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

Abstract

The invention discloses a cell access method, electronic equipment, a chip system and a storage medium, and belongs to the technical field of communication. The method comprises the following steps: after the electronic equipment receives a redirection message sent by a target cell, if access to a cell corresponding to a redirection frequency point carried by the redirection message fails, determining a first number of times, the first number of times is the number of times of failure to access the cell corresponding to the redirection frequency point indicated by the target cell within a first preset duration before the current moment. And if the first number of times is greater than or equal to the first number of times threshold, accessing one cell except the target cell. Thus, subsequent redirection can be avoided to a certain extent, and even if subsequent redirection occurs, the problem that the electronic equipment fails to access the cell corresponding to the redirection frequency point can be avoided to a certain extent. Therefore, repeated redirection of the electronic equipment in a short time can be avoided to a certain extent, and then the problem of service lagging and even interruption can be avoided to a certain extent.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a cell access method, an electronic device, a chip system, and a storage medium. Background Art

[0002] Currently, when the signal quality of a user equipment (UE) in a serving cell is lower than a threshold value, the UE can report an A2 event to the serving cell, hoping that the serving cell will send an instruction to let the UE switch to another cell. After receiving the A2 event, the serving cell can send a redirection message to the UE. Then the UE can access the cell corresponding to the redirection frequency point carried in the redirection message. However, in actual situations, due to various factors, it is easy to have the problem that the UE fails to access the cell corresponding to the redirection frequency point, which may cause the business to freeze or even interrupt. Summary of the Invention

[0003] This application provides a cell access method, an electronic device, a chip system, and a storage medium, which can avoid the problem of business freeze or even interruption to a certain extent. The technical solutions are as follows:

[0004] 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. Then, it accesses the cell corresponding to the redirection frequency point carried in the redirection message. If the access to the cell corresponding to the redirection frequency point carried in the redirection message fails, a first count is determined. The first count is the number of times of failure to access the cell corresponding to the redirection frequency point indicated by the target cell within a first preset duration before the current moment. If the first count is greater than or equal to a first count threshold, a first strategy is executed. The first strategy is: access a cell other than the target cell.

[0005] If the first count is greater than or equal to the first count threshold, it means that the electronic device has tried to access the cell corresponding to the redirection frequency point indicated by the target cell multiple times but failed in a short period of time. In this case, it is reasonably suspected that this problem is very likely caused by the target cell. Therefore, in this application, after the access to the cell corresponding to the redirection frequency point fails, when the first count is greater than or equal to the first count threshold, the electronic device will prohibit returning to the target cell, that is, it will access a cell other than the target cell. This cell can be a same-system neighbor cell of the target cell or a different-system neighbor cell of the target cell.

[0006] After the electronic device accesses a cell other than the target cell, on the one hand, it can, to a certain extent, avoid the problem of redirection again due to low cell signal quality; on the other hand, even if redirection is required subsequently, since the redirection frequency points indicated by this cell other than the target cell are likely to be different from the redirection frequency points indicated by the target cell, it can, to a certain extent, avoid the problem of the electronic device failing to access the cell corresponding to the redirection frequency point. Thus, it can, to a certain extent, avoid the electronic device being redirected repeatedly in a short period of time, and then can, to a certain extent, avoid problems such as service stuttering or even interruption.

[0007] Optionally, after the electronic device receives the redirection message, if it fails to search for the cell corresponding to the redirection frequency point carried in the redirection message, it determines that the access to the cell corresponding to the redirection frequency point carried in the redirection message fails.

[0008] In blind redirection, the target cell directly designates a redirection frequency point. In this case, there may be no cell corresponding to the redirection frequency point near the electronic device, resulting in the electronic device failing to access the cell corresponding to the redirection frequency point.

[0009] Optionally, if the electronic device fails to access the cell corresponding to the redirection frequency point carried in the redirection message, the operation of the first number can be determined as follows: if the access to the cell corresponding to the redirection frequency point carried in the redirection message fails, and the cell identifier of the target cell is not the problem cell identifier, the electronic device determines the first number. And when the cell identifier of the target cell is the problem cell identifier, the electronic device directly executes the first strategy.

[0010] The problem cell identifier can be some cell identifiers pre-recorded by the electronic device. The problem cell identifier is used to identify the problem cell. If the electronic device fails to access the cell corresponding to the redirection frequency point indicated by a cell multiple times, the electronic device can record this cell as a problem cell. Therefore, after the electronic device fails to access the cell corresponding to the redirection frequency point carried in the redirection message, when the cell identifier of the target cell is the problem cell identifier, that is, when the target cell is a problem cell, it can directly execute the first strategy to access a cell other than the target cell.

[0011] Optionally, after the electronic device determines the first number, when the first number is greater than or equal to the first number threshold, it can record the cell identifier of the target cell as the problem cell identifier.

[0012] Optionally, if the electronic device fails to access the cell corresponding to the redirected frequency band 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 band carried in the redirection message, and the first policy has not been executed within the fifth preset time period before the current moment, the electronic device determines the first number.

[0013] As an example, if the electronic device fails to access the cell corresponding to the redirected frequency band carried in the redirection message, and the first policy has been executed within the fifth preset time period before the current moment, the second number is determined. The second number is the number of times that the electronic device fails to access the cell corresponding to the redirected frequency band indicated by the cell corresponding to the target frequency band within the second preset time period before the current moment. The target frequency band is the frequency band of the target cell. If the second number is greater than or equal to the second number threshold, the second policy is executed. The second policy is: access a cell corresponding to a frequency band other than the target frequency band.

[0014] As another example, if the electronic device fails to access the cell corresponding to the redirected frequency band carried in the redirection message, and the first policy has been executed within the fifth preset time period before the current moment, the third number is determined. The third number is the number of times that the electronic device fails to access the cell corresponding to the redirected frequency band 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 policy is executed. The third policy is: access a cell, and after accessing this cell, send target information to this cell. The target information is used to indicate that the electronic device does not support the specified frequency band. The specified frequency band is the frequency band where the redirected frequency band is located.

[0015] In a second aspect, a cell access method is provided. In this method, the electronic device receives a redirection message sent by the target cell. Then, the electronic device accesses the cell corresponding to the redirected frequency band carried in the redirection message. If the electronic device fails to access the cell corresponding to the redirected frequency band carried in the redirection message, the second number is determined. The second number is the number of times that the electronic device fails to access the cell corresponding to the redirected frequency band indicated by the cell corresponding to the target frequency band within the second preset time period before the current moment. The target frequency band is the frequency band of the target cell. If the second number is greater than or equal to the second number threshold, the second policy is executed. The second policy is: access a cell corresponding to a frequency band other than the target frequency band.

[0016] 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 for many 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 forbidden to return 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 from the target cell.

[0017] After an electronic device accesses a cell corresponding to a frequency other than the target frequency, on the one hand, the problem of redirection due to low cell signal quality can be avoided to a certain extent; on the other hand, even if redirection is required later, since the redirection frequency indicated by the cell corresponding to the frequency other than the target frequency is likely to be different from the redirection frequency indicated by the cell corresponding to the target frequency, the problem of failure of the electronic device to access the cell corresponding to the redirection frequency can be avoided to a certain extent. This can avoid repeated redirection of electronic devices in a short period of time to a certain extent, and then avoid service freezes or even interruptions to a certain extent.

[0018] 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.

[0019] In blind redirection, the target cell will directly specify a redirection frequency. In this case, there may be no cell corresponding to the redirection frequency near the electronic device, resulting in failure of the electronic device to access the cell corresponding to the redirection frequency.

[0020] 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 may be: if the electronic device fails to access the cell corresponding to the redirection frequency carried by the redirection message, then 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 executes the second strategy.

[0021] The problem frequency points may be some frequency points recorded in advance by the electronic device. If the electronic device fails to access the cell corresponding to the redirected frequency point indicated by the cell corresponding to a certain frequency point for multiple times, the electronic device may record this frequency point as the problem frequency point. Therefore, after the electronic device fails to access the cell corresponding to the redirected frequency point carried by the redirection message, if the frequency point of the target cell is the problem frequency point, the second strategy may be directly executed to access a cell corresponding to a frequency point other than the target frequency point.

[0022] Optionally, after the electronic device determines the second count, if the second count is greater than or equal to the second count threshold, the target frequency point can be recorded as a problematic frequency point.

[0023] Optionally, if the electronic device fails to access the cell corresponding to the redirected frequency point carried in the redirect message, the operation of determining the second count can be: if the electronic device fails to access the cell corresponding to the redirected frequency point carried in the redirect message, and the second policy has not been executed within the fifth preset duration before the current moment, determine the second count.

[0024] As an example, if the electronic device fails to access the cell corresponding to the redirected frequency point carried in the redirect message, and the second policy has been executed within the fifth preset duration before the current moment, determine the third count. The third count is the number of times of failing to access the cell corresponding to the redirected frequency point within the third preset duration before the current moment. If the third count is greater than or equal to the third count threshold, execute the third policy. The third policy is: access a cell, and after accessing this cell, send target information to this 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.

[0025] In a third aspect, a cell access method is provided. In this method, the electronic device receives a redirect message sent by a target cell. Then, access the cell corresponding to the redirected frequency point carried in the redirect message. The frequency band where the redirected frequency point is located is the specified frequency band. If the access to the cell corresponding to the redirected frequency point fails, determine the third count. The third count is the number of times of failing to access the cell corresponding to the redirected frequency point within the third preset duration before the current moment. If the third count is greater than or equal to the third count threshold, execute the third policy. The third policy is: access a cell, and after accessing this cell, send target information to this cell. The target information is used to indicate that the electronic device does not support the specified frequency band.

[0026] If the third number is greater than or equal to the third number threshold, it indicates that the electronic device has tried to access the cell corresponding to the redirected frequency point multiple times before but all failed. In this case, it is reasonably suspected that there is a problem with the frequency band where the redirected frequency point is located (i.e., the specified frequency band). Therefore, in this application, after the electronic device fails to access the cell corresponding to the redirected frequency point and 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 specified frequency band, this cell can learn that the electronic device does not support the specified frequency band after receiving the target information. Then, when redirection needs to be performed subsequently, the redirected frequency point indicated by this cell is likely not a frequency point within the specified frequency band, thus the problem of the electronic device failing to access the cell corresponding to the redirected frequency point can be avoided to a certain extent. This can avoid the electronic device from being redirected repeatedly in a short period of time to a certain extent, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0027] It should be noted that although the electronic device in this application sends target information to this cell to indicate that it does not support the specified frequency band, this is to prevent this cell from redirecting the electronic device to the specified frequency band subsequently, and it does not mean that the electronic device really does not support the specified frequency band. That is to say, even if the electronic device supports the specified frequency band, in the above situation, it will still send target information to this cell so that this cell thinks that the electronic device does not support the specified frequency band.

[0028] Optionally, after the electronic device receives the redirection message, if it does not search for the cell corresponding to the redirected frequency point carried in the redirection message, it determines that the access to the cell corresponding to the redirected frequency point carried in the redirection message fails.

[0029] In blind redirection, the target cell directly designates a redirected frequency point. In this case, there may be no cell corresponding to the redirected frequency point near the electronic device, resulting in the electronic device failing to access the cell corresponding to the redirected frequency point.

