CN114765768A

CN114765768A - Network selection method and equipment

Info

Publication number: CN114765768A
Application number: CN202110051022.0A
Authority: CN
Inventors: 张号; 胡先专; 代贝; 胡浩; 齐先婷
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2022-07-19
Also published as: WO2022152167A1

Abstract

A network selection method and electronic equipment relate to the technical field of wireless communication, and the network selection method comprises the following steps: acquiring an identification of a home public mobile network (HPLMN); acquiring a public mobile network (PLMN) list, wherein the PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifiers; determining whether the PLMN list contains a HPLMN; selecting the HPLMN when it is determined that the PLMN list includes the HPLMN. Therefore, the terminal can preferentially select and register to the optimal PLMN network, and the emergency call request is initiated through the selected PLMN network, so that the success rate of the emergency call of the terminal is improved.

Description

Network selection method and equipment

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a network selection method and an electronic device.

Background

As network deployment becomes more complex, there may be a situation where networks of multiple operators are simultaneously covered in the same region. In this case, only one set of access network needs to be built in the same region, and different operators share the access network, the frequency point and the cell in a multi-operator core network (MOCN) manner, so that the operation cost is reduced. The emergency call is a special call service which is carried out when a user encounters an emergency such as medical assistance, fire alarm and the like, the terminal is in a flight mode, and the user dials numbers such as 110, 120, 911 and the like through the terminal. When the user starts the emergency call function, the terminal firstly initiates an emergency call service request to the base station, and the base station side establishes an emergency call session according to the emergency number called by the terminal to complete the emergency call process. When a user needs to use the emergency call function in a flight mode, the terminal needs to quit the flight mode in time, initiate startup network searching, and initiate an emergency call after the network is successfully resided.

In the MOCN, the same cell has a plurality of Public Land Mobile Networks (PLMNs), which are networks established and operated by governments or operators approved by the governments for the purpose of providing land mobile communication services to the public. The PLMNs have unique PLMN IDs that identify the different PLMNs. The user Home Public Land Mobile Network (HPLMN) is a PLMN provided by the user home network operator. The terminal may select and register with the non-HPLMN, which may result in an emergency call failure when the terminal initiates an emergency call request through the non-HPLMN.

Disclosure of Invention

In view of this, embodiments of the present invention provide a network selection method, by which a terminal may preferentially select and register to an optimal PLMN network, and initiate an emergency call request through the selected PLMN network, and the selected optimal PLMN network receives the emergency call request and executes an emergency call task through an emergency call system of the network, thereby improving a success rate of an emergency call of the terminal.

In a first aspect, an embodiment of the present application provides a network selection method, where the method includes: acquiring an identification of a home public mobile network (HPLMN); acquiring a public mobile network (PLMN) list, wherein the PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifiers; determining whether the PLMN list contains a HPLMN; selecting the HPLMN when it is determined that the PLMN list includes the HPLMN. Through the setting mode, the terminal can select to register to the HPLMN, and when the terminal initiates the emergency call through the HPLMN, the success rate of the emergency call can be improved.

In a possible implementation manner of the first aspect, the method further includes: upon determining that the PLMN list does not include the HPLMN, determining whether the PLMN list includes an equivalent Home public Mobile network (EHPLMN); selecting the EHPLMN when it is determined that the PLMN list includes the EHPLMN. Through the setting mode, the terminal can select to register to the EHPLMN, and when the terminal initiates an emergency call through the EHPLMN, the success rate of the emergency call can be improved.

According to the first aspect as such or any one of the above implementations of the first aspect, the method further comprises: and when the PLMN list is determined not to contain the EHPLMN, selecting the PLMN in the PLMN list according to the order of the PLMNs in the PLMN list.

According to a first aspect or any one of the above implementation manners of the first aspect, the determining whether the PLMN list includes the HPLMN comprises: analyzing the PLMN list to obtain the identifier of the PLMN; inquiring whether the identifier of the HPLMN is included according to the identifier of the PLMN in the PLMN list; and determining whether the PLMN list contains the HPLMN according to the query result.

According to a first aspect or any one of the above implementations of the first aspect, the determining whether the PLMN list includes the EHPLMN comprises: analyzing the PLMN list to obtain the identifier of the PLMN; inquiring whether the identifier of the EHPLMN is included according to the identifier of the PLMN in the PLMN list; and determining whether the PLMN list contains the EHPLMN according to the query result.

According to the first aspect as such or any one of the above implementations of the first aspect, the method further comprises: before acquiring the identifier of the HPLMN, detecting the operation of starting an emergency call function by a user; closing the flight mode between the steps of obtaining the identity of the HPLMN and obtaining the PLMN list.

According to a first aspect or any one of the above implementations of the first aspect, the method is applied to a multi-operator shared network (MOCN).

