Cell access method, electronic device, chip system, and storage medium

Abstract

The present application relates to the technical field of communications, and discloses a cell access method, an electronic device, a chip system, and a storage medium. The method comprises: after an electronic device receives a redirect message sent by a target cell, if accessing a cell corresponding to a redirection frequency point carried in the redirect message fails, determining a first count, the first count being the number of failures within a first preset duration before the current moment to access the cell corresponding to the redirection frequency point indicated by the target cell; and if the first count is greater than or equal to a first count threshold, accessing a cell other than the target cell. In this way, subsequent redirection can be prevented from reoccurring to a certain extent, and even if subsequent redirection occurs, the problem of an electronic device failing to access a cell corresponding to a redirection frequency point can be prevented to a certain extent. Thus, repeated redirection within a short time can be prevented for electronic devices to a certain extent, and, accordingly, the problem of lags in or even interruption of a service can be prevented to a certain extent.

Description

Cell access method, electronic device, chip system and storage medium

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 18, 2023, with application number 202311759819.1 and application name “Cell Access Method, Electronic Device, Chip System and Storage Medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a cell access method, electronic device, chip system and storage medium. Background Art

[0003] Currently, when the signal quality of the serving cell falls below a threshold, user equipment (UE) can report an A2 event to the serving cell, hoping that the serving cell will issue an instruction for the UE to switch to another cell. After receiving the A2 event, the serving cell can send a redirection message to the UE. The UE can then access the cell corresponding to the redirection frequency carried in the redirection message. However, in actual situations, due to various factors, it is easy for the UE to fail to access the cell corresponding to the redirection frequency, which can cause service lag or even interruption.

[0004] Summary of the Invention

[0005] This application provides a cell access method, electronic device, chip system, and storage medium that can, to a certain extent, avoid service freezes or even interruptions. The technical solution is as follows:

[0006] In a first aspect, a cell access method is provided. In this method, an electronic device receives a redirection message sent by a target cell. Thereafter, the electronic device accesses a cell corresponding to a redirection frequency carried in the redirection message. If access to the cell corresponding to the redirection frequency carried in the redirection message fails, a first count is determined, where the first count is the number of failed attempts to access the cell corresponding to the redirection frequency indicated by the target cell within a first preset time period before the current moment. If the first count is greater than or equal to a first count threshold, a first strategy is implemented, which is to access a cell other than the target cell.

[0007] If the first number is greater than or equal to the first number threshold, it means that the electronic device has tried to access the cell corresponding to the redirected frequency indicated by the target cell multiple times in a short period of time but failed. In this case, it is reasonable to suspect that this problem is likely caused by the target cell. For this reason, in this application, after the electronic device fails to access the cell corresponding to the redirected frequency, it will be banned from the target cell if the first number is greater than or equal to the first number threshold, that is, it will access a cell other than the target cell. This cell can be a neighboring cell of the same system as the target cell, or a neighboring cell of a different system from the target cell.

[0008] After an electronic device accesses a cell other than the target cell, it can, on the one hand, avoid the problem of repeated redirection due to low cell signal quality. On the other hand, even if redirection is required later, the redirection frequency indicated by the cell other than the target cell is likely different from the redirection frequency indicated by the target cell, thus avoiding the problem of the electronic device failing to access the cell corresponding to the redirection frequency. This can, to a certain extent, prevent electronic devices from being repeatedly redirected in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0009] Optionally, after receiving the redirection message, if the electronic device fails to search for a cell corresponding to the redirection frequency carried in the redirection message, it determines that access to the cell corresponding to the redirection frequency carried in the redirection message has failed.

[0010] In blind redirection, the target cell directly specifies a redirection frequency. In this case, there may not be a cell corresponding to the redirection frequency near the electronic device, resulting in the electronic device failing to access the cell corresponding to the redirection frequency.

[0011] Optionally, if the electronic device fails to access the cell corresponding to the redirected frequency carried in the redirection message, the operation of determining the first number may be: if the electronic device fails to access the cell corresponding to the redirected frequency carried in the redirection message, then if the cell identifier of the target cell is not a problem cell identifier, the electronic device determines the first number. If the cell identifier of the target cell is a problem cell identifier, the electronic device directly executes the first strategy.

[0012] The problem cell identifiers may be cell identifiers pre-recorded by the electronic device. Problem cell identifiers are used to identify problem cells. If an electronic device fails to access a cell corresponding to the redirection frequency indicated by a cell multiple times, the electronic device may record the cell as a problem cell. Therefore, if the electronic device fails to access the cell corresponding to the redirection frequency carried in the redirection message, and the cell identifier of the target cell is a problem cell identifier, i.e., if the target cell is a problem cell, the electronic device may directly implement the first strategy to access a cell other than the target cell.

[0013] Optionally, after the electronic device determines the first number, if the first number is greater than or equal to a first number threshold, the cell identifier of the target cell may be recorded as a problem cell identifier.

[0014] Optionally, if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, the operation of determining the first number can be: if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, the electronic device determines the first number if the first strategy has not been executed within the fifth preset time period before the current moment.

[0015] As an example, if the electronic device fails to access the cell corresponding to the redirected frequency carried by the redirection message, then if the first strategy has been executed within the fifth preset time period before the current moment, a second number is determined, and the second number is the number of failures to access the cell corresponding to the redirected frequency indicated by the cell corresponding to the target frequency within the second preset time period before the current moment, and the target frequency is the frequency of the target cell; if the second number is greater than or equal to the second number threshold, the second strategy is executed, and the second strategy is: access a cell corresponding to a frequency other than the target frequency.

[0016] As another example, if the electronic device fails to access the cell corresponding to the redirected frequency carried by the redirection message, then if the first strategy has been executed within the fifth preset time period before the current moment, the third number is determined, and the third number is the number of times the access to the cell corresponding to the redirected frequency has failed within the third preset time period before the current moment; if the third number is greater than or equal to the third number threshold, the third strategy is executed, and the third strategy is: access a cell, and send target information to the cell after accessing the cell, the target information is used to indicate that the electronic device does not support the specified frequency band, and the specified frequency band is the frequency band where the redirected frequency is located.

[0017] In a second aspect, a cell access method is provided. In this method, an electronic device receives a redirection message sent by a target cell. Thereafter, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message. If access to the cell corresponding to the redirection frequency carried in the redirection message fails, a second number is determined, where the second number is the number of failed attempts to access the cell corresponding to the redirection frequency indicated by the cell corresponding to the target frequency within a second preset time period before the current moment, where the target frequency is the frequency of the target cell. If the second number is greater than or equal to a second number threshold, a second strategy is executed, which is: access a cell corresponding to a frequency other than the target frequency.

[0018] If the second number is greater than or equal to the second number threshold, it means that the electronic device has tried to access the cell corresponding to the redirected frequency indicated by the cell corresponding to the target frequency multiple times in a short period of time and failed. In this case, it is reasonable to suspect that the cells corresponding to the target frequency are likely to have this problem. For this reason, in this application, after the electronic device fails to access the cell corresponding to the redirected frequency, it will be banned from the target frequency if the second number is greater than or equal to the second number threshold, that is, it will access a cell corresponding to a frequency other than the target frequency. This cell can be a neighboring cell of the same system as the target cell, or a neighboring cell of a different system from the target cell.

[0019] After an electronic device accesses a cell corresponding to a frequency other than the target frequency, it can, to a certain extent, avoid the problem of repeated redirection due to low cell signal quality. Furthermore, even if redirection is required later, the redirection frequency indicated by the cell corresponding to the frequency other than the target frequency is likely different from the redirection frequency indicated by the cell corresponding to the target frequency. This can, to a certain extent, prevent the electronic device from failing to access the cell corresponding to the redirection frequency. This can, to a certain extent, prevent the electronic device from repeatedly redirecting in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0020] Optionally, after receiving the redirection message, if the electronic device fails to search for a cell corresponding to the redirection frequency carried in the redirection message, it determines that access to the cell corresponding to the redirection frequency carried in the redirection message has failed.

[0021] In blind redirection, the target cell directly specifies a redirection frequency. In this case, there may not be a cell corresponding to the redirection frequency near the electronic device, resulting in the electronic device failing to access the cell corresponding to the redirection frequency.

[0022] Optionally, if the electronic device fails to access the cell corresponding to the redirected frequency carried in the redirection message, the operation of determining the second number may be: if the electronic device fails to access the cell corresponding to the redirected frequency carried in the redirection message, if the target frequency is not a problem frequency, the electronic device determines the second number. If the target frequency is a problem frequency, the electronic device directly implements the second strategy.

[0023] Problem frequencies may be frequencies pre-recorded by the electronic device. If the electronic device repeatedly fails to access the cell corresponding to the redirected frequency indicated by the cell corresponding to a certain frequency, the electronic device may record this frequency as a problem frequency. Therefore, if the electronic device fails to access the cell corresponding to the redirected frequency carried in the redirection message, and the target cell is the problem frequency, the electronic device may directly implement the second strategy to access a cell corresponding to a frequency other than the target frequency.

[0024] Optionally, after the electronic device determines the second number, if the second number is greater than or equal to a second number threshold, the target frequency point may be recorded as a problem frequency point.

[0025] Optionally, if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, the operation of determining the second number can be: if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, the second number is determined if the second strategy has not been executed within the fifth preset time period before the current moment.

[0026] As an example, if the electronic device fails to access the cell corresponding to the redirected frequency carried by the redirection message, then if the second strategy has been executed within the fifth preset time period before the current moment, the third number is determined, and the third number is the number of times the access to the cell corresponding to the redirected frequency point has failed within the third preset time period before the current moment; if the third number is greater than or equal to the third number threshold, the third strategy is executed, and the third strategy is: access a cell, and send target information to the cell after accessing the cell, the target information is used to indicate that the electronic device does not support the specified frequency band, and the specified frequency band is the frequency band where the redirected frequency point is located.

[0027] In a third aspect, a cell access method is provided. In this method, an electronic device receives a redirection message sent by a target cell. Subsequently, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message, where the frequency band of the redirection frequency is a designated frequency band. If access to the cell corresponding to the redirection frequency fails, a third number is determined, which is the number of failed attempts to access the cell corresponding to the redirection frequency within a third preset time period before the current moment. If the third number is greater than or equal to the third number threshold, a third strategy is executed, which is: access a cell and, after accessing the cell, send target information to the cell, where the target information is used to indicate that the electronic device does not support the designated frequency band.

[0028] If the third number is greater than or equal to the third number threshold, it means that the electronic device has tried to access the cell corresponding to the redirected frequency many times before but failed. In this case, it is reasonable to suspect that there is a problem with the frequency band (i.e., the designated frequency band) where the redirected frequency is located. For this reason, in this application, after the electronic device fails to access the cell corresponding to the redirected frequency, if the third number is greater than or equal to the third number threshold, it can first access a cell, and then send target information to this cell after accessing this cell. Since the target information indicates that the electronic device does not support the designated frequency band, the cell can know that the electronic device does not support the designated frequency band after receiving the target information. Then, when redirection is required later, the redirected frequency indicated by this cell is likely not to be a frequency within the designated frequency band, and thus the problem of failure of the electronic device to access the cell corresponding to the redirected frequency can be avoided to a certain extent. In this way, repeated redirection of electronic devices in a short period of time can be avoided to a certain extent, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0029] It should be noted that in this application, although the electronic device sends target information to the cell to indicate that it does not support the specified frequency band, this is to prevent the cell from subsequently redirecting the electronic device to the specified frequency band, and does not mean that the electronic device actually does not support the specified frequency band. In other words, even if the electronic device supports the specified frequency band, the target information will be sent to the cell in the above situation to make the cell believe that the electronic device does not support the specified frequency band.

[0030] Optionally, after receiving the redirection message, if the electronic device fails to search for a cell corresponding to the redirection frequency carried in the redirection message, it determines that access to the cell corresponding to the redirection frequency carried in the redirection message has failed.

[0031] In blind redirection, the target cell directly specifies a redirection frequency. In this case, there may not be a cell corresponding to the redirection frequency near the electronic device, resulting in the electronic device failing to access the cell corresponding to the redirection frequency.

[0032] Optionally, the target information is UE capability information. The electronic device may send the target information to the cell by: sending a mobility registration update message to the cell, the mobility registration update message being used to indicate that the UE capability information needs to be updated; receiving a UE capability query message sent by the cell; and sending UE capability information to the cell, the UE capability information being used to indicate that the electronic device does not support a specified frequency band.

[0033] In this application, after accessing the cell, the electronic device can actively trigger the mobility registration update process so that the cell queries the UE capability information. In this way, the electronic device can report the UE capability information to the cell to indicate that it does not support the specified frequency band.

[0034] Optionally, if the electronic device fails to access the cell corresponding to the redirected frequency, the operation of determining the third number may be: if access to the cell corresponding to the redirected frequency fails, if the cell identifier of the target cell is not a problem cell identifier and the frequency of the target cell is not a problem frequency, determining the third number. If the cell identifier of the target cell is a problem cell identifier and / or the frequency of the target cell is a problem frequency, executing the third strategy.

[0035] In a fourth aspect, a cell access method is provided. In this method, when an electronic device accesses a first cell, if it measures that the signal quality of the first cell is lower than the signal quality threshold, the fourth strategy is executed. The fourth strategy is: sending a target event to the first cell, and the target event is used to indicate that the signal quality of the heterogeneous system neighboring cell is higher than the signal quality threshold. Afterwards, if the electronic device receives a redirection message sent by the first cell, it accesses a second cell corresponding to the redirection frequency carried by the redirection message, the redirection frequency carried by the redirection message is the frequency of the second cell, and the second cell is a heterogeneous system neighboring cell of the first cell; or, if the electronic device receives a switching command from the first cell, it accesses a second cell indicated by the switching command.

[0036] For example, the target event is a B event, which may be a B1 event or a B2 event.

[0037] It should be noted that when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it should report the A2 event to the first cell. However, in the related art, after the first cell receives the A2 event, it is very likely to instruct the electronic device to redirect to the same system frequency of the first cell. Usually, the failure probability of the electronic device accessing the same system frequency of the first cell is higher than the failure probability of accessing the different system frequency of the first cell. For this reason, when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it does not report the A2 event, but reports the target event to indicate that the signal quality of the neighboring cell of the different system is higher than the signal quality threshold. After the first cell receives the target event, it learns that the signal quality of the neighboring cell of the different system is higher, and then it is very likely to instruct the electronic device to redirect or switch to the neighboring cell of the different system in the future.

[0038] In the present application, when the signal quality of the first cell is low, the electronic device can report the target event to the first cell, so that the first cell instructs the electronic device to redirect or switch to the second cell. Since the second cell is a neighboring cell of a different system of the first cell and the mobile communication technology standard supported by the second cell is lower than the mobile communication technology standard supported by the first cell, the electronic device actually falls back from the first cell to the second cell when redirecting or switching. In this case, the success rate of the electronic device accessing the second cell is higher than that of the electronic device accessing the neighboring cell of the same system of the first cell. This can avoid repeated redirection of electronic devices in a short period of time to a certain extent, and then avoid the problem of service jamming or even interruption to a certain extent.

[0039] Optionally, if the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, the operation of executing the fourth strategy may be: if the signal quality of the first cell is measured to be lower than the signal quality threshold, then if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, execute the fourth strategy.

[0040] Optionally, if the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, the operation of executing the fourth strategy may be: if the signal quality of the first cell is measured to be lower than the signal quality threshold, then if all strategies in the first preset strategy have been executed within the fifth preset time period before the current moment, the fourth strategy is executed, and the first preset strategy includes one or more of the first strategy, the second strategy, and the third strategy.

