CN116669009A

CN116669009A - Communication method of terminal equipment and corresponding equipment

Info

Publication number: CN116669009A
Application number: CN202210152937.5A
Authority: CN
Inventors: 齐晓东; 杨林; 程庆; 高鹏; 张开兵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2023-08-29

Abstract

The application discloses a communication method of terminal equipment, which is in an international roaming state. The terminal equipment receives the system information sent by the network equipment and determines whether the network equipment is located at the border or not according to the information in the border identification bit in the system information. If the network equipment is located at the border, the terminal equipment executes international roaming reselection operation, so that the communication charge of the terminal equipment can be reduced. If the network equipment is not located at the border, the terminal equipment closes the international roaming network reselection function, so that the power consumption of the terminal equipment can be reduced.

Description

Communication method of terminal equipment and corresponding equipment

Technical Field

The application relates to the technical field of communication, in particular to a communication method of terminal equipment and corresponding equipment.

Background

The terminal equipment is easily roamed from a local public land mobile network (Home Public Land Mobile Network, HPLMN), also commonly referred to as a home network, to a network in a nearby country when used in a border region. Since international roaming tariffs are generally high, the user wishes to be able to return to the home network in time by reselection when the home network is available.

For a terminal device which is already in its national abdomen and in an international roaming state, it is of no significance to try to reselect the home network, since there is no home network coverage, the attempt to reselect is reversed, so that the power loss of the terminal device is greater.

At present, no suitable scheme exists, the two different scenes can be identified, and different strategies are adopted to meet the requirements of users on communication charge and power consumption.

Disclosure of Invention

The application provides a communication method of terminal equipment, which is used for selecting a processing strategy suitable for a current network for the terminal equipment in an international roaming state so as to reduce communication cost or reduce power consumption of the terminal equipment. The application also provides a corresponding terminal device, a computer readable storage medium, a computer program product and the like.

The first aspect of the present application provides a communication method of a terminal device, including: the terminal equipment receives a system message sent by the network equipment, wherein the system message comprises a border identification bit, and information in the border identification bit is used for indicating whether the network equipment is located at a border or not, and the terminal equipment is in an international roaming state; if the information in the border identification indicates that the network equipment is located at the border, the terminal equipment executes international roaming reselection operation; if the information in the border identification indicates that the network equipment is not located at the border, the terminal equipment closes the international roaming network reselection function.

In the present application, the terminal device being in an international roaming state means that the terminal device has access to networks of other countries, not home networks of the home country. The home network refers to a communication network in which the terminal device is registered at the time of the network access application. If the home network belongs to a first country, the network device is located in a second country. The terminal device being in an international roaming state may be that the terminal device has undergone international roaming when the terminal device moves to a border with the second country, or that the terminal device has undergone international roaming into the abdomen of the second country.

In the present application, the system message may be a system information block (system information block, SIB) message. The border identification and the information in the border identification may be configured at the time of establishing the network device. The border identification bit may be set in an idle field in the SIB message, or may be set in the SIB message by adding a field. The information in the border identification bit may be represented by 0 or 1, for example: 0 may indicate that the network device is not located at a border and 1 indicates that the network device is located at a border. The information in the border identification may also be represented by F/T, where F may indicate that the network device is not located at a border and T indicates that the network device is located at a border. Of course, the information in the border identification bit may also be used to indicate whether the network device is located in a border, which is not limited in the present application.

In the application, the terminal equipment in the international roaming state can determine whether the terminal equipment is located at the border according to the information in the border identification bit in the system message, and then select a proper processing strategy, such as: if the terminal equipment is in the border, the international roaming back selection operation is executed to reduce the communication charge of the terminal equipment, and if the terminal equipment is not in the border, the international roaming network back selection function is closed to reduce the power consumption of the terminal equipment.

In a possible implementation manner of the first aspect, if the information in the border identification indicates that the network device is located at a border, the system message further includes at least one mobile country code (mobile country code, MCC).

In this possible implementation, the at least one MCC included in the system message is the MCC of at least one neighboring country of the second country covered by the signal of the network device, one MCC per country. The terminal equipment can determine whether to contain the MCC of the first country to which the home network belongs according to the at least one MCC to determine the processing strategy, so that the accuracy of determining the processing strategy after the terminal equipment generates international roaming in the border is improved.

In a possible implementation manner of the first aspect, the steps are as follows: if the information in the border identification indicates that the network device is located in the border, the terminal device executes international roaming reselection operation, including: if the information in the border indicator indicates that the network device is located in the border and the at least one MCC includes the MCC of the first country, the terminal device performs the international roaming reselection operation, and the first country is the country to which the home network of the terminal device belongs.

In this possible implementation manner, if at least one MCC includes the MCC of the first country, the possibility that the terminal device has a home network reselection is indicated, and the terminal device performs the international roaming reselection operation again, so that the success rate of reselection can be improved.

In a possible implementation manner of the first aspect, the method further includes: if the at least one MCC does not include the MCC of the first country, the terminal equipment closes the international roaming network reselection function, and the first country is the country to which the home network of the terminal equipment belongs.

In this possible implementation manner, if at least one MCC does not include the MCC of the first country, the terminal device does not have the possibility of selecting back to the home network, and the terminal device closes the international roaming network reselection function, so that the power consumption of the terminal device can be reduced.

In a possible implementation manner of the first aspect, the steps are as follows: the terminal device executes international roaming reselection operation, including: if the border reselection cell list contains information of international roaming cells accessed by the terminal equipment on the network equipment, the terminal equipment determines reselection cells from the border reselection cell list, wherein the border reselection cell list comprises a corresponding relation between the information of the international roaming cells and the information of the reselection cells, and the reselection cells are cells which are successfully reselected from the international roaming cells; the terminal equipment accesses the reselection cell.

In the possible implementation manner, the border reselection cell list contains the information of the international roaming cell and the information of the cell which is successfully reselected once, and when the terminal equipment executes the reselection operation, the reselection cell is determined from the border reselection cell list, so that the success rate of reselection can be improved, and the reselection speed can be improved.

In a possible implementation manner of the first aspect, if the border reselection cell list includes information of a plurality of cells that are once reselected successfully corresponding to information of the international roaming cell, the information of the reselected cell is that the last one of the information of the plurality of cells that are once reselected successfully joins the border reselection cell list, or the reselected cell is that a cell with the strongest signal strength among the plurality of cells that are once reselected successfully.

In the possible implementation manner, when a plurality of cells which are once successful in reselection are available for selection, the cell which is once successful in reselection and added into the border reselection cell list last can be selected, or the cell with the strongest signal strength in the cells which are once successful in reselection can be used as the reselection cell, so that the success rate of reselection can be improved, and the reselection speed can be improved.

In a possible implementation manner of the first aspect, the steps are as follows: the terminal device executes international roaming reselection operation, including: if the border reselection cell list does not contain information of the international roaming cell accessed by the terminal equipment on the network equipment, the terminal equipment initiates reselection in an idle state to determine the reselection cell; the terminal equipment accesses the reselection cell.

In the possible implementation manner, if the border reselection cell list does not contain information of the international roaming cell accessed by the terminal equipment on the network equipment, the terminal equipment can determine the reselection cell by initiating reselection in an idle state, so that reselection failure caused by that the border reselection cell list does not contain a proper reselection cell can be avoided, and the success rate of reselection is further improved.

In a possible implementation manner of the first aspect, the method further includes: and the terminal equipment adds the corresponding relation between the information of the international roaming cell and the information of the reselection cell into the border reselection cell list.

