Cell selection using a low power processor

Abstract

Various aspects of the present disclosure relate to cell selection using a low power processor. A user equipment (UE) includes one or more main radios corresponding to one or more radio access technologies (RATs) or frequencies and also includes a low power radio (LR). The LR uses various information to perform cell measurement and a cell selection or reselection procedure (e.g., according to a priority list provided by a network equipment). After performing the cell selection or reselection, the LR may wake up one or both of the corresponding RAT or main radio for the selected cell, allowing other RATs or main radios in the UE to remain in a low power mode (e.g., powered off or in a sleep state).

Description

CELL SELECTION USING A LOW POWER PROCESSORRELATED APPLICATION

[0001] This application claims priority to U.S. Patent Application Serial No. 63 / 604,140 filed November 29, 2023 entitled “CELL SELECTION USING A LOW POWER PROCESSOR,” 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 selecting cells.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 communication 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)).

[0004] The UEs consume power and the amount of power consumed directly affects the battery life of UEs with batteries or other rechargeable devices. Various techniques may be used in order to reduce power usage in the UEs.SUMMARY

[0005] 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.

[0006] Some implementations of the method and apparatuses described herein may further include a UE for wireless communication. The UE receives, from a network entity (NE), a first signaling indicating a synchronization signal; selects, by a low power processor of the at least one processor, a cell based at least in part on the synchronization signal, one or more radio frequency (RF) capabilities of the UE, and one or more criteria; and tunes to a synchronization channel of the selected cell.

[0007] In some implementations of the method and apparatuses described herein, the UE includes a main radio and a low power radio that includes the low power processor. Additionally or alternatively, the selected cell corresponds to a radio access technology (RAT) of multiple RATs, and the low power processor is configured to cause the UE to select the cell and tune to the synchronization channel of the selected cell without waking a main radio of the UE that corresponds to the RAT. Additionally or alternatively, to select the cell based on the one or more criteria is to select a strongest cell of multiple cells accessible to the UE. Additionally or alternatively, to select the cell based on the one or more criteria is to select a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the UE. Additionally or alternatively, to select the cell based on the one or more criteria is to select the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells. Additionally or alternatively, the one or more capabilities of the UE include one or both of radio access technologies (RATs) supported by the UE or frequencies supported by the UE. Additionally or alternatively, the UE receives, from the NE, a wake-up signal; and selects the cell inresponse to the wake-up signal. Additionally or alternatively, the UE selects the cell by selecting a cell containing a RAT indicated in the wake-up signal. Additionally or alternatively, the UE receives, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and selects a new cell based at least in part on the one or more criteria. Additionally or alternatively, the one or more criteria include a RAT indicator for the selected cell, and the low power processor wakes up a main baseband processor of the UE that corresponds to the RAT indicator. Additionally or alternatively, the one or more criteria include an expected type of service. Additionally or alternatively, the low power processor performs the expected type of service in response to the low power processor being able to perform the expected type of service. Additionally or alternatively, the one or more criteria include a redistribution indicator. Additionally or alternatively, the UE to receives, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; wakes up, in response to the low power processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allows the main baseband processor to select a new cell.

[0008] Some implementations of the method and apparatuses described herein may further include a base station for wireless communication. The base station transmits, to a UE, a first signaling indicating to the UE to perform cell reselection corresponding to one or more criteria; andreceives, from the UE, a second signaling indicating the UE has selected a new cell.

[0009] In some implementations of the method and apparatuses described herein, the one or more criteria include a RAT indicator for the new cell. Additionally or alternatively, the one or more criteria include an expected type of service. Additionally or alternatively, the one or more criteria include a redistribution indicator.

[0010] Some implementations of the method and apparatuses described herein may further include a processor for wireless communication. The processor includes a low power processor and the processor receives, from a NE, a first signaling indicating a synchronization signal; selects a cell based at least in part on the synchronization signal, one or more RF capabilities of a UE that includes the processor, and one or more criteria; and allows the UE to tune to a synchronization channel of the selected cell.

[0011] In some implementations of the method and apparatuses described herein, wherein the UE includes a main radio and a low power radio that includes the low power processor.Additionally or alternatively, the selected cell corresponds to a RAT of multiple RATs, and the processor selects the cell and tune to the synchronization channel of the selected cell without waking a main radio of the UE and wherein the UE corresponds to the RAT. Additionally or alternatively, to select the cell based on the one or more criteria is to select a strongest cell of multiple cells accessible to the processor. Additionally or alternatively, to select the cell based on the one or more criteria is to select a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the processor. Additionally or alternatively, to select the cesll based on the one or more criteria is to select the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells. Additionally or alternatively, the one or more capabilities of the UE include one or both of RATs supported by the UE or frequencies supported by the UE. Additionally or alternatively, the processor receives, from the NE, a wake-up signal; and selects the cell in response to the wake-up signal. Additionally or alternatively, the processor selects the cell by selecting a cell containing a RAT indicated in the wake-up signal. Additionally or alternatively, the processor receives, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and selects a new cell based at least in part on the one or more criteria. Additionally or alternatively, the one or more criteria include a RAT indicator for the selected cell, and the processor wakes up a main baseband processor of the UE that corresponds to the RAT indicator. Additionally or alternatively, the one or more criteria include an expected type of service. Additionally or alternatively, the processor performs the expected type of service in response to the processor being able to perform the expected type of service. Additionally or alternatively, the one or more criteria include a redistribution indicator. Additionally or alternatively, the processor to receives, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; wakes up, in response to the processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allows the main baseband processor to select a new cell.

