Cell reselection for user equipment with multiple radios

Abstract

Various aspects of the present disclosure relate to cell reselection for user equipment (UE) with multiple radios. A UE may have multiple radios, including a first radio with a first power consumption level and a second radio with a second power consumption level different than the first power consumption level. The UE receives first signaling associated with a measurement, such as a signal quality measurement. The measurement is associated with a serving cell. The UE activates at least one of the first radio or the second radio based on the measurement satisfying at least one threshold value. The UE monitors for second signaling associated with a cell reselection procedure via the first radio or the second radio. The cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

Description

CELL RESELECTION FOR USER EQUIPMENT WITH MULTIPLE RADIOSRELATED APPLICATION

[0001] This application claims priority to U.S. Provisional Application Serial No. 63 / 613,621 filed December 21, 2023, entitled “CELL RESELECTION FOR USER EQUIPMENT WITH MULTIPLE RADIOS,” the disclosure of which is incorporated by reference herein in its entirety.TECHNICAL FIELD

[0002] The present disclosure relates to wireless communications, and more specifically to cell reselection procedures.BACKGROUND

[0003] A wireless communications system may include one or multiple network communication devices, such as base stations, which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE), or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communications system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like)). Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G)).SUMMARY

[0004] An article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a,” “at least one,” “one or more,” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of’ or “one or more of’ or “one or both of’) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also,as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.” Further, as used herein, including in the claims, a “set” may include one or more elements.

[0005] Some implementations of the method and apparatuses described herein may include a UE for wireless communication, the UE including a first radio, a second radio, at least one memory, and at least one processor to receive first signaling associated with a measurement, the measurement associated with a serving cell, activate at least one of the first radio or the second radio based on the measurement satisfying at least one threshold value, and monitor for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

[0006] In some implementations of the method and apparatuses described herein, the UE receives third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the UE refrains from activating the first radio during the one or more inactive time periods. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the UE refrains from activating the first radio based on the received third signaling. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the UE activates the first radio based on a duration of the one or more active time periods satisfying a threshold value. Additionally, or alternatively, the third signaling is received by the first radio, and the UE receives a wake-up signal (WUS) prior to the one or more active time periods and the one or more inactive time periods and activates the second radio for the cell reselection procedure, where to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure. Additionally, or alternatively, the WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. Additionally, or alternatively, the WUS includes an indication of the one or more active time periods and the one or more inactive time periods, and the UE refrains from communicating signaling including one or more of an earlypaging indicator (PEI), a paging occasion, or a random-access channel (RACH) message.Additionally, or alternatively, the UE activates the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods. Additionally, or alternatively, the third signaling is received by the first radio, and the UE refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure and performs the cell reselection procedure based on measurements associated with the one or more candidate serving cells. Additionally, or alternatively, the UE receives, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid orthogonal frequency division multiplexing (OFDM) sequence.

[0007] Additionally, or alternatively, the UE receives, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence.Additionally, or alternatively, to activate at least one of the first radio or the second radio, the UE receives, via the first radio, a WUS triggering the cell reselection procedure, activates the second radio for the cell reselection procedure, receives, via the second radio, a synchronization signal block (SSB) based on activating the second radio to perform the cell reselection procedure, and refrains from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message based on the WUS triggering the cell reselection procedure. Additionally, or alternatively, the WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the UE refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure, and performs, using the first radio, the cell reselection procedure. Additionally, or alternatively, the UE receives, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, where the cell reselection procedure is based on the respective frequencies. Additionally, or alternatively, the UE measures one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, where the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells. Additionally, or alternatively, the measurement is associated with the second radio, and to activate at least one of the first radio or the second radio, the UE activates the first radio based on the measurement being above the at least one threshold value and deactivates the secondradio based on the measurement being above the at least one threshold value. Additionally, or alternatively, the measurement is associated with the first radio, and to activate at least one of the first radio or the second radio, the UE activates the second radio based on the measurement being below the at least one threshold value. Additionally, or alternatively, the first radio is associated with a first power consumption level, and the second radio is associated with a second power consumption level different than the first power consumption level.

[0008] Some implementations of the method and apparatuses described herein may further include a processor for wireless communication to receive first signaling associated with a measurement, the measurement associated with a serving cell, activate at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value, and monitor for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

[0009] In some implementations of the method and apparatuses described herein, the processor receives third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the processor refrains from activating the first radio during the one or more inactive time periods. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the processor refrains from activating the first radio based on the received third signaling. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the processor activates the first radio based on a duration of the one or more active time periods satisfying a threshold value. Additionally, or alternatively, the third signaling is received by the first radio, and the processor receives a WUS prior to the one or more active time periods and the one or more inactive time periods and activates the second radio for the cell reselection procedure, where to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure. Additionally, or alternatively, the WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. Additionally, or alternatively, the WUS includes an indication of the one or more active time periods and the one or more inactive time periods, and the processor refrains from communicating signaling including one or more of a PEI, a paging occasion, or a RACH message.

[0010] Additionally, or alternatively, the processor activates the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods. Additionally, or alternatively, the third signaling is received by the first radio, and the processor refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure and performs the cell reselection procedure based on measurements associated with the one or more candidate serving cells. Additionally, or alternatively, the processor receives, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. Additionally, or alternatively, the processor receives, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the processor receives, via the first radio, a WUS triggering the cell reselection procedure, activates the second radio for the cell reselection procedure, receives, via the second radio, an SSB based on activating the second radio to perform the cell reselection procedure, and refrains from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message based on the WUS triggering the cell reselection procedure. Additionally, or alternatively, the WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell.

[0011] Additionally, or alternatively, to activate at least one of the first radio or the second radio, the processor refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure, and performs, using the first radio, the cell reselection procedure. Additionally, or alternatively, the processor receives, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, where the cell reselection procedure is based on the respective frequencies. Additionally, or alternatively, the processor measures one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, where the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells. Additionally, or alternatively, the measurement is associated with the second radio, and to activate at least one of the first radio or the second radio, the processor activates the first radio based on the measurement being above the at least one threshold value and deactivates the second radio based on the measurement being above the at least one threshold value. Additionally, or alternatively, themeasurement is associated with the first radio, and to activate at least one of the first radio or the second radio, the processor activates the second radio based on the measurement being below the at least one threshold value. Additionally, or alternatively, the first radio is associated with a first power consumption level, and the second radio is associated with a second power consumption level different than the first power consumption level.

[0012] Some implementations of the method and apparatuses described herein may further include a method performed by a UE, the method including receiving first signaling associated with a measurement, the measurement associated with a serving cell, activating at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value, and monitoring for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

[0013] In some implementations of the method and apparatuses described herein, the method further includes receiving third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the method further includes refraining from activating the first radio during the one or more inactive time periods. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the method further includes refraining from activating the first radio based on the received third signaling.Additionally, or alternatively, to activate at least one of the first radio or the second radio, the method further includes activating the first radio based on a duration of the one or more active time periods satisfying a threshold value. Additionally, or alternatively, the third signaling is received by the first radio, and the method further includes receiving a WUS prior to the one or more active time periods and the one or more inactive time periods and activating the second radio for the cell reselection procedure, where to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure. Additionally, or alternatively, the WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. Additionally, or alternatively, the WUS includes an indication of the one or more active time periods and the one or more inactive time periods, and the method further includes refraining from communicating signaling including one or more of a PEI, a paging occasion, or a RACH message.

[0014] Additionally, or alternatively, the method further includes activating the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods. Additionally, or alternatively, the third signaling is received by the first radio, and the method further includes refraining from activating the second radio based on a capability of the first radio to perform the cell reselection procedure and performing the cell reselection procedure based on measurements associated with the one or more candidate serving cells. Additionally, or alternatively, the method further includes receiving, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. Additionally, or alternatively, the method further includes receiving, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. Additionally, or alternatively, to activate at least one of the first radio or the second radio, the method further includes receiving, via the first radio, a WUS triggering the cell reselection procedure, activating the second radio for the cell reselection procedure, receiving, via the second radio, an SSB based on activating the second radio to perform the cell reselection procedure, and refraining from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message based on the WUS triggering the cell reselection procedure. Additionally, or alternatively, the WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell.

[0015] Additionally, or alternatively, to activate at least one of the first radio or the second radio, the method further includes refraining from activating the second radio based on a capability of the first radio to perform the cell reselection procedure, and performing, using the first radio, the cell reselection procedure. Additionally, or alternatively, the method further includes receiving, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, where the cell reselection procedure is based on the respective frequencies. Additionally, or alternatively, the method further includes measuring one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, where the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells. Additionally, or alternatively, the measurement is associated with the second radio, and to activate at least one of the first radio or the second radio, the method further includes activating the first radio based on the measurement being above the at least one thresholdvalue and deactivating the second radio based on the measurement being above the at least one threshold value. Additionally, or alternatively, the measurement is associated with the first radio, and to activate at least one of the first radio or the second radio, the method further includes activating the second radio based on the measurement being below the at least one threshold value. Additionally, or alternatively, the first radio is associated with a first power consumption level, and the second radio is associated with a second power consumption level different than the first power consumption level.

[0016] Some implementations of the method and apparatuses described herein may further include a base station for wireless communication to transmit first signaling associated with a measurement, the measurement associated with a serving cell, and transmit second signaling to trigger activation of at least one of a first radio or a second radio of a UE for a cell reselection procedure corresponding to a candidate serving cell from one or more candidate serving cells, the activation based on the measurement satisfying at least one threshold value.

[0017] In some implementations of the method and apparatuses described herein, the base station transmits third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. Additionally, or alternatively, the base station transmits a WUS prior to the one or more active time periods and the one or more inactive time periods. Additionally, or alternatively, the WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. Additionally, or alternatively, the WUS includes an indication of the one or more active time periods and the one or more inactive time periods.Additionally, or alternatively, the WUS includes a threshold duration for activating the second radio prior to an inactive time period of the one or more inactive time periods. Additionally, or alternatively, the base station transmits a low power synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. Additionally, or alternatively, the base station transmits a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. Additionally, or alternatively, the base station transmits, to the first radio, a WUS triggering the cell reselection procedure, where the second radio is activated for the cell reselection procedure, and transmits, to the second radio, one or more SSBs corresponding to the cell reselection procedure. Additionally, or alternatively, the WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidateserving cell. Additionally, or alternatively, the base station transmits, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells.

[0018] Some implementations of the method and apparatuses described herein may further include a method performed by a base station, the method including transmitting first signaling associated with a measurement, the measurement associated with a serving cell, and transmitting second signaling to trigger activation of at least one of a first radio or a second radio of a UE for a cell reselection procedure corresponding to a candidate serving cell from one or more candidate serving cells, the activation based on the measurement satisfying at least one threshold value.

[0019] In some implementations of the method and apparatuses described herein, the method further includes transmitting third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. Additionally, or alternatively, the method further includes transmitting a WUS prior to the one or more active time periods and the one or more inactive time periods. Additionally, or alternatively, the WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. Additionally, or alternatively, the WUS includes an indication of the one or more active time periods and the one or more inactive time periods. Additionally, or alternatively, the WUS includes a threshold duration for activating the second radio prior to an inactive time period of the one or more inactive time periods. Additionally, or alternatively, the method further includes transmitting a low power synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. Additionally, or alternatively, the method further includes transmitting a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. Additionally, or alternatively, the method further includes transmitting, to the first radio, a WUS triggering the cell reselection procedure, where the second radio is activated for the cell reselection procedure, and transmitting, to the second radio, one or more SSBs corresponding to the cell reselection procedure. Additionally, or alternatively, the WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell. Additionally, or alternatively, the method further includes transmitting, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells.BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figures 1 and 2 illustrate examples of wireless communications systems in accordance with aspects of the present disclosure.

