty cycle parameters before the RRM procedure. The network entity 105 may configure the first UE 115 with one or more sets of duty cycle parameters via RRC signaling or a MAC CE. In some examples, the network entity 105 may configure the first UE 115 to switch between sets of duty cycle parameters. For example, the network entity 105 may configure the first UE 115 to switch from a first set of duty cycle parameters (e.g., which may correspond to the monitoring configuration 335-b) to a second set of duty cycle parameters (e.g., which may correspond to the monitoring configuration 335-c) . In some examples, the network entity 105 may transmit control signaling to the first UE 115 to indicate duty cycle parameters. Additionally, or alternatively, the network entity 105 may indicate a set of duty cycle parameters to the second UE 115, and the second UE 115 may send the indication of the set of duty cycle parameters to the first UE 115.
[0087] Figure 4 shows an example of a process flow 400 that supports low power radio techniques with UE cooperation. The process flow 400 may implement aspects of a wireless communication system 100, a signaling diagram 200, a duty cycle configuration 300, or any combination thereof. For example, the process flow 400 may be implemented by a network entity 105-b, a UE 115-c, and a UE 115-d, which may be respective examples of devices described herein. The UE 115-c may be an example of a higher-capability UE. The UE 115-d may be an example of a lower-capability UE, such as a small form-factor UE.
[0088] Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, steps may include additional features not mentioned below, or further steps may be added. Although the network entity 105-b, the UE 115-c, and the UE 115-d are shown performing the operations of the process flow 400, some aspects of some operations may also be performed by one or more other wireless devices.
[0089] At 405, the network entity 105-b may transmit duty cycle information to the UE 115-d. For example, the UE 115-d may receive, from the network entity 105-b, duty cycle information for a first main radio at the UE 115-d. The duty cycle information may indicate time periods during which the UE 115-c is unable to transmit WUSs (e.g., LP-WUSs) to the UE 115-d. In some examples, the duty cycle information may indicate multiple sets of duty cycle parameters. In some examples, the UE 115-d may receive an RRC signal or a MAC CE that indicates the duty cycle information. The duty cycle information may include a periodicity, a starting monitoring occasion, a monitoring occasion length, a duty cycle duration, or any combination thereof, for each of one or more sets of duty cycle parameters.
[0090] In some examples, the UE 115-d may receive, from the UE 115-c, an indication of a first set of duty cycle parameters from the multiple sets of duty cycle parameters. In some examples, the UE 115-d may receive a control signal from the network entity 105-b that indicates a first set of duty cycle parameters from the multiple sets of duty cycle parameters.
[0091] At 410, the network entity 105-b may transmit an LP-WUS to the UE 115-c. In some examples, the LP-WUS may be transmitted to wake up a main radio of the UE 115-c to perform an RR measurement. In some examples, the LP-WUS may be an example of a group-common WUS to wake up main radios at the UE 115-c and the UE 115-d. In some examples, the network entity 105-b may transmit the LP-WUS or an indication of the LP-WUS to wake up the UE 115-d. In some examples, the network entity 105-b may transmit the LP-WUS or an indication of the LP-WUS to a main radio of the UE 115-c, for example using physical-layer control signaling or a MAC CE.
[0092] At 415, the UE 115-c may send a WUS to the UE 115-d based on receiving the LP-WUS from the network entity 105-b. For example, the UE 115-c may send (e.g., forward) the LP-WUS to the UE 115-d. In some examples, the UE 115-c may send a Wi-Fi WUS to the UE 115-d.
[0093] In some examples, the UE 115-d may receive, from the UE 115-c, a physical layer via the first main radio at the UE 115-c. The physical layer signal may include the LP-WUS based on an activation of the second main radio at the UE 115-c. For example, network entity 105-b may transmit the LP-WUS at 410 to wake up the main radio at the UE 115-c for an RRM measurement. The UE 115-c may send the LP-WUS to the UE 115-d to wake up the main radio at the UE 115-d based on the main radio at the UE 115-c being switch to an active state for the RR measurement.
[0094] At 420, the UE 115-c may perform an RRM measurement. During the RRM measurement, the main radio at the UE 115-c may be active, but the UE 115-c may not be able to transmit or receive control or data information using the main radio. Thus, the UE 115-d may be indicated to turn on the main radio of the UE 115-d while the UE 115-c performs the RRM measurement, as the UE 115-c may be unable to send an LP-WUS to the UE 115-d during the RRM measurement.
