Cell reselection method and mobile terminal

Abstract

The present application relates to the technical field of communications, and discloses a cell reselection method and a mobile terminal. The method comprises: a mobile terminal acquiring the reselection priority of each cell and measuring the signal quality of each cell; when the reselection priority of a target cell is lower than the reselection priority of a serving cell of the mobile terminal and the target cell does not meet a low-priority reselection condition, acquiring a signal difference result of the target cell; and when the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, increasing the reselection priority of a frequency point of the target cell, so that the mobile terminal performs cell reselection on the basis of the priorities of the frequency point to which the target cell having the increased reselection priority belongs and frequency points to which other non-serving cells belong. The effectiveness of cell reselection by the mobile terminal is improved, so that the mobile terminal can reselect a cell having better signal quality and better network quality.

Description

Cell reselection method and mobile terminal

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 8, 2023, with application number 202311691557.X and invention name “A cell reselection method and mobile terminal”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of communication technology, and in particular to a cell reselection method and a mobile terminal. Background Art

[0003] The system message of a mobile terminal's serving cell contains the public priority level corresponding to the serving cell's frequency and the public priority level corresponding to at least one non-serving cell's frequency. A frequency can correspond to multiple cells. When a mobile terminal needs to reselect a cell, it can reselect the cell corresponding to each frequency based on the priority level of each frequency in the system message.

[0004] Generally, in a frequency-priority-based cell reselection mechanism, the higher the frequency priority, the more likely the mobile terminal will reselect the cell corresponding to that frequency as its serving cell. Under this cell reselection mechanism, the high-priority serving cell selected by the mobile terminal after cell reselection may have poor signal quality, resulting in the mobile terminal still experiencing poor network quality and network lag after cell reselection.

[0005] Summary of the Invention

[0006] Embodiments of the present application provide a cell reselection method and mobile terminal, wherein the mobile terminal can increase the priority of a target cell whose signal quality is higher than that of a serving cell and whose priority is lower than that of the serving cell, but which does not meet the low-priority reselection conditions. The mobile terminal can perform cell reselection from a cell list that includes the target cell with higher signal quality after the priority is increased, thereby improving the effectiveness of the mobile terminal's cell reselection and further ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0007] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions.

[0008] In a first aspect, a cell reselection method is provided, the method comprising:

[0009] The mobile terminal obtains the reselection priority of each cell and detects the signal quality of each cell.

[0010] The signal quality of each cell may be represented by a measured value of at least one parameter of the reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), and signal to interference plus noise ratio (SINR) of each cell.

[0011] When the reselection priority of the target cell is lower than the reselection priority of the service cell of the mobile terminal, and the target cell does not meet the low-priority reselection condition, the signal difference result of the target cell is obtained; the target cell is any non-service cell among the cells except the service cell, and the target cell does not meet the low-priority reselection condition including that the signal quality of the service cell is greater than or equal to a preset first signal threshold, and / or the signal quality of the target cell is less than a preset second signal threshold.

[0012] If the signal difference result indicates that the signal quality of the target cell is greater than that of the serving cell, the reselection priority of the target cell's frequency is increased. The mobile terminal then performs cell reselection based on the increased reselection priority of the target cell's frequency and the priorities of other non-serving cells' frequencies.

[0013] In the present application, when a mobile terminal performs cell reselection based on the corresponding reselection priorities of each cell, it can first detect the signal quality of each cell. If there is a target cell with a reselection priority lower than that of the mobile terminal's serving cell and that does not meet the low-priority reselection criteria, the signal quality difference between the target cell and the serving cell can be further determined. If the signal quality of the target cell is better than that of the serving cell, the reselection priority of the target cell can be increased, making it possible for the mobile terminal to reselect to the target cell with higher signal quality. For example, the reselection priority of cell 1 is lower than that of the serving cell, but the signal quality of cell 1 is less than a preset second signal threshold and does not meet the low-priority reselection criteria. The mobile terminal further determines that the signal quality of cell 1 is better than that of the serving cell. In this case, the reselection priority of cell 1 is increased, providing the mobile terminal with a cell with a higher reselection priority and higher signal quality as an alternative. This application can prevent the mobile terminal from failing to reselect a cell with good signal quality but a low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell the mobile terminal accesses after cell reselection is a cell with higher signal quality.

[0014] In another possible implementation of the first aspect, the system message of the mobile terminal includes the frequency to which the target cell belongs and the first priority of the frequency to which the target cell belongs, the dedicated signaling of the mobile terminal does not include the frequency to which the target cell belongs, the reselection priority of the target cell is a preset priority, and the first priority is higher than the preset priority.

[0015] Then, when the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, the reselection priority of the target cell frequency is increased, including:

[0016] When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset first difference threshold, the mobile terminal determines the reselection priority of the target cell as the first priority.

[0017] The first priority of the frequency point to which the target cell belongs included in the system message is the shared reselection priority.

[0018] In the present application, the mobile terminal can restore the reselection priority of the target cell to the common reselection priority corresponding to the frequency point to which the target cell belongs in the system message, so that the target cell with higher signal quality can be considered for cell reselection by the mobile terminal, thereby avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0019] In another possible implementation of the first aspect, the system message of the mobile terminal includes the frequency to which the target cell belongs and the first priority of the frequency to which the target cell belongs, the dedicated signaling of the mobile terminal does not include the frequency to which the target cell belongs, the reselection priority of the target cell is a preset priority, and the first priority is higher than the preset priority.

[0020] Then, when the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, the reselection priority of the target cell frequency is increased, including:

[0021] When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset second difference threshold, if the first priority is less than the reselection priority of the serving cell, the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0022] In the present application, if the reselection priority of the target cell itself (the reselection priority indicated in the system message) is relatively low, lower than the reselection priority of the serving cell, the mobile terminal can increase the reselection priority of the target cell to the reselection priority of the serving cell, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, avoiding the mobile terminal from failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0023] In another possible implementation manner of the first aspect, the dedicated signaling of the mobile terminal includes the frequency to which the target cell belongs and the second priority of the frequency to which the target cell belongs; the second priority is lower than the reselection priority of the serving cell.

[0024] Then, when the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, the reselection priority of the target cell frequency is increased, including:

[0025] When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset third difference threshold, the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0026] Among them, the second priority of the frequency point of the serving cell included in the dedicated signaling is the dedicated reselection priority of the serving cell, and the reselection priority of the frequency point of the target cell included in the dedicated signaling is the dedicated reselection priority of the target cell.

[0027] In the present application, the mobile terminal can increase the reselection priority of the target cell to the reselection priority of the serving cell, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0028] In another possible implementation manner of the first aspect, the system message of the mobile terminal includes a frequency point to which a serving cell belongs and a reselection priority point of the frequency point to which the serving cell belongs.

[0029] Then, when the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, the reselection priority of the target cell frequency is increased, including:

[0030] When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than the preset fourth difference threshold, the mobile terminal determines the reselection priority of the target cell as the third priority.

[0031] The third priority is higher than or equal to the reselection priority of the serving cell.

[0032] In the present application, the mobile terminal can directly increase the reselection priority of the target cell to a level higher than or equal to the reselection priority of the frequency point to which the serving cell belongs, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, thereby avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0033] In another possible implementation of the first aspect, the system message of the mobile terminal includes a first frequency set, the dedicated instruction of the mobile terminal includes a second frequency set, and the intersection of the first frequency set and the second frequency set includes at least the frequency to which the serving cell belongs.

[0034] Then, the mobile terminal detects the signal quality of each cell, including:

[0035] The mobile terminal detects the signal quality of the cell covered by the first frequency point set; the mobile terminal detects the signal quality of the cell covered by the second frequency point set.

[0036] In the present application, the system message and the RRC release connection message may indicate each cell at the same frequency point and / or different frequency point as the mobile terminal service cell. The mobile terminal performs cell measurement on the cells covered by each frequency point included in the system message and the cells covered by each frequency point included in the RRC release connection message. It may measure cells with different reselection priorities to obtain a cell with higher signal quality for cell reselection.

[0037] In another possible implementation of the first aspect, the mobile terminal detecting the signal quality of each cell includes:

[0038] When the signal quality of the serving cell is less than a preset third signal threshold, the mobile terminal detects the signal quality of each cell; the preset third signal threshold is greater than the preset first signal threshold.

[0039] In this application, when the signal quality of the serving cell is less than the third signal threshold, the mobile terminal can be triggered to detect the signal quality of each cell, so that the mobile terminal can switch to the cell with higher signal quality in a timely manner, thereby ensuring the communication quality of the mobile terminal and the network fluency of other services, and optimizing the user's communication experience.

[0040] In another possible implementation of the first aspect, the mobile terminal detecting the signal quality of each cell includes:

[0041] When the mobile terminal is in an idle state, the mobile terminal detects the signal quality of each cell.