In the possible implementation manner, after the terminal equipment is successfully reselected in the idle state through the reselection operation, the corresponding relation between the information of the international roaming cell and the information of the reselected cell can be added into the border reselection cell list, so that the border reselection cell list is updated, and the reselected cell can be quickly determined from the border reselection cell list when the international roaming occurs later.

In a possible implementation manner of the first aspect, the method further includes: and the terminal equipment receives a border reselection cell list from the cloud equipment, wherein the border reselection cell list is obtained by fusing border reselection cell lists sent by a plurality of terminal equipment by the cloud equipment.

In the possible implementation manner, the border reselection cell list sent by the plurality of terminal devices can be fused through the cloud device to obtain a list warehouse, and then the list warehouse is sent to each terminal device, so that the terminal device can update the locally maintained border reselection cell list by using the list warehouse. Therefore, the corresponding relation in the border reselection cell list can be increased rapidly, and when the reselection operation occurs, the terminal equipment can determine the reselection cell from the border reselection cell list rapidly, so that the success rate of reselection is improved, and the reselection speed is improved.

A second aspect of the present application provides a terminal device, including:

the receiving unit is used for receiving the system message sent by the network equipment, the system message comprises a border identification bit, and the information in the border identification bit is used for indicating whether the network equipment is located at the border or not, and the terminal equipment is in an international roaming state.

And the first processing unit is used for executing the international roaming reselection operation if the information in the border identification indicates that the network equipment is located at the border.

And the second processing unit is used for closing the international roaming network reselection function if the information in the border identification indicates that the network equipment is not located at the border.

In a possible implementation manner of the second aspect, if the information in the border identification indicates that the network device is located at a border, the system message further includes at least one mobile country code MCC.

In a possible implementation manner of the second aspect, the first processing unit is configured to perform the international roaming reselection operation if the information in the border indicator indicates that the network device is located in a border, and the at least one MCC includes an MCC of a first country, where the home network of the terminal device belongs to.

In a possible implementation manner of the second aspect, the second processing unit is further configured to close the international roaming network reselection function if the at least one MCC does not include a MCC of a first country, where the home network of the terminal device belongs.

In a possible implementation manner of the second aspect, the first processing unit is configured to: if the border reselection cell list contains information of international roaming cells accessed by the terminal equipment on the network equipment, determining reselection cells from the border reselection cell list, wherein the border reselection cell list comprises a corresponding relation between the information of the international roaming cells and the information of the reselection cells, and the reselection cells are cells which are successfully reselected from the international roaming cells; and accessing the reselection cell.

In one possible implementation manner of the second aspect, if the border reselection cell list includes information of a plurality of cells that are once reselected successfully corresponding to the information of the international roaming cell, the information of the reselected cell is that the last one of the information of the plurality of cells that are once reselected successfully is added to the border reselection cell list, or the reselected cell is that a cell with the strongest signal strength among the plurality of cells that are once reselected successfully.

In a possible implementation manner of the second aspect, the first processing unit is configured to: if the border reselection cell list does not contain the information of the international roaming cell accessed by the terminal equipment on the network equipment, the reselection is initiated in an idle state to determine the reselection cell; and accessing the reselection cell.

In a possible implementation manner of the second aspect, the first processing unit is further configured to add a correspondence between information of the international roaming cell and information of the reselection cell to a border reselection cell list.

In a possible implementation manner of the second aspect, the receiving unit is further configured to receive a border reselection cell list from the cloud device, where the border reselection cell list is obtained by fusing border reselection cell lists sent by the plurality of terminal devices.

A third aspect of the present application provides a terminal device for performing the method of the first aspect or any possible implementation of the first aspect.

A fourth aspect of the application provides a chip system comprising one or more interface circuits and one or more processors; the interface circuit and the processor are interconnected through a circuit; the interface circuit is used for receiving signals from the memory of the terminal equipment and sending signals to the processor, wherein the signals comprise computer instructions stored in the memory; when the processor executes the computer instructions, the terminal device performs the method of the first aspect or any possible implementation of the first aspect.

A fifth aspect of the application provides a computer readable storage medium having stored thereon a computer program or instructions which, when run on a computer, cause the computer to perform the method of the first aspect or any possible implementation of the first aspect.

A sixth aspect of the application provides a computer program product comprising computer program code which, when executed on a computer, causes the computer to perform the method of the first aspect or any of the possible implementations of the first aspect.

The technical effects of the second, third, fourth, fifth, and sixth aspects or any one of the possible implementation manners of the second, third, fourth, fifth, and sixth aspects may be referred to the technical effects of the first aspect or the different possible implementation manners of the first aspect, which are not described herein.

Drawings

Fig. 1A is a schematic diagram of an application scenario of a communication method according to an embodiment of the present application;

fig. 1B is a schematic diagram of another application scenario of a communication method according to an embodiment of the present application;

fig. 1C is a schematic diagram of another application scenario of a communication method according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 3 is a schematic diagram of an embodiment of a communication method of a terminal device according to an embodiment of the present application;

FIG. 4A is a schematic diagram of a system message according to an embodiment of the present application;

FIG. 4B is another schematic diagram of a system message according to an embodiment of the present application;

fig. 5A is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 5B is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 5C is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

Fig. 6A is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 6B is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 7A is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 7B is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 7C is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 8 is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 9 is a schematic diagram of another embodiment of a communication method of a terminal device according to an embodiment of the present application;

fig. 10 is another schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will now be described with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the present application. As one of ordinary skill in the art can know, with the development of technology and the appearance of new scenes, the technical scheme provided by the embodiment of the application is also applicable to similar technical problems.

The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The embodiment of the application provides a communication method of terminal equipment, which is used for selecting a processing strategy suitable for a current network for the terminal equipment in an international roaming state so as to reduce communication charge or reduce power consumption of the terminal equipment. The application also provides a corresponding terminal device, a computer readable storage medium, a computer program product and the like. The following will describe in detail.

Before describing the method provided by the embodiment of the present application, an application scenario of the method provided by the embodiment of the present application is described. The application scenario of the method provided by the embodiment of the application can be shown in fig. 1A to 1C.

Fig. 1A shows an application scenario in which a terminal device whose registered home network belongs to country a is located in country a. The application scene comprises: the terminal equipment is located in the A country but is located near the border line of the two countries, and the terminal equipment is originally provided with communication service by the network equipment 1 of the A country, but is accessed to the network equipment 2 of the B country along with the movement of the terminal equipment, so that the terminal equipment is in an international roaming state.

Fig. 1B shows another application scenario in which a terminal device whose registered home network belongs to country a is in country a. The application scene comprises: country a, country B and country C, the terminal device is located in the country a border, but is located near the border lines of the three countries, the terminal device is originally provided with communication services by the network device 1 of country a, but is connected to the network device 2 of country B along with the movement of the terminal device, and is in an international roaming state.

Fig. 1C shows an application scenario in which a terminal device whose registered home network belongs to country a is located in the abdomen of country B. In the application scenario, the terminal device is already in the country B, a network device in the country B provides communication services for the terminal device, and the terminal device is in an international roaming state.

In the embodiment of the present application, the terminal device roaming to the B country near the border line as shown in fig. 1A or fig. 1B may return to the network device 1 of the a country or other network devices of the a country through the network reselection, so that the tariffs may be reduced. The terminal device located in the abdomen of B country as shown in fig. 1C has no possibility of network reselection, the international roaming reselection function may be turned off, so that the power consumption of the terminal device may be reduced.

The terminal device described above may be a digital display product such as a mobile phone, a subscriber identity module (subscriber identity module, SIM), a tablet (pad), a portable game machine, a palm computer (personal digital assistant, PDA), a notebook computer, an ultra mobile personal computer (ultra mobile personal computer, UMPC), a handheld computer, a netbook, a vehicle-mounted media playing device, a wearable electronic device, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, and the like. The embodiment of the application is described by taking the mobile phone as an example only for the terminal equipment.