[0095] At 425, the UE 115-d may monitor, via the first main radio at the UE 115-d, for control signaling from the network entity 105-b according to the duty cycle information based on the LP-WUS. For example, the UE 115-d may monitor for PDCCH signaling from the network entity 105-b according to a set of duty cycle parameters while the UE 115-c is performing the RRM measurement and the main radio of the UE 115-c is active (e.g., but not able to be used to detect LP-WUS for the UE 115-d) . In some examples, the UE 115-d may monitor PDCCH based on a set of duty cycle parameters (e.g., indicated by the network entity 105-b or the UE 115-c) from multiple sets of duty cycle parameters configured at the UE 115-d.
[0096] Figure 5 shows an example of a processing system 520 that supports low power radio techniques with UE cooperation. A processing system 520 may be an example of a processing system 140 (such as of a UE 115) and may include a duty cycle configuration component 525, an LP-WUS reception component 530, a monitoring component 535, a duty cycle switching component 540, or any combination thereof. A processing system 520, or various component thereof, may be an example of means for performing (such as a means for causing a UE 115 to perform) various techniques described herein.
[0097] The duty cycle configuration component 525 may be configured to cause the UE 115 to receive, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE. The LP-WUS reception component 530 may be configured to cause the UE 115 to receive, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal including a low-power wake up signal based on an activation of the second main radio at the second UE. The monitoring component 535 may be configured to cause the UE 115 to monitor, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based on the low-power wake up signal.
[0098] In some examples, to support receiving the duty cycle information, the duty cycle configuration component 525 may be configured to cause the UE 115 to receive the duty cycle information that indicates a set of multiple sets of duty cycle parameters.
[0099] In some examples, to support monitoring for the control signaling from the network entity, the monitoring component 535 may be configured to cause the UE 115 to monitor for the control signaling according to a first set of duty cycle parameters of the set of multiple sets of duty cycle parameters. In some examples, to support monitoring for the control signaling from the network entity, the duty cycle switching component 540 may be configured to cause the UE 115 to receive, during a monitoring occasion that corresponds to an on duration of the first set of duty cycle parameters, a duty cycle switching command that indicates to apply a second set of duty cycle parameters from the set of multiple sets of duty cycle parameters. In some examples, to support monitoring for the control signaling from the network entity, the monitoring component 535 may be configured to cause the UE 115 to monitor for second control signaling according to the second set of duty cycle parameters based on the duty cycle switching command.
[0100] In some examples, the low-power wake up signal identifies a first set of duty cycle parameters from the set of multiple sets of duty cycle parameters. In some examples, the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.
[0101] In some examples, the duty cycle configuration component 525 may be configured to cause the UE 115 to receive, from the second UE, an indication of a first set of duty cycle parameters from the set of multiple sets of duty cycle parameters, and where the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.
[0102] In some examples, the duty cycle configuration component 525 may be configured to cause the UE 115 to receive a control signal from the network entity that identifies a first set of duty cycle parameters from the set of multiple sets of duty cycle parameters, and where the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.
[0103] In some examples, to support receiving the duty cycle information, the duty cycle configuration component 525 may be configured to cause the UE 115 to receive a control signal that indicates the duty cycle information, where the control signal is an RRC signal or a medium access control (MAC) control element (CE) .
[0104] In some examples, to support receiving the duty cycle information, the duty cycle configuration component 525 may be configured to cause the UE 115 to receive the duty cycle information that indicates a periodicity, a starting monitoring occasion, a monitoring occasion length, a duty cycle duration, or any combination thereof, for monitoring for the control signaling from the network entity.
[0105] In some examples, the monitoring component 535 may be configured to cause the UE 115 to power on the first main radio at the first UE during an on duration indicated by the duty cycle information. In some examples, the monitoring component 535 may be configured to cause the UE 115 to power off the first main radio at the first UE based on an expiration of the on duration.
[0106] In some examples, the low-power wake up signal indicates a radio resource management (RRM) procedure for the second UE.