[0042] In the present application, the signal quality measurement of each cell when the mobile terminal is in an idle state can reduce the impact of the cell measurement performed by the mobile terminal on the mobile terminal service, and also provide more communication resources for the cell measurement.

[0043] In another possible implementation of the first aspect, the system message of the mobile terminal includes the fourth priority of each frequency in the first frequency set, and the dedicated signaling of the mobile terminal includes the fifth priority of each frequency in the second frequency set;

[0044] The mobile terminal obtains the reselection priority of each cell, including:

[0045] If the first frequency point is included in both the first frequency point set and the second frequency point set, the reselection priority of the first frequency point is the fifth priority of the first frequency point; if the second frequency point is included in the first frequency point set and the second frequency point is not included in the second frequency point set, the reselection priority of the second frequency point is the preset priority.

[0046] Among them, the preset priority is less than the fifth priority, the preset priority is less than the fourth priority, and the preset priority is less than the reselection priority of the serving cell.

[0047] In this application, dedicated signaling is used to be sent to the mobile terminal in some specified scenarios or test scenarios. Therefore, after receiving the dedicated signaling, the mobile terminal uses the dedicated reselection priority of each frequency point in the dedicated signaling as the reselection priority for subsequent cell measurement and cell reselection, which can meet the needs of the specified scenario or test scenario.

[0048] In a second aspect, a mobile terminal is provided, which includes a communication interface, a memory and one or more processors; the communication interface, the memory and the processor are coupled; the memory stores computer program code, and the computer program code includes computer instructions. When the computer instructions are executed by the processor, the mobile terminal executes a method as described in any one of the above-mentioned first aspects.

[0049] In a third aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium. When the computer-readable storage medium is executed on a mobile terminal, the mobile terminal can execute any one of the methods described in the first aspect.

[0050] In a fourth aspect, a computer program product comprising instructions is provided, which, when executed on a mobile terminal, enables the mobile terminal to execute any one of the methods described in the first aspect.

[0051] In a fifth aspect, an embodiment of the present application provides a chip, the chip including a processor, the processor being used to call a computer program in a memory to execute the method of the first aspect.

[0052] It can be understood that the beneficial effects that can be achieved by the mobile terminal described in the second aspect, the computer-readable storage medium described in the third aspect, the computer program product described in the fourth aspect, and the chip described in the fifth aspect provided above can refer to the beneficial effects in the first aspect and any possible design method thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG1 is a schematic diagram of a network architecture provided in an embodiment of the present application;

[0054] FIG2 is a schematic diagram of a flow chart of a cell reselection method provided in an embodiment of the present application;

[0055] FIG3 is a schematic diagram of determining a cell reselection priority according to an embodiment of the present application;

[0056] FIG4 is a schematic diagram of a flow chart of another cell reselection method provided in an embodiment of the present application;

[0057] FIG5 is a schematic diagram of a flow chart of another cell reselection method provided in an embodiment of the present application;

[0058] FIG6 is a schematic diagram of a flow chart of another cell reselection method provided in an embodiment of the present application;

[0059] FIG7 is a schematic diagram of a flow chart of another cell reselection method provided in an embodiment of the present application;

[0060] FIG8 is a schematic structural diagram of a mobile terminal provided in an embodiment of the present application;

[0061] FIG9 is a schematic structural diagram of a chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] In the description of the embodiments of the present application, the terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and claims of the present application, the singular expressions "a", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one or more (including two). The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist; for example, A and / or B can represent: the situation where A exists alone, A and B exist at the same time, and B exists alone, wherein A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are a kind of "or" relationship.

[0063] References to "one embodiment" or "some embodiments" etc. described in this specification mean that the specific features, structures or characteristics described in conjunction with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in another way. The term "connected" includes direct and indirect connections, unless otherwise stated. "First" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0064] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0065] The mobile terminal can communicate with the core network or the Internet via a wireless access network. The device that connects the mobile terminal to the wireless network is a wireless access network device. In this embodiment, the mobile terminal can be a portable computer (such as a mobile phone), a tablet computer, a laptop computer, a computer with wireless transceiver function, a wearable device (such as a smart watch), an augmented reality (AR) / virtual reality (VR) device, a car computer, a drone, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the mobile terminal. The wireless access network device can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation base station (next generation NodeB, gNB) in the fifth generation (5G) mobile communication system, a next-generation base station in the sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.

[0066] For a mobile terminal to communicate with a radio access network device, it must establish a connection with the cell controlled by the radio access network device. This means that the mobile terminal must access and reside in a cell controlled by the radio access network device to establish a communication connection with the radio access network device and, further, to communicate with the core network and the Internet. In some practical scenarios, when a mobile terminal is already camped on a cell, it may be triggered to reselect the cell due to various reasons.

[0067] For example, referring to Figure 1, which illustrates a network architecture diagram, a mobile terminal is within the coverage of cell 1 controlled by radio access network device 1. Its current cell is cell 1, where the signal quality is relatively high. Subsequently, the mobile terminal moves from the coverage of cell 1 to the coverage of cell 2 controlled by radio access network device 2. This causes changes in the reception quality of signals from different radio access network devices (radio access network device 1 and radio access network device 2) to the mobile terminal.

[0068] For example, as a mobile terminal moves away from the coverage of cell 1, the signal quality of the searched cell 1 deteriorates. However, as the mobile terminal enters the coverage of cell 2, the signal quality of the searched cell 2 improves. In this case, the mobile terminal can reselect cells among multiple neighboring cells (also known as non-serving cells) to locate a cell with higher signal quality at its current location.

[0069] Alternatively, for example, the location of the mobile terminal remains unchanged, but for some reason, the signal quality of the cell where the mobile terminal resides changes. When the mobile terminal is in the radio resource control idle (RRC idle) state, it can also obtain a cell with higher signal quality at the current location for residency by performing cell reselection among multiple neighboring cells (also known as non-serving cells). The mobile terminal can measure the neighboring cells, and if the measurement results of the cells meet the cell selection criterion (S criterion), it can reside on the cell that meets the cell selection criteria.

[0070] In some embodiments, the measurement results of the cell characterize the signal quality of the cell to a certain extent. Exemplarily, the measurement results may include reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), and signal to interference plus noise ratio (SINR), without specific limitation. The above-mentioned satisfaction of the S criterion may be that Srxlev>0 and Squal>0 are satisfied. Among them, Srxlev represents the receiving power value of the cell, and Srxlev is positively correlated with the RSRP of the cell; Squal characterizes the signal quality value of the cell, and Squal is positively correlated with the RSRQ of the cell. Only when the cell meets the S criterion can the terminal device choose to reside in the cell.

[0071] Specifically, the cell reselection process may include a measurement initiation phase, a measurement result evaluation phase, and a cell reselection phase.

[0072] For the measurement startup phase: During the measurement startup phase, the mobile terminal can obtain the reselection priority of each cell.

[0073] The cell reselection priority is the first parameter a mobile terminal considers when performing cell reselection. Different access networks correspond to different frequencies. An access network can include multiple frequencies, and a frequency can correspond to multiple cells. Access network equipment can control multiple cells, each corresponding to a frequency. Cells corresponding to the same frequency have the same reselection priority. Therefore, the cell reselection priority also refers to the reselection priority of the cell corresponding to the frequency. The priorities of different frequencies can be the same or different.

[0074] The cell reselection priority can be configured by the radio access network equipment. For example, when a mobile terminal accesses the radio access network, the cell reselection priority can be notified to the mobile terminal through a serving cell broadcast (i.e., a serving cell system message). The parameter corresponding to the cell reselection priority can be cellReselectionPriority, which can range from 0 to 7. A larger value indicates a higher reselection priority for the corresponding frequency point of the cell.

[0075] The system message of the serving cell may include a system information block (SIB). For example, in a communication system based on the global system for mobile communications (GSM), the GSM system message of the serving cell may include 8 information blocks (SIB1-SIB8). In a communication system based on wideband code division multiple access (WCDMA), the WCDMA system message of the serving cell may include 19 information blocks (SIB1-SIB19). In a communication system based on long term evolution (LTE), the LTE system message of the serving cell may include 13 information blocks (SIB1-SIB13).

[0076] Typically, SIB3 may include the reselection priority for the same-frequency point (the frequency point belonging to the serving cell); SIB5 may include the reselection priority for the different-frequency point (the frequency point belonging to a non-serving cell); SIB6-SIB8 may include the reselection priority for different-system frequency points. Different-system frequency points refer to, for example, if the serving cell is a GSM communication cell, the different-system frequency points of the serving cell refer to the frequency points corresponding to the WCDMA communication system or the frequency points corresponding to the LTE communication system.

[0077] In addition to obtaining the reselection priorities of different cell frequencies through broadcasted system messages, a mobile terminal can also obtain the reselection priorities of cell frequencies through dedicated signaling. Exemplarily, the dedicated signaling can be an RRC connection release message. When a mobile terminal receives an RRC connection release message containing the cellReselectionPriority parameter, the cell reselection priority parameter configured in the RRC connection release message is used.

