WO2022022518A1 - 移动终端接入lte网络的方法、装置及系统 - Google Patents

移动终端接入lte网络的方法、装置及系统 Download PDF

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Publication number
WO2022022518A1
WO2022022518A1 PCT/CN2021/108695 CN2021108695W WO2022022518A1 WO 2022022518 A1 WO2022022518 A1 WO 2022022518A1 CN 2021108695 W CN2021108695 W CN 2021108695W WO 2022022518 A1 WO2022022518 A1 WO 2022022518A1
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WO
WIPO (PCT)
Prior art keywords
mobile terminal
duration
timer
attach
network device
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Application number
PCT/CN2021/108695
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English (en)
French (fr)
Inventor
李文姣
赵文龙
王鑫
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to US18/007,273 priority Critical patent/US20230276393A1/en
Publication of WO2022022518A1 publication Critical patent/WO2022022518A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/02—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration by periodical registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a method, an apparatus, and a system for a mobile terminal to access an LTE network.
  • a mobile terminal can access the network through attachment or tracking area update (TAU). Specifically, after the mobile terminal is powered on, it needs to be attached to the network to obtain resources allocated by the network and perform mobile services. During the moving process of the mobile terminal, the location area can be updated through the TAU to maintain the network connection.
  • TAU tracking area update
  • the mobile terminal may fail to access the network continuously.
  • the timer T3402 when the mobile terminal fails to continuously access the long term evolution (LTE) network, the timer T3402 will be started and disabled.
  • Evolved unified terrestrial radio access network evolved universal terrestrial radio access network, E-UTRA
  • the default duration of the T3402 timer is 12 minutes. After the T3402 timer expires, the mobile terminal can retry to access the LTE network.
  • the embodiments of the present application provide a method, device and system for a mobile terminal to access an LTE network, which can improve the efficiency of the mobile terminal accessing the LTE network during the movement of the mobile terminal, and provide users with a good experience in using the mobile terminal.
  • an embodiment of the present application provides a method for a mobile terminal to access an LTE network, and the method is applied to a mobile terminal.
  • the method may include: the number of times that the mobile terminal fails to attach or the TAU fails to reach a threshold; in response to the number of times that the mobile terminal fails to attach or the TAU fails to reach the threshold, the mobile terminal starts a T3402 timer and disables the E-UTRA capability; the T3402 timing
  • the duration of the timer is determined by the moving speed of the mobile terminal. When the moving speed reaches the first value, the duration of the T3402 timer is less than the first default duration; the mobile terminal searches the LTE network again after the T3402 timer expires. and send an attach request to the first network device.
  • the mobile terminal After implementing the method provided by the first aspect, after the mobile terminal starts the T3402 timer and disables the E-UTRA capability (disable the E-UTRA capability), if it moves at a faster speed, it may enter a coverage area with good LTE network conditions. Since the mobile terminal can re-access the LTE network after the T3402 timer determined by itself expires, there is no need to wait for the default duration of 12 minutes, and the mobile terminal can quickly access the LTE network after entering the coverage area with good network conditions. In this way, the efficiency of accessing the LTE network by the mobile terminal can be improved during the moving process of the mobile terminal, and a good experience of using the mobile terminal can be provided for the user.
  • the first default duration may be the default duration of T3402 of 12 minutes, or may be other preset values, which are not limited in the embodiments of the present application.
  • the threshold may be 5, or may be other preset values, which are not limited in this embodiment of the present application.
  • the number of times that the mobile terminal fails to attach reaches the threshold may refer to: the mobile terminal sends n attach requests to the second network device successively; The response message sent by the second network device, or the attach rejection message sent by the second network device is received; n is equal to the threshold.
  • the number of times that the TAU failure of the mobile terminal reaches the threshold may refer to: the mobile terminal sends n TAU requests to the second network device successively; The response message sent by the second network device, or the TAU rejection message sent by the second network device is received; n is equal to the threshold.
  • the threshold number of attachment failures that occur in the mobile terminal may be for the same cell, or may be for different cells.
  • the mobile terminal when the mobile terminal fails to attach for a threshold number of times, the mobile terminal may be in a stationary state or in a moving state.
  • the mobile terminal may determine the duration of the T3402 timer in the following ways:
  • the duration of the T3402 timer determined by the mobile terminal is less than the default duration of the T3402 timer.
  • the first value may be preset, for example, may be 200 km/h, which is not limited in this embodiment of the present application.
  • the duration of the T3402 timer when the moving speed of the mobile terminal is equal to the first value, the duration of the T3402 timer is equal to the first duration; when the moving speed of the mobile terminal 10 is equal to the second value, the duration of the T3402 timer is equal to the second duration .
  • the second value is greater than the first value, the second duration is shorter than the first duration, and both the first duration and the second duration are smaller than the default duration of the T3402 timer. That is to say, the faster the moving speed, the shorter the duration of the T3402 timer determined by the mobile terminal.
  • the duration of the T3402 timer determined by the mobile terminal is different.
  • the duration of the T3402 timer determined by the mobile terminal is different.
  • the duration of the T3402 timer determined by the mobile terminal is the duration corresponding to the interval in which the current moving speed of the mobile terminal is located.
  • the value of the duration of the T3402 timer is a fixed second default duration.
  • the second default duration is smaller than the first default duration.
  • the duration of the T3402 timer determined by the mobile terminal may remain the default duration.
  • the mobile terminal may also detect movement speed before starting the T3402 timer and disabling the E-UTRA capability.
  • the mobile terminal may periodically detect its own movement speed after being powered on, or may start to detect its own movement speed when it detects that the number of times of attachment or TAU failure reaches a threshold, which is not limited in this embodiment of the present application.
  • the mobile terminal detects its own movement speed in the following ways:
  • the mobile terminal can be used to obtain the real-time location information of the mobile terminal through GNSS such as GPS, BDS, GLONASS, QZSS or SBAS, and then according to the real-time location information of the mobile terminal at any two time points, determine whether the mobile terminal is at these two times. Move distance between points, and calculate movement speed.
  • GNSS such as GPS, BDS, GLONASS, QZSS or SBAS
  • the mobile terminal can also use the signals monitored by GNSS to calculate the moving speed through the original Doppler observations or the Doppler observations obtained from the carrier phase center difference.
  • the mobile terminal can measure the acceleration value, and integrate the measured acceleration to obtain the moving speed.
  • the mobile terminal When the mobile terminal is located on a public transportation vehicle (such as high-speed rail, bullet train, and airplane), the mobile terminal can communicate with the mobile terminal through short-range communication technologies such as BT, Wi-Fi, NFC, light fidelity (LiFi), etc.
  • the public transport vehicle establishes a short-distance communication connection, and then acquires speed information shared by the public transport vehicle based on the short-distance communication connection.
  • disabling the E-UTRA capability of the mobile terminal means that the mobile terminal no longer operates in the 4G frequency band and does not search for any signal in the 4G frequency band.
  • the disabling of the E-UTRA capability by the mobile terminal can also be regarded as disabling the LTE network by the mobile terminal.
  • the mobile terminal when the mobile terminal is moving fast, when the mobile terminal restores the E-UTRA capability and sends an attach request to the first network device, it may have entered a coverage area with good LTE network conditions. In this way, after the mobile terminal sends the attach request to the first network device, the mobile terminal may receive an attach accept message (attach accept) sent by the network device 200, that is, the mobile terminal may successfully access the LTE network.
  • attach accept attach accept
  • the mobile terminal may further display a first user interface, where the first user interface includes a first area.
  • the first area does not display the content, or the first area displays the identifier of the network currently accessed by the mobile terminal; in the mobile terminal After receiving the attach accept message sent by the first network device, the first area displays the identity of the LTE network. In this way, the user can be prompted about the current connection between the mobile terminal and the network through the content displayed on the first area.
  • an embodiment of the present application provides a mobile terminal, including one or more processors and one or more memories.
  • the one or more memories are coupled with one or more processors, and the one or more memories are used to store computer program codes, and the computer program codes include computer instructions, when the one or more processors execute the computer instructions, the terminal can execute the above The method in the first aspect or any possible implementation manner of the first aspect.
  • an embodiment of the present application provides a computer storage medium, including computer instructions, when the computer instructions are executed on a terminal, the communication device is made to execute the first aspect or any possible implementation manner of the first aspect.
  • an embodiment of the present application provides a computer program product that, when the computer program product runs on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.
  • an embodiment of the present application provides a mobile communication system, where the mobile communication system includes: a mobile terminal, a first network device and a second network device; wherein the mobile terminal is the mobile terminal described in the second aspect.
  • the mobile terminal when the number of times of attach failure or TAU failure reaches the threshold, the mobile terminal starts the T3402 timer and disables the E-UTRA capability, and re-attempts to access the LTE network after the T3402 timer expires.
  • the duration of the T3402 timer is determined by the moving speed of the mobile terminal. When the moving speed reaches the first value, the value of the T3402 timer is less than the default duration. If the mobile terminal moves at a relatively fast speed, it may enter an area covered by a good LTE network, and at this time, the mobile terminal can quickly access the LTE network. In this way, the efficiency of accessing the LTE network by the mobile terminal can be improved during the moving process of the mobile terminal, and a good experience of using the mobile terminal can be provided for the user.
  • FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • FIG. 2A is a schematic diagram of a hardware structure of a mobile terminal provided by an embodiment of the present application.
  • 2B is a schematic diagram of a software structure of a mobile terminal provided by an embodiment of the application.
  • FIG. 3 is a schematic diagram of a hardware structure of a network device provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of an attachment (attach) of a mobile terminal provided by an embodiment of the present application
  • FIG. 5 is a schematic flowchart of a method for a mobile terminal to access an LTE network according to an embodiment of the present application
  • FIG. 6 is a schematic flowchart of a TAU of a mobile terminal provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another method for a mobile terminal to access an LTE network according to an embodiment of the present application.
  • 8A and 8B provide a set of user interfaces implemented on a mobile terminal according to an embodiment of the present application.
  • first and second are only used for descriptive purposes, and should not be construed as implying or implying relative importance or implying the number of indicated technical features. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, the “multiple” The meaning is two or more.
  • GUI graphical user interface
  • the mobile terminal when the mobile terminal fails to continuously access the LTE network, it will start the T3402 timer and disable the E-UTRA capability.
  • the default duration of the T3402 timer is 12 minutes.
  • the mobile terminal can retry to access the LTE network. That is to say, within 12 minutes, even if the mobile terminal moves to a coverage area with good network conditions, it still cannot access the LTE network. Such a mechanism leads to low efficiency of the mobile terminal accessing the LTE network.
  • the embodiments of the present application provide a method, an apparatus, and a system for a mobile terminal to access an LTE network.
  • the mobile terminal can determine the value of the T3402 timer according to its own moving speed without using the default duration.
  • the moving speed reaches the first value, the value of the T3402 timer determined by the mobile terminal is smaller than the default duration, that is, the value of the T3402 timer is decreased.
  • the default duration of the T3402 timer may be referred to as the first default duration.
  • the first default duration may be 12 minutes as defined in TS 24.301, or may be other values, which are not limited in this embodiment of the present application.
  • the mobile terminal After the mobile terminal starts the T3402 timer and disables the E-UTRA capability (disable the E-UTRA capability), if it moves at a faster speed, it may enter a coverage area with good LTE network conditions.
  • the mobile terminal since the mobile terminal can re-access the LTE network after the T3402 timer determined by itself expires, there is no need to wait for the default time period, and the mobile terminal can quickly connect to the network after entering the coverage area with good network conditions. Access the LTE network, improve the efficiency of accessing the LTE network, and provide users with a good mobile terminal experience.
  • the scenarios in which the mobile terminal fails to continuously access the LTE network may specifically include: scenario 1.
  • the TAU of the mobile terminal fails, and the number of TAU attempts reaches a preset value. Subsequent method embodiments will describe the two scenarios in detail, which will not be repeated here.
  • disabling the E-UTRA capability (disable the E-UTRA capability) of the mobile terminal means that the mobile terminal no longer works in the 4G frequency band and does not search for any signal in the 4G frequency band.
  • the disabling of the E-UTRA capability by the mobile terminal can also be regarded as disabling the LTE network by the mobile terminal.
  • FIG. 1 shows an architecture of a mobile communication system 10 provided by an embodiment of the present application.
  • the mobile communication system 10 is an LTE system.
  • the mobile communication system 10 may include: a mobile terminal 100, and a 4G system (evolved packet system, EPS).
  • 4G system evolved packet system, EPS
  • the mobile terminal 100 may include a smart phone (such as a mobile phone equipped with an Android system or an iOS system, etc.), a wearable device (such as a smart watch, a smart bracelet, etc.), a tablet computer, a notebook computer, a handheld computer, a mobile Internet device (MID, mobile internet device) or other removable portable devices.
  • the mobile terminal 100 may also be referred to as user equipment (UE).
  • UE user equipment
  • the mobile terminal 100 provides a solution for 4G wireless communication.
  • the mobile terminal 100 may also provide solutions including 2G/3G/5G wireless communication. That is to say, the mobile terminal 100 supports 4G (ie, LTE), and can also support 2G, 3G, 5G, and even mobile communication solutions developed in the future.
  • 4G ie, LTE
  • the user information is stored in the mobile terminal 100 .
  • the user information may include an IMSI, which may be stored in a subscriber identity module (SIM) card of the mobile terminal 100.
  • SIM subscriber identity module
  • the mobile terminal 100 can use the user information as an identity to connect to the network device 200, thereby accessing the LTE network, and using the resources allocated by the LTE network to perform mobile services, for example, using the Internet Protocol Multimedia Subsystem (IMS) ) long term evolution (voice on long term evolution, VoLTE) to initiate calls, acquire video resources, acquire audio resources, and so on.
  • IMS Internet Protocol Multimedia Subsystem
  • the mobile terminal 100 may access the LTE network through an attach or TAU.
  • attach for the detailed process of attaching (attach) and TAU, reference may be made to related descriptions in subsequent method embodiments.
  • the T3402 timer when the mobile terminal 100 fails to access the LTE network continuously, the T3402 timer can be started and the E-UTRA capability is disabled. After the T3402 timer expires, the mobile terminal 100 retry to access the LTE network.
  • the value of the T3402 timer is determined by the mobile terminal 100 according to its own moving speed. When the moving speed reaches the first value, the value of the T3402 timer determined by the mobile terminal is less than the default duration of 12 minutes. In this way, it can be ensured that the mobile terminal 100 can quickly access the LTE network after entering the coverage area of the LTE network in good condition, improve the efficiency of accessing the LTE network, and provide users with a good experience in using the mobile terminal.
  • the EPS may include one or more network devices 200 .
  • the network device 200 is configured to allocate network resources to the mobile terminal 100 to support mobile services of the mobile terminal 100 after the mobile terminal 100 accesses the LTE network.
  • the network device 200 may include, for example, a 4G base station, a 4G core network (evolved packet core, EPC) device, and the like.
  • the 4G base station is connected to the EPC device.
  • the number of 4G base stations and EPC devices may be one or more. in:
  • a 4G base station can be an evolved Node B (eNodeB), an access point (AP), a transmit/receive point (TRP), a central unit (CU) or other network entities.
  • eNodeB evolved Node B
  • AP access point
  • TRP transmit/receive point
  • CU central unit
  • the EPC equipment may include the following network elements: a mobility management entity (MME), a serving gateway (SGW), a packet data network gateway (PGW), a home subscriber server (home subscriber server) , HSS) and application servers, etc.
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data network gateway
  • HSS home subscriber server
  • application servers etc.
  • the main purpose of the MME is to provide access control, mobility management, attach and detach, session management (eg, bearer establishment, modification and release), etc. for the mobile terminal 100 .
  • the signal coverage of a 4G base station can be divided into multiple tracking areas (TA), or the signal coverage of multiple 4G base stations can form a TA.
  • the mobile terminal 100 needs to register with one or more TAs so that the EPC device can perform paging management. Specifically, the EPC device can page the terminal within the TA to which the mobile terminal 100 is registered without searching in the entire network. If the terminal in the idle state moves out of the currently registered TA during the moving process, it initiates a TAU process to inform the new TA where the EPC device is currently located.
  • FIG. 2A exemplarily shows a schematic structural diagram of a mobile terminal 100 provided by an embodiment of the present application.
  • the mobile terminal 100 may include: a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2.
  • Mobile communication module 150 wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, headphone jack 170D, sensor module 180, buttons 190, motor 191, indicator 192, camera 193, display screen 194, And a subscriber identification module (subscriber identification module, SIM) card interface 195 and so on.
  • SIM subscriber identification module
  • the sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, and ambient light. Sensor 180L, bone conduction sensor 180M, etc.
  • the structures illustrated in the embodiments of the present application do not constitute a specific limitation on the mobile terminal 100 .
  • the mobile terminal 100 may include more or less components than shown, or combine some components, or separate some components, or arrange different components.