[0107] A processing system 520 may include or be a component of one or more chips, systems-on-chips (SoCs) , chipsets, packages, components, or devices that individually or collectively constitute or include a processing system. A processing system 520 may interface with other components of a processing system 520. For example, operations described with reference to a processing system 520, or various components thereof, may be performed by or with other such components, including a receiver, a transmitter, a transceiver, a modem, a user interface, a modulator / demodulator, an encoder / decoder, or any combination thereof (such as of the processing system 520, coupled with the processing system 520, of a processing system 520) .
[0108] By including or configuring a processing system 520 for operation in a processing system 520 as described herein, the processing system 520 may support techniques for reduced power consumption.
[0109] Figure 6 shows an example of a system 600 including a device 605 that supports low power radio techniques with UE cooperation. The device 605 may be an example of or include components of UE 115. The device 605 may communicate (such as wirelessly) with one or more other devices (such as network entities 105, UEs 115) . The device 605 may include components for transmitting and receiving communication, which may include a processing system 620, an input / output (I / O) controller, such as an I / O controller 610, a transceiver 615, antenna (s) 625, a memory 630, and a processor 640. Components of the device 605 may be coupled (such as operatively, communicatively, functionally, electronically, electrically, in electronic communication) a bus 655.
[0110] The transceiver 615 may support bi-directional communication via antenna (s) 625, and may support transmission operations, reception operations, or both, as described herein. The transceiver 615 may implement functionality of a modem (such as a wireless modem) and may include one or more RF chains. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , and other components that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for digital processing at the device 605) . The transceiver 615 may modulate symbols and provide the modulated symbols to antenna (s) 625 for transmission, and demodulate symbols from signals received using antenna (s) 625.
[0111] The processor 640 may be a general-purpose processing component that supports various operations (such as applications) of the device 605. The memory 630 may be a general-purpose storage component that stores code executable by the processor 640. Such code may include instructions that, when executed by the processor 640, cause the device 605 to perform various functions (such as to support an application of the device 605) . The I / O controller 610 may manage inputs and outputs for the device 605, may manage peripherals not integrated into the device 605, or may represent a physical connection (such as port) to an external peripheral. The processor 640 may interact with a modem, a keyboard, a mouse, a touchscreen, or other device (such as via I / O controller 610) . In some implementations, a user may interact with the device 605 via the I / O controller 610 or via hardware components controlled by the I / O controller 610.
[0112] The processing system 620 may be an example of a processing system 140 or a processing system 500. For example, the processing system 620 may include processor circuitry 645 and memory circuitry 650 that stores code, and may be configured to cause the device 605 to perform operations that support low power radio techniques with UE cooperation. Although the processing system 620 is illustrated as a separate component, which may involve a separate chip, chipset, or other module, in some implementations, one or more functions described with reference to the processing system 620 may be supported by or performed by a transceiver 615, antenna (s) 625, a processor 640, memory 630, or any combination thereof, such that a processing system 620 may include one or more of a transceiver 615, antenna (s) 625, a processor 640, memory 630, or any combination thereof.
[0113] By including or configuring the processing system 620 for operation in the device 605 as described herein, may support techniques for improved communication reliability, reduced latency, and reduced power consumption.
[0114] Figure 7 shows an example of a method 700 that supports low power radio techniques with UE cooperation. Operations of the method 700 may be performed by a UE or its components (such as using a processing system configured to cause the UE 115 to perform one or more of the operations) as described herein.
[0115] At 705, the method may include receiving, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE. In some examples, aspects of the operations of 705 may be performed by a duty cycle configuration component 525.
[0116] At 710, the method may include receiving, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal including a low-power wake up signal based on an activation of the second main radio at the second UE. In some examples, aspects of the operations of 710 may be performed by an LP-WUS reception component 530.
[0117] At 715, the method may include monitoring, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based on the low-power wake up signal. In some examples, aspects of the operations of 715 may be performed by a monitoring component 535.
[0118] Implementation examples are described in the following numbered clauses:
[0119] Aspect 1: A method for wireless communications at a first UE, comprising: receiving, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE; receiving, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal comprising a low-power wake up signal based at least in part on an activation of the second main radio at the second UE; and monitoring, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based at least in part on the low-power wake up signal.
[0120] Aspect 2: The method of aspect 1, wherein receiving the duty cycle information comprises: receiving the duty cycle information that indicates a plurality of sets of duty cycle parameters.
