Power optimization for smartwatch

Abstract

Systems and methods for improving power usage of a wireless device are disclosed. The wireless device includes: a memory; and, at least one processor communicatively coupled with the memory, the at least one processor configured to: determine a change in ambient light received by the wireless device; determining a location of the wireless device; activating a low power image sensor based on at least one of the ambient light change or the location of the wireless device; detecting a face using a low power image sensor; and turning on a display of the wireless device based on the user face being the detected face.

Description

Technical Field

[0001] Aspects of the present disclosure generally relate to improved power usage of wireless devices such as smart watches and smart bracelets. Background Art

[0002] Smart watches and smart bracelets are popular among various users for various applications. Smart watches and smart bracelets can be used to track the user's various exercise amounts, listen to music, detect heart rate, answer calls, etc. However, smart watches and smart bracelets must use power efficiently to improve battery life between charges. One feature that improves power efficiency or improves power usage is a "tilt-to-wake" (TTW) method that turns on the display and features of the smart watch when the user tilts the smart watch. However, the TTW method may waste battery power due to false alarms when the smart watch turns on the display and features unnecessarily. For example, the TTW method can reduce battery life by 20%-30% in one battery charging cycle.

[0003] Therefore, for battery-powered smart watches, smart bracelets and other wireless devices, more efficient power usage methods are needed. Summary of the invention

[0004] A brief summary of one or more aspects disclosed herein is presented below. Therefore, the following summary should not be considered a broad overview of all expected aspects, nor should it be considered to identify key or important elements related to all expected aspects or to delineate the scope associated with any particular aspect. Therefore, the sole purpose of the following summary is to present certain concepts related to one or more aspects related to the mechanisms disclosed herein in a simplified form prior to the detailed description presented below.

[0005] In one aspect, a method for improving power usage of a wireless device includes: determining a change in ambient light received by a light sensor of the wireless device; determining a location of the wireless device using a motion sensor; activating a low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; detecting a face using the low-power image sensor; and, based on an authorized user's face being the detected face, turning on a display of the wireless device.

[0006] In one aspect, a wireless device includes: a light sensor; a low-power image sensor; a motion sensor; and, at least one processor, the at least one processor is communicatively coupled to a memory, the light sensor, the motion sensor, and the low-power sensor, the at least one processor configured to: determine a change in ambient light received by the light sensor of the wireless device; determine a location of the wireless device using the motion sensor; activate the low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; detect a face using the low-power image sensor; and, based on an authorized user's face being the detected face, turn on a display of the wireless device.

[0007] In one aspect, a wireless device includes: means for determining a change in ambient light received by the wireless device; means for determining a location of the wireless device; means for activating a low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; means for detecting a face using the low-power image sensor; and means for turning on a display of the wireless device based on an authorized user's face being the detected face.

[0008] In one aspect, a non-transitory computer-readable medium is configured to store computer-executable instructions that, when executed by a processor, cause the processor to: determine a change in ambient light received by a light sensor of a wireless device; determine a location of the wireless device using a motion sensor; based on at least one of the change in ambient light or the location of the wireless device, activate a low-power image sensor; detect a face using the low-power image sensor; and, based on an authorized user's face being the detected face, turn on a display of the wireless device.

[0009] Other objects and advantages associated with the various aspects disclosed herein will become apparent to those skilled in the art based on the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are presented to aid in describing various aspects thereof.

[0011] Figure 1 An example wireless communication system is illustrated in accordance with aspects of the present disclosure.

[0012] Figure 2 An exemplary wireless device in accordance with aspects of the present disclosure is illustrated.

[0013] Figure 3 Flowcharts corresponding to one or more methods for improving power usage of wireless devices are illustrated in accordance with aspects of the present disclosure.

[0014] Figure 4A Exemplary implementations of wireless devices according to aspects of the present disclosure are illustrated.

[0015] Figure 4B Various exemplary face detections are illustrated.

[0016] Figure 5 A flow chart corresponding to a portion of one or more methods for improving power usage of a wireless device in accordance with aspects of the present disclosure is illustrated. DETAILED DESCRIPTION

[0017] Various aspects of the present disclosure are provided below in the description of each example provided for illustrative purposes and in the related drawings. Alternative aspects can be imagined without departing from the scope of the present disclosure. In addition, the known elements of the present disclosure will not be described in detail or will be omitted to avoid confusing the relevant details of the present disclosure.

[0018] The words "exemplary" and / or "example" are used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" and / or "example" is not necessarily to be construed as preferred or advantageous over other aspects. Likewise, the term "aspects of the disclosure" does not require that all aspects of the disclosure include the discussed feature, advantage, or mode of operation.

[0019] Those skilled in the art should understand that the information and signals described below may be represented using any of a variety of different techniques and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned in the following description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof, which depends in part on the specific application, in part on the desired design, in part on the corresponding technology, etc.

[0020] Further, many aspects are described in terms of an order of actions performed, for example, by elements of a computing device. It should be appreciated that the various actions described herein may be performed by specific circuits (e.g., an application specific integrated circuit (ASIC)), or may be performed by program instructions executed by one or more processors, or may be performed by a combination of the two. In addition, the order of actions described herein may be viewed as being fully embodied in any form of non-transitory computer-readable storage medium storing a set of corresponding computer instructions that, when executed, cause or direct the associated processor of the device to perform the functions described herein. Thus, various aspects of the present disclosure may be embodied in a variety of different forms, all of which are considered to be within the scope of the claimed subject matter. In addition, for each aspect described herein, the corresponding form of any of these aspects may be described herein as, for example, "logic" that is "configured to" perform the described actions.

[0021] The terms "user equipment" (UE) and "base station" as used herein are not intended to be specific to or limited to any particular radio access technology (RAT), unless otherwise specified. Generally, a UE can be any wireless communication device (e.g., a mobile phone, a router, a tablet computer, a laptop computer, a consumer asset tracking device, a wearable device (e.g., a smart watch, glasses, augmented reality (AR) / virtual reality (VR) headsets, etc.), a vehicle (e.g., a car, a motorcycle, a bicycle, etc.), an Internet of Things (IoT) device, etc.) used by a user to communicate over a wireless communication network. The UE can be mobile or can be fixed (e.g., at certain times) and can communicate with a radio access network (RAN). The term "UE" as used herein can be interchangeably referred to as an "access terminal" or "AT", "client device", "wireless device", "subscriber device", "subscriber terminal", "subscriber station", "user terminal" or "UT", "mobile device", "mobile terminal", "mobile station" or variations thereof. Generally, a UE can communicate with a core network via a RAN, and the UE can be connected to external networks such as the Internet and other UEs through the core network. Of course, other mechanisms are also possible for the UE to connect to the core network and / or the Internet, such as through a wired access network, a wireless local area network (WLAN) network (e.g., based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specification, etc.), etc.