[0021] Figure 3 illustrate an example of a transmission diagram in accordance with aspects of the present disclosure.

[0022] Figure 4 illustrate an example of a flowchart, in accordance with aspects of the present disclosure.

[0023] Figure 5 illustrates an example of a process flow, in accordance with aspects of the present disclosure.

[0024] Figure 6 illustrates an example of a UE in accordance with aspects of the present disclosure.

[0025] Figure 7 illustrates an example of a processor in accordance with aspects of the present disclosure.

[0026] Figure 8 illustrates an example of a network equipment (NE) in accordance with aspects of the present disclosure.

[0027] Figure 9 illustrates a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.

[0028] Figure 10 illustrates a flowchart of a method performed by an NE in accordance with aspects of the present disclosure.DETAILED DESCRIPTION

[0029] A UE and an NE, such as a base station, in a wireless communications system can communicate using time-frequency resources. In variations, the UE and / or the NE may implement discontinuous transmission (DTX) and discontinuous reception (DRX) techniques to improve energy efficiency by reducing power consumption of the UE and NE when there is no active communication between the UE and / or the NE. The DTX and DRX techniques include defined and / or configured inactive time periods and active time periods at the UE and / or the NE. During the inactive time periods, the NE and / or the UE may not exchange signaling (e.g., transmit or receivesignaling), and the UE and / or the NE may enter a low power state. Further, during the active time periods, the NE and / or the UE may exchange signaling in a full-power or normal power state.

[0030] In some examples, a UE may operate with different power consumption levels in power consumption modes, such as in an active mode with relatively high power consumption and an idle or inactive mode with a relatively low power consumption. A UE in a low power mode (e.g., the idle and / or inactive mode) may operate using reduced transmission and / or reception capabilities (due to reduced transmit power, energy efficient radio transceivers, low power processors, etc.), may perform energy harvesting techniques to supplement battery power, may utilize sleep modes for different components of the UE, or the like. Examples of UEs that are operable in low power modes include, but are not limited to, internet of things (loT) devices, wearable devices, remote sensor devices, and mobile devices. In some examples, a wireless device, for example, a UE may include multiple radios, such as a radio that operates using a relatively low power consumption level, referred to as a low power radio, and a radio that operates at a relatively high power consumption level, referred to as a main radio.

[0031] A NE may transmit a WUS to a low power radio of a UE, and the low power radio may activate (e.g., wake up) a main radio of the UE upon (e.g., in response to, based on) receiving the WUS. In some examples, the WUS may trigger activation of the main radio for exchanging signaling and / or performing operations related to wireless communication, such as for performing a cell selection or cell reselection procedure. During the cell selection procedure and / or the cell reselection procedure, the UE may perform a cell search and measurements of broadcast system information from candidate cells, which may include cells neighboring a current serving cell for a cell reselection procedure. The UE compares the measurements to a cell selection criteria, including signal strength, signal quality, and other parameters. If a current serving cell no longer meets the criteria (e.g., due to a signal strength being below a threshold value), then the UE may initiate a cell reselection procedure to establish a new connection with a candidate cell that meets the selection criteria. However, if a current serving cell is using DTX and / or DRX techniques, then the UE may not receive a trigger to activate the main radio during inactive periods of the DTX cycles (e.g., while the serving cell is not transmitting or receiving signaling). Thus, the UE may not receive a WUS triggering activation of the main radio until after an inactive period of the DTX cycle and may fail to initiate or refrain from initiating a cell selection or cell reselection procedure until after theinactive period of the DTX cycle, causing communication degradation and delays related to the delayed cell selection or cell reselection. Further, in some cases, the low power radio at the UE may be capable of performing the cell reselection procedure. Some techniques for cell reselection at a UE with a main radio and a low power radio involve the NE triggering activation of the main radio to perform the cell reselection procedure. However, if the low power radio at the UE is capable of performing the cell reselection procedure, activating the main radio may result in unnecessary power consumption at the UE.

[0032] As described herein, the UE may perform one or more measurements, such as serving cell quality measurements, and may determine whether to activate a main radio or a low power radio for monitoring signaling related to a cell selection or a cell selection procedure. For example, if the measurements satisfy (e.g., are greater than) a threshold value, then the UE may activate a low power radio. If the measurements fail to satisfy (e.g., are less than) a threshold value, then the UE may activate a main radio. In some examples, the UE may receive signaling indicating that a serving cell of the UE is using DTX and / or DRX techniques. The UE may not activate the low power radio if the serving cell is configured with DTX cycles (e.g., active periods and inactive periods), if the serving cell is transmitting according to the DTX cycles, during inactive periods of the DTX cycle, and / or if a duration of the active period of the DTX cycle fails to satisfy (e.g., is less than) a threshold value. Similarly, the UE may activate the low power radio if the serving cell is configured with DTX and / or DRX cycles, but is not transmitting according to the cycles, and / or if a duration of the active period of the DTX cycle satisfies (e.g., is greater than) a threshold value. Instead of activating the low power radio, the UE may use the main radio to monitor for signaling related to a cell reselection procedure (e.g., broadcast signaling from neighboring cells). If a signal quality of a current serving cell drops below a threshold value, then the UE may perform a cell reselection procedure by selecting a candidate serving cell. In some examples, the UE may determine a capability of the low power radio and may activate the low power radio or the main radio according to the capability. For example, some low power radios may be capable of performing a cell reselection procedure and / or may be capable of receiving and decoding SSBs (e.g., NR signaling), thus the UE may activate the low power radio and not the main radio.

[0033] Aspects of the present disclosure are described in the context of a wireless communications system.

[0034] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more NEs 102, one or more UEs 104, and a core network (CN) 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE- Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a new radio (NR) network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA), etc.

[0035] The one or more NEs 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NE 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN), a NodeB, an eNodeB (eNB), a nextgeneration NodeB (gNB), or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.

[0036] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (voice, video, packet data, messaging, broadcast, etc.) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN). In some implementations, different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NEs 102.

[0037] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an loT device, an Internet-of-Every thing (loE) device, or machine-type communication (MTC) device, among other examples.

[0038] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.

[0039] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NEs 102 or the CN 106 through one or more backhaul links (e.g., SI, N2, N6, or another network interface). In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other indirectly (e.g., via the CN 106). In some implementations, one or more NE 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC). An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs).

[0040] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC), or a 5G core (5GC), which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management functions (AMF)) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (databearers, signal bearers, etc.) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.

[0041] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an SI, N2, N6, or another network interface). The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session). The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106).

[0042] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communications). In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures). The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.

[0043] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a SCS and a cyclic prefix. A first numerology (e.g., / r=0) may be associated with a first SCS (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., / r=0) associated with the first SCS (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., / r=l) may be associated with a second SCS (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., / r=2) may be associated with a third SCS (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., / r=3) may be associated with a fourth SCS (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., / r=4) may be associated with a fifth SCS (e.g., 240 kHz) and a normal cyclic prefix.

[0044] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames). Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.

[0045] Additionally, or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., / r=0, jU=l , / r=2, / r=3, / r=4) associated with respective SCSs of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols). In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz SCS), a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., / r=0) associated with a first SCS (e.g., 15 kHz) may be used interchangeably between subframes and slots.

[0046] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz - 7.125 GHz), FR2 (24.25 GHz - 52.6 GHz), FR3 (7.125 GHz - 24.25 GHz), FR4 (52.6 GHz - 114.25 GHz), FR4a or FR4-1 (52.6 GHz - 71 GHz), and FR5 (114.25 GHz - 300 GHz). In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g.,control information, data). In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.

[0047] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies). For example, FR1 may be associated with a first numerology (e.g., / r=0), which includes 15 kHz SCS; a second numerology (e.g., / r=l), which includes 30 kHz SCS; and a third numerology (e.g., / r=2), which includes 60 kHz SCS. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies). For example, FR2 may be associated with a third numerology (e.g., / r=2), which includes 60 kHz SCS; and a fourth numerology (e.g., / r=3), which includes 120 kHz SCS.

[0048] In some cases, a cell may refer to a radio access node in communication with a base station or including a base station. A cell may have a coverage area, which is a geographic area in which the cell may provide wireless connectivity to devices within. Different cells may operate on defined frequencies or frequency bands, referred to as subcarriers. In some examples, a UE 104 may establish a wireless connection with a cell, and subsequently that cell may be referred to as a serving cell of the UE 104.

[0049] In some examples, the wireless communications system 100 may include one or more wireless devices (e.g., UEs 104) that may be configured to operate in multiple power consumption modes. For example, a UE 104 may operate with reduced processing, power, and / or memory capabilities when in a low power mode, including an idle and / or inactive mode. In some examples, a wireless device may perform energy harvesting techniques to collect and store energy from a received signal to supplement battery power, may use sleep modes for different components (transmitter, receiver, processing components etc.) of the wireless device, or the like. Examples wireless devices that may operate in different power consumption modes include, but are not limited to, power sensitive and / or small form factor devices, such as industrial sensors, controllers, wearable device extended reality (XR) devices (e.g., smart glasses), and mobile devices.

[0050] The loT devices may include ambient loT devices. There may be multiple different types of ambient loT devices. A first type of ambient loT device, referred to as a passive loT device, may have no energy storage and no independent signal generation, thus may use backscattering transmission techniques to communicate signaling. A second type of ambient loTdevice, referred to as a semi-passive loT device, may have energy storage, but may not perform independent signal generation. Semi-passive loT devices may use backscattering transmission techniques and may use stored energy to amplify the reflected (e.g., backscattered) signals. A third type of ambient loT device, referred to as an active loT device, may have energy storage and independent signal generation. For example, an active loT device may include active radio frequency components (e.g., radio, receiver, transmitter, transceiver) for transmitting and / or receiving signals.

[0051] In some examples, a UE 104 with multiple radios, including a main radio and a low power radio, may operate in multiple power consumption modes, which is described in further detail with respect to Figure 2. In some examples, the main radio of the UE 104 may operate with a different (e.g., greater) power consumption level than the low power radio. Thus, when the UE 104 is in an idle or inactive state, the UE 104 may configure the main radio to operate in a sleep state. While the main radio is in a sleep state, the UE 104 may use the low power radio to monitor for signaling that triggers activation of the main radio (e.g., to receive and / or transmit signaling the low power radio is not capable of transmitting or receiving). For example, an NE 102 may transmit a WUS to a low power radio to indicate for the UE 104 to wake up, or activate, a main radio to transmit or receive signaling. For example, the NE 102 may transmit a WUS to the UE 104 prior to a random-access channel (RACH) procedure or prior to transmitting paging information. In some other examples, the NE 102 may transmit a WUS to the UE 104 prior to a cell reselection or cell selection procedure. The low power radio may receive the WUS and may indicate for the UE 104 to activate the main radio and / or may trigger activation of the main radio in some other manner. Once active, the main radio may transmit and / or receive signaling related to the RACH procedure, the paging information, and / or for a cell reselection or cell selection procedure which is described in further detail with respect to Figures 2 and 3.