[0121] Aspect 3: The method of aspect 2, wherein monitoring for the control signaling from the network entity comprises: monitoring for the control signaling according to a first set of duty cycle parameters of the plurality of sets of duty cycle parameters; receiving, during a monitoring occasion that corresponds to an on duration of the first set of duty cycle parameters, a duty cycle switching command that indicates to apply a second set of duty cycle parameters from the plurality of sets of duty cycle parameters; and monitoring for second control signaling according to the second set of duty cycle parameters based at least in part on the duty cycle switching command.
[0122] Aspect 4: The method of any of aspects 2 through 3, wherein the low-power wake up signal identifies a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.
[0123] Aspect 5: The method of any of aspects 2 through 4, further comprising: receiving, from the second UE, an indication of a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and wherein the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.
[0124] Aspect 6: The method of any of aspects 2 through 5, further comprising: receiving a control signal from the network entity that identifies a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and wherein the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.
[0125] Aspect 7: The method of any of aspects 1 through 6, wherein receiving the duty cycle information comprises: receiving a control signal that indicates the duty cycle information, wherein the control signal is an RRC signal or a medium access control (MAC) control element (CE) .
[0126] Aspect 8: The method of any of aspects 1 through 7, wherein receiving the duty cycle information comprises: receiving the duty cycle information that indicates a periodicity, a starting monitoring occasion, a monitoring occasion length, a duty cycle duration, or any combination thereof, for monitoring for the control signaling from the network entity.
[0127] Aspect 9: The method of any of aspects 1 through 8, further comprising: powering on the first main radio at the first UE during an on duration indicated by the duty cycle information; and powering off the first main radio at the first UE based at least in part on an expiration of the on duration.
[0128] Aspect 10: The method of any of aspects 1 through 9, wherein the low-power wake up signal indicates a radio resource management (RRM) procedure for the second UE.
[0129] Aspect 11: A first UE for wireless communications, comprising a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the first UE to perform a method of any of aspects 1 through 10.
[0130] Aspect 12: A first UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 10.
[0131] Aspect 13: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 10.
[0132] It should be noted that methods described herein describe possible implementations. Other implementations in accordance with the described techniques are possible, including implementations in which operations are rearranged or otherwise modified relative to the described methods. Further, aspects from two or more of the described methods may be combined.
[0133] Although aspects of 5G or 6G systems may be described for purposes of example and corresponding terminology may be used in the description, the techniques described herein are applicable beyond 5G, or 6G networks. For example, the described techniques may be applicable to other communication systems such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.20, Flash-OFDM, or other systems and radio technologies not explicitly mentioned herein.
[0134] As used herein, a processing system (such as a processing system 140, a processing system 145) includes processor (or “processing” ) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs) , graphics processing units (GPUs) , neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASICs) , programmable logic devices (PLDs) , or other discrete gate or transistor logic or circuitry (any one or more of which may be generally referred to herein individually as a “processor” or collectively as “the processor” or “the processor circuitry” ) . Such processors may be individually or collectively configurable or configured to perform functions or operations described herein. A group of processors collectively configurable or configured to cause a device to perform a set of functions may include a first processor configured to cause the device to perform a first function of the set and a second processor configured to cause the device to perform a second function of the set. In some other examples, each of a group of processors may be configured to cause a device to perform a same set of functions.
[0135] As used herein, a processing system (such as a processing system 140, a processing system 145) also includes memory circuitry in the form of one or multiple memory devices, memory blocks, memory elements, or other discrete gate or transistor logic or circuitry, each of which may include or implement tangible storage media such as random-access memory (RAM) or read-only memory (ROM) , or combinations thereof (any one or more of which may be generally referred to herein individually as a “memory” or collectively as “the memory” or “the memory circuitry” ) . One or more of the memories may be coupled (such as operatively, communicatively, electronically, electrically) with one or more processors of the processor circuitry and may individually or collectively store processor-executable code or instructions (such as software) that, when executed by one or more of the processors, may cause a device (such as configure the device, using one or more of the processors) to perform functions or operations described herein. Additionally, or alternatively, in some examples, one or more of the processors may be configured to cause a device to perform functions or operations described herein without requiring configuration by software. As used herein, “software” shall be construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
[0136] As used herein, a processing system (such as a processing system 140, a processing system 145) may include or be coupled with one or more modems (such as a cellular modem, a 5G-compliant modem, a 6G-compliant modem) . In some examples, one or more processors of a processing system may include or implement one or more of the modems. A processing system also may include or be coupled with multiple radios (collectively “the radio” ) , multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some examples, one or more processors of a processing system may include or implement one or more of the radios, RF chains, or transceivers. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by processor circuitry) .