[0030] Optionally, the target information is UE capability information. The operation of the electronic device sending the target information to this cell can be: sending a mobility registration update message to this cell, where the mobility registration update message is used to indicate that the UE capability information needs to be updated; receiving the UE capability query message sent by this cell; and sending the UE capability information to this cell, where the UE capability information is used to indicate that the electronic device does not support the specified frequency band.

[0031] In this application, after the electronic device accesses this cell, it can actively trigger the mobility registration update process so that this cell queries the UE capability information. In this way, the electronic device can report the UE capability information to this cell to indicate that it does not support the specified frequency band.

[0032] Optionally, if the electronic device fails to access the cell corresponding to the redirected frequency point, the operation of determining the third number can be: if the access to the cell corresponding to the redirected frequency point fails, the third number is determined when the cell identifier of the target cell is not the problem cell identifier and the frequency point of the target cell is not the problem frequency point. And when the cell identifier of the target cell is the problem cell identifier and / or the frequency point of the target cell is the problem frequency point, the third policy is executed.

[0033] Fourthly, a cell access method is provided. In this method, when the electronic device accesses the first cell, if the measured signal quality of the first cell is lower than the signal quality threshold, the fourth policy is executed. The fourth policy is: sending a target event to the first cell, where the target event is used to indicate that the signal quality of the inter-system neighbor cell is higher than the signal quality threshold. Then, if the electronic device receives a redirection message sent by the first cell, it accesses a second cell corresponding to the redirected frequency point carried in the redirection message. The redirected frequency point carried in the redirection message is the frequency point of the second cell, and the second cell is an inter-system neighbor cell of the first cell; or, if the electronic device receives a handover command sent by the first cell, it accesses a second cell indicated by the handover command.

[0034] Exemplarily, the target event is a B event, and the B event can be a B1 event or a B2 event.

[0035] 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 originally report an A2 event to the first cell. However, in the related art, after receiving the A2 event, the first cell is very likely to instruct the electronic device to redirect to the same-system frequency point of the first cell, and usually the failure probability of the electronic device accessing the same-system frequency point of the first cell is higher than the failure probability of accessing the inter-system frequency point of the first cell. Therefore, 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 inter-system neighbor cell is higher than the signal quality threshold. After receiving the target event, the first cell knows that the signal quality of the inter-system neighbor cell is relatively high, so it is very likely to instruct the electronic device to redirect or hand over to the inter-system neighbor cell in the follow-up.

[0036] In this application, when the signal quality of the first cell is low, the electronic device can report a target event to the first cell, so that the first cell instructs the electronic device to redirect or handover to the second cell. Since the second cell is an inter-system neighbor cell 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 during redirection or handover. In this case, compared with the electronic device accessing the same-system neighbor cell of the first cell, the success rate of the electronic device accessing the second cell is higher. In this way, it is possible to avoid the electronic device from being redirected repeatedly in a short period of time to a certain extent, and then it is possible to avoid problems such as service jamming or even interruption to a certain extent.

[0037] 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 policy may be: if it is measured that the signal quality of the first cell is lower than the signal quality threshold, then execute the fourth policy when the cell identifier of the first cell is the problem cell identifier and / or the frequency point of the first cell is the problem frequency point.

[0038] 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 policy may be: if it is measured that the signal quality of the first cell is lower than the signal quality threshold, then execute the fourth policy when all the policies in the first preset policy have been executed within the fifth preset time period before the current moment, and the first preset policy includes one or more of the first policy, the second policy, and the third policy.

[0039] In a fifth aspect, a cell access method is provided. In this method, the electronic device receives a redirection message sent by the first cell. Then, it accesses the cell corresponding to the redirection frequency point carried in the redirection message. If the access to the cell corresponding to the redirection frequency point fails, then when the redirection message is a blind redirection message, execute the fifth policy, and the fifth policy is: access a second cell, where the second cell is an inter-system neighbor cell of the first cell.

[0040] Since the redirection frequency point carried in the blind redirection message is directly specified by the first cell, then when the electronic device fails to access the cell corresponding to the redirection frequency point carried in the blind redirection message, it is reasonably suspected that there is likely such a problem in all the same-system neighbor cells of the first cell. For this reason, in this application, when the electronic device fails to access the cell corresponding to the redirection frequency point carried in the blind redirection message, it directly accesses the inter-system neighbor cell of the first cell, that is, the second cell.

[0041] After the electronic device accesses the second cell, on the one hand, it can, to a certain extent, avoid the problem of redirection again due to low cell signal quality. On the other hand, even if redirection is required subsequently, since the redirection frequency points indicated by the second cell are mostly different from those indicated by the first cell, the problem of the electronic device failing to access the cell corresponding to the redirection frequency point can be avoided to a certain extent. Thus, the electronic device can be prevented from being redirected repeatedly in a short period of time, and then the problems of service lag or even interruption can be avoided to a certain extent.

[0042] Optionally, the operation of the electronic device to access the cell corresponding to the redirection frequency point carried in the redirection message may be: if the cell identifier of the first cell is not the problem cell identifier and the frequency point of the first cell is not the problem frequency point, then access the cell corresponding to the redirection frequency point; if the cell identifier of the first cell is the problem cell identifier and / or the frequency point of the first cell is the problem frequency point, then when the redirection message is a measurement redirection message, access the cell corresponding to the redirection frequency point. Correspondingly, after the electronic device receives the redirection message sent by the first cell, if the cell identifier of the first cell is the problem cell identifier and / or the frequency point of the first cell is the problem frequency point, then when the redirection message is a blind redirection message, execute the fifth strategy.

[0043] Since the redirection frequency point carried in the measurement redirection message is determined by the first cell according to the relevant cell signal quality reported by the electronic device, the success rate of the electronic device accessing the cell corresponding to the redirection frequency point carried in the measurement redirection message is relatively high. Therefore, the electronic device can access the cell corresponding to the redirection frequency point carried in the redirection message when the redirection message is a measurement redirection message.

[0044] Since the redirection frequency band carried by the blind redirection message is directly specified by the first cell, when the cell identifier of the first cell is the problematic cell identifier and / or the frequency band of the first cell is the problematic frequency band, the success rate of the electronic device accessing the cell corresponding to the redirection frequency band carried by the blind redirection message is usually relatively low. Therefore, in this application, when the cell identifier of the first cell is the problematic cell identifier and / or the frequency band of the first cell is the problematic frequency band, and the redirection message is a blind redirection message, the electronic device does not access the cell corresponding to the redirection frequency band carried by the redirection message, but accesses the second cell. The second cell is an inter-system neighbor cell 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. At this time, when the electronic device is redirected, it actually falls back from the first cell to the second cell. In this case, compared with the electronic device accessing the cell corresponding to the redirection frequency band directly specified in the blind redirection message of the first cell, the success rate of the electronic device accessing the second cell is higher. In this way, it is possible to avoid the electronic device being redirected repeatedly in a short period of time to a certain extent, and then it is possible to avoid problems such as service jamming or even interruption to a certain extent.

[0045] Optionally, the operation of the electronic device accessing the cell corresponding to the redirection frequency band carried by the redirection message may be: if all the policies in the second preset policy have not been completed within the fifth preset duration before the current moment, then access the cell corresponding to the redirection frequency band. The second preset policy includes one or more of the first policy, the second policy, the third policy, and the fourth policy.

[0046] Correspondingly, after the electronic device receives the redirection message sent by the first cell, if all the policies in the second preset policy have been executed within the fifth preset duration before the current moment, then when the redirection message is a blind redirection message, execute the fifth policy.

[0047] In a sixth aspect, a cell access method is provided. In this method, when the electronic device accesses the target cell, if it 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, determine the fourth number of times. The fourth number of times is the number of times that the electronic device fails to access the cell corresponding to the redirection frequency band carried by the redirection message within the fourth preset duration before the current moment. The preset signal quality is the signal quality that can trigger blind redirection; if the fourth number of times is greater than or equal to the fourth number of times threshold, then execute the sixth policy. The sixth policy is: do not send an A2 event to the target cell.

[0048] When the signal quality of the target cell is lower than the preset signal quality, if the electronic device reports an A2 event, it is very likely to trigger the target cell to perform blind redirection. And the fourth number is greater than or equal to the fourth number threshold, indicating that the electronic device has tried to access the cell corresponding to the redirection frequency point carried in the redirection message multiple times before but all failed. In this case, if the electronic device reports an A2 event and triggers blind redirection, then the electronic device is very likely to still fail to access the cell corresponding to the redirection frequency point carried in the redirection message, which will cause obvious lags or even interruptions in the service. Therefore, in this case, the present application does not allow the electronic device to report the A2 event to avoid triggering blind redirection, so as to avoid the problem of obvious lags or even interruptions in the service to a certain extent. It should be noted that although the current signal quality of the target cell is not good, the electronic device can continue to perform services by continuing to access the target cell. Compared with the problem of obvious lags or even interruptions in the service caused by the electronic device being unable to access the cell for a period of time due to access failure after blind redirection, it is obvious that the electronic device continuing to access the target cell is more conducive to service performance.

[0049] 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 can be: if it is measured 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 cell identifier of the target cell is not the problem cell identifier, and the frequency point of the target cell is not the problem frequency point, determine the fourth number.

[0050] Correspondingly, 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, and the cell identifier of the target cell is the problem cell identifier and / or the frequency point of the target cell is the problem frequency point, execute the sixth strategy.

[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 can be: if it is measured 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, and all the strategies in the third preset strategy have been executed within the fifth preset time period before the current moment, determine the fourth number, 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.

[0052] In a seventh aspect, a chip system is provided. The chip system 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.

[0053] In an eighth aspect, a cell access device is provided, and the cell access device has a function of implementing the behaviors of 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.

[0054] In a ninth aspect, an electronic device is provided. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the above-mentioned cell access method is implemented.

[0055] In a tenth aspect, a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium, and when the instructions are run on a computer, the computer is caused to execute the above-mentioned cell access method.

[0056] In an eleventh aspect, a computer program product including instructions is provided. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned cell access method.

[0057] The technical effects obtained in the above seventh to eleventh aspects are similar to the technical effects obtained by the corresponding technical means in the above first to sixth aspects, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 FIG. is a schematic diagram of a communication system provided by an embodiment of the present application;

[0059] Figure 2 FIG. is a flowchart of a redirection process provided by an embodiment of the present application;

[0060] Figure 3 FIG. is a flowchart of a cell access method provided by an embodiment of the present application;

[0061] Figure 4 FIG. is a schematic diagram of a cell access process provided by an embodiment of the present application;

[0062] Figure 5 FIG. is a flowchart of another cell access method provided by an embodiment of the present application;

[0063] Figure 6 FIG. is a flowchart of another cell access method provided by an embodiment of the present application;

[0064] Figure 7 FIG. is a flowchart of another cell access method provided by an embodiment of the present application;

[0065] Figure 8 FIG. is a schematic diagram of another communication system provided by an embodiment of the present application;

[0066] Figure 9It is a schematic diagram of another cell access process provided by an embodiment of the present application;

[0067] Figure 10 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0068] Figure 11 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0069] Figure 12 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0070] Figure 13 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0071] Figure 14 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0072] Figure 15 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0073] Figure 16 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0074] Figure 17 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0075] Figure 18 It is a flowchart of another cell access method provided by an embodiment of the present application;

[0076] Figure 19 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

[0077] Figure 20 It is a software structure block diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0078] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe in detail the implementation manners of the present application in conjunction with the accompanying drawings.