[0052] A UE 104 and an NE 102 may implement discontinuous cycles, such as for DTX and DRX, to improve energy efficiency by reducing power consumption of the UE 104 and NE 102 when there is no active communication. The discontinuous cycles include defined and / or configured inactive time periods and active time periods at the UE 104 and / or the NE 102. The inactive time periods may follow active time periods, or vice-versa, and the inactive periods and active periods may occur according to a periodicity. The NE 102 may define a duration of the inactive periods andthe active periods to be a same value or a different value. For DTX and DRX at the NE 102 (e.g., cell DTX and DRX), the NE 102 may not transmit or receive signaling during the inactive time periods, and the NE 102 may enter a low power state. Example low power states for an NE 102 and / or a UE 104 include an idle mode and / or an inactive mode in which the NE 102 and / or UE 104 reduce a power consumption by reducing a numerical quantity of transmissions or receptions, deactivating one or more components of the NE 102 and / or UE 104 (radios, processors, etc.), or the like. Similarly, during the active time periods, the NE may transmit or receive signaling in a fullpower or normal power state. In the normal power state, an NE 102 and / or a UE 104 may be available to transmit and / or receive signaling (e.g., without reducing a numerical quantity of transmission or receptions), may activate some, or all, of the components at the NE 102 and / or the UE 104 (radios, processors, etc.), or the like.

[0053] The UE 104 may be unaware of the DTX and DRX cycles at the NE 102. Thus, as the NE 102 transitions between the active and inactive states, the UE 104 may enter a low power mode. In the low power mode, the UE may deactivate a main radio and may activate a low power radio for monitoring for WUSs and / or synchronization signals that the low power radio is capable of receiving, referred to as low power WUSs or low power synchronization signals. A signal strength and quality from a serving cell may degrade (e.g., due to the UE 104 moving out of a coverage area of the serving cell, due to environmental factors, or due to other factors), and the UE 104 may perform a cell reselection procedure to improve signal strength and quality by switching from a current serving cell to a candidate serving cell. Additionally, or alternatively, the UE 104 may power on, change from an inactive state to an active state, or the like and may initiate a cell selection procedure. In some cases, the low power radio at the UE 104 may be unable to perform the cell selection procedure and / or the cell reselection procedure, such as due to reduced transmission and / or reception capabilities and / or reduced processing capabilities. For example, the low power radio may be unable to receive and perform signal strength and / or quality measurements on signaling from candidate serving cells. Thus, the NE 102 may transmit a WUS to the UE 104 to trigger activation of a main radio for a cell reselection procedure. However, if the NE 102 is in an inactive period of a DTX cycle, the NE 102 may be unable to transmit the WUS, delaying the cell reselection procedure at the UE 104 until an active period. Further, in some cases, the low power radio at the UE 104 may be capable of performing the cell reselection procedure. Conventionaltechniques for cell reselection at a UE 104 with a main radio and a low power radio involve the NE 102 triggering activation of the main radio to perform the cell reselection procedure. However, if the low power radio at the UE 104 is capable of performing the cell reselection procedure, activating the main radio may result in unnecessary power consumption at the UE 104.

[0054] In some examples, the UE 104 may perform one or more measurements, such as measurements defining or related to a serving cell quality and may determine whether to activate a main radio or a low power radio for monitoring for signaling related to a cell selection or a cell selection procedure. For example, if the measurements satisfy (e.g., are greater than) a threshold value, then the UE 104 may activate a low power radio. If the measurements fail to satisfy (e.g., are less than) a threshold value, then the UE 104 may activate a main radio. In some examples, the UE 104 may receive signaling indicating that a serving cell of the UE 104 (e.g., an NE 102) is using DTX and / or DRX techniques. The UE 104 may not activate the low power radio if the serving cell is configured with DTX cycles (e.g., active periods and inactive periods), if the serving cell is transmitting according to the DTX cycles, during inactive periods of the DTX cycle, and / or if a duration of the active period of the DTX cycle fails to satisfy (e.g., is less than) a threshold value. Similarly, the UE 104 may activate the low power radio if the serving cell is configured with DTX and / or DRX cycles, but is not transmitting according to the cycles, and / or if a duration of the active period of the DTX cycle satisfies (e.g., is greater than) a threshold value. Instead of activating the low power radio, the UE 104 may use the main radio to monitor for signaling related to a cell reselection procedure (e.g., broadcast signaling from neighboring cells). If a signal quality of a current serving cell drops below a threshold value, then the UE 104 may perform a cell reselection procedure by selecting a candidate serving cell. In some examples, the UE 104 may determine a capability of the low power radio and may activate the low power radio or the main radio according to the capability. For example, some low power radios may be capable of performing a cell reselection procedure and / or may be capable of receiving and decoding SSBs (e.g., NR signaling), thus the UE 104 may activate the low power radio and not the main radio.

[0055] Figure 2 illustrates an example of a wireless communications system 200, in accordance with aspects of the present disclosure. In some examples, the wireless communications system 200 implements aspects of the wireless communications system 100. For example, the wireless communications system 200 includes a serving cell 202, one or more candidate serving cells 204,and a UE 104, which may be examples of NEs 102 and a UE 104 as described with reference to Figure 1. The serving cell 202 and / or the candidate serving cells 204 may transmit signaling to one or more radios of the UE 104 via downlink wireless communications links 206. For example, the serving cell 202 and / or the candidate serving cells 204 may transmit data, control signaling, or both to the UE 104 via the downlink wireless communications links 206. Although the downlink wireless communications links 206 are illustrated as separate wireless communications links, the serving cell 202 and / or the candidate serving cells 204 may establish a single downlink wireless communications link with the UE 104, respectively.

[0056] In some examples, the serving cell 202 and / or the candidate serving cells 204 and the UE 104 may exchange control signaling to establish and / or maintain a wireless connection. For example, the serving cell 202, the candidate serving cells 204, and / or the UE 104 may exchange one or more reference signals, including, but not limited to, synchronization signals 208. The serving cell 202, the candidate serving cells 204, and / or the UE 104 may perform one or more measurements on the reference signals to evaluate signal metrics, including signal quality, signal power, and / or detection rate of a reference signal. Example measurements include, but are not limited to, a receive signal strength indicator (RSSI) or energy detection including a linear average of total received power over a RSSI resource, reference signal receive power (RSRP) including a linear average of received power of resource of reference signals or signal parts, and a reference signal receive quality (RSRQ).

[0057] In some cases, a UE 104 may operate in one or more different modes, including an idle or inactive mode in which the UE 104 is not actively exchanging data transmissions with a serving cell 202 and a connected or active mode in which the UE 104 is actively exchanging data transmissions with the serving cell 202. If the UE 104 is in an idle or inactive mode, the UE 104 may perform a cell selection procedure to establish a connection with a serving cell 202 to transmit or receive data. In some examples, the UE 104 may trigger a cell selection procedure when the UE 104 is powered on, when the UE 104 is switched into an active transmission or reception mode, or when the UE 104 changes a geographic location. The UE 104 may perform the cell selection procedure by performing cell search and measurements for one or more candidate serving cells 204. The UE 104 may receive reference signals (e.g., synchronization signals 208) from the candidate serving cells 204 and may compare signal characteristics of the signals from the candidate servingcells 204 to select a candidate serving cell 204. For example, the UE 104 may select a candidate serving cell 204 with a highest signal strength and / or quality based on performing signal strength and quality measurements. The candidate serving cells 204 may be one or more cells for which the UE 104 is within a coverage area. The UE 104 may establish a connection with the selected candidate serving cell 204.

[0058] If the UE 104 is in an active mode, or if the UE 104 is in an idle mode but continues to monitor signal quality of reference signals, the UE 104 may perform a cell reselection procedure if the UE 104 determines one or more signal characteristics meet a criteria. For example, the criteria may be related to a signal strength and / or signal quality (e.g., an RSRP, RSRQ, RSSI, or any other signal strength or quality parameter). If one or more measurements for a serving cell fail to satisfy a threshold value for the signal characteristics (e.g., signal strength and / or signal quality parameters), the UE 104 may perform a cell reselection procedure. The UE 104 may perform the cell reselection procedure by performing cell search and measurements for one or more candidate serving cells 204. The UE 104 may receive reference signals (e.g., synchronization signals 208) from the candidate serving cells 204 and may compare signal characteristics of the signals from the candidate serving cells 204 to select a candidate serving cell 204. For example, the UE 104 may select a candidate serving cell 204 with a highest signal strength and / or quality based on performing signal strength and quality measurements. The candidate serving cells 204 may be one or more cells for which the UE 104 is within a coverage area. For example, the candidate serving cells 204 may be cells that neighbor a current serving cell 202 of the UE 104. The UE 104 may establish a connection with the selected candidate serving cell 204.

[0059] In some cases, a UE 104 may include multiple radio components for transmitting and receiving signaling from a network device, such as the serving cell 202 and / or the candidate serving cells 204. The radio components may have different power consumption levels. For example, the UE 104 may include a main radio 210 with a relatively high power consumption level and a low power radio 212 with a relative low power consumption level. The relatively high power consumption level may be a power consumption level that exceeds a threshold value (e.g., a preconfigured value). The relatively low power consumption level may be a power consumption level that is less than a threshold value (e.g., a same threshold value used for the relatively high power consumption or a different threshold value). The main radio 210 may additionally, oralternatively, be referred to as or may implement a main receiver. Similarly, the low power radio 212 may additionally, or alternatively, be referred to as or may implement a low power receiver and / or a low power wake-up radio (LP-WUR). The main radio 210 may monitor for and receive NR signaling, which may use higher power relative to signaling sent to the low power radio 212. For example, the low power radio 212 may receive a WUS to trigger activation of the main radio 210, referred to as a low power WUS (LP-WUS). The low power radio 212 may activate, or wake-up, the main radio 210 upon receiving a WUS (e.g., by triggering or otherwise initiating an active mode at the low power radio 212). The low power radio 212 may operate with reduced power consumption and / or reduced processing relative to the main radio 210. Thus, the low power radio 212 monitoring for a WUS may use relatively fewer power resources and / or processing resource relative to a main radio 210 monitoring for the WUS, providing for reduced power consumption at the UE 104. A UE 104 may include any numerical quantity of radios (e.g., main radios 210 and low power radios 212). The low power radio 212 may operate at a lower power consumption level than a main radio 210 due to reduced monitoring capability (monitoring for less duration than the main radio 210, monitoring a smaller coverage area than the main radio 210, etc.), reduced processing capability, or the like. The main radio 210 may operate at a higher power consumption level than the low power radio 212 due to increasing a monitoring coverage area and / or processing different types of signaling, including signaling that takes additional power consumption to process (e.g., NR signaling).

[0060] In some examples, the UE 104 may activate or deactivate one or more radios based on an operating mode of the UE 104 to improve power consumption. For example, in an idle mode, which may also be referred to as a low power mode, the UE 104 may deactivate a main radio 210 and activate a low power radio 212. In some other examples, in an active or connected mode, the UE 104 may activate a main radio 210 for exchanging signaling (e.g., control signaling or a data transmission) with the serving cell 202 and / or the candidate serving cells 204. In some cases, in the idle mode, the UE 104 may continue to monitor signaling from the serving cell 202 and / or the candidate serving cells 204. For example, the UE 104 may use the low power radio 212 to monitor one or more synchronization signals 208 from the serving cell 202. The serving cell 202 may transmit the synchronization signals 208 with a waveform or other signal parameters the low power radio 212 is capable of receiving, thus the synchronization signals may be referred to as low powersynchronization signals. For example, the low power synchronization signals may have different characteristics (transmission waveform, transmission timing, transmission frequency, etc.) than an SSB. The UE 104 may continue to monitor for a paging message and / or may initiate a RACH procedure from the idle mode, as described in further detail with respect to Figure 3.