[0137] As described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code (such as processor-executable code, instructions) stored in memory circuitry (such as a non-transitory computer-readable medium, of the memory circuitry, storing code for wireless communication that is executable by a processing system) or otherwise, to perform one or more of the functions described herein.
[0138] As used herein, the term “determine” or “determining” can encompass one or more of a variety of actions. For example, “determining” can include one or more of calculating, computing, processing, deriving, detecting, estimating, looking up, inferring, ascertaining, measuring, resolving, selecting, obtaining, identifying, interpreting, demodulating, decoding, reading, establishing, forming, or generating, among other examples. In some such examples, determining can involve a processing system performing some type of calculating, computing, deriving, estimating, inferring, ascertaining, resolving, predicting, or other processing to obtain one or more numerical values, sets, elements, or other information or results. In some such examples, determining can involve a processing system identifying, looking up, investigating or otherwise obtaining some type of value, set, element, or other information or result from a table, data structure, database, or an implementation of memory, such as from a larger set of values, sets, or elements or other information or results. In some such examples, determining can involve a processing system identifying, interpreting, demodulating, decoding, detecting, reading, or otherwise obtaining some type of value, set, element, or other information or result signaled in, for example, a received wireless signal. In some such examples, determining can involve a processing system performing a measurement, such as on a received signal.
[0139] As used herein, the phrase “associated with” is intended to be interpreted in the inclusive sense, unless otherwise explicitly indicated. For example, the phrase “associated with” is not to be construed as a reference to a closed set of conditions, factors, criteria, elements, components or actions, among other examples. Specifically, unless a phrase refers to “associated with only ‘a, ’ ” or the equivalent in context, whatever it is that is “associated with ‘a, ’ ” may be associated with “a” alone or associated with a combination of “a” and one or more other conditions, factors, criteria, elements, components or actions, among other examples. The phrase “associated with” may be interpreted to mean or be interchanged with “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” “using, ” “coupled with, ” in communication with, ” “configured with, ” “included with, ” or “in cooperation with, ” as appropriate in the relevant context unless otherwise explicitly indicated. Additionally, the use of such phrases does not indicate that what follows the phrase is the focal point or primary factor associated with the limitation preceding the phrase.
[0140] As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. For example, “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c. Additionally, as used herein, a phrase referring to “a” or “an” element refers to one or more of such elements acting individually or collectively to perform the recited function (s) . Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For instance, for a claim that refers to “a” component performing one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components, and subsequent reference to a component introduced with the article “a” using the term “the” may refer to any or all of the single or multiple components. Thus, a component introduced with the article “a” may be understood to mean “one or more” components, and referring to “the” component subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more” components. Additionally, as used herein, a “set” can refer to one or more items, and a “subset” can refer to a whole set or less than the whole set, but not an empty set. Additionally, as used herein, the term “or” is intended to be interpreted in the inclusive sense, such as when referring to a series, and may be used interchangeably with the term “and / or, ” unless otherwise explicitly indicated (for example, if used in conjunction with “either” or “only one of” ) . For example, “a or b” may include a only, b only, or a combination of a and b.