[0041] In a fifth aspect, a cell access method is provided. In this method, an electronic device receives a redirection message sent by a first cell. The electronic device then accesses a cell corresponding to a redirection frequency carried in the redirection message. If access to the cell corresponding to the redirection frequency fails, if the redirection message is a blind redirection message, a fifth strategy is implemented: accessing a second cell, which is a neighboring cell of a different system than the first cell.

[0042] Since the redirection frequency carried in the blind redirection message is directly specified by the first cell, if the electronic device fails to access the cell corresponding to the redirection frequency carried in the blind redirection message, it is reasonable to suspect that the first cell's neighboring cells in the same system are likely to have this problem. To this end, in this application, if the electronic device fails to access the cell corresponding to the redirection frequency carried in the blind redirection message, it directly accesses the first cell's neighboring cell in a different system, that is, the second cell.

[0043] After the electronic device accesses the second cell, on the one hand, it can, to a certain extent, avoid the problem of repeated redirection due to low cell signal quality. On the other hand, even if redirection is required later, since the redirection frequency indicated by the second cell is likely different from the redirection frequency indicated by the first cell, it can, to a certain extent, avoid the problem of the electronic device failing to access the cell corresponding to the redirection frequency. This can, to a certain extent, prevent the electronic device from repeatedly redirecting in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0044] Optionally, the operation for the electronic device to access the cell corresponding to the redirected frequency carried in the redirection message may be: if the cell identifier of the first cell is not a problem cell identifier and the frequency of the first cell is not a problem frequency, then access the cell corresponding to the redirected frequency; if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, then if the redirection message is a measurement redirection message, then access the cell corresponding to the redirected frequency. Accordingly, after the electronic device receives the redirection message sent by the first cell, if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, then if the redirection message is a blind redirection message, the fifth strategy is executed.

[0045] Because the redirection frequency carried in the measurement redirection message is determined by the first cell based on the relevant cell signal quality reported by the electronic device, the electronic device has a higher success rate in accessing the cell corresponding to the redirection frequency carried in the measurement redirection message. Therefore, if the redirection message is a measurement redirection message, the electronic device can access the cell corresponding to the redirection frequency carried in the redirection message.

[0046] Because the redirection frequency carried in the blind redirection message is directly specified by the first cell, if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, the success rate of the electronic device accessing the cell corresponding to the redirection frequency carried in the blind redirection message is typically relatively low. Therefore, in the present application, if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, and the redirection message is a blind redirection message, the electronic device does not access the cell corresponding to the redirection frequency carried in the redirection message, but instead accesses a second cell. The second cell is a neighboring cell of a different system from the first cell and the mobile communication technology standard supported by the second cell is lower than that supported by the first cell. In this case, the electronic device actually falls back from the first cell to the second cell during redirection. In this case, the electronic device has a higher success rate of accessing the second cell than if the electronic device accessed the cell corresponding to the redirection frequency directly specified by the first cell in the blind redirection message. This can, to a certain extent, prevent the electronic device from being repeatedly redirected in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0047] Optionally, the operation of the electronic device accessing the cell corresponding to the redirection frequency carried by the redirection message can be: if all strategies in the second preset strategy have not been executed within the fifth preset time period before the current moment, then access the cell corresponding to the redirection frequency, and the second preset strategy includes one or more of the first strategy, the second strategy, the third strategy, and the fourth strategy.

[0048] Correspondingly, after the electronic device receives the redirection message sent by the first cell, if all strategies in the second preset strategy have been executed within the fifth preset time period before the current moment, the fifth strategy will be executed if the redirection message is a blind redirection message.

[0049] In a sixth aspect, a cell access method is provided. In this method, when an electronic device accesses a target cell, if the measured signal quality of the target cell is lower than a signal quality threshold, then, if the signal quality of the target cell is lower than a preset signal quality, a fourth number is determined, where the fourth number is the number of failed attempts to access the cell corresponding to the redirection frequency carried in the redirection message within a fourth preset time period before the current moment, and the preset signal quality is a signal quality that can trigger blind redirection; if the fourth number is greater than or equal to the fourth number threshold, a sixth strategy is implemented, which is: not sending an A2 event to the target cell.

[0050] If the signal quality of the target cell is lower than the preset signal quality, if the electronic device reports the A2 event, it is likely to trigger blind redirection of the target cell. If the fourth number is greater than or equal to the fourth number threshold, it means that the electronic device has previously attempted to access the cell corresponding to the redirection frequency carried in the redirection message multiple times but has failed. In this case, if the electronic device reports the A2 event and triggers blind redirection, it is likely that the electronic device will still fail to access the cell corresponding to the redirection frequency carried in the redirection message, which will cause significant service lag or even interruption. Therefore, the electronic device in this application does not report the A2 event in this case to avoid triggering blind redirection, which can avoid the problem of service lag or even interruption to a certain extent. It should be noted that although the current signal quality of the target cell is poor, the electronic device can continue to access the target cell and continue to carry out business. Compared with the problem of the electronic device being unable to access the cell for a period of time due to access failure after blind redirection, which then causes significant service lag or even interruption, it is obviously more conducive to the electronic device to continue to maintain access to the target cell.

[0051] Optionally, if the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, then when the signal quality of the target cell is lower than the preset signal quality, the operation of determining the fourth number may be: if the signal quality of the target cell is measured to be lower than the signal quality threshold, then when the signal quality of the target cell is lower than the preset signal quality, the cell identifier of the target cell is not a problem cell identifier, and the frequency of the target cell is not a problem frequency, the fourth number is determined.

[0052] Accordingly, if the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, the sixth strategy is executed when the signal quality of the target cell is lower than the preset signal quality, and the cell identifier of the target cell is a problem cell identifier and / or the frequency of the target cell is a problem frequency.

[0053] Optionally, if the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, then when the signal quality of the target cell is lower than the preset signal quality, the operation of determining the fourth number of times may be: if the signal quality of the target cell is measured to be lower than the signal quality threshold, then when the signal quality of the target cell is lower than the preset signal quality, and all strategies in the third preset strategy have been executed within the fifth preset time period before the current moment, the fourth number of times is determined, and the third preset strategy includes one or more of the first strategy, the second strategy, the third strategy, the fourth strategy, and the fifth strategy.

[0054] In a seventh aspect, a chip system is provided, which is applied to an electronic device. The chip system includes one or more processors, and the processor is used to call computer instructions to enable the electronic device to execute the above-mentioned cell access method.

[0055] In an eighth aspect, a cell access device is provided, which has the function of implementing the above-mentioned cell access method. The cell access device includes at least one module, and the at least one module is used to implement the above-mentioned cell access method.

[0056] In a ninth aspect, an electronic device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned cell access method when executed by the processor.

[0057] In a tenth aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on the computer, the computer executes the above-mentioned cell access method.

[0058] In an eleventh aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the above-mentioned cell access method.

[0059] The technical effects obtained in the above-mentioned seventh to eleventh aspects are similar to the technical effects obtained by the corresponding technical means in the above-mentioned first to sixth aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] FIG1 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0061] FIG2 is a flowchart of a redirection process provided by an embodiment of the present application;

[0062] FIG3 is a flow chart of a cell access method provided in an embodiment of the present application;

[0063] FIG4 is a schematic diagram of a cell access process provided in an embodiment of the present application;

[0064] FIG5 is a flowchart of another cell access method provided in an embodiment of the present application;

[0065] FIG6 is a flowchart of another cell access method provided in an embodiment of the present application;

[0066] FIG7 is a flowchart of another cell access method provided in an embodiment of the present application;

[0067] FIG8 is a schematic diagram of another communication system provided in an embodiment of the present application;

[0068] FIG9 is a schematic diagram of another cell access process provided in an embodiment of the present application;

[0069] FIG10 is a flowchart of another cell access method provided in an embodiment of the present application;

[0070] FIG11 is a flowchart of another cell access method provided in an embodiment of the present application;

[0071] FIG12 is a flowchart of another cell access method provided in an embodiment of the present application;

[0072] FIG13 is a flowchart of another cell access method provided in an embodiment of the present application;

[0073] FIG14 is a flowchart of another cell access method provided in an embodiment of the present application;

[0074] FIG15 is a flowchart of another cell access method provided in an embodiment of the present application;

[0075] FIG16 is a flowchart of another cell access method provided in an embodiment of the present application;

[0076] FIG17 is a flowchart of another cell access method provided in an embodiment of the present application;

[0077] FIG18 is a flowchart of another cell access method provided in an embodiment of the present application;

[0078] FIG19 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0079] FIG20 is a software structure block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0080] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0081] It should be understood that the “multiple” mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of this application, words such as “first” and “second” are used to distinguish between identical or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and execution order, and words such as “first” and “second” do not necessarily limit them to be different.

[0082] The phrases "one embodiment" or "some embodiments" described in this application mean that the specific features, structures, or characteristics described in that embodiment are included in one or more embodiments of the application. Thus, the phrases "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" that appear in different places in this application do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. In addition, the terms "including," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0083] The following describes the system architecture involved in the embodiments of the present application.

[0084] FIG1 is a schematic diagram of a communication system provided in an embodiment of the present application. Referring to FIG1 , the communication system may include an electronic device 100 , a first cell 200 , and a second cell 300 .

[0085] There may be one or more first cells 200. There may also be one or more second cells 300.

[0086] The electronic device 100 is within the coverage of the first cell 200 and the coverage of the second cell 300. The electronic device 100 can access one first cell 200 or one second cell 300.

[0087] The electronic device 100 may also be referred to as a UE. The electronic device 100 may support multiple mobile communication technology standards, such as the second generation mobile communication technology (2G) standard, the third generation mobile communication technology (3G) standard, the fourth generation mobile communication technology (4G) standard, and the fifth generation mobile communication technology (5G) standard. The 4G standard may also be referred to as the long term evolution (LTE) standard.

[0088] By way of example, the electronic device 100 may be a mobile terminal (MT), a mobile station (MS), a mobile unit (MU), a wireless unit, a remote unit, a user agent, a mobile client, etc. For example, the electronic device 100 may be a mobile phone, a tablet computer, a wearable device, a digital camera, an in-vehicle device, an augmented reality (AR) device, a virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), a laptop computer, etc., and the embodiments of the present application are not limited thereto.

[0089] The second cell 300 is a neighboring cell of a different system of the first cell 200. That is, the mobile communication technology standards supported by the first cell 200 and the second cell 300 are different. In addition, the mobile communication technology standard supported by the first cell 200 is higher than the mobile communication technology standard supported by the second cell 300. For example, the first cell 200 supports the 5G standard. In this case, the first cell 200 can be called a 5G cell; the second cell 300 supports the 4G standard. In this case, the second cell 300 can be called a 4G cell. For another example, the first cell 200 supports the 4G standard. In this case, the first cell 200 can be called a 4G cell; the second cell 300 supports the 3G standard. In this case, the second cell 300 can be called a 3G cell. Optionally, the 5G cell can also be called a new radio (NR) cell. The 4G cell can also be called an LTE cell.

[0090] When the electronic device 100 accesses one of the first cell 200 and the second cell 300, the electronic device 100 can communicate with this cell. When the electronic device 100 communicates with this cell, it means communicating with the base station of this cell. For example, when the electronic device 100 accesses a 3G cell, the electronic device 100 communicates with the base station (node ​​B, NB) of the 3G cell; when the electronic device 100 accesses a 4G cell, the electronic device 100 communicates with the evolved base station (evolutional node B, eNB) of the 4G cell; when the electronic device 100 accesses a 5G cell, the electronic device 100 communicates with the next generation base station (next generation node B, gNB) of the 5G cell.

[0091] It should be noted that in the embodiment of the present application, the electronic device 100 may support a first mobile communication technology standard and a second mobile communication technology standard, where the first mobile communication technology standard is higher than the second mobile communication technology standard. The first mobile communication technology standard is the mobile communication technology standard supported by the first cell 200, and the second mobile communication technology standard is the mobile communication technology standard supported by the second cell 300. In some embodiments, the first mobile communication technology standard may be the highest mobile communication technology standard among the multiple mobile communication technology standards supported by the electronic device 100. In the embodiment of the present application, a network based on the first mobile communication technology standard is referred to as a first network, and a network based on the second mobile communication technology standard is referred to as a second network.

[0092] After the electronic device 100 accesses any one of the first cell 200 and the second cell 300, the cell accessed by the electronic device 100 can be called the serving cell of the electronic device 100. Currently, when the signal quality of the serving cell falls below a threshold, the electronic device 100 can report an A2 event to the serving cell, hoping that the serving cell will issue an instruction for the electronic device 100 to switch to another cell. After receiving the A2 event reported by the electronic device 100, the serving cell can send a redirection message to the electronic device 100. However, when the electronic device 100 receives the redirection message, it is prone to fail to access the cell corresponding to the redirection frequency carried in the redirection message.

[0093] Next, taking the serving cell as a 5G cell as an example, the redirection process of the electronic device is exemplified.

[0094] FIG2 is a flowchart of a redirection process provided by an embodiment of the present application. Referring to FIG2 , the redirection process may include the following steps 201 to 215 .

[0095] Step 201: The electronic device accesses 5G cell A.

[0096] When the electronic device accesses the 5G cell A, the electronic device is in a radio resource control (RRC) connected state. At this time, the electronic device resides in the 5G cell A.

[0097] Step 202: 5G cell A sends a measurement configuration message to the electronic device.

[0098] For example, the measurement configuration message may be an RRC connection reconfiguration message carrying a measurement configuration (measConfig) information element.

[0099] The measurement configuration message is used to instruct the electronic device to measure the signal quality of the serving cell, where the serving cell is 5G cell A. For example, the measurement configuration message may include A2 event information. The A2 event information may include a threshold value for the A2 event. The A2 event is used to indicate that the signal quality of the serving cell is below the threshold value.

[0100] After the electronic device receives the measurement configuration message sent by 5G cell A, it can measure the signal quality of 5G cell A.

[0101] Step 203: The electronic device transmits service data through 5G cell A.

[0102] Step 204: The electronic device measures that the signal quality of 5G cell A is lower than the threshold and reports an A2 event.

[0103] For example, when the electronic device measures that the signal quality of 5G cell A is lower than the threshold value, it can send a measurement report (MR) message containing an A2 event to 5G cell A.

[0104] Step 205: 5G cell A sends a redirection message to the electronic device.

[0105] For example, the redirection message may be an RRC connection release message carrying a redirected frequency (redirectedCarrierInfo) information element. The redirected frequency information element may include the redirected frequency.

[0106] Step 206: The electronic device attempts to access the cell corresponding to the redirection frequency carried in the redirection message, but fails to access and resides back in 5G cell A.

[0107] After receiving the redirection message, the electronic device releases the RRC connection with 5G cell A. After the RRC connection is released, the electronic device enters the RRC idle state. After that, the electronic device searches for the cell corresponding to the redirection frequency and attempts to access it. In some cases, the electronic device may fail to access the cell because it cannot search for the cell corresponding to the redirection frequency. Of course, the electronic device may also fail to access the cell due to other factors, which is not limited in this embodiment of the present application.

[0108] If the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device will most likely reside back in the source cell, that is, reside back in 5G cell A.

[0109] Step 207: The electronic device initiates a service request process to trigger a random access process.

[0110] In some embodiments, when the electronic device is in the RRC idle state, if there is user data or signaling message to be sent, a service request process can be initiated. In order to implement the service request, the electronic device needs to access the cell, which triggers the random access process. In the embodiment of the present application, the random access process refers to the electronic device using a random access method (including but not limited to a contention random access method) to access 5G cell A.