Fig. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 2, the terminal device may include a processor 210, an external memory interface 220, an internal memory 221, a universal serial bus (universal serial bus, USB) interface 230, a charge management module 240, a power management module 241, a battery 242, an antenna 1, an antenna 2, a mobile communication module 250, a wireless communication module 260, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, an earphone interface 270D, a sensor module 280, a key 290, a motor 291, an indicator 292, a camera 293, a display 294, a subscriber identity module (subscriber identification module, SIM) card interface 295, and the like. The sensor module 280 may include, among other things, a pressure sensor 280A, a gyroscope sensor 280B, a barometric pressure sensor 280C, a magnetic sensor 280D, an acceleration sensor 280E, a distance sensor 280F, a proximity light sensor 280G, a fingerprint sensor 280H, a temperature sensor 280J, a touch sensor 280K, an ambient light sensor 280L, a bone conduction sensor 280M, a motion sensor 280N, and the like.

It will be appreciated that the structure illustrated in this embodiment does not constitute a specific limitation on the terminal device. In other embodiments, the terminal device may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 210 may include one or more processing units such as, for example: the processor 210 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), a controller, a memory, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller may be a neural hub and command center of the terminal device. The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 210 for storing instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. The memory may hold instructions or data that the processor 210 has just used or recycled. If the processor 210 needs to reuse the instruction or data, it may be called directly from the memory. Repeated accesses are avoided and the latency of the processor 210 is reduced, thereby improving the efficiency of the system.

In some embodiments, processor 210 may include one or more interfaces. The interfaces may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (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 (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

It should be understood that the connection relationship between the modules illustrated in this embodiment is only illustrative, and does not limit the structure of the terminal device. In other embodiments, the terminal device may also use different interfacing manners in the foregoing embodiments, or a combination of multiple interfacing manners.

The charge management module 240 is configured to receive a charge input from a charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charge management module 240 may receive a charging input of a wired charger through the USB interface 230. In some wireless charging embodiments, the charge management module 240 may receive wireless charging input through a wireless charging coil of the terminal device. The charging management module 240 may also supply power to the terminal device through the power management module 241 while charging the battery 242.

The power management module 241 is used for connecting the battery 242, and the charge management module 240 and the processor 210. The power management module 241 receives input from the battery 242 and/or the charge management module 240 and provides power to the processor 210, the internal memory 221, the external memory, the display 294, the camera 293, the wireless communication module 260, and the like. The power management module 241 may also be configured to monitor battery capacity, battery cycle times, battery health (leakage, impedance), and other parameters. In other embodiments, the power management module 241 may also be disposed in the processor 210. In other embodiments, the power management module 241 and the charge management module 240 may be disposed in the same device.

The wireless communication function of the terminal device may be implemented by the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modem processor, the baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the terminal device may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into 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 250 may provide a solution for wireless communication including 2G/3G/4G/5G or the like applied on a terminal device. The mobile communication module 250 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The mobile communication module 250 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 250 can amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate. In some embodiments, at least some of the functional modules of the mobile communication module 250 may be disposed in the processor 210. In some embodiments, at least some of the functional modules of the mobile communication module 250 may be provided in the same device as at least some of the modules of the processor 210.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating the 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 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 then transferred to the application processor. The application processor outputs sound signals through an audio device (not limited to speaker 270A, receiver 270B, etc.), or displays images or video through display screen 294. 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 250 or other functional module, independent of the processor 210.

The wireless communication module 260 may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wireless fidelity (wireless fidelity, wi-Fi) network), bluetooth (BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field wireless communication technology (near field communication, NFC), infrared technology (IR), etc. for application on a terminal device. The wireless communication module 260 may be one or more devices that integrate at least one communication processing module. The wireless communication module 260 receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 210. The wireless communication module 260 may also receive a signal to be transmitted from the processor 210, frequency modulate it, amplify it, and convert it to electromagnetic waves for radiation via the antenna 2.

In some embodiments, the antenna 1 and the mobile communication module 250 of the terminal device are coupled, and the antenna 2 and the wireless communication module 260 are coupled, so that the terminal device can communicate with the network and other devices through wireless communication technology. The wireless communication techniques may include the Global System for Mobile communications (global system for mobile communications, GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TDSCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC, FM, and/or IR techniques, among others. The GNSS may include a global satellite positioning system (global positioning system, GPS), a global navigation satellite system (global navigation satellite system, GLONASS), a beidou satellite navigation system (beidou navigation satellite system, BDS), a quasi zenith satellite system (quasi-zenith satellite system, QZSS) and/or a satellite based augmentation system (satellite based augmentation systems, SBAS).

The terminal device implements display functions through a GPU, a display screen 294, an application processor, and the like. The GPU is a microprocessor for image processing, and is connected to the display screen 294 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 210 may include one or more GPUs that execute program instructions to generate or change display information.

The display 294 is used to display images, videos, and the like. The display 294 includes a display panel. The display panel may employ a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (OLED), an active-matrix organic light emitting diode (AMOLED), a flexible light-emitting diode (flex), a mini, a Micro-OLED, a quantum dot light-emitting diode (quantum dot light emitting diodes, QLED), or the like.

The terminal device may implement a photographing function through the ISP, the camera 293, the video codec, the GPU, the display 294, the application processor, and the like.

The ISP is used to process the data fed back by the camera 293. For example, when photographing, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electric signal, and the camera photosensitive element transmits the electric signal to the ISP for processing and is converted into an image visible to naked eyes. ISP can also optimize 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 the camera 293.

The camera 293 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image onto the photosensitive element. The photosensitive element may be a charge coupled device (charge coupled device, CCD) or a Complementary Metal Oxide Semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, which is then transferred to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV, or the like format. In some embodiments, the terminal device may include 1 or N cameras 293, N being a positive integer greater than 1.

The camera 293 may also be used to provide a personalized, contextual business experience to the user by the terminal device based on perceived external circumstances and actions of the user. The camera 293 can acquire abundant and accurate information, so that the terminal device perceives external environments and actions of a user. Specifically, in the embodiment of the present application, the camera 293 may be used to identify whether the user of the terminal device is the first user or the second user.

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 device selects a frequency bin, the digital signal processor is used to fourier transform the frequency bin energy, etc.

Video codecs are used to compress or decompress digital video. The terminal device may support one or more video codecs. In this way, the terminal device may play or record video in multiple encoding formats, for example: dynamic picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

The NPU is a neural-network (NN) computing processor, and can rapidly process input information by referencing a biological neural network structure, for example, referencing a transmission mode between human brain neurons, and can also continuously perform self-learning. Applications such as intelligent cognition of terminal equipment can be realized through NPU, for example: image recognition, face recognition, speech recognition, text understanding, etc.

The external memory interface 220 may be used to connect an external memory card, such as a Micro SD card, to realize expansion of the memory capability of the terminal device. The external memory card communicates with the processor 210 through an external memory interface 220 to implement data storage functions. For example, files such as music, video, etc. are stored in an external memory card.

Internal memory 221 may be used to store computer executable program code that includes instructions. The processor 210 executes various functional applications of the terminal device and data processing by executing instructions stored in the internal memory 221. For example, in an embodiment of the present application, the processor 210 may display corresponding display contents on the display screen in response to a user's operation on the display screen 294 by executing instructions stored in the internal memory 221. The internal memory 221 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data created during use of the terminal device (such as audio data, phonebook, etc.), etc. In addition, the internal memory 221 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 (universal flash storage, UFS), and the like.