[0078] In addition to obtaining the reselection priority of each frequency point (corresponding cell) based on the system message and RRC connection release message, the mobile terminal can also inherit the reselection priority of each frequency point (corresponding cell) through other radio access technologies (radio access technology, RAT).

[0079] In some embodiments, the reselection priority in the system message of the serving cell may be referred to as a common reselection priority, and the reselection priority in the RRC connection release message and inherited through other RATs may be referred to as a dedicated reselection priority.

[0080] For a certain frequency point (or cell), when the mobile terminal does not receive a dedicated reselection priority, the shared reselection priority can be used as the current reselection priority of the frequency point; and when the mobile terminal receives a dedicated reselection priority, the dedicated reselection priority can be used as the current reselection priority of the frequency point, ignoring the shared reselection priority.

[0081] Specifically, for example, the system message received by the mobile terminal includes a common reselection priority of 1 for frequency 1. If the mobile terminal receives an RRC connection release message, and the RRC connection release message includes a dedicated reselection priority of 2 for frequency 1, then the reselection priority of frequency 1 is determined to be 2 for subsequent cell reselection operations.

[0082] In some scenarios, if the RRC connection release message does not include the dedicated reselection priority of the frequency included in the system message, the reselection priority of the frequency included in the system message and not included in the RRC connection release message is set to the lowest priority.

[0083] For example, the system message received by the mobile terminal includes a common reselection priority of 1 for frequency 1 and a common reselection priority of 2 for frequency 2. If the mobile terminal receives an RRC connection release message, the RRC connection release message includes a dedicated reselection priority of 2 for frequency 1. The dedicated reselection priority of 2 for frequency 1 in the RRC connection release message is determined as the reselection priority of frequency 1; since the RRC connection release message does not include the dedicated priority of frequency 2, the reselection priority of frequency 2 is set to the lowest priority. In the example where the frequency reselection priority is represented by 0-7 and the larger the value, the higher the priority, the lowest priority can be 0.

[0084] For measurement result evaluation and cell reselection phases:

[0085] The conditions for the mobile terminal to perform cell measurement and cell reselection are different for cells on different reselection priority frequencies. For a neighboring cell with a higher reselection priority than the serving cell, if the Srxlev of the neighboring cell is greater than a preset threshold value for a first duration, and the mobile terminal has resided in the current serving cell for more than 1 second, the mobile terminal device may trigger the process of reselecting to the neighboring cell.

[0086] It can be understood that for a neighboring cell whose reselection priority is higher than the reselection priority of the serving cell, the mobile terminal does not need to consider the signal quality of the serving cell. When the cell with a higher reselection priority meets the above reselection conditions, the mobile terminal can reselect the neighboring cell.

[0087] For neighboring cells whose reselection priority is the same as that of the serving cell (which may include other cells at the frequency corresponding to the serving cell, or cells corresponding to different frequency points), the mobile terminal may introduce the R criterion for cell reselection to perform cell measurement and cell reselection.

[0088] The R criterion means that the mobile terminal can calculate the R value of all cells that meet the S criterion and sort them by R value. The cell ranked first is considered the optimal cell. The R value is positively correlated with the RSRP value of the cell. The R value can also indicate the signal quality of the cell to a certain extent. The larger the R value, the higher the signal quality of the cell.

[0089] Exemplarily, for a neighboring cell whose reselection priority is equal to the reselection priority of the serving cell, based on the R value calculation results of each neighboring cell, if the R value (Rn) of the neighboring cell is greater than the R value (Rs) of the serving cell and lasts for a first period of time, and the mobile terminal has resided in the current serving cell for more than 1 second, the mobile terminal can trigger the process of reselecting to the neighboring cell.

[0090] For a neighboring cell with a lower reselection priority than the serving cell, if no cell on the frequency point with a high reselection priority meets the reselection conditions of the high-priority cell, and at the same time, no cell on the frequency point corresponding to the serving cell or other different-frequency points with the same reselection priority meets the reselection conditions of the same-priority cell. In this case, the mobile terminal triggers the low-priority reselection conditions (conditions for cell measurement and cell reselection from neighboring cells with a lower reselection priority than the serving cell), including: the Srxlev of the serving cell is less than the preset first signal threshold, and the Srxlev of the neighboring cell is greater than the preset second signal threshold and lasts for a second time, and the mobile terminal has been stationed in the current serving cell for more than 1 second, the terminal can trigger the process of reselecting to the neighboring cell.

[0091] That is, when no cell meets the reselection conditions of the high-priority cell on the frequency point with high reselection priority, and at the same time, no cell meets the reselection conditions of the same-priority cell on the frequency point corresponding to the serving cell or other different-frequency points with the same reselection priority, when the signal quality of the serving cell is poor (Srxlev is less than the preset first signal threshold and stays for more than 1 second), and the signal quality of the neighboring cell is good (Srxlev is greater than the preset second signal threshold and lasts for a second time), the low-priority reselection conditions are met, and the mobile terminal will be triggered to perform cell measurement and cell reselection from the neighboring cell whose reselection priority is lower than the reselection priority of the serving cell.

[0092] The above-mentioned cell reselection mechanism can also be understood as a mechanism for performing cell reselection based on the corresponding reselection priority of each cell. This cell reselection mechanism may result in a mobile terminal being unable to reselect a cell with a lower reselection priority than the serving cell but with better signal quality. For example, the serving cell's reselection priority is 2, and its Srxlev is less than a preset first signal threshold. Cell 1's reselection priority is 0 (lower than the serving cell's reselection priority), but its Srxlev is less than a preset second signal threshold, and its Srxlev is greater than the serving cell's Srxlev. That is, although the signal quality Srxlev of cell 1, which has a lower reselection priority, is higher than that of the serving cell, its Srxlev is less than the third threshold, failing to meet the low-priority reselection condition (Srxlev is greater than the preset second signal threshold). In this case, during cell reselection, the mobile terminal will have difficulty reselecting to cell 1, and will lose a cell with higher signal quality for cell reselection. In addition, it may also cause the mobile terminal to still experience poor network quality, network lag, inability to receive calls, and users seeing fewer signal bars on the interface than other mobile phones after cell reselection.

[0093] An embodiment of the present application provides a cell reselection method. When a mobile terminal performs cell reselection based on the corresponding reselection priority of each cell, it can first detect the signal quality of each cell. If there is a target cell whose reselection priority is lower than the reselection priority of the mobile terminal's serving cell and does not meet the low-priority reselection criteria, the signal quality difference between the target cell and the serving cell can be further determined. If the signal quality of the target cell is better than that of the serving cell, the reselection priority of the target cell can be increased, thereby increasing the likelihood that the mobile terminal will reselect to the target cell with higher signal quality. For example, the reselection priority of cell 1 is lower than that of the serving cell, but the signal quality of cell 1 is less than a preset second signal threshold and does not meet the low-priority reselection criteria. The mobile terminal further determines that the signal quality of cell 1 is better than that of the serving cell. In this case, the reselection priority of cell 1 is increased, providing the mobile terminal with a cell with both a higher reselection priority and higher signal quality as an alternative. This application can prevent the mobile terminal from failing to reselect a cell with good signal quality but a low reselection priority during cell reselection, thereby improving the effectiveness of cell reselection for the mobile terminal and ensuring that the cell the mobile terminal accesses after cell reselection is a cell with higher signal quality.

[0094] In some embodiments, the low reselection priority of a cell includes that the shared reselection priority of the frequency corresponding to the cell included in the system message is inherently low. For example, when the mobile terminal does not receive the RRC release connection message, the system message indicates that the shared reselection priority of frequency 1 to which the serving cell belongs is 2, and the shared reselection priority of frequency 2 to which cell 2 belongs is 1, and the shared reselection priority of cell 2 is lower than the shared reselection priority of the serving cell.

[0095] In some embodiments, the low reselection priority of a cell further includes the low specific reselection priority of the frequency corresponding to the cell indicated in the RRC release connection message, or the RRC release connection message does not include the specific reselection priority of the frequency corresponding to the cell. For example, the system message received by the mobile terminal indicates that the shared reselection priority of frequency 1 of the serving cell is 2, and the shared reselection priority of frequency 2 of cell 2 is 2. The RRC release connection message received by the mobile terminal indicates that the shared reselection priority of frequency 1 of the serving cell is 2, and the shared reselection priority of frequency 2 of cell 2 is 1. In this case, cell measurement and cell reselection are performed based on the specific reselection priority indicated in the RRC release connection message. Then, the reselection priority of cell 2 (1) is lower than the reselection priority of cell 1 (2). Alternatively, for example, the system message received by the mobile terminal indicates that the shared reselection priority of frequency 1 of the serving cell is 2, and the shared reselection priority of frequency 2 of cell 2 is 2. The RRC release connection message received by the mobile terminal indicates that the shared reselection priority of frequency 1 of the serving cell is 2. Since the RRC Release Connection message does not carry information about the dedicated reselection priority for frequency 2, the reselection priority for frequency 2 is set to the lowest priority (set to 0). At this time, cell measurement and cell reselection are performed based on the reselection priorities of each cell updated based on the dedicated reselection priorities indicated in the RRC Release Connection message. Therefore, the reselection priority of cell 2 (0) is lower than the reselection priority of cell 1 (2).