[0022] Depending on the network in which the base station is deployed, the base station may operate according to one of several RATs communicating with the UE, and may be alternatively referred to as an access point (AP), a network node, a Node B, an evolved Node B (eNB), a next generation eNB (ng-eNB), a new radio (NR) Node B (also referred to as a gNB or gNodeB), etc. The base station may be primarily used to support wireless access for the UE, including supporting data, voice and / or signaling connections for the supported UE. In some systems, the base station may only provide edge node signaling functions; while in other systems, the base station may provide additional control and / or network management functions. The communication link through which the UE may send a signal to the base station is called an uplink (UL) channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc.). The communication link through which the base station may send a signal to the UE is called a downlink (DL) or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.). The term traffic channel (TCH) as used herein may refer to an uplink / reverse or downlink / forward traffic channel.

[0023] The term "base station" may refer to a single physical transmit receive point (TRP) or multiple physical TRPs that may be co-located or non-co-located. For example, where the term "base station" refers to a single physical TRP, the physical TRP may be an antenna of the base station corresponding to a cell (or several cell sectors) of the base station. Where the term "base station" refers to multiple co-located physical TRPs, the physical TRP may be an antenna array of the base station (e.g., as in a multiple-input multiple-output (MIMO) system or where the base station employs beamforming). Where the term "base station" refers to multiple non-co-located physical TRPs, the physical TRP may be a distributed antenna system (DAS) (a network of spatially separated antennas connected to a common source via a transmission medium) or a remote radio head (RRH) (a remote base station connected to a serving base station). Alternatively, the non-co-located physical TRP may be a serving base station that receives measurement reports from a UE and an adjacent base station where the UE is measuring a reference RF signal. Because the TRP is the point at which a base station transmits and receives wireless signals, references to transmissions from a base station or receptions at a base station as used herein should be understood as reference to a specific TRP of a base station.

[0024] In some embodiments of supporting UE positioning, the base station may not support wireless access of the UE (e.g., may not support data, voice and / or signaling connections of the UE), but may send a reference signal to the UE for measurement by the UE, and / or may receive and measure a signal sent by the UE. Such a base station may be referred to as a positioning beacon (e.g., when sending a signal to the UE) and / or a position measurement unit (e.g., when receiving and measuring a signal from the UE).

[0025] An "RF signal" comprises an electromagnetic wave of a given frequency that transmits information through the space between a transmitter and a receiver. A transmitter as used herein may transmit a single "RF signal" or multiple "RF signals" to a receiver. However, due to the propagation characteristics of RF signals through multipath channels, a receiver may receive multiple "RF" signals corresponding to each RF signal transmitted. The same transmitted RF signal on different paths between a transmitter and a receiver may be referred to as a "multipath" RF signal.

[0026] Figure 1An exemplary wireless communication system 100 is illustrated. The wireless communication system 100 (which may also be referred to as a wireless wide area network (WWAN)) may include various base stations 102 and various UEs 104. The base stations 102 may include macro cell base stations (high power cellular base stations) and / or small cell base stations (low power cellular base stations). In one aspect, the macro cell base station may include an eNB and / or ng-eNB in ​​which the wireless communication system 100 corresponds to an LTE network, or a gNB in ​​which the wireless communication system 100 corresponds to an NR network, or a combination of both, and the small cell base station may include a femto cell, a pico cell, a micro cell, etc.

[0027] The base stations 102 may collectively form a RAN and be connected to a core network 170 (e.g., an evolved packet core (EPC) or a 5G core (5GC)) via backhaul links 122 and to one or more location servers 172 (which may be part of the core network 170 or may be located outside the core network 170) via the core network 170. The base stations 102 may communicate with each other directly or indirectly (e.g., via EPC / 5GC) via backhaul links 134 (which may be wireless or wired).

[0028] Base station 102 may communicate wirelessly with UE 104. Each of base stations 102 may provide communication coverage for a respective geographic coverage area 110. In one aspect, one or more cells may be supported by base station 102 in each geographic coverage area 110. A "cell" is a logical communication entity used to communicate with a base station (e.g., via certain frequency resources, also referred to as carrier frequencies, component carriers, carriers, frequency bands, etc.), and may be associated with an identifier (e.g., physical cell identifier (PCI), virtual cell identifier (VCI), cell global identifier (CGI)) used to distinguish cells operating via the same or different carrier frequencies. In some cases, different cells may be configured according to different protocol types that may provide access to different types of UEs (e.g., machine type communication (MTC), narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB), etc.). Because a cell is supported by a specific base station, the term "cell" may refer to one or both of a logical communication entity and a base station supporting it, depending on the context. In some cases, the term "cell" may also refer to a geographic coverage area (eg, a sector) of a base station, as long as a carrier frequency can be detected and used for communications within some portion of the geographic coverage area 110.

[0029] Although the geographic coverage areas 110 of adjacent macrocell base stations 102 may partially overlap (e.g., within a handoff region), some geographic coverage areas 110 may be substantially overlapped by a larger geographic coverage area 110. For example, a small cell (SC) base station 102' may have a geographic coverage cell 110' that substantially overlaps with the geographic coverage area 110 of one or more macrocell base stations 102. A network including small cell and macrocell base stations may be referred to as a heterogeneous network. A heterogeneous network may also include a home eNB (HeNB) that may provide service to a restricted group called a closed subscriber group (CSG).

[0030] The communication link 120 between the base station 102 and the UE 104 may include an uplink (also referred to as a reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (also referred to as a forward link) transmission from the base station 102 to the UE 104. The communication link 120 may use MIMO antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication link 120 may be over one or more carrier frequencies. The allocation of carriers may be asymmetric with respect to the uplink and downlink (e.g., more or fewer carriers may be allocated for the downlink than for the uplink).

[0031] The wireless communication system 100 may also include a wireless local area network (WLAN) access point (AP) 150 that communicates with a WLAN station (STA) in an unlicensed spectrum (e.g., 5 GHz) via a communication link 154. When communicating in the unlicensed spectrum, the WLAN STA 152 and / or the WLAN AP 150 may perform a clear channel assessment (CCA) or a listen before talk (LBT) process to determine whether a channel is available prior to communication.

[0032] The small cell base station 102' can operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell base station 102' can adopt LTE or NR technology and use the same 5GHz unlicensed spectrum used by the WLAN AP 150. The small cell base station 102' adopting LTE / 5G in the unlicensed spectrum can expand the coverage to the access network and / or increase the capacity of the access network. NR in the unlicensed spectrum can be referred to as NR-U. LTE in the unlicensed spectrum can be referred to as LTE-U, License Assisted Access (LAA) or MulteFire.