The terminal device may implement audio functions through an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, an earphone interface 270D, an application processor, and the like. Such as music playing, recording, etc.

The audio module 270 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 270 may also be used to encode and decode audio signals. In some embodiments, the audio module 270 may be disposed in the processor 210, or some functional modules of the audio module 270 may be disposed in the processor 210. Speaker 270A, also referred to as a "horn," is used to convert audio electrical signals into sound signals. The terminal device can listen to music through the speaker 270A or listen to hands-free calls. A receiver 270B, also referred to as a "earpiece", is used to convert the audio electrical signal into a sound signal. When the terminal device picks up a call or voice message, the voice can be picked up by placing the receiver 270B close to the human ear. Microphone 270C, also referred to as a "microphone" or "microphone," is used to convert sound signals into electrical signals. When making a call or sending a voice message or when it is desired to trigger the terminal device to perform certain functions by means of a voice assistant, the user can sound near the microphone 270C through his mouth, inputting a sound signal to the microphone 270C. The terminal device may be provided with at least one microphone 270C. In other embodiments, the terminal device may be provided with two microphones 270C, and may implement a noise reduction function in addition to collecting sound signals. In other embodiments, the terminal device may be further provided with three, four or more microphones 270C to collect sound signals, reduce noise, identify the source of sound, implement directional recording functions, etc.

The earphone interface 270D is for connecting a wired earphone. Earphone interface 270D may be USB interface 230 or a 3.5mm open mobile terminal platform (open mobile terminal platform, OMTP) standard interface, american cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 280A is used to sense a pressure signal, and may convert the pressure signal into an electrical signal. In some embodiments, pressure sensor 280A may be disposed on display 294. The pressure sensor 280A is of various types, such as a resistive pressure sensor, an inductive pressure sensor, a capacitive pressure sensor, and the like. The capacitive pressure sensor may be a capacitive pressure sensor comprising at least two parallel plates with conductive material. When a force is applied to the pressure sensor 280A, the capacitance between the electrodes changes. The terminal device determines the strength of the pressure from the change in capacitance. When a touch operation is applied to the display screen 294, the terminal apparatus detects the intensity of the touch operation based on the pressure sensor 280A. The terminal device may also calculate the location of the touch based on the detection signal of the pressure sensor 280A. In some embodiments, touch operations that act on the same touch location, but at different touch operation strengths, may correspond to different operation instructions. For example: when a touch operation with the touch operation intensity smaller than the pressure threshold is applied to the short message application icon, executing an instruction for checking the short message. And executing the instruction of newly creating the short message when the touch operation with the touch operation intensity being larger than or equal to the pressure threshold acts on the short message application icon.

The gyro sensor 280B may be used to determine the motion gesture of the terminal device. In some embodiments, the angular velocity of the terminal device about three axes (i.e., x, y, and z axes) may be determined by gyro sensor 280B. The gyro sensor 280B may be used for photographing anti-shake. Illustratively, when the shutter is pressed, the gyro sensor 280B detects the shake angle of the terminal device, calculates the distance to be compensated by the lens module according to the angle, and makes the lens counteract the shake of the terminal device through reverse movement, thereby realizing anti-shake. The gyro sensor 280B may also be used for navigating, somatosensory game scenes. In addition, the gyro sensor 280B may also be used to measure the rotation amplitude or the moving distance of the terminal device.

The air pressure sensor 280C is used to measure air pressure. In some embodiments, the terminal device calculates altitude from barometric pressure values measured by barometric pressure sensor 280C, aiding in positioning and navigation.

The magnetic sensor 280D includes a hall sensor. The terminal device may detect the opening and closing of the flip holster using the magnetic sensor 280D. In some embodiments, when the terminal device is a flip machine, the terminal device may detect the opening and closing of the flip according to the magnetic sensor 280D. 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 280E may detect the magnitude of acceleration of the terminal device in various directions (typically three axes). The magnitude and direction of gravity can be detected when the terminal device is stationary. The method can also be used for identifying the gesture of the terminal equipment, and is applied to the applications such as horizontal and vertical screen switching, pedometers and the like. In addition, the acceleration sensor 280E may also be used to measure the orientation (i.e., the directional vector of the orientation) of the terminal device.

A distance sensor 280F for measuring distance. The terminal device may measure the distance by infrared or laser. In some embodiments, the terminal device may range using the distance sensor 280F to achieve fast focus.

Proximity light sensor 280G 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 device emits infrared light outwards through the light emitting diode. The terminal device detects infrared reflected light from nearby objects using a photodiode. When sufficient reflected light is detected, it can be determined that there is an object in the vicinity of the terminal device. When insufficient reflected light is detected, the terminal device may determine that there is no object in the vicinity of the terminal device. The terminal device can use the proximity light sensor 280G to detect that the user holds the terminal device close to the ear for communication, so as to automatically extinguish the screen to achieve the purpose of saving electricity. The proximity light sensor 280G may also be used in holster mode, pocket mode to automatically unlock and lock the screen.

The ambient light sensor 280L is used to sense ambient light level. The terminal device may adaptively adjust the brightness of the display 294 based on the perceived ambient light level. The ambient light sensor 280L may also be used to automatically adjust white balance during photographing. The ambient light sensor 280L may also cooperate with the proximity light sensor 280G to detect if the terminal device is in a pocket to prevent false touches.

The fingerprint sensor 280H is used to collect a fingerprint. The terminal equipment can utilize the collected fingerprint characteristics to realize fingerprint unlocking, access the application lock, fingerprint photographing, fingerprint incoming call answering and the like.

The temperature sensor 280J is used to detect temperature. In some embodiments, the terminal device performs a temperature processing strategy using the temperature detected by temperature sensor 280J. For example, when the temperature reported by the temperature sensor 280J exceeds a threshold, the terminal device performs a reduction in the performance of a processor located in the vicinity of the temperature sensor 280J in order to reduce power consumption for implementing thermal protection. In other embodiments, the terminal device heats the battery 242 when the temperature is below another threshold to avoid the terminal device from being abnormally shut down due to low temperatures. In other embodiments, when the temperature is below a further threshold, the terminal device performs boosting of the output voltage of the battery 242 to avoid abnormal shutdown caused by low temperatures.

The touch sensor 280K, also referred to as a "touch panel". The touch sensor 280K may be disposed on the display screen 294, and the touch sensor 280K and the display screen 294 form a touch screen, which is also referred to as a "touch screen". The touch sensor 280K is used to detect a touch operation acting on or near it. The touch sensor may communicate the detected touch operation to the application processor to determine the touch event type. Visual output related to touch operations may be provided through the display 294. In other embodiments, the touch sensor 280K may also be disposed on a surface of the terminal device at a different location than the display 294.

Bone conduction sensor 280M may acquire a vibration signal. In some embodiments, bone conduction sensor 280M may acquire a vibration signal of a human vocal tract vibrating bone pieces. The bone conduction sensor 280M may also contact the pulse of the human body to receive the blood pressure pulsation signal. In some embodiments, bone conduction sensor 280M may also be provided in a headset, in combination with an osteoinductive headset. The audio module 270 may analyze the voice signal based on the vibration signal of the sound portion vibration bone piece obtained by the bone conduction sensor 280M, so as to implement the voice function. The application processor can analyze heart rate information based on the blood pressure beat signal acquired by the bone conduction sensor 280M, so as to realize a heart rate detection function.

The motion sensor 280N may acquire operational data.

Keys 290 include a power on key, a volume key, etc. The keys 290 may be mechanical keys. Or may be a touch key. The terminal device may receive key inputs, generating key signal inputs related to user settings of the terminal device and function control.