[0079] 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. The "and / or" in this text is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to clearly describe the technical solution of this application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. 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 being different.

[0080] The statements such as "an embodiment" or "some embodiments" described in this application mean that the specific features, structures, or characteristics described in this embodiment are included in one or more embodiments of this application. Thus, the statements such as "in an embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" and the like that appear in different parts of this application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, the terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0081] The system architecture related to the embodiments of this application will be described below.

[0082] Figure 1 is a schematic diagram of a communication system provided by an embodiment of this application. Refer to Figure 1 This communication system may include an electronic device 100, a first cell 200, and a second cell 300.

[0083] The number of the first cells 200 can be one or more. The number of the second cells 300 can also be one or more.

[0084] The electronic device 100 is within the coverage of the first cell 200 and within the coverage of the second cell 300. The electronic device 100 can access one first cell 200 or one second cell 300.

[0085] The electronic device 100 may also be referred to as a UE. The electronic device 100 can support multiple mobile communication technology standards. For example, it can support the second-generation mobile communication technology (2th generation mobile networks, 2G) standard, the third-generation mobile communication technology (3th generation mobile networks, 3G) standard, the fourth-generation mobile communication technology (4th generation mobile networks, 4G) standard, the fifth-generation mobile communication technology (5th generation mobile networks, 5G) standard, etc. Among them, the 4G standard may also be referred to as the long term evolution (LTE) standard.

[0086] Exemplarily, 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, a vehicle-mounted 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, etc. The embodiments of the present application do not limit this.

[0087] The second cell 300 is an inter-system neighbor cell 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. And, 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, if the first cell 200 supports the 5G standard, in this case, the first cell 200 can be called a 5G cell; if the second cell 300 supports the 4G standard, in this case, the second cell 300 can be called a 4G cell. Another example, if the first cell 200 supports the 4G standard, in this case, the first cell 200 can be called a 4G cell; if the second cell 300 supports the 3G standard, in this case, the second cell 300 can be called a 3G cell. Optionally, a 5G cell may also be referred to as a new radio (NR) cell. A 4G cell may also be referred to as an LTE cell.

[0088] 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. The electronic device 100 communicating with this cell 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.

[0089] It should be noted that in the embodiments of the present application, the electronic device 100 can support the first mobile communication technology standard and the second mobile communication technology standard, and 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 that the electronic device 100 can support. Among them, in the embodiments of the present application, the network based on the first mobile communication technology standard is referred to as the first network, and the network based on the second mobile communication technology standard is referred to as the second network.

[0090] 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 referred to as the serving cell of the electronic device 100. Currently, when the signal quality of the electronic device 100 in the serving cell is lower than the threshold, the electronic device 100 can report an A2 event to the serving cell, expecting the serving cell to send an instruction for the electronic device 100 to switch to other cells. 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 the problem of failing to access the cell corresponding to the redirection frequency point carried in the redirection message.

[0091] Next, taking the serving cell as a 5G cell as an example, an exemplary description of the redirection process of the electronic device will be given.

[0092] Figure 2 is a flowchart of a redirection process provided by an embodiment of the present application. Refer to Figure 2 and this redirection process may include the following steps 201 to step 215.

[0093] Step 201: The electronic device accesses the 5G cell A.

[0094] When the electronic device is connected to 5G cell A, the electronic device is in the radio resource control (RRC) connected state. At this time, the electronic device camps on 5G cell A.

[0095] Step 202: 5G cell A sends a measurement configuration message to the electronic device.

[0096] Exemplarily, the measurement configuration message can be an RRC connection reconfiguration message carrying a measConfig information element.

[0097] 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. Exemplarily, the measurement configuration message can include A2 event information. The A2 event information can include the threshold of the A2 event. The A2 event is used to indicate that the signal quality of the serving cell is lower than the threshold.

[0098] After receiving the measurement configuration message sent by 5G cell A, the electronic device can measure the signal quality of 5G cell A.

[0099] Step 203: The electronic device performs service data transmission through 5G cell A.

[0100] Step 204: When the electronic device measures that the signal quality of 5G cell A is lower than the threshold, it reports the A2 event.

[0101] Exemplarily, when the electronic device measures that the signal quality of 5G cell A is lower than the threshold, it can send a measurement report (MR) message containing the A2 event to 5G cell A.

[0102] Step 205: 5G cell A sends a redirection message to the electronic device.

[0103] Exemplarily, the redirection message can be an RRC connection release message carrying a redirectedCarrierInfo information element. The redirectedCarrierInfo information element can include the redirected frequency point.

[0104] Step 206: The electronic device attempts to access the cell corresponding to the redirected frequency point carried in the redirection message, but the access fails, and it camps back on 5G cell A.

[0105] 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 is in the RRC idle state. Then, the electronic device searches for the cell corresponding to the redirection frequency point and attempts to access it. In some cases, the electronic device may fail to access due to the inability to find the cell corresponding to the redirection frequency point; of course, the electronic device may also fail to access due to other factors, which are not limited in the embodiments of the present application.

[0106] In the case where the electronic device fails to access the cell corresponding to the redirection frequency point, the electronic device will most likely camp back to the source cell, that is, camp back to 5G cell A.

[0107] Step 207: The electronic device initiates a service request process, triggering a random access procedure.

[0108] In some embodiments, when the electronic device is in the RRC idle state, if there is user data or signaling message to be sent, it can initiate a service request process. To implement the service request, the electronic device needs to access the cell, thus triggering a random access procedure. In the embodiments of the present application, this random access procedure refers to the electronic device accessing 5G cell A using a random access method (including but not limited to a contention-based random access method).

[0109] Exemplarily, this random access procedure may include the following steps 208 to 212:

[0110] Step 208: The electronic device sends a random access preamble to 5G cell A.

[0111] Exemplarily, the electronic device may carry the random access preamble in a MSG1 message and send it to 5G cell A.

[0112] Step 209: After receiving the random access preamble, 5G cell A sends a random access response message to the electronic device.

[0113] Exemplarily, this random access response message may also be referred to as a MSG2 message.

[0114] Step 210: After receiving the random access response message, the electronic device sends an RRC connection request message to 5G cell A.

[0115] Exemplarily, this RRC connection request message may also be referred to as a MSG3 message.

[0116] Step 211: After receiving the RRC connection request message, 5G cell A sends an RRC connection setup message to the electronic device.

[0117] Exemplarily, the RRC connection setup message can also be referred to as a MSG4 message.

[0118] Step 212: After receiving the RRC connection setup message, the electronic device sends an RRC connection setup complete message to 5G cell A.

[0119] Exemplarily, the RRC connection setup complete message contains a service request message of the non-access stratum (NAS) layer.

[0120] Step 213: After receiving the RRC connection setup complete message, 5G cell A sends a service accept message of the NAS layer to the electronic device.

[0121] 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 accept message to the electronic device through 5G cell A.

[0122] After receiving the service accept message, the electronic device can perform service data transmission through 5G cell A.

[0123] However, due to the relatively low signal quality of 5G cell A, steps 204 to 207 will be repeated. Specifically, when the signal quality of 5G cell A is lower than the threshold value, the electronic device still reports an A2 event. Then 5G cell A sends a redirection message to the electronic device. When the electronic device accesses the cell corresponding to the redirection frequency point carried in the redirection message, it is very likely to fail and then camp back to 5G cell A. Then the electronic device will initiate a service request process again, triggering a random access process. After that, due to the relatively low signal quality of 5G cell A, the above process will still be repeated and redirection will occur repeatedly.

[0124] Generally, after the electronic device repeatedly initiates a service request process within a short period of time, when the electronic device sends a service request message to 5G cell A again during the random access process, the core network will return a service reject message to the electronic device through 5G cell A.

[0125] Step 214: 5G cell A sends a service reject message to the electronic device.

[0126] Exemplarily, the rejection reason value carried in the service rejection message may be #10 implicitly detached.

[0127] Step 215: After receiving the service rejection message, the electronic device initiates an initial registration.

[0128] From the above Figure 2 As can be seen from the embodiments, the main problems existing in the above process are as follows: In step 206, the electronic device attempts to access the cell corresponding to the redirection frequency point carried in the redirection message, but the access fails. The failure of the electronic device to access will cause obvious lags in the service, and will cause subsequent repeated redirections of the electronic device, resulting in continuous lags in the service. Moreover, the repeated redirections of the electronic device will lead to repeated initiation of the service request process, and then cause the core network to send a service rejection message to the electronic device, which will cause service interruption, such as call drop during a call.

[0129] Therefore, the embodiments of the present application provide a cell access method to solve the above problems and avoid the occurrence of service lags or even interruptions to a certain extent.

[0130] The cell access method provided by the embodiments of the present application will be explained in detail below.

[0131] Figure 3 is a flowchart of a cell access method provided by the embodiments of the present application. Refer to Figure 3 The method includes the following steps:

[0132] Step 301: The electronic device accesses the target cell.

[0133] 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 above Figure 1 embodiments, and will not be elaborated in the embodiments of the present application.

[0134] When the electronic device accesses the target cell, the electronic device is in the RRC connected state. At this time, the electronic device camps on the target cell. The target cell is the current serving cell of the electronic device.

[0135] It should be noted that after the electronic device accesses the target cell, it can transmit service data through the target cell. For example, after the electronic device accesses the target cell, it can make a call, and call data can be transmitted through the target cell during the call. Or, after the electronic device accesses the target cell, it can browse the web, and web data can be transmitted through the target cell during web browsing.

[0136] Step 302: When the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, it sends an A2 event to the target cell.

[0137] After the electronic device accesses the target cell, the target cell may send a measurement configuration message to the electronic device, and the measurement configuration message is used to instruct the electronic device to measure the signal quality of the serving cell. After 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 when the signal quality of the target cell is lower than the signal quality threshold. For example, the electronic device may send a measurement report message containing the A2 event to the target cell.

[0138] Exemplarily, the measurement configuration message may be an RRC connection reconfiguration message carrying a measurement configuration cell. The measurement configuration cell may include A2 event information. The A2 event information may include a threshold value of the A2 event. The A2 event is used to indicate that the signal quality of the serving cell is lower than the threshold value.

[0139] The signal quality threshold may be set in advance. Optionally, the signal quality threshold may be the threshold value of the A2 event included in the measurement configuration message.

[0140] The signal quality of the cell may be characterized by one or more characteristics of the cell signal. For example, the signal quality of the cell may be the reference signal receiving power (RSRP) of the cell, or may be the reference signal received quality (RSRQ) of the cell, or may be the signal to interference plus noise ratio (SINR) of the cell, or may be the received signal strength indication (RSSI) of the cell. Of course, the signal quality of the cell may also be jointly characterized by two or more of the cell's RSRP, RSRQ, SINR, and RSSI. The embodiments of the present application do not limit this.

[0141] Step 303: The target cell sends a redirection message to the electronic device.

[0142] Exemplarily, the redirection message may be an RRC connection release message carrying a redirection frequency cell. The redirection frequency cell may include a redirection frequency.