[0033] The wireless communication system 100 may also include a millimeter wave (mmW) base station 180, which may operate at mmW frequencies and / or near mmW frequencies to communicate with the UE 182. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. The EHF range is 30 GHz to 300 GHz, and the wavelength is between 1 mm and 10 mm. Radio waves in this frequency band may be referred to as millimeter waves. Near mmW may extend down to a 3 GHz frequency with a wavelength of 100 mm.

[0034] The wireless communication system 100 may also include a UE 164, which may communicate with the macrocell base station 102 via a communication link 120 and / or communicate with the mmW base station 180 via a mmW communication link 184. For example, the macrocell base station 102 may support a PCell and one or more Scells for the UE 164, and the mmW base station 180 may support one or more Scells for the UE 164.

[0035] exist Figure 1 In the example of FIG. 1 , one or more Earth-orbiting satellite positioning system (SPS) spacecraft (SV) 112 (eg, satellites) may be used as any of the illustrated UEs (for simplicity, in FIG. 1 ). Figure 1 104 may include one or more dedicated SPS receivers specifically designed to receive SPS signals 124 to derive geographic location information from SV 112. SPS typically includes a transmitter (e.g., SV 112) system positioned to enable a receiver (e.g., UE 104) to determine its position on or above the earth based at least in part on a signal (e.g., SPS signal 124) received from the transmitter. As used herein, SPS may include any combination of one or more global and / or regional navigation satellite systems and / or augmentation systems, and SPS signals 124 may include SPS, SPS-like, and / or other signals associated with the one or more SPSs.

[0036] The wireless communication system 100 may also include one or more UEs, such as UE 190, which are indirectly connected to one or more communication networks via one or more device-to-device (D2D) point-to-point (P2P) links (referred to as “side links”). Figure 1In the example of FIG. 1 , UE 190 has a D2D P2P link 192 with one of UEs 104 connected to one of base stations 102 (through which UE 190 can indirectly obtain a cellular connection), and a D2D P2P link 194 with a WLAN STA 152 connected to a WLAN AP 150 (through which UE 190 can indirectly obtain a WLAN-based Internet connection). In one example, D2D P2P links 192 and 194 can be supported by any well-known D2D RAT, such as LTE Direct (LTE-D), WiFi Direct (WiFi-D), wait.

[0037] As used herein, the terms smartwatch and smartband can be used interchangeably, and the use of one term does not exclude the other term. In some aspects, a smartwatch or smartband may include one or more aspects of the various UEs described above, such as the ability to communicate directly with various base stations through a cellular network using various technologies (e.g., LTE, 5G, etc.), the ability to communicate through a WLAN network, the ability to communicate directly with another UE, etc. Therefore, according to the various aspects disclosed herein, the UE described above can be implemented in various forms, including but not limited to smartwatches, smartbands, smart phones, tablet computers, and other devices that can perform the aforementioned functions. Therefore, it should be understood that the above description is merely an example and should not be interpreted as limiting the various aspects disclosed herein.

[0038] Figure 2 A simplified schematic diagram of an exemplary wireless device 200 having a processor 220, an antenna array 210, a transceiver 222, a camera sensor system 230, and a display 234 is illustrated. The wireless device 200 also includes a memory 240. The camera sensor system 230 includes a camera 232, a light sensor 233, a low-power image sensor 235, and a motion sensor, such as an inertial measurement unit (IMU) 236. In some aspects, the low-power image sensor 235 can consume less than 10 milliwatts (mw) of power, as opposed to the hundreds of milliwatts consumed by traditional cameras in wireless devices (such as camera 232). In some aspects, the low-power image sensor 235 can be a Glance sensor. In one aspect, the motion sensor (e.g., IMU 236) can include an accelerometer, a gyroscope, a magnetometer, and / or other sensors that can be used to measure and detect the movement of the wireless device 200. In the following description, IMU may be used to describe various aspects and functions of motion detection, but it should be understood that the aspects are not limited to IMU, but may include any device that can perform the functions disclosed and claimed herein. It should be understood that the wireless device 200 may be similar to Figure 1The UE 104, 190 or any other UE shown, and may also include one or more additional components to provide various functions of the UE described herein (e.g., a separate SPS receiver, an additional processor, an additional wireless transceiver, etc.), which are Figure 2 It is not shown explicitly to avoid unnecessary complexity.

[0039] The wireless device 200 may be any suitable electronic device capable of wireless communication, and in some aspects may be a mobile device. For example, in some aspects, the wireless device 200 may be a smart watch, a smart bracelet, a smart phone, a tablet computer, a laptop computer, a cargo tracking device, a wearable device, smart glasses, a vehicle-mounted computer installed in a vehicle, etc. In various aspects, the wireless device 200 may be a smart watch or a smart bracelet that can be worn on the wrist of the user of the wireless device 200, such as Figure 4A shown.

[0040] In some aspects, the antenna array 210 includes multiple antennas for transmit and receive beamforming. The antenna array 210 is coupled to a transceiver 222. The processor 220 can control the antenna array 210 and the transceiver 222. The transceiver 222 may include a wireless wide area network (WWAN) transceiver to provide for communication via one or more wireless communication networks (e.g., see Figure 1 ) (such as NR network, LTE network and / or GSM network, etc.) for communicating (e.g., means for sending, means for receiving, means for measuring, means for tuning, means for refraining from sending, etc.). The WWAN transceiver can be connected to one or more antennas in the antenna array 210 to communicate with other network nodes (such as other UEs, access points, base stations (e.g., eNBs, gNBs), etc.) via at least one designated radio access technology (RAT) (e.g., NR, LTE, GSM, etc.) through a wireless communication medium of interest (e.g., a certain set of time / frequency resources in a specific spectrum). In some aspects, the transceiver 222 may also include a wireless local area network (WLAN) transceiver. The WLAN transceiver can be connected to one or more antennas in the antenna array 210 and provide for communicating via at least one designated RAT (e.g., WiFi, LTE-D, A component (e.g., a component for sending, a component for receiving, a component for measuring, a component for tuning, a component for refraining from sending, etc.) for communicating with other network nodes (such as other UEs, access points, base stations, etc.) through a wireless communication medium of interest.

[0041] In addition, in some aspects, the transceiver 222 may include a satellite positioning system (SPS) receiver. The SPS receiver may be connected to one or more antennas in the antenna array 210, respectively, and may provide components for receiving and / or measuring SPS signals (such as global positioning system (GPS) signals, global navigation satellite system (GLONASS) signals, Galileo signals, Beidou signals, Indian regional navigation satellite system (NAVIC), Quasi-Zenith Satellite System (QZSS), etc.). The SPS receiver may include any suitable hardware and / or software for receiving and processing SPS signals. Although it is discussed above that the transceiver includes various aspects of a variety of wireless communication technologies, it should be understood that in some aspects, one or more wireless communication technologies may be used, and the various aspects are not limited to any specific combination of wireless communication technologies.

