CN111491341B

CN111491341B - Cell reselection method and terminal

Info

Publication number: CN111491341B
Application number: CN201910087399.4A
Authority: CN
Inventors: 史纳; 魏洪康; 汤超; 孟选军; 李鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-29
Filing date: 2019-01-29
Publication date: 2022-08-26
Anticipated expiration: 2039-01-29
Also published as: CN111491341A

Abstract

The embodiment of the application provides a cell reselection method and a terminal, relates to the technical field of communication, and can reselect other cells under the condition that a serving cell where the terminal resides currently is not configured with an adjacent cell. The specific scheme is as follows: in an idle state, if the terminal determines that the resident serving cell is not configured with an adjacent cell, the terminal searches for the cell; and if the terminal searches the target cell meeting the residence condition, reselecting and residing in the target cell by the terminal. The embodiment of the application is used for cell reselection.

Description

Cell reselection method and terminal

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a cell reselection method and a terminal.

Background

In a mobile communication system, a terminal may include two states, i.e., a connection state when an RRC connection is established and an idle state when the RRC connection is not established, according to whether a Radio Resource Control (RRC) connection is established with a mobile communication network. In an idle state, the terminal can perform cell reselection and select an adjacent cell with better performance for residing; and if the serving cell in which the terminal currently resides is not configured with the adjacent cell, the terminal remains to reside in the current serving cell.

Generally, when a serving cell in which a terminal currently resides is not configured with a neighboring cell, a signal of the serving cell is unstable, resulting in impaired traffic of a user.

Disclosure of Invention

The embodiment of the application provides a cell reselection method and a terminal, and other cells can be reselected under the condition that a serving cell where the terminal currently resides is not configured with an adjacent cell.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in one aspect, an embodiment of the present application provides a cell reselection method, including: in an idle state, if the terminal determines that the resident serving cell is not configured with an adjacent cell, the terminal performs cell search. And if the terminal searches the target cell meeting the residence condition, reselecting and residing in the target cell by the terminal.

In the scheme, when the serving cell where the terminal resides is not configured with a neighboring cell and is an island cell, the terminal may automatically search for a target cell that meets the residence condition, thereby reselecting another cell and leaving the island cell, which is different from the rule of 3GPP protocol for cell reselection.

In a possible implementation manner, in an idle state, before the terminal performs cell search if the terminal determines that the camped serving cell is not configured with the neighboring cell, the method further includes: the terminal determines that the signal quality of the camped serving cell is lower than or equal to a first preset value.

That is, if the signal quality of the serving cell in which the terminal resides is lower than a preset value, the terminal may determine whether the serving cell is an island cell.

In another possible implementation manner, the performing, by the terminal, cell search includes: and the terminal searches the cells according to at least one history frequency point which is successfully registered before, wherein each frequency point corresponds to at least one cell. If the terminal searches a target cell meeting the residence condition, the terminal reselects and resides in the target cell, and the method comprises the following steps: and if the terminal successfully searches the target cell meeting the residence condition according to the historical frequency point, reselecting and residing the target cell by the terminal. And the residence condition comprises that the signal quality of the frequency point corresponding to the target cell is higher than a second preset value.

In the scheme, if the serving cell in which the terminal resides is an island cell, the terminal may search for other cells with higher signal quality according to the historical frequency points, so that the terminal may reselect to other cells.

In another possible implementation manner, the performing, by the terminal, cell search further includes: and if the terminal does not search the target cell meeting the residence condition according to the historical frequency points, the terminal searches the cell according to all the frequency bands supported by the terminal. If the terminal searches a target cell meeting the residence condition, the terminal reselects and resides in the target cell, and the method further comprises the following steps: and if the terminal successfully searches the target cell meeting the residence condition according to all the frequency bands supported by the terminal, reselecting and residing in the target cell by the terminal.

In the scheme, if the serving cell in which the terminal resides is an island cell and the terminal does not search a reselectable cell according to the historical frequency points, the terminal can search other cells with higher signal quality according to all frequency bands supported by the terminal, so that the other cells can be reselected.

In another possible implementation manner, the cell search performed by the terminal according to all frequency bands supported by the terminal includes: and the terminal searches the cells according to the sequence of the 4G network frequency point, the 3G network frequency point and the 2G network frequency point in all the frequency bands supported by the terminal.

Because the number of the 4G cells is large and the number of the 2G cells is small at present, the searching is carried out according to the sequence of the 4G network, the 3G network and the 2G network, the rate of searching the cells can be improved, the rate of searching the target cells is improved, and the processing efficiency is improved.

In another possible implementation manner, after determining that the serving cell is not configured with the neighboring cell, the terminal may mark the serving cell as a first cell, where the first cell is an island cell.

Therefore, according to the mark of the island cell, the mobile phone can be prevented from subsequently entering the island cell again.

In another possible implementation, after determining that the serving cell is not configured with the neighboring cell, the terminal may mark the serving cell as a first cell, and set a preset duration T corresponding to the first cell, where the preset duration T may also be referred to as a penalty period T.

Therefore, according to the mark of the island cell and the preset duration T, the mobile phone can be prevented from entering the island cell again in the punishment period T subsequently.

In another possible implementation manner, the cell search performed by the terminal according to all frequency bands supported by the terminal includes: the terminal searches cells according to other frequency points except the frequency point corresponding to the first cell and the historical frequency point in all frequency bands supported by the terminal; the first cell is a cell which is not configured with an adjacent cell, or the first cell is determined not to be configured with an adjacent cell within a preset time period T.

Therefore, the terminal can skip the searching of the historical frequency points according to the searching of all the frequency bands, and resource waste caused by repeated searching is avoided; searching for the island cell or the island cell within a punishment period can be skipped so as to avoid the terminal from reselecting the island cell.

In another possible implementation, the camping condition includes that the target cell is not a first cell, and the first cell is a cell configured with no neighboring cell.

In this way, the terminal can no longer reselect to an islanding cell.

In another possible implementation, the camping condition includes that the target cell is determined not to be configured with the neighboring cell before the preset time period T.

In this way, the terminal can not reselect to an island cell within the punishment period T.

In another possible implementation, the method further includes: and if the terminal does not search the target cell meeting the residence condition, the terminal continuously resides in the serving cell.