[0141] The disclosure is provided to enable a person having ordinary skill in the art to implement the described techniques. Modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the techniques disclosed herein may be applied with 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
1.A first user equipment (UE) , comprising:a processing system that includes processor circuitry and memory circuitry that stores code, the processing system configured to cause the first UE to:receive, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE;receive, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal comprising a low-power wake up signal based at least in part on an activation of the second main radio at the second UE; andmonitor, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based at least in part on the low-power wake up signal.2.The first UE of claim 1, wherein, to receive the duty cycle information, the processing system is configured to cause the first UE to:receive the duty cycle information that indicates a plurality of sets of duty cycle parameters.3.The first UE of claim 2, wherein, to monitor for the control signaling from the network entity, the processing system is configured to cause the first UE to:monitor for the control signaling according to a first set of duty cycle parameters of the plurality of sets of duty cycle parameters;receive, during a monitoring occasion that corresponds to an on duration of the first set of duty cycle parameters, a duty cycle switching command that indicates to apply a second set of duty cycle parameters from the plurality of sets of duty cycle parameters; andmonitor for second control signaling according to the second set of duty cycle parameters based at least in part on the duty cycle switching command.4.The first UE of claim 2, wherein:the low-power wake up signal identifies a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, andthe monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.5.The first UE of claim 2, wherein the processing system is further configured to cause the first UE to:receive, from the second UE, an indication of a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and wherein the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.6.The first UE of claim 2, wherein the processing system is further configured to cause the first UE to:receive a control signal from the network entity that identifies a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and wherein the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.7.The first UE of claim 1, wherein, to receive the duty cycle information, the processing system is configured to cause the first UE to:receive a control signal that indicates the duty cycle information, wherein the control signal is a radio resource control (RRC) signal or a medium access control (MAC) control element (CE) .8.The first UE of claim 1, wherein, to receive the duty cycle information, the processing system is configured to cause the first UE to:receive the duty cycle information that indicates a periodicity, a starting monitoring occasion, a monitoring occasion length, a duty cycle duration, or any combination thereof, for monitoring for the control signaling from the network entity.9.The first UE of claim 1, wherein the processing system is further configured to cause the first UE to:power on the first main radio at the first UE during an on duration indicated by the duty cycle information; andpower off the first main radio at the first UE based at least in part on an expiration of the on duration.10.The first UE of claim 1, wherein the low-power wake up signal indicates a radio resource management (RRM) procedure for the second UE.11.A method for wireless communications at a first user equipment (UE) , comprising:receiving, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE;receiving, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal comprising a low-power wake up signal based at least in part on an activation of the second main radio at the second UE; andmonitoring, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based at least in part on the low-power wake up signal.12.The method of claim 11, wherein receiving the duty cycle information comprises:receiving the duty cycle information that indicates a plurality of sets of duty cycle parameters.13.The method of claim 12, wherein monitoring for the control signaling from the network entity comprises:monitoring for the control signaling according to a first set of duty cycle parameters of the plurality of sets of duty cycle parameters;receiving, during a monitoring occasion that corresponds to an on duration of the first set of duty cycle parameters, a duty cycle switching command that indicates to apply a second set of duty cycle parameters from the plurality of sets of duty cycle parameters; andmonitoring for second control signaling according to the second set of duty cycle parameters based at least in part on the duty cycle switching command.14.The method of claim 12, whereinthe low-power wake up signal identifies a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, andthe monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.15.The method of claim 12, further comprising:receiving, from the second UE, an indication of a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and wherein the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.16.The method of claim 12, further comprising:receiving a control signal from the network entity that identifies a first set of duty cycle parameters from the plurality of sets of duty cycle parameters, and wherein the monitoring for the control signaling from the network entity is according to the first set of duty cycle parameters.17.The method of claim 11, wherein receiving the duty cycle information comprises:receiving a control signal that indicates the duty cycle information, wherein the control signal is a radio resource control (RRC) signal or a medium access control (MAC) control element (CE) .18.The method of claim 11, wherein receiving the duty cycle information comprises:receiving the duty cycle information that indicates a periodicity, a starting monitoring occasion, a monitoring occasion length, a duty cycle duration, or any combination thereof, for monitoring for the control signaling from the network entity.19.The method of claim 11, further comprising:powering on the first main radio at the first UE during an on duration indicated by the duty cycle information; andpowering off the first main radio at the first UE based at least in part on an expiration of the on duration.20.A non-transitory computer-readable medium storing code for wireless communications at a first user equipment (UE) , the code comprising instructions executable by one or more processors to:receive, from a network entity, duty cycle information for a first main radio at the first UE, the duty cycle information indicating time periods during which a second main radio at a second UE is active and a low-power radio at the second UE is unable to transmit wake up signaling to the first UE;receive, from the second UE, a physical-layer signal via the first main radio at the first UE, the physical-layer signal comprising a low-power wake up signal based at least in part on an activation of the second main radio at the second UE; andmonitor, via the first main radio at the first UE, for control signaling from the network entity according to the duty cycle information based at least in part on the low-power wake up signal.