  • the illustrated components may be implemented in hardware, software, or a combination of software and hardware.
  • the processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), controller, memory, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural-network processing unit (NPU) Wait. Wherein, different processing units may be independent devices, or may be integrated in one or more processors.
  • application processor application processor, AP
  • modem processor graphics processor
  • graphics processor graphics processor
  • ISP image signal processor
  • controller memory
  • video codec digital signal processor
  • DSP digital signal processor
  • NPU neural-network processing unit
  • the controller may be the nerve center and command center of the mobile terminal 100 .
  • the controller can generate an operation control signal according to the instruction operation code and timing signal, and complete the control of fetching and executing instructions.
  • a memory may also be provided in the processor 110 for storing instructions and data.
  • the memory in processor 110 is cache memory. This memory may hold instructions or data that have just been used or recycled by the processor 110 . If the processor 110 needs to use the instruction or data again, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby increasing the efficiency of the system.
  • the wireless communication function of the mobile terminal 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modulation and demodulation processor, the baseband processor, and the like.
  • Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals.
  • Each antenna in the mobile terminal 100 may be used to cover a single or multiple communication frequency bands.
  • the antenna 1 can cover the 4G communication frequency band
  • the antenna 2 can cover the 2G/3G/5G communication frequency band.
  • Different antennas can also be reused to improve antenna utilization.
  • the antenna 1 can be multiplexed as a diversity antenna of the wireless local area network.
  • the antenna may be used in conjunction with a tuning switch.
  • the mobile communication module 150 provides a solution for 4G wireless communication applied on the mobile terminal 100 .
  • the mobile communication module 150 may also provide a solution including 2G/3G/5G wireless communication applied on the mobile terminal 100 .
  • the mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (LNA) and the like.
  • the mobile communication module 150 can receive electromagnetic waves from the antenna 1, filter and amplify the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation.
  • the mobile communication module 150 can also amplify the signal modulated by the modulation and demodulation processor, and then turn it into an electromagnetic wave for radiation through the antenna 1 .
  • at least part of the functional modules of the mobile communication module 150 may be provided in the processor 110 .
  • at least part of the functional modules of the mobile communication module 150 may be provided in the same device as at least part of the modules of the processor 110 .
  • the modem processor may include a modulator and a demodulator.
  • the modulator is used to modulate the low frequency baseband signal to be sent into a medium and high frequency signal.
  • the demodulator is used to demodulate the received electromagnetic wave signal into a low frequency baseband signal. Then the demodulator transmits the demodulated low-frequency baseband signal to the baseband processor for processing.
  • the low frequency baseband signal is processed by the baseband processor and passed to the application processor.
  • the application processor outputs sound signals through audio devices (not limited to the speaker 170A, the receiver 170B, etc.), or displays images or videos through the display screen 194 .
  • the modem processor may be a stand-alone device.
  • the modem processor may be independent of the processor 110, and may be provided in the same device as the mobile communication module 150 or other functional modules.
  • the wireless communication module 160 can provide applications on the mobile terminal 100 including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (bl mobile terminal tooth, BT), Global navigation satellite system (GNSS), frequency modulation (freq mobile terminal ncy modulation, FM), near field communication technology (near field communication, NFC), infrared technology (infrared, IR) and other wireless communication solutions .
  • WLAN wireless local area networks
  • BT Bluetooth
  • GNSS Global navigation satellite system
  • frequency modulation frequency modulation
  • FM frequency modulation
  • NFC near field communication technology
  • infrared technology infrared, IR
  • the wireless communication module 160 may be one or more devices integrating at least one communication processing module.
  • the wireless communication module 160 receives electromagnetic waves via the antenna 2 , demodulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110 .
  • the wireless communication module 160 can also receive the signal to be sent from the processor 110 , perform frequency modulation on it, amplif
  • the antenna 1 of the mobile terminal 100 is coupled with the mobile communication module 150, and the antenna 2 is coupled with the wireless communication module 160, so that the mobile terminal 100 can communicate with the network and other devices through wireless communication technology.
  • the wireless communication technology may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), broadband Code Division Multiple Access (WCDMA), Time Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), BT, GNSS, WLAN, NFC , FM, and/or IR technology, etc.
  • the GNSS may include global positioning system (global positioning system, GPS), global navigation satellite system (global navigation satellite system, GLONASS), Beidou navigation satellite system (beidou navigation satellite system, BDS), quasi-zenith satellite system (quasi -zenith satellite system, QZSS), Galileo satellite navigation system (galileo satellite navigation system) and/or satellite based augmentation systems (SBAS).
  • global positioning system global positioning system, GPS
  • global navigation satellite system global navigation satellite system
  • GLONASS global navigation satellite system
  • Beidou navigation satellite system beidou navigation satellite system, BDS
  • quasi-zenith satellite system quadsi -zenith satellite system, QZSS
  • Galileo satellite navigation system galileo satellite navigation system
  • SBAS satellite based augmentation systems
  • the mobile terminal 100 implements a display function through a GPU, a display screen 194, an application processor, and the like.
  • the GPU is a microprocessor for image processing, and is connected to the display screen 194 and the application processor.
  • the GPU is used to perform mathematical and geometric calculations for graphics rendering.
  • Processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.
  • Display screen 194 is used to display images, videos, and the like.
  • Display screen 194 includes a display panel.
  • the display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (active-matrix organic light).
  • LED diode AMOLED
  • flexible light-emitting diode flexible light-emitting diode (flex light-emitting diode, FLED), Miniled, MicroLed, Micro-oLed, quantum dot light-emitting diode (quantum dot light emitting diodes, QLED) and so on.
  • the mobile terminal 100 may include one or N display screens 194 , where N is a positive integer greater than one.
  • Internal memory 121 may be used to store computer executable program code, which includes instructions.
  • the processor 110 executes various functional applications and data processing of the mobile terminal 100 by executing the instructions stored in the internal memory 121 .
  • the internal memory 121 may include a storage program area and a storage data area.
  • the storage program area can store an operating system, an application program required for at least one function (such as a sound playback function, an image playback function, etc.), and the like.
  • the storage data area may store data (such as audio data, phone book, etc.) created during the use of the mobile terminal 100 and the like.
  • the internal memory 121 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, universal flash storage (UFS), and the like.
  • the pressure sensor 180A is used to sense pressure signals, and can convert the pressure signals into electrical signals.
  • the pressure sensor 180A may be provided on the display screen 194 .
  • the capacitive pressure sensor may be comprised of at least two parallel plates of conductive material. When a force is applied to the pressure sensor 180A, the capacitance between the electrodes changes.
  • the mobile terminal 100 determines the intensity of the pressure according to the change in capacitance. When a touch operation acts on the display screen 194, the mobile terminal 100 detects the intensity of the touch operation according to the pressure sensor 180A.
  • the mobile terminal 100 may also calculate the touched position according to the detection signal of the pressure sensor 180A.
  • touch operations acting on the same touch position but with different touch operation intensities may correspond to different operation instructions. For example, when a touch operation whose intensity is less than the first pressure threshold acts on the short message application icon, the instruction for viewing the short message is executed. When a touch operation whose intensity is greater than or equal to the first pressure threshold acts on the short message application icon, the instruction to create a new short message is executed.
  • the gyro sensor 180B may be used to determine the motion attitude of the mobile terminal 100 .
  • the angular velocity of the mobile terminal 100 about three axes ie, x, y and z axes
  • the gyro sensor 180B may be determined by the gyro sensor 180B.
  • the acceleration sensor 180E can detect the magnitude of the acceleration of the mobile terminal 100 in various directions (generally three axes).
  • the magnitude and direction of gravity can be detected when the mobile terminal 100 is stationary. It can also be used to identify the posture of mobile terminals, and can be used in horizontal and vertical screen switching, pedometers and other applications.
  • the mobile terminal 100 may measure the distance through infrared or laser.
  • Touch sensor 180K also called “touch panel”.
  • the touch sensor 180K may be disposed on the display screen 194 , and the touch sensor 180K and the display screen 194 form a touch screen, also called a “touch screen”.
  • the touch sensor 180K is used to detect a touch operation on or near it.
  • the touch sensor can pass the detected touch operation to the application processor to determine the type of touch event.
  • Visual output related to touch operations may be provided through display screen 194 .
  • the touch sensor 180K may also be disposed on the surface of the mobile terminal 100 , which is different from the position where the display screen 194 is located.
  • the SIM card interface 195 is used to connect a SIM card.
  • the SIM card can be connected to and separated from the mobile terminal 100 by inserting into the SIM card interface 195 or pulling out from the SIM card interface 195 .
  • the mobile terminal 100 may support 1 or N SIM card interfaces, where N is a positive integer greater than 1.
  • the SIM card interface 195 can support Nano SIM card, Micro SIM card, SIM card and so on. Multiple cards can be inserted into the same SIM card interface 195 at the same time.
  • the wireless communication module 160 may be used to obtain real-time location information of the mobile terminal 100 through GNSS such as GPS, BDS, GLONASS, QZSS or SBAS.
  • the processor 110 may determine the moving distance of the mobile terminal 100 between the two time points and calculate the moving speed according to the real-time location information of the mobile terminal 100 at any two time points.
  • the processor 110 may also use the signal monitored by the wireless communication module 160 using the GNSS to calculate the original Doppler observation value or the Doppler observation value obtained by the carrier phase center difference Moving speed.
  • the processor 110 may use the measurement value of the acceleration sensor 180E to integrate the measured acceleration to obtain the movement speed.
  • the wireless communication module 160 can use a short-range communication technology such as BT, Wi-Fi, NFC, optical fidelity Technology (light fidelity, LiFi), etc. establishes a short-distance communication connection with public transportation, and then obtains speed information shared by public transportation based on the short-distance communication connection.
  • the processor 110 may be configured to parse the signal received by the wireless communication module 160 based on the short-range communication connection, so as to determine the moving speed of the mobile terminal 100 .
  • the processor 201 may be configured to determine the value of the T3402 timer according to the moving speed of the mobile terminal 100 when the mobile terminal 100 fails to continuously access the LTE network, and start the T3402 timer.
  • the value of the T3402 timer determined by the processor 201 is less than the default duration of 12 minutes, that is, the value of the T3402 timer is reduced.
  • the mobile communication module 150 may be configured to disable the E-UTRA capability after the T3402 timer is started.
  • the mobile communication module 150 is further configured to restore the E-UTRA capability and retry to access the LTE network after the T3402 timer expires.
  • the software system of the mobile terminal 100 may adopt a layered architecture, an event-driven architecture, a microkernel architecture, a microservice architecture, or a cloud architecture.
  • the embodiments of the present application take an Android system with a layered architecture as an example to exemplarily describe the software structure of the mobile terminal 100 .
  • FIG. 2B is a block diagram of the software structure of the mobile terminal 100 according to the embodiment of the present application.
  • the layered architecture divides the software into several layers, and each layer has a clear role and division of labor. Layers communicate with each other through software interfaces.
  • the Android system is divided into four layers, which are, from top to bottom, an application layer, an application framework layer, an Android runtime (Android runtime) and a system library, and a kernel layer.
  • the application layer can include a series of application packages.
  • the application package may include applications such as camera, gallery, calendar, call, map, navigation, WLAN, Bluetooth, music, video, short message, etc.
  • the application framework layer provides an application programming interface (application programming interface, API) and a programming framework for applications in the application layer.
  • the application framework layer includes some predefined functions.
  • the application framework layer may include a window manager, a content provider, a view system, a telephony manager, a resource manager, a notification manager, and the like.
  • a window manager is used to manage window programs.
  • the window manager can get the size of the display screen, determine whether there is a status bar, lock the screen, take screenshots, etc.
  • Content providers are used to store and retrieve data and make these data accessible to applications.
  • the data may include video, images, audio, calls made and received, browsing history and bookmarks, phone book, etc.
  • the view system includes visual controls, such as controls for displaying text, controls for displaying pictures, and so on. View systems can be used to build applications.
  • a display interface can consist of one or more views.
  • the display interface including the short message notification icon may include a view for displaying text and a view for displaying pictures.
  • the phone manager is used to provide the communication function of the mobile terminal 100 .
  • the management of call status including connecting, hanging up, etc.).
  • the resource manager provides various resources for the application, such as localization strings, icons, pictures, layout files, video files and so on.
  • the notification manager enables applications to display notification information in the status bar, which can be used to convey notification-type messages, and can automatically disappear after a brief pause without user interaction. For example, the notification manager is used to notify download completion, message reminders, etc.
  • the notification manager can also display notifications in the status bar at the top of the system in the form of graphs or scroll bar text, such as notifications of applications running in the background, and notifications that appear on the screen in the form of dialog windows. For example, text information is prompted in the status bar, a prompt sound is issued, the mobile terminal vibrates, and the indicator light flashes.
  • Android Runtime includes core libraries and a virtual machine. Android runtime is responsible for scheduling and management of the Android system.
  • the core library consists of two parts: one is the function functions that the java language needs to call, and the other is the core library of Android.
  • the application layer and the application framework layer run in virtual machines.
  • the virtual machine executes the java files of the application layer and the application framework layer as binary files.
  • the virtual machine is used to perform functions such as object lifecycle management, stack management, thread management, safety and exception management, and garbage collection.
  • a system library can include multiple functional modules. For example: surface manager (surface manager), media library (Media Libraries), 3D graphics processing library (eg: OpenGL ES), 2D graphics engine (eg: SGL), etc.
  • surface manager surface manager
  • media library Media Libraries
  • 3D graphics processing library eg: OpenGL ES
  • 2D graphics engine eg: SGL
  • the Surface Manager is used to manage the display subsystem and provides a fusion of 2D and 3D layers for multiple applications.
  • the media library supports playback and recording of a variety of commonly used audio and video formats, as well as still image files.
  • the media library can support a variety of audio and video encoding formats, such as: MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, etc.
  • the 3D graphics processing library is used to implement 3D graphics drawing, image rendering, compositing, and layer processing.
  • 2D graphics engine is a drawing engine for 2D drawing.
  • the kernel layer is the layer between hardware and software.
  • the kernel layer contains at least display drivers, camera drivers, audio drivers, and sensor drivers.
  • FIG. 3 is a schematic structural diagram of a network device 200 according to an embodiment of the present application.
  • the network device 200 shown in FIG. 3 may be an MME or an eNodeB in the communication system 10 shown in FIG. 1 , which is not limited in this embodiment of the present application.
  • network device 200 may include: one or more processors 201 , memory 202 , communication interface 203 , transmitter 205 , receiver 206 , coupler 207 , and antenna 208 . These components may be connected through the bus 204 or in other ways, and FIG. 3 takes the connection through the bus as an example. in:
  • the communication interface 203 may be used for the network device 200 to communicate with other communication devices, such as mobile terminals or other network devices.
  • the communication interface 203 may be an LTE communication interface.
  • the network device 200 may also be configured with a wired communication interface 203 to support wired communication, for example, a backhaul link between one network device 200 and other network devices 200 may be a wired communication connection.
  • the transmitter 205 and the receiver 206 may be regarded as a wireless modem.
  • the transmitter 205 can be used for transmitting and processing the signal output by the processor 201 .
  • a receiver 206 may be used to receive signals.
  • the number of the transmitter 205 and the receiver 206 may be one or more.
  • Antenna 208 may be used to convert electromagnetic energy in a transmission line to electromagnetic waves in free space, or to convert electromagnetic waves in free space to electromagnetic energy in a transmission line.
  • the coupler 207 can be used to divide the mobile communication signal into multiple paths for distribution to a plurality of receivers 206 . It will be appreciated that the antenna 208 of the network device may be implemented as a large scale antenna array.
  • Memory 202 is coupled to processor 201 for storing various software programs and/or sets of instructions.
  • memory 202 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices.
  • the memory 202 may store an operating system (hereinafter referred to as a system), such as an embedded operating system such as uCOS, VxWorks, and RTLinux.
  • a system such as an embedded operating system such as uCOS, VxWorks, and RTLinux.
  • the memory 202 may also store network communication programs that may be used to communicate with one or more additional devices, one or more mobile devices, one or more network devices.
  • the processor 201 may be configured to read and execute computer-readable instructions. Specifically, the processor 201 may be configured to call a program stored in the memory 202, such as an implementation program on the network device 200 side of the method for accessing an LTE network by a mobile terminal provided by one or more embodiments of this application, and execute the program Included directives.
  • a program stored in the memory 202 such as an implementation program on the network device 200 side of the method for accessing an LTE network by a mobile terminal provided by one or more embodiments of this application, and execute the program Included directives.
  • the network device 200 shown in FIG. 3 is only an implementation manner of the embodiments of the present application. In practical applications, the network device 200 may further include more or less components, which is not limited here.