[0111] For example, the random access process may include the following steps 208 to 212:

[0112] Step 208: The electronic device sends a random access preamble to 5G cell A.

[0113] For example, the electronic device may carry the random access prefix in the MSG1 message and send it to 5G cell A.

[0114] Step 209: After receiving the random access prefix, 5G cell A sends a random access response message to the electronic device.

[0115] For example, the random access response message may also be called a MSG2 message.

[0116] Step 210: After receiving the random access response message, the electronic device sends an RRC connection request message to 5G cell A.

[0117] For example, the RRC connection request message may also be referred to as a MSG3 message.

[0118] Step 211: After receiving the RRC connection request message, 5G cell A sends an RRC connection setup message to the electronic device.

[0119] For example, the RRC connection establishment message may also be referred to as a MSG4 message.

[0120] Step 212: After receiving the RRC connection establishment message, the electronic device sends an RRC connection setup complete message to 5G cell A.

[0121] For example, the RRC connection establishment complete message includes a service request message of a non-access stratum (NAS) layer.

[0122] Step 213: After receiving the RRC connection establishment completion message, 5G cell A sends a NAS layer service accept message to the electronic device.

[0123] In some embodiments, after receiving the service request message, 5G cell A may send the service request message to the core network. After receiving the service request message, the core network performs relevant processing and then sends a service acceptance message to the electronic device through 5G cell A.

[0124] After the electronic device receives the service acceptance message, it can transmit service data through 5G cell A.

[0125] However, due to the relatively low signal quality of 5G cell A, steps 204 to 207 will be repeated. Specifically, the electronic device will still report the A2 event when the signal quality of 5G cell A falls below the threshold. 5G cell A then sends a redirection message to the electronic device. The electronic device will likely fail again when accessing the cell corresponding to the redirection frequency carried in the redirection message and will return to 5G cell A. The electronic device will then initiate a service request process, triggering the random access process. Afterwards, the above process will be repeated due to the relatively low signal quality of 5G cell A, and redirection will be repeated.

[0126] Generally speaking, after an electronic device repeatedly initiates a service request process multiple times in a short period of time, the electronic device sends a service request message to 5G cell A during the random access process. Then the core network will return a service reject message to the electronic device through 5G cell A.

[0127] Step 214: 5G cell A sends a service rejection message to the electronic device.

[0128] For example, the rejection reason value carried in the service rejection message may be #10 (implicitly detached).

[0129] Step 215: After receiving the service rejection message, the electronic device initiates initial registration.

[0130] As can be seen from the embodiment of Figure 2 above, the main problem with the above process is that in step 206, the electronic device attempts to access the cell corresponding to the redirection frequency carried in the redirection message, but fails to do so. This failure can cause noticeable service interruption and can cause subsequent repeated redirection of the electronic device, resulting in continued service interruption. Furthermore, repeated redirection of the electronic device can lead to repeated initiation of service request processes, which in turn causes the core network to send a service rejection message to the electronic device, which can cause service interruption, such as a dropped call during a call.

[0131] To this end, an embodiment of the present application provides a cell access method to solve the above-mentioned problem, so as to avoid service freeze or even interruption to a certain extent.

[0132] The cell access method provided in the embodiment of the present application is explained in detail below.

[0133] FIG3 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG3 , the method includes the following steps:

[0134] Step 301: The electronic device accesses a target cell.

[0135] The target cell may be the first cell or the second cell. The first cell and the second cell have been explained in detail in the embodiment of FIG1 above, and will not be described in detail in this embodiment of the application.

[0136] When an electronic device accesses a target cell, the electronic device is in an RRC connected state. At this time, the electronic device resides in the target cell. The target cell is the current serving cell of the electronic device.

[0137] It should be noted that after an electronic device accesses a target cell, it can transmit service data through the target cell. For example, after an electronic device accesses a target cell, it can make a call, and during the call, it can transmit call data through the target cell. Alternatively, after an electronic device accesses a target cell, it can browse the web, and during the web browsing process, it can transmit web data through the target cell.

[0138] Step 302: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0139] After an electronic device accesses a target cell, the target cell may send a measurement configuration message to the electronic device, instructing the electronic device to measure the signal quality of the serving cell. Upon receiving the measurement configuration message, the electronic device may measure the signal quality of the target cell and report an A2 event to the target cell if the target cell's signal quality falls below a signal quality threshold. For example, the electronic device may send a measurement report message containing an A2 event to the target cell.

[0140] For example, the measurement configuration message may be an RRC connection reconfiguration message carrying a measurement configuration information element. The measurement configuration information element may include A2 event information. The A2 event information may include a threshold value for the A2 event. The A2 event is used to indicate that the signal quality of the serving cell is lower than the threshold value.

[0141] The signal quality threshold may be pre-set. Optionally, the signal quality threshold may be a threshold value of the A2 event included in the measurement configuration message.

[0142] The signal quality of a cell can be characterized by one or more characteristics of the cell signal. For example, the signal quality of a cell can be the reference signal receiving power (RSRP) of the cell, or the reference signal received quality (RSRQ) of the cell, or the signal to interference plus noise ratio (SINR) of the cell, or the received signal strength indication (RSSI) of the cell. Of course, the signal quality of a cell can also be jointly characterized by two or more of the RSRP, RSRQ, SINR, and RSSI of the cell, which is not limited in the embodiments of the present application.

[0143] Step 303: The target cell sends a redirection message to the electronic device.

[0144] For example, the redirection message may be an RRC connection release message carrying a redirection frequency information element. The redirection frequency information element may include a redirection frequency.

[0145] Optionally, the redirection frequency may be a frequency of the same system as the target cell, or may be a frequency of a different system than the target cell. For example, if the target cell is a 5G cell, the redirection frequency may be a 5G frequency or a 4G frequency.

[0146] It should be noted that redirection is generally divided into blind redirection and measured redirection.

[0147] In some embodiments, after receiving the A2 event sent by the electronic device, the target cell can directly specify a redirection frequency and then directly send a redirection message carrying the redirection frequency to the electronic device, instructing the electronic device to switch to the cell corresponding to the redirection frequency. This redirection process is a blind redirection process.

[0148] In other embodiments, after receiving an A2 event sent by an electronic device, the target cell first sends a measurement configuration message to the electronic device, instructing the electronic device to measure and report the cell signal quality corresponding to the relevant frequency. After receiving the cell signal quality reported by the electronic device, the target cell determines a redirection frequency based on the received signal quality, and then sends a redirection message carrying the redirection frequency to the electronic device, instructing the electronic device to switch to the cell corresponding to the redirection frequency. This redirection process is a measurement redirection process.

[0149] Step 304: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0150] After receiving the redirection message, the electronic device releases the RRC connection with the target cell and enters the RRC idle state after the RRC connection is released. After that, the electronic device searches for the cell corresponding to the redirection frequency and attempts to access it.

[0151] In some embodiments, if the electronic device fails to search for a cell corresponding to the redirection frequency, it can be determined that access to the cell corresponding to the redirection frequency has failed. In blind redirection, the target cell directly specifies a redirection frequency. In this case, there may not be a cell corresponding to the redirection frequency nearby, resulting in the electronic device failing to access the cell corresponding to the redirection frequency.

[0152] Of course, the electronic device may also fail to access the cell corresponding to the redirected frequency due to other factors, and this embodiment of the present application does not limit this.

[0153] Step 305: If the electronic device fails to access the cell corresponding to the redirected frequency, a first number is determined, and a first strategy is executed when the first number is greater than or equal to a first number threshold. The first strategy is: access a cell other than the target cell.

[0154] The first count is the number of failed attempts to access the cell corresponding to the redirection frequency indicated by the target cell within a first preset duration before the current moment. The first preset duration can be pre-set. For example, the first preset duration can be 2 seconds, 3 seconds, etc., and this embodiment of the present application does not limit this.

[0155] It should be noted that the "first number" described in the embodiments of the present application is determined based on the redirection message and is used to indicate the number of redirection failures. That is, after the target cell sends a redirection message to the electronic device, if the electronic device fails to successfully access the cell corresponding to the redirection frequency carried in the redirection message, the electronic device determines that a redirection failure has occurred, which can be counted towards the first number corresponding to the target cell. In other words, even if the electronic device searches for multiple cells corresponding to the redirection frequency carried in the redirection message, but fails to access all of these cells, the electronic device still determines that a redirection failure has occurred.

[0156] The first number threshold can be pre-set. For example, the first number threshold can be 2, 3, etc., which is not limited in the embodiment of the present application.

[0157] In some embodiments, after the electronic device determines the first number, if the first number is less than the first number threshold, the electronic device accesses a cell. In this case, the electronic device can perform a cell search, select a suitable cell from the searched cells, and then access it. The cell accessed may or may not be the target cell.

[0158] If the first number is greater than or equal to the first number threshold, it means that the electronic device has tried to access the cell corresponding to the redirected frequency indicated by the target cell many times in a short period of time but failed. In this case, it is reasonable to suspect that this problem is likely caused by the target cell. To this end, in an embodiment of the present application, after the electronic device fails to access the cell corresponding to the redirected frequency, it will be banned from returning to the target cell if the first number is greater than or equal to the first number threshold, that is, it will access a cell other than the target cell. This cell can be a neighboring cell of the same system as the target cell, or a neighboring cell of a different system than the target cell. For example, if the target cell is a 5G cell, then this cell can be a 5G cell or a 4G cell.

[0159] For example, after the electronic device fails to access the cell corresponding to the redirected frequency, if the first number of times is greater than or equal to the first number threshold, the target cell will be disabled during the cell selection process or the cell reselection process, and a cell other than the target cell will be selected for residency and access.

[0160] After an electronic device accesses a cell other than the target cell, it can, on the one hand, avoid the problem of repeated redirection due to low cell signal quality. On the other hand, even if redirection is required later, the redirection frequency indicated by the cell other than the target cell is likely different from the redirection frequency indicated by the target cell, thus avoiding the problem of the electronic device failing to access the cell corresponding to the redirection frequency. This can, to a certain extent, prevent electronic devices from being repeatedly redirected in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0161] In some embodiments, the electronic device may access a cell other than the target cell using a random access method (including but not limited to a contention-based random access method) in step 305. A possible implementation method for the electronic device to access the cell is now described with reference to FIG4.

[0162] FIG4 is a schematic diagram of a cell access process provided by an embodiment of the present application. Referring to FIG4 , the cell access process may include the following steps 401 to 408 .

[0163] Step 401: The electronic device camps on a cell other than the target cell.

[0164] After performing cell search, if the electronic device finds a cell other than the target cell and determines to access the cell, the electronic device may camp on the cell first and then access the cell.

[0165] Step 402: The electronic device initiates a service request process, triggering a random access process.

[0166] In some embodiments, when the electronic device is in the RRC idle state, if there is user data or signaling message to be sent, a service request process may be initiated. In order to implement the service request, the electronic device needs to access the cell, thus triggering a random access process.

[0167] For example, the random access process may include the following steps 403 to 408:

[0168] Step 403: The electronic device sends a random access prefix to the cell.

[0169] For example, the electronic device may carry the random access prefix in a MSG1 message and send it to the cell.

[0170] Step 404: After receiving the random access prefix, the cell sends a random access response message to the electronic device.

[0171] For example, the random access response message may also be called a MSG2 message.

[0172] Step 405: After receiving the random access response message, the electronic device sends an RRC connection request message to the cell.

[0173] For example, the RRC connection request message may also be referred to as a MSG3 message.

[0174] Step 406: After receiving the RRC connection request message, the cell sends an RRC connection establishment message to the electronic device.

[0175] For example, the RRC connection establishment message may also be referred to as a MSG4 message.

[0176] Step 407: After receiving the RRC connection establishment message, the electronic device sends an RRC connection establishment completion message to the cell.

[0177] For example, the RRC connection establishment complete message includes a service request message of the NAS layer.

[0178] Step 408: After receiving the RRC connection establishment completion message, the cell sends a NAS layer service acceptance message to the electronic device.

[0179] In some embodiments, after receiving the service request message, the cell may send the service request message to the core network. After receiving the service request message, the core network performs relevant processing and then sends a service acceptance message to the electronic device through the cell.

[0180] After receiving the service acceptance message, the electronic device can transmit service data through this cell.

[0181] It should be noted that the embodiment of the present application only uses the embodiment of Figure 4 above as an example to illustrate the process of an electronic device accessing a cell other than the target cell, and the embodiment of Figure 4 above does not limit the embodiment of the present application. The electronic device can also access a cell other than the target cell in other ways different from the embodiment of Figure 4 above, and the embodiment of the present application does not limit this.

[0182] In some embodiments, after the electronic device determines the first number, if the first number is greater than or equal to the first number threshold, the cell identifier of the target cell (including but not limited to the physical cell identifier (PCI), etc.) can also be recorded as the problem cell identifier. The electronic device can record one or more problem cell identifiers. The electronic device will try not to select the cell identified by the problem cell identifier in the cell selection process and the cell reselection process, and will try not to report the cell identified by the problem cell identifier when measuring the cell, so as to avoid accessing the cell identified by the problem cell identifier as much as possible.

[0183] In some cases, the electronic device may still access the cell identified by the problem cell identifier. For example, assuming that the current serving cell of the electronic device is the target cell, the target cell may be the cell identified by the problem cell identifier previously recorded by the electronic device.

[0184] In this case, after the target cell sends a redirection message to the electronic device, in step 305, if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, the electronic device can determine the first number when it determines that the cell identifier of the target cell is not the recorded problem cell identifier, and then execute the first strategy when the first number is greater than or equal to the first number threshold to access cells other than the target cell; and when the electronic device determines that the cell identifier of the target cell is the recorded problem cell identifier, there is no need to determine the first number, and the first strategy can be directly executed to access cells other than the target cell.

[0185] In an embodiment of the present application, after an electronic device receives a redirection message sent by a target cell, if access to the cell corresponding to the redirection frequency carried in the redirection message fails, a first number can be determined, where the first number is the number of failures to access the cell corresponding to the redirection frequency indicated by the target cell within a first preset time period before the current moment. If the first number is greater than or equal to the first number threshold, it means that the electronic device has repeatedly attempted to access the cell corresponding to the redirection frequency indicated by the target cell within a short period of time and failed. In this case, the electronic device accesses a cell other than the target cell. In this way, subsequent redirection can be avoided to a certain extent, and even if subsequent redirection occurs, the problem of the electronic device failing to access the cell corresponding to the redirection frequency can be avoided to a certain extent. In this way, repeated redirection of the electronic device in a short period of time can be avoided to a certain extent, and the problem of service jamming or even interruption can be avoided to a certain extent.

[0186] FIG5 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG5 , the method includes the following steps:

[0187] Step 501: The electronic device accesses the target cell.

[0188] The operation of step 501 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0189] Step 502: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0190] The operation of step 502 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0191] Step 503: The target cell sends a redirection message to the electronic device.

[0192] The operation of step 503 is similar to the operation of step 303 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0193] Step 504: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0194] The operation of step 504 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0195] Step 505: If the electronic device fails to access the cell corresponding to the redirected frequency, a second number is determined, and a second strategy is executed when the second number is greater than or equal to the second number threshold. The second strategy is: access a cell corresponding to a frequency other than the target frequency, where the target frequency is the frequency of the target cell.

[0196] The second number is the number of failed attempts to access the cell corresponding to the redirected frequency indicated by the cell corresponding to the target frequency within a second preset time period before the current moment. The second preset time period can be pre-set. For example, the second preset time period can be 2 seconds, 3 seconds, 4 seconds, etc., which is not limited in this embodiment of the present application.