[0012] Some implementations of the method and apparatuses described herein may further include a method performed by a UE, the method comprising: receiving, from a NE, a firstsignaling indicating a synchronization signal; selecting, by a low power processor of the UE, a cell based at least in part on the synchronization signal, one or more RF capabilities of the UE, and one or more criteria; and tuning to a synchronization channel of the selected cell.

[0013] In some implementations of the method and apparatuses described herein, the UE includes a main radio and a low power radio that includes the low power processor. Additionally or alternatively, the selected cell corresponds to a RAT of multiple RATs, and further comprising selecting the cell and tuning to the synchronization channel of the selected cell without waking a main radio of the UE that corresponds to the RAT. Additionally or alternatively, selecting the cell based on the one or more criteria comprises selecting a strongest cell of multiple cells accessible to the UE. Additionally or alternatively, selecting the cell based on the one or more criteria comprises selecting a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the UE. Additionally or alternatively, selecting the cell based on the one or more criteria comprises selecting the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells. Additionally or alternatively, the one or more capabilities of the UE include one or both of RATs supported by the UE or frequencies supported by the UE. Additionally or alternatively, the method comprises: receiving, from the NE, a wake-up signal; and selecting the cell in response to the wake-up signal. Additionally or alternatively, selecting the includes selecting a cell containing a RAT indicated in the wake-up signal. Additionally or alternatively, the method comprises receiving, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and selecting a new cell based at least in part on the one or more criteria. Additionally or alternatively, the one or more criteria include a RAT indicator for the selected cell, and the method further comprises waking up a main baseband processor of the UE that corresponds to the RAT indicator. Additionally or alternatively, the one or more criteria include an expected type of service.Additionally or alternatively, the method further comprises performing, by the low power processor, the expected type of service in response to the low power processor being able to perform the expected type of service. Additionally or alternatively, the one or more criteria include a redistribution indicator. Additionally or alternatively, the method further comprises receiving, by the low power processor from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; waking up, inresponse to the low power processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allowing the main baseband processor to select a new cell.

[0014] Some implementations of the method and apparatuses described herein may further include a method performed by a base station, the method comprising: transmitting, to a UE, a first signaling indicating to the UE to perform cell reselection corresponding to one or more criteria; and receiving, from the UE, a second signaling indicating the UE has selected a new cell.

[0015] In some implementations of the method and apparatuses described herein, the one or more criteria include a RAT indicator for the new cell. Additionally or alternatively, the one or more criteria include an expected type of service. Additionally or alternatively, the one or more criteria include a redistribution indicator.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.

[0017] Figure 2 illustrates an example of a low power wake up radio design architecture in accordance with aspects of the present disclosure.

[0018] Figure 3 illustrates an example of performing cell selection in accordance with aspects of the present disclosure.

[0019] Figure 4 illustrates an example of performing cell reselection in accordance with aspects of the present disclosure.

[0020] Figure 5 illustrates an example of performing cell reselection in accordance with aspects of the present disclosure.

[0021] Figure 6 illustrates an example of a UE in accordance with aspects of the present disclosure.

[0022] Figure 7 illustrates an example of a processor in accordance with aspects of the present disclosure.

[0023] Figure 8 illustrates an example of a NE in accordance with aspects of the present disclosure.

[0024] Figure 9 illustrates a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.

[0025] Figure 10 illustrates a flowchart of a method performed by a NE in accordance with aspects of the present disclosure.DETAILED DESCRIPTION

[0026] UEs in the wireless communications system communicate with a NE such as a base station. The NE provides a wireless coverage area referred to as a cell and the UE selects a cell, reselects a cell in certain situations (e.g., the UE has moved, a base station is becoming overloaded and redistributes the UE to a different cell), and so forth. The initial cell search, the cell selection, and the cell reselection is offloaded to a low power radio (LR) and in one or more implementations the NE provides information to the LR of idle mode UEs supporting multi-RAT systems. This information can include an intra-system-inter-frequency and inter-system frequency priority list, indicating the priorities of different frequencies within a RAT (e.g., 5G or 6G) as well as across different RATs (e.g., 5G and 6G). The LR uses the information to perform cell measurement and a cell selection or reselection procedure according to the provided priority list. After performing the cell selection or reselection, the LR may wake up one or both of the corresponding RAT or main radio for the selected cell, allowing other RATs or main radios in the UE to remain in a low power mode (e.g., powered off or in a sleep state). Accordingly, after performing the cell selection or reselection, the UE is able to camp on the selected cell (e.g., tune to a synchronization channel of the selected cell).