  • the method for accessing the LTE network by the mobile terminal provided by the embodiments of the present application is described in detail below with reference to the mobile communication system 10 shown in FIG. 1 , the mobile terminal 100 shown in FIG. 2A and FIG. 2B , and the network device 200 shown in FIG.
  • the following describes the method for a mobile terminal to access an LTE network provided by the embodiments of the present application in two embodiments.
  • Embodiment 1 when the mobile terminal 100 fails to attach and the number of attempts to attach reaches the threshold, the mobile terminal 100 starts the T3402 timer and disables the E-UTRA capability. After the T3402 timer expires, the mobile terminal 100 tries to access the LTE network again. The value of the T3402 timer is determined by the mobile terminal 100 according to its own moving speed.
  • Embodiment 1 Before entering Embodiment 1, the attach process involved in Embodiment 1 is first introduced.
  • Attachment is a process in which the mobile terminal 100 registers with the EPC in order to obtain the service, the EPC allocates an internet protocol (IP) address to the mobile terminal 100, establishes a connection, establishes a default bearer, and generates a security context.
  • IP internet protocol
  • the mobile terminal 100 may initiate an attach (attach) after being powered on, or may initiate an attach (attach) when roaming occurs. It is understandable that, for the timing and purpose of the mobile terminal 100 initiating an attach, reference may be made to the relevant content in TS24.301, which will not be repeated here.
  • FIG. 4 illustrates an attach process of the mobile terminal 100.
  • the network device 200 in FIG. 4 may be an MME, and the messages transmitted between the MME and the mobile terminal 100 in FIG. 4 are all transparently transmitted through the eNodeB.
  • the mobile terminal 100 first sends an attach request (attach request) to the network device 200, and simultaneously starts the T3410 timer.
  • the value of the T3402 timer can refer to the provisions in TS24.301, for example, it can be 15 seconds.
  • a possible situation is that after receiving the attach request, the network device 200 sends an attach accept message (attach accept) to the mobile terminal 100; when the mobile terminal 100 receives the attach accept message, it stops the T3410 timer, and then replies that the attachment is complete (accept). complete) message to successfully attach.
  • attach accept attach accept
  • the mobile terminal 100 stops the T3410 timer, and then replies that the attachment is complete (accept). complete) message to successfully attach.
  • the network device 200 sends an attach reject message (attach reject) to the mobile terminal 100; when the mobile terminal 100 receives the attach reject message, it stops the T3410 timer and the attachment fails.
  • attach reject attach reject
  • the failure to attach (attach) of the mobile terminal 100 may include network congestion such as too many devices currently attached to the network device 200, poor signal of the network device 200, large interference between the mobile terminal 100 and the network device 200, and the mobile terminal 100 does not support the current public land mobile network.
  • public land mobile network, PLMN public land mobile network
  • the PLMN where the mobile terminal 100 is currently located does not support EPS services
  • the service option requested by the mobile terminal 100 is not configured in the currently located PLMN, and so on.
  • the mobile terminal 100 may determine that the current attachment (attach) fails in any of the following cases:
  • the mobile terminal 100 After sending the attach request (attach request), the mobile terminal 100 receives the attach reject (attach reject) message.
  • the mobile terminal 100 does not receive any response message from the network device 200 within the running period of the T3410 timer after the mobile terminal 100 sends the attach request.
  • FIG. 5 shows a flow of a method for a mobile terminal to access an LTE network provided in Embodiment 1.
  • the method may include the following steps:
  • the mobile terminal 100 fails to attach (attach), and the number of attempts to attach (attach) reaches a threshold.
  • the specific situation of the failure of the mobile terminal 100 to attach (attach) can refer to the relevant description of FIG. 4 , for example, it may include that the mobile terminal 100 receives an attach reject message, or the T3410 timer runs after sending the attach request (attach request). During this period, no response message from the network device 200 is received.
  • the number of times the mobile terminal 100 attempts to attach may be determined by the value of an attach attempt counter (attach attempt counter). Specifically, the mobile terminal 100 may maintain an attach attempt counter.
  • the attach attempt counter is used to indicate the number of times the mobile terminal 100 attempts to attach but is rejected.
  • the maximum value of the attach attempt counter is the threshold.
  • the threshold can be preset, for example, it can be 5. This embodiment of the present application does not limit the threshold.
  • S110 is that the number of times the mobile terminal 100 fails to attach reaches the threshold.
  • S110 may be: the mobile device 100 successively sends n attach requests (attach requests), and each time the T3410 timer runs after sending the attach request, no response message from the network device 200 is received or Both receive the attach rejection message sent by the network device 200 .
  • n takes the threshold value.
  • the mobile device 100 starts the T3410 timer after sending the attach request. If the T3410 timer does not receive a response message from the network device 200 during the running period of the T3410 timer, after the T3410 timer times out, the T3410 timer is released and RRC connection between network devices 200, and then send the next attach request (attach request) after a period of time (for example, 10 seconds).
  • the mobile terminal 100 starts the T3410 timer after sending the attach request, and if an attach reject message is received during the running of the T3410 timer, the RRC connection with the network device 200 is released. , and then send the next attach request after a period of time (for example, 10 seconds).
  • the attachment failure of the mobile terminal 100 for the threshold number of times in S110 may be for the same cell or may be for different cells, which is not limited here.
  • the mobile terminal 100 may be in a stationary state or in a moving state, which is not limited here.
  • the number of times that the mobile terminal 100 fails to attach to the same cell in a stationary state reaches a threshold.
  • the mobile terminal 100 starts the T3402 timer and disables the E-UTRA capability (disable the E-UTRA capability).
  • the duration of the T3402 timer is determined by the moving speed of the mobile terminal 100.
  • the mobile terminal 100 may start the T3402 timer and disable the E-UTRA capability at the same time. After the T3402 timer expires, that is, after the duration of the T3402 timer elapses, the mobile terminal 100 restores the E-UTRA capability.
  • the duration of the T3402 timer is determined by the mobile terminal 100 according to its own moving speed.
  • the mobile terminal 100 may detect its own movement speed after S110, or may periodically detect its own movement speed after being powered on, which is not limited in this embodiment of the present application.
  • the mobile terminal 100 can detect its own movement speed in the following ways:
  • the mobile terminal 100 can be used to obtain the real-time location information of the mobile terminal 100 through GNSS such as GPS, BDS, GLONASS, QZSS or SBAS, and then according to the real-time location information of the mobile terminal 100 at any two time points, determine that the mobile terminal 100 is in The movement distance between the two time points, and the movement speed is calculated.
  • GNSS such as GPS, BDS, GLONASS, QZSS or SBAS
  • the mobile terminal 100 can also use the signals monitored by GNSS to calculate the moving speed through raw Doppler observations or Doppler observations obtained from carrier phase center difference.
  • the mobile terminal 100 may measure the acceleration value, and integrate the measured acceleration to obtain the moving speed.
  • the mobile terminal 100 When the mobile terminal 100 is located on a public transportation vehicle (such as a high-speed rail, a motor car, an airplane), the mobile terminal 100 can use short-range communication technologies such as BT, Wi-Fi, NFC, and light fidelity (LiFi) and so on to establish a short-distance communication connection with the public transport, and then acquire the speed information shared by the public transport based on the short-distance communication connection.
  • a public transportation vehicle such as a high-speed rail, a motor car, an airplane
  • the mobile terminal 100 determines the duration of the T3402 timer according to its own moving speed. The following describes how the mobile terminal 100 determines the duration of the T3402 timer in two different cases:
  • the duration of the T3402 timer determined by the mobile terminal 100 is smaller than the default duration of the T3402 timer.
  • the first value may be preset, for example, may be 200 km/h, which is not limited in this embodiment of the present application.
  • the following introduces several ways for the mobile terminal 100 to determine the duration of the T3402 timer when the moving speed of the mobile terminal 100 reaches the first value:
  • the duration of the T3402 timer is equal to the first duration; when the moving speed of the mobile terminal 10 is equal to the second value, the duration of the T3402 timer is equal to the second duration.
  • the second value is greater than the first value, the second duration is shorter than the first duration, and both the first duration and the second duration are smaller than the default duration of the T3402 timer. That is to say, the faster the moving speed, the shorter the duration of the T3402 timer determined by the mobile terminal 100.
  • the duration of the T3402 timer determined by the mobile terminal 100 is different.
  • the duration of the T3402 timer determined by the mobile terminal is different.
  • the mobile terminal 100 may divide the movement speed greater than or equal to the first value into multiple non-overlapping intervals, each interval corresponds to a duration, and the greater the movement speed in the interval, the smaller the corresponding duration.
  • the division of the interval and the duration corresponding to each interval may be preset, which is not limited in the embodiment of the present application.
  • the mobile terminal 100 may divide the moving speed greater than 200km/h into the following intervals: 200km/h ⁇ moving speed ⁇ 220km/h, 220km/h ⁇ moving speed ⁇ 250km/h, 250km/h ⁇ moving Speed ⁇ 300km/h; the corresponding durations of several intervals can be: 10 minutes, 8 minutes, 6 minutes.
  • the duration of the T3402 timer determined by the mobile terminal 100 is the duration corresponding to the interval in which the current moving speed of the mobile terminal 100 is located.
  • the value of the duration of the T3402 timer is a fixed second default duration.
  • the second default duration is smaller than the default duration of the T3402 timer.
  • the second default duration may be preset, for example, may be set to 8 minutes, which is not limited here.
  • the duration of the T3402 timer determined by the mobile terminal 100 may remain the default duration.
  • disabling the E-UTRA capability (disable the E-UTRA capability) of the mobile terminal 100 means that the mobile terminal no longer works in the 4G frequency band and does not search for any signal in the 4G frequency band.
  • the disabling of the E-UTRA capability by the mobile terminal can also be regarded as disabling the LTE network by the mobile terminal.
  • the mobile terminal 100 can also work in other frequency bands, search for signals in other frequency bands, and access networks of other standards.
  • the mobile terminal 100 can also search for signals on the 5G/3G/2G frequency band, and access the 5G/3G/2G network and the network developed in the future.
  • the mobile terminal 100 can set priorities in advance, and access other standard networks according to the priority order. For example, the mobile terminal 100 can preferentially access the 5G network, followed by the 3G network, and finally the 2G network.
  • the mobile terminal 100 may only prohibit searching for the cell that fails to attach in S110 during the running of the T3402 timer, but can also search for LTE other districts under the standard. In this way, the range of cells that can be searched by the mobile terminal 100 can be increased, and the efficiency of accessing the LTE network by the mobile terminal 100 can be further improved. In a specific example, if the threshold number of attachment failures in S110 are all for the same cell, the mobile terminal 100 may prohibit searching for the cell during the running of the timer T3402.
  • the mobile terminal 100 searches the LTE network again, and initiates an attach.
  • the mobile terminal 100 can restore the E-UTRA capability, search for the LTE network again, and initiate an attach to access the LTE network.
  • S130 is a process in which the mobile terminal 100 searches the LTE network and initiates attachment. The process can be divided into the following steps:
  • the mobile terminal 100 first searches for the PLMN requested by the non-access stratum (NAS), scans all radio frequency RF channels in the E-UTRA frequency band (ie, the 4G frequency band) to find the PLMN, searches for the cell with the strongest signal and reads The system information determines the PLMN, confirms that the cell selection criteria all meet the S criterion, and further camps on the selected cell. The mobile terminal 100 camps on the cell, that is, the mobile terminal 100 searches for the LTE network.
  • NAS non-access stratum
  • the mobile terminal 100 first performs a random access procedure, and after successfully establishing an RRC connection, initiates an attach request for registration. After the registration is successful, the LTE network is successfully connected, and then various services provided by the network side, such as data services, voice services, etc., can be used.
  • the mobile terminal 100 may re-search the LTE network after the T3402 timer expires, that is, search for the 4G signal transmitted by the 4G base station. After searching for an LTE network, an attach can be initiated to the corresponding network device 200 .
  • an attach can be initiated to the corresponding network device 200 .
  • the mobile terminal 100 initiating an attach reference may be made to the process shown in FIG. 4 .
  • the mobile terminal 100 may send an attach request to the network device 200 again.
  • the interactive network device 200 when the mobile terminal 100 is attached (attached) in S110 and S130 It may or may not be the same network device.
  • the mobile terminal 100 attempts to attach several times and fails in S110, there may be one or more network devices interacting with the mobile terminal 100, which is not limited in this embodiment of the present application.
  • the network device that interacts with the mobile terminal 100 in S110 may be referred to as the second network device
  • the network device that interacts with the mobile terminal 100 in S130 is referred to as the first network device. a network device.
  • the mobile terminal 100 may have entered a coverage area with good LTE network conditions when performing S130.
  • the mobile terminal 100 can receive the attach accept message (attach accept message) sent by the network device 200. accept), and can reply an attach complete (accept complete) message to the network device 200, so as to successfully attach, that is, to successfully access the LTE network.
  • attach accept message attach accept message
  • accept complete attach complete
  • the mobile terminal 100 after multiple attachment failures, if the mobile terminal 100 moves to a coverage area with good LTE network conditions, it can re-access the LTE network after the T3402 timer determined by itself expires, without the need for Wait the default time of 12 minutes. That is, the mobile terminal 100 can quickly access the LTE network, which improves the efficiency of accessing the LTE network, and can provide users with a good experience in using the mobile terminal.
  • the mobile terminal 100 may reset the attach attempt counter to 0 in the following situations:
  • the mobile terminal 100 is powered on;
  • a new PLMN is selected
  • attach reject is received with the cause #11, #12, #13, #14, #15, #25 or #35;
  • the network side initiates detach, and the carrying reason is #11, #12, #13, #14, #15 or #25.
  • the attach procedure shall be aborted, and the UE shall proceed as described below.
  • the UE shall abort the attach procedure and proceed as described below.
  • the NAS signalling connection if any, shall be released locally.
  • the UE shall start timer T3346 with the "Extended wait time” value and reset the attach attempt counter.
  • the UE is operating in NB-S1mode and the UE is not a UE configured to use AC11–15in selected PLMN,then the UE shall start timer T3346 with the "Extended wait time” value and reset the attach attempt counter.
  • the UE shall abort the attach procedure, stay in the current serving cell, change the state to EMM-DEREGISTERED. ATTEMPTING-TO-ATTACH and apply the normal cell reselection process.
  • the UE shall proceed as described below.
  • the UE shall start the timer T3346 with the "Extended wait time CP data" value and reset the attach attempt counter.
  • the UE shall ignore the "Extended wait time CP data".
  • the UE shall abort the attach procedure, stay in the current serving cell, change the state to EMM-DEREGISTERED. ATTEMPTING-TO-ATTACH and apply the normal cell reselection process.
  • the UE shall proceed as described below.
  • the mobile terminal 100 (ie, the UE) may increment the value of the attach attempt counter by 1 in the following situations:
  • Case b means that when the lower layer fails or the NAS signaling connection is released, the mobile terminal 100 does not receive an "extended wait” message from the lower layer before receiving the attach accept message or the attach reject message. Time” and "Extended Latency CP Data"; the attach process will be aborted and the mobile terminal 100 will proceed as described below.
  • Case c means that T3410 times out.
  • the mobile terminal 100 will abort the attach process and proceed as described below.
  • NAS signalling connections (if any) shall be released locally.
  • Condition d means, Attach refusal, other than those stated in 5.5.1.2.5, the reason value for other EMMs; if considered an abnormal condition according to clause 5.5.1.2.5, the condition of EMM leads to #22, #25 and #31.
  • Case 1 refers to the "extended latency" of the lower layers. If the attach reject message contains a low priority indicator set to "MS configured for NAS signaling low priority", the mobile terminal 100 shall initiate T3346 with the "extended latency” value and reset the connection try counter. If the attach request does not contain a low priority indicator set to "MS is configured for NAS signaling low priority", it indicates that the mobile terminal 100 is operating in NB-S1 mode and the mobile terminal 100 is not in the selected The mobile terminal 100 in the PLMN is configured to use AC11-15, then the mobile terminal 100 shall start T3346 with the "extended latency” value and reset the connection attempt counter. In other cases, the mobile terminal 100 will ignore the "extended waiting time”. The mobile terminal 100 will abort the attach procedure, stay in the current serving cell, change the state to EMM-DEregister.ATTEMPTING-TO-ATTACH, and apply the normal cell reselection procedure. The mobile terminal 100 will proceed as follows.
  • Case la refers to "extended latency CP data" from lower layers. If the mobile terminal 100 is operating in NB-S1 mode, the mobile terminal 100 shall initiate T3346 with the "extended latency CP data" value and reset the connection attempt counter.
  • the mobile terminal 100 will ignore the "extended latency CP data".
  • the mobile terminal 100 will abort the attach procedure, stay in the current serving cell, change the state to EMM-DEregister.ATTEMPTING-TO-ATTACH, and apply the normal cell reselection procedure.
  • the mobile terminal 100 will proceed as follows.