[0143] Optionally, the redirection frequency may be a same-system frequency of the target cell, or may be a different-system frequency of the target cell. For example, if the target cell is a 5G cell, then the redirection frequency may be a 5G frequency or a 4G frequency.

[0144] It should be noted that redirection is generally divided into blind redirection and measurement redirection.

[0145] In some embodiments, after the target cell receives the A2 event sent by the electronic device, it can directly specify a redirection frequency point, and then directly send a redirection message carrying this redirection frequency point to the electronic device to instruct the electronic device to switch to the cell corresponding to this redirection frequency point. This redirection process is a blind redirection process.

[0146] In other embodiments, after the target cell receives the A2 event sent by the electronic device, it first sends a measurement configuration message to the electronic device to instruct the electronic device to measure the signal quality of the cells corresponding to the relevant frequency points and report it. After the target cell receives the reported cell signal quality from the electronic device, it determines a redirection frequency point accordingly, and then sends a redirection message carrying this redirection frequency point to the electronic device to instruct the electronic device to switch to the cell corresponding to this redirection frequency point. This redirection process is a measurement redirection process.

[0147] Step 304: After the electronic device receives the redirection message, it accesses the cell corresponding to the redirection frequency point carried in the redirection message.

[0148] After the electronic device receives the redirection message, it releases the RRC connection with the target cell. After the RRC connection is released, the electronic device is in the RRC idle state. Then, the electronic device searches for the cell corresponding to the redirection frequency point and attempts to access it.

[0149] In some embodiments, if the electronic device fails to search for the cell corresponding to the redirection frequency point, it can be determined that the access to the cell corresponding to the redirection frequency point fails. In blind redirection, the target cell will directly specify a redirection frequency point. In this case, there may be no cell corresponding to this redirection frequency point near the electronic device, resulting in the failure of the electronic device to access the cell corresponding to this redirection frequency point.

[0150] Of course, the electronic device may also fail to access the cell corresponding to the redirection frequency point due to other factors, and the embodiments of the present application do not limit this.

[0151] Step 305: If the electronic device fails to access the cell corresponding to the redirection frequency point, determine the first number. When the first number is greater than or equal to the first number threshold, execute the first strategy. The first strategy is: access a cell other than the target cell.

[0152] The first number is the number of times that the access to the cell corresponding to the redirection frequency point indicated by the target cell fails within the first preset duration before the current moment. Among them, the first preset duration can be set in advance. For example, the first preset duration can be 2 seconds, 3 seconds, etc., and the embodiments of the present application do not limit this.

[0153] It should be noted that the "first count" 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 point carried in this redirection message, the electronic device determines that a redirection failure has occurred once, which can be counted into the first count corresponding to the target cell. That is to say, even if the electronic device searches for multiple cells corresponding to the redirection frequency point carried in this redirection message, but fails to access all of these multiple cells, then the electronic device also determines that a redirection failure has occurred once.

[0154] The first count threshold can be set in advance. For example, the first count threshold can be 2, 3, etc., and the embodiments of the present application do not limit this.

[0155] In some embodiments, after the electronic device determines the first count, if the first count is less than the first count threshold, the electronic device accesses a cell. In this case, the electronic device can perform cell search, and select a suitable cell from the searched cells to camp on and access. The cell accessed at this time may be the target cell or may not be the target cell.

[0156] If the first count is greater than or equal to the first count threshold, it indicates that the electronic device has repeatedly attempted to access the cell corresponding to the redirection frequency point indicated by the target cell but failed in a short period of time. In this case, it is reasonably suspected that this problem is very likely caused by the target cell. Therefore, in the embodiments of the present application, after the electronic device fails to access the cell corresponding to the redirection frequency point, when the first count is greater than or equal to the first count threshold, it will prohibit returning to the target cell, that is, it will access a cell other than the target cell. This cell can be a same-system neighbor cell of the target cell or a different-system neighbor cell of 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.

[0157] Exemplarily, after the electronic device fails to access the cell corresponding to the redirection frequency point, when the first count is greater than or equal to the first count threshold, it will prohibit the target cell during the cell selection process or the cell reselection process, so as to select a cell other than the target cell to camp on and access.

[0158] After the electronic device accesses a cell other than the target cell, on the one hand, it can, to a certain extent, avoid the problem of redirection again due to low cell signal quality; on the other hand, even if redirection is required subsequently, since the redirection frequency points indicated by this cell other than the target cell are mostly different from those indicated by the target cell, the problem of the electronic device failing to access the cell corresponding to the redirection frequency point can be avoided to a certain extent. Thus, the electronic device can be prevented from repeatedly redirecting within a short period of time, and then the problem of service freezing or even interruption can be avoided to a certain extent.

[0159] In some embodiments, in step 305, the electronic device may use a random access method (including but not limited to a competitive random access method) to access a cell other than the target cell. Next, a possible implementation manner for the electronic device to access this cell will be described by way of example in combination with Figure 4 A possible implementation manner for the electronic device to access this cell will be described by way of example.

[0160] Figure 4 FIG. is a schematic diagram of a cell access process provided by an embodiment of the present application. Refer to Figure 4 This cell access process may include the following steps 401 to 408.

[0161] Step 401: The electronic device camps on a cell other than the target cell.

[0162] After the electronic device performs cell search, if it searches for a cell other than the target cell and determines to access this cell, the electronic device may first camp on this cell and then access this cell.

[0163] Step 402: The electronic device initiates a service request procedure, triggering a random access process.

[0164] In some embodiments, when the electronic device is in the RRC idle state, if there is user data or signaling message to be sent, it may initiate a service request procedure. To implement the service request, the electronic device needs to access this cell, thus triggering a random access process.

[0165] Exemplarily, this random access process may include the following steps 403 to 408:

[0166] Step 403: The electronic device sends a random access prefix to this cell.

[0167] Exemplarily, the electronic device may carry this random access prefix in a MSG1 message and send it to this cell.

[0168] Step 404: After receiving this random access prefix, this cell sends a random access response message to the electronic device.

[0169] Exemplarily, this random access response message may also be referred to as an MSG2 message.

[0170] Step 405: After receiving this random access response message, the electronic device sends an RRC connection request message to this cell.

[0171] Exemplarily, this RRC connection request message may also be referred to as an MSG3 message.

[0172] Step 406: After receiving this RRC connection request message, this cell sends an RRC connection setup message to the electronic device.

[0173] Exemplarily, this RRC connection setup message may also be referred to as an MSG4 message.

[0174] Step 407: After receiving this RRC connection setup message, the electronic device sends an RRC connection setup complete message to this cell.

[0175] Exemplarily, this RRC connection setup complete message contains a service request message at the NAS layer.

[0176] Step 408: After receiving this RRC connection setup complete message, this cell sends a service acceptance message at the NAS layer to the electronic device.

[0177] In some embodiments, after receiving this service request message, this cell may send this service request message to the core network. After receiving this service request message, the core network performs relevant processing, and then may send a service acceptance message to the electronic device through this cell.

[0178] After receiving this service acceptance message, the electronic device can perform service data transmission through this cell.

[0179] It should be noted that the embodiments of the present application only use the above Figure 4 embodiments as examples to exemplarily illustrate the process of the electronic device accessing a cell other than the target cell. The above Figure 4 embodiments do not limit the embodiments of the present application. The electronic device may also access a cell other than the target cell through other methods different from the above Figure 4 embodiments, and the embodiments of the present application do not limit this.

[0180] 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.

[0181] 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.

[0182] 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 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.

[0183] In an embodiment of the present application, after the electronic device receives the redirection message sent by the target cell, if the access to the cell corresponding to the redirection frequency carried by the redirection message fails, the first number can be determined, and the first number is the number of failures to access the cell corresponding to the redirection frequency indicated by the target cell within the 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 tried to access the cell corresponding to the redirection frequency indicated by the target cell in a short period of time and failed. In this case, the electronic device accesses a cell other than the target cell. In this way, the subsequent redirection can be avoided to a certain extent, and even if the 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. In this way, the electronic device can be avoided to a certain extent from being repeatedly redirected in a short period of time, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0184] Figure 5 is a flow chart of a cell access method provided by an embodiment of the present application. Figure 5 , the method comprises the following steps:

[0185] Step 501: The electronic device accesses the target cell.

[0186] The operation of step 501 is similar to that of step 301 in the above Figure 3 embodiment, and details thereof are not described herein again in the embodiments of the present application.

[0187] 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.

[0188] The operation of step 502 is similar to that of step 302 in the above Figure 3 embodiment, and details thereof are not described herein again in the embodiments of the present application.

[0189] Step 503: The target cell sends a redirection message to the electronic device.

[0190] The operation of step 503 is similar to that of step 303 in the above Figure 3 embodiment, and details thereof are not described herein again in the embodiments of the present application.

[0191] Step 504: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency carried in the redirection message.

[0192] The operation of step 504 is similar to that of step 304 in the above Figure 3 embodiment, and details thereof are not described herein again in the embodiments of the present application.

[0193] Step 505: If the electronic device fails to access the cell corresponding to the redirection frequency, determine a second number of times. When the second number of times is greater than or equal to the second number threshold, execute a second strategy. 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.

[0194] The second number of times is the number of times that the electronic device fails to access the cell corresponding to the redirection frequency indicated by the cell corresponding to the target frequency within a second preset duration before the current moment. The second preset duration can be set in advance. For example, the second preset duration can be 2 seconds, 3 seconds, 4 seconds, etc., and the embodiments of the present application do not limit this.

[0195] It should be noted that the "second count" 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 a target frequency band sends a redirection message to the electronic device, if the electronic device fails to successfully access the cell corresponding to the redirection frequency band carried in this redirection message, the electronic device determines that a redirection failure has occurred once, which can be counted into the second count corresponding to the target frequency band. That is to say, even if the electronic device searches for multiple cells corresponding to the redirection frequency band carried in this redirection message, but fails to access all of these cells, the electronic device also determines that a redirection failure has occurred once.

[0196] The second count threshold can be set in advance. For example, the second count threshold can be 2, 3, 4, etc., and the embodiments of the present application do not limit this.

[0197] In some embodiments, after the electronic device determines the second count, if the second count is less than the second count threshold, the electronic device accesses a cell. In this case, the electronic device can perform cell search, and select a suitable cell from the searched cells to camp on and access. The cell accessed at this time may be the cell corresponding to the target frequency band, or may not be the cell corresponding to the target frequency band.

[0198] If the second count is greater than or equal to the second count threshold, it means that the electronic device has repeatedly attempted to access the cell corresponding to the redirection frequency band indicated by the cell corresponding to the target frequency band within a short period of time and failed. In this case, it is reasonably suspected that there is likely a problem with all the cells corresponding to the target frequency band. Therefore, in the embodiments of the present application, after the electronic device fails to access the cell corresponding to the redirection frequency band, when the second count is greater than or equal to the second count threshold, it will prohibit returning to the target frequency band, that is, it will access a cell corresponding to a frequency band other than the target frequency band. This cell can be a co-system neighbor cell of the target cell or an inter-system neighbor cell of 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.