[0027] In one or more implementations, the NE indicates the type of service to the UE, such as quality of service (QoS) class identifier (QCI), data rate, energy saving metric, and so forth, or provides a RAT indicator as part of the information to the LR. With this information the LR determines whether to wake up one or both of corresponding functionality of the main radio or the RAT.

[0028] The LR of the UE is different than a traditional low power wake-up radio (LP-WUR) in that the LR performs cell selection and cell reselection. A LP-WUR listens for a wake-up signal andwakes up the main radio in response to the wake-up signal, allowing the main radio to perform cell selection and reselection. In contrast, using the techniques discussed herein the LR listens for the wake-up signal and performs cell selection and cell reselection in response to the wake-up signal without needing to wake up the main radio.

[0029] By offloading the cell selection and reselection to the LR, the main radios can remain in a low power or sleep mode while cell measurement, cell selection, or cell reselection for a UE that includes multiple RATs is performed. This use of the LR conserves power in the UE by allowing a lower power radio rather than a higher power main radio to perform the cell selection and reselection.

[0030] Aspects of the present disclosure are described in the context of a wireless communications system.

[0031] 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 NE 102, one or more UE 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.

[0032] The one or more NE 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 next-generation 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.

[0033] 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 (e.g., 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 nonterrestrial 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 NE 102.

[0034] The one or more UE 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 Internet-of-Things (loT) device, an Internet-of- Everything (loE) device, or machine-type communication (MTC) device, among other examples.

[0035] 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.

[0036] 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 NE 102 or the CN 106 through one or more backhaul links (e.g., SI, N2, N6, or other network interface). In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 maycommunicate 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).

[0037] 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 (e.g., data bearers, signal bearers, etc.) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.

[0038] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an SI, N2, N6, or other 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).

[0039] 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 andamong 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.

[0040] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., / r=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., / r=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., / r=l) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., / r=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., / r=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., / r=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.

[0041] 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.

[0042] 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 subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols). In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclicprefix (e.g., applicable for 60 kHz subcarrier spacing), a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., / r=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.

[0043] 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.

[0044] 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 subcarrier spacing; a second numerology (e.g., / r=l), which includes 30 kHz subcarrier spacing; and a third numerology (e.g., / r=2), which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies). For example, FR2 may be associated with a third numerology (e.g., / r=2), which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., / r=3), which includes 120 kHz subcarrier spacing.

[0045] The UE 104 includes multiple main radios. A main radio includes a receiver that receives signals in the EM spectrum, a processor that takes various actions based on these received signals (also referred to as the main processor or main base band processor), and optionally a transmitter that transmits signals in the EM spectrum. In one or more implementations the UE 104 includes a different radio for different RATs, such as one radio for 5G and one radio for 6G. A main radio can be placed into a low power mode in which the main radio consumes little or no power.When in the low power mode the main radio may also be referred to as being asleep or switched off. Transitioning the main radio to a higher power mode is also referred to as waking up or switching on the main radio.

[0046] The UE 104 also includes a LR. The LR includes a receiver that receives signals in the EM spectrum, a processor that takes various actions based on these received signals (also referred to as a low power processor), and optionally a transmitter that transmits signals in the EM spectrum. The LR consumes less power than the main radios of the UE when woken up or switched on.

[0047] UE 104 in the wireless communications system 100 communicate with an NE 102. Each NE 102 provides a wireless coverage area referred to as a cell and the UE 104 selects a cell, reselects a cell in certain situations (e.g., the UE 104 has moved, the NE 102 is overloaded and redistributes the UE 104 to a different cell), and so forth. The initial cell search, the cell selection, and the cell reselection is performed by the LR of the UE 104. In one or more implementations, the NE 102 provides information to the LR of the UE 104 of idle mode UE supporting multi-RAT systems. This information can include the intra-system-inter-frequency and inter-system frequency priority list, indicating the priorities of different frequencies within a RAT (e.g., intra-system-inter- frequency) as well as across different RATs (e.g., inter-system frequency). The LR of the UE 104 uses the information to perform cell measurement and a cell selection or reselection procedure according to the provided priority list. After performing the cell selection or reselection, the LR may wake up one or both of the corresponding RAT or main radio for the selected cell, allowing other RATs in the UE to remain in a low power mode (e.g., powered off or in a sleep state).

[0048] In one or more implementations, the NE 102 indicates the type of service to the UE 104, such as quality of service (UE) class identifier (QCI), data rate, energy saving metric, and so forth, or provides a RAT indicator as part of the information to the UE 104. With this information the UE of the UE 104 determines whether to wake up one or both of corresponding functionality of the main radio or the RAT.

[0049] The low-power wake up signal (LP-WUS or LPWUS) or low-power wake up radio (LP- WUR or LPWUR) for power-sensitive, small form-factor devices including Internet of things (loT) use cases (such as industrial sensors, controllers) and wearables is taken into consideration. Otheruse cases are also taken into consideration, such as extended reality (XR) or smart glasses, smart phones, and so forth.