  • the mobile terminal 100 starts the T3402 timer and disables the E-UTRA capability when the TAU fails and the number of TAU attempts reaches the threshold. After the T3402 timer expires, the mobile terminal 100 attempts to access the LTE network. The value of the T3402 timer is determined by the mobile terminal 100 according to its own moving speed.
  • TAU is a process for the mobile terminal 100 to register TA-level location information on the network side, periodically indicate online, load balance on the network side, and update parameters (eg network capabilities) of the mobile terminal 100.
  • the mobile terminal 100 may initiate a TAU when entering a new TA and the TA is not in the TA list stored by the mobile terminal 100, the network side initiates a TAU, and the parameters need to be updated. It is understandable that, for the timing and purpose of TAU initiation by the mobile terminal 100, reference may be made to the relevant content in TS24.301, which will not be repeated here.
  • FIG. 6 shows a TAU flow of the mobile terminal 100 .
  • This process can refer to the relevant content defined in TS24.3015.5.3 formulated by 3GPP.
  • the network device 200 in FIG. 6 may be an MME, and the messages transmitted between the MME and the mobile terminal 100 in FIG. 6 are all transparently transmitted through the eNodeB.
  • the mobile terminal 100 first sends a TAU request (tracking area update request) to the network device 200, and simultaneously starts the T3430 timer.
  • the value of the T3430 timer can refer to the provisions in TS24.301, for example, it can be 15 seconds.
  • a possible situation is that after receiving the TAU request, the network device 200 sends a TAU accept message (tracking area update accept) to the mobile terminal 100; when the mobile terminal 100 receives the TAU accept message, it stops the T3430 timer. If the mobile terminal 100 is configured with a globally unique temporary UE identity (globally unique temporary UE identity, GUTI), it can reply to a TAU complete (tracking area update complete) message, thereby successfully attaching.
  • a globally unique temporary UE identity globally unique temporary UE identity, GUTI
  • the network device 200 sends a TAU rejection message (tracking area update reject) to the mobile terminal 100; when the mobile terminal 100 receives the TAU rejection message, it stops the T3430 timer and the TAU fails.
  • a TAU rejection message tilt area update reject
  • the mobile terminal 100 TAU may include network congestion such as too many devices currently attached to the network device 200, poor signal of the network device 200, large interference between the mobile terminal 100 and the network device 200, and the mobile terminal 100 does not support the current public land mobile network.
  • public land mobile network, PLMN public land mobile network
  • the PLMN where the mobile terminal 100 is currently located does not support EPS services
  • the service option requested by the mobile terminal 100 is not configured in the currently located PLMN, and so on.
  • the mobile terminal 100 may determine that the current TAU fails in any of the following situations:
  • the mobile terminal 100 After sending the TAU request, the mobile terminal 100 receives a TAU rejection message.
  • the mobile terminal 100 does not receive any response message from the network device 200 within the running period of the T3430 timer after the mobile terminal 100 sends the TAU request.
  • FIG. 7 shows a flow of a method for a mobile terminal to access an LTE network provided in Embodiment 2.
  • the method may include the following steps:
  • the mobile terminal 100 fails to TAU, and the number of times of TAU attempts reaches a threshold.
  • the specific situation of the TAU failure of the mobile terminal 100 can refer to the relevant description in FIG. 6 , for example, it may include that the mobile terminal 100 receives a TAU rejection message, or does not receive any response message from the network device 200 during the running of the T3430 timer after sending the TAU request. .
  • the number of times the mobile terminal 100 attempts the TAU may be determined by the value of the TAU attempt counter (TAU attempt counter). Specifically, the mobile terminal 100 may maintain a TAU attempt counter.
  • the TAU attempt counter is used to indicate the number of times the mobile terminal 100 has attempted TAU and was rejected.
  • the maximum value of the TAU attempt counter is the threshold.
  • the threshold can be preset, for example, it can be 5. This embodiment of the present application does not limit the threshold.
  • S210 is that the number of times that the mobile terminal 100 TAU fails reaches the threshold.
  • S210 may be: the mobile device 100 sends the TAU request n times successively, and each time the T3430 timer runs after sending the TAU request, neither receives the response message from the network device 200 nor receives the network device 200 at all. TAU reject message sent by device 200. Among them, n takes the threshold value.
  • the mobile device 100 starts the T3430 timer after sending the TAU request. If the T3430 timer does not receive a response message from the network device 200 during the running period of the T3430 timer, after the T3430 timer expires, it releases the connection with the network device 200. RRC connection between the two, and then send the next TAU request after a period of time (for example, 10 seconds).
  • the mobile terminal 100 starts the T3430 timer after sending the TAU request, and if it receives a TAU rejection message during the running of the T3430 timer, it releases the RRC connection with the network device 200, and then a period of time (for example, 10 seconds) and then send the next TAU request.
  • a period of time for example, 10 seconds
  • the threshold number of TAU failures of the mobile terminal 100 in S210 may be for the same cell or may be for different cells, which is not limited here.
  • the mobile terminal 100 may be in a stationary state or in a moving state, which is not limited here.
  • the mobile terminal 100 may be in a static state, and the number of TAU failures in the same cell reaches a threshold.
  • the mobile terminal 100 starts the T3402 timer and disables the E-UTRA capability (disable the E-UTRA capability).
  • the duration of the T3402 timer is determined by the moving speed of the mobile terminal 100.
  • the mobile terminal 100 may start the T3402 timer and disable the E-UTRA capability at the same time. After the T3402 timer expires, that is, after the duration of the T3402 timer, the mobile terminal 100 restores the E-UTRA capability.
  • CAUSE OF START T3402 At tracking area updating failure and the attempt counter is equal to 5, that is, the mobile device starts when TAU fails and the number of TAU attempts reaches 5 T3402 timer.
  • Embodiment 2 of the present application the manner in which the mobile terminal 100 determines the duration of the T3402 timer according to its own moving speed is the same as that in Embodiment 1, and reference may be made to the relevant description of S120 in Embodiment 1, which is not repeated here.
  • disabling the E-UTRA capability (disable the E-UTRA capability) of the mobile terminal 100 means that the mobile terminal no longer works in the 4G frequency band and does not search for any signal in the 4G frequency band.
  • the disabling of the E-UTRA capability by the mobile terminal can also be regarded as disabling the LTE network by the mobile terminal.
  • the mobile terminal 100 can also work in other frequency bands, search for signals in other frequency bands, and access networks of other standards.
  • the mobile terminal 100 can also search for signals on the 5G/3G/2G frequency band, and access the 5G/3G/2G network and the network developed in the future.
  • the mobile terminal 100 can set priorities in advance, and access other standard networks according to the priority order. For example, the mobile terminal 100 can preferentially access the 5G network, followed by the 3G network, and finally the 2G network.
  • the mobile terminal 100 may only prohibit searching for the cell where the TAU failed in S210 during the running of the T3402 timer, but can also search for LTE other districts under the standard. In this way, the range of cells that can be searched by the mobile terminal 100 can be increased, and the efficiency of accessing the LTE network by the mobile terminal 100 can be further improved. In a specific example, if the threshold number of TAU failures in S210 are all for the same cell, the mobile terminal 100 may prohibit searching for the cell during the running of the timer T3402.
  • the mobile terminal 100 searches the LTE network again, and initiates an attach.
  • S230 is the same as S130 in Embodiment 1, and related descriptions can be referred to, and details are not repeated here.
  • the mobile terminal 100 may re-search the LTE network after the T3402 timer expires, that is, search for the 4G signal transmitted by the 4G base station. After searching for an LTE network, an attach can be initiated to the corresponding network device 200 .
  • an attach can be initiated to the corresponding network device 200 .
  • the mobile terminal 100 initiating an attach reference may be made to the process shown in FIG. 4 .
  • the mobile terminal 100 may send an attach request to the network device 200 again.
  • the position where the mobile terminal 100 executes S210 and S230 may vary greatly. Therefore, in S210, when the mobile terminal 100 TAU interacts with when the mobile terminal 100 is attached in S230
  • the network device 200 may be the same network device, or may not be the same network device.
  • the mobile terminal 100 attempts TAU several times and fails in S210 there may be one or more network devices interacting with the mobile terminal 100, which is not limited in this embodiment of the present application.
  • the network device interacting with the mobile terminal 100 TAU in S210 may be referred to as the second network device, and the network device interacting with the mobile terminal 100 in S230 during attachment may be referred to as the first network device.
  • the mobile terminal 100 may have entered a coverage area with good LTE network conditions when performing S230.
  • the mobile terminal 100 can receive the attach accept message (attach accept message) sent by the network device 200. accept), and can reply an attach complete (accept complete) message to the network device 200, so as to successfully attach, that is, to successfully access the LTE network.
  • attach accept message attach accept message
  • accept complete attach complete
  • the mobile terminal 100 after multiple TAU failures, if the mobile terminal 100 moves to a coverage area with good LTE network conditions, it can re-access the LTE network after the T3402 timer determined by itself expires, without waiting for the default duration 12 minutes. That is, the mobile terminal 100 can quickly access the LTE network, which improves the efficiency of accessing the LTE network, and can provide users with a good experience in using the mobile terminal.
  • the mobile terminal 100 may reset the TAU attempt counter to 0 in the following situations:
  • TAU fails, and the carrying reason is #11, #12, #13, #14, #15, #25 or #35;
  • the mobile terminal 100 selects a new PLMN
  • the mobile terminal 100 is in the EMM-REGISTERED.ATTEMPTING-TO-UPDATE state, and has entered a new TA;
  • the mobile terminal 100 is in the EMM-REGISTERED.ATTEMPTING-TO-UPDATE state, and T3402 is activated;
  • the mobile terminal 100 is in the EMM-REGISTERED.ATTEMPTING-TO-UPDATE state, and T3346 is activated;
  • the UE shall stop timer T3430 if still running, and shall enter state MM IDLE.
  • the tracking area updating attempt counter shall be incremented, unless it was already set to 5.
  • the UE shall proceed as follows: The UE shall stop timer T3430if still running,and shall enter state MM IDLE. The tracking area updating attempt counter shall be incremented,unless it was already set to 5;
  • the mobile terminal 100 may increment the value of the TAU attempt counter by 1 in the following situations:
  • the mobile terminal 100 should follow the steps below Ongoing: If the T3410 is still running, it should stop the T3410 and enter state MM IDLE. If the value of the TAU attempt counter is less than 5, the value of the TAU attempt counter is incremented by 1.
  • FIG. 8A and FIG. 8B it shows a set of user interfaces implemented on the mobile terminal 100 provided by the embodiments of the present application.
  • a status bar is displayed in the user interface of the mobile terminal 100 , and the status bar includes a network identifier, and the network identifier is used to indicate the network currently accessed by the mobile terminal.
  • the implementation form of the network identification may be text, icon, etc., which is not limited in this embodiment of the present application.
  • the network identifier 801 may be empty, that is, the network identifier is not displayed. If the mobile terminal 100 falls back to a 2G/3G network or searches for a 5G network during the process of disabling the E-UTRA capability, the network identifier 801 can be displayed as a 2G/3G/5G network identifier, such as the text "2G", "3G" or " 5G" and so on.
  • the mobile terminal 100 fails to continuously access the LTE network, reference may be made to the related descriptions of Embodiment 1 and Embodiment 2.
  • the network identifier 801 displayed in the user interface can be used to indicate the LTE network, for example Can be the text "4G".
  • the user interface shown in FIG. 8A and FIG. 8B may be referred to as the first user interface, and the area for displaying the network identifier in the user interface may be referred to as the first area.
  • the technical solutions described in the embodiments of the present application may also be applied to the scenario in which the mobile terminal accesses networks of other standards.
  • Networks of other standards may include, but are not limited to, 2G, 3G, new radio (new radio, NR) and other networks in the future development process, and so on.
  • a timer can be started, and the NR capability can be disabled (disable the NR capability).
  • the mobile terminal 100 re-attempts to access the NR network.
  • the value of the timer is determined by the mobile terminal 100 according to its own moving speed.
  • a related protocol which is not limited here.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions when loaded and executed on a computer, result in whole or in part of the processes or functions described herein.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk), and the like.
  • the process can be completed by instructing the relevant hardware by a computer program, and the program can be stored in a computer-readable storage medium.
  • the program When the program is executed , which may include the processes of the foregoing method embodiments.
  • the aforementioned storage medium includes: ROM or random storage memory RAM, magnetic disk or optical disk and other mediums that can store program codes.