[0096] For scenarios where a mobile terminal receives a system message and an RRC release connection message to determine the reselection priority of each cell, a cell reselection method is provided to avoid the problem that a cell with high signal quality but low reselection priority is difficult for the mobile terminal to reselect. Referring to FIG2 , FIG2 shows a flow chart of a cell reselection method, including:

[0097] S201. The mobile terminal obtains the reselection priority of each cell.

[0098] In this embodiment, one cell corresponds to one frequency point, and one frequency point may correspond to multiple cells. Cells under the same frequency point have the same reselection priority, and the reselection priority of a cell is also the reselection priority of the frequency point to which the cell belongs.

[0099] When a mobile terminal accesses a wireless access network, the wireless access network device sends a system message to the mobile terminal by broadcasting. The message block (SIB) of the system message may include the shared reselection priority of the frequency point of the mobile terminal's serving cell and the shared reselection priorities of other frequency points.

[0100] When the mobile terminal only receives the system message, that is, the mobile terminal only has the common reselection priority of each frequency point, then the mobile terminal determines the common reselection priority of each frequency point as the reselection priority.

[0101] For example, the system message includes that the shared reselection priority of frequency 1 of the serving cell of the mobile terminal is 2, the shared reselection priority of frequency 2 is 2, the shared reselection priority of frequency 3 is 2, and the shared reselection priority of frequency 4 is 1. Then, the mobile terminal determines the shared reselection priority corresponding to the frequency of each cell as the reselection priority.

[0102] In some scenarios, a radio access network device (such as a base station) randomly sends an RRC Release Connection message to a mobile terminal. Upon receiving an RRC Release Connection message containing cellReselectionPriorit, the mobile terminal performs cell reselection using the frequency-specific reselection priority indicated in the RRC Release Connection message as the reselection priority. cellReselectionPriorit represents the frequency-specific reselection priority.

[0103] For example, the system message includes the shared reselection priority of 2 for frequency 1, the shared reselection priority of 2 for frequency 2, the shared reselection priority of 2 for frequency 3, and the shared reselection priority of 1 for frequency 4, to which the mobile terminal's serving cell belongs. The RRC connection release message includes the dedicated reselection priority of 2 for frequency 1, the dedicated reselection priority of 2 for frequency 2, the dedicated reselection priority of 2 for frequency 3, and the dedicated reselection priority of 2 for frequency 4, to which the mobile terminal's serving cell belongs. The mobile terminal then determines the dedicated reselection priority corresponding to the frequency to which each cell belongs as the reselection priority. For example, the reselection priority of the cell corresponding to frequency 4 is updated from the shared reselection priority of 1 to the dedicated reselection priority of 2.

[0104] Specifically, in some embodiments, the mobile terminal determines the reselection priority of each cell based on the common reselection priority (fourth priority) of each frequency point in the system message and the specific reselection priority (fifth priority) of each frequency point in the dedicated signaling (for example, the RRC release connection message), as shown in Figure 3. Figure 3 shows a schematic diagram of determining the reselection priority of a cell. Among them, the various frequencies indicated by the system message form a first frequency point set. The various frequencies indicated by the RRC release connection message form a second frequency point set. The intersection of the first frequency point set and the second frequency point set includes at least the frequency point belonging to the serving cell. Exemplarily, with reference to Figure 3, the first frequency point set of the system message includes frequency point 1, frequency point 2, frequency point 3 and frequency point 4. The second frequency point set of the RRC release connection message includes frequency point 1, frequency point 2 and frequency point 3. For example, frequency point 1 may be the frequency point belonging to the serving cell of the mobile terminal.

[0105] If the first frequency point set and the second frequency point set both include the first frequency point, the reselection priority of the first frequency point is the fifth priority of the first frequency point.

[0106] In this embodiment, illustratively, with reference to FIG3 , the first frequency points included in both the system message and the RRC release connection message include frequency point 1, frequency point 2, and frequency point 3. In the system message, the shared reselection priority of frequency point 1 is 2, the shared reselection priority of frequency point 2 is 1, and the shared reselection priority of frequency point 3 is 2. In the RRC release connection message, the dedicated reselection priority of frequency point 1 is 2, the dedicated reselection priority of frequency point 2 is 2, and the dedicated reselection priority of frequency point 3 is 2.

[0107] Then, the mobile terminal determines the reselection priorities of frequency 1, frequency 2, and frequency 3 as corresponding dedicated reselection priorities. That is, the reselection priority of frequency 1 is 2, the reselection priority of frequency 2 is 2, and the reselection priority of frequency 3 is 2.

[0108] If the first frequency point set includes the second frequency point and the second frequency point set does not include the second frequency point, the reselection priority of the second frequency point is the preset priority.

[0109] Among them, the preset priority is less than the fourth priority, the preset priority is less than the fifth priority, and the preset priority is less than the reselection priority of the service frequency point to which the service cell belongs.

[0110] In this embodiment, the preset priority may represent the lowest priority. For example, in an example where 0-7 is used to represent the frequency reselection priority and a larger value indicates a higher priority, the preset priority may be 0.

[0111] In this embodiment, illustratively, referring to FIG3 , the second frequency point that is present only in the first frequency point set of the system message and not in the second frequency point set of the RRC release connection message includes frequency 4. The common reselection priority of frequency 4 in the system message is 2. The reselection priority of frequency 4 is determined as the preset priority, and thus, the reselection priority of frequency 4 is set to 0.

[0112] In this embodiment, dedicated signaling is used to be sent to the mobile terminal in some specified scenarios or test scenarios. Therefore, after receiving the dedicated signaling, the mobile terminal uses the dedicated reselection priority of each frequency point in the dedicated signaling as the reselection priority for subsequent cell measurement and cell reselection, which can meet the requirements of the specified scenarios or test scenarios.

[0113] S202: The mobile terminal detects the signal quality of each cell.

[0114] In this embodiment, the mobile terminal may perform cell measurement based on the cells corresponding to the respective frequency points included in the system message to obtain the signal quality of each cell.

[0115] In some embodiments, when the mobile terminal receives the RRC release connection message, it can perform cell measurements on the cells covered by each frequency point included in the system message and the cells covered by each frequency point included in the RRC release connection message to obtain the signal quality of each cell.

[0116] In this embodiment, the system message and the RRC release connection message may indicate each cell at the same frequency point and / or different frequency point as the service cell of the mobile terminal. The mobile terminal performs cell measurement based on the non-service cells covered by the various frequency points included in the system message and the non-service cells covered by the various frequency points included in the RRC release connection message. The mobile terminal may measure cells with different reselection priorities to obtain a cell with higher signal quality for cell reselection.

[0117] The mobile terminal obtains the signal quality of each cell. Signal quality can be represented by parameters such as the cell's received power value Srxlev, the cell's signal quality value Squal, and the signal strength value. For example, the cell's signal quality can also be represented by the signal strength value, such as -110dB, -100dB, -90dB, -80dB, -70dB, and so on. The larger the signal strength value, the higher the signal quality. That is, the signal quality of a cell with a signal strength value of -90dB is higher than the signal quality of a cell with a signal strength value of -100dB.

[0118] S203: When the reselection priority of the target cell is lower than the reselection priority of the serving cell of the mobile terminal and the target cell does not meet the low priority reselection condition, obtain a signal difference result of the target cell.

[0119] The target cell is any non-serving cell in each cell except the serving cell. The target cell does not meet the low priority reselection conditions, including that the signal quality of the serving cell is greater than or equal to a preset first signal threshold, and / or the signal quality of the target cell is less than a preset second signal threshold.

[0120] The second signal threshold is greater than the first signal threshold.

[0121] The first signal threshold can be understood as a threshold value that triggers the mobile terminal to perform cell measurement in a non-serving cell whose reselection priority is lower than the reselection priority of the serving cell. If the signal quality of the serving cell is less than the first signal threshold value, the signal quality of the serving cell is considered to be relatively poor. The second signal threshold value can be understood as a threshold value at which the mobile terminal can measure a non-serving cell whose reselection priority is lower than the reselection priority of the serving cell. If the signal quality of the non-serving cell is higher than the second signal threshold value, since the second signal threshold value is greater than the first signal threshold value, the signal quality of the non-serving cell is higher than the signal quality of the serving cell, then, in this case, it is considered that although the reselection priority of the non-serving cell is relatively low, the signal quality is relatively high, and is higher than the signal quality of the serving cell, and can be considered for cell reselection.