[0050] Figure 2 illustrates an example 200 of a low power wake up radio design architecture in accordance with aspects of the present disclosure. The example 200 illustrates a base station 202 and a UE 204. The base station 202 is, for example, a NE 102 of FIG. 1. The UE 204 is, for example, a UE 104 of FIG. 1. The base station 202 transmits a LP-WUS that is received by the LP- WUR of the UE 204, which can wake up the main radio (e.g., main receiver) of the UE 204. The UE 204 then communicates with the base station 202 using the main radio.

[0051] The design of low power wake up signal residing in the low power wake up radio which may be used to wake up the main radio is taken into consideration. For waveform generation the following observations are taken into consideration: flat spectrum in frequency domain provides robustness against frequency selective fading compared to concentrated energy in frequency domain; for on off keying (OOK) 4 (OOK-4), sequence before discrete Fourier transform (DFT) or low-band spectrum (LS) with variation in phase via such as Zadoff-Chu (ZC), M-sequence or quadrature amplitude modulation (QAM) sequence can achieve more flattened spectrum; knowledge of one or more sequences used in LP-WUS waveform generation may improve performance for at least a receiver with in-phase and quadrature (I / Q) branches; for waveform- option-3, a harmonized design that accommodates 00K-1 / 00K-4 and orthogonal frequency division multiplexing (OFDM) waveform, e.g., specified overlayed orthogonal frequency division multiplexing (OFDM) sequences over OOK symbol; for radio resource control (RRC) IDLE / INACTIVE, in addition to existing primary synchronization signal (PSS) or secondary synchronization signal (SSS), low power synchronization signal (LP-SS) (e.g., one or both of OOK- 1 / or OOK-4 waveform with or without overlayed OFDM sequences with potential further down selection in WI phase) for LP-WUR that cannot receive existing PSS / SSS, is supported for synchronization and / or radio resource management (RRM) for serving cell.

[0052] The problem of power saving as well as coverage associated with the LP-WUR is taken into consideration. The receiver based on envelope detector receiving the OOK waveform maximizes the power saving gain compared to the in-phase and quadrature (IQ) correlator, however the coverage of receiver based on envelope detector is limited compared to the coverage of the IQ correlator receiver type.

[0053] There are multiple wake-up signal (WUS) solutions in the 3rd Generation Partnership Project (3GPP) for targeting device power savings for different RAT or form factors. These solutions include long-term evolution for machines (LTE-M) and narrowband loT (NB-IoT); NR DCI_WUS 2_6 and 2_7; and LP_WUR for reduced capability (Red-Cap). Some of these solutions are having backward compatibility, thus support for both legacy solutions and the newly developed solutions may lead to an inability to extract optimal device power savings. Also these power saving techniques are being developed for 6G, hence a unified design of LP-WUR considering multiple RAT such as 5G and 6G can be beneficial.

[0054] The multi-RAT cell selection procedure starts with Intra-system-inter-frequency and compare with higher priority Inter-System frequency measurements and such priorities are broadcasted in system information blocks (SIBs) as part of cell reselection procedure. A drawback of such procedure may results in waking up the main radios of different RATs to perform cell selection and cell reselection.

[0055] Using the techniques discussed herein, a design for multi-RAT supporting device is provided that enhances the multi-RAT cell selection procedure and offloads the multi-RAT cell selection or reselection to the LR.

[0056] With respect to Inter-frequency and inter-RAT cell reselection criteria, if threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if a cell of a higher priority NR or EUTRAN RAT / frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT. Otherwise, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if: a cell of a higher priority RAT / frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT ; and more than 1 second has elapsed since the UE camped on the current serving cell.

[0057] The initial cell search, cell selection, and cell reselection is offloaded to the LR and the network provides an information to the LR of idle mode UEs supporting multi-RAT systems that includes the Intra-system-inter-frequency and inter-system frequency priority list. With that the LR performs cell measurement and finally performs a cell selection or reselection procedure accordingto the provided priority list. After performing the cell-selection or reselection the LR may wake up one or both of the corresponding RAT or main radio.

[0058] The network may further indicate the type of service, e.g., QCI, data rate, energy saving metric, and so forth, or a RAT indicator as part of the information to the LR. With such information the LR may decide to wake up corresponding functionality of the main radio or even RAT.Compared to solutions where the main radio, after receiving the priority list, performs the cell measurement and performs cell selection or reselection for a multi-RAT system, using the techniques discussed herein the LR receives the priority list and performs cell selection or reselection and performs RAT selection.

[0059] With respect to architecture, in one or more implementations, the low power wake up radio has a separate broadband (BB), RF chain and antenna compared to the main radio.Additionally or alternatively, the low power wake up radio has a separate BB but shared RF and antenna with the main radio. Additionally or alternatively, the low power wake up radio may have a shared BB, RF and antenna with the main radio. In dynamic spectrum sharing (DSS), a single low power processor may be connected to multiple BB radios where each of the BB radios may correspond to a RAT or a frequency.

[0060] With respect to types of receivers, in one or more implementations, the low power wake up radio has a heterodyne envelope detector implemented at intermediate frequency (IF) level. Additionally or alternatively, the low power wake up radio has a homodyne or zero-IF envelope detector at the BB. Additionally or alternatively, the low power wake up radio have a OFDM based sequence or signal with time domain or frequency domain correlation.