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Abstract

本申请实施例提供了的技术方案移动终端接入LTE网络的方法、装置及系统。在该方法中，移动终端在附着失败或者TAU失败的次数达到阈值时，启动T3402定时器并禁用E-UTRA能力，在该T3402定时器超时后重新尝试接入LTE网络。该T3402定时器的时长由移动终端的移动速度来决定，当移动速度达到第一值时，该T3402定时器的值小于默认时长。如果移动终端以较快的速度移动，可能进入到LTE网络状况良好的覆盖区域，此时移动终端能够快速地接入LTE网络。这样可以在移动终端的移动过程中，提高移动终端接入LTE网络的效率，为用户提供良好的移动终端使用体验。

Description

移动终端接入LTE网络的方法、装置及系统
本申请要求于2020年07月30日提交中国专利局、申请号为202010753652.8、申请名称为“移动终端接入LTE网络的方法、装置及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及移动终端接入LTE网络的方法、装置及系统。
背景技术
在移动通信系统中，移动终端可以通过附着(attach)或跟踪区更新(tracking area updata，TAU)来接入网络。具体的，移动终端开机后需要附着到网络，以获得网络分配的资源，进行移动业务。移动终端在移动过程中，可以通过TAU更新位置区，以保持网络连接。
在某些场景中，比如网络拥塞或者干扰较大时，移动终端可能连续接入网络失败。根据第三代合作伙伴计划(3rd generation partnership project，3GPP)制定的TS 24.301中的定义，移动终端连续接入长期演进(long term evolution，LTE)网络失败时，将会启动T3402定时器，并禁用进化型的统一陆地无线接入网络(evolved universal terrestrial radio access network，E-UTRA)能力(disable the E-UTRA capability)。T3402定时器的默认时长为12分钟。T3402定时器超时后，移动终端才能重新尝试接入LTE网络。
发明内容
本申请实施例提供了移动终端接入LTE网络的方法、装置及系统，可以在移动终端的移动过程中，提高移动终端接入LTE网络的效率，为用户提供良好的移动终端使用体验。
第一方面，本申请实施例提供了移动终端接入LTE网络的方法，该方法应用于移动终端。该方法可包括：移动终端附着失败或TAU失败的次数达到阈值；响应于该移动终端附着失败或TAU失败的次数达到阈值，该移动终端启动T3402定时器，并禁用E-UTRA能力；该T3402定时器的时长由该移动终端的移动速度决定，当该移动速度达到第一值时，该T3402定时器的时长小于第一默认时长；该移动终端在该T3402定时器超时后，重新搜索LTE网络，并向第一网络设备发送附着请求。
实施第一方面提供的方法，移动终端启动T3402定时器并禁用E-UTRA能力(disablethe E-UTRA capability)后，如果以较快的速度移动，则可能进入到LTE网络状况良好的覆盖区域。由于移动终端在自身确定的T3402定时器超时后即可重新接入LTE网络，无需等待默认时长12分钟，移动终端在进入网络状况良好的覆盖区域后能够快速地接入LTE网络。这样可以在移动终端的移动过程中，提高移动终端接入LTE网络的效率，为用户提供良好的移动终端使用体验。
结合第一方面，在一些实施例中，第一默认时长可以为T3402的默认时长12分钟，也 可以为其他预设值，本申请实施例不作限制。
结合第一方面，在一些实施例中，阈值可以为5，也可以为其他预设值，本申请实施例不作限制。
结合第一方面，在一些实施例中，移动终端附着失败的次数达到阈值可以是指：移动终端先后向第二网络设备发送n次附着请求；其中，每一次发送该附着请求之后，均未收到该第二网络设备发送的响应消息，或者，均接收到该第二网络设备发送的附着拒绝消息；n等于该阈值。
结合第一方面，在一些实施例中，移动终端TAU失败的次数达到阈值可以是指：移动终端先后向第二网络设备发送n次TAU请求；其中，每一次发送该TAU请求之后，均未收到该第二网络设备发送的响应消息，或者，均接收到该第二网络设备发送的TAU拒绝消息；n等于该阈值。
结合第一方面，移动终端发生的阈值次数的附着失败可能是针对同一小区的，也可能是针对不同小区的。
结合第一方面，移动终端发生阈值次数的附着失败时，移动终端可以处于静止状态，也可以处于移动状态。
结合第一方面，在一些实施例中，移动终端可通过以下几种方式来确定该T3402定时器的时长：
(1)当移动终端的移动速度达到第一值时，移动终端确定的T3402定时器的时长小于T3402定时器的默认时长。这里，第一值可以预先设置，例如可以为200km/h，本申请实施例对此不作限制。
在一些实施例中，当移动终端的移动速度等于第一值时，T3402定时器的时长等于第一时长；当移动终端10的移动速度等于第二值时，T3402定时器的时长等于第二时长。其中，第二值大于第一值，第二时长小于第一时长，第一时长和第二时长均小于T3402定时器的默认时长。也就是说，移动速度越快，移动终端确定的T3402定时器的时长越小。
在一种实施方式中，移动速度不同时，移动终端确定的T3402定时器的时长不同。
在另一种实施方式中，移动速度所在区间不同时，移动终端确定的T3402定时器的时长不同。在移动终端的移动速度达到第一值时，移动终端确定的T3402定时器的时长为，当前移动终端的移动速度所在区间对应的时长。
在另一些实施例中，当移动终端的移动速度达到第一值时，不管该移动速度具体是多少，该T3402定时器的时长的取值均为固定的第二默认时长。该第二默认时长小于第一默认时长。
(2)当移动终端的移动速度小于第一值时，移动终端确定的T3402定时器的时长可保持默认时长。
结合第一方面，在一些实施例中，移动终端启动T3402定时器并禁用E-UTRA能力之前，还可以检测移动速度。这里，移动终端可以在开机后周期性地检测自身的移动速度，也可以在检测到附着或TAU失败次数达到阈值时开始检测自身的移动速度，本申请实施例对此不作限制。
结合第一方面，在一些实施例中，移动终端通过以下几种方式来检测自身的移动速度：
(1)移动终端可用于通过GNSS例如GPS、BDS、GLONASS、QZSS或SBAS获得移动终端的实时位置信息，然后根据移动终端在任意两个时间点的实时位置信息，确定移动终端在该两个时间点之间的移动距离，并计算移动速度。
(2)移动终端还可以使用GNSS监测到的信号，通过原始多普勒观测值或由载波相位中心差分所获得的多普勒观测值，来计算移动速度。
(3)移动终端可测量加速度值，并对测得的加速度进行积分得到移动速度。
(4)当移动终端位于公共交通工具(例如高铁、动车、飞机)上时，移动终端可通过短距离通信技术例如BT、Wi-Fi、NFC、光保真技术(light fidelity，LiFi)等与公共交通工具建立短距离通信连接，然后基于该短距离通信连接获取公共交通工具共享的速度信息。
结合第一方面，在一些实施例中，移动终端禁用E-UTRA能力(disablethe E-UTRA capability)是指移动终端不再在4G频段上工作，不搜索4G频段上的任何信号。移动终端禁用E-UTRA能力也可以看作该移动终端禁用LTE网络。
结合第一方面，在一些实施例中，当移动终端快速移动的情况下，移动终端恢复E-UTRA能力并向第一网络设备发送附着请求时，可能已进入到LTE网络状况良好的覆盖区域。这样，移动终端向第一网络设备发送附着请求后，移动终端可能接收到网络设备200发送的附着接受消息(attach accept)，即移动终端可能成功接入LTE网络。
结合第一方面，在一些实施例中，该移动终端还可以显示第一用户界面，该第一用户界面包括第一区域。其中，在该移动终端接收到该第一网络设备发送的附着接受消息之前，该第一区域不显示内容，或者，该第一区域显示当前该移动终端接入的网络的标识；在该移动终端接收到该第一网络设备发送的附着接受消息之后，该第一区域显示该LTE网络的标识。这样可以通过第一区域上显示的内容来提示用户当前移动终端和网络的连接情况。
第二方面，本申请实施例提供了一种移动终端，包括一个或多个处理器和一个或多个存储器。该一个或多个存储器与一个或多个处理器耦合，一个或多个存储器用于存储计算机程序代码，计算机程序代码包括计算机指令，当一个或多个处理器执行计算机指令时，使得终端执行上述第一方面或第一方面的任一种可能的实现方式中的方法。
第三方面，本申请实施例提供了一种计算机存储介质，包括计算机指令，当计算机指令在终端上运行时，使得通信装置执行上述第一方面或第一方面的任一种可能的实现方式中的方法。
第四方面，本申请实施例提供了一种计算机程序产品，当计算机程序产品在计算机上运行时，使得计算机执行上述第一方面或第一方面的任一种可能的实现方式中的方法。
第五方面，本申请实施例提供了一种移动通信系统，该移动通信系统包括：移动终端，第一网络设备和第二网络设备；其中，移动终端为第二方面所述的移动终端。
实施本申请实施例提供的技术方案，移动终端在附着失败或者TAU失败的次数达到阈值时，启动T3402定时器并禁用E-UTRA能力，在该T3402定时器超时后重新尝试接入LTE网络。该T3402定时器的时长由移动终端的移动速度来决定，当移动速度达到第一值时，该T3402定时器的值小于默认时长。如果移动终端以较快的速度移动，可能进入到LTE网络状况良好的覆盖区域，此时移动终端能够快速地接入LTE网络。这样可以在移动终端的移动过程中，提高移动终端接入LTE网络的效率，为用户提供良好的移动终端使用体验。
附图说明
图1为本申请实施例提供的通信系统的结构示意图；
图2A为本申请实施例提供的移动终端的硬件结构示意图；
图2B为本申请实施例提供的移动终端的软件结构示意图；
图3为本申请实施例提供的网络设备的硬件结构示意图；
图4为本申请实施例提供的移动终端的附着(attach)流程示意图；
图5为本申请实施例提供的一种移动终端接入LTE网络的方法的流程示意图；
图6为本申请实施例提供的移动终端的TAU流程示意图；
图7为本申请实施例提供的另一种移动终端接入LTE网络的方法的流程示意图；
图8A和图8B为本申请实施例提供的在移动终端上实现的一组用户界面。
具体实施方式
下面将结合附图对本申请实施例中的技术方案进行清楚、详尽地描述。其中，在本申请实施例的描述中，除非另有说明，“/”表示或的意思，例如，A/B可以表示A或B；文本中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，另外，在本申请实施例的描述中，“多个”是指两个或多于两个。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为暗示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征，在本申请实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
本申请以下实施例中的术语“用户界面(user interface，UI)”，是应用程序或操作系统与用户之间进行交互和信息交换的介质接口，它实现信息的内部形式与用户可以接受形式之间的转换。用户界面是通过java、可扩展标记语言(extensible markup language，XML)等特定计算机语言编写的源代码，界面源代码在电子设备上经过解析，渲染，最终呈现为用户可以识别的内容。用户界面常用的表现形式是图形用户界面(graphic user interface，GUI)，是指采用图形方式显示的与计算机操作相关的用户界面。它可以是在电子设备的显示屏中显示的文本、图标、按钮、菜单、选项卡、文本框、对话框、状态栏、导航栏、Widget等可视的界面元素。
根据3GPP制定的TS 24.301中的定义，移动终端连续接入LTE网络失败时，将会启动T3402定时器，并禁用E-UTRA能力(disablethe E-UTRA capability)。T3402定时器的默认时长为12分钟。T3402定时器超时后，移动终端才能重新尝试接入LTE网络。也就是说，在12分钟内，即使移动终端移动到了网络状况良好的覆盖区域，也仍然不能接入LTE网络。这样的机制导致移动终端接入LTE网络的效率较低。
基于目前移动终端接入LTE网络的效率较低的问题，本申请实施例提供了移动终端接入LTE网络的方法、装置及系统。在该方法中，移动终端可以根据自身的移动速度来确定 T3402定时器的值，而不使用默认时长。当移动速度达到第一值时，移动终端确定的T3402定时器的值小于默认时长，即降低T3402定时器的值。
在本申请实施例中，可以将T3402定时器的默认时长称为第一默认时长。该第一默认时长可以为TS 24.301中定义的12分钟，也可以为其他值，本申请实施例对此不作限制。
移动终端启动T3402定时器并禁用E-UTRA能力(disablethe E-UTRA capability)后，如果以较快的速度移动，则可能进入到LTE网络状况良好的覆盖区域。在本申请实施例提供的方法中，由于移动终端在自身确定的T3402定时器超时后即可重新接入LTE网络，无需等待默认时长，移动终端在进入网络状况良好的覆盖区域后能够快速地接入LTE网络，提高接入LTE网络的效率，为用户提供良好的移动终端使用体验。
在本申请以下实施例中，移动终端连续接入LTE网络失败的场景具体可包括：场景1.移动终端附着(attach)失败，且尝试附着(attach)的次数达到了预设值；场景2.移动终端TAU失败，且尝试TAU的次数达到了预设值。后续方法实施例将对该两个场景进行详细的描述，在此不赘述。
在本申请以下实施例中，移动终端禁用E-UTRA能力(disablethe E-UTRA capability)是指移动终端不再在4G频段上工作，不搜索4G频段上的任何信号。移动终端禁用E-UTRA能力也可以看作该移动终端禁用LTE网络。
为了更好地描述本申请实施例提供的移动终端接入LTE网络的方法，下面首先介绍本申请实施例提供的移动通信系统。
参考图1，图1示出了本申请实施例提供的移动通信系统10的架构。
如图1所示，移动通信系统10为LTE系统。移动通信系统10可包括：移动终端100，和，4G系统(evolved packet system，EPS)。
移动终端100可包括智能手机(例如搭载Android系统或iOS系统的手机等)、可穿戴设备(例如智能手表、智能手环等)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(MID，mobile internet device)或其他可移动的便携式设备。移动终端100也可称为用户设备(user equipment，UE)。
移动终端100提供4G无线通信的解决方案。在一些实施例中，移动终端100也可以提供包括2G/3G/5G无线通信的解决方案。也就是说，移动终端100支持4G(即LTE)，还可以支持2G、3G、5G甚至未来发展出的移动通信解决方案等。
移动终端100中存储有用户信息。该用户信息可包括IMSI，可以被存储在移动终端100的客户识别模块(subscriber identity module，SIM)卡中。移动终端100可以使用该用户信息作为身份标识连接到网络设备200，从而接入LTE网络，使用LTE网络分配的资源进行移动业务，例如使用基于网络互连协议多媒体子系统(internet protocol multimedia subsystem，IMS)的长期演进语音方案(voice on long term evolution，VoLTE)发起呼叫、获取视频资源、获取音频资源等等。
移动终端100可以通过附着(attach)或TAU来接入LTE网络。附着(attach)、TAU的详细过程可参考后续方法实施例中的相关描述。
在本申请实施例中，移动终端100可以在连续接入LTE网络失败时，启动T3402定时 器并禁用E-UTRA能力，在T3402定时器超时后，移动终端100重新尝试接入LTE网络。其中，T3402定时器的值是移动终端100根据自身的移动速度来确定的。当移动速度达到第一值时，移动终端确定的T3402定时器的值小于默认时长12分钟。这样可以保证移动终端100进入LTE网络状况良好的覆盖区域后快速地接入LTE网络，提高接入LTE网络的效率，为用户提供良好的移动终端使用体验。
EPS可包括一个或多个网络设备200。网络设备200用于在移动终端100接入LTE网络后，为移动终端100分配网络资源，以支持移动终端100的移动业务。网络设备200例如可包括4G基站、4G核心网(evolved packet core，EPC)设备等等。4G基站连接至EPC设备。4G基站的数量、EPC设备均可以为一个或多个。其中：
4G基站可以是演进型基站(evolved Node B，eNodeB)、接入点(access point，AP)、传输节点(transmit/receive point，TRP)、中心单元(central unit，CU)或其他网络实体。
EPC设备可包括以下网元：移动性管理实体(mobility management entity，MME)、服务网关(serving gateway，SGW)、分组数据网络网关(packet data network gateway，PGW)、归属签约用户服务器(home subscriber server，HSS)和应用服务器等等。MME的主要用于为移动终端100提供接入控制、移动性管理、附着与去附着、会话管理(例如承载的建立、修改和释放)等等。
一个4G基站的信号覆盖范围可以分为多个跟踪区(tracking area，TA)，或者，多个4G基站的信号覆盖范围组成一个TA。移动终端100需要注册到一个或多个TA，以便于EPC设备进行寻呼管理。具体的，EPC设备可以在移动终端100注册到的TA内寻呼终端，而不需要在整个网络中寻找。空闲状态的终端在移动过程中如果移动出了当前注册的TA，则发起TAU流程，告知EPC设备当前所在的新的TA。
参考图2A，图2A示例性示出了本申请实施例提供的移动终端100的结构示意图。
移动终端100可以包括：处理器110，外部存储器接口120，内部存储器121，通用串行总线(universal serial bus，USB)接口130，充电管理模块140，电源管理模块141，电池142，天线1，天线2，移动通信模块150，无线通信模块160，音频模块170，扬声器170A，受话器170B，麦克风170C，耳机接口170D，传感器模块180，按键190，马达191，指示器192，摄像头193，显示屏194，以及用户标识模块(subscriber identification module，SIM)卡接口195等。其中传感器模块180可以包括压力传感器180A，陀螺仪传感器180B，气压传感器180C，磁传感器180D，加速度传感器180E，距离传感器180F，接近光传感器180G，指纹传感器180H，温度传感器180J，触摸传感器180K，环境光传感器180L，骨传导传感器180M等。
可以理解的是，本申请实施例示意的结构并不构成对移动终端100的具体限定。在本申请另一些实施例中，移动终端100可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
处理器110可以包括一个或多个处理单元，例如：处理器110可以包括应用处理器(application processor，AP)，调制解调处理器，图形处理器(graphics processing unit，GPU)， 图像信号处理器(image signal processor，ISP)，控制器，存储器，视频编解码器，数字信号处理器(digital signal processor，DSP)，基带处理器，和/或神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。
其中，控制器可以是移动终端100的神经中枢和指挥中心。控制器可以根据指令操作码和时序信号，产生操作控制信号，完成取指令和执行指令的控制。
处理器110中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器110中的存储器为高速缓冲存储器。该存储器可以保存处理器110刚用过或循环使用的指令或数据。如果处理器110需要再次使用该指令或数据，可从所述存储器中直接调用。避免了重复存取，减少了处理器110的等待时间，因而提高了系统的效率。
移动终端100的无线通信功能可以通过天线1，天线2，移动通信模块150，无线通信模块160，调制解调处理器以及基带处理器等实现。