[0042] The transceiver circuitry in the transceiver 222, including at least one transmitter and at least one receiver, may comprise an integrated device (e.g., transmitter circuitry and receiver circuitry embodied as a single communication device) in some embodiments, or may comprise separate transmitter devices and separate receiver devices in some embodiments, or may be embodied in other ways in other embodiments. In one aspect, the transmitter may include or be coupled to multiple antennas that allow the corresponding device to perform transmit "beamforming", such as antenna array 210, as described herein. Similarly, the receiver may include or be coupled to multiple antennas that allow the corresponding device to perform receive "beamforming", such as antenna array 210, as described herein. In one aspect, the transmitter and receiver may share the same multiple antennas (e.g., antenna array 210) so that the corresponding device can only receive or transmit at a given time, but not simultaneously.

[0043] like Figure 2 As shown, the processor 220 is coupled to the transceiver 220. The processor 200 is also coupled to the memory 240 and the camera sensor system 230, as shown in FIG. Figure 2 2. The camera sensor system 230 includes a camera 232, a light sensor 233, a low power image sensor 235, and an inertial measurement unit (IMU) 236, as described above. The camera sensor system 230 detects and measures its corresponding environment and sends the measurement data to the processor 220. The IMU 236 can measure the movement of the wireless device 200, including movement and rotational movement in a three-dimensional coordinate system. In one aspect, the processor 220 can control the operation of the camera sensor system 230. In addition, the processor 220 is coupled to the display 234 and can control the operation of the display 234, including when to turn on the display 234 and when to turn off the display 234.

[0044] In one aspect, the processor 220 may control the camera 232, the light sensor 233, the low power image sensor 235, and the IMU 236 in the camera sensor system 230, and receive data from the camera 232, the light sensor 233, the low power image sensor 235, and the IMU 236. The IMU 236 may measure the movement and orientation of the wireless device 200, including rotational movement and movement in a three-dimensional coordinate system (e.g., a Cartesian coordinate system (x, y, z), a spherical coordinate system, etc.). The IMU 236 may also measure the movement speed of the wireless device 200. The IMU 236 may send the measured movement and orientation data to the processor 220. The light sensor 233 may measure the ambient light around the wireless device 200, and send the measured ambient light data to the processor 220 as directed by the processor 200.

[0045] In one aspect, low-power image sensor 235 may include an image sensor and a low-power processor running a computer vision algorithm. In certain aspects, low-power image sensor 235 may identify when a person is facing display 234, and may identify the angle and orientation of the person's face when facing display 234. Low-power image sensor 235 may send data about whether a person is facing display 234 and the angle and orientation of the person's face when facing display 234 (such as upside down or right side up or other orientation data).

[0046] In various aspects, the wireless device 200 may be a smart watch or smart bracelet that can be worn on the wrist of the user of the wireless device 200, such as Figure 4A shown. Figure 4A The example diagram in shows a user 405 wearing the wireless device 200 on the user's wrist. As used herein, the term "user" generally refers to the wearer (e.g., smart watch, smart bracelet) or holder of the wireless device, and does not necessarily mean that the user has permission to use the wireless device. The low-power image sensor 235 does not typically perform specific facial recognition of a given person, but is typically able to detect facial features and orientation to enable recognition of a face facing the wireless device, which can be inferred as a person wearing or holding the wireless device based on the specific orientation. As described above, the processor 220 instructs the light sensor 233 to detect ambient light around the wireless device 200. For example, in some aspects, when the user 405 moves the wireless device 200 by moving the user's arm, the amount of light received by the light sensor 233 can change and fluctuate. In some aspects, the amount of light received by the light sensor 233 when the wireless device 200 is close to the user's 205 waist can be different from the amount of light received when the user 405 moves the wireless device 200 to the chest to view the display 234, such as Figure 4AAs shown. In some aspects, the processor 220 may receive ambient light data from the light sensor 233 at certain time intervals. In some aspects, the time interval may be predetermined; while in other aspects, the processor 200 may change the time interval. As described below, the processor 220 may calculate the difference or change in the ambient light received at different time intervals. If the difference or change in the received ambient light exceeds a certain threshold, the wireless device 200 may take one or more actions, as described below. According to the range, the general ambient light conditions may be considered as low light, indoors and outdoors (see Table 1 below). Within each of these ranges, it is assumed that there will be a change in ambient light conditions that exceeds the change threshold. For example, when a user moves the user's arm from a non-visible position of the wireless device to a visible position (e.g., from the user's arm and smart watch being located on the side of the user and facing the side to the smart watch moving to the chest level and generally oriented to face up and toward the user's face), a change in ambient light conditions may occur. The change thresholds for various ambient conditions may be set to a constant (e.g., greater than 15% of the previous average lux value) as a specific lux value for each range, or may vary according to the ambient conditions. In some aspects, the change threshold can be based on ambient light that is classified as one of low light, indoors, or outdoors. For example, the change threshold for outdoor conditions can be greater than the change threshold for indoor conditions because the ambient light values ​​in outdoor environments may vary more (e.g., see Table 1 values). However, it should be understood that these values ​​are merely representative, and the various aspects disclosed are not limited to these specific values ​​or ranges. Further, additional criteria (such as time of day, weather conditions, user posture, etc.) can be used to adjust the threshold.

[0047] condition Average Lux Value Change threshold Low light >=5 to <=300 >15％ indoor >=700 to <=3000 >30％ outdoor >=7500 to <=65000 >50％

[0048] Table 1

[0049] In addition, the processor 220 may use the data received from the IMU 236 to determine the location information of the wireless device 200, including at least one of the orientation, translation, and / or motion of the wireless device 200. The location information may include angles, rotations, and movements of the wireless device 200 on multiple axes processed by the processor 220 based on the data detected by the IMU 236. The processor 220 may use algorithms, such as rotation vector algorithms, to determine the location information of the wireless device 200. These algorithms may be stored in the memory 240 and processed by the processor 220. For example, the processor 220 may use a combination of data from the IMU 236 to calculate the location of the wireless device 200 in a two-dimensional (2D) and / or three-dimensional (3D) coordinate system.

[0050] Based on the data received from the IMU 236, the processor 220 can determine whether the wireless device 200 has moved; if so, determine the location of the wireless device 200. The processor 200 can determine the movement and location of the wireless device 200 at certain time intervals. In one aspect, the time intervals can be predetermined; while in other aspects, the processor 200 can change the time intervals. For example, the user 405 may initially have the wireless device 200 at the user's side, but later the user 405 may move the wireless device 200 to the user's chest area or region to view the display 234, such as Figure 4A In one aspect, the processor 220 can determine whether the wireless device 200 has moved to a position that allows the user 405 to view the display 234. It should be appreciated that a variety of positions can satisfy the aspect of the position that allows the user 405 to view the display 234, such as any time when the wireless device 200 is within a given area and / or orientation relative to the user 405. When the wireless device 200 has moved to such a position, the processor 220 can take further actions, as described below.