[0061] According to the harmonized waveform implementation, the OOK signal may contain a sequence or randomly modulated symbols like quadrature phase shift keying (QPSK) transmitted within the ON-duration of the OOK transmission to produce a flattened spectrum to improve against frequency selective fading. Such sequence may be ZC sequence, M-ary or Gold, golay sequence. In the off duration of OOK transmission, no signal transmission happens.

[0062] The low power processor discussed herein may contain one of the above use cases, architectures and receiver types.

[0063] The low power processor may be related to, but is not limited to, the following use case: standalone transmit (Tx) or receive (Rx) loT device, or the low power processor may be an auxiliary chip to wake-up the main processor.

[0064] Examples of measurement metric are signal quality, signal power, detection rate of LP- WUS / synch signal. These examples include:LP-received signal strength (RSSI) or Energy detection: linear average of total received power over a RSSI resource.LP-reference signal received power (RSRP): linear average of received power of resource of one or more reference signals or one or more signal parts.LP-signal to interference and noise ratio (SINR) = LP-RSRP / (power of interference and noise).LP-reference signal received quality (RSRQ)= [N x] LP-RSRP / LP-RSSI, where N is the factor of resource size difference for evaluation LP-RSRP and LP-RSSI.

[0065] A reference signal for performing measurements is, e.g., synchronization signal block (SSB) (PSS / SSS / physical broadcast channel (PBCH) demodulation reference signal (DMRS)), LP- WUS-waveform sequence, LP-SS, and so forth.

[0066] In one or more implementations, the initial cell search, cell selection of serving cell and cell reselection from neighboring cells is offloaded to the LR and the LR of idle mode UEs supporting multi-RAT system may receive information related to the cell selection or cell reselection. This information can include one or more of an intra-system-inter-frequency list and inter-system frequency list and their priorities, a public land mobile network (PLMN) list, serving quality and thresholds, expected service type, or expected RAT indicator.

[0067] A low power paging or early paging or wake-up or broadcast signaling using low power waveform and low power modulations schemes decodable by the LR is received by the LR, which can wake up the corresponding RAT or frequency of the main radio.

[0068] The main radio may have separate baseband processors, cores, or threads to run different RATs or frequencies and with such indication only the LR wakes up only the appropriate (e.g., necessary) baseband processors (e.g., those to run the indicated RAT or frequency).

[0069] With respect to initial cell selection offloaded to the LR, when the UE powers on, the LR performs the initial cell search with the synchronization signals from SSBs or LP-SS transmitted by the NE (e.g., base station).

[0070] The LR performs cell selection according to its supported RF capability and using at least one of the following procedures: 1) on each frequency, the LR searches for the strongest cell without any prior knowledge of the RF channels of 4G, 5G, or 6G frequencies and selects the strongest cell among them; 2) leveraging the stored information of frequencies and cell parameters which could be previously stored information at the UE from received measurement or previously detected cell; or 3) from the strongest cells in each frequency (e.g., according to procedure 1), the LR prioritizes the cell selection from the lowest frequency that maximizes the coverage for LR, and this lowest frequency may be (pre)-configured to the LR as stored frequency according to procedure 2).

[0071] Figure 3 illustrates an example 300 of performing cell selection in accordance with aspects of the present disclosure.

[0072] At 302, the method may include the UE that includes the LR being powered on.

[0073] At 304, the method may include the LR performing a cell search.

[0074] At 306, the method may include the LR finding the strongest one or more cells in ach frequency searched.

[0075] At 308, the method may include determining whether the LR is prioritizing low frequency. The LR may prioritize low frequency to, for example, reduce power usage by the UE.

[0076] At 310, if the LR is prioritizing low frequency, the LR selects the strongest cell in the lowest frequency range.

[0077] At 312, if the LR is not prioritizing low frequency, the LR selects the strongest cell among the frequency ranges.

[0078] With respect to cell reselection offloaded to the LR, the LR may receive low power signaling from the serving cell, which may contain one or more of an indication to perform cell reselection to corresponding RAT or frequency, expected type of service, RAT indicator, or redistribution indicator.

[0079] In one or more implementations the LR receives information containing at least one of expected type of service, RAT indicator, or redistribution indicator as part of the paging or early paging indicator or wake up indicator using a low power signaling.

[0080] In one or more implementations, the LR receives information from the system information broadcast related to the priority of the intra-system intra frequency, intra-system inter frequency, inter-system inter frequency using low power signaling. The LR may receive one or more mappings between a type of service, frequency and RAT using system information broadcast and such information may be used by the LR to select or reselect the cell accordingly.

[0081] The LR may perform cell reselection or the LR wakes up the main radio to perform the cell reselection, e.g., intra-system intra frequency, intra-system inter frequency, inter-system inter frequency depending on the expected type of service. In one or more implementations, the NE (e.g., a base station) may signal the RAT indicator to the LR using the low power signaling supported by LR, and thus LR may wake up the corresponding RAT’s main radio or trigger random access channel (RACH) from the RAT’s cell indicated by the NE. Additionally or alternatively, the LR may wake up the main radio to receive a paging message. If the LR could not provide such service related to high data rate then the LR wakes up the corresponding main radio supporting the supported service or RAT and the main radio performs the legacy cell reselection. However if the LR could provide such service related to low data rate then the LR performs cell reselection without waking up the main radio.