The terminal device recognizes the operations (including the first operation, the second operation, the third operation, etc.) mentioned in the embodiment of the present application through various sensors in the sensor module 280, the key 290, and/or the camera 293.

The motor 291 may generate a vibration alert. The motor 291 may be used for incoming call vibration alerting or for touch vibration feedback. For example, touch operations acting on different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 291 may also correspond to different vibration feedback effects by touch operations applied to different areas of the display 294. Different application scenarios (such as time reminding, receiving information, alarm clock, game, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

The indicator 292 may be an indicator light, which may be used to indicate a state of charge, a change in power, a message indicating a missed call, a notification, etc.

The SIM card interface 295 is for interfacing with a SIM card. The SIM card may be inserted into the SIM card interface 295 or removed from the SIM card interface 295 to enable contact and separation from the terminal apparatus. The terminal device may support 1 or N SIM card interfaces, N being a positive integer greater than 1. The SIM card interface 295 may support Nano SIM cards, micro SIM cards, and the like. The same SIM card interface 295 may be used to insert multiple cards simultaneously. The types of the plurality of cards may be the same or different. The SIM card interface 295 may also be compatible with different types of SIM cards. The SIM card interface 295 may also be compatible with external memory cards. The terminal equipment interacts with the network through the SIM card to realize the functions of communication, data communication and the like. In some embodiments, the terminal device employs esims, namely: an embedded SIM card. The eSIM card can be embedded in the terminal device and cannot be separated from the terminal device.

The following description will be given of a communication method based on a roaming terminal device provided in an embodiment of the present application, taking a mobile phone as an example. The method may be performed by a terminal device or by a component of a terminal device (e.g., a processor, chip, or system-on-chip, etc.).

As shown in fig. 3, an embodiment of a communication method of a terminal device provided in an embodiment of the present application may include:

301. The terminal equipment receives a system message sent by the network equipment, wherein the system message comprises a border identification bit, and the terminal equipment is in an international roaming state.

The terminal device being in an international roaming state means that the terminal device has access to a network of another country than the home network of the home country. The home network refers to a communication network in which the terminal device is registered at the time of the network access application. If the home network belongs to a first country, the network device is located in a second country. The terminal device being in an international roaming state may be that the terminal device has undergone international roaming when the terminal device moves to a border with the second country, or that the terminal device has undergone international roaming into the abdomen of the second country.

The home network to which the terminal device is registered belongs to a first country, such as country a in fig. 1A to 1C, and the network device is located within a second country, such as country B in fig. 1A to 1C.

The system message may be a system information block (system information block, SIB) message.

The information in the border identification is used to indicate whether the network device is located in a border, and the border identification and the information in the border identification may be configured when the network device is established.

302. And if the information in the border identification indicates that the network equipment is located at the border, the terminal equipment executes the international roaming network reselection operation.

In the embodiment of the present application, the international roaming network reselection refers to switching the service network of the terminal device in the international roaming state from the network device of other countries to the network device of the home country, for example: the service network of the terminal device in fig. 1A or 1B is switched by the network device 2 of country B back to the network device 1 of country a.

303. If the information in the border identification indicates that the network equipment is not located at the border, the terminal equipment closes the international roaming network reselection function.

In the embodiment of the application, if the international roaming network reselection function is opened, the terminal equipment can continuously search the network in the home country, and the power consumption is larger.

In the embodiment of the application, the terminal equipment in the international roaming state can determine whether the terminal equipment is located at the border according to the information in the border identification bit in the system message, and then select a proper processing strategy, such as: if the terminal equipment is in the border, the international roaming back selection operation is executed to reduce the communication charge of the terminal equipment, and if the terminal equipment is not in the border, the international roaming network back selection function is closed to reduce the power consumption of the terminal equipment.

In the embodiment of the present application, as shown in fig. 4A, taking the system message as an SIB message as an example, the border identification bit may be set in an idle field in the SIB message, or may be set in the SIB message by adding a new field. The information in the border identification bit may be represented by 0 or 1, for example: 0 may indicate that the network device is not located at a border and 1 indicates that the network device is located at a border. The information in the border identification may also be represented by F/T, where F may indicate that the network device is not located at a border and T indicates that the network device is located at a border. Of course, the information in the border identification bit may also be used to indicate whether the network device is located in the border, which is not limited in the embodiment of the present application.

In the embodiment of the present application, if the information in the border indicator indicates that the network device is located at the border, the system message further includes at least one mobile country code (mobile country code, MCC). The at least one MCC included in the system message is the MCC of at least one neighboring country of the second country to which the signal of the network device covers, one MCC per country. The terminal equipment can determine whether to contain the MCC of the first country to which the home network belongs according to the at least one MCC to determine the processing strategy, so that the accuracy of determining the processing strategy after the terminal equipment generates international roaming in the border is improved.

Taking the system message as an example of SIB message, when the information in the border identification indicates that the network device is located in a border, a mobile country code (mobile country code, MCC) of a neighboring country on the border may also be set in the SIB message, as shown in fig. 4B: MCC1 and MCC2, etc. MCC1 is the MCC of one neighboring country on the border, MCC2 is the MCC of another neighboring country on the border. As in fig. 1A, for network device 2 in country B, the MCC in country a may be configured in a SIB message, such as: MCC1 represents the MCC of country a, and represents the border where network device 2 is located in country a and country B. As in fig. 1B, for network device 2 in country B, the MCC in country a (e.g., MCC1 for MCC in country a) and the MCC in country C (e.g., MCC2 for MCC in country C) may be configured in the SIB message, indicating that network device 2 is located in the borders of country a, country B and country C. The number of MCCs in the SIB message depends on the border of several countries where the network device is located, which is not limited in the embodiment of the present application.

For the case that the SIB message contains the MCC of the neighboring country, the terminal device may determine which two countries or which several countries the network device is in, according to the MCC of the neighboring country.

The embodiment of the method provided by the application relates to two aspects of closing the international roaming network reselection function and executing network reselection by the terminal equipment, and is respectively described below.

1. And closing the international roaming network reselection function.

In the embodiment of the application, the mode of closing the international roaming network reselection function can be automatically closed or manually closed. Automatic shutdown as shown in fig. 5A, when the terminal device determines that the network device is not located in the border of the second country (e.g., country B in fig. 5A) according to the information (0/F) in the border identification, the international roaming network reselection function is automatically shut down.

When the user closes manually, as shown in fig. 5B, the terminal device may also prompt the user to close the international roaming network reselection function manually when it is determined that the network device is not located in the second country border (e.g., country B in fig. 5B), and the user closes the international roaming network reselection function manually.

Optionally, in the embodiment of the present application, if at least one MCC does not include the MCC of the first country, the terminal device closes the international roaming network reselection function, and the first country is the country to which the home network of the terminal device belongs. If at least one MCC does not comprise the MCC of the first country, the possibility that the terminal equipment does not have the function of selecting back to the home network is indicated, and the terminal equipment closes the international roaming network selecting back function, so that the power consumption of the terminal equipment can be reduced.

Such as: the international roaming network reselection function may also be turned off when the information in the border identification in the SIB message is 1 or T, and the SIB message contains MCC but does not contain a scene of MCC of the country to which the terminal device belongs. As shown in fig. 5C, when a terminal device belonging to D, which belongs to the home network, moves to the border of a, B, and C in a country a, the terminal device roams from network device 1 of a to network device 2 of B. The network device 2 sends an SIB message to the terminal device of the home network belonging to the D country, where the information in the border identifier of the SIB message is 1 or T, which indicates that the network device 2 of the B country is located in the border, and the SIB message further includes MCC1 and MCC2, where MCC1 is MCC of the a country, MCC2 is MCC of the C country, and no MCC of the D country exists, and the terminal device of the home network belonging to the D country may close the international roaming network reselection function. The closing mode can be automatic closing or manual closing.