In a second aspect, an embodiment of the present application provides a terminal, where the terminal includes a touch screen, a memory, and a processor; wherein the storage stores one or more computer programs; the processor is configured to: acquiring an identification of a home public mobile network (HPLMN); acquiring a public mobile network (PLMN) list, wherein the PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifiers; determining whether the PLMN list contains a HPLMN; selecting the HPLMN when it is determined that the PLMN list includes the HPLMN. Through the setting mode, the terminal can select to register to the HPLMN, and when the terminal initiates the emergency call through the HPLMN, the success rate of the emergency call can be improved.

In one possible implementation manner of the second aspect, the processor is further configured to: upon determining that the PLMN list does not include the HPLMN, determining whether the PLMN list includes an equivalent Home public Mobile network (EHPLMN); selecting the EHPLMN when it is determined that the PLMN list contains the EHPLMN. Through the setting mode, the terminal can select to register to the EHPLMN, and when the terminal initiates an emergency call through the EHPLMN, the success rate of the emergency call can be improved.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: and when the PLMN list is determined not to contain the EHPLMN, selecting the PLMN in the PLMN list according to the order of the PLMNs in the PLMN list.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: analyzing the PLMN list to obtain the identifier of the PLMN; inquiring whether the identifier of the HPLMN is included according to the identifier of the PLMN in the PLMN list; and determining whether the PLMN list contains the HPLMN according to the query result.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: analyzing the PLMN list to obtain the identifier of the PLMN; inquiring whether the identifier of the EHPLMN is included according to the identifier of the PLMN in the PLMN list; and determining whether the PLMN list contains the EHPLMN according to the query result.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: before acquiring the identifier of the HPLMN, detecting the operation of starting an emergency call function by a user; closing the flight mode between the steps of obtaining the identity of the HPLMN and obtaining the PLMN list.

Through the scheme, in the MOCN, when a user can start the emergency call function of the terminal, the terminal can select the optimal PLMN network, the terminal can initiate an emergency call request through the selected HPLMN network or EHPLMN network, and the selected HPLMN network or EHPLMN network executes the emergency call task through the emergency call system of the network, so that the success rate of the emergency call is improved.

Drawings

In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from these drawings by a person skilled in the art without inventive exercise.

Fig. 1 is a schematic structural diagram of an apparatus provided in an embodiment of the present application;

Fig. 2 is a block diagram of a software structure of an apparatus according to an embodiment of the present disclosure;

FIG. 3A is a schematic diagram of an emergency call scenario;

FIG. 3B is a diagram illustrating an emergency call scenario;

fig. 4 is a schematic flowchart of a network selection method according to an embodiment of the present application;

fig. 5 is a signaling interaction diagram of a network selection method according to an embodiment of the present application.

Detailed Description

The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the specification of the present application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the listed items.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather mean "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically stated.

As used in the following embodiments, the term "when …" may be interpreted to mean "if …" or "after …" or "in response to determination …" or "in response to detection …", depending on the context. Similarly, depending on the context, the phrase "at the time of determination …" or "if (a stated condition or event) is detected" may be interpreted to mean "if the determination …" or "in response to the determination …" or "upon detection (a stated condition or event)" or "in response to detection (a stated condition or event)".

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be implemented in other sequences than those illustrated or described herein.

The following describes terminals and embodiments for using such terminals. In some embodiments, the terminal may be a wireless terminal. A terminal can also be called an electronic device, a subscriber unit, a subscriber station, mobile device, remote station, remote terminal, access terminal, user terminal, communication device, user agent, user device, or User Equipment (UE). A wireless terminal may be a cellular telephone, a satellite telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Personal Digital Assistant (PDA), a handheld device having wireless connection capability, a computing device, or other processing device connected to a wireless modem. Moreover, various aspects are described herein in connection with a base station. A base station may be utilized for communicating with wireless terminal(s) and may also be referred to as an access point, a node B, or some other terminology. The base station may be implemented as a radio base station of any suitable radio technology, e.g. a BTS (base transceiver station) of a GSM (global system for mobile communications), a NodeB of a HSPA (high speed packet access)/WCDMA (wireless code division multiple access) network, or an eNodeB of an LTE (long term evolution) communication network.

The embodiments of the present invention will be described below with reference to the drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 shows a schematic structural diagram of a terminal 100.

The 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, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identification Module (SIM) card interface 195, and the like. 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, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It is to be understood that the illustrated structure of the embodiment of the present invention does not specifically limit the terminal 100. In other embodiments of the present application, terminal 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units, such as: the processor 110 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processing units may be separate devices or may be integrated into one or more processors.

The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose-input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, a bus or Universal Serial Bus (USB) interface, and the like.

The I2C interface is a bi-directional synchronous serial bus that includes a serial data line (SDA) and a Serial Clock Line (SCL). In some embodiments, processor 110 may include multiple sets of I2C buses. The processor 110 may be coupled to the touch sensor 180K, charger, flash, camera 193, etc. through different I2C bus interfaces, respectively. For example: the processor 110 may be coupled to the touch sensor 180K through an I2C interface, such that the processor 110 and the touch sensor 180K communicate through an I2C bus interface to implement the touch function of the terminal 100.