In another possible implementation manner, the determining, by the terminal, that the camped serving cell is not configured with a neighboring cell includes: the terminal acquires the first information from at least one of system information, a Radio Resource Control (RRC) connection reconfiguration message or a measurement control message. The terminal determines whether the first information includes information of neighbor cells of the serving cell. If the first information does not include the information of the adjacent cell, the terminal determines that the resident serving cell is not configured with the adjacent cell.

In this way, the terminal can determine whether the serving cell is configured with the neighboring cell according to whether information of the neighboring cell of the serving cell is included in the information acquired from the network side device such as the base station.

In another possible implementation manner, the method further includes: if the first information includes information of the neighboring cell, the serving cell where the terminal resides is configured with the neighboring cell. And if the target adjacent cell meeting the reselection condition exists in the adjacent cells, reselecting and residing in the target adjacent cell by the terminal. And if the target adjacent cell meeting the reselection condition does not exist in the adjacent cells, the terminal continuously resides in the serving cell.

In this way, when the serving cell where the terminal resides is configured with a neighboring cell, the cell phone may reselect to a neighboring cell that satisfies the residence condition.

In another possible implementation manner, after the timer T corresponding to the cell marked as the islanding cell expires, the terminal may cancel the marking that the cell is the islanding cell.

In another possible implementation manner, if the serving cell where the terminal is currently located is previously marked as an islanding cell, but it is determined that the serving cell is configured with a neighboring cell this time, the terminal may cancel the marking that the serving cell is an islanding cell.

In another aspect, an embodiment of the present application provides an apparatus for reselecting a cell, where the apparatus is included in a terminal, and the apparatus has a function of implementing a terminal behavior in the foregoing aspects and possible implementations. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the above-described functions. For example, a determination module or unit, a search module or unit, a processing module or unit, etc.

In another aspect, embodiments of the present application provide a terminal including one or more processors and one or more memories. The one or more memories are coupled to the one or more processors and the one or more memories are configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the terminal to perform the method of cell reselection in any of the above aspects and any possible implementation.

In another aspect, an embodiment of the present application provides a computer storage medium, which includes computer instructions, and when the computer instructions are executed on a computer, the computer is caused to perform a method for cell reselection performed by a terminal in any of the foregoing aspects and any possible implementation.

In another aspect, embodiments of the present application provide a computer program product, which when run on a computer, causes the computer to perform a method for cell reselection performed by a terminal in any of the above aspects and any possible implementation.

Drawings

Fig. 1 is a schematic diagram illustrating a cell reselection rule according to an embodiment of the present application;

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

fig. 3 is a schematic structural diagram of cell reselection according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of an interface provided in an embodiment of the present application;

fig. 5 is a schematic flowchart of searching for a target cell according to an embodiment of the present application;

FIG. 6 is a schematic view of another interface provided by an embodiment of the present application;

fig. 7 is a schematic structural diagram of another terminal according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

After the terminal is powered on, or after the terminal moves from a blind area to a coverage area of a Public Land Mobile Network (PLMN), all frequency points allowed by the PLMN are searched, and a suitable cell is selected as a serving cell, which may be referred to as cell selection.

After executing the cell selection, in an idle state, the terminal is resided in the serving cell and performs cell reselection to select a better cell for residence; and monitoring a paging channel to ensure that the terminal can be paged. When the terminal monitors that the paging needs to carry out voice calling and receives and sends short messages; or the user actively triggers the data service to surf the internet; or when the position is moved to trigger the services such as position updating, the RRC connection is initiated, thereby entering a connection state. After the terminal executes the service, the network side (e.g., the base station) actively releases the RRC connection, and the terminal returns to an idle state and resides in the serving cell.

The 3rd generation partnership project (3 GPP) protocol specifies that a serving cell must have a neighboring cell (also called a neighbor cell) as a precondition for cell reselection. The adjacent cell is a cell overlapping with the current cell and having a handover relationship, and one cell may have a plurality of adjacent cells. Specifically, the 4G serving cell reselection protocol standard may be referred to in section 5.2 of the 3GPP TS 36.304 v13.2.0 protocol, the 3G serving cell reselection protocol standard may be referred to in section 5.2 of the 3GPP TS 25.304 v3.3.0 protocol, and the 2G serving cell reselection protocol standard may be referred to in section 6.6 of the 3GPP TS 45.008 v8.3.0 protocol.

According to the specification of the 3GPP protocol, the reselection rule of the cell can be seen in fig. 1. If the serving cell where the terminal resides is configured with the same-frequency neighboring cells, the reselection rule of the same-frequency neighboring cells includes: the terminal determines whether to start co-frequency measurement by comparing the parameter S of the serving cell with the parameter Sintrasearch in the system broadcast; and performing R criterion sequencing on the adjacent cells according to the signal quality, then selecting the optimal cell with the best performance such as signal quality from the adjacent cells, and reselecting the optimal cell. Wherein, the specific principle and specific parameter meaning of measurement initiation can refer to 3GPP TS 36.304 v13.2.0 protocol.

The constraint conditions to be met in the sorting and selecting process comprise: the time that the terminal resides in the serving cell exceeds 1s (second), and the sorting time of the adjacent cells is greater than the reselection trigger time (Treselection).

Different frequency points can correspond to different priorities, and correspondingly, adjacent cells corresponding to different frequency points can also correspond to different priorities. If the serving cell is configured with a neighboring cell of the pilot frequency, the pilot frequency cell reselection rule includes: for the frequency points of the neighboring cells indicated by the system message to have higher priority than the frequency points of the serving cell (i.e. the frequency points with high priority), the terminal should always perform the measurement on the frequency points of the neighboring cells. For the frequency points of the adjacent cells with the priority equal to or lower than that of the serving cell (i.e. the frequency points with the same priority or the frequency points with low priority) indicated by the system message, the measurement criteria of the terminal include: if the S value of the serving cell is greater than Snoninthasearch, not executing the measurement of the frequency points of the adjacent cell; and if the S value of the serving cell is less than or equal to Snonintrasearch, performing measurement on the frequency points of the adjacent cell.