[0197] It should be noted that the "second number" described in the embodiments of the present application is determined based on the redirection message and is used to indicate the number of redirection failures. That is, after a cell corresponding to the target frequency sends a redirection message to an electronic device, if the electronic device fails to successfully access the cell corresponding to the redirection frequency carried in the redirection message, the electronic device determines that a redirection failure has occurred, which can be counted towards the second number corresponding to the target frequency. In other words, even if the electronic device searches for multiple cells corresponding to the redirection frequency carried in the redirection message, but fails to access all of the multiple cells, the electronic device still determines that a redirection failure has occurred.

[0198] The second number threshold can be pre-set. For example, the second number threshold can be 2, 3, 4, etc., which is not limited in the embodiment of the present application.

[0199] In some embodiments, after the electronic device determines the second number, if the second number is less than the second number threshold, the electronic device accesses a cell. In this case, the electronic device can perform a cell search, select a suitable cell from the searched cells, and then access it. The accessed cell may or may not correspond to the target frequency.

[0200] If the second number is greater than or equal to the second number threshold, it means that the electronic device has tried to access the cell corresponding to the redirected frequency indicated by the cell corresponding to the target frequency multiple times in a short period of time and failed. In this case, it is reasonable to suspect that the cells corresponding to the target frequency are likely to have this problem. For this reason, in an embodiment of the present application, after the electronic device fails to access the cell corresponding to the redirected frequency, it will be banned back to the target frequency if the second number is greater than or equal to the second number threshold, that is, it will access a cell corresponding to a frequency other than the target frequency. This cell can be a neighboring cell of the same system as the target cell, or a neighboring cell of a different system than the target cell. For example, if the target cell is a 5G cell, then this cell can be a 5G cell or a 4G cell.

[0201] For example, after the electronic device fails to access the cell corresponding to the redirected frequency, if the second number is greater than or equal to the second number threshold, the target frequency will be disabled during the cell selection process or the cell reselection process, and a cell corresponding to a frequency other than the target frequency will be selected to reside in and access.

[0202] After an electronic device accesses a cell corresponding to a frequency other than the target frequency, it can, to a certain extent, avoid the problem of repeated redirection due to low cell signal quality. Furthermore, even if redirection is required later, the redirection frequency indicated by the cell corresponding to the frequency other than the target frequency is likely different from the redirection frequency indicated by the cell corresponding to the target frequency. This can, to a certain extent, prevent the electronic device from failing to access the cell corresponding to the redirection frequency. This can, to a certain extent, prevent the electronic device from repeatedly redirecting in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0203] In some embodiments, in step 505, the electronic device may use a random access method (including but not limited to a contention-based random access method) to access a cell corresponding to a frequency other than the target frequency. Optionally, a possible implementation method for the electronic device to access this cell can refer to the method described in the embodiment of FIG. 4 above, which will not be described in detail in this embodiment of the present application.

[0204] In some embodiments, in step 505, if the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device may further determine whether the cell identifier of the target cell is a problem cell identifier. If the cell identifier of the target cell is not a problem cell identifier, the electronic device may determine a second number and, if the second number is greater than or equal to a second number threshold, execute a second strategy to access a cell corresponding to a frequency other than the target frequency. If the cell identifier of the target cell is a problem cell identifier, the electronic device does not need to determine the second number and may directly execute the second strategy to access a cell corresponding to a frequency other than the target frequency.

[0205] In some embodiments, after the electronic device determines the second number, if the second number is greater than or equal to a second number threshold, the target frequency may be recorded as a problem frequency. The electronic device may record one or more problem frequencies. The electronic device will try not to select cells corresponding to problem frequencies during cell selection and cell reselection processes, and will also try not to report cells corresponding to problem frequencies during cell monitoring, thereby minimizing access to cells corresponding to problem frequencies.

[0206] In some cases, the electronic device may still access the cell corresponding to the problematic frequency. For example, if the electronic device's current serving cell is the target cell, the target cell may be the cell corresponding to the problematic frequency previously recorded by the electronic device.

[0207] In this case, after the target cell sends a redirection message to the electronic device, in step 505, if the electronic device fails to access the cell corresponding to the redirection frequency carried in the redirection message, the electronic device can determine the second number when it determines that the frequency of the target cell (i.e., the target frequency) is not the recorded problem frequency, and then execute the second strategy when the second number is greater than or equal to the second number threshold to access a cell corresponding to a frequency other than the target frequency; and when the electronic device determines that the target frequency is the recorded problem frequency, there is no need to determine the second number, and the second strategy can be directly executed to access a cell corresponding to a frequency other than the target frequency.

[0208] In an embodiment of the present application, after an electronic device receives a redirection message sent by a target cell, if it fails to access the cell corresponding to the redirection frequency carried in the redirection message, a second number can be determined. The second number is the number of failed attempts to access the cell corresponding to the redirection frequency indicated by the cell corresponding to the target frequency within a second preset time period before the current moment, where the target frequency is the frequency of the target cell. If the second number is greater than or equal to the second number threshold, it indicates that the electronic device has repeatedly attempted to access the cell corresponding to the redirection frequency indicated by the cell corresponding to the target frequency within a short period of time and failed. In this case, the electronic device accesses a cell corresponding to a frequency other than the target frequency. This can prevent subsequent redirections to a certain extent, and even if a subsequent redirection occurs, it can also prevent the electronic device from failing to access the cell corresponding to the redirection frequency to a certain extent. This can prevent the electronic device from being repeatedly redirected within a short period of time, and thus can prevent service lag or even interruption to a certain extent.

[0209] FIG6 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG6 , the method includes the following steps:

[0210] Step 601: The electronic device accesses the target cell.

[0211] The operation of step 601 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0212] Step 602: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0213] The operation of step 602 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0214] Step 603: The target cell sends a redirection message to the electronic device.

[0215] The operation of step 603 is similar to the operation of step 303 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0216] Step 604: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0217] The operation of step 604 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0218] Step 605: If the electronic device fails to access the cell corresponding to the redirected frequency, the third number is determined, and the third strategy is executed when the third number is greater than or equal to the third number threshold. The third strategy is: access a cell, and after accessing the cell, send target information to the cell. The target information is used to indicate that the electronic device does not support the specified frequency band, and the specified frequency band is the frequency band where the redirected frequency is located.

[0219] The third number is the number of failed attempts to access the cell corresponding to the redirected frequency within a third preset time period before the current moment. The third preset time period can be pre-set. For example, the third preset time period can be 1 day, 2 days, 1 month, 2 months, etc., and is not limited in this embodiment of the present application.

[0220] It should be noted that the "third number" described in the embodiments of the present application is determined based on the redirection message and is used to indicate the number of redirection failures. That is, after a cell sends a redirection message to an electronic device, if the electronic device fails to successfully access the cell corresponding to a redirection frequency carried in the redirection message, the electronic device determines that a redirection failure has occurred, and the third number corresponding to the redirection frequency can be counted. In other words, even if the electronic device searches for multiple cells corresponding to the redirection frequency carried in the redirection message, but fails to access all of the multiple cells, the electronic device still determines that a redirection failure has occurred.

[0221] The third number threshold can be pre-set. For example, the third number threshold can be 2, 3, 4, 5, 6, etc., which is not limited in the embodiment of the present application.

[0222] In some embodiments, after the electronic device determines the third number, if the third number is less than the third number threshold, the electronic device accesses a cell. In this case, the electronic device can perform a cell search and select a suitable cell to camp on and access.

[0223] If the third number is greater than or equal to the third number threshold, it means that the electronic device has previously tried to access the cell corresponding to the redirected frequency point many times but failed. In this case, it is reasonable to suspect that there is a problem with the frequency band (i.e., the designated frequency band) where the redirected frequency point is located. To this end, in an embodiment of the present application, after the electronic device fails to access the cell corresponding to the redirected frequency point, if the third number is greater than or equal to the third number threshold, it can first access a cell, and then send target information to this cell after accessing this cell. Since the target information indicates that the electronic device does not support the designated frequency band, the cell can know that the electronic device does not support the designated frequency band after receiving the target information. Then, when redirection is required later, the redirected frequency point indicated by this cell is likely not to be a frequency point within the designated frequency band, and thus the problem of failure of the electronic device to access the cell corresponding to the redirected frequency point can be avoided to a certain extent. In this way, repeated redirection of electronic devices in a short period of time can be avoided to a certain extent, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0224] It should be noted that in the embodiment of the present application, although the electronic device sends target information to the cell to indicate that it does not support the specified frequency band, this is to prevent the cell from subsequently redirecting the electronic device to the specified frequency band and does not mean that the electronic device actually does not support the specified frequency band. In other words, even if the electronic device supports the specified frequency band, the target information will still be sent to the cell in the above situation to make the cell believe that the electronic device does not support the specified frequency band.

[0225] For example, after the electronic device fails to access the cell corresponding to the redirected frequency, it can perform a cell search if the third number is greater than or equal to the third number threshold, and then select a suitable cell from the searched cells to reside and access, and after accessing, it can send target information to this cell.

[0226] It should be noted that the cell accessed by the electronic device may be a target cell or may not be a target cell, and this embodiment of the present application does not limit this.

[0227] In some embodiments, the electronic device may access the cell using a random access method (including but not limited to a contention-based random access method) in step 605. Optionally, a possible implementation method for the electronic device to access the cell may refer to the method described in the embodiment of FIG. 4 above, which will not be described in detail in this embodiment of the present application.

[0228] In some embodiments, the target information may be UE capability information. In this case, the operation of sending the target information to the cell after the electronic device accesses the cell may be as follows: after accessing the cell, the electronic device first sends a mobility registration updating (MRU) message to the cell to indicate that the UE capability information needs to be updated; after the cell receives the MRU message, the electronic device sends a UE capability enquiry message to the electronic device; after receiving the UE capability enquiry message, the electronic device sends UE capability information to the cell, where the UE capability information is used to indicate that the electronic device does not support the specified frequency band.

[0229] In the embodiment of the present application, the electronic device can actively trigger the MRU process after accessing the cell, so that the cell queries the UE capability information. In this way, the electronic device can report the UE capability information to the cell to indicate that it does not support the specified frequency band.

[0230] Of course, after the electronic device accesses the cell, it can also send target information to the cell in other ways, and the embodiments of the present application do not limit this.

[0231] In some embodiments, in step 605, if the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device may further determine whether the cell identifier of the target cell is a problem cell identifier and whether the frequency of the target cell is a problem frequency. If the cell identifier of the target cell is not a problem cell identifier and the frequency of the target cell is not a problem frequency, the electronic device may determine a third number and execute the third strategy if the third number is greater than or equal to the third number threshold. If the cell identifier of the target cell is a problem cell identifier and / or the frequency of the target cell is a problem frequency, the electronic device does not need to determine the third number and may directly execute the third strategy.

[0232] In an embodiment of the present application, after the electronic device receives a redirection message sent by the target cell, if access to the cell corresponding to the redirection frequency carried in the redirection message fails, a third number can be determined, which is the number of times access to the cell corresponding to the redirection frequency has failed within a third preset time period before the current moment. If the third number is greater than or equal to the third number threshold, it means that the electronic device has previously attempted to access the cell corresponding to the redirection frequency multiple times but has failed. In this case, the electronic device first accesses a cell, and then sends target information to the cell after accessing the cell to indicate that the electronic device does not support the specified frequency band where the redirection frequency is located. In this way, even if a redirection occurs later, the problem of the electronic device failing to access the cell corresponding to the redirection frequency can be avoided to a certain extent. This can avoid repeated redirection of the electronic device in a short period of time to a certain extent, and then can avoid the problem of service jamming or even interruption to a certain extent.

[0233] FIG7 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG7 , the method includes the following steps:

[0234] Step 701: An electronic device accesses a first cell.

[0235] The operation of step 701 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0236] Step 702: The electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, and executes the fourth strategy, which is: sending a target event to the first cell, where the target event is used to indicate that the signal quality of the heterogeneous system neighboring cell is higher than the signal quality threshold.

[0237] For example, the target event may be a B event, such as a B1 event or a B2 event. The B1 event is used to indicate that the signal quality of a neighboring cell of a different system is greater than a threshold. The B2 event is used to indicate that the signal quality of the serving cell is less than threshold 1, while the signal quality of a neighboring cell of a different system is greater than threshold 2. Threshold 1 and threshold 2 may be the same or different. Optionally, the thresholds in the B1 and B2 events may be configured on the network side (including the access network and the core network).

[0238] The signal quality threshold may be pre-set. For example, the signal quality threshold may be a threshold value of an A2 event.

[0239] It should be noted that when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it should report the A2 event to the first cell. However, in the related art, after the first cell receives the A2 event, it is very likely to instruct the electronic device to redirect to the same system frequency of the first cell. Usually, the failure probability of the electronic device accessing the same system frequency of the first cell is higher than the failure probability of accessing the different system frequency of the first cell. For this reason, when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it does not report the A2 event, but reports the target event to indicate that the signal quality of the neighboring cell of the different system is higher than the signal quality threshold. After the first cell receives the target event, it learns that the signal quality of the neighboring cell of the different system is higher, and then it is very likely to instruct the electronic device to redirect or switch to the neighboring cell of the different system in the future.

[0240] It is understandable that in the embodiment of the present application, the triggering of the target event has the following two situations:

[0241] The first scenario is to trigger the target event normally based on the signal quality of the heterogeneous neighboring cell and its threshold. That is, when the electronic device measures the signal quality of the heterogeneous neighboring cell to be higher than the threshold, the B1 event is normally triggered and reported to the serving cell. Alternatively, when the electronic device measures the signal quality of the serving cell to be lower than Threshold 1 and the signal quality of the heterogeneous neighboring cell to be higher than Threshold 2, the electronic device normally triggers the B2 event and reports the B2 event to the serving cell.

[0242] The second scenario is to trigger the target event in the manner of step 702. That is, if the electronic device measures that the signal quality of the serving cell is lower than the signal quality threshold, the electronic device directly triggers the B1 event or the B2 event, regardless of the relationship between the signal quality of the current heterogeneous system neighboring cell and the signal quality threshold, and reports the B1 event or the B2 event to the serving cell.

[0243] In some embodiments, in step 702, when the electronic device measures that the signal quality of the first cell is below a signal quality threshold, it may also determine whether the cell identifier of the first cell is a problem cell identifier and whether the frequency of the first cell is a problem frequency. If the cell identifier of the first cell is not a problem cell identifier and the frequency of the first cell is not a problem frequency, the electronic device may send an A2 event to the first cell. If the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, the electronic device may implement a fourth strategy to send a target event to the first cell.

[0244] Step 703: The first cell sends a redirection message or a handover command to the electronic device.

[0245] The redirection message is used to indicate redirection to a cell corresponding to a redirection frequency. The redirection frequency carried in the redirection message is a frequency of a second cell, and the second cell is a neighboring cell of a different system of the first cell.

[0246] For example, the redirection message may be an RRC connection release message carrying a redirection frequency information element. The redirection frequency information element includes a frequency of a different system of the first cell, that is, a frequency of the second cell. For example, if the first cell is a 5G cell, the redirection frequency may be a 4G frequency.

[0247] It should be noted that redirection is generally divided into blind redirection and measured redirection.

[0248] In some embodiments, after receiving the target event sent by the electronic device, the first cell can directly designate a frequency of a different system as the redirection frequency, and then directly send a redirection message carrying the redirection frequency to the electronic device, instructing the electronic device to switch to the cell corresponding to the redirection frequency. This redirection process is a blind redirection process.