The I2S interface may be used for audio communication. In some embodiments, processor 110 may include multiple sets of I2S buses. The processor 110 may be coupled to the audio module 170 via an I2S bus to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 may communicate audio signals to the wireless communication module 160 via the I2S interface, enabling answering of calls via a bluetooth headset.

The PCM interface may also be used for audio communication, sampling, quantizing and encoding analog signals. In some embodiments, the audio module 170 and the wireless communication module 160 may be coupled by a PCM bus interface. In some embodiments, the audio module 170 may also transmit audio signals to the wireless communication module 160 through the PCM interface, so as to implement a function of answering a call through a bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication.

The UART interface is a universal serial data bus used for asynchronous communications. The bus may be a bidirectional communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, a UART interface is generally used to connect the processor 110 and the wireless communication module 160. For example: the processor 110 communicates with a bluetooth module in the wireless communication module 160 through a UART interface to implement a bluetooth function. In some embodiments, the audio module 170 may transmit the audio signal to the wireless communication module 160 through a UART interface, so as to realize the function of playing music through a bluetooth headset.

MIPI interfaces may be used to connect processor 110 with peripheral devices such as display screen 194, camera 193, and the like. The MIPI interface includes a Camera Serial Interface (CSI), a Display Serial Interface (DSI), and the like. In some embodiments, processor 110 and camera 193 communicate through a CSI interface to implement the photographing function of terminal 100. The processor 110 and the display screen 194 communicate through the DSI interface to implement the display function of the terminal 100.

The GPIO interface may be configured by software. The GPIO interface may be configured as a control signal and may also be configured as a data signal. In some embodiments, a GPIO interface may be used to connect the processor 110 with the camera 193, the display 194, the wireless communication module 160, the audio module 170, the sensor module 180, and the like. The GPIO interface may also be configured as an I2C interface, an I2S interface, a UART interface, a MIPI interface, and the like.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 130 may be used to connect a charger to charge the terminal 100, and may also be used to transmit data between the terminal 100 and peripheral devices. And the earphone can also be used for connecting an earphone and playing audio through the earphone. The interface may also be used to connect other electronic devices, such as AR devices and the like.

It should be understood that the connection relationship between the modules according to the embodiment of the present invention is only illustrative, and is not limited to the structure of the terminal 100. In other embodiments of the present application, the terminal 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charging management module 140 is configured to receive charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the terminal 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140, and supplies power to the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be used to monitor parameters such as battery capacity, battery cycle count, battery state of health (leakage, impedance), etc. In some other embodiments, the power management module 141 may also be disposed in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be disposed in the same device.

The wireless communication function of the terminal 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The

antennas

1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in terminal 100 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication and the like applied to the terminal 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The mobile communication module 150 may receive the electromagnetic wave from the antenna 1, filter, amplify, etc. the received electromagnetic wave, and transmit the electromagnetic wave to the modem processor for demodulation. The mobile communication module 150 may also amplify the signal modulated by the modem processor, and convert the signal into electromagnetic wave through the antenna 1 to radiate the electromagnetic wave. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then passes the demodulated low frequency baseband signal to a baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor. The application processor outputs a sound signal through an audio device (not limited to the speaker 170A, the receiver 170B, etc.) or displays an image or video through the display screen 194. In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional modules, independent of the processor 110.

The wireless communication module 160 may provide solutions for wireless communication applied to the terminal 100, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), Infrared (IR), and the like. 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, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, perform frequency modulation and amplification on the signal, and convert the signal into electromagnetic waves through the antenna 2 to radiate the electromagnetic waves.

In some embodiments, the antenna 1 of the 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 terminal 100 can communicate with a network and other devices through a 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), Wideband Code Division Multiple Access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC, FM, and/or IR technologies, etc. The GNSS may include a Global Positioning System (GPS), a global navigation satellite system (GLONASS), a beidou satellite navigation system (BDS), a quasi-zenith satellite system (QZSS), and/or a Satellite Based Augmentation System (SBAS).

The terminal 100 implements a display function through the GPU, the display screen 194, and the application processor, etc. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 194 is used to display images, video, and the like. The display screen 194 includes a display panel. The display panel may adopt a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED), a flexible light-emitting diode (FLED), a miniature, a Micro-oeld, a quantum dot light-emitting diode (QLED), and the like. In some embodiments, the terminal 100 may include 1 or N display screens 194, with N being a positive integer greater than 1.

The terminal 100 may implement a photographing function through the ISP, the camera 193, the video codec, the GPU, the display screen 194, and the application processor, etc.