The reselection of the adjacent cell corresponding to the frequency point with high priority is carried out after the following conditions are met: the S value of the adjacent cell corresponding to the high-priority frequency point is greater than a preset first threshold value, and the duration time exceeds Treselection; the terminal resides in the serving cell for more than 1 s. And the terminal selects the optimal cell corresponding to the frequency point with the highest priority from the frequency points of the adjacent cells with the higher priorities than the frequency point of the service cell, and reselects the optimal cell.

And for the reselection of the adjacent cells corresponding to the frequency points with the same priority, performing reselection operation by adopting an R criterion of reselection of the cells with the same frequency.

And for the reselection of the adjacent cell corresponding to the frequency point with low priority, the reselection is carried out after the following conditions are met: the adjacent cells corresponding to the frequency points without high priority accord with the reselection requirement; and the adjacent cells corresponding to the frequency points without the equal priority accord with the reselection requirement; the S value of the service cell is smaller than a preset second threshold value, the S value of an adjacent cell corresponding to the frequency point with low priority is larger than the preset second threshold value, and the duration time exceeds Treselection; the terminal resides in the serving cell for more than 1 s. And the terminal selects the optimal cell corresponding to the frequency point with the highest priority from the frequency points of the adjacent cells with the priority lower than that of the serving cell, and reselects the optimal cell.

As known from the relevant specifications for cell reselection according to 3GPP protocols, a precondition for cell reselection is that the serving cell must be configured with neighboring cells. When the terminal reselects the cell in an idle state, the configured information of the adjacent cell is obtained from the system message of the service cell or the RRC connection reconfiguration message or the measurement control message when the terminal enters the connected state last time, so that the better adjacent cell is selected to reside according to the information of the adjacent cell, and the surrounding available cells are not actively searched. If the serving cell is not configured with a neighboring cell, the cell reselection premise specified by the 3GPP protocol cannot be met, and thus, other better cells cannot be reselected.

The information of the neighboring cells of the serving cell may be configured by the access network device, such as the base station. For example, in a 4G network, the base station may be an eNodeB; in a 3G network, the base station may be a NodeB; in a 2G network, the base station may include a Base Transceiver Station (BTS), a Base Station Controller (BSC), and the like.

In a mobile communication network, there are some situations that the cell planning is not reasonable, and some cells are not configured with any neighboring cells, and a cell not configured with a neighboring cell may be referred to as an island cell. At present, if a terminal resides in an island cell once, since an adjacent cell is not configured, the premise of cell reselection specified by a 3GPP protocol cannot be met, other cells with better quality cannot be reselected, and the terminal cannot leave the island cell, so that the terminal can only continue to reside in the island cell; the signal quality of the islanding cell is unstable, which may cause the terminal to not monitor paging normally, thereby causing the service of the user to be damaged.

The embodiment of the application provides a cell reselection method, which can be applied to a terminal. In an idle state, if the serving cell in which the terminal currently resides is not configured with an adjacent cell, the serving cell is an islanding cell, and the terminal cannot reselect the adjacent cell according to a 3GPP protocol, the terminal may search for a target cell meeting a residence condition according to a history frequency point successfully registered before or according to a full frequency band supported by the terminal, so that the target cell can be reselected and reside, the target cell leaves the currently residing islanding cell, the service of a user is prevented from being damaged, and the use experience of the user is improved.

The full frequency band supported by the terminal refers to a frequency range that the terminal can transmit and receive information in the mobile communication process, that is, all frequency bands supported by the terminal.

The terminal may be a mobile phone, a tablet computer, a wearable device, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and other electronic devices, and the embodiment of the present application does not limit the specific type of the terminal.

Illustratively, fig. 2 shows a schematic structural diagram of the terminal 100. The terminal 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a Subscriber Identity Module (SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

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

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

The controller may be, among other things, a neural center and a command center of the terminal 100. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

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

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

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

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

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

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

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

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

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

It should be understood that the interface connection relationship between the modules illustrated in the embodiments of the present application is only an exemplary illustration, and does not limit the structure of the terminal 100. In other embodiments of the present application, the terminal 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

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

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

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

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

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

The mobile communication module 150 (for example, a baseband chip) may also search for a target cell meeting a residence condition according to a history frequency point successfully registered before the mobile phone or according to a full frequency band supported by the terminal when the serving cell where the terminal 100 resides currently is not configured with an adjacent cell, that is, the serving cell is an islanded cell, so that the mobile phone reselects and resides in the target cell and leaves the islanded cell.

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

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

In some embodiments, the antenna 1 of the terminal 100 is coupled to the mobile communication module 150 and the antenna 2 is coupled to the wireless communication module 160 so that the terminal 100 can communicate with a network and other devices through a wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), General Packet Radio Service (GPRS), code division multiple access (code division multiple access, CDMA), Wideband Code Division Multiple Access (WCDMA), time-division code division multiple access (time-division code division multiple access, TD-SCDMA), Long Term Evolution (LTE), LTE, BT, GNSS, WLAN, NFC, FM, and/or IR technologies, among others. GNSS may include Global Positioning System (GPS), global navigation satellite system (GLONASS), beidou satellite navigation system (BDS), quasi-zenith satellite system (QZSS), and/or Satellite Based Augmentation System (SBAS).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The following embodiments will describe the method for cell reselection provided in the embodiments of the present application, taking the terminal 100 as a handset as an example. Referring to fig. 3, the method may include:

300. in the idle state, the handset resides in the serving cell.

301. The mobile phone determines that the signal quality of the serving cell is lower than a first preset value.

The parameter used for representing the signal quality of the cell may include, but is not limited to, one or more of the following: reference Signal Receiving Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Receiving Quality (RSRQ), received signal level (Rxlev), and the like.

If the mobile phone determines that the signal quality of the serving cell is lower than the first preset value, a process of determining whether the serving cell is configured with the neighboring cell may be triggered. That is, the condition that the signal quality of the serving cell is lower than the first preset value is the trigger condition for the handset to perform step 302. Other conditions for triggering the mobile phone to execute step 302 may be provided, and the embodiment of the present application is not limited.

Specifically, if the mobile phone enters a serving cell by reselection in an idle state and the signal quality of the serving cell is lower than a first preset value within a continuous time T1, the mobile phone may be triggered to execute step 302; or, if the mobile phone enters a serving cell through switching in the connected state, and after the mobile phone service is finished and returns to the idle state, and the signal quality of the serving cell in a continuous time T1 in the idle state is all lower than the first preset value, the mobile phone may be triggered to execute step 302.