[0249] In other embodiments, after receiving a target event sent by an electronic device, the first cell first sends a measurement configuration message to the electronic device, instructing the electronic device to measure and report the cell signal quality corresponding to the relevant heterogeneous system frequency. After receiving the cell signal quality reported by the electronic device, the first cell determines a heterogeneous system frequency as a redirection frequency based on the received signal quality, and then sends a redirection message carrying the redirection frequency to the electronic device, instructing the electronic device to switch to the cell corresponding to the redirection frequency. This redirection process is a measurement redirection process.

[0250] The handover command is used to instruct handover to a second cell. For example, if the first cell is a 5G cell, the handover command may instruct handover to a 4G cell.

[0251] For example, the handover command may be an RRC connection reconfiguration message carrying a mobility control (mobilityControlInfo) information element.

[0252] Optionally, the handover command may include radio parameters required to be used when handing over to the second cell, such as PCI and radio bearer (RB) configuration information of the second cell to be handed over.

[0253] The RB configuration information is configuration information related to the RB. For example, the RB configuration information may include configuration information related to signaling radio bearer (SRB) 1, SRB2, and data radio bearer (DRB).

[0254] The SRB is the actual transmission channel for signaling messages. SRB1 is used to carry RRC messages and can also carry some NAS messages. SRB2 is used to carry NAS messages. The DRB is the actual transmission channel for user data.

[0255] Step 704: If the electronic device receives the redirection message, it accesses a second cell corresponding to the redirection frequency carried in the redirection message; if the electronic device receives the handover command, it accesses a second cell indicated by the handover command.

[0256] Optionally, after receiving the redirection message, the electronic device releases the RRC connection with the first cell. After the RRC connection is released, the electronic device enters the RRC idle state. Thereafter, the electronic device searches for a second cell corresponding to the redirection frequency point, selects a second cell from the searched second cells, and resides in and accesses the second cell.

[0257] Optionally, after receiving the handover command, the electronic device may camp on and access a second cell according to the wireless parameters included in the handover command.

[0258] In an embodiment of the present application, the electronic device can report a target event to the first cell when the signal quality of the first cell is low, so that the first cell instructs the electronic device to redirect or switch to the second cell. Since the second cell is a neighboring cell of a different system of the first cell and the mobile communication technology standard supported by the second cell is lower than the mobile communication technology standard supported by the first cell, the electronic device actually falls back from the first cell to the second cell when redirecting or switching. In this case, the success rate of the electronic device accessing the second cell is higher than that of the electronic device accessing the neighboring cell of the same system of the first cell. In this way, repeated redirection of the electronic device in a short period of time can be avoided to a certain extent, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0259] In some embodiments, when the electronic device accesses a second cell corresponding to the redirection frequency carried in the redirection message, the electronic device may access the second cell using a random access method (including but not limited to a contention-based random access method). Optionally, a possible implementation method for the electronic device to access the second cell can refer to the method described in the embodiment of FIG. 4 above, which will not be further described in this embodiment of the present application.

[0260] In some embodiments, when the electronic device accesses a second cell indicated by the handover command, it may access the second cell using a random access method (including but not limited to a non-contention random access method) based on the radio parameters included in the handover command. Next, a possible implementation method for the electronic device to access the second cell is exemplified with reference to FIG8 and FIG9.

[0261] As an example, as shown in Figure 8, the communication system in the embodiment of the present application may include an electronic device, an access network, and a core network. The electronic device communicates with the access network, and the access network communicates with the core network.

[0262] The access network is responsible for connecting end users to the core network, using wired or wireless connections and communication technologies. The access network is the edge of the network, the part closest to users and is often called the "last mile."

[0263] For example, the access network of a 5G network includes a 5G cell, and the base station of the 5G cell (i.e., gNB) can be referred to as the access network device in the 5G network. For example, the access network of a 4G network includes a 4G cell, and the base station of the 4G cell (i.e., eNB) can be referred to as the access network device in the 4G network.

[0264] The core network's primary functions are to provide user connections, manage users, and carry services. As a bearer network, it provides an interface to external networks. Establishing user connections includes functions such as mobility management (MM), call management (CM), switching / routing, and recording notifications (combined with intelligent network services to establish connections to intelligent network peripheral devices).

[0265] For example, the core network of a 5G network is the 5G Core (abbreviated as 5GC). 5GC uses general-purpose network function virtualization equipment to replace the dedicated communication equipment of a 4G network. For example, the core network of a 4G network is the evolved packet core (EPC). The EPC has traditional mobile network capabilities such as user subscription data storage, mobility management, and data exchange, and can provide users with an ultra-high-speed Internet experience.

[0266] In this embodiment of the present application, a first cell belongs to an access network of a first network, and a base station of the first cell is an access network device in the first network. For example, assume that the first cell is a 5G cell. When an electronic device resides in a 5G cell, the electronic device communicates with the gNB of the 5G cell, and the gNB communicates with the 5GC.

[0267] The second cell belongs to the access network of the second network, and the base station of the second cell is an access network device in the second network. For example, assume that the second cell is a 4G cell. When the electronic device resides in the 4G cell, the electronic device communicates with the eNB of the 4G cell, and the eNB communicates with the EPC.

[0268] In some embodiments, the process of the electronic device accessing a second cell indicated by the handover command involves interaction between the electronic device, an access network device of the second network (ie, a base station of the second cell), and a core network of the second network.

[0269] Assuming that the electronic device accesses the second cell using a non-contention random access method, the switching command sent by the first cell to the electronic device may also include a non-contention random access preamble assigned to the electronic device. In this case, the switching command may also be called an MSG0 message.

[0270] In this case, assuming that the second cell is a 4G cell, the process of the electronic device accessing a 4G cell indicated by the switching command involves interaction between the electronic device, the eNB of the 4G cell, and the EPC, as described in detail in the embodiment of Figure 9 below.

[0271] FIG9 is a schematic diagram of a cell access process provided by an embodiment of the present application. Referring to FIG9 , the cell access process may include the following steps 901 to 908 .

[0272] Step 901: The electronic device sends a random access prefix to the eNB of the 4G cell.

[0273] For example, the electronic device may reside in the 4G cell according to the cell identifier of the 4G cell included in the handover command, and send the random access prefix assigned in the handover command to the eNB of the 4G cell.

[0274] For example, the electronic device may carry the random access prefix in a MSG1 message and send it to the eNB.

[0275] Step 902: After receiving the random access prefix, the eNB sends a random access response message to the electronic device.

[0276] For example, the random access response message may also be called a MSG2 message.

[0277] It should be noted that after the cell where the electronic device resides changes, the electronic device will find that its tracking area (TA) or TA list has changed, wherein one TA list contains multiple TAs.

[0278] After receiving the random access response message sent by the eNB, the electronic device has actually accessed the 4G cell. However, since the cell where the electronic device resides has changed, the electronic device needs to perform a tracking area update (TAU) after accessing the 4G cell to notify the network side (i.e., the eNB and EPC) of its current TA. Therefore, after receiving the random access response message, the electronic device also performs the following steps 903 to 908 to perform a TAU.

[0279] Step 903: After receiving the random access response message, the electronic device sends an RRC connection reconfiguration complete message to the eNB. The RRC connection reconfiguration complete message includes a TAU request message of the NAS layer.

[0280] In some embodiments, after receiving the handover command, the electronic device may first configure the relevant RBs according to the RB configuration information in the handover command, for example, SRB1, SRB2, and DRB. In this case, in step 903, the electronic device may send the RRC connection reconfiguration complete message to the eNB via SRB1.

[0281] For example, the TAU request message may include the TAI of the TA in which the electronic device is currently located.

[0282] Step 904: After receiving the RRC connection reconfiguration complete message, the eNB sends an initial UE message to the EPC. The initial UE message includes a TAU request message.

[0283] Step 905: After receiving the initial UE message, the EPC sends a downlink NAS transport message to the eNB. The downlink NAS transport message includes a TAU acceptance message of the NAS layer.

[0284] Optionally, after receiving the initial UE message, if the EPC determines that the electronic device is accessing for the first time, the EPC may perform authentication (authentication / security) on the electronic device to create some security-related parameters for the electronic device.

[0285] Optionally, after receiving the initial UE message, the EPC may update the TA or TA list of the electronic device, and after the update, send a downlink NAS transmission message including a TAU acceptance message to the eNB.

[0286] Step 906: After receiving the downlink NAS transfer message, the eNB sends a downlink information transfer (DL information transfer) message to the electronic device, where the downlink information transfer message includes a TAU acceptance message.

[0287] Step 907: After receiving the downlink information transfer message, the electronic device sends an uplink information transfer (UL information transfer) message to the eNB. The uplink information transfer message includes a TAU complete message of the NAS layer.

[0288] Optionally, the electronic device may send the uplink information transmission message to the eNB via SRB2.

[0289] Step 908: After receiving the uplink information transport message, the eNB sends an uplink NAS transport message to the EPC. The uplink NAS transport message includes a TAU completion message.

[0290] After the EPC receives the TAU completion message, the TAU process is completed.

[0291] At this point, the electronic device has completed the cell access process and the related TAU process. After the electronic device accesses the 4G cell, it can perform service data transmission through the 4G cell.

[0292] It should be noted that the embodiment of the present application only uses the embodiment of FIG. 9 above as an example to exemplify the process of an electronic device accessing a second cell indicated by the handover command, and the embodiment of FIG. 9 above does not limit the embodiment of the present application. The electronic device may also access a second cell indicated by the handover command in other ways different from the embodiment of FIG. 9 above, and the embodiment of the present application is not limited to this.

[0293] In an embodiment of the present application, when an electronic device accesses a first cell, if it measures that the signal quality of the first cell is lower than the signal quality threshold, a target event is sent to the first cell, and the target event is used to indicate that the signal quality of the neighboring cell of the different system is higher than the signal quality threshold. Afterwards, the electronic device receives a redirection message or a switching command sent by the first cell. The redirection frequency carried by the redirection message is the frequency of the second cell, and the switching command indicates switching to a second cell. Afterwards, the electronic device can access a second cell corresponding to the redirection frequency, or access a second cell indicated by the switching command. Since the success rate of the electronic device accessing the second cell is relatively high, it can avoid repeated redirection of the electronic device in a short period of time to a certain extent, and then can avoid the problem of service jamming or even interruption to a certain extent.

[0294] FIG10 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG10 , the method includes the following steps:

[0295] Step 1001: An electronic device accesses a first cell.

[0296] The operation of step 1001 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0297] Step 1002: The electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, and sends an A2 event to the first cell.

[0298] The operation of step 1002 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0299] Step 1003: The first cell sends a redirection message to the electronic device.

[0300] The operation of step 1003 is similar to the operation of step 303 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0301] Step 1004: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0302] The operation of step 1004 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0303] In some embodiments, in step 1004, after receiving the redirection message, the electronic device may directly access the cell corresponding to the redirection frequency carried in the redirection message.

[0304] In other embodiments, in step 1004, after receiving the redirection message, the electronic device may further determine whether the cell identifier of the first cell is a problem cell identifier, and determine whether the frequency of the first cell is a problem frequency. If the cell identifier of the first cell is not a problem cell identifier and the frequency of the first cell is not a problem frequency, the electronic device may access the cell corresponding to the redirection frequency carried by the redirection message. If the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, the electronic device may determine whether the redirection message is a measurement redirection message or a blind redirection message; if the redirection message is a measurement redirection message, the electronic device may access the cell corresponding to the redirection frequency carried by the redirection message; if the redirection message is a blind redirection message, the electronic device does not access the cell corresponding to the redirection frequency carried by the redirection message, but instead implements the fifth strategy, which is: access a second cell, which is a heterogeneous system neighboring cell of the first cell.

[0305] As an example, if the electronic device receives a measurement configuration message from the first cell after sending an A2 event to the first cell, and then measures and reports the signal quality of the relevant cell to the first cell before receiving a redirection message from the first cell, then the redirection message is a measurement redirection message. If the electronic device receives a redirection message from the first cell after sending an A2 event to the first cell without measuring and reporting the signal quality of the relevant cell, then the redirection message is a blind redirection message.

[0306] Because the redirection frequency carried in the measurement redirection message is determined by the first cell based on the relevant cell signal quality reported by the electronic device, the electronic device has a higher success rate in accessing the cell corresponding to the redirection frequency carried in the measurement redirection message. Therefore, if the redirection message is a measurement redirection message, the electronic device can access the cell corresponding to the redirection frequency carried in the redirection message.

[0307] Because the redirection frequency carried in the blind redirection message is directly specified by the first cell, if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, the success rate of the electronic device accessing the cell corresponding to the redirection frequency carried in the blind redirection message is generally low. Therefore, in an embodiment of the present application, if the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, and the redirection message is a blind redirection message, the electronic device does not access the cell corresponding to the redirection frequency carried in the redirection message, but instead accesses a second cell. The second cell is a neighboring cell of a different system from the first cell, and the mobile communication technology standard supported by the second cell is lower than that supported by the first cell. In this case, the electronic device actually falls back from the first cell to the second cell during redirection. In this case, the electronic device has a higher success rate of accessing the second cell than if the electronic device accessed the cell corresponding to the redirection frequency directly specified by the first cell in the blind redirection message. This can, to a certain extent, prevent the electronic device from being repeatedly redirected in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0308] In some embodiments, the electronic device may access the second cell using a random access method (including but not limited to a contention-based random access method). Optionally, a possible implementation method for the electronic device to access the second cell may refer to the method described in the embodiment of FIG. 4 above, which will not be described in detail in this embodiment of the present application.

[0309] Step 1005: If the electronic device fails to access the cell corresponding to the redirection frequency, then if the redirection message is a blind redirection message, the fifth strategy is executed, which is: access a second cell.

[0310] If the electronic device fails to access the cell corresponding to the redirected frequency, and the redirection message is a measurement redirection message, the electronic device accesses a cell. In this case, the electronic device can perform a cell search, select a suitable cell from the searched cells, and then access it. The accessed cell may be the first cell or the second cell.

[0311] After the electronic device fails to access the cell corresponding to the redirection frequency, if the redirection message is a blind redirection message, the electronic device accesses a second cell.

[0312] Since the redirection frequency carried in the blind redirection message is directly specified by the first cell, if the electronic device fails to access the cell corresponding to the redirection frequency carried in the blind redirection message, it is reasonable to suspect that the same-system neighboring cells of the first cell are likely to have this problem. Therefore, in an embodiment of the present application, if the electronic device fails to access the cell corresponding to the redirection frequency carried in the blind redirection message, it directly accesses the first cell's different-system neighboring cell, i.e., the second cell.

[0313] After the electronic device accesses the second cell, on the one hand, it can, to a certain extent, avoid the problem of repeated redirection due to low cell signal quality. On the other hand, even if redirection is required later, since the redirection frequency indicated by the second cell is likely different from the redirection frequency indicated by the first cell, it can, to a certain extent, avoid the problem of the electronic device failing to access the cell corresponding to the redirection frequency. This can, to a certain extent, prevent the electronic device from repeatedly redirecting in a short period of time, and thus, to a certain extent, avoid service lag or even interruption.

[0314] In some embodiments, the electronic device may access the second cell using a random access method (including but not limited to a contention-based random access method). Optionally, a possible implementation method for the electronic device to access the second cell may refer to the method described in the embodiment of FIG. 4 above, which will not be described in detail in this embodiment of the present application.

[0315] In an embodiment of the present application, after receiving a redirection message sent by a first cell, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message. If the electronic device fails to access the cell corresponding to the redirection frequency, then if the redirection message is a blind redirection message, the electronic device accesses a second cell. In this way, subsequent redirection can be avoided to a certain extent, and even if a subsequent redirection occurs, the problem of the electronic device failing to access the cell corresponding to the redirection frequency can be avoided to a certain extent. This can, to a certain extent, prevent the electronic device from being repeatedly redirected in a short period of time, and thus, to a certain extent, prevent the problem of service lag or even interruption.