The ISP is used to process the data fed back by the camera 193. For example, when a photo is taken, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converting into an image visible to naked eyes. The ISP can also carry out algorithm optimization on the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image to the photosensitive element. The photosensitive element may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The light sensing element converts the optical signal into an electrical signal, which is then passed to the ISP where it is converted into a digital image signal. And the ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into image signal in standard RGB, YUV and other formats. In some embodiments, the terminal 100 may include 1 or N cameras 193, N being a positive integer greater than 1.

The digital signal processor is used for processing digital signals, and can process other digital signals besides digital image signals. For example, when the terminal 100 selects a frequency bin, the digital signal processor is configured to perform fourier transform or the like on the frequency bin energy.

Video codecs are used to compress or decompress digital video. The terminal 100 may support one or more video codecs. In this way, the terminal 100 can play or record video in a variety of encoding formats, such as: moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, and the like.

The NPU is a neural-network (NN) computing processor that processes input information quickly by using a biological neural network structure, for example, by using a transfer mode between neurons of a human brain, and can also learn by itself continuously. The NPU can implement applications such as intelligent recognition of the terminal 100, for example: image recognition, face recognition, speech recognition, text understanding, and the like.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the terminal 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card.

The internal memory 121 may be used to store computer-executable program code, which includes instructions. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (e.g., audio data, a phonebook, etc.) created during use of the terminal 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like. The processor 110 executes various functional applications of the terminal 100 and data processing by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The terminal 100 can implement an audio function through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the earphone interface 170D, and the application processor. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or some functional modules of the audio module 170 may be disposed in the processor 110.

The speaker 170A, also called a "horn", is used to convert the audio electrical signal into an acoustic signal. The terminal 100 can listen to music through the speaker 170A or listen to a handsfree call.

The receiver 170B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. When the terminal 100 receives a call or voice information, it can receive voice by bringing the receiver 170B close to the human ear.

The microphone 170C, also referred to as a "microphone," is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can input a voice signal to the microphone 170C by speaking the user's mouth near the microphone 170C. The terminal 100 may be provided with at least one microphone 170C. In other embodiments, the terminal 100 may be provided with two microphones 170C to achieve a noise reduction function in addition to collecting sound signals. In other embodiments, the terminal 100 may further include three, four or more microphones 170C to collect sound signals, reduce noise, identify sound sources, implement directional recording functions, and so on.

The earphone interface 170D is used to connect a wired earphone. The headset interface 170D may be the USB interface 130, or may be a 3.5mm open mobile electronic device platform (OMTP) standard interface, a cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 180A is used for sensing a pressure signal, and can convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A may be disposed on the display screen 194. Pressure sensor 180A

Such as resistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, etc. The capacitive pressure sensor may be a sensor comprising at least two parallel plates having an electrically conductive material. When a force acts on the pressure sensor 180A, the capacitance between the electrodes changes. The terminal 100 determines the intensity of the pressure according to the change in the capacitance. When a touch operation is applied to the display screen 194, the terminal 100 detects the intensity of the touch operation according to the pressure sensor 180A. The terminal 100 may also calculate the touched position based on the detection signal of the pressure sensor 180A. In some embodiments, the touch operations that are applied to the same touch position but different touch operation intensities may correspond to different operation instructions. For example: and when the touch operation with the touch operation intensity smaller than the first pressure threshold value acts on the short message application icon, executing an instruction for viewing the short message. And when the touch operation with the touch operation intensity larger than or equal to the first pressure threshold value acts on the short message application icon, executing an instruction of newly building the short message.

The gyro sensor 180B may be used to determine a motion attitude of the terminal 100. In some embodiments, the angular velocity of terminal 100 about three axes (i.e., x, y, and z axes) may be determined by gyroscope sensor 180B. The gyro sensor 180B may be used for photographing anti-shake. Illustratively, when the shutter is pressed, the gyro sensor 180B detects a shake angle of the terminal 100, calculates a distance to be compensated for by the lens module according to the shake angle, and allows the lens to counteract the shake of the terminal 100 by a reverse movement, thereby achieving anti-shake. The gyroscope sensor 180B may also be used for navigation, somatosensory gaming scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, the terminal 100 calculates an altitude from the barometric pressure measured by the barometric pressure sensor 180C to assist in positioning and navigation.

The magnetic sensor 180D includes a hall sensor. The terminal 100 may detect the opening and closing of the flip holster using the magnetic sensor 180D. In some embodiments, when the terminal 100 is a folder, the terminal 100 may detect the opening and closing of the folder according to the magnetic sensor 180D. And then according to the detected opening and closing state of the leather sheath or the opening and closing state of the flip, the characteristics of automatic unlocking of the flip and the like are set.

The acceleration sensor 180E may detect the magnitude of acceleration of the terminal 100 in various directions (generally, three axes). The magnitude and direction of gravity can be detected when the terminal 100 is stationary. The method can also be used for recognizing the posture of the electronic equipment, and is applied to horizontal and vertical screen switching, pedometers and other applications.