302. The handset determines whether the serving cell is configured with a neighboring cell. If the neighboring cell is configured, go to step 303; if no neighboring cell is configured, go to step 306.

The mobile phone may obtain the first information from at least one of system information, a radio resource control, RRC, connection reconfiguration message, or a measurement control message. The first information may be an information list of the neighboring cell, and the mobile phone may determine whether the currently camped serving cell is configured with the neighboring cell according to the first information.

Specifically, the mobile phone may obtain the system information of the camped serving cell from a network side device (e.g., an access network device such as a base station) in an idle state. If the system information includes second information, which is information of a neighboring cell of the current serving cell, the mobile phone may update the first information according to the second information. The mobile phone can also acquire an RRC connection reconfiguration message or a measurement control message from the network side equipment in the connection state. If the RRC connection reconfiguration message or the measurement control message includes third information, where the third information is information of a neighboring cell of the current serving cell, the mobile phone may update the first information according to the third information. Then, the handset can also be switched from the connected state to the idle state, so as to stay in the serving cell.

In an idle state, the mobile phone may determine whether the currently camped serving cell is configured with the neighboring cell according to whether the first information includes information of the neighboring cell.

The neighboring cells of the serving cell may be the same-system and same-frequency cells, the same-system and different-frequency cells, or different-system cells of the serving cell. The system can include 4G network system, 3G network system, 2G network system, 5G network system, etc. The 4G network system may include an LTE system, the 3G network system may include a Universal Mobile Telecommunications System (UMTS), an evolved Universal Terrestrial Radio Access Network (UTRAN) system, and the like, and the 2G network system may include a global system for mobile communications (GSM), and the like. The information of the neighboring cell of the serving cell is used to identify the neighboring cell, and specifically may be identification information of the neighboring cell, or may also be frequency point information corresponding to the neighboring cell, or frequency band information corresponding to the neighboring cell, and the like.

For example, in the first information, the second information, and the third information, information of a neighboring cell of the serving cell is frequency point information corresponding to the neighboring cell. The frequency points of the adjacent cells comprise the frequency points of the adjacent cells of each mobile communication network (such as 4G, 3G and 2G). The following illustrates how the mobile phone acquires the frequency points of the neighboring cells of the 4G, 3G, 2G networks of the serving cell.

(1) And the mobile phone acquires the frequency points of the 4G adjacent cells.

For example, if the mobile phone is currently registered in the 4G network, in an idle state, the mobile phone may obtain the frequency points of the common-frequency 4G neighboring cells from IE 'intraFreqNeighCellList' in the system message systemlnformationblocktype 4, and obtain the frequency points of the different-frequency 4G neighboring cells from IE 'intrafreqncarrierfreqlisti' in the system message systemlnformationblocktype 5; in the connected state, the mobile phone may obtain the frequency points of the 4G neighboring cells from IE 'MeasObjectEUTRA' in the RRC connection reconfiguration message RRCConnectionReconfiguration, which may include the frequency points of the same-frequency 4G neighboring cells and the frequency points of different-frequency 4G neighboring cells. It can be understood that, in the idle state and the connected state, the mobile phone may further obtain the frequency points of the neighboring cells of the different systems, which is not described herein.

For example, if the mobile phone is currently registered in the 3G network, in an idle state, the mobile phone may obtain the frequency points of the neighboring cells of the inter-system 4G from IE 'MeasurementControlSystemInformation' in the system message SystemInformationBlocktype 19; in a connected state, the mobile phone may obtain the frequency points of the 4G neighboring cells from IE 'Inter-frequency' in the measurement control message measurement control.

For example, if the mobile phone is currently registered in the 2G network, in an idle state, the mobile phone may obtain the frequency point of the 4G neighboring cell from IE '3 GNeighbourCellDescription' in the system message systemlnformatietype 2 quater; in a connected state, the mobile phone may obtain the frequency points of the 4G neighboring cells from the IE 'Inter-RAT' in the measurement control message measurement control.

(2) And the mobile phone acquires the frequency points of the 3G adjacent cells.

For example, if the mobile phone is currently registered in the 4G network, in an idle state, the mobile phone may acquire a frequency point of a 3G neighbor cell from IE 'carrierFreqListUTRA-FDD' or 'carrierFreqListUTRA-TDD' in the system message systemlnformationblocktype 6; in the connected state, the handset may acquire the frequency points of the 3G neighbor cells from IE 'MeasObjectUTRA' in the RRC connection reconfiguration message RRCConnectionReconfiguration.

For example, if the mobile phone is currently registered in the 3G network, in an idle state, the mobile phone may obtain a frequency point of a 3G neighboring cell from IE 'MeasurementControlSystemInformation' in a system message SystemInformationBlocktype 11; in a connected state, the mobile phone may obtain the frequency point of the 3G neighboring cell from IE 'Inter-frequency' in the measurement control message measurement control.

For example, if the mobile phone is currently registered in the 2G network, in an idle state, the mobile phone may obtain the frequency points of the 3G neighboring cells from IE '3 GNeighbourCellDescription' in the system message systemlnformationtype 2 quater; in a connected state, the mobile phone may obtain the frequency point of the 3G neighboring cell from IE 'Inter-RAT' in the measurement control message measurement control.

(3) And the mobile phone acquires the frequency points of the 2G adjacent cells.

For example, if the mobile phone is currently registered in the 4G network, in an idle state, the mobile phone may obtain the frequency point of the 2G neighbor cell from IE 'carrierfreqinfogeran' in the system message systemlnformationblocktype 7; in the connected state, the handset may acquire the frequency point of the 2G neighbor cell from IE 'MeasObjectGERAN' in the RRC connection reconfiguration message RRCConnectionReconfiguration.

For example, if the mobile phone is currently registered in the 3G network, in an idle state, the mobile phone may obtain the frequency point of the 2G neighboring cell from IE 'Inter-rat analysis systemlnformation' in the system message systemlnformationblocktype 11; in a connected state, the mobile phone may obtain the frequency point of the 2G neighboring cell from IE 'Inter-RAT' in the measurement control message measurement control.