[0122] In this embodiment, referring to FIG. 2 , FIG. 3 is used as an example. The cell reselection priorities obtained by the mobile terminal in FIG. 2 include a reselection priority of 2 for frequency 1, a reselection priority of 2 for frequency 2, a reselection priority of 2 for frequency 3, and a reselection priority of 0 for frequency 4. Frequency 1 is the frequency of the serving cell.

[0123] In some embodiments, if there is a non-serving cell with a higher reselection priority than the serving cell, the mobile terminal may directly reselect and camp on the non-serving cell. If there are multiple non-serving cells with a higher reselection priority than the serving cell, the mobile terminal may directly reselect and camp on the cell with the highest signal quality among the multiple non-serving cells with a higher reselection priority than the serving cell.

[0124] In some embodiments, if there is no non-serving cell with a higher reselection priority than the reselection priority of the serving cell, and there are one or more non-serving cells with the same reselection priority as the serving cell, then the mobile terminal can choose to reselect and reside in a non-serving cell with a higher signal quality than the serving cell from among the one or more non-serving cells with the same reselection priority as the serving cell. For example, as shown in FIG2 , frequency points 2 and 3 have the same reselection priority as frequency point 1 to which the serving cell belongs. If there is a non-serving cell with a higher signal quality than the serving cell among frequency points 2 and 3, then the mobile terminal can choose to reselect and reside in a non-serving cell with a higher signal quality than the serving cell.

[0125] However, among one or more non-service cells with the same reselection priority as the serving cell, there may not be a non-service cell with a higher signal quality than the serving cell. In this case, the mobile terminal detects the signal quality of the non-service cell with a lower reselection priority than the serving cell, and further makes a judgment on cell reselection. For example, as shown in Figure 2, frequency points 2 and 3 have the same reselection priority as frequency point 1 to which the serving cell belongs. If there is no non-service cell with a higher signal quality than the serving cell in the cells corresponding to frequency points 2 and 3, then the mobile terminal can obtain the cell corresponding to frequency point 4 for detection, wherein the reselection priority of frequency point 4 is lower than the reselection priority of frequency point 1. The mobile terminal obtains the signal quality of the cell corresponding to frequency point 4, and makes a further judgment based on the difference between the signal quality of the cell corresponding to frequency point 4 and the signal quality of the serving cell.

[0126] In some embodiments, for a target cell whose reselection priority is lower than that of a serving cell, for example, target cell 1 corresponding to frequency 4, if target cell 1 meets the low priority reselection condition. That is, the signal quality of the serving cell is relatively poor, the signal quality S1 of the serving cell (for example, -110db) is less than a preset first signal threshold (for example, the first signal threshold may be -100db), and at the same time, the signal quality of target cell 1 is relatively good, the signal quality S2 of target cell 1 (for example, -70db) is greater than a preset second signal threshold (for example, the second signal threshold may be -80db), in this case, although the reselection priority (0) of target cell 1 is relatively low, the signal quality of target cell 1 is relatively high, and the signal quality of target cell 1 is greater than the threshold value, that is, the signal quality of target cell 1 (-70db) is much higher than the signal quality of the serving cell (-110db), and if the low priority reselection condition is met, the target cell may be considered for cell reselection.

[0127] In some embodiments, the target cell may not meet the low priority condition, for example, the signal quality S2 of the target cell is less than the second signal threshold; for example, the signal quality S1 of the serving cell is greater than or equal to the preset first signal threshold; for example, the signal quality S1 of the serving cell is greater than or equal to the preset first signal threshold, and the signal quality S2 of the target cell is less than the preset second signal threshold.

[0128] In the case where the signal quality S1 of the serving cell is greater than or equal to the preset first signal threshold, or the signal quality S1 of the serving cell is greater than or equal to the preset first signal threshold and the signal quality S2 of the target cell is less than the preset second signal threshold, it means that the signal quality of the serving cell is not that bad, and the mobile terminal can reselect a cell from a non-serving cell with the same reselection priority as the serving cell, or not reselect a cell.

[0129] When the signal quality S2 of the target cell is less than the preset second signal threshold, there are multiple situations, including: for example, the signal quality of the serving cell is less than the first signal threshold, the signal quality of the serving cell is relatively poor, and the signal quality of the target cell is less than the second signal threshold, the signal quality of the target cell may also be relatively poor, and the signal quality of the target cell is lower than the signal quality of the serving cell; or, for example, the signal quality of the serving cell is less than the preset first signal threshold, the signal quality of the serving cell is relatively poor, and although the signal quality of the target cell is higher than the signal quality of the serving cell, the signal quality of the target cell does not reach the preset second signal threshold (threshold value), and therefore still does not meet the low-priority reselection condition. For such a target cell, if it cannot be reselected by the cell due to not meeting the low-priority reselection condition, it may cause the mobile terminal to lose an opportunity to reselect to a cell with higher signal quality. Therefore, in this embodiment, the mobile terminal can further judge the signal quality of the target cell and perform corresponding operations based on the difference between the signal quality of the target cell and the signal quality of the serving cell.

[0130] S204: When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, increase the reselection priority of the frequency point of the target cell.

[0131] In this embodiment, the signal difference result may include that the signal quality of the target cell is lower than or equal to (less than or equal to) the signal quality of the serving cell. Exemplarily, the signal difference result may be the absolute value of the difference between the signal quality of the target cell and the signal quality of the serving cell. For example, when the signal quality S2 of the target cell 2 corresponding to frequency 4 is -120db, when the signal quality S2 is less than the second signal threshold (-80db), the low priority reselection condition is not met. The mobile terminal obtains the difference result between the signal quality of the target cell 2 and the signal quality of the serving cell, and the signal quality S2 (-120db) of the target cell 2 is less than the signal quality S1 (-110db) of the serving cell. In the case where the signal quality of the target cell 2 is less than (or equal to) the signal quality of the serving cell, the mobile terminal will not obtain better communication quality or network quality by reselecting and residing in the cell, and the mobile terminal may not consider cell reselection for the cell.

[0132] In this embodiment, the signal difference result can also be that the signal quality of the target cell is higher (greater) than the signal quality of the serving cell. For example, when the signal quality S2 of the target cell 3 corresponding to frequency 4 is -81db, when the signal quality S2 is less than the second signal threshold (-80db), the low priority reselection condition is not met. The mobile terminal obtains the difference result between the signal quality of the target cell 3 and the signal quality of the serving cell, and the signal quality S2 (-81db) of the target cell 3 is greater than the signal quality S1 (-110db) of the serving cell. In this case, if the mobile terminal reselects and resides in the cell, it may obtain better communication quality or network quality, then the mobile terminal can consider reselecting the target cell 3. Since the reselection priority of the target cell 3 is lower than the reselection priority of the serving cell, the mobile terminal needs to increase the reselection priority of the frequency corresponding to the target cell 3 so that the target cell 3 can be considered by the mobile terminal for cell reselection.

[0133] In some embodiments, the mobile terminal may also increase the reselection priority of frequency 4 based on the common reselection priority of frequency 4 included in the system message. For example, referring to FIG3 , if the common reselection priority of frequency 4 included in the system message is 2, the mobile terminal may increase the reselection priority of frequency 4 from 0 to 2.

[0134] If the dedicated signaling (RRC release connection message) does not include the exclusive reselection priority of the frequency point to which the target cell belongs, and the target system message includes the common reselection priority (first priority) of the frequency point to which the target cell belongs, the mobile terminal can restore the reselection priority of the target cell to the common reselection priority.

[0135] For example, the shared reselection priority for frequency 4 is 2, but the reselection priority for frequency 4 is 0. This is because the system message includes the target cell's frequency (frequency 4) and its first priority (shared reselection priority), while the mobile terminal's dedicated signaling (RRC Release Continuation message) does not include the target cell's frequency (frequency 4). Therefore, the mobile terminal sets the reselection priority for the target cell (corresponding to frequency 4) to the preset priority. For an example, see the process for determining the reselection priority for frequency 4 shown in FIG3 .

[0136] Here, the preset priority may represent the lowest priority. For example, in an example where 0-7 is used to represent the frequency reselection priority, and a larger value indicates a higher priority, the preset priority may be 0. The first priority of the frequency (frequency 4) to which the target cell belongs in the system message is greater than 0.

[0137] In this case, the system message already includes the shared reselection priority of the frequency point (frequency 4) to which the target cell belongs. The mobile terminal can then restore the reselection priority of the frequency point to which the target cell belongs to its corresponding shared reselection priority.

[0138] Referring to FIG. 4 , FIG. 4 shows a flow chart of another cell method. After executing S203 to obtain the signal difference result of the target cell, S204 includes:

[0139] S2041. When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset first difference threshold, the mobile terminal determines the reselection priority of the target cell as the first priority.

[0140] Among them, the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, which means that the signal quality of the target cell is better than the signal quality of the serving cell. When the difference value (S2-S1) between the signal quality of the target cell and the signal quality of the serving cell is greater than the preset first difference threshold (threh1), the mobile terminal determines the reselection priority of the target cell as the first priority.