[0061] In some examples, there may be different types of low power radios 212. The different types of low power radios 212 may have different functionality and / or capabilities. For example, a low power radio 212 may have a capability to receive one or more NR signals, such as synchronization signals 208 from the serving cell 202 and / or the candidate serving cells 204. In some other examples, a low power radio 212 may not have a capability to receive one or more NR signals and may instead monitor for signaling the serving cell 202 and / or the candidate serving cells 204 configured for the low power radio 212 (e.g., by sending with a selected waveform, timing, frequency, or other transmission parameters the low power radio 212 is capable of receiving). For example, a low power radio 212 may monitor for low power synchronization signals and / or low power WUSs. If the low power radio 212 is capable of receiving synchronization signals 208, or other reference signals, from the serving cell 202 and the candidate serving cells 204, then the UE 104 may perform a cell selection or cell reselection procedure without activating a main radio 210. For example, the low power radio 212 may receive and measure signals from the candidate serving cells 204 to evaluate and select a candidate serving cell 204 for the cell selection procedure or cell reselection procedure.

[0062] In some examples, low power radios 212 may have different components that provide for the different functionality or capability. In some cases, a low power radio 212 may have a separate baseband (BB) processor, radio frequency (RF) chain 214, and / or antenna 216 than the main radio 210. In some other examples, the low power radio 212 may have a separate BB processor but a shared RF chain 214 and a shared antenna 216 with the main radio 210. In yet other examples, the low power radio 212 may have a shared BB processor, RF chain 214, and antenna 216 with the main radio 210. For dynamic spectrum sharing (DSS), a single low power processor may be connected to the main radio 210 and one or more low power radios 212. A low power radio 212 may correspond to a radio access technology (RAT) or a frequency.

[0063] One or more receiver components of the UE 104 (e.g., a receiver used by the main radio 210 and / or the low power radio 212) may have different components and / or functionality. Forexample, the low power radio 212 may include a heterodyne envelope detector implemented at an intermediate frequency (IF) level. Envelop detection is a demodulation process that extracts a shape that represents the varying amplitude of a modulated signal over time. A heterodyne envelope detector combines an incoming modulated signal with a local oscillator signal to obtain an IF. The IF represents a difference of the frequency of the modulated signal and the frequency of the local oscillator signal. The envelope detector extracts the envelope of the IF signal. In some other examples, the low power radio 212 may include a homodyne, or zero IF, envelop detector at the BB processor. In yet other examples, the low power radio 212 may include an OFDM-based sequence or signal with time domain and / or frequency domain correlation.

[0064] In some examples, the serving cell 202 and / or the candidate serving cells 204 may select a waveform to use for generating the transmissions to the low power radio 212. For example, the serving cell 202 and / or the candidate serving cells 204 may select a waveform that provides for a flat spectrum in the frequency domain, resulting in robustness against frequency selective fading compared to concentrated energy transmissions in the frequency domain. To achieve a flat spectrum transmission, the serving cell 202 and / or the candidate serving cells 204 may select an amplitudeshift keying (ASK) modulation scheme, such as an OOK modulation scheme, or sequence. An ASK modulation scheme is a modulation scheme where a transmitting device (e.g., an NE, including the serving cell 202 and / or the candidate serving cells 204) varies an amplitude of a signal between different levels to represent digital data. Different modulation schemes may include different numerical quantities of levels. For example, if there are two levels, then the data may be transmitted as binary values (e.g., “0” for a first amplitude level or “1” for a second amplitude level). For example, OOK-4 may refer to an OOK modulation scheme with four levels. An OOK-4 modulation scheme with a sequence (e.g., Zadoff-Chu, M-sequence, or quadrature amplitude modulation (QAM) sequence) applied before a Discrete Fourier Transform (DFT) and / or least square (ES) with variation in phase may achieve a flatter spectrum. In some examples, the UE 104 knowing a sequence the serving cell 202 and / or the candidate serving cells 204 used to generate a signal (e.g., a EP-WUS) may improve performance for a receiver of the UE 104.

[0065] In some examples, a receiver may implement in-phase and quadrature (I / Q) branches to represent and demodulate a signal. For example, a receiver may separate a received signal into separate in-phase and quadrature components to represent the modulation of a signal. Knowledge ofone or more sequences used in LP-WUS waveform generation may improve performance for at least a receiver with I / Q branches. In some examples, the serving cell 202 and / or the candidate serving cells 204 may select a waveform with a harmonized design that accommodates different waveforms (e.g., OOK with one level (OOK-1), OOK-4, and an OFDM waveform). For example, the waveform may include OFDM sequences overlaid with OOK symbols. According to the harmonized waveform implementation, the OOK signal may include a sequence or randomly modulated symbols (e.g., for quadrature phase-shift keying (QPSK)) transmitted within an ON- duration of the OOK transmission to produce a flattened spectrum to improve against frequency selective fading. The sequence may be a Zadoff-Chu sequence, an M-sequence, a gold sequence, and / or a Golay sequence. In some cases, in the off duration of OOK transmission, no signal transmission occurs. In some examples, a low power synchronization signal may include an OOK-1 and / or OOK-4 waveform signal with or without overlayed OFDM sequences for a low power radio 212 that does not have the capability to receive an SSB.

[0066] The NE 102 may transmit one or more WUSs to the UE 104 to trigger the UE 104 to activate a main radio 210. For example, the UE 104 may receive a WUS (e.g., a LP-WUS) at the low power radio 212. The low power radio 212, or another component of the UE 104 in communication with the low power radio 212 and the main radio 210, may activate the main radio 210 to transmit or receive signaling. In some examples, the NE 102 may trigger activation of the main radio 210 based on one or more entry and / or exit conditions for use of the low power radio 212 and the main radio 210. The NE 102 may transmit an indication of the entry and / or exit conditions to the UE 104, such as in control signaling. The control signaling may be radio resource control (RRC) signaling, a medium access control-control element (MAC-CE), and / or a downlink control information (DCI) message, and may include an SIB. The entry conditions for use of the low power radio 212 include at least a serving cell quality that satisfies a threshold value. For example, the UE 104 may perform one or more serving cell quality measurements at the low power radio 212 and / or one or more serving cell quality measurements at the main radio 210. The UE 104 may compare the serving cell quality measurements to one or more configured thresholds (e.g., indicated in the control signaling). If the serving cell quality measurements exceed a threshold for use of the low power radio 212, then the UE 104 may activate the low power radio 212 and may notactivate the main radio 210 until the low power radio 212 receives a WUS (e.g., to save power at the UE 104).

[0067] The UE 104 may activate the main radio 210 when one or more exit conditions are satisfied. For example, if a serving cell quality measurement at the low power radio 212 is less than the configured threshold, then the UE 104 may activate the main radio 210. When the UE 104 activates the main radio 210, the UE 104 may stop monitoring for WUSs with the low power radio 212. In some examples, once the UE 104 activates the main radio 210, the UE 104 may use the main radio 210 to monitor for paging information and / or to perform a RACH procedure, which is described in further detail with respect to Figure 3.

[0068] In some cases, a serving cell 202 may implement discontinuous cycles, such as for DTX and DRX, to improve energy efficiency by reducing power consumption during inactive periods of the discontinuous cycles when there is no active communication. For example, an NE (e.g., the serving cell 202) may configure a UE 104 with a periodic cell DTX and / or DRX pattern with active and inactive (e.g., non-active) periods of the NE, referred to as cell DTX and / or DRX. The NE may configure and activate the cell DTX and cell DRX patterns separately or together, with a maximum numerical quantity of cell DTX and / or DRX patterns per MAC entity, which is a component responsible for managing access to a communication medium. For example, the maximum numerical quantity of patterns may be two cell DTX and / or DRX patterns per MAC entity for different serving cells 202. During inactive periods of a cell DTX and / or DRX pattern, the UE 104 does not transmit or receive channels and / or signals on a corresponding cell. The cell DTX and / or DRX can be activated and deactivated by RRC signaling or Layer 1 (LI) group common control signaling (e.g., with a defined DCI format).

[0069] The discontinuous cycles include defined and / or configured inactive time periods and active time periods during which the serving cell 202 is not exchanging signaling and exchanging signaling, respectively. The inactive time periods may follow active time periods, or vice-versa, and the inactive periods and active periods may occur according to a periodicity. The serving cell 202 may define a duration of the inactive periods and the active periods to be a same value or a different value. The UE 104 may not factor in the DTX and DRX cycles at the serving cell 202 when determining entry and exit conditions for using a low power radio 212. Thus, as the serving cell 202 transitions between the active and inactive states, the UE 104 may enter a low power mode. In thelow power mode, the UE 104 may deactivate a main radio 210 and may activate a low power radio 212 for monitoring for WUSs and / or synchronization signals 208.

[0070] A signal strength and quality from the serving cell 202 may degrade (e.g., due to the UE 104 moving out of a coverage area of the serving cell, due to environmental factors, or due to other factors), and the UE 104 may perform a cell reselection procedure to improve signal strength and quality by switching from a current serving cell 202 to a candidate serving cell 204. Additionally, or alternatively, the UE 104 may power on, change from an inactive state to an active state, or the like and may initiate a cell selection procedure. In some cases, the low power radio 212 at the UE 104 may be unable to perform the cell selection procedure and / or the cell reselection procedure, such as due to reduced transmission and / or reception capabilities and / or reduced processing capabilities. For example, the low power radio 212 may be unable to receive reference signals and perform signal strength and / or quality measurements on the signaling from candidate serving cells 204. Thus, the serving cell 202 may transmit a WUS to the UE 104 to trigger activation of a main radio 210 for a cell reselection procedure. However, if the serving cell 202 is in an inactive period of a DTX cycle, the serving cell 202 may be unable to transmit the WUS, delaying the cell reselection procedure at the UE 104 until an active period of the DTX cycle. Further, in some cases, the low power radio 212 at the UE 104 may be capable of performing the cell reselection procedure.Conventional techniques for cell reselection at a UE 104 with a main radio 210 and a low power radio 212 involve the serving cell 202 triggering activation of the main radio 210 to perform the cell reselection procedure. However, if the low power radio 212 at the UE 104 is capable of performing the cell reselection procedure, activating the main radio 210 may result in unnecessary power consumption at the UE 104. The serving cell 202 and / or the UE 104 may not factor the DTX cycles of the serving cell 202 into an entry or exit condition for using the low power radio 212, a capability of the low power radio 212 into the entry or exit condition for using the low power radio 212, or both.

[0071] In some examples, an NE may configure the UE 104 with one or more entry and exit conditions for activation and deactivation of the radios of the UE 104. The NE may define the entry and exit conditions for a UE 104 in an idle mode that has established a connection with a serving cell 202 configured and activated with cell DTX and / or DRX patterns. For example, the entry conditions for using the low power radio 212 may define one or more criteria that, when met,provide for the UE 104 to deactivate a main radio 210 and activate a low power radio 212 for power savings at the UE 104. The entry conditions may include at least one threshold value for a measurement of a reference signal, such as one or more thresholds defining a signal quality from a serving cell 202. If the reference signal measurements satisfy the one or more thresholds (e.g., signal strength or quality exceeds a threshold value), then the UE 104 may activate a low power radio 212 and deactivate a main radio 210. In some examples, a main radio 210 of the UE 104 may perform the measurements for determining whether an entry condition is satisfied for activating the low power radio 212 and deactivating the main radio 210.