For example, if the mobile phone is currently registered in the 2G network, in an idle state, the mobile phone may obtain the frequency point of the 2G neighboring cell from IE 'BCCHFrequencyList' in the system message systemlnformationtype 2; when in a connected state, the mobile phone may obtain the frequency point of the 2G neighboring cell from IE 'Inter-frequency' in the measurement control message measurement control.

In one implementation of step 302, the handset may first determine whether the serving cell is configured with a 4G neighbor cell; if the 4G adjacent cell is not configured, whether a 3G adjacent cell is configured is determined again; and if the 3G adjacent cell is not configured, determining whether a 2G adjacent cell is configured again. If the 4G adjacent cell, the 3G adjacent cell or the 2G adjacent cell exists, the mobile phone determines that the serving cell is configured with the adjacent cell, and the serving cell is not an island cell. If the 4G adjacent cell, the 3G adjacent cell and the 2G adjacent cell do not exist, the mobile phone determines that the service cell is not configured with the adjacent cell, and the service cell is an island cell.

Since the deployment of 4G cells is dense, the number of 3G cells is in the middle, and the number of 2G cells is small, if the serving cell is configured with a neighboring cell, the probability that the neighboring cell is a 4G cell is the largest. Therefore, when the mobile phone performs step 302, it may generally determine that the current serving cell is configured with the 4G neighboring cell, so as to determine that the serving cell is configured with the neighboring cell, thereby completing step 302; without the need to determine whether there are 3G and 2G neighbor cells, the processing efficiency can be improved.

In addition, if the mobile phone determines that the currently-resident serving cell is not configured with an adjacent cell according to the first information, the mobile phone can also prompt the user in a display information prompt mode, a sound prompt mode, a vibration prompt mode or an indicator light prompt mode, and the currently-resident serving cell is an island cell, so that the user can know that the current signal is possibly unstable. For example, referring to fig. 4, the mobile phone may prompt the user that the currently camped serving cell is an island cell through a pop-up window 401, and a signal of the mobile phone may be unstable.

303. The mobile phone determines whether there is a target neighboring cell satisfying a reselection condition among the configured neighboring cells. If yes, go to step 304; if not, go to step 305.

If the mobile phone determines that the serving cell currently camped on is configured with one or more neighboring cells according to the first information, the mobile phone may reselect the neighboring cell according to the information of the neighboring cell according to relevant provisions in the existing 3GPP protocol. The reselection procedure may follow the re-regulation and reselection procedure shown in fig. 1, and will not be repeated here.

When executing the cell reselection process, the mobile phone may measure the signal of the frequency point according to the frequency point of the adjacent cell in the first information, so as to determine whether the adjacent cell corresponding to the frequency point meets the reselection condition and is the target adjacent cell according to the signal obtained by measurement. For example, the reselection condition may include that the signal quality of the neighboring cell is higher than or equal to a preset threshold. Based on the reselection condition, if the mobile phone determines that the signal quality of a certain neighboring cell is higher than or equal to the preset threshold according to the frequency point of the neighboring cell in the first information, the neighboring cell may be a target neighboring cell, and the mobile phone may execute step 304, thereby reselecting the target neighboring cell and residing in the target neighboring cell. It can be understood that the contents of the reselection condition may be various, and specifically refer to relevant specifications in the 3GPP protocol, which is not described herein again.

304. And the mobile phone reselects and resides in the target adjacent cell.

305. The handset continues to camp on the current serving cell.

And if the mobile phone determines that no target adjacent cell meeting the reselection condition exists in the configured adjacent cells according to the first information, the mobile phone continues to reside in the current serving cell.

306. And the mobile phone searches whether a target cell meeting the residence condition exists according to the history frequency point successfully registered before or according to the full frequency band supported by the mobile phone. If the target cell meeting the resident condition is searched, executing step 307; if the target cell satisfying the camping condition is not searched, step 305 is executed.

If the mobile phone determines in step 302 that the serving cell is not configured with an adjacent cell, the relevant specification of the reselection is different from that of the 3GPP protocol, and in one scheme, the mobile phone may automatically perform cell search according to a history frequency point successfully registered before or according to a full frequency band supported by the mobile phone (i.e., all frequency bands supported by the mobile phone), so as to determine whether a target cell meeting a camping condition exists.

In another scheme, the mobile phone may further prompt the user whether to search for another cell meeting the camping condition, and after detecting the handover instruction indicated by the user, the mobile phone performs step 306. For example, referring to fig. 4, the mobile phone prompts the user whether to search for a cell for cell reselection through a pop-up window 401, and the mobile phone performs step 306 after detecting that the user clicks a control 402; after detecting the operation of the user clicking the control 403, the mobile phone does not execute step 306, and remains in the island cell where the mobile phone is currently located.

The residence condition can be set according to actual needs, and the performance of the target cell meeting the residence condition is better than that of the current serving cell. For example, the performance of a cell may include signal quality, signal-to-noise ratio, and the like. For example, the camping condition may include that the signal quality of the target cell is higher than or equal to a second preset value. Based on the camping condition, if the cell with the signal quality higher than or equal to the second preset value is searched by the mobile phone according to the previous successfully registered historical frequency point or according to the full frequency band supported by the mobile phone, the cell is the target cell, and the mobile phone may execute step 307 to reselect and camp on the target cell. As another example, the camping condition may include that the signal quality of the target cell is higher than or equal to the signal quality of the serving cell. The resident condition may also include other contents, and the embodiment of the present application is not limited thereto.

307. And the mobile phone reselects and resides in the target cell.

If the serving cell where the mobile phone currently resides is not configured with an adjacent cell and the serving cell is an islanding cell, the mobile phone may reselect and reside in another cell through steps 306 and 307, so as to leave the islanding cell, thereby avoiding the service of the user from being damaged.

In addition, if the mobile phone reselects and resides in the target cell, the mobile phone can also prompt the user that the user leaves the island cell through display information prompt, sound prompt, vibration prompt or indicator light prompt and other modes. For example, referring to fig. 6, the handset may prompt the user that the user currently leaves the island cell through a prompt 601.