[0141] For example, the preset first difference threshold is 15dB. As shown in Figure 4 , the first priority of frequency 4 (the shared reselection priority in the system message) is 2. The RRC release connection message does not include the dedicated reselection priority for frequency 4, resulting in the reselection priority of frequency 4 being 0. The reselection priority of the serving cell (which belongs to frequency 1) is 2.

[0142] The signal quality of target cell 4 corresponding to frequency 4 is -81db, and the signal quality of the serving cell is (-110db). There is no non-serving cell with higher signal quality than the serving cell in the same reselection priority. For example, the signal quality of non-serving cell 1 corresponding to frequency 2 is -115db, and the signal quality of non-serving cell 2 corresponding to frequency 3 is -118db. The signal quality S2 (-81db) of the target cell (non-serving cell 4) is greater than the signal quality S1 (-110db) of the serving cell, and the difference between the signal quality S2 (-81db) of the target cell 4 and the signal quality S1 (-110db) of the serving cell is 29db, which is greater than the preset first difference threshold (15db).

[0143] In this case, the mobile terminal determines the reselection priority (0) of the target cell 4 as the first priority (2) of the frequency point 4.

[0144] In this embodiment, the mobile terminal can restore the reselection priority of the target cell to the common reselection priority corresponding to the frequency point to which the target cell belongs in the system message, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, thereby avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0145] Alternatively, in some embodiments, if the shared reselection priority of the frequency point to which the target cell belongs contained in the system message is lower than the reselection priority of the frequency point to which the serving cell belongs. Furthermore, since the dedicated signaling (RRC release connection message) does not include the exclusive reselection priority of the frequency point to which the target cell belongs, the reselection priority of the frequency point to which the target cell belongs is set to the lowest priority. In this case, the mobile terminal restores the reselection priority of the target cell from the lowest priority to the shared reselection priority of the frequency point to which the target cell belongs in the system message, and the result is still that the reselection priority of the frequency point to which the target cell belongs is lower than the reselection priority of the frequency point to which the serving cell belongs. The target cell will still not be reselected by the mobile terminal because it cannot meet the low-priority reselection condition.

[0146] In this case, the mobile terminal may increase the reselection priority of the frequency point of the target cell to the reselection priority of the frequency point of the serving cell, so that the reselection priority of the frequency point of the target cell is the same as the reselection priority of the frequency point of the serving cell.

[0147] Referring to FIG. 5 , FIG. 5 shows a flow chart of another cell method. After executing S203 to obtain the signal difference result of the target cell, S204 includes:

[0148] S2042. When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset second difference threshold, if the first priority is less than the reselection priority of the serving cell, the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0149] Among them, the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, which means that the signal quality of the target cell is better than the signal quality of the serving cell. When the common reselection priority of the frequency point to which the target cell belongs is still lower than the reselection priority of the serving cell, when the difference value (S2-S1) between the signal quality of the target cell and the signal quality of the serving cell is greater than the preset second difference threshold (threh2), the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0150] For example, the preset second difference threshold is 20dB. As shown in Figure 5 , the first priority of frequency 4 (the shared reselection priority in the system message) is 1. The RRC release connection message does not include the dedicated reselection priority for frequency 4, resulting in the reselection priority of frequency 4 being 0. The reselection priority of the serving cell (which belongs to frequency 1) is 2.

[0151] The signal quality of target cell 4 corresponding to frequency 4 is -81db, and the signal quality of the serving cell is (-110db). There is no non-serving cell with higher signal quality than the serving cell in the same reselection priority. For example, the signal quality of non-serving cell 1 corresponding to frequency 2 is -115db, and the signal quality of non-serving cell 2 corresponding to frequency 3 is -118db. The signal quality S2 (-81db) of the target cell (non-serving cell 4) is greater than the signal quality S1 (-110db) of the serving cell, and the difference between the signal quality S2 (-81db) of the target cell 4 and the signal quality S1 (-110db) of the serving cell is 29db, which is greater than the preset second difference threshold (20db).

[0152] In this case, if the mobile terminal determines the first priority (1) of frequency 4 as the reselection priority of the target cell 4, the reselection priority (1) of the target cell 4 is still lower than the reselection priority (2) of the serving cell. At this time, the mobile terminal determines the reselection priority (2) of the serving cell (that is, the second priority of the serving cell) as the reselection priority (2) of the target cell.

[0153] In this embodiment, the mobile terminal can increase the reselection priority of the target cell to the reselection priority of the serving cell, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0154] Alternatively, in some embodiments, if the dedicated signaling (RRC release connection message) includes the dedicated reselection priority (second priority) of the frequency point to which the target cell belongs, but the dedicated reselection priority of the frequency point to which the target cell belongs is still lower than the reselection priority of the serving cell, the mobile terminal can increase the reselection priority of the target cell to the reselection priority of the serving cell.

[0155] For example, if the shared reselection priority of frequency 4 is 1, the dedicated reselection priority of frequency 4 is 1. The dedicated reselection priority of frequency 4 or the shared reselection priority of frequency 4 is lower than the reselection priority (2) of frequency 1 to which the serving cell belongs.

[0156] In these cases, the mobile terminal may increase the reselection priority of the frequency point to which the target cell belongs to to the reselection priority of the frequency point to which the serving cell belongs.

[0157] 6 , which shows a flow chart of another cell method, after executing S203 to obtain the signal difference result of the target cell, S204 includes:

[0158] S2043. When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset third difference threshold, the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0159] Among them, the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, which means that the signal quality of the target cell is better than the signal quality of the serving cell. When the common reselection priority and the dedicated reselection priority of the frequency point to which the target cell belongs are still lower than the reselection priority of the serving cell, when the difference value (S2-S1) between the signal quality of the target cell and the signal quality of the serving cell is greater than the preset third difference threshold (threh3), the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0160] For example, the preset third difference threshold is 20dB. The preset third difference threshold can be the same as the preset second threshold. Referring to Figure 6, the first priority of frequency 4 (the shared reselection priority in the system message) is 1, the dedicated reselection priority of frequency 4 in the RRC release connection message is 1, and the reselection priority of frequency 4 is 1. The reselection priority of the serving cell (which belongs to frequency 1) is 2.

[0161] The signal quality of target cell 4 corresponding to frequency 4 is -81db, and the signal quality of the serving cell is (-110db). There is no non-serving cell with higher signal quality than the serving cell in the same reselection priority. For example, the signal quality of non-serving cell 1 corresponding to frequency 2 is -115db, and the signal quality of non-serving cell 2 corresponding to frequency 3 is -118db. The signal quality S2 (-81db) of the target cell (non-serving cell 4) is greater than the signal quality S1 (-110db) of the serving cell, and the difference between the signal quality S2 (-81db) of the target cell 4 and the signal quality S1 (-110db) of the serving cell is 29db, which is greater than the preset third difference threshold (20db).

[0162] In this case, the dedicated reselection priority (1) of frequency point 4 is the reselection priority of target cell 4. The reselection priority (1) of target cell 4 is lower than the reselection priority (2) of the serving cell. At this time, the mobile terminal determines the reselection priority (2) of the serving cell as the reselection priority (2) of the target cell.

[0163] In this embodiment, the mobile terminal can increase the reselection priority of the target cell to the reselection priority of the serving cell, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0164] Alternatively, in some embodiments, the mobile terminal may also increase the reselection priority (0) of the target cell 3 (corresponding to frequency 4) to a specified reselection priority, which may be equal to or higher than the reselection priority of the serving cell. For example, the reselection priority of frequency 4 may be increased from 0 to 3.

[0165] The system message of the mobile terminal may include the frequency of the serving cell and the reselection priority of the frequency of the serving cell. The mobile terminal may directly increase the reselection priority of the target cell to be equal to or higher than the reselection priority of the serving cell based on the reselection priority of the frequency of the serving cell.

[0166] Referring to FIG. 7 , FIG. 7 shows a flow chart of another cell method. After executing S203 to obtain the signal difference result of the target cell, S204 includes:

[0167] S2044. When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset fourth difference threshold, the mobile terminal determines the reselection priority of the target cell as the third priority.

[0168] The third priority is higher than or equal to the reselection priority of the serving cell.

[0169] Among them, the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, which means that the signal quality of the target cell is better than the signal quality of the serving cell. When the difference value (S2-S1) between the signal quality of the target cell and the signal quality of the serving cell is greater than the preset fourth difference threshold (threh4), the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

[0170] For example, the fourth difference threshold is preset to 25dB. As shown in Figure 7 , the shared reselection priority for frequency 4 is 1, and the RRC release connection message does not include the dedicated reselection priority for frequency 4, resulting in a reselection priority of 0 for frequency 4. The reselection priority of the serving cell (which belongs to frequency 1) is 2.