[0316] FIG11 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG11 , the method includes the following steps:

[0317] Step 1101: The electronic device accesses the target cell.

[0318] The operation of step 1101 is similar to the operation of step 301 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0319] Step 1102: If the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, then when the signal quality threshold of the target cell is lower than the preset signal quality, the electronic device determines a fourth number of times.

[0320] After the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, if the signal quality threshold of the target cell is not lower than the preset signal quality, an A2 event can be sent to the target cell; if the signal quality threshold of the target cell is lower than the preset signal quality, it is necessary to first determine the fourth number of times, and then determine whether to send the A2 event to the target cell based on this.

[0321] The fourth number is the number of failed attempts to access the cell corresponding to the redirection frequency carried in the redirection message within a fourth preset time period before the current moment. The fourth preset time period can be pre-set. For example, the fourth preset time period can be 1 day, 2 days, 1 month, etc., and is not limited in this embodiment of the present application.

[0322] It should be noted that the "fourth number" described in the embodiments of the present application is determined based on the redirection message and is used to indicate the number of redirection failures. That is, after any cell sends a redirection message to an electronic device, if the electronic device fails to successfully access the cell corresponding to the redirection frequency carried in the redirection message, the electronic device determines that a redirection failure has occurred, which can be counted as the fourth number. In other words, even if the electronic device searches for multiple cells corresponding to the redirection frequency carried in the redirection message, but fails to access all of the multiple cells, the electronic device still determines that a redirection failure has occurred.

[0323] For example, the signal quality threshold can be a threshold for an A2 event. The threshold for an A2 event is generally configured on the network side, and the network side may configure one or more thresholds for the A2 event. When the electronic device measures that the signal quality of the target cell is lower than any of the thresholds, the A2 event is triggered.

[0324] When the electronic device measures that the signal quality of the target cell is lower than the corresponding threshold, it can report an A2 event carrying the signal quality of the target cell to the target cell. After receiving the A2 event, the target cell can perform measurement redirection or blind redirection.

[0325] Generally, when the signal quality of the target cell carried in the A2 event is high, the target cell will perform measurement redirection; and when the signal quality of the target cell carried in the A2 event is low, the target cell will perform blind redirection.

[0326] The preset signal quality can be set in advance. The preset signal quality is the signal quality that is likely to trigger blind redirection in the target cell. In other words, when the signal quality of the target cell carried in the A2 event is lower than the preset signal quality, the target cell is likely to perform blind redirection after receiving the A2 event.

[0327] For example, the network side configures three thresholds for event A2, which are threshold 1, threshold 2, and threshold 3, from largest to smallest.

[0328] If the electronic device measures that the signal quality of the target cell is below threshold 1 and above or equal to threshold 2, it can send an A2 event containing the target cell's signal quality to the target cell. Upon receiving this A2 event, the target cell can instruct the electronic device to perform inter-frequency measurements. The target cell can then redirect the electronic device to a neighboring cell within the same system as the target cell based on the cell signal quality measured by the electronic device. This process is called measurement redirection.

[0329] If the electronic device measures that the target cell's signal quality is below threshold 2 and greater than or equal to threshold 3, it can send an A2 event containing the target cell's signal quality to the target cell. Upon receiving this A2 event, the target cell can instruct the electronic device to perform inter-system measurements. The target cell can then redirect the electronic device to an inter-system neighboring cell of the target cell based on the cell signal quality measured by the electronic device. This process is called measurement redirection.

[0330] If the electronic device measures the target cell's signal quality as below threshold 3, it can send an A2 event to the target cell, which contains the target cell's signal quality. Upon receiving the A2 event, the target cell can specify a frequency as the redirection frequency and instruct the electronic device to redirect to the cell corresponding to this frequency. This process is called blind redirection.

[0331] In this case, the preset signal quality may be lower than threshold 2 and higher than or equal to threshold 3.

[0332] After the electronic device determines the fourth number, if the fourth number is less than the fourth number threshold, the electronic device may send an A2 event carrying the signal quality of the target cell to the target cell. If the fourth number is greater than or equal to the fourth number threshold, the electronic device executes the following step 1103.

[0333] The fourth number threshold can be pre-set. For example, the fourth number threshold can be 4, 5, 6, etc., which is not limited in the embodiment of the present application.

[0334] Step 1103: If the fourth number is greater than or equal to the fourth number threshold, the electronic device executes the sixth strategy, which is: not sending the A2 event to the target cell.

[0335] If the signal quality of the target cell is lower than the preset signal quality, if the electronic device reports an A2 event, it is likely to trigger blind redirection of the target cell. If the fourth number of times is greater than or equal to the fourth number threshold, it means that the electronic device has previously attempted to access the cell corresponding to the redirection frequency carried in the redirection message multiple times but has failed. In this case, if the electronic device reports an A2 event and triggers blind redirection, it is likely that the electronic device will still fail to access the cell corresponding to the redirection frequency carried in the redirection message, which will cause significant service lag or even interruption. Therefore, in this embodiment of the present application, the electronic device does not report the A2 event in this situation to avoid triggering blind redirection, which can, to a certain extent, avoid the problem of service lag or even interruption. It should be noted that although the current signal quality of the target cell is poor, the electronic device can continue to access the target cell and continue to carry out services. Compared with the problem of the electronic device being unable to access the cell for a period of time due to access failure after blind redirection, which subsequently causes significant service lag or even interruption, it is obviously more beneficial for the electronic device to continue to maintain access to the target cell.

[0336] In some embodiments, in step 1102, when the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold and lower than the preset signal quality, it can also determine whether the cell identifier of the target cell is a problem cell identifier, and determine whether the frequency of the target cell is a problem frequency; if the cell identifier of the target cell is not a problem cell identifier and the frequency of the target cell is not a problem frequency, the electronic device can determine the fourth number of times, and only execute the sixth strategy, that is, not send the A2 event to the target cell, when the fourth number of times is greater than or equal to the fourth number threshold; if the cell identifier of the target cell is a problem cell identifier and / or the frequency of the target cell is a problem frequency, the electronic device does not need to determine the fourth number of times and can directly execute the sixth strategy, that is, not send the A2 event to the target cell.

[0337] In an embodiment of the present application, after the electronic device accesses the target cell, if the measured signal quality of the target cell is lower than the signal quality threshold, then when the signal quality of the target cell is lower than the preset signal quality, a fourth number of times is determined, and the fourth number of times is the number of times the electronic device fails to access the cell corresponding to the redirection frequency carried in the redirection message within the fourth preset time period before the current moment. If the fourth number of times is greater than or equal to the fourth number threshold, the electronic device implements the sixth strategy, that is, does not send an A2 event to the target cell to avoid triggering blind redirection. In this way, the problem of service jamming or even interruption can be avoided to a certain extent.

[0338] The first, second, third, fourth, fifth, and sixth strategies provided in the embodiments of Figures 3 to 11 above are all intended to address the problem of service jams or even interruptions. In some embodiments, these six strategies can be flexibly combined to further avoid service jams or even interruptions.

[0339] Generally speaking, the first strategy, the second strategy, the third strategy, the fourth strategy, the fifth strategy, and the sixth strategy make successively larger changes to the original process, and accordingly, the probability of them successfully solving the problem is also higher.

[0340] It is understandable that these six strategies can be combined in various ways. For example, they can be combined in pairs, such as: the first strategy + the second strategy, the first strategy + the third strategy, the first strategy + the fourth strategy, the first strategy + the fifth strategy, the first strategy + the sixth strategy, the second strategy + the third strategy, the second strategy + the fourth strategy, the second strategy + the fifth strategy, the second strategy + the sixth strategy, the third strategy + the fourth strategy, the third strategy + the fifth strategy, the third strategy + the sixth strategy, the fourth strategy + the fifth strategy, the fourth strategy + the sixth strategy, and the fifth strategy + the sixth strategy. You can also make three-by-three combinations, for example: the first strategy + the second strategy + the third strategy, the first strategy + the second strategy + the fourth strategy, the first strategy + the second strategy + the fifth strategy, the first strategy + the second strategy + the sixth strategy, the first strategy + the third strategy + the fourth strategy, the first strategy + the third strategy + the fifth strategy, the first strategy + the third strategy + the sixth strategy, the first strategy + the fourth strategy + the fifth strategy, the first strategy + the fourth strategy + the sixth strategy, the first strategy + the fifth strategy + the sixth strategy, the second strategy + the third strategy + the fourth strategy, the second strategy + the third strategy + the fifth strategy, the second strategy + the third strategy + the sixth strategy, the second strategy + the fourth strategy + the fifth strategy, the second strategy + the fourth strategy + the sixth strategy, the second strategy + the fifth strategy + the sixth strategy, the third strategy + the fourth strategy + the fifth strategy, the third strategy + the fourth strategy + the sixth strategy, the fourth strategy + the fifth strategy + the sixth strategy. Four-by-four combinations can also be made, for example: the first strategy + second strategy + third strategy + fourth strategy, the first strategy + second strategy + third strategy + fifth strategy, the first strategy + second strategy + third strategy + sixth strategy, the first strategy + second strategy + fourth strategy + fifth strategy, the first strategy + second strategy + fourth strategy + sixth strategy, the first strategy + second strategy + fifth strategy + sixth strategy, the first strategy + third strategy + fourth strategy + fifth strategy, the first strategy + third strategy + fourth strategy + sixth strategy, the first strategy + third strategy + fifth strategy + sixth strategy, the first strategy + fourth strategy + fifth strategy + sixth strategy, the second strategy + third strategy + fourth strategy + fifth strategy, the second strategy + third strategy + fourth strategy + fifth strategy, the second strategy + third strategy + fourth strategy + sixth strategy, the second strategy + third strategy + fifth strategy + sixth strategy. You can also make 50-5 combinations, for example: first strategy + second strategy + third strategy + fourth strategy + fifth strategy, first strategy + second strategy + third strategy + fourth strategy + sixth strategy, first strategy + second strategy + third strategy + fifth strategy + sixth strategy, first strategy + second strategy + fourth strategy + fifth strategy + sixth strategy, first strategy + third strategy + fourth strategy + fifth strategy + sixth strategy, second strategy + third strategy + fourth strategy + fifth strategy + sixth strategy.You can also combine six strategies: first strategy + second strategy + third strategy + fourth strategy + fifth strategy + sixth strategy.

[0341] In some embodiments, when each of the above combinations is executed, the first strategy is executed first to solve the problem, and the second strategy is executed if the problem still occurs after the first strategy is executed. This will be described in detail below.

[0342] Next, a possible combination of the embodiment of FIG. 3 and the embodiment of FIG. 5 is explained in detail.

[0343] FIG12 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG12 , the method includes the following steps:

[0344] Step 1201: The electronic device accesses the target cell.

[0345] The operation of step 1201 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0346] Step 1202: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0347] The operation of step 1202 is similar to the operation of step 302 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0348] Step 1203: The target cell sends a redirection message to the electronic device.

[0349] The operation of step 1203 is similar to the operation of step 303 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0350] Step 1204: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0351] The operation of step 1204 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.

[0352] Step 1205: If the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device determines whether the first strategy has been executed within the fifth preset time period before the current moment. If not, step 1206 is executed; if so, step 1207 is executed.

[0353] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., which is not limited in this embodiment of the present application.

[0354] Step 1206: If the electronic device has not executed the first strategy within the fifth preset time period before the current moment, determine the first number, and execute the first strategy when the first number is greater than or equal to the first number threshold. The first strategy is: access a cell other than the target cell.

[0355] The operation of step 1206 is similar to the operation of step 305 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0356] Step 1207: If the electronic device has executed the first strategy within the fifth preset time period before the current moment, the second number is determined, and the second strategy is executed when the second number is greater than or equal to the second number threshold. The second strategy is: access a cell corresponding to a frequency other than the target frequency, and the target frequency is the frequency of the target cell.

[0357] The operation of step 1206 is similar to the operation of step 505 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0358] In the embodiment of the present application, when an electronic device encounters a problem of failing to access a cell corresponding to a redirected frequency, the electronic device will first employ the first strategy to resolve the problem. If the problem recurs after executing the first strategy, the electronic device will then employ the second strategy to resolve the problem. Generally, the second strategy has a higher probability of successfully resolving the problem than the first strategy.

[0359] The technical effects obtained by the embodiment of FIG12 above are similar to the technical effects obtained by the corresponding technical means in the embodiment of FIG3 and FIG5 above, and will not be described in detail in the embodiment of the present application.

[0360] Next, a possible combination of the embodiment of FIG. 3 and the embodiment of FIG. 6 is explained in detail.

[0361] FIG13 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG13 , the method includes the following steps:

[0362] Step 1301: The electronic device accesses the target cell.

[0363] The operation of step 1301 is similar to the operation of step 301 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0364] Step 1302: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0365] The operation of step 1302 is similar to the operation of step 302 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0366] Step 1303: The target cell sends a redirection message to the electronic device.

[0367] The operation of step 1303 is similar to the operation of step 303 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0368] Step 1304: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0369] The operation of step 1304 is similar to the operation of step 304 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0370] Step 1305: If the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device determines whether the first strategy has been executed within the fifth preset time period before the current moment. If not, step 1306 is executed; if so, step 1307 is executed.

[0371] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., which is not limited in this embodiment of the present application.

[0372] Step 1306: If the electronic device has not executed the first strategy within the fifth preset time period before the current moment, determine the first number and execute the first strategy when the first number is greater than or equal to the first number threshold. The first strategy is: access a cell other than the target cell.

[0373] The operation of step 1306 is similar to the operation of step 305 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0374] Step 1307: If the electronic device has executed the first strategy within the fifth preset time period before the current moment, the third number is determined, and the third strategy is executed when the third number is greater than or equal to the third number threshold. The third strategy is: access a cell, and send target information to the cell after accessing the cell. The target information is used to indicate that the electronic device does not support the specified frequency band, and the specified frequency band is the frequency band where the redirected frequency point is located.

[0375] The operation of step 1306 is similar to the operation of step 605 in the embodiment of Figure 6 above, and will not be repeated in this embodiment of the present application.

[0376] In the embodiment of the present application, when an electronic device fails to access a cell corresponding to a redirected frequency, it will first employ the first strategy to resolve the issue. If the issue recurs after the first strategy is implemented, the third strategy will be employed to resolve the issue. Generally, the third strategy has a higher probability of successfully resolving the issue than the first strategy.

[0377] The technical effects obtained by the embodiment of FIG13 above are similar to the technical effects obtained by the corresponding technical means in the embodiment of FIG3 and FIG6 above, and will not be described in detail in the embodiment of the present application.

[0378] Next, a possible combination of the embodiment of FIG. 5 and the embodiment of FIG. 6 is explained in detail.

[0379] FIG14 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG14 , the method includes the following steps:

[0380] Step 1401: The electronic device accesses the target cell.

[0381] The operation of step 1401 is similar to the operation of step 501 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0382] Step 1402: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0383] The operation of step 1402 is similar to the operation of step 502 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0384] Step 1403: The target cell sends a redirection message to the electronic device.

[0385] The operation of step 1403 is similar to the operation of step 503 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0386] Step 1404: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0387] The operation of step 1404 is similar to the operation of step 504 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0388] Step 1405: If the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device determines whether the second strategy has been executed within the fifth preset time period before the current moment. If not, step 1406 is executed; if so, step 1407 is executed.

[0389] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., which is not limited in this embodiment of the present application.