[0072] The entry conditions may also include criteria related to the DTX and / or DRX patterns of the serving cell 202. For example, an NE may configure one or more criteria during which the UE 104 may not use a low power radio 212, including, but not limited to, for time periods when the serving cell 202 is in an inactive period of a DTX and / or DRX cycle and when the serving cell 202 is configured and / or activated with a cell DTX and / or DRX cycle. A serving cell 202 may not transmit a low power synchronization signal and / or LP-WUS during the inactive periods of the DTX and / or DRX cycles. Additionally, or alternatively, the NE may configure one or more criteria during which the UE 104 may use a low power radio 212, including, but not limited to, when a cell DTX and / or DRX cycle is configured but not activated and when an active period of a DTX and / or DRX cycle is greater than a threshold value (e.g., in time slots or milliseconds (ms)). The threshold value may be a duration for which the UE 104 saves power by entering a low power mode and deactivating a main radio 210 (e.g., activating the low power radio 212 instead of the main radio 210).

[0073] Similarly, the exit conditions for using the low power radio 212 may define one or more criteria that, when met, provide for the UE 104 to activate a main radio 210 and deactivate a low power radio 212. The exit conditions may include at least one threshold value for a measurement of a reference signal, such as one or more thresholds defining a signal quality from a serving cell 202. If the reference signal measurements fail to satisfy the one or more thresholds (e.g., signal strength or quality is less than a threshold value), then the UE 104 activates a main radio 210 and may deactivate a low power radio 212. In some examples, a low power radio 212 of the UE 104 may perform the measurements for determining whether an exit condition is satisfied for deactivating the low power radio 212 and activating the main radio 210.

[0074] The exit conditions may also include criteria related to the DTX and / or DRX patterns of the serving cell 202. For example, if the UE 104 is using a low power radio 212 at a period in time when the cell DTX and / or DRX is configured and / or activated for the serving cell 202, the serving cell 202 may transmit a DTX and / or DRX activation command to a low power radio 212 of the UE 104 using signaling with parameters (waveform, transmission power, time-frequency resources, etc.) that the low power radio 212 is capable of receiving and decoding. The low power radio 212 may receive the DTX and / or DRX activation command, and the UE 104 may activate the main radio 210 before the serving cell 202 enters a cell DTX cycle. In some examples, the serving cell 202 may transmit the DTX and / or DRX activation command in a WUS, or any other signaling the low power radio 212 is capable of decoding.

[0075] In some examples, upon activation, the main radio 210 may initiate a cell reselection procedure. For example, the UE 104 may select a candidate serving cell 204 that is not entering a DTX cycle. A period of time, or duration, that the main radio 210 takes to activate may be referred to as an activation duration. The activation duration for the main radio 210 may depend on a sleep state of the main radio 210. For example, an activation duration in an ultra-deep sleep state may be different than an activation duration in a deep sleep state. The serving cell 202 may transmit the DTX and / or DRX activation command to provide the UE 104 with sufficient time to initiate the cell reselection procedure. For example, the serving cell 202 may factor in a processing time of a low power radio 212 to process signaling including the DTX and / or DRX activation command, the activation duration of the main radio 210, and / or a period of time for the main radio 210 to select a candidate serving cell 204 (e.g., process cell reselection parameters from SIBs), to determine when to send the signaling triggering activation of the main radio 210. In some examples, the low power radio 212 receive a cell DTX and / or DRX activation command, the UE 104 may activate a main radio 210 a threshold duration (e.g., X ms) prior to the serving cell 202 entering an inactive period of a DTX cycle. The threshold duration may factor in an activation duration of the main radio 210 and a duration for performing a cell reselection procedure.

[0076] In some cases, the signaling triggering activation of the main radio 210 (e.g., LP-WUS) may include one or more cell reselection parameters. For example, the signaling may include an intra-RAT intra frequency list, an intra-RAT inter frequency list, and / or an inter RAT inter frequency list to reduce latency for cell reselection by the main radio 210. Additionally, oralternatively, the signaling triggering activation of the main radio 210 may include an indication that the reason for activation is due to cell DTX and / or DRX. Thus, the UE 104 may refrain from monitoring for a PEI and / or paging occasion upon activation and may not perform a RACH procedure. Instead, the main radio 210 may perform a cell reselection procedure. For example, the main radio 210 may receive an SSB from the serving cell 202 for synchronizing with the serving cell 202 and may monitor a SIB including parameters for cell reselection. In some examples, the cell reselection may include performing one or more measurements on reference signals, such as the synchronization signals 208, from candidate serving cells 204.

[0077] In some examples, the UE 104 may receive a list of neighboring serving cells 202 (e.g., a list of candidate serving cells 204) that support signaling to a low power radio 212. If the low power radio 212 is capable of performing cell measurements (e.g., via LP-SSs), the low power radio 212 may perform the cell reselection procedure without activating the main radio 210.

[0078] In some examples, the entry and exit conditions for a UE 104 to use a low power radio 212 may account for transmissions without an SSB (SSB-less transmissions) and / or on-demand SSB transmissions. For example, if a low power radio 212 at a UE 104 supports OOK-1 and / or OOK-4 waveforms without an OFDM overlaid sequence, the UE 104 may check whether the serving cell 202 transmits a low power synchronization signal. If a low power radio 212 at the UE 104 supports OOK-1 and / or OOK-4 waveforms with an OFDM overlaid sequence, then the UE 104 may activate a low power radio 212 and deactivate a main radio 210 even when the serving cell 202 has not transmitted a low power synchronization signal. That is, if the low power radio 212 supports OOK-1 and / or OOK-4 waveforms with an OFDM overlaid sequence, the low power radio 212 may be capable of decoding a synchronization signal 208 (e.g., a PSS and / or SSS) transmitted by a serving cell 202 or candidate serving cell 204. If an NE does not transmit an SSB or transmits an SSB on-demand, then the UE 104 may not use the low power radio 212, as the UE 104 may use synchronization signals 208 (e.g., a PSS and / or SSS) from an SSB for synchronization.

[0079] In some cases, an exit condition for using a low power radio 212 (e.g., for deactivating the low power radio 212) may include a serving cell 202 configuring or activating an SSB-less transmission or on-demand SSB when the low power radio 212 is active. The serving cell 202 may transmit signaling triggering activation of the main radio 210 (e.g., a WUS). In some examples, the signaling may include a wakeup indicator, an indication for the UE 104 to perform cell reselection,and / or a cell identifier or cell frequency (e.g., when the main radio 210 receives periodic SSBs as part of a cell reselection). Additionally, or alternatively, the signaling may include an indication that the serving cell 202 is triggering activation of the main radio 210 due to an SSB-less or on-demand SSB transmission. Thus, the UE 104 may refrain from monitoring for a PEI and / or paging occasion upon activation and may not perform a RACH procedure. Instead, the main radio 210 may perform a cell reselection procedure.

[0080] In some examples, a low power radio 212 may be capable of performing a cell selection and / or cell reselection procedure (e.g., instead of activating a main radio 210 to perform the cell selection and / or cell reselection procedure). For example, the low power radio 212 may include one or more components and / or functionality for monitoring for and measuring reference signals from candidate serving cells 204. The low power radio 212 may receive a cell reselection indication 218, which may include a cell DTX and / or DRX cycle configuration and / or activation, an indication of an SSB-less or on-demand SSB transmission, or both. The low power radio 212 may initiate the cell selection and / or cell reselection after receiving the cell reselection indication 218. In some examples, the serving cell 202 may transmit the list of the intra-RAT intra frequency, the intra-RAT inter frequency, or the inter RAT inter frequency to the low power radio 212 for the cell reselection procedure (e.g., in system information broadcast signaling using low power techniques and / or parameters).

[0081] If the low power radio 212 supports an OOK-1 and / or OOK-4 waveform without an OFDM overlaid sequence, then the low power radio 212 may perform measurement and evaluation of candidate serving cells 204 using low power synchronization signals (e.g., where the synchronization signals 208 are low power synchronization signals). In some cases, the UE 104 may select a candidate serving cell 204 with a strongest signal quality by measuring low power synchronization signal quality and comparing the measurements to a configured threshold (e.g., provided in cell reselection criteria). If the low power radio 212 supports an OOK-1 and / or OOK-4 waveform with an OFDM overlaid sequence, then the low power radio 212 may perform measurement and evaluation of candidate serving cells using synchronization signals 208 from the candidate serving cells 204, such as PSSs and / or SSSs. In some cases, the UE 104 may select a candidate serving cell 204 with a strongest signal quality by measuring one or more SSSs and PSSsfrom the candidate serving cells 204 and comparing the measurements to a configured threshold (e.g., provided in cell reselection criteria).

[0082] In some examples, the UE 104 may select a candidate serving cell 204 from a set of strongest candidate serving cells 204 in different frequency bands based on prioritizing a candidate serving cell 204 from a frequency that maximizes a coverage for the low power radio 212. The frequency may be relatively low and may be configured and / or defined and stored at the low power radio 212. Additionally, or alternatively, the UE 104 may select a candidate serving cell 204 based on an indication in system information signaling.

[0083] Thus, the UE 104 may receive a cell reselection indication 218 from a serving cell 202, which may trigger a cell reselection procedure by the low power radio 212 if the low power radio 212 is capable of performing the cell reselection procedure or a cell reselection procedure by the main radio 210. If the cell reselection procedure is performed by the main radio 210, then the cell reselection indication 218 may trigger activation of the main radio 210. At 220, the UE 104 may activate the main radio and / or may leave the low power radio 212 active for the cell reselection procedure depending on which radio is performing the cell reselection procedure. That is, if the low power radio 212 is capable of performing the cell reselection procedure, then the UE 104 may refrain from activating the main radio 210 (e.g., may not activate the main radio 210), and may instead leave the low power radio 212 active for the cell reselection procedure. If the low power radio 212 is not capable of performing the cell reselection procedure, then the UE 104 may activate the main radio 210 for the cell reselection procedure and may deactivate the low power radio 212. The cell reselection indication 218 may be included in a WUS may be a low power synchronization signal that fails to satisfy a criteria (e.g., signal strength or quality threshold value), or any other control signaling to the low power radio 212.

[0084] Figure 3 illustrates an example of a transmission diagram 300 in accordance with aspects of the present disclosure. In some examples, the transmission diagram 300 may implement, or be implemented by, aspects of the wireless communications system 100 and the wireless communications system 200. The example transmission diagram 300 may be implemented by a UE and an NE (e.g., a serving cell), which may be examples of the corresponding devices as described with reference to Figures 1 and 2. For example, a UE with multiple radios may receive signaling from an NE triggering a cell reselection procedure by a radio with relatively low powerconsumption levels (e.g., low power radio) or a radio with relatively high power consumption levels (e.g., main radio).

[0085] In some examples, a UE may have multiple radios, including a main radio and a low power radio. The UE may monitor for and receive a WUS 302 using the low power radio from an NE, or serving cell, during one or more monitoring occasion. The monitoring occasions may belong to a set, or block, of monitoring occasions. Blocks of monitoring occasions include a numerical quantity of repetitions of the WUS 302. For example, the transmission diagram 300 illustrates two repetitions of a WUS 302 in two monitoring occasions. Once the UE receives the WUS 302 (e.g., the repetitions of the WUS during an assigned or determined block of monitoring occasions), the UE may activate or wake up a main radio.

[0086] In some examples, the main radio may take a period of time to activate, referred to as an activation duration 304. The activation duration 304 may be based on a sleep state of the main radio. For example, if the main radio is in an ultra-deep sleep state, the activation duration 304 may be relatively long (400 milliseconds (ms), 800 ms, etc.). If the main radio is in a deep sleep state the activation duration 304 may be less than when in the ultra-deep sleep state (e.g., 20 ms). The UE and / or the NE may account for the activation duration 304 prior to transmitting or receiving signaling. For example, the main radio may provide the activation duration 304 to the low power radio, so that the low power radio may account for the activation duration 304 and a processing duration for processing signaling at the low power radio. The low power radio may calculate the activation duration 304 in terms of slots, symbols, monitoring occasions, or any other time unit, according to the subcarrier spacing configured at the low power radio. If the NE schedules the UE to transmit or receive signaling within the activation duration 304 using the main radio, the UE may skip transmitting or monitoring the signaling. In some examples, the UE may signal the activation duration 304 to the NE using assistance information and / or capability signaling. In some cases, the UE may transmit uplink control information to an NE indicating a sleep state of the main radio (e.g., using the main radio), prior to the main radio entering the sleep state.