In the embodiment of the present application, each cell may correspond to one or more frequency points. A frequency bin is a number for a set of fixed frequencies. For example, the frequency band 890MHz to 915MHz of the GSM900 may be divided into 125 radio frequency segments according to the frequency interval of 300KHz, each frequency segment is numbered, and the numbers of these fixed frequencies are frequency points. The historical frequency points successfully registered by the mobile phone before are the frequency points corresponding to the cells successfully registered by the mobile phone before, and the cells corresponding to the frequency points are usually the cells with better performance. Moreover, the number of historical frequency points stored in the mobile phone is usually small. For an example, the historical frequency points for which the handset has successfully registered before can be seen in table 1.

TABLE 1

Network system	Frequency band	Frequency point
			TD-LTE	Band38	37950
TD-LTE	Band39	38600
			TD-LTE	Band40	39450
…	…	…

In step 306, the mobile phone may first search for a signal corresponding to the historical frequency point (i.e., attempt to receive a signal corresponding to the historical frequency point) according to the stored historical frequency point that has been successfully registered before, so as to find an available cell. The signal corresponding to a certain frequency point is a signal received/transmitted by adopting the frequency corresponding to the frequency point. If the mobile phone searches for the signal corresponding to the historical frequency point (namely the mobile phone receives the signal corresponding to the historical frequency point), determining whether the cell corresponding to the historical frequency point is a target cell meeting the residence condition or not according to the signal corresponding to the historical frequency point.

For example, the camping condition includes that the signal quality of the cell to be reselected is higher than or equal to a second preset value. If the mobile phone searches for a signal corresponding to a certain historical frequency point and determines that the signal quality of the signal corresponding to the historical frequency point is higher than a second preset value, the cell corresponding to the historical frequency point meets the residence condition, and the cell corresponding to the historical frequency point is the target cell.

In one scheme, the cell can be searched by the mobile phone in the sequence of searching the 4G network frequency point, then searching the 3G network frequency point, and then searching the 2G network frequency point in the historical frequency points, so that the 4G cell and the 3G cell are preferably reselected as much as possible.

In step 306, if the cell phone does not successfully search the target cell meeting the residence condition according to the previously successfully registered historical frequency point, the cell phone may search a signal corresponding to the frequency point according to the frequency point in the full frequency band supported by the cell phone, and determine whether the cell corresponding to the frequency point is the target cell meeting the residence condition. For an example, the full band supported by the handset can be seen in table 2 below. This search process is explained below.

TABLE 2

Where Band (Band) is a frequency range specified by a mobile communication protocol. Such as Band38 in the 2570-2620 MHz corresponding protocol. Taking LTE FDD bands 1-Band 5 as an example, the correlation between frequency bands, frequencies and frequency points can be seen in table 3 below.

TABLE 3

Frequency band	Frequency range	Frequency point range
			B1	2110-2170MHZ	0-599
B2	1930-1990MHZ	600-1199
			B3	1805-1880MHZ	1300-1949
B4	2110-2155MHZ	1950-2399
			B5	869-894MHZ	2400-2649

In one scheme, the handset may search (or scan) signals (i.e., attempt to receive signals) for available cells in order of frequency bands from low to high or from high to low among the full frequency bands supported by the handset. For example, the mobile phone searches B1, then B2, and then B3, etc. When searching a certain frequency band, the mobile phone can scan all frequency points in the frequency band to determine whether signals corresponding to the certain frequency point can be received. If the mobile phone searches for a signal corresponding to a certain frequency point in the full frequency band (i.e. receives the signal corresponding to the frequency point), it is determined whether the cell corresponding to the frequency point is a target cell meeting the residence condition according to the signal corresponding to the frequency point.

The frequency points in the full frequency band supported by the mobile phone may include a 4G network frequency point, a 3G network frequency point, and a 2G network frequency point. In another scheme, referring to fig. 5, the mobile phone may first perform step 501 to search for a 4G network frequency point in the supported full frequency band to determine whether a 4G target cell exists; if the target cell is not searched, then step 502 is executed to search the 3G network frequency point so as to determine whether the 3G target cell exists; if the target cell is not searched, step 503 is executed to search the 2G network frequency point again to determine whether the 2G target cell exists. At present, because the number of 4G cells is usually greater than that of 3G cells, and the number of 3G cells is usually greater than that of 2G cells, when performing cell search according to this order, a mobile phone can generally search for a target cell satisfying a camping condition faster, so that processing efficiency can be improved.

The whole frequency band supported by the mobile phone also comprises historical frequency points. In another scheme, if the mobile phone searches according to the history frequency points before searching according to the supported full frequency band, the mobile phone can skip the search of the history frequency points when performing cell search according to the supported full frequency band, and search signals corresponding to other frequency points except the history frequency points, so as to avoid resource consumption caused by repeated search of the history frequency points.

In this embodiment of the application, after the mobile phone determines that the serving cell is not configured with the neighboring cell according to the first information in step 302, the mobile phone may further mark the serving cell to indicate that the serving cell is an island cell. In the embodiments of the present application, an islanding cell may also be referred to as a first cell, i.e. the first cell is not configured with a neighboring cell. For example, the mobile phone may store a list of islanding cells, and if the serving cell is an islanding cell, the mobile phone may add the serving cell to the list; as another example, the cell phone may mark the serving cell as an "island cell"; for another example, the handset may mark the serving cell as an islanding cell by a preset character (e.g., character "1") in a preset field. In addition, the mobile phone can also mark the frequency point corresponding to the serving cell to indicate that the cell corresponding to the frequency point is an island cell.

In an embodiment, on the basis that the cell phone marks frequency points of an island cell and an island cell, the reselection condition in step 303 may include that the target neighboring cell is not an island cell. That is, if the adjacent cell is an island cell, the mobile phone does not reselect the adjacent cell; and the adjacent cell reselected by the mobile phone is a non-island cell.

In another embodiment, on the basis that the frequency points of the islanding cell and the islanding cell are marked by the mobile phone, when the mobile phone performs cell search according to the historical frequency points or the full frequency band supported by the mobile phone in step 306, the frequency points of the islanding cell may be skipped to perform cell search, so that the islanding cell meeting the residence condition is not searched, and therefore the islanding cell is not reselected. That is, when the cell search is performed in step 306, the cell of the mobile phone does not search for the frequency point corresponding to the islanding cell.