2. The terminal device performs network reselection.

As shown in fig. 6A, when a terminal device belonging to the a country moves to the border between the a country and the B country within the a country, the terminal device roams from the network device 1 of the a country to the network device 2 of the B country. The network device 2 sends an SIB message to the terminal device, where the information in the border identification bit of the SIB message is 1 or T, which indicates that the network device 2 in the B country is located in the border, and the terminal device may perform network reselection according to the information in the border identification bit, and switch from the network device 2 in the B country to the network device 1 in the a country after searching for the network device 1 in the a country.

Optionally, in the embodiment of the present application, if the information in the border indicator indicates that the network device is located in a border, and the at least one MCC includes a MCC of a first country, the terminal device performs an international roaming reselection operation, and the first country is a country to which the home network of the terminal device belongs. If the at least one MCC comprises the MCC of the first country, the possibility that the terminal equipment has the return to the home network is indicated, and the terminal equipment executes the international roaming return operation, so that the success rate of the return selection can be improved.

Such as: as can be understood with reference to fig. 6B, when the terminal device belonging to the a country is moved to the border of the a country, the B country, and the C country in the a country, the registered home network roams from the network device 1 of the a country to the network device 2 of the B country, as shown in fig. 6B. The network device 2 sends an SIB message to the terminal device, where the information in the border identifier of the SIB message is 1 or T, which indicates that the network device 2 in the B country is located in the border, and the SIB message further includes MCC1 and MCC2, where MCC1 is MCC in the a country, MCC2 is MCC in the C country, the terminal device learns that there is a possibility of reselecting the network in the a country according to MCC1, and then performs network reselection, and switches from the network device 2 in the B country to the network device 1 in the a country after searching for the network device 1 in the a country.

In the embodiment of the application, the process of determining the cells on the network equipment of the home country of the reselection can have the following schemes:

1. and determining from the border reselection cell list configured by the terminal equipment.

Optionally, in the embodiment of the present application, if the border reselection cell list includes information of an international roaming cell accessed by the terminal device on the network device, the terminal device determines a reselection cell from the border reselection cell list, where the border reselection cell list includes a correspondence between information of the international roaming cell and information of the reselection cell, and the reselection cell is a cell that is once reselected successfully from the international roaming cell; the terminal equipment accesses the reselection cell.

The border reselection cell list provided by the embodiment of the application can be generated and maintained by the terminal equipment, and can also be downloaded from the cloud, and the border reselection cell list can be understood by referring to the following table 1.

Table 1: border reselection cell list

Information of international roaming cell	Information of cells once successfully reselected
		Information of cell a	Information of cell 1
Information of cell B	Information of cell 2
		Information of cell C	Information of cell 3
…	…

It should be noted that, table 1 is only an example, and in general, the border reselection cell list includes a correspondence between information of more international roaming cells and information of cells that have been successfully reselected.

The international roaming cell refers to an international roaming cell to which the terminal device or other terminal devices have been accessed. The cell indication that the reselection was successful is that the terminal device or other terminal device has reselected to the cell from the corresponding international roaming cell.

In the embodiment of the present application, the information of the international roaming cell and the information of the cell that has been successfully selected back may include at least one of the identifier of the public land mobile network (Public Land Mobile Network, PLMN) of the cell, the identifier of the cell (cell ID), and the information of the frequency point. Of course, the information of the cell may also include other information that may represent the cell.

When the terminal device receives the SIB message and performs network reselection, it may first search a border reselection cell list, for example, in table 1, and select, from the border reselection cell list, a cell that has been successfully reselected and corresponds to the international roaming cell included in the SIB message for access. The following two schemes 1.1 and 1.2 are available for selecting from the border reselection cell list, and are described below.

1.1, when there is a scheme of once-successfully reselected cell corresponding to the information of the international roaming cell in the border reselection cell list.

As shown in fig. 7A, the terminal device with the registered home network belonging to the a country roams from the network device 1 of the a country to the network device 2 of the B country at the border, the network device 2 sends an SIB message to the terminal device, where the information in the border identification included in the SIB message is 1 or T, which indicates that the network device 2 is located at the border, and of course, the SIB message may also include the MCC of the a country, which indicates that the terminal device may reselect to the network device of the a country to which the terminal device belongs.

Since a network device may have a plurality of cells, the terminal device may reselect to a cell during reselection, and the SIB message may further include information about the cell that the terminal device accesses on the network device 2, such as information about cell a.

The terminal device may search the border reselection cell list shown in, for example, table 1, to find the corresponding relation between the information of cell a and the information of cell 1, to indicate that the terminal device or other terminal devices have successfully reselected from cell a to cell 1, and the terminal device may reselect cell 1 as a preference, and if the reselection is successful, the terminal device switches back to cell 1.

Of course, in the embodiment of the present application, the mode of selecting back the cell list through border is not limited to this mode of selecting back the cell list through border, and cell selection can be performed through other modes, but the mode of selecting back the cell list through border provided by the embodiment of the present application can improve the success rate of selecting back and improve the speed of selecting back.

1.2, when there are multiple cells that were successfully reselected corresponding to the information of the international roaming cell in the border reselection cell list.

Optionally, in the embodiment of the present application, if the border reselection cell list includes information of a plurality of cells that are once successful in reselection corresponding to information of the international roaming cell, the information of the reselected cell is the last cell added to the border reselection cell list in the information of the plurality of cells that are once successful in reselection, or the reselected cell is the cell with the strongest signal strength in the plurality of cells that are once successful in reselection.

In the solution introduced in 1.1 above, only the information of cell 1 corresponding to the information of cell a in the border reselection cell list may actually have a plurality of correspondence relations containing the information of cell a in the border reselection cell list, as shown in table 2:

table 2: border reselection cell list

Information of international roaming cell	Information of cells once successfully reselected
		Information of cell a	Information of cell 1
Information of cell a	Information of cell 2
		Information of cell B	Information of cell 2
Information of cell C	Information of cell 3
		…	…

As can be seen from table 2, the cells in the border reselection cell list corresponding to the cell a that were successfully reselected once have the cell 1 and the cell 2, wherein the correspondence between the information of the cell a and the information of the cell 1 is newly added to table 2, and the correspondence between the information of the cell a and the information of the cell 2 is earlier added to table 2.

As shown in fig. 7B, the cell 1 may be selected as the reselection cell according to the correspondence between the information of the cell a and the information of the cell 1, which are newly added to table 2, because the correspondence between the information of the cell a and the information of the cell 1 is newly added to table 2, which indicates that the correspondence is verified, the correspondence between the information of the cell a and the information of the cell 1 is more reliable than the correspondence between the information of the cell a and the information of the cell 2, which is easy to be reselected successfully, and the reselection success rate and the speed of the reselection of the cell may be improved.

Of course, in the embodiment of the present application, the method is also not limited to the method shown in fig. 7B, and referring to fig. 7C, the terminal device detects all the cells which have a correspondence with the cell a and have once been successfully reselected once in table 2 once, determines the cell with the strongest signal, then selects the cell with the strongest signal as the reselected cell, and in fig. 7C, after detecting the signal strength of the cell which has a correspondence with the cell a and has once been successfully reselected once, determines that the cell 1 is the cell with the strongest signal strength, and switches back to the cell 1 as the reselected cell. The cell with the strongest signal strength is selected as the reselection cell, so that the success rate of reselection can be improved.