A distance sensor 180F for measuring a distance. The terminal 100 may measure the distance by infrared or laser. In some embodiments, the scene is photographed and the terminal 100 may range using the distance sensor 180F to achieve fast focus.

The proximity light sensor 180G may include, for example, a Light Emitting Diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The terminal 100 emits infrared light outward through the light emitting diode. The terminal 100 detects infrared reflected light from a nearby object using a photodiode. When sufficient reflected light is detected, it can be determined that there is an object near the terminal 100. When insufficient reflected light is detected, the terminal 100 may determine that there is no object near the terminal 100. The terminal 100 can utilize the proximity light sensor 180G to detect that the user holds the terminal 100 close to the ear for talking, so as to automatically turn off the screen to achieve the purpose of saving power. The proximity light sensor 180G may also be used in a holster mode, a pocket mode automatically unlocking and locking the screen.

The ambient light sensor 180L is used to sense the ambient light level. The terminal 100 may adaptively adjust the brightness of the display 194 according to the perceived ambient light level. The ambient light sensor 180L may also be used to automatically adjust the white balance when taking a picture. The ambient light sensor 180L may also cooperate with the proximity light sensor 180G to detect whether the terminal 100 is in a pocket to prevent accidental touches.

The fingerprint sensor 180H is used to collect a fingerprint. The terminal 100 can utilize the collected fingerprint characteristics to realize fingerprint unlocking, access to an application lock, fingerprint photographing, fingerprint incoming call answering, and the like.

The temperature sensor 180J is used to detect temperature. In some embodiments, the terminal 100 executes a temperature processing strategy using the temperature detected by the temperature sensor 180J. For example, when the temperature reported by the temperature sensor 180J exceeds a threshold, the terminal 100 performs a reduction in performance of a processor located near the temperature sensor 180J, so as to reduce power consumption and implement thermal protection. In other embodiments, terminal 100 heats battery 142 when the temperature is below another threshold to avoid a low temperature causing abnormal shutdown of terminal 100. In other embodiments, the terminal 100 performs boosting of the output voltage of the battery 142 when the temperature is below a further threshold value to avoid abnormal shutdown due to low temperature.

The touch sensor 180K is also called a "touch device". 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, which is also called a "touch screen". The touch sensor 180K is used to detect a touch operation acting thereon or nearby. The touch sensor can communicate the detected touch operation to the application processor to determine the touch event type. Visual output associated with the touch operation may be provided through the display screen 194. In other embodiments, the touch sensor 180K may be disposed on the surface of the terminal 100 at a position different from the position of the display screen 194.

The bone conduction sensor 180M may acquire a vibration signal. In some embodiments, the bone conduction sensor 180M may acquire a vibration signal of the human vocal part vibrating the bone mass. The bone conduction sensor 180M may also contact the human pulse to receive the blood pressure pulsation signal. In some embodiments, the bone conduction sensor 180M may also be disposed in a headset, integrated into a bone conduction headset. The audio module 170 may analyze a voice signal based on the vibration signal of the bone mass vibrated by the sound part acquired by the bone conduction sensor 180M, so as to implement a voice function. The application processor can analyze heart rate information based on the blood pressure beating signal acquired by the bone conduction sensor 180M, so as to realize the heart rate detection function.

The keys 190 include a power-on key, a volume key, and the like. The keys 190 may be mechanical keys. Or may be touch keys. The terminal 100 may receive a key input, and generate a key signal input related to user setting and function control of the terminal 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration cues, as well as for touch vibration feedback. For example, touch operations applied to different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 191 may also respond to different vibration feedback effects for touch operations applied to different areas of the display screen 194. Different application scenes (such as time reminding, receiving information, alarm clock, game and the like) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card can be brought into and out of contact with the terminal 100 by being inserted into the SIM card interface 195 or being pulled out of the SIM card interface 195. The terminal 100 may support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 may support a Nano SIM card, a Micro SIM card, a SIM card, etc. The same SIM card interface 195 can be inserted with multiple cards at the same time. The types of the plurality of cards may be the same or different. The SIM card interface 195 may also be compatible with different types of SIM cards. The SIM card interface 195 is also compatible with external memory cards. The terminal 100 interacts with the network through the SIM card to implement functions such as communication and data communication. In some embodiments, the terminal 100 employs eSIM, namely: an embedded SIM card. The eSIM card can be embedded in the terminal 100 and cannot be separated from the terminal 100.

The software system of the terminal 100 may adopt a hierarchical architecture, an event-driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture. The embodiment of the present invention takes an Android system with a layered architecture as an example, and exemplarily illustrates a software structure of the terminal 100.

Fig. 2 is a block diagram of a software configuration of the terminal 100 according to the embodiment of the present invention.

The layered architecture divides the software into several layers, each layer having a clear role and division of labor. The layers communicate with each other through a software interface. In some embodiments, the Android system is divided into four layers, an application layer, an application framework layer, an Android runtime (Android runtime) and system library, and a kernel layer from top to bottom.