[0390] Step 1406: If the electronic device has not executed the second strategy within the fifth preset time period before the current moment, determine the second number, and execute the second strategy when the second number is greater than or equal to the second number threshold. The second strategy is: access a cell corresponding to a frequency other than the target frequency, and the target frequency is the frequency of the target cell.

[0391] The operation of step 1406 is similar to the operation of step 505 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0392] Step 1407: If the electronic device has executed the second strategy within the fifth preset time period before the current moment, the third number is determined, and the third strategy is executed when the third number is greater than or equal to the third number threshold. The third strategy is: access a cell, and send target information to the cell after accessing the cell. The target information is used to indicate that the electronic device does not support the specified frequency band, and the specified frequency band is the frequency band where the redirected frequency point is located.

[0393] The operation of step 1406 is similar to the operation of step 605 in the embodiment of Figure 6 above, and will not be repeated in this embodiment of the present application.

[0394] In the embodiment of the present application, when an electronic device fails to access a cell corresponding to a redirected frequency, it will first employ the second strategy to resolve the issue. If the issue recurs after implementing the second strategy, the third strategy will be employed to resolve the issue. Generally, the third strategy has a higher probability of successfully resolving the issue than the second strategy.

[0395] The technical effects obtained by the embodiment of FIG14 above are similar to the technical effects obtained by the corresponding technical means in the embodiment of FIG5 and FIG6 above, and will not be described in detail in the embodiment of the present application.

[0396] Next, a possible combination of the embodiment of FIG. 3 , the embodiment of FIG. 5 , and the embodiment of FIG. 6 will be explained in detail.

[0397] FIG15 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG15 , the method includes the following steps:

[0398] Step 1501: The electronic device accesses the target cell.

[0399] The operation of step 1501 is similar to the operation of step 301 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0400] Step 1502: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and sends an A2 event to the target cell.

[0401] The operation of step 1502 is similar to the operation of step 302 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0402] Step 1503: The target cell sends a redirection message to the electronic device.

[0403] The operation of step 1503 is similar to the operation of step 303 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0404] Step 1504: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0405] The operation of step 1504 is similar to the operation of step 304 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0406] Step 1505: If the electronic device fails to access the cell corresponding to the redirected frequency, the electronic device determines whether the first strategy has been executed within the fifth preset time period before the current moment. If not, step 1506 is executed; if so, step 1507 is executed.

[0407] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., which is not limited in this embodiment of the present application.

[0408] Step 1506: If the electronic device has not executed the first strategy within the fifth preset time period before the current moment, determine the first number and execute the first strategy when the first number is greater than or equal to the first number threshold. The first strategy is: access a cell other than the target cell.

[0409] The operation of step 1506 is similar to the operation of step 305 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0410] Step 1507: If the electronic device has executed the first policy within the fifth preset time period before the current moment, the electronic device determines whether the second policy has been executed within the fifth preset time period before the current moment. If not, the process proceeds to step 1508; if so, the process proceeds to step 1509.

[0411] Step 1508: If the electronic device has not executed the second strategy within the fifth preset time period before the current moment, the second number is determined, and the second strategy is executed when the second number is greater than or equal to the second number threshold. The second strategy is: access a cell corresponding to a frequency other than the target frequency, and the target frequency is the frequency of the target cell.

[0412] The operation of step 1508 is similar to the operation of step 505 in the embodiment of Figure 5 above, and will not be repeated in this embodiment of the present application.

[0413] Step 1509: If the electronic device has executed the second strategy within the fifth preset time period before the current moment, the third number is determined, and the third strategy is executed when the third number is greater than or equal to the third number threshold. The third strategy is: access a cell, and send target information to the cell after accessing the cell. The target information is used to indicate that the electronic device does not support the specified frequency band, and the specified frequency band is the frequency band where the redirected frequency point is located.

[0414] The operation of step 1509 is similar to the operation of step 605 in the embodiment of Figure 6 above, and will not be repeated in this embodiment of the present application.

[0415] In the embodiment of the present application, when an electronic device fails to access a cell corresponding to a redirected frequency, it will first implement the first strategy to resolve the issue. If the issue recurs after implementing the first strategy, the second strategy will be implemented to resolve the issue. If the issue still recurs after implementing the second strategy, the third strategy will be implemented to resolve the issue. Generally, the probability of successfully resolving the issue increases with the first strategy, the second strategy, and the third strategy.

[0416] The technical effects obtained by the embodiment of FIG15 above are similar to the technical effects obtained by the corresponding technical means in the embodiment of FIG3 above, the embodiment of FIG5 above and the embodiment of FIG6 above, and will not be described in detail in the embodiment of the present application.

[0417] Next, a possible combination of one or more of the embodiments of FIG. 3 , FIG. 5 , and FIG. 6 with the embodiment of FIG. 7 will be explained in detail.

[0418] FIG16 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG16 , the method includes the following steps:

[0419] Step 1601: An electronic device accesses a first cell.

[0420] The operation of step 1601 is similar to the operation of step 701 in the embodiment of Figure 7 above, and will not be repeated in this embodiment of the present application.

[0421] Step 1602: The electronic device measures that the signal quality of the first cell is below the signal quality threshold and determines whether all of the first preset policies have been executed within the fifth preset time period before the current moment. If not, the electronic device executes steps 1603 to 1605. If so, the electronic device executes steps 1606 to 1608.

[0422] The first preset policy can be pre-set. The first preset policy is a policy executed by the electronic device after failing to access the cell corresponding to the redirection frequency carried in the redirection message. The first preset policy is a policy used to resolve service freezes or even interruptions. The first preset policy may include one or more of the first policy, the second policy, and the third policy.

[0423] It should be noted that if the electronic device has not executed any strategy in the first preset strategy within the fifth preset time period before the current moment, or has only executed part of the strategies in the first preset strategy, it can be determined that the electronic device has not executed all strategies in the first preset strategy within the fifth preset time period before the current moment.

[0424] Step 1603: If the electronic device has not executed all the policies in the first preset policy within the fifth preset time period before the current moment, the electronic device sends an A2 event to the first cell.

[0425] The operation of step 1603 is similar to the operation of step 302 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0426] Step 1604: The first cell sends a redirection message to the electronic device.

[0427] The operation of step 1604 is similar to the operation of step 303 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0428] Step 1605: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0429] The operation of step 1605 is similar to the operation of step 304 in the embodiment of Figure 3 above, and will not be repeated in this embodiment of the present application.

[0430] It should be noted that, in some embodiments, if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, it can continue to perform relevant operations according to the above Figure 3 embodiment, Figure 5 embodiment, Figure 6 embodiment, Figure 13 embodiment, Figure 14 embodiment, or Figure 15 embodiment.

[0431] Step 1606: If the electronic device has executed all strategies in the first preset strategy within the fifth preset time period before the current moment, the electronic device executes the fourth strategy, which is: sending a target event to the first cell, and the target event is used to indicate that the signal quality of the heterosystem neighboring cell is higher than the signal quality threshold.

[0432] If the electronic device has executed all strategies of the first preset strategy within the fifth preset time period before the current moment, it means that the probability of the electronic device failing to access the cell corresponding to the redirected frequency point is high. Then, when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it can send a target event to the first cell.

[0433] The operation of step 1606 is similar to the operation of step 702 in the embodiment of Figure 7 above, and will not be repeated in this embodiment of the present application.

[0434] Step 1607: The first cell sends a redirection message or a handover command to the electronic device. The redirection frequency carried in the redirection message is the frequency of the second cell. The handover command is used to instruct handover to a second cell, which is a neighboring cell of a different system of the first cell.

[0435] The operation of step 1607 is similar to the operation of step 703 in the embodiment of Figure 7 above, and will not be repeated in this embodiment of the present application.

[0436] Step 1608: If the electronic device receives the redirection message, it accesses a second cell corresponding to the redirection frequency carried in the redirection message; if the electronic device receives the handover command, it accesses a second cell indicated by the handover command.

[0437] The operation of step 1608 is similar to the operation of step 704 in the embodiment of Figure 7 above, and will not be repeated in this embodiment of the present application.

[0438] The technical effects obtained by the embodiment of Figure 16 above are similar to the technical effects obtained by the corresponding technical means in the previous embodiments, and the embodiments of this application will not be repeated here.

[0439] Next, a possible combination of one or more of the embodiments of FIG. 3 , FIG. 5 , FIG. 6 , and FIG. 7 with the embodiment of FIG. 10 will be explained in detail.

[0440] FIG17 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG17 , the method includes the following steps:

[0441] Step 1701: An electronic device accesses a first cell.

[0442] The operation of step 1701 is similar to the operation of step 1001 in the embodiment of Figure 10 above, and will not be repeated in this embodiment of the present application.

[0443] Step 1702: The electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, and sends an A2 event to the first cell or executes the fourth strategy. The fourth strategy is: sending a target event to the first cell, and the target event is used to indicate that the signal quality of the neighboring cell of the different system is higher than the signal quality threshold.

[0444] As an example, when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it can directly send an A2 event to the first cell, or directly execute the fourth strategy.

[0445] As another example, when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it can determine whether to send an A2 event to the first cell or execute the fourth strategy through steps 1602, 1603 and 1606 in the embodiment of Figure 16 above.

[0446] Step 1703: The first cell sends a redirection message to the electronic device.

[0447] The operation of step 1703 is similar to the operation of step 1003 in the embodiment of Figure 10 above, and will not be repeated in this embodiment of the present application.

[0448] Step 1704: After receiving the redirection message, if the redirection message is a blind redirection message, the electronic device determines whether all policies in the second preset policy have been executed within the fifth preset time period before the current moment. If not, the electronic device executes step 1705; if so, the electronic device executes step 1706.

[0449] The second preset strategy can be set in advance. The second preset strategy is a strategy for resolving service jams or even interruptions. The second preset strategy can include one or more of the first strategy, the second strategy, the third strategy, and the fourth strategy.

[0450] It should be noted that if the electronic device has not executed any strategy in the second preset strategy within the fifth preset time period before the current moment, or has only executed part of the strategies in the second preset strategy, it can be determined that the electronic device has not executed all strategies in the second preset strategy within the fifth preset time period before the current moment.

[0451] It should be noted that after receiving the redirection message, if the redirection message is a measurement redirection message, the electronic device can access the cell corresponding to the redirection frequency carried in the redirection message.

[0452] Step 1705: If the electronic device has not executed all the policies in the second preset policy within the fifth preset time period before the current moment, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0453] The operation of step 1705 is similar to the operation of step 1004 in the embodiment of Figure 10 above, and will not be repeated in this embodiment of the present application.

[0454] It should be noted that if the electronic device fails to access the cell corresponding to the redirection frequency carried in the redirection message, it may also perform related operations according to step 1005 in the embodiment of FIG10 .

[0455] Step 1706: If the electronic device has executed all the policies in the second preset policy within the fifth preset time period before the current moment, the electronic device executes the fifth policy, which is: accessing a second cell, which is a different system neighboring cell of the first cell.

[0456] The operation of step 1706 is similar to the operation of step 1005 in the embodiment of Figure 10 above, and will not be repeated in this embodiment of the present application.

[0457] The technical effects obtained by the embodiment of Figure 17 above are similar to the technical effects obtained by the corresponding technical means in the previous embodiments, and will not be repeated in the embodiments of this application.

[0458] Next, a possible combination of one or more of the embodiments of FIG. 3 , FIG. 5 , FIG. 6 , FIG. 7 , and FIG. 10 with the embodiment of FIG. 11 will be explained in detail.

[0459] FIG18 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG18 , the method includes the following steps:

[0460] Step 1801: The electronic device accesses the target cell.

[0461] The operation of step 1801 is similar to the operation of step 1101 in the embodiment of Figure 11 above, and will not be repeated in this embodiment of the present application.

[0462] Step 1802: If the electronic device measures that the signal quality of the target cell is below the signal quality threshold and the signal quality of the target cell is below the preset signal quality, the electronic device determines whether all of the third preset policies have been executed within the fifth preset time period before the current moment. If not, the electronic device executes step 1803. If so, the electronic device executes steps 1804 and 1805.

[0463] The third preset strategy can be pre-set. The third preset strategy is a strategy for resolving service freezes or even interruptions. The third preset strategy may include one or more of the first strategy, the second strategy, the third strategy, the fourth strategy, and the fifth strategy.

[0464] It should be noted that if the electronic device has not executed any strategy in the third preset strategy within the fifth preset time period before the current moment, or has only executed part of the strategies in the third preset strategy, it can be determined that the electronic device has not executed all strategies in the third preset strategy within the fifth preset time period before the current moment.

[0465] It should be noted that after the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, if the signal quality threshold of the target cell is not lower than the preset signal quality, it can send an A2 event to the target cell or execute the fourth strategy. The fourth strategy is: send a target event to the target cell. The target event is used to indicate that the signal quality of the neighboring cell of the different system is higher than the signal quality threshold.

[0466] As an example, after the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, if the signal quality threshold of the target cell is not lower than the preset signal quality, it can directly send an A2 event to the target cell or directly execute the fourth strategy.

[0467] As another example, after the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, if the signal quality threshold of the target cell is not lower than the preset signal quality, it can determine whether to send an A2 event to the target cell or execute the fourth strategy through steps 1602, 1603 and 1606 in the embodiment of Figure 16 above.

[0468] In some embodiments, after the electronic device sends the A2 event to the target cell or executes the fourth strategy, it can continue to perform related operations according to the embodiment of FIG. 17 above.

[0469] Step 1803: If the electronic device has not executed all the policies in the third preset policy within the fifth preset time period before the current moment, the electronic device sends an A2 event to the target cell or executes the fourth policy.

[0470] The operation of the electronic device sending the A2 event to the target cell or executing the fourth strategy is similar to the above, and will not be described in detail in the embodiment of the present application.

[0471] Step 1804: If the electronic device has executed all the strategies in the third preset strategy within the fifth preset time period before the current moment, the electronic device determines a fourth number of times.

[0472] The operation of step 1804 is similar to the operation of step 1102 in the embodiment of Figure 11 above, and will not be repeated in this embodiment of the present application.

[0473] After the electronic device determines the fourth number, if the fourth number is less than the fourth number threshold, the electronic device can send an A2 event to the target cell or execute the fourth strategy. The operation here is similar to the above, and this embodiment of the application will not be repeated.

[0474] Step 1805: If the fourth number is greater than or equal to the fourth number threshold, the electronic device executes the sixth strategy, which is: not sending the A2 event to the target cell.

[0475] The operation of step 1805 is similar to the operation of step 1103 in the embodiment of Figure 11 above, and will not be repeated in this embodiment of the present application.

[0476] The technical effects obtained by the embodiment of Figure 18 above are similar to the technical effects obtained by the corresponding technical means in the previous embodiments, and will not be repeated in the embodiments of this application.

[0477] The electronic device involved in the embodiments of the present application is described below.

[0478] FIG19 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Referring to FIG19 , the electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone jack 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display 194, and a subscriber identification module (SIM) card interface 195, etc. Among them, the sensor module 180 can include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

[0479] It should be understood that the structures illustrated in the embodiments of the present application do not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 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.

[0480] The processor 110 may include one or more processing units, for example, an application processor (AP), a modem (also known as a baseband processor), a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), and / or a neural-network processing unit (NPU). The different processing units may be independent devices or integrated into one or more processors.

[0481] The controller may be the nerve center and command center of the electronic device 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.

[0482] 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.

[0483] The wireless communication function of the electronic device 100 can be implemented through the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem, etc.

[0484] Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 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.

[0485] The mobile communication module 150 can provide solutions for wireless communications including 2G / 3G / 4G / 5G applied to the electronic device 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.