[0082] The LR, after receiving such information, may perform cell selection or reselection, from the list of measured RSRP of one or more cells according to the signal strength and within the threshold - select or reselect the cell with the indicated RAT or frequency or type of service mapped to a certain RAT or frequency.

[0083] The LR may perform cell selection or reselection from the list of measured RSRP of one or more cells and the priority of the intra-system intra frequency, intra-system-inter-frequency andinter-system inter-frequency where such priority may be indicated using one or more of LP-WUS, paging, or early paging indication. When the UE switches from the main radio to LR based on the entry condition of LR fulfilling the serving cell quality, the main radio may provide a list of frequencies preferred for LR and may trigger cell reselection so that LR may determine cell quality from the list of frequencies and select the strongest cell from the list. In one example, the main radio provides a list of Sub 1 GHz frequencies that priorities the coverage for LR. The main radio may also trigger LR’s cell reselection to help LR select a suitable cell where LR’s power saving is enabled which means transmission of low power wake up signal, low power synchronization signal by a cell etc. The cell broadcast signaling such as PBCH or SIBs may contain an indicator whether the cell supports power saving features such as low power wake up signal, synchronization signal etc.

[0084] Ligure 4 illustrates an example 400 of performing cell reselection in accordance with aspects of the present disclosure.

[0085] At 402, the method may include the LR receiving information related to the expected traffic (e.g., an expected type of service).

[0086] At 404, the method may include the LR receiving one or both of a RAT indicator or an expected type of service.

[0087] At 406, the method may include the LR determining whether a RAT indicator was received.

[0088] At 408, if a RAT indicator was received, the method may include the LR waking up the main radio corresponding to the indicated RAT.

[0089] At 410, if a RAT indicator was not received, the method may include the LR determining whether the LR meets the expected service type (e.g., whether the LR can perform the expected type of service).

[0090] At 412, if the LR meets the expected type of service, the method may include the LR providing the service type in the current cell or perform cell reselection to provide the service.

[0091] At 414, if the LR does not meet the expected type of service, the LR wakes up the main radio of the corresponding RAT. This allows the main radio to perform the expected type of service.

[0092] Figure 5 illustrates an example 500 of performing cell reselection in accordance with aspects of the present disclosure.

[0093] At 502, the method may include the LR receiving a redistribution indication.

[0094] At 504, the method may include the LR reading low power SIBs and performing cell reselection.

[0095] Thus, in one or more implementations using the techniques discussed herein, the LR performs initial cell selection according to its supported RF capability, from the strongest cells in each frequency accordingly, the LR prioritize the cell selection from the lowest frequency that maximizes the coverage for LR, and this lowest frequency may be configured or preconfigured to the LR as stored frequency.

[0096] Additionally or alternatively, the LR performs cell reselection or wakes up the main radio to perform the cell reselection, e.g., intra-system intra frequency, intra-system inter frequency, inter-system inter frequency depending on the expected type of service.

[0097] Additionally or alternatively, if the LR could not provide such service related to high data rate then the LR wakes up the corresponding main radio supporting the supported service or RAT and the main radio performs the legacy cell reselection. However, if the LR could provide such service related to low data rate then the LR performs cell reselection, e.g., without waking up the main radio.

[0098] 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.

[0099] 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-specificintegrated 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.

[0100] 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.

[0101] 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.

[0102] 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. The UE 600 may be configured to support a means for receiving, from a NE, a first signaling indicating a synchronization signal; selecting, by a low power processor of the UE, a cell based at least in part on the synchronization signal, one or more RF capabilities of the UE, and one or more criteria; and tuning to a synchronization channel of the selected cell.

[0103] Additionally, the UE 600 may be configured to support any one or combination of, where the UE includes a main radio and a low power radio that includes the low power processor; where the selected cell corresponds to a RAT of multiple RATs, and further including selecting the cell and tune to the synchronization channel of the selected cell without waking a main radio of theUE that corresponds to the RAT; where selecting the cell based on the one or more criteria comprises selecting a strongest cell of multiple cells accessible to the UE; where selecting the cell based on the one or more criteria comprises selecting a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the UE; where selecting the cell based on the one or more criteria comprises selecting the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells; where the one or more capabilities of the UE include one or both of RATs supported by the UE or frequencies supported by the UE; further including: receiving, from the NE, a wake-up signal; and selecting the cell in response to the wake-up signal; where to select the cell is to select a cell containing a RAT indicated in the wake-up signal; further including: receiving, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and selecting a new cell based at least in part on the one or more criteria; where the one or more criteria include a RAT indicator for the selected cell, and further including waking up a main baseband processor of the UE that corresponds to the RAT indicator; where the one or more criteria include an expected type of service; further including performing, by the low power processor, the expected type of service in response to the low power processor being able to perform the expected type of service; where the one or more criteria include a redistribution indicator; further including: receiving, by the low power processor from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; waking up, in response to the low power processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allowing the main baseband processor to select a new cell.