The application layer may include a series of application packages.

As shown in fig. 2, the application package may include applications such as camera, gallery, calendar, phone call, map, navigation, WLAN, bluetooth, music, video, short message, etc.

The application framework layer provides an Application Programming Interface (API) and a programming framework for the application program of the application layer. The application framework layer includes a number of predefined functions.

As shown in FIG. 2, the application framework layers may include a window manager, content provider, view system, phone manager, resource manager, notification manager, and the like.

The window manager is used for managing window programs. The window manager can obtain the size of the display screen, judge whether a status bar exists, lock the screen, intercept the screen and the like.

The content provider is used to store and retrieve data and make it accessible to applications. The data may include video, images, audio, calls made and received, browsing history and bookmarks, phone books, etc.

The view system includes visual controls such as controls to display text, controls to display pictures, and the like. The view system may be used to build applications. The display interface may be composed of one or more views. For example, 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 a communication function of the terminal 100. Such as management of call status (including on, off, etc.).

The resource manager provides various resources for the application, such as localized strings, icons, pictures, layout files, video files, and the like.

The notification manager enables the application to display notification information in the status bar, can be used to convey notification-type messages, can disappear automatically after a short dwell, and does not require user interaction. Such as a notification manager used to inform download completion, message alerts, etc. The notification manager may also be a notification that appears in the form of a chart or scroll bar text at the top status bar of the system, such as a notification of a background running application, or a notification that appears on the screen in the form of a dialog window. For example, prompting text information in the status bar, sounding a prompt tone, vibrating the electronic device, flashing an indicator light, etc.

The Android Runtime comprises a core library and a virtual machine. The Android runtime is responsible for scheduling and managing an Android system.

The core library comprises two parts: one part is a function which needs to be called by java language, and the other part is a core library of android.

The application layer and the application framework layer run in a virtual machine. And executing java files of the application program layer and the application program framework layer into a binary file by the virtual machine. The virtual machine is used for performing the functions of object life cycle management, stack management, thread management, safety and exception management, garbage collection and the like.

The system library may include a plurality of functional modules. For example: surface managers (surface managers), Media Libraries (Media Libraries), three-dimensional graphics processing Libraries (e.g., OpenGL ES), 2D graphics engines (e.g., SGL), and the like.

The surface manager is used to manage the display subsystem and provide a fusion of the 2D and 3D layers for multiple applications.

The media library supports a variety of commonly used audio, video format playback and recording, and still image files, among others. The media library may support a variety of audio-video encoding formats, such as MPEG4, h.264, MP3, AAC, AMR, JPG, PNG, and the like.

The three-dimensional graphic processing library is used for realizing three-dimensional graphic drawing, image rendering, synthesis, layer processing and the like.

The 2D graphics engine is a drawing engine for 2D drawing.

The kernel layer is a layer between hardware and software. The inner core layer at least comprises a display driver, a camera driver, an audio driver and a sensor driver.

Fig. 3A depicts a scenario in which the terminal 100 initiates an emergency call in an area covered by a PLMN-1 network. Referring to fig. 3A, PLMN-1 may represent a PLMN provided by operator a. The HPLMN of the terminal 100 is PLMN-2, and the SIM card of the terminal 100 may contain information of the HPLMN of the terminal 100, where PLMN-2 may represent a PLMN provided by operator B. The base station 301 is used to access the PLMN-1 network provided by operator a. The terminal 100 may initiate an emergency call request in an area covered by the PLMN-1 network, where the emergency call refers to a special call service performed by dialing a number, such as 110, 120, 911, through the terminal when a user encounters an emergency in an airplane mode. Illustratively, a user firstly starts an emergency call function on the terminal 100, the terminal 100 turns off an airplane mode, initiates network searching, searches for an available PLMN-1, requests the terminal 100 to register to the PLMN-1 network, and sends an emergency call request to the PLMN-1 network through the base station 301 after the terminal 100 registers to the PLMN-1 network. The emergency call request transmitted by the terminal 100 is processed by the emergency call processing system of the PLMN-1 network. However, the PLMN-1 network is not the HPLMN network of the terminal 100, and the emergency call processing system of the PLMN-1 network may reject the emergency call request, thereby causing the emergency call to fail.

Fig. 3B depicts a scenario in which the terminal 100 initiates an emergency call in a multi-operator core network (MOCN). In the MOCN network, the same area can be covered by networks of multiple operators at the same time. The terminal 100 can access PLMNs of different operators through the same base station 301, and the different operators share an access network, frequency points, and cells by using an MOCN.