[0051] In one aspect, when the processor 220 determines that the change in ambient light received by the wireless device 200 has exceeded a certain threshold, the processor 220 can activate and instruct the low power image sensor 235 to detect that a face is facing the display 234. In another aspect, when the processor 220 determines that the movement and position of the wireless device 200 allows the user 405 to view the display 234 (such as moving the wireless device 200 to a chest position or turning the wrist so that the display 234 can be seen by the user), the processor 220 can instruct the low power image processor 235 to detect a face facing the display 234. In one aspect, the low power image sensor 235 can be placed behind or near the display 234 so that the orientation of the low power image sensor 235 is consistent with the display 234 in order to detect a face facing the display 234. The low power image sensor 235 can detect a face by parsing one or more images generated by an image sensor in the low power image sensor 235. For example, a face can be detected by determining a general shape and one or more features (such as eyes, nose, etc.). The orientation of the face can be detected by the relative position of the feature(s) and whether they are visible. For example, if only one eye is visible, it indicates that the user's head is turned away. The angle of the user's head can be determined based on the relative position of (multiple) features. Furthermore, it should be understood that the low-power image sensor 235 determines features that are not used for user facial recognition, but can be used to identify features to detect faces and orientations of faces. In another aspect, when two or more conditions are met, the processor can instruct the low-power image sensor 235 to detect a face facing the display 234. For example, the two or more conditions can include that the change in the received ambient light detected by the wireless device 200 has exceeded a change threshold, and the movement and position of the wireless device 200 indicate that the position of the wireless device 200 allows the user 405 to view the display 234. In some aspects, the position or area for which the processor can instruct the low-power image sensor 235 to detect a face facing the display 234 can vary based on the position or orientation of the user. For example, if it is detected that the user is leaning over, the processor can instruct the low-power image sensor 235 to detect a face facing the display 234 when the wireless device 200 is below chest level. It should be appreciated that many other orientations of the user and the wireless device may allow the user to view the display 234 , and that the various aspects disclosed herein are not limited to any particular orientation in which the low-power image sensor 235 may detect a face facing the display 234 as directed by the processor 220 .

[0052] Figure 4BDifferent types of exemplary facial orientations that may be detected by the low-power image sensor 235 are shown. Examples 414, 415, and 420 show faces detected by the low-power image sensor 235 upside down. This may occur when the low-power image sensor 235 detects a face from a person around the user 405 instead of the user 405. For example, when the wireless device 200 is inverted on the side of the user 405, the low-power image sensor 235 may detect the face of a person adjacent to the user 405 or opposite the user 405. In these cases, the face detected by the low-power image sensor 235 may be upside down, as shown in example faces 410, 415, and 420. However, if the user 405 is facing the low-power image sensor 235, the face detected by the low-power image sensor 235 may be upright, as shown in example faces 430 and 435. Although example face 425 shows an upright face, the tilt or angle of the face may exceed the facial tilt threshold. If the tilt or angle of the vertical face detected by the low-power image sensor 235 exceeds a certain threshold (i.e., a facial tilt threshold of negative 50 degrees to positive 50 degrees, where 0 degrees is the orientation of the vertical face 430), it is possible that the low-power image sensor 325 detects the face of a person adjacent to the user 405 instead of the user 405.

[0053] In one aspect, if the processor 220 determines that the face detected by the low-power image sensor 235 is not the face of the user 405 (such as the example faces 410, 415, 420, and 425), the processor 220 may not turn on the display 234 to reduce the power usage of the wireless device 200. However, if the processor 220 determines that the face detected by the low-power image sensor 235 is the face of the user 405 (such as the example faces 430 and 435), the processor 220 may turn on the display 234 so that the user 405 can view the content on the display 234. In some aspects, when the user's face is detected, the camera 232 may be activated to authenticate a specific user (i.e., an authorized user) who is authorized to use the wireless device, and / or other authentication methods (e.g., biometric user recognition, etc.) may be performed before turning on the display 234.

[0054] In summary, the processor 220 may not activate the low-power image sensor 235 to detect faces unless the change in ambient light exceeds a certain threshold and / or the movement and orientation of the wireless device 200 allows the user 405 to view the display 234. In addition, if the low-power image sensor 235 is activated to detect faces and detects a face that is unlikely to be the face of the user 405 (such as the example faces 410, 415, 420, and 425), the processor 220 may not turn on the display 234. However, if the low-power image sensor 235 is activated and detects a face that is likely to be the face of the user 450, the processor 220 may turn on the display 234 so that the user 405 can view the content on the display 234.

[0055] Figure 2 The components of can be implemented in various ways. In some embodiments, Figure 2 The components may be implemented in one or more circuits, such as one or more processors and / or one or more ASICs (which may include one or more processors). Here, each circuit may use and / or include at least one memory component for storing information or executable code used by the circuit to provide such functionality. For example, some or all of the functions represented by blocks 210 to 240 may be implemented by a processor and (multiple) memory components of the wireless device 200 (e.g., by executing appropriate code and / or by appropriate configuration of the processor components). However, it should be understood that these operations, actions and / or functions may actually be performed by specific components or combinations of components of the wireless device 200 (such as the antenna array 210, the transceiver 222, the processor 220, the camera sensor system 230, the display 234 and the memory 240). Therefore, it should be understood that the components and their arrangements and functions described herein are provided only as examples for explanation and should not be interpreted as limiting the various aspects disclosed herein to the specific details provided in the illustrated examples.

[0056] It should be understood that the disclosed aspects include various methods for performing the processes, functions and / or algorithms disclosed herein. For example, Figure 3 A method 300 for improving power usage of a wireless device is shown. The method may be performed by, for example, Figure 1 The invention is performed by the wireless device 200, the processor 220, the UEs 104 and 109 or other UEs shown.

[0057] At block 310, the method determines a change in ambient light received by a light sensor of the wireless device. The processor 220 may determine a change in ambient light received by the wireless device 200 based on data received from the light sensor 233. The processor 200 may check the change in ambient light at certain time intervals to see if the change exceeds a threshold.

[0058] At block 320, the method determines the location of the wireless device using the motion sensor. The processor 220 may determine the location and / or movement of the wireless device 200 based on the data detected and measured by the IMU 236. The processor 220 may determine whether the location of the wireless device 200 allows the user to view the display 234.

[0059] At block 330, the method activates the low power image sensor based on at least one of a change in ambient light or a position of the wireless device.The processor 220 may activate the low power image sensor 235 based on a change in ambient light and / or a position of the wireless device 200 to detect a face.

[0060] At block 340, the method detects a face using the low-power image sensor. The low-power image sensor 235 can detect a face. It should be appreciated that detecting a face includes identifying that the face may be the face of a user (e.g., wearer, holder) of the wireless device 200, rather than just detecting any face. For example, if the detected face is upright and tilted or deviated by no more than a threshold angle and / or other criteria, the processor 220 can turn on the display 234, as disclosed herein.