[0087] The NE may transmit the WUS 302 to trigger the UE to activate the main radio for exchanging communications. In some examples, the communications include signaling that a low power radio of the UE is not capable of exchanging (e.g., NR signaling). For example, the NE may transmit the WUS 302 to trigger the UE to perform a RACH procedure. In some examples, the UEmay perform the RACH procedure during an initial connection setup process to establish a connection with the NE. The RACH procedure may include one or more messages between the UE and the NE. For example, the UE may receive an SSB 306 for synchronization and resource allocation. The UE may transmit a RACH preamble (PRACH) 308 to the NE using the main radio. The PRACH may initiate the PRACH procedure. The NE may send a random-access response (RAR) to the main radio in response to the PRACH. In addition, or as an alternative to, the RACH procedure, the WUS 302 may trigger the UE to activate the main radio for monitoring for paging information. For example, the main radio of the UE may monitor one or more paging occasions for a paging message 312. In some examples, the UE may receive a PEI 314 prior to the paging message 312. A PEI 314 notifies a UE in advance of a paging occasion whether the UE is to monitor the paging occasion. The PEI 314 may include subgrouping information to divide the UEs sharing a paging occasion into subgroups. In some examples, the paging message 312 indicates for the UE to establish a connection with the NE to transmit or receive data.

[0088] In some examples, if the WUS 302 triggers a cell reselection, the UE 104 may refrain from monitoring for the PEI 314, the paging message 312, and the RAR 310 and may also refrain from transmitting the PRACH 308. Instead, the UE 104 may receive the SSB 306 and use the synchronization information from the SSB 306 to perform a cell reselection procedure, as described with reference to Figure 2.

[0089] Figure 4 illustrates an example of a flowchart 400, in accordance with aspects of the present disclosure. In some examples, the flowchart 400 may implement aspects of the wireless communications system 100, the wireless communications system 200, and the transmission diagram 300. The flowchart 400 may be implemented by a UE and / or an NE (e.g., a serving cell), which may be examples of the corresponding devices as described with reference to Figures 1 and 2. For example, a UE with multiple radios may receive signaling from an NE triggering a cell reselection procedure by a radio with relatively low power consumption levels (e.g., low power radio) or a radio with relatively high power consumption levels (e.g., main radio).

[0090] At 402 a main radio of a UE may perform a cell selection procedure. The cell selection procedure may provide for the UE to establish a connection with a serving cell.

[0091] At 404, the UE may determine whether low power radio entry conditions are met. The low power entry conditions may be examples of the entry conditions as described with reference to Figure 2. For example, the entry conditions may include one or more of a signal strength and / or quality measurement of signaling from a serving cell satisfying a threshold value, a DTX and / or DRX cycle configuration or activation status of a serving cell, an SSB-less transmission and / or on- demand SSB transmission configuration or activation status, one or more capabilities of the low power radio to perform a cell reselection procedure, or the like. At 406, the UE may continue using the main radio. For example, if the low power entry conditions are not met, then the UE may continue using the main radio (e.g., may not activate a low power radio). At 408, the main radio may enter a sleep state and the low power radio monitors for a WUS and signaling for performing or including serving cell measurements. If the low power entry conditions are met, then the UE may activate the low power radio for monitoring for the WUS and / or to perform the serving cell measurements. The UE may deactivate a main radio by configuring the main radio to enter a sleep state.

[0092] At 410, the UE may determine whether low power radio exit conditions are met. The exit conditions may be examples of the entry conditions as described with reference to Figure 2. For example, the exit conditions include one or more of a signal strength and / or quality measurement of signaling from a serving cell failing to satisfy a threshold value, a DTX and / or DRX cycle configuration or activation status of a serving cell, an SSB-less transmission and / or on-demand SSB transmission configuration or activation status, one or more capabilities of the low power radio to perform a cell reselection procedure, or the like. At 412, the UE activates a main radio. For example, if the exit conditions are met, then the UE may activate the main radio. At 414, the UE may continue using the low power radio. For example, if the exit conditions are not met, the UE may continue to use the low power radio.

[0093] In some examples, at 416, the UE may monitor for a WUS using the low power radio. The UE may monitor for the WUS until the low power radio exit conditions are met and / or until a WUS is received. For example, at 418, the UE activates a main radio. For example, if the UE receives a WUS, then the UE may activate the main radio. In some other examples, if the WUS indicates that the UE is to perform a cell reselection procedure, then the UE may determine whether the low power radio is capable of performing the cell reselection procedure without activating themain radio. If the low power radio is capable of performing the cell reselection procedure, then the low power radio may refrain from activating (e.g., may not activate) the main radio, and may perform the cell reselection procedure. If the low power radio is not capable of performing the cell reselection procedure, then the low power radio may activate the main radio to perform the cell reselection procedure.

[0094] Figure 5 illustrates an example of a process flow 500, in accordance with aspects of the present disclosure. In some examples, the process flow 500 may implement aspects of the wireless communications system 100, the wireless communications system 200, the transmission diagram 300, and the flowchart 400. The process flow 500 may illustrate an example of a UE 104 with multiple radios, including a main radio 210 and a low power radio 212. The main radio 210 has a power consumption level that is higher than and a low power radio 212. A serving cell 202 may transmit signaling to the UE 104 that triggering a cell reselection procedure. The UE 104, the main radio 210, the low power radio 212, the serving cell 202, and the candidate serving cells 204, may be examples of corresponding devices as described with reference to Figures 1 and 2. Alternative examples of the following may be implemented, where some processes are performed in a different order than described or are not performed. In some cases, processes may include additional features not mentioned below, or further processes may be added.

[0095] In some cases, at 502, a low power radio 212 of a UE 104 may receive a cell reselection indication. The cell reselection indication may indicate to the UE 104 to perform a cell reselection procedure to switch from a serving cell 202 to a candidate serving cell 204. In some cases, the serving cell 202 may transmit the cell reselection indication explicitly indicating for the UE 104 to perform a cell reselection procedure. For example, the cell reselection indication may include signaling indicating a cell DTX and / or DRX cycle configuration or activation at the serving cell 202, indicating an SSB-less and / or on-demand SSB transmission configuration or activation at the serving cell 202, or the like. In some other cases, the cell reselection indication may include signaling, such as a reference signal, with an associated measurement. For example, the UE 104 may measure the reference signal to determine a signal strength and / or signal quality of downlink signaling from the serving cell 202. The measurement may include one or more of a RSRP, RSRQ, RSSI, or any other signal measurement. If a measurement fails to satisfy a threshold (e.g., below a signal strength and / or signal quality threshold), then the UE 104 may determine to perform a cellreselection procedure. In some examples, serving cell 202 includes the cell reselection indication in control signaling, such as a WUS, a synchronization signal, system information signaling, or any other signaling to the low power radio 212.

[0096] At 504, the UE 104 may determine whether to activate the main radio 210 or the low power radio 212 for a cell reselection procedure based on a measurement failing to satisfy a threshold value, based on a serving cell 202 being configured with or activating a cell DTX and / or DRX cycle, and / or based on a serving cell 202 configuring or activating an SSB-less or on-demand SSB transmission. In some examples, the UE 104 may determine whether the low power radio 212 is capable of performing the cell reselection procedure. If the low power radio 212 is capable of performing the cell reselection procedure, then the UE 104 may activate the low power radio 212, or leave the low power radio 212 active, and may deactivate the main radio 210, or refrain from activating (e.g., may not activate) the main radio 210. If the low power radio 212 is not capable of performing the cell reselection procedure, then the UE 104 may activate the main radio 210 and may deactivate the low power radio 212.

[0097] The UE 104 may receive or perform one or more measurements (e.g., signal strength and / or signal quality measurements) to determine whether entry conditions and / or exit conditions are met for activating the main radio 210 and / or activating the low power radio 212. In some examples, the main radio 210 may perform the measurements, and the UE 104 may activate the low power radio 212 and deactivate the main radio 210 if the measurements are above a threshold value (e.g., if the low power radio 212 entry conditions are satisfied). In some other examples, the low power radio 212 may perform the measurements, and the UE 104 may deactivate the low power radio 212 and activate the main radio 210 if the measurements are below a threshold value (e.g., if the low power radio 212 exit conditions are satisfied). The measurements may be associated with a serving cell 202 in that they may represent a signal strength and / or signal quality of downlink signaling from the serving cell 202 received by the UE 104 (e.g., by the main radio 210 and / or by the low power radio 212).

[0098] At 506, the UE 104 may receive signaling from a serving cell 202 and / or from candidate serving cells 204 related to the cell reselection procedure. For example, the signaling may include one or more synchronization signals. Depending on which radios are activated at the UE 104 at 504, the UE 104 may use the low power radio 212 and / or the main radio 210 to monitor for and receivethe signaling. If the low power radio 212 is activated, then the UE 104 may monitor for and decode the signaling using the low power radio 212. If the main radio 210 is activated, then the UE 104 may monitor for and decode the signaling using the main radio 210.

[0099] At 508, the UE 104 may select a candidate serving cell 204 from a list or set of candidate serving cells 204. The candidate serving cells 204 may include serving cells that neighbor a current serving cell 202 of the UE 104. In some examples, the serving cell 202 may include one or more parameters related to the cell reselection procedure and / or the candidate serving cells 204 in control signaling, such as in the cell reselection indication at 502 and / or in separate signaling from the cell reselection indication.

[0100] In some examples, the parameters related to the cell reselection procedure and / or the candidate serving cells 204 in control signaling may include frequencies corresponding to the candidate serving cells 204. Additionally, or alternatively, the parameters include one or more active time periods for the serving cell 202 and one or more inactive (e.g., non-active) time periods of the serving cell 202. In some cases, the UE 104 refrains from activating the low power radio 212 during the one or more inactive time periods. In some other cases, the UE 104 refrains from activating the low power radio 212 if the active time periods and inactive time periods (e.g., DTX and / or DRX cycles) are configured and / or activated at the serving cell 202. In some examples, the UE 104 activates the low power radio 212 if a duration of the one or more active time periods satisfies (e.g., is greater than) a threshold value.

[0101] In some cases, the UE 104 receives a WUS prior to the one or more active time periods and the one or more inactive time periods and activates the main radio 210 for the cell reselection procedure if the low power radio 212 is not capable of performing the cell reselection procedure. The WUS may include cell reselection parameters for the cell reselection procedure (e.g., frequency values, a list of candidate serving cells 204, or any other parameters related to cell reselection). In some examples, if the UE 104 receives an indication of the DTX and / or DRX cycle (e.g., a configuration of active time periods and inactive time periods for the serving cell 202), then the UE 104 may refrain from monitoring for a PEI, a paging occasion, RACH messages, and / or refrain from transmitting a RACH message. In some examples, the UE 104 may activate the main radio 210 a threshold duration prior to an inactive time period of the one or more inactive time periods.