Referring to fig. 3B, PLMN-1 may represent a PLMN provided by operator a, PLMN-2 may represent a PLMN provided by operator B, and PLMN-3 may represent a PLMN provided by operator C. The HPLMN of the terminal 100 is PLMN-2. The base station broadcasts a PLMN list corresponding to an area in which the current terminal is located through system message 1 (systemlnformationblocktype 1, SIB1), for example, the PLMN list includes PLMN-1, PLMN-2, and PLMN-3. The PLMNs in the PLMN list have priorities, and the PLMNs in the PLMN list are sorted according to priorities, which may be preset by an operator, for example, the priority of PLMN-1 is greater than that of PLMN-2, and the priority of PLMN-2 is greater than that of PLMN-3, which may indicate an order in which a user requests registration to a corresponding network when searching for a network. Exemplarily, when the user starts the emergency call function on the terminal 100, the terminal 100 turns off the flight mode, and after receiving the system message SIB1 sent by the base station 301, the terminal will request to register in the corresponding network according to the priority of the PLMN in the PLMN list, and after the registration is successful, initiate the emergency call. For example, the PLMN-1 in the PLMN list has the highest priority, and when the terminal 100 is powered on to search for a network, and after acquiring the PLMN list, the terminal 100 first initiates a registration request to the PLMN-1, and after successfully registering to the PLMN-1 network, the terminal 100 initiates an emergency call request through the PLMN-1 network. However, the emergency call request transmitted by the terminal 100 is processed by the emergency call processing system of the PLMN-1 network. Since the PLMN-1 network is not the HPLMN network of the terminal 100, the emergency call processing system of the PLMN-1 network may reject the emergency call request, thereby causing the emergency call to fail.

Fig. 4 is a flowchart of a network selection method according to an embodiment of the present application. The network selection method can be applied to an MOCN network, and a user starts a scene of an emergency call function when a terminal is in a flight mode. Referring to fig. 4, the network selection method may include the steps of:

step 410: when a user starts an emergency call function in an airplane mode, the terminal can acquire PLMN information of the SIM card, and the PLMN information of the SIM card contains HPLMN information of the terminal. The terminal turns off the flight mode. And after the terminal closes the flight mode, the terminal can receive the system message broadcast by the base station.

Step 420: the terminal receives the SIB1 system message broadcast by the base station. The SIB1 system message broadcast by the base station includes a PLMN list in the area where the current terminal is located. And after receiving the system message SIB1, the terminal analyzes the system message SIB1 and acquires a PLMN list.

Step 430: the terminal inquires whether the PLMN list contains the HPLMN of the terminal according to the obtained PLMN list, and if the PLMN list contains the HPLMN of the terminal, step 440 is executed. The PLMNs have unique PLMN IDs that identify the different PLMNs. Whether the HPLMN is included can be known by querying the PLMN ID. Illustratively, the obtained PLMN list includes three PLMNs, PLMN IDs of the three PLMNs are PLMN-1, PLMN-2, and PLMN-3, respectively, and a PLMN ID of the HPLMN of the terminal is PLMN-2. After inquiring that PLMN-2 is included in the PLMN list, the terminal performs step 440.

Step 440: the terminal selects the HPLMN network, wherein the selection of the HPLMN network indicates that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the HPLMN network.

Step 450: if the PLMN list does not include the HPLMN of the terminal, it is queried whether the PLMN list includes an Equivalent Home Public Land Mobile Network (EHPLMN) of the terminal. The EHPLMN is a PLMN that is co-located with the HPLMN of the terminal. The EHPLMN also has a PLMN ID for identifying a different EHPLMN, and may perform a query according to the PLMN ID of the EHPLMN, if yes, then step 460 is performed.

Step 460: the terminal selects the EHPLM network, wherein the selection of the EHPLM network means that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the EHPLMN network.

Step 470: and if the PLMN list does not contain the EHPLM of the terminal, the terminal selects the PLMN with high priority according to the priority of the PLMN network in the PLMN list, and initiates a registration request to the PLMN with high priority.

Step 480: after the terminal registers to the selected network, an emergency call request is initiated through the selected network, and the network selected by the terminal receives the emergency call request and executes the emergency call task.

Fig. 5 is a signaling interaction diagram of a network selection method according to an embodiment of the present application. Referring to fig. 5, the network selection method may include the steps of:

step S501: the terminal acquires PLMN information of the SIM card after detecting that a user starts an emergency call function in a flight mode, wherein the PLMN information of the SIM card comprises HPLMN information of the terminal, and the terminal closes the flight mode. After the terminal closes the flight mode, the network searching can be started.

Step S502: and the base station sends SIB1 system message to the terminal by broadcasting, wherein the SIB1 system message contains PLMN list in the area where the current terminal is located.

Step S503: and after receiving the system message SIB1, the terminal analyzes the system message SIB1 and acquires a PLMN list.