天线1和天线2用于发射和接收电磁波信号。移动终端100中的每个天线可用于覆盖单个或多个通信频带。例如，天线1可覆盖4G通信频带，天线2可覆盖2G/3G/5G通信频带。不同的天线还可以复用，以提高天线的利用率。例如：可以将天线1复用为无线局域网的分集天线。在另外一些实施例中，天线可以和调谐开关结合使用。
移动通信模块150提供应用在移动终端100上的4G无线通信的解决方案。在一些实施例中，移动通信模块150也可以提供应用在移动终端100上的包括2G/3G/5G无线通信的解决方案。移动通信模块150可以包括至少一个滤波器，开关，功率放大器，低噪声放大器(low noise amplifier，LNA)等。移动通信模块150可以由天线1接收电磁波，并对接收的电磁波进行滤波，放大等处理，传送至调制解调处理器进行解调。移动通信模块150还可以对经调制解调处理器调制后的信号放大，经天线1转为电磁波辐射出去。在一些实施例中，移动通信模块150的至少部分功能模块可以被设置于处理器110中。在一些实施例中，移动通信模块150的至少部分功能模块可以与处理器110的至少部分模块被设置在同一个器件中。
调制解调处理器可以包括调制器和解调器。其中，调制器用于将待发送的低频基带信号调制成中高频信号。解调器用于将接收的电磁波信号解调为低频基带信号。随后解调器将解调得到的低频基带信号传送至基带处理器处理。低频基带信号经基带处理器处理后，被传递给应用处理器。应用处理器通过音频设备(不限于扬声器170A，受话器170B等)输出声音信号，或通过显示屏194显示图像或视频。在一些实施例中，调制解调处理器可以是独立的器件。在另一些实施例中，调制解调处理器可以独立于处理器110，与移动通信模块150或其他功能模块设置在同一个器件中。
无线通信模块160可以提供应用在移动终端100上的包括无线局域网(wireless local area networks，WLAN)(如无线保真(wireless fidelity，Wi-Fi)网络)，蓝牙(bl移动终端tooth，BT)，全球导航卫星系统(global navigation satellite system，GNSS)，调频(freq移动终端ncy modulation，FM)，近距离无线通信技术(near field communication，NFC)，红外技术(infrared，IR)等无线通信的解决方案。无线通信模块160可以是集成至少一个通信处理模块的一个或多个器件。无线通信模块160经由天线2接收电磁波，将电磁波信号解调以及滤波处理， 将处理后的信号发送到处理器110。无线通信模块160还可以从处理器110接收待发送的信号，对其进行调频，放大，经天线2转为电磁波辐射出去。
在一些实施例中，移动终端100的天线1和移动通信模块150耦合，天线2和无线通信模块160耦合，使得移动终端100可以通过无线通信技术与网络以及其他设备通信。所述无线通信技术可以包括全球移动通讯系统(global system for mobile communications，GSM)，通用分组无线服务(general packet radio service，GPRS)，码分多址接入(code division multiple access，CDMA)，宽带码分多址(wideband code division multiple access，WCDMA)，时分码分多址(time-division code division multiple access，TD-SCDMA)，长期演进(long term evolution，LTE)，BT，GNSS，WLAN，NFC，FM，和/或IR技术等。所述GNSS可以包括全球卫星定位系统(global positioning system，GPS)，全球导航卫星系统(global navigation satellite system，GLONASS)，北斗卫星导航系统(beidou navigation satellite system，BDS)，准天顶卫星系统(quasi-zenith satellite system，QZSS)，伽利略卫星导航系统(galileo satellite navigation system)和/或星基增强系统(satellite based augmentation systems，SBAS)。
移动终端100通过GPU，显示屏194，以及应用处理器等实现显示功能。GPU为图像处理的微处理器，连接显示屏194和应用处理器。GPU用于执行数学和几何计算，用于图形渲染。处理器110可包括一个或多个GPU，其执行程序指令以生成或改变显示信息。
显示屏194用于显示图像，视频等。显示屏194包括显示面板。显示面板可以采用液晶显示屏(liquid crystal display，LCD)，有机发光二极管(organic light-emitting diode，OLED)，有源矩阵有机发光二极体或主动矩阵有机发光二极体(active-matrix organic light emitting diode的，AMOLED)，柔性发光二极管(flex light-emitting diode，FLED)，Miniled，MicroLed，Micro-oLed，量子点发光二极管(quantum dot light emitting diodes，QLED)等。在一些实施例中，移动终端100可以包括1个或N个显示屏194，N为大于1的正整数。
内部存储器121可以用于存储计算机可执行程序代码，所述可执行程序代码包括指令。处理器110通过运行存储在内部存储器121的指令，从而执行移动终端100的各种功能应用以及数据处理。内部存储器121可以包括存储程序区和存储数据区。其中，存储程序区可存储操作系统，至少一个功能所需的应用程序(比如声音播放功能，图像播放功能等)等。存储数据区可存储移动终端100使用过程中所创建的数据(比如音频数据，电话本等)等。此外，内部存储器121可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件，闪存器件，通用闪存存储器(universal flash storage，UFS)等。
压力传感器180A用于感受压力信号，可以将压力信号转换成电信号。在一些实施例中，压力传感器180A可以设置于显示屏194。压力传感器180A的种类很多，如电阻式压力传感器，电感式压力传感器，电容式压力传感器等。电容式压力传感器可以是包括至少两个具有导电材料的平行板。当有力作用于压力传感器180A，电极之间的电容改变。移动终端100根据电容的变化确定压力的强度。当有触摸操作作用于显示屏194，移动终端100根据压力传感器180A检测所述触摸操作强度。移动终端100也可以根据压力传感器180A的检测信号计算触摸的位置。在一些实施例中，作用于相同触摸位置，但不同触摸操作强度的触摸操作，可以对应不同的操作指令。例如：当有触摸操作强度小于第一压力阈值的触摸操作作用于短消息应用图标时，执行查看短消息的指令。当有触摸操作强度大于或等 于第一压力阈值的触摸操作作用于短消息应用图标时，执行新建短消息的指令。
陀螺仪传感器180B可以用于确定移动终端100的运动姿态。在一些实施例中，可以通过陀螺仪传感器180B确定移动终端100围绕三个轴(即，x，y和z轴)的角速度。
加速度传感器180E可检测移动终端100在各个方向上(一般为三轴)加速度的大小。当移动终端100静止时可检测出重力的大小及方向。还可以用于识别移动终端姿态，应用于横竖屏切换，计步器等应用。
距离传感器180F，用于测量距离。移动终端100可以通过红外或激光测量距离。
触摸传感器180K，也称“触控面板”。触摸传感器180K可以设置于显示屏194，由触摸传感器180K与显示屏194组成触摸屏，也称“触控屏”。触摸传感器180K用于检测作用于其上或附近的触摸操作。触摸传感器可以将检测到的触摸操作传递给应用处理器，以确定触摸事件类型。可以通过显示屏194提供与触摸操作相关的视觉输出。在另一些实施例中，触摸传感器180K也可以设置于移动终端100的表面，与显示屏194所处的位置不同。
SIM卡接口195用于连接SIM卡。SIM卡可以通过插入SIM卡接口195，或从SIM卡接口195拔出，实现和移动终端100的接触和分离。移动终端100可以支持1个或N个SIM卡接口，N为大于1的正整数。SIM卡接口195可以支持Nano SIM卡，Micro SIM卡，SIM卡等。同一个SIM卡接口195可以同时插入多张卡。
在本申请的一些实施例中，无线通信模块160可用于通过GNSS例如GPS、BDS、GLONASS、QZSS或SBAS获得移动终端100的实时位置信息。处理器110可根据移动终端100在任意两个时间点的实时位置信息，确定移动终端100在该两个时间点之间的移动距离，并计算移动速度。
在本申请的一些实施例中，处理器110还可以利用无线通信模块160使用GNSS监测到的信号，通过原始多普勒观测值或由载波相位中心差分所获得的多普勒观测值，来计算移动速度。
在本申请的一些实施例中，处理器110可利用加速度传感器180E的测量值，对测得的加速度进行积分得到移动速度。
在本申请的一些实施例中，当移动终端100位于公共交通工具(例如高铁、动车、飞机)上时，无线通信模块160可通过短距离通信技术例如BT、Wi-Fi、NFC、光保真技术(light fidelity，LiFi)等与公共交通工具建立短距离通信连接，然后基于该短距离通信连接获取公共交通工具共享的速度信息。处理器110可用于解析无线通信模块160基于短距离通信连接接收到的信号，从而确定移动终端100的移动速度。
在本申请实施例中，处理器201可用于在移动终端100连续接入LTE网络失败时，根据移动终端100的移动速度确定T3402定时器的值，并启动该T3402定时器。当移动速度达到第一值时，处理器201确定的T3402定时器的值小于默认时长12分钟，即降低T3402定时器的值。
在本申请实施例中，移动通信模块150可用于在T3402定时器启动后，禁用E-UTRA能力。移动通信模块150还用于在T3402定时器超时后，恢复E-UTRA能力并重新尝试接入LTE网络。
移动终端100的软件系统可以采用分层架构，事件驱动架构，微核架构，微服务架构，或云架构。本申请实施例以分层架构的Android系统为例，示例性说明移动终端100的软件结构。
图2B是本申请实施例的移动终端100的软件结构框图。
分层架构将软件分成若干个层，每一层都有清晰的角色和分工。层与层之间通过软件接口通信。在一些实施例中，将Android系统分为四层，从上至下分别为应用程序层，应用程序框架层，安卓运行时(Android runtime)和系统库，以及内核层。
应用程序层可以包括一系列应用程序包。
如图2B所示，应用程序包可以包括相机，图库，日历，通话，地图，导航，WLAN，蓝牙，音乐，视频，短信息等应用程序。
应用程序框架层为应用程序层的应用程序提供应用编程接口(application programming interface，API)和编程框架。应用程序框架层包括一些预先定义的函数。
如图2B所示，应用程序框架层可以包括窗口管理器，内容提供器，视图系统，电话管理器，资源管理器，通知管理器等。
窗口管理器用于管理窗口程序。窗口管理器可以获取显示屏大小，判断是否有状态栏，锁定屏幕，截取屏幕等。
内容提供器用来存放和获取数据，并使这些数据可以被应用程序访问。所述数据可以包括视频，图像，音频，拨打和接听的电话，浏览历史和书签，电话簿等。
视图系统包括可视控件，例如显示文字的控件，显示图片的控件等。视图系统可用于构建应用程序。显示界面可以由一个或多个视图组成的。例如，包括短信通知图标的显示界面，可以包括显示文字的视图以及显示图片的视图。
电话管理器用于提供移动终端100的通信功能。例如通话状态的管理(包括接通，挂断等)。
资源管理器为应用程序提供各种资源，比如本地化字符串，图标，图片，布局文件，视频文件等等。
通知管理器使应用程序可以在状态栏中显示通知信息，可以用于传达告知类型的消息，可以短暂停留后自动消失，无需用户交互。比如通知管理器被用于告知下载完成，消息提醒等。通知管理器还可以是以图表或者滚动条文本形式出现在系统顶部状态栏的通知，例如后台运行的应用程序的通知，还可以是以对话窗口形式出现在屏幕上的通知。例如在状态栏提示文本信息，发出提示音，移动终端振动，指示灯闪烁等。
Android Runtime包括核心库和虚拟机。Android runtime负责安卓系统的调度和管理。
核心库包含两部分：一部分是java语言需要调用的功能函数，另一部分是安卓的核心库。
应用程序层和应用程序框架层运行在虚拟机中。虚拟机将应用程序层和应用程序框架层的java文件执行为二进制文件。虚拟机用于执行对象生命周期的管理，堆栈管理，线程管理，安全和异常的管理，以及垃圾回收等功能。
系统库可以包括多个功能模块。例如：表面管理器(surface manager)，媒体库(Media Libraries)，三维图形处理库(例如：OpenGL ES)，2D图形引擎(例如：SGL)等。
表面管理器用于对显示子系统进行管理，并且为多个应用程序提供了2D和3D图层的融合。
媒体库支持多种常用的音频，视频格式回放和录制，以及静态图像文件等。媒体库可以支持多种音视频编码格式，例如:MPEG4，H.264，MP3，AAC，AMR，JPG，PNG等。
三维图形处理库用于实现三维图形绘图，图像渲染，合成，和图层处理等。
2D图形引擎是2D绘图的绘图引擎。
内核层是硬件和软件之间的层。内核层至少包含显示驱动，摄像头驱动，音频驱动，传感器驱动。
参考图3，图3为本申请实施例提供的网络设备200的结构示意图。图3所示的网络设备200可以是图1所示通信系统10中的MME或eNodeB，本申请实施例对此不作限制。
如图3所示，网络设备200可包括：一个或多个处理器201、存储器202、通信接口203、发射器205、接收器206、耦合器207和天线208。这些部件可通过总线204或者其他方式连接，图3以通过总线连接为例。其中：
通信接口203可用于网络设备200与其他通信设备，例如移动终端或其他网络设备，进行通信。具体的，通信接口203可以是LTE通信接口。不限于无线通信接口，网络设备200还可以配置有有线的通信接口203来支持有线通信，例如一个网络设备200与其他网络设备200之间的回程链接可以是有线通信连接。
在本申请的一些实施例中，发射器205和接收器206可看作一个无线调制解调器。发射器205可用于对处理器201输出的信号进行发射处理。接收器206可用于接收信号。在网络设备200中，发射器205和接收器206的数量均可以是一个或者多个。天线208可用于将传输线中的电磁能转换成自由空间中的电磁波，或者将自由空间中的电磁波转换成传输线中的电磁能。耦合器207可用于将移动通信号分成多路，分配给多个的接收器206。可理解的，网络设备的天线208可以实现为大规模天线阵列。
存储器202与处理器201耦合，用于存储各种软件程序和/或多组指令。具体的，存储器202可包括高速随机存取的存储器，并且也可包括非易失性存储器，例如一个或多个磁盘存储设备、闪存设备或其他非易失性固态存储设备。
存储器202可以存储操作系统(下述简称系统)，例如uCOS、VxWorks、RTLinux等嵌入式操作系统。存储器202还可以存储网络通信程序，该网络通信程序可用于与一个或多个附加设备，一个或多个移动设备，一个或多个网络设备进行通信。
本申请实施例中，处理器201可用于读取和执行计算机可读指令。具体的，处理器201可用于调用存储于存储器202中的程序，例如本申请的一个或多个实施例提供的移动终端接入LTE网络的方法在网络设备200侧的实现程序，并执行该程序包含的指令。
需要说明的，图3所示的网络设备200仅仅是本申请实施例的一种实现方式，实际应用中，网络设备200还可以包括更多或更少的部件，这里不作限制。
下面结合图1所示的移动通信系统10、图2A及图2B所示的移动终端100和图3所示的网络设备200，详细描述本申请实施例提供的移动终端接入LTE网络的方法。
以下分2个实施例来描述本申请实施例提供的移动终端接入LTE网络的方法。
(一)实施例1
在实施例1中，移动终端100在附着(attach)失败，且尝试附着(attach)的次数达到了阈值时，启动T3402定时器，并禁用E-UTRA能力(disablethe E-UTRA capability)。在该T3402定时器超时后，移动终端100重新尝试接入LTE网络。该T3402定时器的值由移动终端100根据自身的移动速度来确定。
进入实施例1之前，首先介绍实施例1涉及的附着(attach)流程。
附着(attach)是移动终端100为了获取服务而向EPC注册、由EPC为移动终端100分配互联网协议(internet protocol，IP)地址、建立连接、建立默认承载、产生安全上下文的一个过程。移动终端100可以在开机后发起附着(attach)，也可以在发生漫游时发起附着(attach)。可理解的，移动终端100发起附着(attach)的时机及目的均可参考TS24.301中的相关内容，这里不再赘述。
参考图4，图4示出了移动终端100的附着(attach)流程。该流程可参考3GPP制定的TS24.301 5.5.1中定义的相关内容。图4中的网络设备200可以为MME，图4中MME和移动终端100之间传输的消息均通过eNodeB透传。
如图4所示，移动终端100首先向网络设备200发送附着请求(attach request)，并同时启动T3410定时器。T3402定时器的值可参考TS24.301中的规定，例如可以为15秒。
一种可能的情况是，网络设备200接收到附着请求后，向移动终端100发送附着接受消息(attach accept)；移动终端100接收到附着接受消息时，停止T3410定时器，之后回复附着完成(accept complete)消息，从而成功附着。
另一种可能的情况是，网络设备200接收到附着请求后，向移动终端100发送附着拒绝消息(attach reject)；移动终端100接收到附着拒绝消息时，停止T3410定时器，附着失败。
移动终端100附着(attach)失败的原因可能有多种，本申请实施例不作限制。例如可包括网络拥塞如当前附着到网络设备200的设备数量过多、网络设备200的信号差、移动终端100和网络设备200之间的干扰大、移动终端100不支持当前所在的公共陆地移动网络(public land mobile network，PLMN)、移动终端100当前所在的PLMN不支持EPS服务、移动终端100请求的服务选项未在当前所在PLMN中配置等等。
在实施例1中，移动终端100可以在以下任意一种情况下判定当前附着(attach)失败：
1.移动终端100发送附着请求(attach request)后，接收到附着拒绝(attach reject)消息。
2.移动终端100发送附着请求(attach request)后的T3410定时器运行期间内未接收到网络设备200的任何响应消息。
参考图5，图5示出了实施例1提供的移动终端接入LTE网络的方法的流程。
如图5所示，该方法可包括如下步骤：
S110，移动终端100附着(attach)失败，且尝试附着(attach)的次数达到阈值。
移动终端100附着(attach)失败的具体情况可参考图4的相关描述，例如可包括移动 终端100接收到附着拒绝(attach reject)消息，或者在发送附着请求(attach request)后的T3410定时器运行期间都未接收到网络设备200的任何响应消息。
移动终端100尝试附着(attach)的次数可以通过附着尝试计数器(attach attempt counter)的值来确定。具体的，移动终端100可以维持附着尝试计数器。附着尝试计数器用于指示移动终端100尝试附着但被拒绝的次数。附着尝试计数器的最大值即为阈值。
可理解的，尝试计数器的重置以及加1的情况均可参考TS24.301 5.5.1中的内容。后续将简单介绍附着尝试计数器的重置以及加1的情况，这里先不赘述。
阈值可以预先设定，例如可以为5。本申请实施例对阈值不作限制。
S110即移动终端100附着失败的次数达到阈值。
在一个具体的示例中，S110可以为：移动设备100先后发送n次附着请求(attach request)，其中每一次发送附着请求后的T3410定时器运行期间，都没有收到网络设备200的响应消息或者都接收到网络设备200发送的附着拒绝消息。其中，n取阈值。一种可能是，移动设备100发送附着请求(attach request)后启动T3410定时器，若在T3410定时器运行期间内未接收到网络设备200的响应消息，则在该T3410定时器超时后，释放和网络设备200之间的RRC连接，然后再过一段时间(例如10秒)再发送下一次附着请求(attach request)。另一种可能是，移动终端100发送附着请求(attach request)后启动T3410定时器，若在T3410定时器运行期间接收到附着拒绝(attach reject)消息，则释放和网络设备200之间的RRC连接，然后再过一段时间(例如10秒)再发送下一次附着请求(attach request)。