[0102] In some examples, if the low power radio 212 is capable of performing the cell reselection procedure, the UE 104 may refrain from activating the main radio 210 and may perform the cell reselection procedure based on measurements associated with the one or more candidate serving cells 204. In some cases, if the low power radio 212 supports a waveform (e.g., an OOK-1 and / or OOK-4 waveform) without an overlaid OFDM sequence, then the low power radio 212 may perform measurement and evaluation of candidate serving cells 204 using low power synchronization signals (e.g., where the synchronization signals at 506 are low power synchronization signals). In some cases, the UE 104 may select a candidate serving cell 204 with a strongest signal quality by measuring low power synchronization signal quality and comparing the measurements to a configured threshold. If the low power radio 212 supports a waveform (e.g., an OOK-1 and / or OOK-4 waveform) with an overlaid OFDM sequence, then the low power radio 212 may perform measurement and evaluation of candidate serving cells using synchronization signals 208 from the candidate serving cells 204, such as SSBs (e.g., including PSSs and / or SSSs).

[0103] In some cases, the UE 104 receives a WUS, at 502, that indicates the purpose of the WUS is to trigger a cell reselection procedure and triggering the cell reselection procedure and wakes up the main radio 210 to perform the cell reselection procedure, at 504. The UE receives SSBs, at 506, and refrains from monitoring for and / or transmitting paging messages (e.g., a PEI and a paging occasion) and RACH procedure messages. The WUS may include a cell identifier of candidate serving cells 204, a frequency of a candidate serving cells 204, or both.

[0104] In some examples, the UE 104 may select a candidate serving cells, at 508, by measuring synchronization signals from candidate serving cells 204 to determine respective signal quality values of the one or more candidate serving cell 204. The UE 104 may select a candidate serving cell 204 with a highest signal quality value.

[0105] Figure 6 illustrates an example of a UE 600 in accordance with aspects of the present disclosure. The UE 600 may include a processor 602, a memory 604, a controller 606, and a transceiver 608. The processor 602, the memory 604, the controller 606, or the transceiver 608, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0106] The processor 602, the memory 604, the controller 606, or the transceiver 608, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0107] The processor 602 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 602 may be configured to operate the memory 604. In some other implementations, the memory 604 may be integrated into the processor 602. The processor 602 may be configured to execute computer-readable instructions stored in the memory 604 to cause the UE 600 to perform various functions of the present disclosure.

[0108] The memory 604 may include volatile or non-volatile memory. The memory 604 may store computer-readable, computer-executable code including instructions when executed by the processor 602 cause the UE 600 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 604 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0109] In some implementations, the processor 602 and the memory 604 coupled with the processor 602 may be configured to cause the UE 600 to perform one or more of the functions described herein (e.g., executing, by the processor 602, instructions stored in the memory 604). For example, the processor 602 may support wireless communication at the UE 600 in accordance with examples as disclosed herein. In some cases, the UE 600 may be configured to or operable to support means for receiving first signaling associated with a measurement, the measurement associated with a serving cell, activating at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value, and monitoring for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselectionprocedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

[0110] Additionally, or alternatively, the UE 600 may be configured to or operable to support any one or combination of means for receiving third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. To activate at least one of the first radio or the second radio, refraining from activating the first radio during the one or more inactive time periods. To activate at least one of the first radio or the second radio, refraining from activating the first radio based on the received third signaling. To activate at least one of the first radio or the second radio, activating the first radio based on a duration of the one or more active time periods satisfying a threshold value. The third signaling is received by the first radio and receiving a WUS prior to the one or more active time periods and the one or more inactive time periods and activating the second radio for the cell reselection procedure, where to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure. The WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. The WUS includes an indication of the one or more active time periods and the one or more inactive time periods and refraining from communicating signaling including one or more of a PEI, a paging occasion, or a RACH message. Activating the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods. The third signaling is received by the first radio and refraining from activating the second radio based on a capability of the first radio to perform the cell reselection procedure and performing the cell reselection procedure based on measurements associated with the one or more candidate serving cells. Receiving, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. Receiving, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. To activate at least one of the first radio or the second radio, receiving, via the first radio, a WUS triggering the cell reselection procedure, activating the second radio for the cell reselection procedure, receiving, via the second radio, an SSB based on activating the second radio to perform the cell reselection procedure, and refraining from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message based on the WUS triggering the cell reselection procedure. The WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated withthe candidate serving cell. To activate at least one of the first radio or the second radio, refraining from activating the second radio based on a capability of the first radio to perform the cell reselection procedure, and performing, using the first radio, the cell reselection procedure. Receiving, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, where the cell reselection procedure is based on the respective frequencies. Measuring one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, where the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells. The measurement is associated with the second radio, and to activate at least one of the first radio or the second radio, activating the first radio based on the measurement being above the at least one threshold value and deactivating the second radio based on the measurement being above the at least one threshold value. The measurement is associated with the first radio, and to activate at least one of the first radio or the second radio, activating the second radio based on the measurement being below the at least one threshold value. The first radio is associated with a first power consumption level, and the second radio is associated with a second power consumption level different than the first power consumption level.

[0111] Additionally, or alternatively, the UE 600 may support a first radio, a second radio, at least one memory, and at least one processor coupled with the at least one memory and configured to cause the UE to receive first signaling associated with a measurement, the measurement associated with a serving cell, activate at least one of the first radio or the second radio based on the measurement satisfying at least one threshold value, and monitor for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

[0112] Additionally, the UE 600 may be configured to support any one or combination of to receive third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. To activate at least one of the first radio or the second radio, the UE 600 refrains from activating the first radio during the one or more inactive time periods. To activate at least one of the first radio or the second radio, the UE 600 refrains from activating the first radio based on the received third signaling. To activate at least one of the firstradio or the second radio, the UE 600 activates the first radio based on a duration of the one or more active time periods satisfying a threshold value. The third signaling is received by the first radio, and the UE 600 receives a WUS prior to the one or more active time periods and the one or more inactive time periods and activates the second radio for the cell reselection procedure, where to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure. The WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. The WUS includes an indication of the one or more active time periods and the one or more inactive time periods, and the UE 600 refrains from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message. The UE 600 activates the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods. The third signaling is received by the first radio, and the UE 600 refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure and performs the cell reselection procedure based on measurements associated with the one or more candidate serving cells. The UE 600 receives, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. The UE 600 receives, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. To activate at least one of the first radio or the second radio, the UE 600 receives, via the first radio, a WUS triggering the cell reselection procedure, activates the second radio for the cell reselection procedure, receives, via the second radio, an SSB based on activating the second radio to perform the cell reselection procedure, and refrains from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message based on the WUS triggering the cell reselection procedure. The WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell. To activate at least one of the first radio or the second radio, the UE 600 refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure, and performs, using the first radio, the cell reselection procedure. The UE 600 receives, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, where the cell reselection procedure is based on the respective frequencies. The UE 600 measures one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, where the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells. The measurement isassociated with the second radio, and to activate at least one of the first radio or the second radio, the UE 600 activates the first radio based on the measurement being above the at least one threshold value and deactivates the second radio based on the measurement being above the at least one threshold value. The measurement is associated with the first radio, and to activate at least one of the first radio or the second radio, the UE 600 activates the second radio based on the measurement being below the at least one threshold value. The first radio is associated with a first power consumption level, and the second radio is associated with a second power consumption level different than the first power consumption level.

[0113] The controller 606 may manage input and output signals for the UE 600. The controller 606 may also manage peripherals not integrated into the UE 600. In some implementations, the controller 606 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 606 may be implemented as part of the processor 602.

[0114] In some implementations, the UE 600 may include at least one transceiver 608. In some other implementations, the UE 600 may have more than one transceiver 608. The transceiver 608 may represent a wireless transceiver. The transceiver 608 may include one or more receiver chains 610, one or more transmitter chains 612, or a combination thereof.

[0115] A receiver chain 610 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 610 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 610 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 610 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 610 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0116] A transmitter chain 612 may be configured to generate and transmit signals (e.g., control information, data, packets). The transmitter chain 612 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitudemodulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or QAM. The transmitter chain 612 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 612 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0117] Figure 7 illustrates an example of a processor 700 in accordance with aspects of the present disclosure. The processor 700 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 700 may include a controller 702 configured to perform various operations in accordance with examples as described herein. The processor 700 may optionally include at least one memory 704, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 700 may optionally include one or more arithmetic-logic units (ALUs) 706. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses). In some examples, a low power processor implements one or more of the functionalities of the processor 700.

[0118] The processor 700 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 700) or other memory (e.g., random access memory (RAM), read-only memory (ROM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), static RAM (SRAM), ferroelectric RAM (FeRAM), magnetic RAM (MRAM), resistive RAM (RRAM), flash memory, phase change memory (PCM), and others).

[0119] The controller 702 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 700 to cause the processor 700 to support various operations in accordance with examples as described herein. For example, the controller 702 may operate as a control unit of the processor 700, generating control signals that manage the operation of various components of the processor 700. These control signals includeenabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

[0120] The controller 702 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 704 and determine subsequent instruction(s) to be executed to cause the processor 700 to support various operations in accordance with examples as described herein. The controller 702 may be configured to track memory addresses of instructions associated with the memory 704. The controller 702 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 702 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 700 to cause the processor 700 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 702 may be configured to manage flow of data within the processor 700. The controller 702 may be configured to control transfer of data between registers, ALUs 706, and other functional units of the processor 700.

[0121] The memory 704 may include one or more caches (e.g., memory local to or included in the processor 700 or other memory, such as RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 704 may reside within or on a processor chipset (e.g., local to the processor 700). In some other implementations, the memory 704 may reside external to the processor chipset (e.g., remote to the processor 700).

[0122] The memory 704 may store computer-readable, computer-executable code including instructions that, when executed by the processor 700, cause the processor 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 702 and / or the processor 700 may be configured to execute computer-readable instructions stored in the memory 704 to cause the processor 700 to perform various functions. For example, the processor 700 and / or the controller 702 may be coupled with or to the memory 704, the processor 700, and the controller 702, and may be configured to perform various functions described herein. In some examples, the processor 700 may include multiple processors and the memory 704 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

[0123] The one or more ALUs 706 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 706 may reside within or on a processor chipset (e.g., the processor 700). In some other implementations, the one or more ALUs 706 may reside external to the processor chipset (e.g., the processor 700). One or more ALUs 706 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 706 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 706 may be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 706 may support logical operations such as AND, OR, exclusive-OR (XOR), not-OR (NOR), and not-AND (NAND), enabling the one or more ALUs 706 to handle conditional operations, comparisons, and bitwise operations.

[0124] The processor 700 may support wireless communication in accordance with examples as disclosed herein. The processor 700 may be configured to or operable to support at least one controller coupled with at least one memory and configured to cause the processor to receive first signaling associated with a measurement, the measurement associated with a serving cell, activate at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value, and monitor for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

[0125] Additionally, or alternatively, the processor 700 may be configured to or operable to support any one or combination of to receive third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. To activate at least one of the first radio or the second radio, the processor 700 refrains from activating the first radio during the one or more inactive time periods. To activate at least one of the first radio or the second radio, the processor 700 refrains from activating the first radio based on the received third signaling. To activate at least one of the first radio or the second radio, the processor 700 activates the first radio based on a duration of the one or more active time periods satisfying a threshold value. The third signaling is received by the first radio, and the processor 700 receives a WUS prior to the one or more active time periods and the one or more inactive time periods and activates thesecond radio for the cell reselection procedure, where to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure. The WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. The WUS includes an indication of the one or more active time periods and the one or more inactive time periods, and the processor 700 refrains from communicating signaling including one or more of a PEI, a paging occasion, or a RACH message. The processor 700 activates the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods. The third signaling is received by the first radio, and the processor 700 refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure and performs the cell reselection procedure based on measurements associated with the one or more candidate serving cells. The processor 700 receives, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. The processor 700 receives, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. To activate at least one of the first radio or the second radio, the processor 700 receives, via the first radio, a WUS triggering the cell reselection procedure, activates the second radio for the cell reselection procedure, receives, via the second radio, an SSB based on activating the second radio to perform the cell reselection procedure, and refrains from communicating signaling including one or more of an PEI, a paging occasion, or a RACH message based on the WUS triggering the cell reselection procedure. The WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell. To activate at least one of the first radio or the second radio, the processor 700 refrains from activating the second radio based on a capability of the first radio to perform the cell reselection procedure, and performs, using the first radio, the cell reselection procedure. The processor 700 receives, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, where the cell reselection procedure is based on the respective frequencies. The processor 700 measures one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, where the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells. The measurement is associated with the second radio, and to activate at least one of the first radio or the second radio, the processor 700 activates the first radio based on the measurement being above the at least one threshold value and deactivates the second radiobased on the measurement being above the at least one threshold value. The measurement is associated with the first radio, and to activate at least one of the first radio or the second radio, the processor 700 activates the second radio based on the measurement being below the at least one threshold value. The first radio is associated with a first power consumption level, and the second radio is associated with a second power consumption level different than the first power consumption level.