Step S504: after acquiring the PLMN list, the terminal inquires whether the PLMN list contains the HPLMN of the terminal, if the PLMN list contains the HPLMN of the terminal, the terminal selects the HPLMN network, wherein the selection of the HPLMN network indicates that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the HPLMN network. If the HPLMN of the terminal is not included, whether the PLMN list includes the EHPLM of the terminal is inquired, if the HPLMN of the terminal is included, the terminal selects the EHPLM network, wherein the selection of the EHPLM network means that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the EHPLMN network. If the terminal does not contain the EHPLM of the terminal, the terminal selects the PLMN with high priority according to the priority of the PLMN network in the PLMN list, and initiates a registration request to the PLMN with high priority.

Step S505: and after the selected network registration is successful, the terminal initiates an emergency call request. The network selected by the terminal receives the emergency call request and performs the emergency call task through an emergency call system of the network.

By the method, when a user starts an emergency call function of the terminal in the MOCN network, the terminal can acquire HPLMN information in the SIM, close the flight mode, acquire a PLMN list in the area by analyzing a system message SIB1 broadcasted by the base station, and perform inquiry according to the PLMN ID based on the acquired PLMN list to preferentially select the HPLMN network and the EHPLMN network in the PLMN list. After the terminal successfully registers the selected HPLMN network or EHPLMN network, the terminal can initiate an emergency call request through the selected HPLMN network or EHPLMN network, the selected HPLMN network or EHPLMN network receives the emergency call request, and the emergency call task is executed through the emergency call system of the network, so that the success rate of the emergency call is improved.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.

Each functional unit in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application disclosed in the embodiment should be covered by the scope of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of network selection, the method comprising:

acquiring an identification of a home public mobile network (HPLMN);

acquiring a public mobile network (PLMN) list, wherein the PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifiers;

determining whether the PLMN list contains a HPLMN;

selecting the HPLMN when it is determined that the PLMN list includes the HPLMN.

2. The method of claim 1, further comprising:

Upon determining that the PLMN list does not contain the HPLMN, determining whether the PLMN list contains an equivalent Home public Mobile network (EHPLMN);

selecting the EHPLMN when it is determined that the PLMN list contains the EHPLMN.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

when the PLMN list is determined not to contain the EHPLMN, selecting the PLMN in the PLMN list according to the order of the PLMNs in the PLMN list.

4. The method of any of claims 1-3, wherein the determining whether the PLMN list contains the HPLMN comprises:

analyzing the PLMN list to obtain the identifier of the PLMN;

inquiring whether the identifier of the HPLMN is included according to the identifier of the PLMN in the PLMN list;

and determining whether the PLMN list contains the HPLMN according to the query result.

5. The method of any of claims 1-4, wherein the determining whether the PLMN list contains the EHPLMN comprises:

analyzing the PLMN list to obtain the identifier of the PLMN;

inquiring whether the identifier of the EHPLMN is included according to the identifier of the PLMN in the PLMN list;

and determining whether the PLMN list contains the EHPLMN according to the query result.

6. The method according to any one of claims 1-5, further comprising:

before acquiring the HPLMN identifier, detecting the operation of starting the emergency call function by the user;

closing the flight mode between the steps of obtaining the identity of the HPLMN and obtaining the PLMN list.

7. Method according to any of claims 1-6, characterized in that it is applied to a multi-operator shared network (MOCN).

8. A terminal is characterized in that the terminal comprises a touch screen, a memory and a processor; wherein the storage stores one or more computer programs;

wherein the processor is configured to: acquiring an identification of a home public mobile network (HPLMN); acquiring a public mobile network (PLMN) list, wherein the PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifiers; determining whether the PLMN list contains a HPLMN; selecting the HPLMN when it is determined that the PLMN list includes the HPLMN.

9. The terminal of claim 8, wherein the processor is further configured to: upon determining that the PLMN list does not include the HPLMN, determining whether the PLMN list includes an equivalent Home public Mobile network (EHPLMN); selecting the EHPLMN when it is determined that the PLMN list includes the EHPLMN.

10. The terminal according to claim 8 or 9, wherein the processor is further configured to: when the PLMN list is determined not to contain the EHPLMN, selecting the PLMN in the PLMN list according to the order of the PLMNs in the PLMN list.

11. The terminal according to any of claims 8-10, wherein the processor is further configured to: analyzing the PLMN list to obtain the identifier of the PLMN; inquiring whether the identifier of the HPLMN is included according to the identifier of the PLMN in the PLMN list; and determining whether the PLMN list contains the HPLMN according to the query result.

12. The terminal according to any of claims 8-11, wherein the processor is further configured to: analyzing the PLMN list to obtain the identifier of the PLMN; inquiring whether the identifier of the EHPLMN is included according to the identifier of the PLMN in the PLMN list; and determining whether the PLMN list contains the EHPLMN according to the query result.

13. The terminal according to any of claims 8-12, wherein the processor is further configured to: before acquiring the identifier of the HPLMN, detecting the operation of starting an emergency call function by a user; closing the flight mode between the steps of obtaining the identity of the HPLMN and obtaining the PLMN list.