[0171] The signal quality of target cell 4 corresponding to frequency 4 is -81db, and the signal quality of the serving cell is (-110db). There is no non-serving cell with higher signal quality than the serving cell in the same reselection priority. For example, the signal quality of non-serving cell 1 corresponding to frequency 2 is -115db, and the signal quality of non-serving cell 2 corresponding to frequency 3 is -118db. The signal quality S2 (-81db) of the target cell (non-serving cell 4) is greater than the signal quality S1 (-110db) of the serving cell, and the difference between the signal quality S2 (-81db) of the target cell 4 and the signal quality S1 (-110db) of the serving cell is 29db, which is greater than the preset third difference threshold (25db).

[0172] In this case, the mobile terminal may directly determine the reselection priority of frequency 4 as the third priority. For example, the third priority may be the reselection priority (2) of the serving cell, or the third priority may be a priority (3) higher than the reselection priority of the serving cell.

[0173] In this embodiment, the mobile terminal can directly increase the reselection priority of the target cell to a level higher than or equal to the reselection priority of the frequency point to which the serving cell belongs, so that the target cell with higher signal quality can be considered by the mobile terminal for cell reselection, thereby avoiding the mobile terminal failing to reselect a cell with good signal quality but low reselection priority during cell reselection, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality.

[0174] S205: The mobile terminal performs cell reselection based on the frequency point of the target cell with the increased reselection priority and the priority of the frequencies of other non-serving cells.

[0175] In this embodiment, the frequency point of the target cell to which the reselection priority is increased and the priority points of the frequencies of other non-serving cells can be referred to in the examples after the reselection priority is adjusted in FIG. 4 to FIG. 7 .

[0176] If the reselection priority of the target cell is not increased, the signal quality of the non-service cell 3 (target cell) is -81db, which is less than the preset second signal threshold (-80db) and does not meet the low priority reselection condition. Then, the mobile terminal will reselect the cell in the non-service cell 1 and the non-service cell 2, and the signal quality of the non-service cell 1 is -115db and the signal quality of the non-service cell 2 is -118db, which means that the mobile terminal cannot select a cell with better signal quality.

[0177] After the reselection priority of the target cell is increased, the reselection priority of non-serving cell 3 (target cell) is 2 or 3, which is equal to or higher than the reselection priority of the serving cell. In this case, the mobile terminal can reselect from non-serving cell 1, non-serving cell 2, and non-serving cell 3 based on the R criterion or the high-priority reselection rule. In this case, the mobile terminal is likely to select non-serving cell 3 with better signal quality, thereby improving the effectiveness of the mobile terminal's cell reselection and ensuring that the cell accessed by the mobile terminal after cell reselection is a cell with higher signal quality. This can provide the mobile terminal with higher network quality and communication quality, thereby optimizing the user experience.

[0178] In this embodiment, when a mobile terminal performs cell reselection based on the corresponding reselection priorities of each cell, it may first detect the signal quality of each cell. If there is a target cell whose reselection priority is lower than that of the mobile terminal's serving cell and does not meet the low-priority reselection criteria, the signal quality difference between the target cell and the serving cell may be further determined. If the signal quality of the target cell is better than that of the serving cell, the reselection priority of the target cell may be increased, thereby increasing the likelihood that the mobile terminal will reselect to the target cell with higher signal quality. For example, the reselection priority of cell 1 is lower than that of the serving cell, but the signal quality of cell 1 is less than a preset second signal threshold and does not meet the low-priority reselection criteria. The mobile terminal further determines that the signal quality of cell 1 is better than that of the serving cell. In this case, the reselection priority of cell 1 is increased, providing the mobile terminal with a cell with both a higher reselection priority and higher signal quality as an alternative. This application can prevent the mobile terminal from failing to reselect a cell with good signal quality but a low reselection priority during cell reselection, thereby improving the effectiveness of cell reselection for the mobile terminal and ensuring that the cell the mobile terminal accesses after cell reselection is a cell with higher signal quality.

[0179] In order not to affect the services being executed by the mobile terminal or the communication quality of the mobile terminal, in some embodiments, when the mobile terminal is in an idle state, the mobile terminal detects the signal quality of each cell.

[0180] In this embodiment, the mobile terminal is in the RRC idle state, which means that the mobile terminal is not communicating with the network. In this state, measurement of each cell can be triggered to obtain the measurement results of the signal quality of each cell. Measuring the signal quality of each cell when the mobile terminal is in the idle state can reduce the impact of the mobile terminal's cell measurement on the mobile terminal's services, while also providing more communication resources for cell measurement.

[0181] In some embodiments, if the signal quality of the serving cell of the mobile terminal is relatively poor, the mobile terminal may be triggered to perform cell measurement.

[0182] In some embodiments, when the signal quality of the serving cell is less than a preset third signal threshold, the mobile terminal detects the signal quality of each cell; the preset third signal threshold is greater than the preset first signal threshold.

[0183] In this embodiment, the third signal threshold can be understood as the upper limit of the serving cell measurement. If the signal quality of the serving cell is lower than the upper limit, it means that the signal quality of the serving cell has deteriorated, which can trigger cell measurement and reselection to a cell with better signal quality. The third signal threshold is different from the first signal threshold in the above embodiment. The first signal threshold can be understood as triggering the mobile terminal to reselect a cell from a cell with a lower reselection priority. Generally, only when the quality result of the serving cell is relatively poor will the signal quality of a cell with a lower reselection priority than the serving cell be considered. Therefore, the first signal threshold is smaller than the third signal threshold. For example, the first signal threshold can be -100dB, and the third signal threshold can be -80dB.

[0184] In this embodiment, when the signal quality of the serving cell is less than the third signal threshold, the mobile terminal can be triggered to detect the signal quality of each cell, so that the mobile terminal can switch to a cell with higher signal quality in a timely manner, thereby ensuring the communication quality of the mobile terminal and the network fluency of other services, and optimizing the user's communication experience.

[0185] The cell reselection method provided in the embodiment of the present application can be applied to a mobile terminal.

[0186] The mobile terminal 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a sensor module 180, and a subscriber identification module (SIM) card interface 190, etc.

[0187] It is understood that the structures illustrated in the embodiments of the present invention do not constitute specific limitations on the mobile terminal 100. In other embodiments of the present application, the mobile terminal 100 may include more or fewer components than shown, or may combine or separate certain components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0188] The processor 110 may include one or more processing units. For example, 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). The different processing units may be independent devices or integrated into one or more processors.

[0189] The controller may be the nerve center and command center of the mobile terminal 100. The controller may generate an operation control signal according to the instruction operation code and the timing signal to complete the control of fetching and executing instructions.

[0190] Processor 110 may also include a memory for storing instructions and data. In some embodiments, the memory in processor 110 is a cache memory. This memory can store instructions or data that have just been used or are being recycled by processor 110. If processor 110 needs to use the same instruction or data again, it can directly access the memory. This avoids duplicate accesses, reduces processor 110 latency, and thus improves system efficiency.

[0191] In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (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.

[0192] It is understood that the interface connection relationship between the modules illustrated in the embodiment of the present invention is merely an illustrative illustration and does not constitute a structural limitation on the mobile terminal 100. In other embodiments of the present application, the mobile terminal 100 may also adopt different interface connection methods from the above embodiments, or a combination of multiple interface connection methods.

[0193] The charging management module 140 is configured to receive charging input from a charger. The charger can be either a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 can receive charging input from the wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 can receive wireless charging input via the wireless charging coil of the mobile terminal 100. While charging the battery 142, the charging management module 140 can also provide power to the mobile terminal via the power management module 141.

[0194] 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, and the wireless communication module 160. The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle count, and battery health status (leakage, impedance). In some other embodiments, the power management module 141 can also be provided in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 can also be provided in the same device.

[0195] The wireless communication function of the mobile terminal 100 can be implemented through the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor and the baseband processor.

[0196] Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in mobile terminal 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve antenna utilization. For example, antenna 1 can be reused as a diversity antenna for a wireless local area network. In other embodiments, the antennas can be used in conjunction with a tuning switch.

[0197] The mobile communication module 150 can provide solutions for wireless communications including 2G / 3G / 4G / 5G applied to the mobile terminal 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves from the antenna 1, and filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the same device as at least some of the modules of the processor 110.

[0198] The modem processor may include a modulator and a demodulator. The modulator is used to modulate the low-frequency baseband signal to be sent into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After being processed by the baseband processor, the low-frequency baseband signal is passed to the application processor. The application processor outputs a sound signal through an audio device (not limited to a speaker, a receiver, etc.) or displays an image or video through a display screen. In some embodiments, the modem processor may be an independent device. In other embodiments, the modem processor may be independent of the processor 110 and be set in the same device as the mobile communication module 150 or other functional modules.

[0199] The wireless communication module 160 can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc. applied on the mobile terminal 100. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, frequency modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110. The wireless communication module 160 can also receive the signal to be sent from the processor 110, frequency modulate it, amplify it, and convert it into electromagnetic waves for radiation through the antenna 2.