2. Adaptively selecting the reselection cells, and updating a border reselection cell list.

In the reselection schemes described in fig. 7A to 7C, the border reselection cell list includes the correspondence between the information of the international roaming cell issued in the SIB message and the information of the cell that was successfully reselected once, and when the border reselection cell list does not include the correspondence between the information of the international roaming cell issued in the SIB message and the information of the cell that was successfully reselected once, or when the terminal device does not select the reselection cell from the border reselection cell list, the reselection process may be executed through the scheme shown in fig. 8.

As shown in fig. 8, the terminal device with the registered home network belonging to the a country roams from the network device 1 of the a country to the network device 2 of the B country at the border, the network device 2 sends an SIB message to the terminal device, where the information in the border identification included in the SIB message is 1 or T, which indicates that the network device 2 is located at the border, and of course, the SIB message may also include the MCC of the a country, which indicates that the terminal device may reselect to the network device of the a country to which the terminal device belongs.

The terminal device may first find a border reselection cell list on the terminal device, for example, as shown in table 3, table 3 is as follows:

table 3: border reselection cell list

Information of international roaming cell	Information of cells once successfully reselected
		Information of cell B	Information of cell 2
Information of cell C	Information of cell 3
		…	…

As can be seen from table 3, the border reselection cell list does not include information of cells which have been successfully reselected and have a corresponding relationship with the information of the cell a, and at this time, the terminal device may perform the following procedure to determine to reselect cells for cell reselection.

801. The terminal device starts a reselection timer set to N seconds and initiates reselection when the idle state continues for N seconds.

802. It is determined whether the reselection is successful, if yes, step 803 is executed, and if not, step 804 is executed.

803. If the reselection is successful, the information of the cells that are successfully reselected and the information of the cells a are recorded in a border reselection cell list according to the corresponding relationship, if the cells that are successfully reselected are cell 1, the corresponding relationship between the information of the cells a and the information of the cells 1 is recorded in the border reselection cell list, so that the border reselection cell list shown in the following table 4 can be obtained, and table 4 is as follows:

table 4: border reselection cell list

804. If the reselection is not successful, it is determined whether the reselection number is greater than X, if not, step 801 is executed, and if yes, step 805 is executed.

X is typically an integer greater than 1, such as: x=3, it means that the process of selecting back can be repeatedly performed 3 times by a timer of N seconds.

805. The back-select timer is set to 10N seconds and the back-select is initiated when the idle state continues for 10N seconds.

The 10N seconds herein is merely an example, as long as the time period for which the back-select timer initiates the back-select is prolonged.

806. It is determined whether the reselection is successful, if yes, step 803 is executed, otherwise step 804 is executed.

The above procedure indicates that when the selected cell is not selected, the selected cell can be selected back by the selected timer for multiple times, if the selected cell is determined, the information of the selected cell and the information of the cell A are recorded in the border selected cell list according to the corresponding relation, if the reselection timer times back for N seconds by X times and the reselection timer times back for 10N seconds by X times, a cell that can be reselected has not been selected yet, the reselection process may end.

In the embodiment of the application, if the border reselection cell list does not contain the information of the international roaming cell accessed by the terminal equipment on the network equipment, the terminal equipment can determine the reselection cell by initiating reselection in an idle state, so that reselection failure caused by that the border reselection cell list does not contain a proper reselection cell can be avoided, and the success rate of reselection is further improved.

In the embodiment of the application, besides the scheme for updating the border reselection cell list, the border reselection cell list can be updated through the cloud.

In the embodiment of the present application, except for the scheme described in fig. 8, optionally, in the embodiment of the present application, the terminal device receives a border reselection cell list from the cloud device, where the border reselection cell list is obtained by fusing border reselection cell lists sent by a plurality of terminal devices by the cloud device.

In the embodiment of the present application, cloud devices shown in fig. 9 may be used, for example: and updating the border reselection cell list by the cloud server.

As shown in fig. 9, the scenario includes a plurality of terminal devices, such as: terminal 1, terminal 2, …, terminal M, each of which can maintain a border reselection cell list, such as: the terminal device 1 maintains a border reselection cell list 1, the terminal device 2 maintains a border reselection cell list 2, …, the terminal device M maintains a border reselection cell list M, each terminal device can report the maintained border reselection cell list to a server of a cloud end, then the server sorts the border reselection cell lists to obtain a list warehouse, the list warehouse can be understood as an integrated list, then the server sends the list warehouse to each terminal device, and each terminal device can update the locally maintained border reselection cell list by using the list warehouse.

In addition, in the embodiment of the present application, the terminal device may also select back to the HPLMN network cell through the transformation of the internet protocol (internet protocol, IP) address, or through a manual search method, where the information of the selected cell and the information of the international roaming cell may also be recorded in the border selection cell list.

In the embodiment of the application, the border reselection cell list can be updated in various modes, so that the border reselection cell list is more perfect, and the terminal equipment can quickly reselect cells of the HPLMN network when the border roams to network equipment in other countries.

Having described the communication method of the terminal device, the following describes the corresponding terminal device, as shown in fig. 10, an embodiment of the terminal device 100 provided in the embodiment of the present application may include:

the receiving unit 1001 is configured to receive a system message sent by a network device, where the system message includes a border identifier, and information in the border identifier is used to indicate whether the network device is located at a border, and the terminal device is in an international roaming state. The receiving unit 1001 may perform step 301 in the foregoing method embodiment.

The first processing unit 1002 is configured to perform an international roaming reselection operation if the information in the border indicator indicates that the network device is located at a border. The first processing unit 1002 may perform step 302 in the method embodiment described above.

The second processing unit 1003 is configured to turn off the international roaming network reselection function if the information in the border indicator indicates that the network device is not located at the border. The second processing unit 1003 may perform step 303 in the foregoing method embodiment.

Optionally, if the information in the border identification indicates that the network device is located at a border, the system message further includes at least one mobile country code.

In the embodiment of the present application, at least one MCC included in the system message is the MCC of at least one neighboring country of the second country covered by the signal of the network device, and each country has one MCC. The terminal equipment can determine whether the processing strategy comprises the MCC of the first country to which the home network belongs according to the at least one MCC, thereby improving the accuracy of determining the processing strategy after the terminal equipment generates international roaming in the border

Optionally, the first processing unit 1002 is configured to perform the international roaming reselection operation if the information in the border indicator indicates that the network device is located in a border, and the at least one MCC includes a MCC of a first country, where the home network of the terminal device belongs to.

Optionally, the second processing unit 1003 is further configured to close the international roaming network reselection function if the at least one MCC does not include the MCC of the first country, where the home network of the terminal device belongs to.

Optionally, the first processing unit 1002 is configured to:

if the border reselection cell list contains information of international roaming cells accessed by the terminal equipment on the network equipment, determining reselection cells from the border reselection cell list, wherein the border reselection cell list comprises a corresponding relation between the information of the international roaming cells and the information of the reselection cells, and the reselection cells are cells which are successfully reselected from the international roaming cells.

And accessing the reselection cell.

Optionally, if the border reselection cell list includes information of a plurality of cells that are once reselected successfully corresponding to the information of the international roaming cell, the information of the reselected cell is the last cell added to the border reselection cell list in the information of the plurality of cells that are once reselected successfully, or the reselected cell is the cell with the strongest signal strength in the plurality of cells that are once reselected successfully.

Optionally, the first processing unit 1002 is configured to:

if the border reselection cell list does not contain the information of the international roaming cell accessed by the terminal equipment on the network equipment, the reselection is initiated in an idle state to determine the reselection cell;

and accessing the reselection cell.