In another embodiment, on the basis that the handset marks the frequency points of the islanding cell and the islanding cell, the staying condition in step 306 may include that the target cell is not an islanding cell. When the cell is searched according to the history frequency point or the full frequency band supported by the cell, if the searched cell is an island cell, the cell does not meet the residence condition, and the cell cannot be reselected by the cell. The cell reselected by the mobile phone is a non-island cell.

In other embodiments of the present application, when it is determined that the serving cell is not configured with an adjacent cell according to the first information in step 302, the mobile phone may set a preset time length T corresponding to the serving cell, in addition to marking the serving cell and the frequency point of the serving cell. Specifically, the preset time period T may be implemented by a timer T.

With optimization of network planning, the original islanding cell may no longer be an islanding cell after a period of time. Therefore, after a certain cell is determined to be an island cell, a preset time length T can be set for the island cell, and within the preset time length T (that is, the timer T is not overtime), the mobile phone does not reselect the island cell, and the preset time length T can be referred to as a punishment period of the island cell; after the preset time period T, the cell may no longer be an island cell, and the handset may reselect to the cell.

In an embodiment, based on the timer T, the reselection condition in step 303 may include that the timer T corresponding to the target neighboring cell has expired. That is, the handset may reselect to an islanding cell exceeding the penalty period T, but cannot reselect to an islanding cell within the penalty period T.

In another embodiment, based on the timer T, when the cell search is performed by the mobile phone according to the historical frequency points or the full frequency band supported by the mobile phone in step 306, the frequency point of the first cell determined not to be configured with the adjacent cell in the previous preset time period T may be skipped to perform the cell search. That is to say, the cell search can be performed by the mobile phone skipping the frequency point of the island cell whose timer T is not overtime, so that the island cell which meets the residence condition and whose timer T is not overtime is not searched and reselected.

In yet another embodiment, based on the timer T, the camping condition in step 306 may include that the target cell is determined not to be configured with a neighboring cell before the preset time period T. That is, the target cell may be an islanding cell, but the timer T corresponding to the islanding cell has timed out; the mobile phone can reselect an island cell exceeding the punishment period T, but can not reselect an island cell within the punishment period T.

In some other embodiments of the present application, after the timer T corresponding to the cell marked as the islanding cell expires, the mobile phone may cancel the marking that the cell is the islanding cell.

In some other embodiments of the present application, if the serving cell where the mobile phone is currently located is already marked as an islanding cell before, but it is determined this time that the serving cell is configured with the neighboring cell, the mobile phone may cancel the marking that the serving cell is the islanding cell.

In addition, if the mobile phone does not search for the target cell meeting the camping condition in step 306, the mobile phone still camps on the current serving cell. In one case, the handset may temporarily not mark the serving cell as an island cell when it determines that the serving cell is not configured with a neighboring cell in step 302; after the target cell meeting the residence condition is not searched in step 306, the mobile phone marks the serving cell as an island cell and sets a corresponding timer T; in another case, when the mobile phone determines that the serving cell is not configured with the neighboring cell in step 302, the serving cell may not be marked as an island cell for the time being; if it is determined in step 306 that the target cell satisfying the camping condition is not searched, the serving cell is not marked as an islanding cell, and the corresponding timer T is not set.

It should be noted that the above mainly describes 2G, 3G, and 4G mobile communication networks as examples, and cell reselection may be performed in the manner described in the above embodiments for other mobile communication networks after 5G and 5G, and the embodiments of the present application are not limited thereto.

It is understood that in order to implement the above-described functions, the terminal includes corresponding hardware and/or software modules for performing the respective functions. The present application is capable of being implemented in hardware or a combination of hardware and computer software in conjunction with the exemplary algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed in hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, with the embodiment described in connection with the particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The terminal disclosed in the embodiments of the present application is used to implement the above embodiments of the method, so that the terminal may be divided into functional modules according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be implemented in the form of hardware. It should be noted that, the division of the modules in this embodiment is schematic, and is only one logic function division, and another division manner may be available in actual implementation.

In the case of dividing each functional module by corresponding functions, fig. 7 shows a possible composition diagram of the terminal 700 involved in the above embodiment, as shown in fig. 7, the terminal 700 may include: a determination unit 701, a search unit 702, a processing unit 703, and the like.

Determination unit 701 may be configured to enable terminal 700 to perform

steps

301, 302, 303, etc. described above, and/or other processes for the techniques described herein.

Search element 702 may be used to enable terminal 700 to perform steps 306, etc., described above, and/or other processes for the techniques described herein.

Processing unit 703 may be used to enable terminal 700 to perform

steps

300, 304, 305, 307, etc., described above, and/or other processes for the techniques described herein.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

The terminal 700 provided in this embodiment is configured to execute the method for cell reselection, so that the same effect as that of the implementation method can be achieved.

In case of employing an integrated unit, the terminal 700 may include a processing module, a storage module, and a communication module. The processing module may be configured to control and manage the actions of the terminal 700, and for example, may be configured to support the terminal 700 to execute the steps executed by the determining unit 701, the searching unit 702, and the processing unit 703. The storage means may be used to support the terminal 700 to store information of neighboring cells, information of islanding cells, as well as program code and data, etc. The communication module may be configured to support communication between the terminal 700 and other devices, for example, may be configured to support the terminal 700 to obtain system information from a base station.

The processing module may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., a combination of one or more microprocessors, a Digital Signal Processing (DSP) and a microprocessor, or the like. The storage module may be a memory. The communication module may specifically be a radio frequency circuit, a bluetooth chip, a Wi-Fi chip, or other devices that interact with other terminals.

In one embodiment, when the processing module is a processor and the storage module is a memory, the terminal according to the embodiment may be the terminal 100 having the structure shown in fig. 2.

Embodiments of the present application further provide a computer storage medium, where computer instructions are stored, and when the computer instructions are run on a terminal, the terminal is caused to execute the above related method steps to implement the method for cell reselection in the above embodiments.

Embodiments of the present application further provide a computer program product, which when run on a computer, causes the computer to execute the above related steps to implement the method for cell reselection performed by the terminal in the above embodiments.

In addition, an apparatus, which may be specifically a chip, a component or a module, may include a processor and a memory connected to each other; the memory is used for storing computer execution instructions, and when the device runs, the processor can execute the computer execution instructions stored in the memory, so that the chip can execute the cell reselection method executed by the terminal in the above-mentioned method embodiments.