[0061] At block 350, the method turns on the display of the wireless device based on the authorized user face being the detected face. The processor 220 may turn on the display 234 based on the user face being the face detected by the low-power image sensor 235. As described above, the detection of the user face is limited to the face that may be the user of the wireless device 200 based on, for example, the orientation of the wireless device, the tilt of the face, and / or other aspects discussed herein.

[0062] In view of the above, it should be understood that other aspects may include additional methods for determining when to activate the display using the low-power image sensor 235 and the various techniques disclosed herein. For example, hand movement and position may be determined by training, absolute values, and the like. For example, a user may calibrate the detection of hand movement, such as from the side to the chest, to the head, and the like. In some aspects, the calibration process may include starting with the wrist under the user's hips, then moving the wrist up to near the user's chest, and repeating the movement to obtain a moving average and calculating the distance between the hip level and the chest level. Further, by starting with the wrist under the user's hips, then moving the wrist up to above the head and repeating the movement to obtain a moving average, the movement between the hip level and the level above the head is determined, and the distance between the hip level and the level above the head is calculated. These values ​​may be used to determine when to turn on the low-power image sensor 235, as described below.

[0063] Reference Figure 5, a flowchart 500 corresponding to a portion of one or more methods for improving power usage of a wireless device according to aspects of the present disclosure is provided. Specifically, in some aspects, aspects of determining the position of the wireless device (e.g., 320 described above) may include one or more processes, such as provided in flowchart 500. For example, at block 510, an accelerometer in the wireless device may be monitored to detect motion. At block 520, based on monitoring the accelerometer, the device may detect motion from the hip to the chest. The detection may be based on the results of the calibration routine described above, or may be based on pre-established movement values ​​(e.g., pre-programmed in the wireless device based on samples from various users, etc.). If no movement from the hip to the chest is detected, the display is kept off at block 540, and this portion of the flowchart ends. If movement is detected, in some aspects, the display may be turned on after the movement detection. In other aspects, optionally, at block 530, a continuous movement toward the head to above the head level may be detected. If the continuous movement is detected, the display 234 is kept off at block 540, and this portion of the flowchart ends. It should be appreciated that in some aspects, in order to facilitate detection of sustained movement and avoid false triggering, a delay (e.g., approximately 50 milliseconds) may be included before determining whether there is sustained movement above the user's head. However, at block 530, if no sustained movement is detected, in some aspects, this portion of the flowchart returns to block 330 (described above) and the face detection process may be initiated.

[0064] Various additional or alternative processes may be used to determine when to activate the low power image sensor 235 for face detection and / or turn on the display 234. For example, tilting of the device may be included as part of the movement detection from hip level to chest level, as previously described. Furthermore, changes in ambient light may be further combined with one or more movement detections discussed herein. Therefore, in view of the foregoing, it should be appreciated that the disclosed aspects are not limited to the explicit examples and combinations expressly discussed.

[0065] In the detailed description above, it can be seen that different features are combined together in the examples. This disclosure should not be interpreted as an example clause having more features than those explicitly mentioned in each clause. On the contrary, various aspects of the present disclosure may include fewer features than all the features of the disclosed single example clause. Therefore, the following clauses should be considered to be included in the description, where each clause itself can be used as a separate example. Although each dependent clause can be referenced in the clause in a specific combination with one of the other clauses, the aspects of the dependent clause are not limited to the specific combination. It should be understood that other example clauses may also include a combination of aspects of the dependent clause with the subject matter of any other dependent clause or independent clause or any feature with other dependent and independent clauses. The various aspects disclosed herein explicitly include these combinations, unless it is explicitly stated or can be easily inferred that a specific combination is not intended (for example, contradictory aspects, such as defining an element as an electrical insulator and an electrical conductor). In addition, this also means that various aspects of a clause can be included in any other independent clause, even if the clause is not directly dependent on the independent clause.

[0066] Implementation examples are described in the following numbered clauses.

[0067] Item 1. A method performed by a wireless device, the method comprising: determining a change in ambient light received by a light sensor of the wireless device; determining a location of the wireless device using a motion sensor; activating a low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; detecting a face using the low-power image sensor; and, based on an authorized user's face being the detected face, turning on a display of the wireless device.

[0068] Clause 2. The method of clause 1, further comprising: determining whether a change in ambient light exceeds a change threshold.

[0069] Clause 3. The method of clause 2, wherein the change threshold is based on ambient light classified as one of low light, indoors, or outdoors.

[0070] Clause 4. The method of any one of clauses 2 to 3, further comprising: determining whether the location of the wireless device allows a user of the wireless device to view the display.

[0071] Clause 5. The method of clause 4, wherein the low power image sensor is activated when a change in ambient light exceeds a change threshold and the position of the wireless device allows the user to view the display.

[0072] Clause 6. The method of any one of clauses 4 to 5, wherein the position of the wireless device allows the user to view the display when the wireless device is at chest level of the user.

[0073] Clause 7. The method of any of clauses 4 to 6, wherein the position of the wireless device that allows the user to view the display depends on the orientation of the user.

[0074] Clause 8. The method of any one of clauses 1 to 7, wherein detecting a face further comprises detecting the authorized user's face when the face is upright at an inclination less than a facial inclination threshold.

[0075] Clause 9. The method of clause 8, wherein the facial tilt threshold is negative 50 degrees to positive 50 degrees.

[0076] Clause 10. A method according to any one of clauses 8 to 9, wherein detecting a face further comprises: determining that the face is inverted or has a tilt greater than a facial tilt threshold; and determining that an authorized user face is not detected, wherein the display is not turned on based on the fact that an authorized user face is not detected.

[0077] Clause 11. The method of any one of clauses 1 to 10, wherein determining the location of the wireless device further comprises measuring movement and orientation of the wireless device relative to a user of the wireless device.

[0078] Clause 12. The method of clause 11, wherein the orientation of the wireless device comprises rotational movement of the wireless device.

[0079] Clause 13. The method of any of clauses 11 to 12, wherein the movement and orientation of the wireless device is determined relative to a user of the wireless device.

[0080] Clause 14. The method of any of clauses 11 to 13, wherein the movement of the wireless device comprises a speed measurement.

[0081] Clause 15. The method of any one of clauses 1 to 14, wherein the low power image sensor comprises an image sensor and a low power processor.

[0082] Clause 16. A wireless device comprising: a memory; a light sensor; a low-power image sensor; a motion sensor; and at least one processor communicatively coupled to the memory, the light sensor, the motion sensor, and the low-power sensor, the at least one processor configured to: determine a change in ambient light received by the light sensor of the wireless device; determine a location of the wireless device using the motion sensor; activate the low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; detect a face using the low-power image sensor; and, based on an authorized user's face being the detected face, turn on a display of the wireless device.