[0486] 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., which are applied to the electronic device 100. The wireless communication module 160 can be one or more devices that integrate 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.

[0487] In some embodiments, antenna 1 of electronic device 100 is coupled to mobile communication module 150, and antenna 2 is coupled to wireless communication module 160, so that electronic device 100 can communicate with a network and other devices via wireless communication technology. Wireless communication technology may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technology. GNSS may include the global positioning system (GPS), the global navigation satellite system (GLONASS), the Beidou navigation satellite system (BDS), the quasi-zenith satellite system (QZSS) and / or the satellite based augmentation system (SBAS).

[0488] The SIM card interface 195 is used to connect a SIM card. The SIM card can be connected to and separated from the electronic device 100 by inserting it into or removing it from the SIM card interface 195. The electronic device 100 can support 1 or N SIM card interfaces, where N is an integer greater than 1. The SIM card interface 195 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The types of the multiple cards can be the same or different. The SIM card interface 195 can also be compatible with different types of SIM cards. The SIM card interface 195 can also be compatible with external memory cards. The electronic device 100 interacts with the network through the SIM card to implement functions such as calls and data communications. In some embodiments, the electronic device 100 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

[0489] In the embodiment of the present application, an operating system runs on the above components, such as the iOS operating system developed by Apple, the Android open source operating system developed by Google, and the Windows operating system developed by Microsoft.

[0490] The operating system of the electronic device 100 can adopt a layered architecture, an event-driven architecture, a micro-kernel architecture, a microservice architecture, or a cloud architecture. The embodiment of the present application takes the Android system with a layered architecture as an example to illustrate the hardware and software structure of the electronic device 100. It should be noted that although the embodiment of the present application is described using the Android system as an example, its basic principles are also applicable to electronic devices 100 based on operating systems such as iOS or Windows.

[0491] Figure 20 is a software structure block diagram of an electronic device 100 provided in an embodiment of the present application. The software structure adopts a layered architecture, which divides the software into several layers, each with a clear role and division of labor. The layers communicate with each other through software interfaces. Taking the Android system running on an AP as an example, in some embodiments, the Android system is divided into five layers, from top to bottom, namely the application layer, the application framework layer (Framework), the Android runtime (Android runtime) and system library, the hardware abstraction layer (HAL) and the kernel layer (Kernel).

[0492] The application layer may include a series of application packages. Application packages may include camera, gallery, calendar, call, map, wireless local area network (WLAN), Bluetooth, music, video, short message, etc. The application layer may also include system UI (system UI), which is used to display the interface of electronic device 100, such as the signal icon corresponding to the SIM card and the call interface.

[0493] The application framework layer provides an application programming interface (API) and a programming framework for the applications in the application layer. The application framework layer includes some predefined functions. For example, the application framework layer may include a window manager, a content provider, a view system, a phone manager, a resource manager, a notification manager, etc. The phone manager is used to provide call functions for the electronic device 100, such as management of call status (including connecting, hanging up, etc.). The phone manager is represented by telephony in Figure 20. The application framework layer may also include a wireless communication interface layer (radio interface layer, RIL). The modem can exchange information with the telephony through the RIL.

[0494] The modem may include a NAS layer, an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control protocol (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. Each of the aforementioned layers may be a software module. The modem may interact with the base station via an antenna. Optionally, the method provided in the embodiments of the present application may be implemented by a modem.

[0495] Some embodiments of the present application provide an electronic device, which includes: one or more processors and a memory; the memory is used to store computer program code, and the computer program code includes computer instructions. When the one or more processors execute the computer instructions, the electronic device executes the above-mentioned cell access method.

[0496] Some embodiments of the present application provide a chip system for use in electronic devices. The chip system includes at least one processor and an interface, wherein the interface is configured to receive instructions and transmit them to the at least one processor; the at least one processor executes the instructions, causing the electronic device to perform the cell access method described above. The chip system may be a modem, or a system on chip (SoC) including a modem, and the method described above may be implemented by a modem.

[0497] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center via a wired (such as a coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0498] The above are optional embodiments provided for this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the technical scope disclosed in this application should be included in the scope of protection of this application.

Claims

1. A cell access method, characterized in that: Applied to electronic equipment, the method comprises: receiving a redirection message sent by a target cell; Accessing the cell corresponding to the redirection frequency carried in the redirection message; If access to the cell corresponding to the redirection frequency carried in the redirection message fails, determining a first number, where the first number is the number of failures to access the cell corresponding to the redirection frequency indicated by the target cell within a first preset time period before the current moment; If the first number is greater than or equal to a first number threshold, a first strategy is executed, where the first strategy is: accessing a cell other than the target cell.

2. The method according to claim 1, characterized in that If access to the cell corresponding to the redirection frequency carried in the redirection message fails, before determining the first number, the method further includes: If the cell corresponding to the redirection frequency carried in the redirection message is not searched, it is determined that access to the cell corresponding to the redirection frequency carried in the redirection message fails.

3. The method according to claim 1 or 2, characterized in that If access to the cell corresponding to the redirection frequency carried in the redirection message fails, determining the first number includes: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, determining the first number of times when the cell identifier of the target cell is not a problem cell identifier; The method further comprises: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, the first strategy is executed when the cell identifier of the target cell is a problem cell identifier.

4. The method according to any one of claims 1 to 3, characterized in that: After determining the first number, the method further includes: If the first number is greater than or equal to the first number threshold, the cell identifier of the target cell is recorded as a problem cell identifier.

5. The method according to claim 1 or 2, characterized in that: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, determining the first number includes: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, the first number of times is determined if the first strategy has not been executed within a fifth preset time period before the current moment.

6. The method according to claim 5, characterized in that The method further comprises: If access to the cell corresponding to the redirection frequency carried by the redirection message fails, then when the first strategy has been executed within a fifth preset time period before the current moment, a second number is determined, where the second number is the number of failures to access the cell corresponding to the redirection frequency indicated by the cell corresponding to the target frequency within the second preset time period before the current moment, and the target frequency is the frequency of the target cell; If the second number is greater than or equal to the second number threshold, a second strategy is executed, where the second strategy is: accessing a cell corresponding to a frequency point other than the target frequency point.

7. The method according to claim 5, characterized in that The method further comprises: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, then if the first strategy has been executed within the fifth preset time before the current moment, a third number is determined, and the third number is the number at the current moment. The number of failures to access the cell corresponding to the redirection frequency within the third preset time period before the redirection frequency; If the third number is greater than or equal to the third number threshold, the third strategy is executed, and the third strategy is: access a cell, and send target information to the cell after accessing the cell, and the target information is used to indicate that the electronic device does not support a specified frequency band, and the specified frequency band is the frequency band where the redirected frequency point is located.

8. A cell access method, characterized in that: Applied to electronic equipment, the method comprises: receiving a redirection message sent by a target cell; Accessing the cell corresponding to the redirection frequency carried in the redirection message; If access to the cell corresponding to the redirection frequency carried by the redirection message fails, determining a second number, where the second number is the number of failures to access the cell corresponding to the redirection frequency indicated by the cell corresponding to the target frequency within a second preset time period before the current moment, where the target frequency is the frequency of the target cell; If the second number is greater than or equal to the second number threshold, a second strategy is executed, where the second strategy is: accessing a cell corresponding to a frequency point other than the target frequency point.

9. The method according to claim 8, characterized in that If access to the cell corresponding to the redirection frequency carried in the redirection message fails, before determining the second number, the method further includes: If the cell corresponding to the redirection frequency carried in the redirection message is not searched, it is determined that access to the cell corresponding to the redirection frequency carried in the redirection message fails.

10. The method according to claim 8 or 9, characterized in that If accessing the cell corresponding to the redirection frequency carried in the redirection message fails, determining the second number includes: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, determining the second number of times when the target frequency is not a problem frequency; The method further comprises: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, the second strategy is executed when the target frequency is a problem frequency.

11. The method according to any one of claims 8 to 10, characterized in that: After determining the second number, the method further includes: If the second number is greater than or equal to the second number threshold, the target frequency point is recorded as a problem frequency point.

12. The method according to claim 8 or 9, characterized in that If accessing the cell corresponding to the redirection frequency carried in the redirection message fails, determining the second number includes: If access to the cell corresponding to the redirection frequency carried in the redirection message fails, determining the second number of times if the second strategy has not been executed within a fifth preset time period before the current moment; The method further comprises: If access to the cell corresponding to the redirection frequency carried by the redirection message fails, then, if the second strategy has been executed within a fifth preset time period before the current moment, determine a third number, where the third number is the number of failures to access the cell corresponding to the redirection frequency within the third preset time period before the current moment; If the third number is greater than or equal to the third number threshold, the third strategy is executed, and the third strategy is: access a cell, and send target information to the cell after accessing the cell, and the target information is used to indicate that the electronic device does not support a specified frequency band, and the specified frequency band is the frequency band where the redirected frequency point is located.

13. A cell access method, characterized in that: Applied to electronic equipment, the method comprises: receiving a redirection message sent by a target cell; Accessing a cell corresponding to a redirection frequency carried in the redirection message, where a frequency band where the redirection frequency is located is a designated frequency band; If access to the cell corresponding to the redirected frequency fails, determining a third number, where the third number is the number of failed accesses to the cell corresponding to the redirected frequency within a third preset time period before the current moment; If the third number is greater than or equal to the third number threshold, a third strategy is executed, wherein the third strategy is: accessing a cell, and sending target information to the cell after accessing the cell, wherein the target information is used to indicate that the electronic device does not support the specified frequency band.

14. The method according to claim 13, characterized in that If access to the cell corresponding to the redirected frequency fails, before determining the third number, the method further includes: If the cell corresponding to the redirected frequency point is not searched, it is determined that access to the cell corresponding to the redirected frequency point fails.

15. The method according to claim 13 or 14, characterized in that The target information is user equipment UE capability information; and the sending the target information to the one cell includes: Sending a mobility registration update message to the one cell, where the mobility registration update message is used to indicate that UE capability information needs to be updated; Receiving a UE capability query message sent by the one cell; UE capability information is sent to the one cell, where the UE capability information is used to indicate that the electronic device does not support the designated frequency band.

16. The method according to any one of claims 13 to 15, characterized in that: If access to the cell corresponding to the redirected frequency fails, determining a third number includes: If access to the cell corresponding to the redirected frequency fails, determining the third number when the cell identifier of the target cell is not a problem cell identifier and the frequency of the target cell is not a problem frequency; The method further comprises: If access to the cell corresponding to the redirected frequency fails, the third strategy is executed when the cell identifier of the target cell is a problem cell identifier and / or the frequency of the target cell is a problem frequency.

17. A cell access method, characterized in that: Applied to electronic equipment, the method comprises: In the case of accessing the first cell, if the signal quality of the first cell is measured to be lower than the signal quality threshold, a fourth strategy is executed, wherein the fourth strategy is: sending a target event to the first cell, where the target event is used to indicate that the signal quality of the neighboring cell of the different system is higher than the signal quality threshold; If a redirection message sent by the first cell is received, a second cell corresponding to the redirection frequency carried by the redirection message is accessed, the redirection frequency carried by the redirection message is the frequency of the second cell, and the second cell is a cross-system neighboring cell of the first cell; or, if a switching command is received from the first cell, a second cell indicated by the switching command is accessed.

18. The method according to claim 17, characterized in that The target event is a B event, and the B event is a B1 event or a B2 event.

19. The method according to claim 17 or 18, characterized in that If the signal quality of the first cell is measured to be lower than a signal quality threshold, executing a fourth strategy includes: If the measured signal quality of the first cell is lower than the signal quality threshold, the fourth strategy is executed when the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency.

20. The method according to claim 17 or 18, characterized in that If the signal quality of the first cell is measured to be lower than a signal quality threshold, executing a fourth strategy includes: If the measured signal quality of the first cell is lower than the signal quality threshold, the fourth strategy is executed if all strategies in the first preset strategy have been executed within the fifth preset time period before the current moment, and the first preset strategy includes one or more of the first strategy, the second strategy, and the third strategy.

21. A cell access method, characterized in that: Applied to electronic equipment, the method comprises: receiving a redirection message sent by the first cell; Accessing the cell corresponding to the redirection frequency carried in the redirection message; If access to the cell corresponding to the redirection frequency fails, then when the redirection message is a blind redirection message, a fifth strategy is executed, and the fifth strategy is: access a second cell, and the second cell is a neighboring cell of a different system of the first cell.

22. The method according to claim 21, characterized in that The accessing a cell corresponding to the redirection frequency carried by the redirection message includes: If the cell identifier of the first cell is not a problem cell identifier and the frequency of the first cell is not a problem frequency, accessing the cell corresponding to the redirected frequency; If the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, when the redirection message is a measurement redirection message, access a cell corresponding to the redirection frequency; After receiving the redirection message sent by the first cell, the method further includes: If the cell identifier of the first cell is a problem cell identifier and / or the frequency of the first cell is a problem frequency, then when the redirection message is a blind redirection message, the fifth strategy is executed.

23. The method of claim 21, wherein: The accessing a cell corresponding to the redirection frequency carried by the redirection message includes: If all strategies in the second preset strategy are not executed within the fifth preset time before the current moment, access the cell corresponding to the redirected frequency point, and the second preset strategy includes one or more of the first strategy, the second strategy, the third strategy, and the fourth strategy; After receiving the redirection message sent by the first cell, the method further includes: If all the policies in the second preset policy have been executed within a fifth preset time period before the current moment, then if the redirection message is a blind redirection message, the fifth policy is executed.

24. A cell access method, characterized in that: Applied to electronic equipment, the method comprises: In the case of accessing the target cell, if the signal quality of the target cell is measured to be lower than the signal quality threshold, then when the signal quality of the target cell is lower than the preset signal quality, determine the fourth number of times, the fourth number of times being the number of failures to access the cell corresponding to the redirection frequency carried by the redirection message within a fourth preset time length before the current moment, and the preset signal quality is the signal quality that can trigger blind redirection; If the fourth number is greater than or equal to the fourth number threshold, a sixth strategy is executed, and the sixth strategy is: do not send an A2 event to the target cell.

25. The method of claim 24, wherein: If the measured signal quality of the target cell is lower than the signal quality threshold, determining the fourth number of times when the signal quality of the target cell is lower than the preset signal quality includes: If the measured signal quality of the target cell is lower than the signal quality threshold, When the signal quality is lower than the preset signal quality, the cell identifier of the target cell is not a problem cell identifier, and the frequency point of the target cell is not a problem frequency point, determining the fourth number; The method further comprises: If the measured signal quality of the target cell is lower than the signal quality threshold, the sixth strategy is executed when the signal quality of the target cell is lower than the preset signal quality, and the cell identifier of the target cell is a problem cell identifier and / or the frequency of the target cell is a problem frequency.

26. The method of claim 24, wherein: If the measured signal quality of the target cell is lower than the signal quality threshold, determining the fourth number of times when the signal quality of the target cell is lower than the preset signal quality includes: If the measured signal quality of the target cell is lower than the signal quality threshold, the fourth number of times is determined when the signal quality of the target cell is lower than the preset signal quality and all strategies in the third preset strategy have been executed within a fifth preset time length before the current moment, and the third preset strategy includes one or more of the first strategy, the second strategy, the third strategy, the fourth strategy, and the fifth strategy.

27. An electronic device, characterized in that: The electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the method according to any one of claims 1 to 26 when executed by the processor.

28. A chip system, characterized in that: The chip system is applied to an electronic device, and the chip system includes one or more processors, and the processor is used to call computer instructions so that the electronic device executes the method described in any one of claims 1 to 26.

29. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 1 to 26.

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