在本申请实施例中，S110中移动终端100阈值次数的附着失败可能是针对同一小区的，也可能是针对不同小区的，这里不作限制。S110中移动终端100可以处于静止状态，也可以处于移动状态，这里不作限制。
在一个具体的实施例中，S110中移动终端100可以在静止状态下，附着到同一个小区失败的次数达到阈值。
S120，移动终端100启动T3402定时器，并禁用E-UTRA能力(disablethe E-UTRA capability)，T3402定时器的时长由移动终端100的移动速度确定。
移动终端100可以启动T3402定时器，并同时禁用E-UTRA能力。在该T3402定时器超时后即经过T3402定时器的时长后，移动终端100恢复E-UTRA能力。
在具体的例子中，按照TS24.301 10.2中的定义，CAUSE OF START T3402：At attach failure and the attempt counter is equal to 5，即移动设备在附着失败且尝试附着的次数达到5次时启动T3402定时器。
在本申请实施例中，T3402定时器的时长由移动终端100根据自身的移动速度来确定。移动终端100可以在S110后检测自身的移动速度，也可以在开机后周期性地检测自身的移动速度，本申请实施例对此不作限制。在本申请实施例中，移动终端100可通过以下几种方式来检测自身的移动速度：
(1)移动终端100可用于通过GNSS例如GPS、BDS、GLONASS、QZSS或SBAS获得移动终端100的实时位置信息，然后根据移动终端100在任意两个时间点的实时位置信息，确定移动终端100在该两个时间点之间的移动距离，并计算移动速度。
(2)移动终端100还可以使用GNSS监测到的信号，通过原始多普勒观测值或由载波 相位中心差分所获得的多普勒观测值，来计算移动速度。
(3)移动终端100可测量加速度值，并对测得的加速度进行积分得到移动速度。
(4)当移动终端100位于公共交通工具(例如高铁、动车、飞机)上时，移动终端100可通过短距离通信技术例如BT、Wi-Fi、NFC、光保真技术(light fidelity，LiFi)等与公共交通工具建立短距离通信连接，然后基于该短距离通信连接获取公共交通工具共享的速度信息。
在本申请实施例1中，移动终端100根据自身的移动速度来确定T3402定时器的时长。下面分两种不同的情况来说明移动终端100如何确定该T3402定时器的时长：
(1)当移动终端100的移动速度达到第一值时，移动终端100确定的T3402定时器的时长小于T3402定时器的默认时长。这里，第一值可以预先设置，例如可以为200km/h，本申请实施例对此不作限制。
下面介绍几种当移动终端100的移动速度达到第一值时，移动终端100确定T3402定时器的时长的方式：
a，当移动终端100的移动速度等于第一值时，T3402定时器的时长等于第一时长；当移动终端10的移动速度等于第二值时，T3402定时器的时长等于第二时长。其中，第二值大于第一值，第二时长小于第一时长，第一时长和第二时长均小于T3402定时器的默认时长。也就是说，移动速度越快，移动终端100确定的T3402定时器的时长越小。
在一些实施例中，移动速度不同时，移动终端100确定的T3402定时器的时长不同。
在另一些实施例中，移动速度所在区间不同时，移动终端确定的T3402定时器的时长不同。具体的，移动终端100可以将大于及等于第一值的移动速度划分为多个互不重叠的区间，每一个区间均对应一个时长，区间内移动速度越大，其对应的时长越小。区间的划分以及每个区间对应的时长可以预设，本申请实施例不作限制。示例性地，移动终端100可以将大于200km/h的移动速度划分为以下几个区间：200km/h≤移动速度<220km/h、220km/h≤移动速度<250km/h、250km/h≤移动速度<300km/h；几个区间分别对应的时长可以为：10分钟、8分钟、6分钟。这样，在移动终端100的移动速度达到第一值时，移动终端100确定的T3402定时器的时长为，当前移动终端100的移动速度所在区间对应的时长。
b，当移动终端100的移动速度达到第一值时，不管该移动速度具体是多少，该T3402定时器的时长的取值均为固定的第二默认时长。该第二默认时长小于T3402定时器的默认时长。该第二默认时长可以预先设置例如可以设置为8分钟，这里不作限制。
(2)当移动终端100的移动速度小于第一值时，移动终端100确定的T3402定时器的时长可保持默认时长。
在本申请实施例中，移动终端100禁用E-UTRA能力(disablethe E-UTRA capability)是指移动终端不再在4G频段上工作，不搜索4G频段上的任何信号。移动终端禁用E-UTRA能力也可以看作该移动终端禁用LTE网络。
可理解的，移动终端100禁用E-UTRA能力后，还可以在其他频段上工作，搜索其他频段上的信号并接入其他制式的网络。例如，移动终端100还可以搜索5G/3G/2G频段上的信号，并接入5G/3G/2G网络以及未来发展的网络。在一些实施例中，移动终端100可以预先设置优先级，按照优先级的先后顺序接入其他制式的网络，例如移动终端100可优 先接入5G网络，其次是3G网络，最后是2G网络。
不限于S120中移动终端100在T3402定时器运行期间禁用E-UTRA能力，在其他一些实施例中，移动终端100可以在T3402定时器运行期间仅禁止搜索S110中附着失败的小区，但还可以搜索LTE制式下的其他小区。这样可以增加移动终端100可搜索的小区范围，能够进一步提升移动终端100接入LTE网络的效率。在一个具体的实例中，若S110中阈值次数的附着失败均是针对同一小区的，则移动终端100可以在T3402定时器运行期间禁止搜索该小区。
S130，在T3402定时器超时后，移动终端100重新搜索LTE网络，并发起附着(attach)。
即，经过T3420的时长后，移动终端100可恢复E-UTRA能力，并重新搜索LTE网络，发起附着(attach)以接入LTE网络。
S130是移动终端100搜索LTE网络并发起附着的流程。该流程具体可分为以下几个步骤：
1.选择小区。
移动终端100先搜索非接入层(non-access stratum，NAS)请求的PLMN，扫描E-UTRA频带(即4G频带)中的所有射频RF信道以找到PLMN，搜索信号最强的小区并读取系统信息以确定PLMN，确认小区选择标准都满足于S准则，则进一步驻留在选择的小区上。移动终端100驻留到小区，即移动终端100搜索到LTE网络。
2.注册到小区。
移动终端100先执行随机接入过程，在成功建立RRC连接后，发起附着(attach)请求进行注册。注册成功后即成功接入LTE网络，之后可以使用网络侧提供的各类服务，例如数据服务、语音服务等等。
简单地说，移动终端100可以在T3402定时器超时后，可以重新搜索LTE网络，即搜索4G基站发射的4G信号。在搜索到LTE网络后，可向该对应的网络设备200发起附着(attach)。移动终端100发起附着(attach)的流程可参考图4所示的流程。例如，移动终端100可向网络设备200再次发送附着(attach)请求。
可理解的，当移动终端100快速移动的情况下，移动终端100执行S110和S130时所处的位置可能有很大变化，因此，S110和S130中移动终端100附着(attach)时交互的网络设备200可能是同一个网络设备，也可能不是同一个网络设备。并且，S110中移动终端100几次尝试附着(attach)且失败时，和该移动终端100交互的网络设备可能是一个，也可能有多个，本申请实施例对此不作限制。在本申请实施例中，可以将S110中和移动终端100附着(attach)时交互的网络设备称为第二网络设备，将S130中和移动终端100附着(attach)时交互的网络设备称为第一网络设备。
当移动终端100快速移动的情况下，移动终端100执行S130时可能已进入到LTE网络状况良好的覆盖区域，这样，执行S130后，移动终端100可以接收到网络设备200发送的附着接受消息(attach accept)，并可以向网络设备200回复附着完成(accept complete)消息，从而成功附着，即成功接入LTE网络。
通过实施例1提供的技术方案，移动终端100在多次附着(attach)失败后，如果移动到LTE网络状况良好的覆盖区域，可以在自身确定的T3402定时器超时后重新接入LTE网 络，无需等待默认时长12分钟。即移动终端100可以快速地接入LTE网络，提高了接入LTE网络的效率，可以为用户提供良好的移动终端使用体验。
下面简单介绍附着尝试计数器的重置以及加1的情况。
移动终端100可以在以下几种情况中将附着尝试计数器重置为0：
1.移动终端100开机；
2.用户全球识别卡(universal subscriber identity module，USIM)插入；
3.附着(attach)成功；
4.进入新的TA；
5.T3402定时器超时；
6.启动T3346定时器；
7.选择了新的PLMN；
8.接收到附着拒绝消息(attach reject)，且携带原因为#11、#12、#13、#14、#15、#25或#35；
9.网络侧发起去附着(detach)，且携带原因为#11、#12、#13、#14、#15或#25。
根据TS24.301 5.5.1.2.6中的如下内容：For the cases b,c,d,l when the"Extended wait time"is ignored,and la when the"Extended wait time CP data"is ignored,if the attach request is neither for emergency bearer services nor for initiating a PDN connection for emergency bearer services with attach type not set to"EPS emergency attach",the attach attempt counter shall be incremented,unless it was already set to 5.
b)Lower layer failure or release of the NAS signalling connection without"Extended wait time"and without"Extended wait time CP data"received from lower layers before the ATTACH ACCEPT or ATTACH REJECT message is received
The attach procedure shall be aborted,and the UE shall proceed as described below.
c)T3410 timeout
The UE shall abort the attach procedure and proceed as described below.The NAS signalling connection,if any,shall be released locally.
d)ATTACH REJECT,other EMM cause values than those treated in subclause 5.5.1.2.5,and cases of EMM cause values#22,#25and#31,if considered as abnormal cases according to subclause 5.5.1.2.5.
l)"Extended wait time"from the lower layers
If the ATTACH REQUEST message contained the low priority indicator set to"MS is configured for NAS signalling low priority",the UE shall start timer T3346with the"Extended wait time"value and reset the attach attempt counter.
If the ATTACH REQUEST message did not contain the low priority indicator set to"MS is configured for NAS signalling low priority",the UE is operating in NB-S1mode and the UE is not a UE configured to use AC11–15in selected PLMN,then the UE shall start timer T3346 with the"Extended wait time"value and reset the attach attempt counter.
In other cases the UE shall ignore the"Extended wait time".
The UE shall abort the attach procedure,stay in the current serving cell,change the state to EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH and apply the normal cell reselection process.
The UE shall proceed as described below.
la)"Extended wait time CP data"from the lower layers
If the UE is operating in NB-S1mode,the UE shall start the timer T3346 with the"Extended wait time CP data"value and reset the attach attempt counter.
In other cases the UE shall ignore the"Extended wait time CP data".
The UE shall abort the attach procedure,stay in the current serving cell,change the state to EMM-DEREGISTERED.ATTEMPTING-TO-ATTACH and apply the normal cell reselection process.
The UE shall proceed as described below.
移动终端100(即UE)可以在以下几种情况中将附着尝试计数器的值加1：
对于情况b，c，d，l，如果忽略“扩展等待时间”，而对于la，则忽略“扩展等待时间CP数据”，如果附着请求既不是针对紧急承载服务，也不是针对发起对于未将附着类型设置为“EPS紧急附着”的紧急承载服务的PDN连接，若附着尝试计数器的值小于5，则该附着尝试计数器的值加1。其中：
情况b是指，较低层故障或NAS信令连接的释放时，移动终端100在收到附着接受(attach accept)消息或附着拒绝(attach reject)消息之前，没有从下层收到“延长的等待时间”和“延长的等待时间CP数据”；附着过程将被中止，并且移动终端100将如下所述进行。
情况c是指，T3410超时。移动终端100将中止附着过程，并如下所述进行。NAS信令连接(如有)应在本地释放。
情况d是指，附着拒绝，除5.5.1.2.5中所述之外，其他EMM的原因值；如果根据5.5.1.2.5条款被视为异常情况，则EMM的情况导致#22，#25和#31。
情况l是指，较低层的“延长的等待时间”。如果附着拒绝(attach reject)消息包含设置为“MS已配置用于NAS信令低优先级”的低优先级指示符，则移动终端100应使用“扩展等待时间”值启动T3346，并重置连接尝试计数器。如果附着请求不包含设置为“MS已配置用于NAS信令低优先级”的低优先级指示符，则表明该移动终端100正在NB-S1模式下运行，并且该移动终端100不是在选定PLMN中配置为使用AC11-15的移动终端100，则移动终端100应使用“扩展的等待时间”值启动T3346，并重置连接尝试计数器。在其他情况下，移动终端100将忽略“延长的等待时间”。移动终端100将中止附着过程，留在当前服务小区中，将状态更改为EMM-DEregister.ATTEMPTING-TO-ATTACH，并应用正常的小区重选过程。移动终端100将如下所述进行。
情况la是指，来自较低层的“扩展等待时间CP数据”。如果移动终端100正在NB-S1模式下操作，则移动终端100应使用“扩展等待时间CP数据”值启动T3346，并重置连接尝试计数器。
在其他情况下，移动终端100将忽略“延长的等待时间CP数据”。移动终端100将中止附着过程，留在当前服务小区中，将状态更改为EMM-DEregister.ATTEMPTING-TO-ATTACH，并应用正常的小区重选过程。移动终端100将如下所述进行。
(二)实施例2
在实施例2中，移动终端100在TAU失败，且尝试TAU的次数达到了阈值时，启动T3402定时器，并禁用E-UTRA能力(disablethe E-UTRA capability)。在该T3402定时器超时后，移动终端100尝试接入LTE网络。该T3402定时器的值由移动终端100根据自身的移动速度来确定。
进入实施例2之前，首先介绍实施例2涉及的TAU流程。
TAU是移动终端100为了实现在网络侧登记TA级位置信息、周期性表明在线、网络侧的负载均衡、更新移动终端100的参数(例如网络能力)等目的的一个过程。移动终端100可以在进入新的TA且该TA不在移动终端100存储的TA列表内、网络侧发起TAU、需要更新参数时发起TAU。可理解的，移动终端100发起TAU的时机及目的均可参考TS24.301中的相关内容，这里不再赘述。
参考图6，图6示出了移动终端100的TAU流程。该流程可参考3GPP制定的TS24.3015.5.3中定义的相关内容。图6中的网络设备200可以为MME，图6中MME和移动终端100之间传输的消息均通过eNodeB透传。
如图6所示，移动终端100首先向网络设备200发送TAU请求(tracking area update request)，并同时启动T3430定时器。T3430定时器的值可参考TS24.301中的规定，例如可以为15秒。
一种可能的情况是，网络设备200接收到TAU请求后，向移动终端100发送TAU接受消息(tracking area update accept)；移动终端100接收到TAU接受消息时，停止T3430定时器。如果移动终端100配置了全球唯一临时UE标识(globally unique temporary UE identity，GUTI)则可以回复TAU完成(tracking area update complete)消息，从而成功附着。
另一种可能的情况是，网络设备200接收到TAU请求后，向移动终端100发送TAU拒绝消息(tracking area update reject)；移动终端100接收到TAU拒绝消息时，停止T3430定时器，TAU失败。
移动终端100TAU失败的原因可能有多种，本申请实施例不作限制。例如可包括网络拥塞如当前附着到网络设备200的设备数量过多、网络设备200的信号差、移动终端100和网络设备200之间的干扰大、移动终端100不支持当前所在的公共陆地移动网络(public land mobile network，PLMN)、移动终端100当前所在的PLMN不支持EPS服务、移动终端100请求的服务选项未在当前所在PLMN中配置等等。
在实施例2中，移动终端100可以在以下任意一种情况下判定当前TAU失败：
1.移动终端100发送TAU请求后，接收到TAU拒绝消息。
2.移动终端100发送TAU请求后的T3430定时器运行期间内未接收到网络设备200 的任何响应消息。
参考图7，图7示出了实施例2提供的移动终端接入LTE网络的方法的流程。
如图7所示，该方法可包括如下步骤：
S210，移动终端100TAU失败，且尝试TAU的次数达到阈值。
移动终端100TAU失败的具体情况可参考图6的相关描述，例如可包括移动终端100接收到TAU拒绝消息，或者在发送TAU请求后的T3430定时器运行期间都未接收到网络设备200的任何响应消息。
移动终端100尝试TAU的次数可以通过TAU尝试计数器(TAU attempt counter)的值来确定。具体的，移动终端100可以维持TAU尝试计数器。TAU尝试计数器用于指示移动终端100尝试TAU但被拒绝的次数。TAU尝试计数器的最大值即为阈值。