[0199] Exemplarily, after the electronic device fails to access the cell corresponding to the redirection frequency band, when the second count is greater than or equal to the second count threshold, it will prohibit the target frequency band during the cell selection process or the cell reselection process, so as to select a cell corresponding to a frequency band other than the target frequency band to camp on and access.

[0200] After the electronic device accesses a cell corresponding to a frequency point other than the target frequency point, on the one hand, it can, to a certain extent, avoid the problem of redirection again due to low cell signal quality; on the other hand, even if redirection is required subsequently, since the redirection frequency point indicated by this cell corresponding to the frequency point other than the target frequency point is likely to be different from the redirection frequency point indicated by the cell corresponding to the target frequency point, it can, to a certain extent, avoid the problem of the electronic device failing to access the cell corresponding to the redirection frequency point. Thus, it can, to a certain extent, avoid the electronic device from repeatedly redirecting within a short period of time, and then can, to a certain extent, avoid the problems of service jamming or even interruption.

[0201] In some embodiments, in step 505, the electronic device may use a random access method (including but not limited to a competitive random access method) to access a cell corresponding to a frequency point other than the target frequency point. Optionally, a possible implementation manner for the electronic device to access this cell may refer to the manner described in the foregoing Figure 4 embodiment, and the embodiments of the present application will not elaborate on this again.

[0202] In some embodiments, in step 505, if the electronic device fails to access the cell corresponding to the redirection frequency point, the electronic device may further determine whether the cell identifier of the target cell is a problematic cell identifier. If the cell identifier of the target cell is not a problematic cell identifier, the electronic device may determine a second number, and execute a second policy to access a cell corresponding to a frequency point other than the target frequency point when the second number is greater than or equal to a second number threshold. If the cell identifier of the target cell is a problematic cell identifier, the electronic device does not need to determine the second number and may directly execute the second policy to access a cell corresponding to a frequency point other than the target frequency point.

[0203] In some embodiments, after the electronic device determines the second number, when the second number is greater than or equal to the second number threshold, it may also record the target frequency point as a problematic frequency point. The electronic device may record one or more problematic frequency points. The electronic device will try not to select the cell corresponding to the problematic frequency point during the cell selection process and the cell reselection process, and will also try not to report the cell corresponding to the problematic frequency point during cell reporting, so as to try to avoid accessing the cell corresponding to the problematic frequency point.

[0204] In some cases, the electronic device may still access the cell corresponding to the problematic frequency point. For example, assume that the current serving cell of the electronic device is the target cell, then the target cell may be the cell corresponding to the problematic frequency point previously recorded by the electronic device.

[0205] 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 redirected frequency band carried in the redirection message, the electronic device can determine a second number when it determines that the frequency band of the target cell (i.e., the target frequency band) is not the recorded problematic frequency band. When the second number is greater than or equal to the second number threshold, the electronic device then executes a second strategy to access a cell corresponding to a frequency band other than the target frequency band; while when the electronic device determines that the target frequency band is the recorded problematic frequency band, it does not need to determine the second number and can directly execute the second strategy to access a cell corresponding to a frequency band other than the target frequency band.

[0206] In the embodiment of the present application, after the electronic device receives the redirection message sent by the target cell, if it fails to access the cell corresponding to the redirected frequency band carried in the redirection message, it can determine a second number. The second number is the number of times of failing to access the cell corresponding to the redirected frequency band indicated by the cell corresponding to the target frequency band within a second preset duration before the current moment, and the target frequency band is the frequency band of the target cell. If the second number is greater than or equal to the second number threshold, it means that the electronic device has repeatedly tried to access the cell corresponding to the redirected frequency band indicated by the cell corresponding to the target frequency band and failed within a short period of time. In this case, the electronic device accesses a cell corresponding to a frequency band other than the target frequency band. In this way, it can avoid subsequent redirection to a certain extent, and even if redirection occurs subsequently, it can also avoid the problem that the electronic device fails to access the cell corresponding to the redirected frequency band to a certain extent. Thus, it can avoid the electronic device from being repeatedly redirected within 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.

[0207] Figure 6 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 6 and the method includes the following steps:

[0208] Step 601: The electronic device accesses the target cell.

[0209] The operation of step 601 is similar to that of step 301 in the above Figure 3 embodiment, and the embodiment of the present application will not elaborate on this.

[0210] 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.

[0211] The operation of step 602 is similar to that of step 302 in the above Figure 3 embodiment, and the embodiment of the present application will not elaborate on this.

[0212] Step 603: The target cell sends a redirection message to the electronic device.

[0213] The operation in step 603 is similar to the operation in step 303 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0214] Step 604: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency point carried in the redirection message.

[0215] The operation in step 604 is similar to the operation in step 304 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0216] Step 605: If the electronic device fails to access the cell corresponding to the redirection frequency point, determine a third number of times. When the third number of times is greater than or equal to a third number-of-times threshold, execute a third strategy. The third strategy is: access a cell, and after accessing this cell, send target information to this cell. 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 redirection frequency point is located.

[0217] The third number of times is the number of times that the electronic device fails to access the cell corresponding to the redirection frequency point within a third preset duration before the current moment. The third preset duration can be set in advance. For example, the third preset duration can be 1 day, 2 days, 1 month, 2 months, etc., and the embodiments of the present application do not limit this.

[0218] It should be noted that the "third number of times" described in the embodiments of the present application is determined based on the redirection message and is used to indicate the number of times of redirection failure. That is, after a cell sends a redirection message to the electronic device, if the electronic device fails to successfully access the cell corresponding to a certain redirection frequency point carried in this redirection message, the electronic device determines that a redirection failure occurs once, and it can be counted into the third number of times corresponding to this redirection frequency point. That is to say, even if the electronic device searches for multiple cells corresponding to this redirection frequency point carried in this redirection message, but fails to access all of these cells, then the electronic device also determines that a redirection failure occurs once.

[0219] The third number-of-times threshold can be set in advance. For example, the third number-of-times threshold can be 2, 3, 4, 5, 6, etc., and the embodiments of the present application do not limit this.

[0220] In some embodiments, after the electronic device determines the third number of times, if the third number of times is less than the third number-of-times threshold, the electronic device accesses a cell. In this case, the electronic device can perform cell search, and select a suitable cell from the searched cells to camp on and access.

[0221] If the third number is greater than or equal to the third number threshold, it indicates that the electronic device has previously tried to access the cell corresponding to the redirected frequency point multiple times but failed. In this case, it is reasonably suspected that there is a problem with the frequency band where the redirected frequency point is located (i.e., the specified frequency band). Therefore, in the embodiments of the present application, after the electronic device fails to access the cell corresponding to the redirected frequency point and 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 specified frequency band, this cell can learn that the electronic device does not support the specified frequency band after receiving the target information. Then, when redirection is required subsequently, the redirected frequency point indicated by this cell is likely not a frequency point within the specified frequency band, thus the problem of the electronic device failing to access the cell corresponding to the redirected frequency point can be avoided to a certain extent. This can avoid the electronic device from being redirected repeatedly in a short period of time to a certain extent, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0222] It should be noted that although the electronic device in the embodiments of the present application sends target information to this cell to indicate that it does not support the specified frequency band, this is to avoid this cell redirecting the electronic device to the specified frequency band subsequently, and it does not mean that the electronic device really does not support the specified frequency band. That is to say, even if the electronic device supports the specified frequency band, in the above situation, it will still send target information to this cell so that this cell thinks that the electronic device does not support the specified frequency band.

[0223] Exemplarily, after the electronic device fails to access the cell corresponding to the redirected frequency point and the third number is greater than or equal to the third number threshold, it can perform cell search, and then can select a suitable cell from the searched cells to camp on and access, and can send target information to this cell after accessing.

[0224] It should be noted that the cell accessed by the electronic device can be the target cell or not, and the embodiments of the present application do not limit this.

[0225] In some embodiments, in step 605, the electronic device can use a random access method (including but not limited to a competitive random access method) to access this cell. Optionally, a possible implementation manner for the electronic device to access this cell can refer to the manner described in the above Figure 4 embodiment, and the embodiments of the present application will not elaborate on this.

[0226] In some embodiments, the target information may be UE capability information. In this case, the operation of the electronic device to send the target information to this cell after accessing this cell may be as follows: after the electronic device accesses this cell, it first sends a mobility registration updating (MRU) message to this cell to indicate that the UE capability information needs to be updated; after this cell receives the MRU message, it sends a UE capability enquiry message to the electronic device; after the electronic device receives the UE capability enquiry message, it sends the UE capability information to this cell, and the UE capability information is used to indicate that the electronic device does not support the specified frequency band.

[0227] In the embodiments of the present application, the electronic device can actively trigger the MRU process after accessing this cell, so that this cell queries the UE capability information. In this way, the electronic device can report the UE capability information to this cell to indicate that it does not support the specified frequency band.

[0228] Of course, after the electronic device accesses this cell, it can also send the target information to this cell by other means, and the embodiments of the present application do not limit this.

[0229] In some embodiments, in step 605, if the electronic device fails to access the cell corresponding to the redirected frequency point, the electronic device can further determine whether the cell identifier of the target cell is a problematic cell identifier, and determine whether the frequency point of the target cell is a problematic frequency point. If the cell identifier of the target cell is not a problematic cell identifier and the frequency point of the target cell is not a problematic frequency point, the electronic device can determine the third number of times, and execute the third strategy when the third number of times is greater than or equal to the third number threshold. If the cell identifier of the target cell is a problematic cell identifier and / or the frequency point of the target cell is a problematic frequency point, the electronic device does not need to determine the third number of times and can directly execute the third strategy.

[0230] In an embodiment of the present application, after the electronic device receives a redirection message sent by the target cell, if it fails to access the cell corresponding to the redirection frequency band carried in the redirection message, the third number of times can be determined. The third number of times is the number of times of failing to access the cell corresponding to the redirection frequency band within the third preset duration before the current moment. If the third number of times is greater than or equal to the third number threshold, it indicates that the electronic device has previously tried to access the cell corresponding to the redirection frequency band multiple times but all failed. In this case, the electronic device first accesses a cell, and then sends target information to this cell after accessing this cell to indicate that the electronic device does not support the specified frequency band where the redirection frequency band is located. In this way, even if redirection occurs subsequently, the problem of the electronic device failing to access the cell corresponding to the redirection frequency band can be avoided to a certain extent. Thus, the electronic device can be prevented from repeatedly redirecting within a short time to a certain extent, and then the problem of service jamming or even interruption can be avoided to a certain extent.

[0231] Figure 7 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 7 , the method includes the following steps:

[0232] Step 701: The electronic device accesses the first cell.

[0233] The operation of step 701 is similar to the operation of step 301 in the above Figure 3 embodiment, and this embodiment of the present application will not elaborate on it.

[0234] Step 702: When the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, execute the fourth strategy. 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 inter-system neighbor cell is higher than the signal quality threshold.

[0235] Exemplarily, the target event can 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 the inter-system neighbor cell is higher than the threshold value. The B2 event is used to indicate that the signal quality of the serving cell is lower than threshold value 1, and the signal quality of the inter-system neighbor cell is higher than threshold value 2. Threshold value 1 and threshold value 2 can be the same or different. Optionally, the threshold values in the B1 event and the B2 event can be configured by the network side (including the access network and the core network).