Optionally, the first processing unit 1002 is further configured to add a correspondence between information of the international roaming cell and information of the reselection cell to a border reselection cell list.

Optionally, the receiving unit 1001 is further configured to receive a border reselection cell list from the cloud device, where the border reselection cell list is obtained by fusing border reselection cell lists sent by a plurality of terminal devices by the cloud device.

In this embodiment, the operations performed by the units in the terminal device are similar to those described in the embodiments shown in fig. 3 to 9, and may be understood with reference to the content of the foregoing method embodiment, which is not described herein.

In another embodiment of the present application, there is also provided a computer-readable storage medium having stored therein computer-executable instructions which, when executed by a processor of a device, perform the steps performed by the terminal device of fig. 3 to 9 described above.

In another embodiment of the present application, there is also provided a computer program product comprising computer program code for performing the steps performed by the terminal device in fig. 3 to 9 described above, when the computer program code is executed on a computer.

In another embodiment of the application, there is also provided a chip system including one or more interface circuits and one or more processors; the interface circuit and the processor are interconnected through a circuit; the interface circuit is used for receiving signals from the memory of the terminal equipment and sending signals to the processor, wherein the signals comprise computer instructions stored in the memory; when the processor executes the computer instructions, the terminal device performs the steps performed by the terminal device in fig. 3 to 9 described above. In one possible design, the chip system may further include a memory to hold program instructions and data necessary for the terminal device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.

When the integrated unit is implemented in software, it may 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. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Claims

1. A communication method of a terminal device, comprising:

the terminal equipment receives a system message sent by the network equipment, wherein the system message comprises a border identification bit, information in the border identification bit is used for indicating whether the network equipment is located at a border or not, and the terminal equipment is in an international roaming state;

if the information in the border identification indicates that the network equipment is located at the border, the terminal equipment executes international roaming reselection operation;

and if the information in the border identification indicates that the network equipment is not located at the border, the terminal equipment closes the international roaming network reselection function.

2. The communication method of claim 1, wherein the system message further comprises at least one mobile country code MCC if the information in the border indicator indicates that the network device is located at a border.

3. The communication method according to claim 2, wherein if the information in the border indicator indicates that the network device is located at a border, the terminal device performs an international roaming reselection operation, including:

and if the information in the border identification indicates that the network equipment is located at the border, and the at least one MCC comprises the MCC of a first country, the terminal equipment executes international roaming reselection operation, and the first country is the country to which the home network of the terminal equipment belongs.

4. The communication method according to claim 2, characterized in that the method further comprises:

if the at least one MCC does not include the MCC of the first country, the terminal equipment closes the international roaming network reselection function, and the first country is the country to which the home network of the terminal equipment belongs.

5. A communication method according to any of claims 1-3, characterized in that the terminal device performs an international roaming reselection operation, comprising:

if the border reselection cell list contains information of an international roaming cell accessed by the terminal equipment on the network equipment, the terminal equipment determines a reselection cell from the border reselection cell list, wherein the border reselection cell list comprises a corresponding relation between the information of the international roaming cell and the information of the reselection cell, and the reselection cell is a cell which is successfully reselected from the international roaming cell once;

and the terminal equipment accesses the reselection cell.

6. The communication method according to claim 5, wherein if the border reselection cell list includes information of a plurality of cells that have been successfully reselected corresponding to the information of the international roaming cell, the information of the reselected cell is the last cell to be added to the border reselection cell list in the information of the plurality of cells that have been successfully reselected, or the reselected cell is the cell with the strongest signal strength in the plurality of cells that have been successfully reselected.

7. A communication method according to any of claims 1-3, characterized in that the terminal device performs an international roaming reselection operation, comprising:

if the border reselection cell list does not contain the information of the international roaming cell accessed by the terminal equipment on the network equipment, the terminal equipment initiates reselection in an idle state to determine the reselection cell;

and the terminal equipment accesses the reselection cell.

8. The communication method according to claim 7, characterized in that the method further comprises:

and the terminal equipment adds the corresponding relation between the information of the international roaming cell and the information of the reselection cell into the border reselection cell list.

9. A method of communicating according to any of claims 5-8, wherein the method further comprises:

and the terminal equipment receives the border reselection cell list from the cloud equipment, wherein the border reselection cell list is obtained by fusing border reselection cell lists sent by a plurality of terminal equipment by the cloud equipment.

10. A terminal device, comprising:

a receiving unit, configured to receive a system message sent by a network device, where the system message includes a border identifier bit, where information in the border identifier bit is used to indicate whether the network device is located at a border, and the terminal device is in an international roaming state;

The first processing unit is used for executing international roaming reselection operation if the information in the border identification indicates that the network equipment is located at the border;

11. The terminal device of claim 10, wherein the system message further comprises at least one mobile country code MCC if the information in the border indicator indicates that the network device is located at a border.

12. The terminal device of claim 11, wherein the terminal device,

and the first processing unit is configured to execute an international roaming reselection operation if the information in the border identifier indicates that the network device is located in a border, and the at least one MCC includes a MCC of a first country, where the first country is a country to which the home network of the terminal device belongs.

13. The terminal device of claim 11, wherein the terminal device,

the second processing unit is further configured to close an international roaming network reselection function if the at least one MCC does not include a MCC of a first country, where the first country is a country to which the home network of the terminal device belongs.

14. Terminal device according to any of the claims 10-12, characterized in that,

the first processing unit is used for: if the border reselection cell list contains information of an international roaming cell accessed by the terminal equipment on the network equipment, determining a reselection cell from the border reselection cell list, wherein the border reselection cell list comprises a corresponding relation between the information of the international roaming cell and the information of the reselection cell, and the reselection cell is a cell which is successfully reselected from the international roaming cell; and accessing the reselection cell.

15. The terminal device of claim 14, wherein if the border reselection cell list includes information of a plurality of cells that have been successfully reselected corresponding to the information of the international roaming cell, the information of the reselected cell is the last cell to join the border reselection cell list in the information of the plurality of cells that have been successfully reselected, or the reselected cell is the cell with the strongest signal strength in the plurality of cells that have been successfully reselected.

16. Terminal device according to any of the claims 10-12, characterized in that,

the first processing unit is used for: if the border reselection cell list does not contain the information of the international roaming cell accessed by the terminal equipment on the network equipment, the reselection is initiated in an idle state to determine the reselection cell; and accessing the reselection cell.

17. The terminal device of claim 16, wherein the terminal device,

the first processing unit is further configured to add a correspondence between the information of the international roaming cell and the information of the reselection cell to the border reselection cell list.

18. Terminal device according to any of the claims 14-17, characterized in that,

the receiving unit is further configured to receive the border reselection cell list from a cloud device, where the border reselection cell list is obtained by fusing border reselection cell lists sent by a plurality of terminal devices by the cloud device.

19. A terminal device, comprising: a transceiver, a processor and a memory, the transceiver and the processor being coupled with the memory, the memory being for storing a program or instructions that, when executed by the processor, cause the terminal device to perform the method of any of claims 1 to 9.

20. A chip system comprising one or more interface circuits and one or more processors; the interface circuit and the processor are interconnected through a circuit; the interface circuit is configured to receive a signal from a memory of the electronic device and to send the signal to the processor, the signal including computer instructions stored in the memory; the system on a chip performs the method of any one of claims 1 to 9 when the processor executes the computer instructions.

21. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein instructions, which when run on a terminal device, cause the terminal device to perform the method of any of claims 1 to 9.

22. A computer program product, characterized in that the computer program product comprises computer program code which, when run on a computer, causes the computer to perform the method according to any one of claims 1 to 9.