[0126] Figure 8 illustrates an example of an NE 800 in accordance with aspects of the present disclosure. The NE 800 may include a processor 802, a memory 804, a controller 806, and a transceiver 808. The processor 802, the memory 804, the controller 806, or the transceiver 808, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0127] The processor 802, the memory 804, the controller 806, or the transceiver 808, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0128] The processor 802 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 802 may be configured to operate the memory 804. In some other implementations, the memory 804 may be integrated into the processor 802. The processor 802 may be configured to execute computer-readable instructions stored in the memory 804 to cause the NE 800 to perform various functions of the present disclosure.

[0129] The memory 804 may include volatile or non-volatile memory. The memory 804 may store computer-readable, computer-executable code including instructions when executed by the processor 802 cause the NE 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 804 or another type ofmemory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0130] In some implementations, the processor 802 and the memory 804 coupled with the processor 802 may be configured to cause the NE 800 to perform one or more of the functions described herein (e.g., executing, by the processor 802, instructions stored in the memory 804). For example, the processor 802 may support wireless communication at the NE 800 in accordance with examples as disclosed herein. The NE 800 may be configured to or operable to support means for transmitting first signaling associated with a measurement, the measurement associated with a serving cell, and transmitting second signaling to trigger activation of at least one of a first radio or a second radio of a UE for a cell reselection procedure corresponding to a candidate serving cell from one or more candidate serving cells, the activation based on the measurement satisfying at least one threshold value.

[0131] Additionally, or alternatively, the NE 800 may be configured to or operable to support means for any one or combination of transmitting third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. Transmitting a WUS prior to the one or more active time periods and the one or more inactive time periods. The WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. The WUS includes an indication of the one or more active time periods and the one or more inactive time periods. The WUS includes a threshold duration for activating the second radio prior to an inactive time period of the one or more inactive time periods. Transmitting a low power synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. Transmitting a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. Transmitting, to the first radio, a WUS triggering the cell reselection procedure, where the second radio is activated for the cell reselection procedure, and transmitting, to the second radio, one or more SSBs corresponding to the cell reselection procedure. The WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell. Transmitting, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells.

[0132] Additionally, or alternatively, the NE 800 may support at least one memory and at least one processor coupled with the at least one memory and configured to cause the NE 800 to transmit first signaling associated with a measurement, the measurement associated with a serving cell, and transmit second signaling to trigger activation of at least one of a first radio or a second radio of a UE for a cell reselection procedure corresponding to a candidate serving cell from one or more candidate serving cells, the activation based on the measurement satisfying at least one threshold value.

[0133] Additionally, the NE 800 may be configured to support any one or combination of to transmit third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell. The NE 800 transmits a WUS prior to the one or more active time periods and the one or more inactive time periods. The WUS includes a plurality of cell reselection parameters associated with the cell reselection procedure. The WUS includes an indication of the one or more active time periods and the one or more inactive time periods. The WUS includes a threshold duration for activating the second radio prior to an inactive time period of the one or more inactive time periods. The NE 800 transmits a low power synchronization signal based on the first radio failing to support a waveform with an overlaid OFDM sequence. The NE 800 transmits a synchronization signal based on the first radio supporting a waveform with an overlaid OFDM sequence. The NE 800 transmits, to the first radio, a WUS triggering the cell reselection procedure, where the second radio is activated for the cell reselection procedure, and transmits, to the second radio, one or more SSBs corresponding to the cell reselection procedure. The WUS includes one or more of a cell identifier associated with the candidate serving cell or a frequency associated with the candidate serving cell. The NE 800 transmits, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells.

[0134] The controller 806 may manage input and output signals for the NE 800. The controller 806 may also manage peripherals not integrated into the NE 800. In some implementations, the controller 806 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 806 may be implemented as part of the processor 802.

[0135] In some implementations, the NE 800 may include at least one transceiver 808. In some other implementations, the NE 800 may have more than one transceiver 808. The transceiver 808 may represent a wireless transceiver. The transceiver 808 may include one or more receiver chains 810, one or more transmitter chains 812, or a combination thereof.

[0136] A receiver chain 810 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 810 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 810 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 810 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 810 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0137] A transmitter chain 812 may be configured to generate and transmit signals (e.g., control information, data, packets). The transmitter chain 812 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as AM, FM, or digital modulation schemes like PSK or QAM. The transmitter chain 812 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 812 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0138] Figure 9 illustrates a flowchart of a method 900 in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, some of the operations and steps may be optional.

[0139] In some examples, at 902, the method may include receiving first signaling associated with a measurement, the measurement associated with a serving cell. The operations of 902 may beperformed in accordance with examples as described herein. In some implementations, aspects of the operations of 902 may be performed by a UE as described with reference to Figure 6.

[0140] At 904, the method may include activating at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value. The operations of 904 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 904 may be performed by a UE as described with reference to Figure 6.

[0141] At 906, the method may include monitoring for second signaling associated with a cell reselection procedure via the first radio or the second radio, where the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells. The operations of 906 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 906 may be performed by a UE as described with reference to Figure 6.

[0142] Figure 10 illustrates a flowchart of a method 1000 in accordance with aspects of the present disclosure. The operations of the method may be implemented by an NE as described herein. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0143] At 1002, the method may include transmitting first signaling associated with a measurement, the measurement associated with a serving cell. The operations of 1002 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1002 may be performed by an NE as described with reference to Figure 8.

[0144] At 1004, the method may include transmitting second signaling to trigger activation of at least one of a first radio or a second radio of a UE for a cell reselection procedure corresponding to a candidate serving cell from one or more candidate serving cells, the activation based on the measurement satisfying at least one threshold value. The operations of 1004 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1004 may be performed by an NE as described with reference to Figure 8.

[0145] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

CLAIMSWhat is claimed is:

1. A UE for wireless communication, comprising: a first radio; a second radio; at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive first signaling associated with a measurement, the measurement associated with a serving cell; activate at least one of the first radio or the second radio based on the measurement satisfying at least one threshold value; and monitor for second signaling associated with a cell reselection procedure via the first radio or the second radio, wherein the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

2. The UE of claim 1 , wherein the at least one processor is further configured to cause the UE to receive third signaling indicating one or more active time periods for the serving cell and one or more inactive time periods of the serving cell.

3. The UE of claim 2, wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to refrain from activating the first radio during the one or more inactive time periods.

4. The UE of claim 2, wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to refrain from activating the first radio based on the third signaling.

5. The UE of claim 2, wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to activate the first radio based on a duration of the one or more active time periods satisfying a threshold value.

6. The UE of claim 2, wherein the third signaling is received by the first radio, and wherein the at least one processor is further configured to cause the UE to: receive a wake-up signal (WUS) prior to the one or more active time periods and the one or more inactive time periods; and activate the second radio for the cell reselection procedure, wherein to activate the second radio is based on a capability of the first radio to perform the cell reselection procedure.

7. The UE of claim 6, wherein the at least one processor is further configured to cause the UE to activate the second radio a threshold duration prior to an inactive time period of the one or more inactive time periods.

8. The UE of claim 2, wherein the third signaling is received by the first radio, and wherein the at least one processor is further configured to cause the UE to: refrain from activating the second radio based on a capability of the first radio to perform the cell reselection procedure; and perform the cell reselection procedure based on measurements associated with the one or more candidate serving cells.

9. The UE of claim 1, wherein the at least one processor is further configured to cause the UE to receive, from the serving cell, a synchronization signal based on the first radio failing to support a waveform with an overlaid orthogonal frequency division multiplexing (OFDM) sequence.

10. The UE of claim 1, wherein the at least one processor is further configured to cause the UE to receive, from the serving cell, a synchronization signal based on the first radio supporting a waveform with an overlaid orthogonal frequency division multiplexing (OFDM) sequence.

11. The UE of claim 1 , wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to: receive, via the first radio, a wake-up signal (WUS) triggering the cell reselection procedure; activate the second radio for the cell reselection procedure; receive, via the second radio, a synchronization signal block (SSB) based on activating the second radio to perform the cell reselection procedure; andrefrain from communicating signaling comprising one or more of an early paging indicator, a paging occasion, or a random-access channel message based on the WUS triggering the cell reselection procedure.

12. The UE of claim 1, wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to: refrain from activating the second radio based on a capability of the first radio to perform the cell reselection procedure; and perform, using the first radio, the cell reselection procedure.

13. The UE of claim 12, wherein the at least one processor is further configured to cause the UE to receive, via the first radio, third signaling indicating respective frequencies corresponding to the one or more candidate serving cells, wherein the cell reselection procedure is based on the respective frequencies.

14. The UE of claim 12, wherein the at least one processor is further configured to cause the UE to measure one or more synchronization signals to determine respective signal quality values of the one or more candidate serving cells, wherein the cell reselection procedure is based on the respective signal quality values of the one or more candidate serving cells.

15. The UE of claim 1, wherein the measurement is associated with the second radio, and wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to: activate the first radio based on the measurement being above the at least one threshold value; and deactivate the second radio based on the measurement being above the at least one threshold value.

16. The UE of claim 1 , wherein the measurement is associated with the first radio, and wherein to activate at least one of the first radio or the second radio, the at least one processor is further configured to cause the UE to activate the second radio based on the measurement being below the at least one threshold value.

17. The UE of claim 1, wherein: the first radio is associated with a first power consumption level; and the second radio is associated with a second power consumption level different than the first power consumption level.

18. A processor for wireless communication, comprising: at least one controller coupled with at least one memory and configured to cause the processor to: receive first signaling associated with a measurement, the measurement associated with a serving cell; activate at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value; and monitor for second signaling associated with a cell reselection procedure via the first radio or the second radio, wherein the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

19. A method performed by a user equipment (UE), the method comprising: receiving first signaling associated with a measurement, the measurement associated with a serving cell; activating at least one of a first radio or a second radio based on the measurement satisfying at least one threshold value; and monitoring for second signaling associated with a cell reselection procedure via the first radio or the second radio, wherein the cell reselection procedure corresponds to selecting a candidate serving cell from one or more candidate serving cells.

20. A base station for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the base station to: transmit first signaling associated with a measurement, the measurement associated with a serving cell; andtransmit second signaling to trigger activation of at least one of a first radio or a second radio of a user equipment (UE) for a cell reselection procedure corresponding to a candidate serving cell from one or more candidate serving cells, the activation based on the measurement satisfying at least one threshold value.

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