[0236] The signal quality threshold can be set in advance. Exemplarily, the signal quality threshold can be the threshold value of the A2 event.

[0237] 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 an A2 event to the first cell. However, in the related art, after receiving the A2 event, the first cell is likely to instruct the electronic device to redirect to the same-system frequency point of the first cell, and usually the failure probability of the electronic device accessing the same-system frequency point of the first cell is higher than that of accessing the different-system frequency point 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 a target event to indicate that the signal quality of the different-system neighbor cell is higher than the signal quality threshold. After receiving the target event, the first cell learns that the signal quality of the different-system neighbor cell is relatively high, and then will very likely instruct the electronic device to redirect or handover to the different-system neighbor cell in the subsequent process.

[0238] It can be understood that in the embodiments of the present application, the triggering of the target event has the following two situations:

[0239] The first situation is that the target event is normally triggered according to the signal quality of the different-system neighbor cell and its threshold value. That is, when the electronic device measures that the signal quality of the different-system neighbor cell is higher than the threshold value, it normally triggers a B1 event and reports the B1 event to the serving cell; or, when the electronic device measures that the signal quality of the serving cell is lower than threshold value 1 and the signal quality of the different-system neighbor cell is higher than threshold value 2, it normally triggers a B2 event and reports the B2 event to the serving cell.

[0240] The second situation is that the target event is triggered in the manner of step 702 above. That is, if the electronic device measures that the signal quality of the serving cell is lower than the signal quality threshold, regardless of the magnitude relationship between the signal quality of the current different-system neighbor cell and its threshold value, it directly triggers a B1 event or a B2 event and reports the B1 event or the B2 event to the serving cell.

[0241] In some embodiments, in step 702, when the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it can also determine whether the cell identifier of the first cell is a problematic cell identifier and determine whether the frequency point of the first cell is a problematic frequency point. If the cell identifier of the first cell is not a problematic cell identifier and the frequency point of the first cell is not a problematic frequency point, the electronic device can send an A2 event to the first cell. And if the cell identifier of the first cell is a problematic cell identifier and / or the frequency point of the first cell is a problematic frequency point, the electronic device can execute a fourth strategy to send a target event to the first cell.

[0242] Step 703: The first cell sends a redirection message or a handover command to the electronic device.

[0243] This redirection message is used to indicate redirection to the cell corresponding to the redirection frequency point. The redirection frequency point carried in this redirection message is the frequency point of the second cell, and the second cell is a different-system neighbor cell of the first cell.

[0244] Exemplarily, the redirection message may be an RRC connection release message carrying a redirection frequency point cell. The redirection frequency point included in the redirection frequency point cell is an inter-system frequency point of the first cell, that is, the frequency point of the second cell. For example, if the first cell is a 5G cell, then the redirection frequency point may be a 4G frequency point.

[0245] It should be noted that redirection is generally divided into blind redirection and measurement redirection.

[0246] In some embodiments, after the first cell receives the target event sent by the electronic device, it may directly specify an inter-system frequency point as the redirection frequency point, and then directly send a redirection message carrying this redirection frequency point to the electronic device to instruct the electronic device to switch to the cell corresponding to this redirection frequency point. This redirection process is a blind redirection process.

[0247] In other embodiments, after the first cell receives the target event sent by the electronic device, it first sends a measurement configuration message to the electronic device to instruct the electronic device to measure the signal quality of the cell corresponding to the relevant inter-system frequency point and report it. After the first cell receives the cell signal quality reported by the electronic device, it determines an inter-system frequency point as the redirection frequency point accordingly, and then sends a redirection message carrying this redirection frequency point to the electronic device to instruct the electronic device to switch to the cell corresponding to this redirection frequency point. This redirection process is a measurement redirection process.

[0248] The handover command is used to instruct a handover to a second cell. For example, if the first cell is a 5G cell, then the handover command may instruct a handover to a 4G cell.

[0249] Exemplarily, the handover command may be an RRC connection reconfiguration message carrying a mobilityControlInfo cell.

[0250] Optionally, the handover command may include radio parameters required when switching to the second cell, such as the PCI of the second cell to be switched to, radio bearer (RB) configuration information, etc.

[0251] The RB configuration information is configuration information related to the RB. For example, the RB configuration information may include configuration information related to signalling radio bearer (SRB) 1, SRB2, and data radio bearer (DRB).

[0252] Among them, the SRB is the channel for actual transmission of signaling messages. SRB1 is used to carry RRC messages and can also carry some NAS messages. SRB2 is used to carry NAS messages. Among them, the DRB is the channel for actual transmission of user data.

[0253] Step 704: If the electronic device receives the redirection message, it accesses a second cell corresponding to the redirection frequency point carried in the redirection message; if the electronic device receives the handover command, it accesses a second cell indicated by the handover command.

[0254] 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 is in the RRC idle state. Then, the electronic device searches for a second cell corresponding to the redirection frequency point, and selects a second cell from the searched second cells to camp on and access.

[0255] Optionally, after receiving the handover command, the electronic device can camp on and access a second cell according to the radio parameters included in the handover command.

[0256] In the embodiments of the present application, when the signal quality of the electronic device in the first cell is low, the electronic device can report a target event to the first cell, so that the first cell instructs the electronic device to redirect or handover to the second cell. Since the second cell is an inter-system neighbor cell 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 to the second cell when redirecting or handing over. In this case, compared with the electronic device accessing an intra-system neighbor cell of the first cell, the success rate of the electronic device accessing the second cell is higher. In this way, it is possible to avoid the electronic device from repeatedly redirecting in a short period of time to a certain extent, and then it is possible to avoid problems such as service jamming or even interruption to a certain extent.

[0257] In some embodiments, when the electronic device accesses a second cell corresponding to the redirection frequency point carried in the redirection message, the electronic device can use a random access method (including but not limited to a competitive random access method) to access this second cell. Optionally, a possible implementation manner for the electronic device to access this second cell can refer to the manner described in the above Figure 4 embodiment, and the embodiments of the present application will not elaborate on this.

[0258] In some embodiments, when the electronic device accesses a second cell indicated by the handover command, it can use a random access method (including but not limited to a non-competitive random access method) to access a second cell according to the radio parameters included in the handover command. Next, in combination with Figure 8 and Figure 9An exemplary implementation of the electronic device accessing this second cell is described.

[0259] As an example, as Figure 8 shown, the communication system in the embodiments 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.

[0260] The access network is responsible for using a certain wired or wireless connection and communication technology to converge a large number of end users level by level into the core network to achieve connection to the network. The access network is the edge part of the entire network, the part closest to the user, and is usually also called the "last mile".

[0261] Exemplarily, the access network of a 5G network includes 5G cells, and the base stations of 5G cells (i.e., gNBs) can be referred to as access network devices in the 5G network. Exemplarily, the access network of a 4G network includes 4G cells, and the base stations of 4G cells (i.e., eNBs) can be referred to as access network devices in the 4G network.

[0262] The main functions of the core network are to provide user connections, user management, and bearer for services, and to provide an interface to external networks as a bearer network. The establishment of user connections includes functions such as mobility management (MM), call management (CM), switching / routing, and announcement recording (combining intelligent network services to complete the connection relationship to intelligent network peripheral devices).

[0263] Exemplarily, the core network of a 5G network is 5G Core (which can be abbreviated as 5GC). 5GC can use general network function virtualization devices to replace the dedicated communication devices of the 4G network. Exemplarily, the core network of a 4G network is the evolved packet core (EPC). EPC has the traditional capabilities of mobile networks such as user subscription data storage, mobility management, and data exchange, and can provide users with an ultra-high-speed Internet experience.

[0264] In the embodiments of the present application, the first cell belongs to the access network of the first network, and the base station of the first cell is an access network device in the first network. Exemplarily, it is assumed that the first cell is a 5G cell. When the electronic device camps on the 5G cell, the electronic device communicates with the gNB of the 5G cell, and the gNB communicates with 5GC.

[0265] 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. Exemplarily, it is assumed that the second cell is a 4G cell. When the electronic device camps on the 4G cell, the electronic device communicates with the eNB of the 4G cell, and the eNB communicates with EPC.

[0266] In some embodiments, the process of the electronic device accessing a second cell indicated by the handover command involves the interaction among the electronic device, the access network device of the second network (i.e., the base station of the second cell), and the core network of the second network.

[0267] Assume that the electronic device accesses the second cell by using a non-competitive random access method. Then, the handover command sent by the first cell to the electronic device may further include a non-conflicting random access preamble assigned to the electronic device. In this case, the handover command may also be referred to as a MSG0 message.

[0268] In this case, assume that the second cell is a 4G cell. Then, the process of the electronic device accessing a 4G cell indicated by the handover command involves the interaction among the electronic device, the eNB of the 4G cell, and the EPC, as specifically described in the following Figure 9 embodiment.

[0269] Figure 9 is a schematic diagram of a cell access process provided by an embodiment of the present application. Refer to Figure 9 , the cell access process may include the following steps 901 to 908.

[0270] Step 901: The electronic device sends a random access preamble to the eNB of the 4G cell.

[0271] Exemplarily, the electronic device may camp on the 4G cell according to the cell identifier of the 4G cell included in the handover command, and send the random access preamble assigned in the handover command to the eNB of the 4G cell.

[0272] Exemplarily, the electronic device may carry the random access preamble in a MSG1 message and send it to the eNB.

[0273] Step 902: After receiving the random access preamble, the eNB sends a random access response message to the electronic device.

[0274] Exemplarily, the random access response message may also be referred to as a MSG2 message.

[0275] It should be noted that after the cell where the electronic device camps changes, the electronic device will find that the tracking area (TA) or TA list where it is located changes. Among them, one TA list contains multiple TAs.

[0276] After the electronic device receives the random access response message sent by the eNB, it has actually accessed the 4G cell. However, since the cell where the electronic device camps 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 the EPC) of the TA it is currently in. Therefore, after receiving the random access response message, the electronic device will also execute the following steps 903 to 908 to perform TAU.

[0277] Step 903: After the electronic device receives the random access response message, it sends a radio resource control (RRC) connection reconfiguration complete message to the eNB. The RRC connection reconfiguration complete message contains a TAU request message at the NAS layer.

[0278] In some embodiments, after the electronic device receives the handover command, it can first configure the relevant radio bearers (RBs) according to the RB configuration information in the handover command. For example, it can configure SRB1, SRB2, and DRB. In this case, in step 903, the electronic device can send the RRC connection reconfiguration complete message to the eNB through SRB1.

[0279] Exemplarily, the TAU request message may include the tracking area identity (TAI) of the TA where the electronic device is currently located.

[0280] Step 904: After the eNB receives the RRC connection reconfiguration complete message, it sends an initial UE message to the EPC. The initial UE message contains the TAU request message.

[0281] Step 905: After the EPC receives the initial UE message, it sends a downlink NAS transport message to the eNB. The downlink NAS transport message contains a TAU accept message at the NAS layer.

[0282] Optionally, after the EPC receives the initial UE message, if it determines that the electronic device is accessing for the first time, the EPC can authenticate the electronic device (authentication / security) to create some security-related parameters for the electronic device.

[0283] Optionally, after the EPC receives the initial UE message, it can update the TA or TA list of the electronic device. After the update, it will send a downlink NAS transport message containing the TAU accept message to the eNB.