[0083] Clause 17. The wireless device of clause 16, wherein the at least one processor is further configured to determine whether a change in ambient light exceeds a change threshold.

[0084] Clause 18. The wireless device of clause 17, wherein the change threshold is based on ambient light classified as one of low light, indoors, or outdoors.

[0085] Clause 19. The wireless device of any of clauses 17-18, wherein the at least one processor is further configured to determine whether the location of the wireless device allows a user of the wireless device to view the display.

[0086] Clause 20. The wireless device of clause 19, wherein the low power image sensor is activated when a change in ambient light exceeds a change threshold and the position of the wireless device allows a user to view the display.

[0087] Clause 21. A wireless device as described in any of clauses 19 to 20, wherein the position of the wireless device allows the user to view the display when the wireless device is at chest level of the user.

[0088] Clause 22. The wireless device of any of clauses 19 to 21, wherein the position of the wireless device that allows the user to view the display depends on the orientation of the user.

[0089] Clause 23. A wireless device according to any one of clauses 16 to 22, wherein the at least one processor is further configured to: detect the authorized user's face when the face is upright at an inclination less than a facial inclination threshold, wherein approximately 0 degrees is an orientation of the face upright.

[0090] Clause 24. A wireless device as described in clause 23, wherein the facial tilt threshold is negative 50 degrees to positive 50 degrees.

[0091] Clause 25. A wireless device according to any one of clauses 23 to 24, wherein the at least one processor is further configured to: determine that the face is upside down or has a tilt greater than a facial tilt threshold; and determine that an authorized user's face is not detected, wherein the display is not turned on based on the fact that an authorized user's face is not detected.

[0092] Clause 26. A wireless device as defined in any one of clauses 16 to 25, wherein determining the location of the wireless device further comprises measuring movement and orientation of the wireless device relative to a user of the wireless device.

[0093] Clause 27. The wireless device of clause 26, wherein the orientation of the wireless device comprises rotational movement of the wireless device.

[0094] Clause 28. A wireless device as defined in any one of clauses 26 to 27, wherein the movement and orientation of the wireless device is determined relative to a user of the wireless device.

[0095] Clause 29. A wireless device as defined in any one of clauses 26 to 28, wherein the movement of the wireless device comprises a speed measurement.

[0096] Clause 30. A wireless device as defined in any one of clauses 16 to 29, wherein the low power image sensor comprises an image sensor and a low power processor.

[0097] Clause 31. A wireless device comprising: components for determining a change in ambient light received by the wireless device; components for determining a location of the wireless device; components for activating a low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; components for detecting a face using the low-power image sensor; and components for turning on a display of the wireless device based on an authorized user's face being the detected face.

[0098] Clause 32. The wireless device of clause 31, further comprising: means for determining whether a change in ambient light exceeds a change threshold.

[0099] Clause 33. The wireless device of clause 32, further comprising means for determining whether the location of the wireless device allows a user of the wireless device to view the display.

[0100] Clause 34. A wireless device as defined in any of clauses 31 to 33, wherein the means for detecting a face further comprises means for determining that the face is upright at an inclination less than a facial inclination threshold.

[0101] Clause 35. A wireless device according to clause 34, wherein the component for detecting a face further comprises: a component for determining that the face is inverted or has a tilt greater than a facial tilt threshold; and a component for determining that the face of an authorized user is not detected, wherein the display is not turned on based on the fact that the face of an authorized user is not detected.

[0102] Item 36. A non-transitory computer-readable medium configured to store computer-executable instructions that, when executed by a processor, cause the processor to: determine a change in ambient light received by a light sensor of a wireless device; determine a location of the wireless device using a motion sensor; activate a low-power image sensor based on at least one of the change in ambient light or the location of the wireless device; detect a face using the low-power image sensor; and, based on an authorized user's face being the detected face, turn on a display of the wireless device.

[0103] Clause 37. The non-transitory computer-readable medium of clause 36, further comprising computer-executable instructions that, when executed by a processor, cause the processor to perform the following operations: detecting an authorized user face when the face is upright at an inclination less than a facial inclination threshold.

[0104] Clause 38. The non-transitory computer-readable medium of clause 37 further comprises computer executable instructions that, when executed by a processor, cause the processor to perform the following operations: determining that the face is inverted or has a tilt greater than a facial tilt threshold; and determining that an authorized user face is not detected, wherein the display is not turned on based on the fact that an authorized user face is not detected.

[0105] Clause 39. The non-transitory computer-readable medium of any of clauses 36 to 38, further comprising computer-executable instructions that, when executed by a processor, cause the processor to measure movement and orientation of the wireless device relative to a user of the wireless device.

[0106] Clause 40. The non-transitory computer-readable medium of clause 39, wherein the orientation of the wireless device comprises a rotational movement of the wireless device.

[0107] Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned in the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0108] Further, it will be appreciated by those skilled in the art that the various illustrative logic blocks, modules, circuits and algorithmic steps described in conjunction with the various aspects disclosed herein can be implemented as electronic hardware, computer software or a combination thereof. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits and steps have been generally described above according to their functions. Whether this function is implemented as hardware or software depends on the specific application and the design constraints to the entire system. The technician can implement the described functions in different ways for each specific application, but these implementation decisions should not be interpreted as departing from the scope of the present disclosure.

[0109] The various illustrative logical blocks, modules, and circuits described in conjunction with the various aspects disclosed herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors with a DSP core, or any other such configuration.

[0110] The methods, sequences and / or algorithms described in conjunction with the various aspects disclosed herein may be directly embodied in hardware, software modules executed by a processor, or a combination of the two. The software module may reside in a random access memory (RAM), flash memory, read-only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disks, removable hard disks, CD-ROMs, or any other form of storage medium known in the art. An example storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, the storage medium may be integrated into a processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal (e.g., UE). In an alternative, the processor and the storage medium may reside in a user terminal as discrete components.

[0111] In one or more example aspects, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, these functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, including any media that helps to transfer a computer program from one place to another. Storage media can be any available media that can be accessed by a computer. As an example and not limiting, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, disk storage devices or other magnetic storage devices, or any other media that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection is appropriately referred to as a computer-readable medium. For example, if the software is sent from a website, a server, or other remote sources using coaxial cables, optical fiber cables, twisted pairs, digital subscriber lines (DSL), or wireless technologies such as infrared, radio, and microwaves, coaxial cables, optical fiber cables, twisted pairs, DSL, or wireless technologies such as infrared, radio, and microwaves are all included in the definition of the medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0112] Although the above disclosure shows the illustrative aspects of the present disclosure, it should be noted that various changes and modifications may be made without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and / or actions of the method claims according to the various aspects disclosed herein do not need to be performed in any particular order. In addition, although the elements of the present disclosure may be described or claimed in the singular, plural forms are also considered unless explicitly stated to be limited to the singular.