[0104] Additionally, or alternatively, the UE 600 may support to receive, from a NE, a first signaling indicating a synchronization signal; select, by a low power processor of the at least one processor, a cell based at least in part on the synchronization signal, one or more RF capabilities of the UE, and one or more criteria; and tune to a synchronization channel of the selected cell.

[0105] Additionally, the UE 600 may be configured to support any one or combination of where the UE includes a main radio and a low power radio that includes the low power processor; where the selected cell corresponds to a RAT of multiple RATs, and the low power processor is configured to cause the UE to select the cell and tune to the synchronization channel of the selectedcell without waking a main radio of the UE that corresponds to the RAT; where to select the cell based on the one or more is to select a strongest cell of multiple cells accessible to the UE; where to select the cell based on the one or more is to select a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the UE; where to select the cell based on the one or more criteria is to select the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells; where the one or more capabilities of the UE include one or both of RATs supported by the UE or frequencies supported by the UE; where the at least one processor is configured to cause the UE to: receive, from the NE, a wake-up signal; and select the cell in response to the wake-up signal; where to select the cell is to select a cell containing a RAT indicated in the wake-up signal; where the low power processor is configured to cause the UE to: receive, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and select a new cell based at least in part on the one or more criteria; where the one or more criteria include a RAT indicator for the selected cell, and the at least one processor is configured to cause the low power processor to wake up a main baseband processor of the UE that corresponds to the RAT indicator; where the one or more criteria include an expected type of service; where the low power processor is configured to cause the UE to perform the expected type of service in response to the low power processor being able to perform the expected type of service; where the one or more criteria include a redistribution indicator; where the low power processor is configured to cause the UE to: receive, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; wake up, in response to the low power processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allow the main baseband processor to select a new cell.

[0106] 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.

[0107] 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 608may 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.

[0108] 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.

[0109] 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 amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (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.

[0110] 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).

[0111] 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).

[0112] 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 include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

[0113] 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.

[0114] 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, flashmemory, 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).

[0115] 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.

[0116] 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.

[0117] The processor 700 may support wireless communication in accordance with examples as disclosed herein. The processor 700 may be configured to or operable to, where the processor comprises a low power processor: receive, from a NE, a first signaling indicating a synchronization signal; select a cell based at least in part on the synchronization signal, one or more RF capabilitiesof a UE that includes the processor, and one or more criteria; and allow the UE to tune to a synchronization channel of the selected cell.

[0118] Additionally, the processor 700 may be configured to support any one or combination of where the UE includes a main radio and a low power radio that includes the low power processor; where the selected cell corresponds to a RAT of multiple RATs, and the controller is configured to cause the processor to select the cell and tune to the synchronization channel of the selected cell without waking a main radio of the UE and where the UE corresponds to the RAT ; where to select the cell based on the one or more criteria is to select a strongest cell of multiple cells accessible to the processor; where to select the cell based on the one or more criteria is to select a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the processor; where to select the cell based on the one or more criteria is to select the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells; where the one or more capabilities of the UE include one or both of RATs supported by the UE or frequencies supported by the UE; where the at least one controller is configured to cause the processor to: receive, from the NE, a wake-up signal; and select the cell in response to the wake-up signal; where to select the cell is to select a cell containing a RAT indicated in the wake-up signal; where the at least one controller is configured to cause the processor to: receive, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and select a new cell based at least in part on the one or more criteria; where the one or more criteria include a RAT indicator for the selected cell, and the at least one controller is configured to cause the processor to wake up a main baseband processor of the UE that corresponds to the RAT indicator; where the one or more criteria include an expected type of service; where the at least one controller is configured to cause the processor to perform the expected type of service in response to the processor being able to perform the expected type of service; where the one or more criteria include a redistribution indicator; where the at least one controller is configured to cause the processor to: receive, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; wake up, in response to the processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allow the main baseband processor to select a new cell.

[0119] Figure 8 illustrates an example of a 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.

[0120] 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.

[0121] 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.

[0122] 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 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.

[0123] 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 functionsdescribed 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 support a means for transmitting, to a UE, a first signaling indicating to the UE to perform cell reselection corresponding to one or more criteria; and receiving, from the UE, a second signaling indicating the UE has selected a new cell.

[0124] Additionally, the NE 800 may be configured to support any one or combination of where the one or more criteria include a RAT indicator for the new cell; where the one or more criteria include an expected type of service; where the one or more criteria include a redistribution indicator.

[0125] Additionally, or alternatively, the NE 800 may support to transmit, to a UE, a first signaling indicating to the UE to perform cell reselection corresponding to one or more criteria; receive, from the UE, a second signaling indicating the UE has selected a new cell.

[0126] Additionally, the NE 800 may be configured to support any one or combination of where the one or more criteria include a RAT indicator for the new cell; where the one or more criteria include an expected type of service; where the one or more criteria include a redistribution indicator.

[0127] 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.

[0128] 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.

[0129] 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 mayinclude 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.