[0284] Step 906: After receiving the downlink NAS transport message, the eNB sends a downlink information transfer message to the electronic device, and the TAU acceptance message is included in the downlink information transfer message.

[0285] Step 907: After receiving the downlink information transfer message, the electronic device sends an uplink information transfer message to the eNB, and the TAU complete message at the NAS layer is included in the uplink information transfer message.

[0286] Optionally, the electronic device may send the uplink information transfer message to the eNB through SRB2.

[0287] Step 908: After receiving the uplink information transfer message, the eNB sends an uplink NAS transport message to the EPC, and the TAU complete message is included in the uplink NAS transport message.

[0288] After the EPC receives the TAU complete message, the TAU procedure is completed.

[0289] So far, the electronic device has completed the cell access procedure and the related TAU procedure. After the electronic device accesses the 4G cell, it can perform service data transmission through the 4G cell.

[0290] It should be noted that the embodiments of the present application only use the above Figure 9 embodiments as examples to exemplarily illustrate the process of the electronic device accessing a second cell indicated by the handover command. The above Figure 9 embodiments do not limit the embodiments of the present application. The electronic device may also access a second cell indicated by the handover command in other ways different from the above Figure 9 embodiments, and the embodiments of the present application do not limit this.

[0291] In an embodiment of the present application, when an electronic device is connected to a first cell, if the signal quality of the first cell is measured to be lower than the signal quality threshold, the electronic device sends a target event to the first cell. The target event is used to indicate that the signal quality of an inter-system neighbor cell is higher than the signal quality threshold. After that, the electronic device receives a redirection message or a handover command sent by the first cell. The redirection frequency band carried by the redirection message is the frequency band of a second cell, and the handover command instructs to hand over to a second cell. After that, the electronic device can connect to a second cell corresponding to the redirection frequency band, or connect to a second cell indicated by the handover command. Since the success rate of the electronic device connecting to the second cell is relatively high, it can, to a certain extent, prevent the electronic device from being repeatedly redirected in a short period of time, and thus can, to a certain extent, avoid problems such as service jamming or even interruption.

[0292] Figure 10 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 10 , the method includes the following steps:

[0293] Step 1001: The electronic device connects to a first cell.

[0294] The operation of step 1001 is similar to the operation of step 301 in the above Figure 3 embodiment, and this embodiment of the present application will not elaborate on it.

[0295] 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.

[0296] The operation of step 1002 is similar to the operation of step 302 in the above Figure 3 embodiment, and this embodiment of the present application will not elaborate on it.

[0297] Step 1003: The first cell sends a redirection message to the electronic device.

[0298] The operation of step 1003 is similar to the operation of step 303 in the above Figure 3 embodiment, and this embodiment of the present application will not elaborate on it.

[0299] Step 1004: After receiving the redirection message, the electronic device connects to the cell corresponding to the redirection frequency band carried by the redirection message.

[0300] The operation of step 1004 is similar to the operation of step 304 in the above Figure 3 embodiment, and this embodiment of the present application will not elaborate on it.

[0301] In some embodiments, in step 1004, after receiving the redirection message, the electronic device can directly connect to the cell corresponding to the redirection frequency band carried by the redirection message.

[0302] In some other embodiments, after receiving the redirection message in step 1004, the electronic device may further determine whether the cell identifier of the first cell is a problematic cell identifier and whether the frequency point of the first cell is a problematic frequency point. If the cell identifier of the first cell is not a problematic cell identifier and the frequency point of the first cell is not a problematic frequency point, the electronic device may access the cell corresponding to the redirection frequency point carried in the redirection message. If the cell identifier of the first cell is a problematic cell identifier and / or the frequency point of the first cell is a problematic frequency point, 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 point carried in 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 point carried in the redirection message, but executes a fifth strategy, and the fifth strategy is: access a second cell, where the second cell is an inter-system neighbor cell of the first cell.

[0303] As an example, if the electronic device sends an A2 event to the first cell and then receives a measurement configuration message sent by the first cell, and then measures the signal quality of relevant cells and reports it to the first cell, and then receives the redirection message sent by the first cell, then the redirection message is a measurement redirection message. If the electronic device sends an A2 event to the first cell and receives the redirection message sent by the first cell without measuring and reporting the signal quality of relevant cells, then the redirection message is a blind redirection message.

[0304] Since the redirection frequency point carried in the measurement redirection message is determined by the first cell according to the signal quality of relevant cells reported by the electronic device, the success rate of the electronic device accessing the cell corresponding to the redirection frequency point carried in the measurement redirection message is relatively high. Therefore, the electronic device may access the cell corresponding to the redirection frequency point carried in the redirection message when the redirection message is a measurement redirection message.

[0305] Since the redirection frequency band carried by the blind redirection message is directly specified by the first cell, when the cell identifier of the first cell is the problematic cell identifier and / or the frequency band of the first cell is the problematic frequency band, the success rate of the electronic device accessing the cell corresponding to the redirection frequency band carried by the blind redirection message is usually relatively low. Therefore, in the embodiments of the present application, when the cell identifier of the first cell is the problematic cell identifier and / or the frequency band of the first cell is the problematic frequency band, and the redirection message is a blind redirection message, the electronic device does not access the cell corresponding to the redirection frequency band carried by the redirection message, but accesses the second cell. The second cell is an inter-system neighbor cell 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. At this time, when the electronic device is redirected, it actually falls back from the first cell to the second cell. In this case, compared with the electronic device accessing the cell corresponding to the redirection frequency band directly specified in the blind redirection message of the first cell, the success rate of the electronic device accessing the second cell is higher. In this way, it is possible to avoid, to a certain extent, the electronic device being repeatedly redirected in a short period of time, and then it is possible to avoid, to a certain extent, the problems of service jamming or even interruption.

[0306] In some embodiments, the electronic device may use a random access method (including but not limited to a competitive random access method) to access the second cell. Optionally, a possible implementation manner for the electronic device to access the second cell may refer to the manner described in the foregoing Figure 4 embodiment, and the embodiments of the present application will not elaborate on this.

[0307] Step 1005: If the electronic device fails to access the cell corresponding to the redirection frequency band, it executes the fifth policy when the redirection message is a blind redirection message. The fifth policy is: access a second cell.

[0308] After the electronic device fails to access the cell corresponding to the redirection frequency band, if the redirection message is a measurement redirection message, the electronic device accesses a cell. In this case, the electronic device can perform cell search, and select a suitable cell from the searched cells to camp on and access. The cell accessed at this time may be the first cell or the second cell.

[0309] After the electronic device fails to access the cell corresponding to the redirection frequency band, if the redirection message is a blind redirection message, the electronic device accesses a second cell.

[0310] Since the redirection frequency band carried in the blind redirection message is directly specified by the first cell, in the case where the electronic device fails to access the cell corresponding to the redirection frequency band carried in the blind redirection message, it is reasonably suspected that most likely all the same-system neighboring cells of the first cell have this problem. Therefore, in the embodiments of the present application, when the electronic device fails to access the cell corresponding to the redirection frequency band carried in the blind redirection message, it directly accesses a different-system neighboring cell of the first cell, that is, the second cell.

[0311] After the electronic device accesses the second cell, on the one hand, it can, to a certain extent, avoid the problem of redirection again due to low cell signal quality; on the other hand, even if redirection is required subsequently, since the redirection frequency band indicated by the second cell is most likely different from the redirection frequency band indicated by the first cell, it can, to a certain extent, avoid the problem that the electronic device fails to access the cell corresponding to the redirection frequency band. Thus, it can, to a certain extent, avoid the electronic device from being redirected repeatedly in a short period of time, and then it can, to a certain extent, avoid the problem of service jamming or even interruption.

[0312] In some embodiments, the electronic device may use a random access method (including but not limited to a competitive random access method) to access the second cell. Optionally, a possible implementation manner for the electronic device to access the second cell may refer to the manner described in the above Figure 4 embodiment, and the embodiments of the present application will not elaborate on this again.

[0313] In the embodiments of the present application, after the electronic device receives a redirection message sent by the first cell, it accesses the cell corresponding to the redirection frequency band carried in the redirection message. If the electronic device fails to access the cell corresponding to the redirection frequency band, when the redirection message is a blind redirection message, the electronic device accesses a second cell. In this way, it can, to a certain extent, avoid subsequent redirection again, and moreover, even if redirection occurs subsequently, it can, to a certain extent, avoid the problem that the electronic device fails to access the cell corresponding to the redirection frequency band. Thus, it can, to a certain extent, avoid the electronic device from being redirected repeatedly in a short period of time, and then it can, to a certain extent, avoid the problem of service jamming or even interruption.

[0314] Figure 11 is a flowchart of a cell access method provided by the embodiments of the present application. Refer to Figure 11 , the method includes the following steps:

[0315] Step 1101: The electronic device accesses the target cell.

[0316] The operation of step 1101 is similar to the operation of step 301 in the above Figure 3 embodiment, and the embodiments of the present application will not elaborate on this again.

[0317] Step 1102: If the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and the signal quality threshold of the target cell is lower than the preset signal quality, determine the fourth count.

[0318] 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; while if the signal quality threshold of the target cell is lower than the preset signal quality, it is necessary to first determine the fourth count and then determine whether to send an A2 event to the target cell based on this.

[0319] The fourth count is the number of times of failure to access the cell corresponding to the redirected frequency band carried in the access redirection message within the fourth preset duration before the current moment. The fourth preset duration can be set in advance. For example, the fourth preset duration can be 1 day, 2 days, 1 month, etc., and the embodiments of the present application do not limit this.

[0320] It should be noted that the "fourth count" 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 the electronic device, if the electronic device fails to successfully access the cell corresponding to the redirected frequency band carried in this redirection message, the electronic device determines that a redirection failure occurs and can count it into the fourth count. That is to say, even if the electronic device searches for multiple cells corresponding to the redirected frequency band carried in this redirection message, but fails to access all of these cells, the electronic device also determines that a redirection failure occurs.

[0321] Exemplarily, the signal quality threshold can be the threshold value of the A2 event. The threshold value of the A2 event is generally configured by the network side, and the network side may configure one or more threshold values for the A2 event. The electronic device will trigger the A2 event when it measures that the signal quality of the target cell is lower than any threshold value.

[0322] When the electronic device measures that the signal quality of the target cell is lower than the corresponding threshold value, it can report an A2 event carrying the signal quality of the target cell to the target cell. After receiving this A2 event, the target cell can perform measurement-based redirection or blind redirection.

[0323] Generally, when the signal quality of the target cell carried in this A2 event is relatively high, the target cell will perform measurement-based redirection; while when the signal quality of the target cell carried in this A2 event is relatively low, the target cell will perform blind redirection.

[0324] The preset signal quality can be set in advance. The preset signal quality is the signal quality that has a high probability of triggering the target cell to perform blind redirection. That is, when the signal quality of the target cell carried in the A2 event is lower than the preset signal quality, it is very likely that the target cell will perform blind redirection after receiving the A2 event.

[0325] For example, the network side configures three threshold values for the A2 event, which are, from largest to smallest: threshold value 1, threshold value 2, and threshold value 3.