Claims

1. A method performed by a wireless device, the method comprising: determining a change in ambient light received by a light sensor of the wireless device; determining a location of the wireless device using a motion sensor; activating a low power image sensor based on at least one of a change in the ambient light or a position of the wireless device; detecting a face using the low power image sensor; and Based on the authorized user's face being the detected face, turning on a display of the wireless device.

2. The method according to claim 1, further comprising: A determination is made as to whether a change in the ambient light exceeds a change threshold. 3 . The method of claim 2 , wherein the change threshold is based on ambient light classified as one of low light, indoor, or outdoor.

4. The method according to claim 2, further comprising: A determination is made as to whether the position of the wireless device allows a user of the wireless device to view the display.

5. The method according to claim 4, wherein: The low power image sensor is activated when a change in the ambient light exceeds the change threshold and the position of the wireless device allows the user to view the display.

6. The method according to claim 4, wherein: The position of the wireless device allows the user to view the display when the wireless device is at chest level of the user.

7. The method of claim 4, wherein a position of the wireless device that allows the user to view the display depends on an orientation of the user.

8. The method of claim 1, wherein detecting the face further comprises: The authorized user face is detected when the face is upright at an inclination less than a facial inclination threshold.

9. The method of claim 8, wherein the facial tilt threshold is negative 50 degrees to positive 50 degrees, with approximately 0 degrees being an orientation of the face upright.

10. The method of claim 8, wherein detecting the face further comprises: determining that the face is upside down or has a tilt greater than the face tilt threshold; as well as It is determined that the authorized user's face is not detected, wherein the display is not turned on based on the fact that the authorized user's face is not detected.

11. The method of claim 1 , wherein determining the location of the wireless device further comprises: Movement and orientation of the wireless device relative to a user of the wireless device is measured.

12. The method of claim 11, wherein the orientation of the wireless device comprises a rotational movement of the wireless device.

13. The method of claim 11, wherein the movement and orientation of the wireless device are determined relative to a user of the wireless device. The method of claim 11 , wherein the movement of the wireless device comprises a velocity measurement.

15. The method of claim 1, wherein the low power image sensor comprises an image sensor and a low power processor.

16. A wireless device comprising: Memory; Light sensor; Low-power image sensors; Motion sensor; as well as at least one processor communicatively coupled to the memory, the light sensor, the motion sensor, and the low-power image sensor, the at least one processor configured to: determining a change in ambient light received by the light sensor of the wireless device; determining a location of the wireless device using the motion sensor; activating the low power image sensor based on at least one of a change in the ambient light or a position of the wireless device; detecting a face using the low power image sensor; and Based on the authorized user's face being the detected face, turning on a display of the wireless device.

17. The wireless device of claim 16, wherein the at least one processor is further configured to: A determination is made as to whether a change in the ambient light exceeds a change threshold.

18. The wireless device of claim 17, wherein the change threshold is based on ambient light classified as one of low light, indoors, or outdoors.

19. The wireless device of claim 17, wherein the at least one processor is further configured to: A determination is made as to whether the position of the wireless device allows a user of the wireless device to view the display.

20. The wireless device of claim 19, wherein: The low power image sensor is activated when a change in the ambient light exceeds the change threshold and the position of the wireless device allows the user to view the display.

21. The wireless device of claim 19, wherein: The position of the wireless device allows the user to view the display when the wireless device is at chest level of the user.

22. The wireless device of claim 19, wherein a position of the wireless device that allows the user to view the display depends on an orientation of the user.

23. The wireless device of claim 16, wherein the at least one processor is further configured to: The authorized user face is detected when the face is upright at an inclination less than a facial inclination threshold.

24. The wireless device of claim 23, wherein the facial tilt threshold is negative 50 degrees to positive 50 degrees, with approximately 0 degrees being an orientation of the face upright.

25. The wireless device of claim 23, wherein the at least one processor is further configured to: determining that the face is upside down or has a tilt greater than the facial tilt threshold; and It is determined that the authorized user's face is not detected, wherein the display is not turned on based on the fact that the authorized face is not detected.

26. The wireless device of claim 16, wherein determining the location of the wireless device further comprises: Movement and orientation of the wireless device relative to a user of the wireless device is measured.

27. The wireless device of claim 26, wherein the orientation of the wireless device comprises a rotational movement of the wireless device.

28. The wireless device of claim 26, wherein movement and orientation of the wireless device are determined relative to the user of the wireless device.

29. The wireless device of claim 26, wherein the movement of the wireless device comprises a velocity measurement.

30. The wireless device of claim 16, wherein the low power image sensor comprises an image sensor and a low power processor.

31. A wireless device comprising: means for determining a change in ambient light received by the wireless device; means for determining a location of the wireless device; means for activating a low power image sensor based on at least one of the ambient light change or the location of the wireless device; means for detecting a face using the low power image sensor; as well as Means for activating a display of the wireless device based on an authorized user's face being the detected face.

32. The wireless device of claim 31 , further comprising: Means for determining whether a change in said ambient light exceeds a change threshold.

33. The wireless device of claim 32, further comprising: Means for determining whether the position of the wireless device allows a user of the wireless device to view the display.

34. The wireless device of claim 31 , wherein the means for detecting the face further comprises: Means for determining that the face is upright at an inclination less than a facial inclination threshold.

35. The wireless device of claim 34, wherein the means for detecting the face further comprises: means for determining that the face is upside down or has a tilt greater than the facial tilt threshold; as well as Means for determining that the authorized user's face is not detected, wherein the display is not turned on based on the fact that the authorized user's face is not detected.

36. A non-transitory computer readable medium configured to store computer executable instructions that, when executed by a processor, cause the processor to: determining a change in ambient light received by a light sensor of the wireless device; determining a location of the wireless device using a motion sensor; activating a low power image sensor based on at least one of the ambient light change or the location of the wireless device; detecting a face using the low power image sensor; and Based on the authorized user's face being the detected face, turning on a display of the wireless device.

37. The non-transitory computer-readable medium of claim 36, further comprising computer-executable instructions that, when executed by the processor, cause the processor to: The authorized user face is detected when the face is upright at an inclination less than a facial inclination threshold.

38. The non-transitory computer readable medium of claim 37, further comprising: Computer executable instructions which, when executed by the processor, cause the processor to: determining that the face is upside down or has a tilt greater than the facial tilt threshold; and It is determined that the authorized user's face is not detected, wherein the display is not turned on based on the fact that the authorized user's face is not detected.

39. The non-transitory computer-readable medium of claim 36, further comprising computer-executable instructions that, when executed by the processor, cause the processor to: Movement and orientation of the wireless device relative to a user of the wireless device is measured.

40. The non-transitory computer-readable medium of claim 39, wherein the orientation of the wireless device comprises a rotational movement of the wireless device.

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