The terminal, the computer storage medium, the computer program product, or the chip provided in this embodiment are all configured to execute the corresponding method provided above, so that the beneficial effects achieved by the terminal, the computer storage medium, the computer program product, or the chip may refer to the beneficial effects in the corresponding method provided above, and are not described herein again.

Through the description of the above embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application, or portions of the technical solutions that substantially contribute to the prior art, or all or portions of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a variety of media that can store program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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

Claims

1. A method of cell reselection, comprising:

in an idle state, determining that the signal quality in the continuous time T1 of the resident serving cell is lower than or equal to a first preset value, and if the terminal determines that the resident serving cell is not configured with an adjacent cell, the terminal performs cell search;

if the terminal searches a target cell meeting the residence condition, the terminal reselects and resides in the target cell;

the resident condition includes that the target cell includes a cell which is determined not to be configured with an adjacent cell before a preset time length T;

the terminal carries out cell search, and the cell search comprises the following steps:

the terminal searches cells according to at least one history frequency point which is successfully registered before, each frequency point corresponds to at least one cell, the history frequency points do not comprise a first frequency point, the first frequency point is a frequency point corresponding to a target island cell, and the target island cell is determined not to be configured with an adjacent cell within the preset time length T before.

2. The method of claim 1,

if the terminal searches a target cell meeting the residence condition, the terminal reselects and resides in the target cell, and the method comprises the following steps:

if the terminal successfully searches a target cell meeting the residence condition according to the historical frequency point, the terminal reselects and resides in the target cell;

and the residence condition comprises that the signal quality of the frequency point corresponding to the target cell is higher than a second preset value.

3. The method of claim 2, wherein the terminal performs cell search, further comprising:

if the terminal does not search a target cell meeting the residence condition according to the historical frequency point, the terminal searches the cell according to all frequency bands supported by the terminal;

if the terminal searches a target cell meeting the residence condition, the terminal reselects and resides in the target cell, and the method further comprises the following steps:

and if the terminal successfully searches the target cell meeting the residence condition according to all the frequency bands supported by the terminal, reselecting and residing in the target cell by the terminal.

4. The method of claim 3, wherein the performing, by the terminal, cell search according to all frequency bands supported by the terminal comprises:

and the terminal searches the cells according to the sequence of the 4G network frequency point, the 3G network frequency point and the 2G network frequency point in all the frequency bands supported by the terminal.

5. The method according to claim 3 or 4, wherein the performing, by the terminal, cell search according to all frequency bands supported by the terminal comprises:

and the terminal searches the cells according to the frequency points except the frequency point corresponding to the first cell and the historical frequency point in all the frequency bands supported by the terminal, wherein the first cell is a cell which is not configured with an adjacent cell.

6. The method according to any of claims 1-4, wherein the camping condition comprises that the target cell is not a first cell, and that the first cell is a cell not configured with a neighboring cell.

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

and if the terminal does not search the target cell meeting the residence condition, the terminal continuously resides in the service cell.

8. The method according to any of claims 1-7, wherein the terminal determining that the camped serving cell is not configured with a neighbor cell comprises:

the terminal acquires first information from at least one of system information, Radio Resource Control (RRC) connection reconfiguration information or measurement control information;

the terminal determining whether the first information includes information of a neighbor cell of the serving cell;

if the first information does not include information of the adjacent cell, the terminal determines that the resident serving cell is not configured with the adjacent cell.

9. The method of claim 8, further comprising:

if the first information comprises information of adjacent cells, configuring the adjacent cells for the serving cell where the terminal resides;

if the target adjacent cell meeting reselection conditions exists in the adjacent cells, reselecting and residing in the target adjacent cell by the terminal;

and if the target adjacent cell meeting the reselection condition does not exist in the adjacent cells, the terminal continuously resides in the serving cell.

10. A terminal, comprising: one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions which, when executed by the terminal, cause the terminal to perform the steps of:

in an idle state, determining that the signal quality in the continuous time T1 of the resident serving cell is lower than or equal to a first preset value, and if the resident serving cell is determined not to be configured with an adjacent cell, performing cell search;

if the target cell meeting the residence condition is searched, reselecting and residing in the target cell;

the resident condition includes that the target cell includes a cell which is determined not to be configured with a neighboring cell before a preset time length T;

11. The terminal of claim 10, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

if a target cell meeting the residence condition is successfully searched according to the historical frequency point, reselecting and residing in the target cell;

and the resident condition comprises that the signal quality of the frequency point corresponding to the target cell is higher than a second preset value.

12. The terminal of claim 11, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

if a target cell meeting the residence condition is not searched according to the historical frequency points, cell search is carried out according to all frequency bands supported by the terminal;

and if the target cell meeting the residence condition is successfully searched according to all the frequency bands supported by the terminal, reselecting and residing in the target cell.

13. The terminal of claim 12, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

and searching the cell according to the sequence of the 4G network frequency point, the 3G network frequency point and the 2G network frequency point in all the frequency bands supported by the terminal.

14. A terminal as claimed in claim 12 or 13, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

and searching the cells according to other frequency points except the frequency point corresponding to the first cell and the historical frequency point in all frequency bands supported by the terminal, wherein the first cell is a cell which is not configured with an adjacent cell.

15. The terminal according to any of claims 10-13, wherein the camping condition comprises that the target cell is not a first cell, and the first cell is a cell not configured with a neighboring cell.

16. A terminal according to any of claims 10-15, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

and if the target cell meeting the residence condition is not searched, continuing to reside in the serving cell.

17. A terminal according to any of claims 10-16, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

acquiring first information from at least one of system information, Radio Resource Control (RRC) connection reconfiguration information or measurement control information;

determining whether the first information includes information of neighbor cells of the serving cell;

and if the first information does not comprise the information of the adjacent cell, determining that the resident serving cell is not configured with the adjacent cell.

18. The terminal of claim 17, wherein the instructions, when executed by the terminal, cause the terminal to perform the steps of:

if the first information comprises the information of the adjacent cell, the resident serving cell is configured with the adjacent cell;

if the target adjacent cell meeting reselection conditions exists in the adjacent cells, reselecting and residing in the target adjacent cell;

and if the target adjacent cell meeting the reselection condition does not exist in the adjacent cells, continuing to reside in the serving cell.