[0130] 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 amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (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.

[0131] Figure 9 illustrates a flowchart of a method 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.

[0132] At 902, the method may include receiving, from a NE, a first signaling indicating a synchronization signal. The operations of 902 may be performed 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.

[0133] At 904, the method may include selecting, by a low power processor of the UE, a cell based at least in part on the synchronization signal, one or more RF capabilities of the UE, and one or more criteria. 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.

[0134] At 906, the method may include tuning to a synchronization channel of the selected cell. The operations of 906 may be performed in accordance with examples as described herein. In someimplementations, aspects of the operations of 906 may be performed a UE as described with reference to Figure 6.

[0135] 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.

[0136] Figure 10 illustrates a flowchart of a method in accordance with aspects of the present disclosure. The operations of the method may be implemented by a 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.

[0137] At 1002, the method may include transmitting, to a UE, a first signaling indicating to the UE to perform cell reselection corresponding to one or more criteria. 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 a NE as described with reference to Figure 8.

[0138] At 1004, the method may include receiving, from the UE, a second signaling indicating the UE has selected a new cell. 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 a NE as described with reference to Figure 8.

[0139] 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.

[0140] 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 user equipment (UE) 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 UE to: receive, from a network entity (NE), a first signaling indicating a synchronization signal; select, by a low power processor of the at least one processor, a cell based at least in part on the synchronization signal, one or more radio frequency (RF) capabilities of the UE, and one or more criteria; and tune to a synchronization channel of the selected cell.

2. The UE of claim 1 , wherein the UE includes a main radio and a low power radio that includes the low power processor.

3. The UE of claim 1, wherein the selected cell corresponds to a radio access technology (RAT) of multiple RATs, and the low power processor is configured to cause the UE to select the cell and tune to the synchronization channel of the selected cell without waking a main radio of the UE that corresponds to the RAT.

4. The UE of claim 1 , wherein to select the cell based on the one or more criteria is to select a strongest cell of multiple cells accessible to the UE.

5. The UE of claim 1, wherein to select the cell based on the one or more criteria is to select a strongest cell of multiple cells in a lowest frequency of multiple frequencies accessible to the UE.

6. The UE of claim 1 , wherein to select the cell based on the one or more criteria is to select the cell based at least in part on information stored at the UE that includes at least one of previously received measurements or previously detected cells.

7. The UE of claim 1, wherein the one or more capabilities of the UE include one or both of radio access technologies (RATs) supported by the UE or frequencies supported by the UE.

8. The UE of claim 1, wherein the at least one processor is configured to cause the UE to: receive, from the NE, a wake-up signal; and select the cell in response to the wake-up signal.

9. The UE of claim 8, wherein to select the cell is to select a cell containing a radio access technology (RAT) indicated in the wake-up signal.

10. The UE of claim 1, wherein the low power processor is configured to cause the UE to: receive, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria; and select a new cell based at least in part on the one or more criteria.

11. The UE of claim 10, wherein the one or more criteria include a radio access technology (RAT) indicator for the selected cell, and the at least one processor is configured to cause the low power processor to wake up a main baseband processor of the UE that corresponds to the RAT indicator.

12. The UE of claim 10, wherein the one or more criteria include an expected type of service.

13. The UE of claim 12, wherein the low power processor is configured to cause the UE to perform the expected type of service in response to the low power processor being able to perform the expected type of service.

14. The UE of claim 10, wherein the one or more criteria include a redistribution indicator.

15. The UE of claim 1, wherein the low power processor is configured to cause the UE to: receive, from the NE, a second signaling indicating to perform cell reselection corresponding to one or more criteria that include an expected type of service; wake up, in response to the low power processor not being able to perform the expected type of service, a main baseband processor of the UE that is able to perform the expected type of service; and allow the main baseband processor to select a new cell.

16. 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, to a user equipment (UE), a first signaling indicating to the UE to perform cell reselection corresponding to one or more criteria; receive, from the UE, a second signaling indicating the UE has selected a new cell.

17. A processor for wireless communication, comprising: at least one controller coupled with at least one memory, wherein the processor comprises a low power processor and the at least one controller is configured to cause the processor to: receive, from a network entity (NE), a first signaling indicating a synchronization signal; select a cell based at least in part on the synchronization signal, one or more radio frequency (RF) capabilities of a user equipment (UE) that includes the processor, and one or more criteria; and allow the UE to tune to a synchronization channel of the selected cell.

18. The processor of claim 17, wherein the UE includes a main radio and a low power radio that includes the low power processor.

19. The processor of claim 17, wherein the selected cell corresponds to a radio access technology (RAT) of multiple RATs, and the controller is configured to cause the processor to select the cell and tune to the synchronization channel of the selected cell without waking a main radio of the UE and wherein the UE corresponds to the RAT.

20. A method performed by a user equipment (UE), the method comprising: receiving, from a network entity (NE), a first signaling indicating a synchronization signal; selecting, by a low power processor of the UE, a cell based at least in part on the synchronization signal, one or more radio frequency (RF) capabilities of the UE, and one or more criteria; and tuning to a synchronization channel of the selected cell.

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