[0200] In some embodiments, antenna 1 of the mobile terminal 100 is coupled to the mobile communication module 150, and antenna 2 is coupled to the wireless communication module 160, so that the mobile terminal 100 can communicate with a network and other devices via wireless communication technologies. The wireless communication technologies may include GSM, general packet radio service (GPRS), code division multiple access (CDMA), WCDMA, time-division code division multiple access (TD-SCDMA), LTE, BT, GNSS, WLAN, NFC, FM, and / or IR technology. The GNSS may include a global positioning system (GPS), a global navigation satellite system (GLONASS), a Beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and / or a satellite-based augmentation system (SBAS).

[0201] In this embodiment, the system message broadcast by the radio access network and the RRC release connection message sent by the base station can be received through the mobile communication module or the wireless communication module. When performing cell reselection, the processor 110 can perform cell measurement through the mobile communication module or the wireless communication module. The processor 110 performs an operation to increase the reselection priority of the target cell based on the measurement results of each cell, the system message, and the reselection priority of the frequency point carried in the RRC release connection message.

[0202] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the mobile terminal 100. The external memory card communicates with the processor 110 via the external memory interface 120 to implement data storage functions. For example, files such as music and videos can be stored on the external memory card.

[0203] The internal memory 121 can be used to store computer executable program codes, which include instructions. The processor 110 executes various functional applications and data processing of the mobile terminal 100 by running the instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area can store data created during the use of the mobile terminal 100 (such as audio data, a phone book, etc.), etc. In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0204] The mobile terminal 100 can implement audio functions such as music playback and recording through the audio module 170, a speaker, a receiver, a microphone, an earphone jack, and an application processor.

[0205] The audio module 170 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. The audio module 170 can also be used to encode and decode audio signals. In some embodiments, the audio module 170 can be provided in the processor 110, or some functional modules of the audio module 170 can be provided in the processor 110.

[0206] The SIM card interface 190 is used to connect a SIM card. The SIM card can be connected to and disconnected from the mobile terminal 100 by inserting it into or removing it from the SIM card interface 190. The mobile terminal 100 can support one or N SIM card interfaces, where N is a positive integer greater than one. The SIM card interface 190 can support Nano SIM cards, Micro SIM cards, SIM cards, and the like. Multiple cards can be inserted into the same SIM card interface 190 at the same time. The types of the multiple cards can be the same or different. The SIM card interface 190 can also be compatible with different types of SIM cards. The SIM card interface 190 can also be compatible with external memory cards. The mobile terminal 100 interacts with the network through the SIM card to implement functions such as calls and data communications. In some embodiments, the mobile terminal 100 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the mobile terminal 100 and cannot be separated from the mobile terminal 100.

[0207] An embodiment of the present application also provides a chip system (e.g., a system on a chip (SoC)). As shown in FIG9 , the chip system includes at least one processor 701 and at least one interface circuit 702. The processor 701 and the interface circuit 702 can be interconnected via lines. For example, the interface circuit 702 can be used to receive signals from other devices (e.g., a memory of a mobile terminal). For another example, the interface circuit 702 can be used to send signals to other devices (e.g., a processor 701 or a camera of a mobile terminal). Exemplarily, the interface circuit 702 can read instructions stored in the memory and send the instructions to the processor 701. When the instructions are executed by the processor 701, the mobile terminal can execute the various steps in the above embodiments. Of course, the chip system can also include other discrete components, which are not specifically limited in the embodiments of the present application.

[0208] An embodiment of the present application also provides a computer-readable storage medium, which includes computer instructions. When the computer instructions are executed on the above-mentioned mobile terminal, the mobile terminal executes the various functions or steps executed by the mobile terminal in the above-mentioned method embodiment.

[0209] The present application also provides a computer program product, which, when executed on a computer, enables the computer to execute the functions or steps executed by the mobile terminal in the above method embodiment. For example, the computer may be the above mobile terminal.

[0210] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0211] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0212] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0213] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0214] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0215] The above content is only a specific embodiment of this application, but the scope of protection of this application is not limited to this. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A cell reselection method, characterized in that: The method comprises: The mobile terminal obtains the reselection priority of each cell; The mobile terminal detects the signal quality of each cell; When the reselection priority of the target cell is lower than the reselection priority of the serving cell of the mobile terminal, and the target cell does not meet the low priority reselection condition, obtaining a signal difference result of the target cell; the target cell is any non-serving cell among the cells except the serving cell, and the target cell does not meet the low priority reselection condition including that the signal quality of the serving cell is greater than or equal to a preset first signal threshold, and / or the signal quality of the target cell is less than a preset second signal threshold; When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, increasing the reselection priority of the frequency point to which the target cell belongs; The mobile terminal performs cell reselection based on the frequency point of the target cell with an increased reselection priority and the priority of the frequencies of other non-serving cells.

2. The method according to claim 1, characterized in that The system message of the mobile terminal includes the frequency to which the target cell belongs and the first priority of the frequency to which the target cell belongs, the dedicated signaling of the mobile terminal does not include the frequency to which the target cell belongs, the reselection priority of the target cell is a preset priority, and the first priority is higher than the preset priority; When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, increasing the reselection priority of the frequency point of the target cell, including: When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset first difference threshold, the mobile terminal determines the reselection priority of the target cell as the first priority.

3. The method according to claim 1 or 2, characterized in that: The system message of the mobile terminal includes the frequency to which the target cell belongs and the first priority of the frequency to which the target cell belongs, the dedicated signaling of the mobile terminal does not include the frequency to which the target cell belongs, the reselection priority of the target cell is a preset priority, and the first priority is higher than the preset priority; When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, raising the reselection priority of the frequency point of the target cell includes: When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset second difference threshold, if the first priority is less than the reselection priority of the serving cell, the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

4. The method according to any one of claims 1 to 3, characterized in that The dedicated signaling of the mobile terminal includes the frequency point to which the target cell belongs and the second priority point of the frequency point to which the target cell belongs; the second priority point is lower than the reselection priority point of the serving cell; When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, increasing the reselection priority of the frequency point of the target cell, including: The signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset third difference threshold, the mobile terminal determines the reselection priority of the target cell as the reselection priority of the serving cell.

5. The method according to any one of claims 1 to 4, characterized in that When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, increasing the reselection priority of the frequency point of the target cell, including: When the signal difference result indicates that the signal quality of the target cell is greater than the signal quality of the serving cell, and the difference between the signal quality of the target cell and the signal quality of the serving cell is greater than a preset fourth difference threshold, the mobile terminal determines the reselection priority of the target cell as a third priority, and the third priority is higher than or equal to the reselection priority of the serving cell.

6. The method according to any one of claims 1 to 5, characterized in that The system message of the mobile terminal includes a first frequency point set, the dedicated instruction of the mobile terminal includes a second frequency point set, and the intersection of the first frequency point set and the second frequency point set includes at least the frequency point to which the serving cell belongs; The mobile terminal detecting the signal quality of each cell includes: Detecting, by the mobile terminal, a signal quality of a cell covered by the first frequency point set; The mobile terminal detects signal quality of a cell covered by the second frequency point set.

7. The method according to any one of claims 1 to 6, characterized in that The mobile terminal detecting the signal quality of each cell includes: When the signal quality of the serving cell is less than a preset third signal threshold, the mobile terminal detects the signal quality of each cell; the preset third signal threshold is greater than the preset first signal threshold.

8. The method according to any one of claims 1 to 7, characterized in that The mobile terminal detecting the signal quality of each cell includes: When the mobile terminal is in an idle state, the mobile terminal detects the signal quality of each cell.

9. The method according to any one of claims 1 to 8, characterized in that The system message of the mobile terminal includes the fourth priority of each frequency point in the first frequency point set, and the dedicated signaling of the mobile terminal includes the fifth priority of each frequency point in the second frequency point set; The mobile terminal obtains the reselection priority of each cell, including: If the first frequency point set and the second frequency point set both include the first frequency point, the reselection priority of the first frequency point is the fifth priority of the first frequency point; If the first frequency point set includes the second frequency point, and the second frequency point set does not include the second frequency point, the reselection priority of the second frequency point is the preset priority; Among them, the preset priority is lower than the fifth priority, the preset priority is lower than the fourth priority, and the preset priority is lower than the reselection priority of the serving cell.

10. A mobile terminal, characterized in that: The mobile terminal includes a communication interface, a memory and one or more processors; the communication interface and the memory are coupled to the processor; the memory stores computer program code, the computer program code includes computer instructions, and when the computer instructions are executed by the processor, the mobile terminal executes the method as described in any one of claims 1-9.

11. A computer-readable storage medium, characterized in that: The method comprises computer instructions, and when the computer instructions are executed on a mobile terminal, the mobile terminal is caused to execute the method according to any one of claims 1 to 9.

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