可理解的，尝试计数器的重置以及加1的情况均可参考TS24.301 5.5.1中的内容。后续将简单介绍TAU尝试计数器的重置以及加1的情况，这里先不赘述。
阈值可以预先设定，例如可以为5。本申请实施例对阈值不作限制。
S210即移动终端100TAU失败的次数达到阈值。
在一个具体的示例中，S210可以为：移动设备100先后发送n次TAU请求，其中每一次发送TAU请求后的T3430定时器运行期间，都没有收到网络设备200的响应消息或者都接收到网络设备200发送的TAU拒绝消息。其中，n取阈值。一种可能是，移动设备100发送TAU请求后启动T3430定时器，若在T3430定时器运行期间内未接收到网络设备200的响应消息，则在该T3430定时器超时后，释放和网络设备200之间的RRC连接，然后再过一段时间(例如10秒)再发送下一次TAU请求。另一种可能是，移动终端100发送TAU请求后启动T3430定时器，若在T3430定时器运行期间接收到TAU拒绝消息，则释放和网络设备200之间的RRC连接，然后再过一段时间(例如10秒)再发送下一次TAU请求。
在本申请实施例中，S210中移动终端100阈值次数的TAU失败可能是针对同一小区的，也可能是针对不同小区的，这里不作限制。S210中移动终端100可以处于静止状态，也可以处于移动状态，这里不作限制。
在一个具体的实施例中，S210中移动终端100可以在静止状态下，在同一个小区TAU失败的次数达到阈值。
S220，移动终端100启动T3402定时器，并禁用E-UTRA能力(disablethe E-UTRA capability)，T3402定时器的时长由移动终端100的移动速度确定。
移动终端100可以启动T3402定时器，并同时禁用E-UTRA能力。在该T3402定时器超时后即T3402定时器的时长后，移动终端100恢复E-UTRA能力。
在具体的例子中，按照TS24.301 10.2中的定义，CAUSE OF START T3402：At tracking area updating failure and the attempt counter is equal to 5，即移动设备在TAU失败且尝试TAU的次数达到5次时启动T3402定时器。
在本申请实施例中，移动终端100检测自身的移动速度的方式以及时机和实施例1中相同，可参考实施例1中S120的相关描述，在此不赘述。
在本申请实施例2中，移动终端100根据自身的移动速度来确定T3402定时器的时长 的方式和实施例1中相同，可参考实施例1中S120的相关描述，在此不赘述。
在本申请实施例中，移动终端100禁用E-UTRA能力(disablethe E-UTRA capability)是指移动终端不再在4G频段上工作，不搜索4G频段上的任何信号。移动终端禁用E-UTRA能力也可以看作该移动终端禁用LTE网络。
可理解的，移动终端100禁用E-UTRA能力后，还可以在其他频段上工作，搜索其他频段上的信号并接入其他制式的网络。例如，移动终端100还可以搜索5G/3G/2G频段上的信号，并接入5G/3G/2G网络以及未来发展的网络。在一些实施例中，移动终端100可以预先设置优先级，按照优先级的先后顺序接入其他制式的网络，例如移动终端100可优先接入5G网络，其次是3G网络，最后是2G网络。
不限于S220中移动终端100在T3402定时器运行期间禁用E-UTRA能力，在其他一些实施例中，移动终端100可以在T3402定时器运行期间仅禁止搜索S210中TAU失败的小区，但还可以搜索LTE制式下的其他小区。这样可以增加移动终端100可搜索的小区范围，能够进一步提升移动终端100接入LTE网络的效率。在一个具体的实例中，若S210中阈值次数的TAU失败均是针对同一小区的，则移动终端100可以在T3402定时器运行期间禁止搜索该小区。
S230，在T3402定时器的时长后，移动终端100重新搜索LTE网络，并发起附着(attach)。
S230和实施例1中的S130相同，可参考相关描述，这里不再赘述。
简单地说，移动终端100可以在T3402定时器超时后，可以重新搜索LTE网络，即搜索4G基站发射的4G信号。在搜索到LTE网络后，可向该对应的网络设备200发起附着(attach)。移动终端100发起附着(attach)的流程可参考图4所示的流程。例如，移动终端100可向网络设备200再次发送附着(attach)请求。
可理解的，当移动终端100快速移动的情况下，移动终端100执行S210和S230时所处的位置可能有很大变化，因此，S210中移动终端100TAU时和S230中移动终端100附着(attach)时交互的网络设备200可能是同一个网络设备，也可能不是同一个网络设备。并且，S210中移动终端100几次尝试TAU且失败时，和该移动终端100交互的网络设备可能是一个，也可能有多个，本申请实施例对此不作限制。在本申请实施例中，可以将S210中和移动终端100TAU时交互的网络设备称为第二网络设备，将S230中和移动终端100附着(attach)时交互的网络设备称为第一网络设备。
当移动终端100快速移动的情况下，移动终端100执行S230时可能已进入到LTE网络状况良好的覆盖区域，这样，执行S230后，移动终端100可以接收到网络设备200发送的附着接受消息(attach accept)，并可以向网络设备200回复附着完成(accept complete)消息，从而成功附着，即成功接入LTE网络。
通过实施例2提供的技术方案，移动终端100在多次TAU失败后，如果移动到LTE网络状况良好的覆盖区域，可以在自身确定的T3402定时器超时后重新接入LTE网络，无需等待默认时长12分钟。即移动终端100可以快速地接入LTE网络，提高了接入LTE网络的效率，可以为用户提供良好的移动终端使用体验。
下面简单介绍TAU尝试计数器的重置以及加1的情况。
移动终端100可以在以下几种情况中将TAU尝试计数器重置为0：
1.附着(attach)成功；
2.TAU成功；
3.TAU失败，且携带原因为#11、#12、#13、#14、#15、#25或#35；
4.移动终端100选择了一个新的PLMN；
5.移动终端100为EMM-REGISTERED.ATTEMPTING-TO-UPDATE态，且进入了一个新的TA；
6.移动终端100为EMM-REGISTERED.ATTEMPTING-TO-UPDATE态，且启动了T3402；
7.移动终端100为EMM-REGISTERED.ATTEMPTING-TO-UPDATE态，且启动了T3346；
根据TS24.301 5.5.3中的如下内容：
[1]"Network failure":The UE shall stop timer T3430 if still running.The tracking area updating attempt counter shall be incremented,unless it was already set to 5.
[2]For the cases b,c,d,la k when the"Extended wait time"is ignored,and ka whenthe"Extended wait time CP data"is ignored,if the tracking area updating request isnot for initiating a PDN connection for emergency bearer services,the tracking area updating attempt counter shall be incremented,unless it was already set to 5.
[3]Abnormal cases in the UE,SMS services not accepted:The UE shall stop timer T3430if still running.The tracking area updating attempt counter shall be incremented,unless it was already set to 5；
[4]#17(Network failure):The UE shall stop timer T3430 if still running,and shall enter state MM IDLE.The tracking area updating attempt counter shall be incremented,unless it was already set to 5.
[5]if the combined tracking area update was successful for EPS services only and the TRACKING AREA UPDATE ACCEPT message contained an EMM cause value not treated in subclause 5.5.3.3.4.3 or the EMM Cause IE is not included in the message,the UE shall proceed as follows:The UE shall stop timer T3430if still running,and shall enter state MM IDLE.The tracking area updating attempt counter shall be incremented,unless it was already set to 5；
移动终端100可以在以下几种情况中将TAU尝试计数器的值加1：
1.“网络故障”：若TAU尝试计数器的值小于5，则该TAU尝试计数器的值加1。
2.对于b，c，d，la，k情况，如果TAU请求不是为紧急情况启动PDN连接，则忽略“延长的等待时间”时的k，忽略“延长的等待时间CP数据”时的ka承载服务，若TAU尝试计数器的值小于5，则该TAU尝试计数器的值加1。
移动终端100中异常情况，不接受SMS服务：如果移动终端100仍在运行，则它应停止T3410。若TAU尝试计数器的值小于5，则该TAU尝试计数器的值加1。
3.#17(网络故障)：如果T3410仍在运行，则它应停止T3410，并应进入状态MM IDLE。若TAU尝试计数器的值小于5，则该TAU尝试计数器的值加1。
4.如果组合连接仅对EPS服务成功，并且附着接受(attach accept)消息包含5.5.1.3.4.3条款未处理的EMM原因值，或者消息中未包含EMM原因IE，则移动终端100应当按以下步骤进行：如果T3410仍在运行，则它应停止T3410，并进入状态MM IDLE。若TAU尝试计数器的值小于5，则该TAU尝试计数器的值加1。
参考图8A及图8B，其示出了本申请实施例提供的在移动终端100上实现的一组用户界面。
如图8A及图8B所示，移动终端100的用户界面中显示有状态栏，状态栏中包括网络标识，网络标识用于指示当前移动终端接入的网络。网络标识的实现形式可以为文本、图标等等，本申请实施例不作限制。
如图8A所示，移动终端100在连续接入LTE网络失败并禁用E-UTRA能力的过程中，网络标识801可以为空，即不显示网络标识。若移动终端100禁用E-UTRA能力的过程中回落到2G/3G网络或者搜索到5G网络，在网络标识801可以显示为2G/3G/5G网络标识，例如文本“2G”、“3G”或“5G”等等。移动终端100连续接入LTE网络失败的场景可参考实施例1和实施例2的相关描述。
如图8B所示，移动终端100启用E-UTRA能力后，若移动到LTE网络状况良好的覆盖区域并成功接入LTE网络后，则用户界面中显示的网络标识801可用于指示LTE网络，例如可以为文本“4G”。
在本申请实施例中，图8A及图8B所示的用户界面可以被称为第一用户界面，该用户界面中用于显示网络标识的区域可以被称为第一区域。
不限于上述实施例所描述的移动终端接入LTE网络的场景，本申请实施例描述的技术方案还可以应用于移动终端接入其他制式的网络的场景中。其他制式的网络可包括但不限于2G、3G、新空口(new radio，NR)以及未来发展过程中的其他网络等等。例如，移动终端在NR中附着失败或者TAU失败的次数达到了阈值时，可以启动定时器，并禁用NR能力(disablethe NR capability)。在该定时器超时后，移动终端100重新尝试接入NR网络。该定时器的值由移动终端100根据自身的移动速度来确定。这里，该定时器的具体名称可参考相关协议，这里不作限制。
实施本申请实施例提供的技术方案，可以提高移动终端接入网络的效率，为用户提供良好的移动终端使用体验。
本申请的各实施方式可以任意进行组合，以实现不同的技术效果。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令 可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk)等。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，该流程可以由计算机程序来指令相关的硬件完成，该程序可存储于计算机可读取存储介质中，该程序在执行时，可包括如上述各方法实施例的流程。而前述的存储介质包括：ROM或随机存储记忆体RAM、磁碟或者光盘等各种可存储程序代码的介质。
总之，以上所述仅为本发明技术方案的实施例而已，并非用于限定本发明的保护范围。凡根据本发明的揭露，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (22)

  1. 一种移动终端接入LTE网络的方法，其特征在于，所述方法包括：
    所述移动终端附着失败或TAU失败的次数达到阈值；
    响应于所述移动终端附着失败或TAU失败的次数达到阈值，所述移动终端启动T3402定时器，并禁用E-UTRA能力；所述T3402定时器的时长由所述移动终端的移动速度决定，当所述移动速度达到第一值时，所述T3402定时器的时长小于第一默认时长；
    所述移动终端在所述T3402定时器超时后，重新搜索LTE网络，并向第一网络设备发送附着请求。
  2. 根据权利要求1所述的方法，其特征在于，
    当所述移动速度等于第一值时，所述T3402定时器的时长等于第一时长；当所述移动速度等于第二值时，所述T3402定时器的时长等于第二时长；
    其中，所述第二值大于所述第一值，所述第二时长小于所述第一时长，所述第一时长和所述第二时长均小于所述第一默认时长。
  3. 根据权利要求1所述的方法，其特征在于，
    当所述移动速度达到第一值时，所述T3402定时器的时长等于第二默认时长，所述第二默认时长小于所述第一默认时长。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，当所述移动速度小于所述第一值时，所述T3402定时器的时长等于所述第一默认时长。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述移动终端附着失败的次数达到阈值，具体包括：
    所述移动终端先后向第二网络设备发送n次附着请求；其中，每一次发送所述附着请求之后，均未收到所述第二网络设备发送的响应消息，或者，均接收到所述第二网络设备发送的附着拒绝消息；n等于所述阈值。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述移动终端TAU失败的次数达到阈值，具体包括：
    所述移动终端先后向第二网络设备发送n次TAU请求；其中，每一次发送所述TAU请求之后，均未收到所述第二网络设备发送的响应消息，或者，均接收到所述第二网络设备发送的TAU拒绝消息；n等于所述阈值。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述移动终端向所述第一网络设备发送附着请求之后，所述方法还包括：
    所述移动终端接收到所述第一网络设备发送的附着接受消息。
  8. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    所述移动终端显示第一用户界面，所述第一用户界面包括第一区域；
    其中，在所述移动终端接收到所述第一网络设备发送的附着接受消息之前，所述第一区域不显示内容，或者，所述第一区域显示当前所述移动终端接入的网络的标识；在所述移动终端接收到所述第一网络设备发送的附着接受消息之后，所述第一区域显示所述LTE网络的标识。
  9. 根据权利要求1-8任一项所述的方法，其特征在于，所述移动终端启动T3402定时器，并禁用E-UTRA能力之前，所述方法还包括：
    所述移动终端检测移动速度。
  10. 根据权利要求1-9任一项所述的方法，其特征在于，所述第一默认时长为12分钟。
  11. 一种移动终端，其特征在于，所述移动终端包括：存储器、一个或多个处理器；所述存储器与所述一个或多个处理器耦合，所述存储器用于存储计算机程序代码，所述计算机程序代码包括计算机指令，所述一个或多个处理器调用所述计算机指令以使得所述移动终端执行：
    附着失败或TAU失败的次数达到阈值；
    响应于所述移动终端附着失败或TAU失败的次数达到阈值，启动T3402定时器，并禁用E-UTRA能力；所述T3402定时器的时长由所述移动终端的移动速度决定，当所述移动速度达到第一值时，所述T3402定时器的时长小于第一默认时长；
    在所述T3402定时器超时后，重新搜索LTE网络，并向第一网络设备发送附着请求。
  12. 根据权利要求11所述的移动终端，其特征在于，
    当所述移动速度等于第一值时，所述T3402定时器的时长等于第一时长；当所述移动速度等于第二值时，所述T3402定时器的时长等于第二时长；
    其中，所述第二值大于所述第一值，所述第二时长小于所述第一时长，所述第一时长和所述第二时长均小于所述第一默认时长。
  13. 根据权利要求11所述的移动终端，其特征在于，当所述移动速度达到第一值时，所述T3402定时器的时长等于第二默认时长，所述第二默认时长小于所述第一默认时长。
  14. 根据权利要求11-13任一项所述的移动终端，其特征在于，当所述移动速度小于所述第一值时，所述T3402定时器的时长等于所述第一默认时长。
  15. 根据权利要求11-14任一项所述的移动终端，其特征在于，所述一个或多个处理器具体用于调用所述计算机指令以使得所述移动终端执行：
    先后向第二网络设备发送n次附着请求；其中，每一次发送所述附着请求之后，均未收到所述第二网络设备发送的响应消息，或者，均接收到所述第二网络设备发送的附着拒绝消息；n等于所述阈值。
  16. 根据权利要求11-15任一项所述的移动终端，其特征在于，所述一个或多个处理器具体用于调用所述计算机指令以使得所述移动终端执行：
    先后向第二网络设备发送n次TAU请求；其中，每一次发送所述TAU请求之后，均未收到所述第二网络设备发送的响应消息，或者，均接收到所述第二网络设备发送的TAU拒绝消息；n等于所述阈值。
  17. 根据权利要求11-16任一项所述的移动终端，其特征在于，所述一个或多个处理器还用于调用所述计算机指令以使得所述移动终端执行：
    向所述第一网络设备发送附着请求之后，接收到所述第一网络设备发送的附着接受消息。
  18. 根据权利要求17所述的移动终端，其特征在于，所述一个或多个处理器还用于调用所述计算机指令以使得所述移动终端执行：
    显示第一用户界面，所述第一用户界面包括第一区域；
    其中，在所述移动终端接收到所述第一网络设备发送的附着接受消息之前，所述第一区域不显示内容，或者，所述第一区域显示当前所述移动终端接入的网络的标识；在所述移动终端接收到所述第一网络设备发送的附着接受消息之后，所述第一区域显示所述LTE网络的标识。
  19. 根据权利要求11-18任一项所述的移动终端，其特征在于，所述一个或多个处理器还用于调用所述计算机指令以使得所述移动终端执行：
    在启动T3402定时器，并禁用E-UTRA能力之前，检测移动速度。
  20. 根据权利要求11-19任一项所述的移动终端，其特征在于，所述第一默认时长为12分钟。
  21. 一种包含指令的计算机程序产品，其特征在于，当所述计算机程序产品在电子设备上运行时，使得所述电子设备执行如权利要求1-10任一项所述的方法。
  22. 一种计算机可读存储介质，包括指令，其特征在于，当所述指令在电子设备上运行时，使得所述电子设备执行如权利要求1-10任一项所述的方法。
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