[0326] If the electronic device measures that the signal quality of the target cell is lower than threshold value 1 and higher than or equal to threshold value 2, it can send an A2 event carrying the signal quality of the target cell to the target cell. After receiving the A2 event, the target cell can instruct the electronic device to perform inter-frequency measurement. Then, the target cell can instruct the electronic device to redirect to a co-system neighbor cell of the target cell according to the signal quality of the cell measured by the electronic device. This process is measurement redirection.

[0327] If the electronic device measures that the signal quality of the target cell is lower than threshold value 2 and higher than or equal to threshold value 3, it can send an A2 event carrying the signal quality of the target cell to the target cell. After receiving the A2 event, the target cell can instruct the electronic device to perform inter-system measurement. Then, the target cell can instruct the electronic device to redirect to an inter-system neighbor cell of the target cell according to the signal quality of the cell measured by the electronic device. This process is measurement redirection.

[0328] If the electronic device measures that the signal quality of the target cell is lower than threshold value 3, it can send an A2 event carrying the signal quality of the target cell to the target cell. After receiving the A2 event, the target cell can directly use a specified frequency point as the redirection frequency point, and then instruct the electronic device to redirect to the cell corresponding to this specified frequency point. This process is blind redirection.

[0329] In this case, the preset signal quality can be lower than threshold value 2 and higher than or equal to threshold value 3.

[0330] 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 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 performs the following step 1103.

[0331] Among them, the fourth number threshold can be set in advance. For example, the fourth number threshold can be 4, 5, 6, etc., and the embodiments of the present application do not limit this.

[0332] Step 1103: If the fourth number is greater than or equal to the fourth number threshold, the electronic device executes the sixth strategy, and the sixth strategy is: not sending an A2 event to the target cell.

[0333] When the signal quality of the target cell is lower than the preset signal quality, if the electronic device reports an A2 event, it is very likely to trigger the target cell to perform blind redirection. And the fourth number is greater than or equal to the fourth number threshold, indicating that the electronic device has previously tried to access the cell corresponding to the redirection frequency point carried in the redirection message multiple times but failed. In this case, if the electronic device reports an A2 event and triggers blind redirection, then the electronic device is very likely to still fail to access the cell corresponding to the redirection frequency point carried in the redirection message, which will cause obvious lags or even interruptions in the service. Therefore, in this case, the embodiment of the present application does not allow the electronic device to report an A2 event to avoid triggering blind redirection, so as to avoid the problem of obvious lags or even interruptions in the service to a certain extent. It should be noted that although the current signal quality of the target cell is not good, the electronic device can continue the service by continuing to access the target cell. Compared with the problem of obvious lags or even interruptions in the service caused by the electronic device being unable to access the cell for a period of time due to access failure after blind redirection, it is obvious that the electronic device continuing to access the target cell is more conducive to the service.

[0334] 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 point of the target cell is a problem frequency point; if 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, the electronic device can determine the fourth number, and execute the sixth strategy, that is, not to send an A2 event to the target cell only when the fourth number is greater than or equal to the fourth number threshold; and if the cell identifier of the target cell is a problem cell identifier and / or the frequency point of the target cell is a problem frequency point, the electronic device does not need to determine the fourth number and can directly execute the sixth strategy, that is, not to send an A2 event to the target cell.

[0335] In the embodiment of the present application, after the electronic device accesses the target cell, if it 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, it determines the fourth number. The fourth number is the number of times the electronic device fails to access the cell corresponding to the redirection frequency point carried in the redirection message within the fourth preset duration before the current moment. When the fourth number is greater than or equal to the fourth number threshold, the electronic device executes the sixth strategy, that is, not to send an A2 event to the target cell to avoid triggering blind redirection. In this way, the problem of obvious lags or even interruptions in the service can be avoided to a certain extent.

[0336] The above text Figure 3 Embodiments to Figure 11The first strategy, second strategy, third strategy, fourth strategy, fifth strategy, and sixth strategy provided by the embodiments are all to solve the problem of business jamming or even interruption. In some embodiments, these six strategies can be flexibly combined to a greater extent to avoid the problem of business jamming or even interruption.

[0337] Generally, the modifications of the first strategy, second strategy, third strategy, fourth strategy, fifth strategy, and sixth strategy to the original process increase in turn, and correspondingly, the probability of successfully solving the problem is higher.

[0338] It is understandable that there can be multiple combinations of these six strategies. For example, pairwise combinations can be made, 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, the fifth strategy + the sixth strategy. Three - strategy combinations can also be made, such as: 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 - strategy combinations can also be made, such as: the first strategy + the second strategy + the third strategy + the fourth strategy, the first strategy + the second strategy + the third strategy + the fifth strategy, the first strategy + the second strategy + the third strategy + the sixth strategy, the first strategy + the second strategy + the fourth strategy + the fifth strategy, the first strategy + the second strategy + the fourth strategy + the sixth strategy, the first strategy + the second strategy + the fifth strategy + the sixth strategy, the first strategy + the third strategy + the fourth strategy + the fifth strategy, the first strategy + the third strategy + the fourth strategy + the sixth strategy, the first strategy + the third strategy + the fifth strategy + the sixth strategy, the first strategy + the fourth strategy + the fifth strategy + the sixth strategy, the second strategy + the third strategy + the fourth strategy + the fifth strategy, the second strategy + the third strategy + the fourth strategy + the sixth strategy, the second strategy + the third strategy + the fifth strategy + the sixth strategy, the second strategy + the fourth strategy + the fifth strategy + the sixth strategy, the third strategy + the fourth strategy + the fifth strategy + the sixth strategy. Five - strategy combinations can also be made, such as: the first strategy + the second strategy + the third strategy + the fourth strategy + the fifth strategy, the first strategy + the second strategy + the third strategy + the fourth strategy + the sixth strategy, the first strategy + the second strategy + the third strategy + the fifth strategy + the sixth strategy, the first strategy + the second strategy + the fourth strategy + the fifth strategy + the sixth strategy, the first strategy + the third strategy + the fourth strategy + the fifth strategy + the sixth strategy, the second strategy + the third strategy + the fourth strategy + the fifth strategy + the sixth strategy.Six strategies can also be combined: the first strategy + the second strategy + the third strategy + the fourth strategy + the fifth strategy + the sixth strategy.

[0339] In some embodiments, when each of the above combination methods is executed, the previous strategy is executed first to solve the problem, and the subsequent strategy is executed when the problem still occurs after the previous strategy is executed. A detailed description will be given below.

[0340] Next, Figure 3 embodiments and Figure 5 a possible combination method of the embodiments will be explained in detail.

[0341] Figure 12 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 12 , the method includes the following steps:

[0342] Step 1201: The electronic device accesses the target cell.

[0343] The operation of step 1201 is similar to the operation of step 301 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0344] 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.

[0345] The operation of step 1202 is similar to the operation of step 302 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0346] Step 1203: The target cell sends a redirection message to the electronic device.

[0347] The operation of step 1203 is similar to the operation of step 303 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0348] Step 1204: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency point carried by the redirection message.

[0349] The operation of step 1204 is similar to the operation of step 304 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0350] Step 1205: If the electronic device fails to access the cell corresponding to the redirection frequency point, the electronic device determines whether the first strategy has been executed within the fifth preset duration before the current moment. If not, step 1206 is executed; if so, step 1207 is executed.

[0351] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., and the embodiments of the present application do not limit this.

[0352] Step 1206: If the electronic device has not executed the first policy within the fifth preset duration before the current moment, determine the first count, and execute the first policy when the first count is greater than or equal to the first count threshold. The first policy is: access a cell other than the target cell.

[0353] The operation of step 1206 is similar to the operation of step 305 in the above Figure 3 embodiment, and the embodiments of the present application will not elaborate on this.

[0354] Step 1207: If the electronic device has executed the first policy within the fifth preset duration before the current moment, determine the second count, and execute the second policy when the second count is greater than or equal to the second count threshold. The second policy is: access a cell corresponding to a frequency point other than the target frequency point, where the target frequency point is the frequency point of the target cell.

[0355] The operation of step 1206 is similar to the operation of step 505 in the above Figure 5 embodiment, and the embodiments of the present application will not elaborate on this.

[0356] In the embodiments of the present application, when the electronic device encounters the problem of failure to access the cell corresponding to the redirected frequency point, it will first adopt the first policy in an attempt to solve this problem. If this problem occurs again after executing the first policy, then the second policy will be adopted in an attempt to solve this problem. Generally speaking, compared with the first policy, the second policy has a higher probability of successfully solving this problem.

[0357] The above Figure 12 technical effects obtained by the embodiments are similar to the technical effects obtained by the corresponding technical means in the above Figure 3 embodiments and Figure 5 embodiments, and the embodiments of the present application will not elaborate on this.

[0358] Next, a possible combination manner of the above Figure 3 embodiments and Figure 6 embodiments will be explained in detail.

[0359] Figure 13 It is a flowchart of a cell access method provided by the embodiments of the present application. Refer to Figure 13 and the method includes the following steps:

[0360] Step 1301: The electronic device accesses the target cell.

[0361] The operation of step 1301 is similar to the operation of the above Figure 3The operation of step 301 in the embodiments is similar, and the embodiments of the present application will not elaborate on this again.

[0362] 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.

[0363] The operation of step 1302 is similar to that of Figure 3 step 302 in the above embodiments, and the embodiments of the present application will not elaborate on this again.

[0364] Step 1303: The target cell sends a redirection message to the electronic device.

[0365] The operation of step 1303 is similar to that of Figure 3 step 303 in the above embodiments, and the embodiments of the present application will not elaborate on this again.

[0366] Step 1304: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency point carried in the redirection message.

[0367] The operation of step 1304 is similar to that of Figure 3 step 304 in the above embodiments, and the embodiments of the present application will not elaborate on this again.

[0368] Step 1305: If the electronic device fails to access the cell corresponding to the redirection frequency point, the electronic device determines whether the first policy has been executed within the fifth preset duration before the current moment. If not, step 1306 is executed; if so, step 1307 is executed.

[0369] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., and the embodiments of the present application do not limit this.

[0370] Step 1306: If the electronic device has not executed the first policy within the fifth preset duration before the current moment, a first count is determined, and the first policy is executed when the first count is greater than or equal to the first count threshold. The first policy is: access a cell other than the target cell.

[0371] The operation of step 1306 is similar to that of Figure 3 step 305 in the above embodiments, and the embodiments of the present application will not elaborate on this again.

[0372] Step 1307: If the electronic device has executed the first policy within the fifth preset duration before the current moment, a third count is determined, and the third policy is executed when the third count is greater than or equal to the third count threshold. The third policy is: access a cell, and send target information to this cell after accessing this 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 redirection frequency point is located.

[0373] The operation in step 1306 is similar to that in step 605 in the above Figure 6 embodiment, and thus will not be elaborated in this embodiment of the present application.

[0374] In the embodiment of the present application, when the electronic device fails to access the cell corresponding to the redirected frequency point, it will first adopt the first strategy to solve this problem. If this problem occurs again after executing the first strategy, then the third strategy will be adopted to solve this problem. Generally, compared with the first strategy, the third strategy has a higher probability of successfully solving this problem.

[0375] above Figure 13 The technical effects obtained in the above Figure 3 embodiment and Figure 6 the corresponding technical means in the embodiment are approximately the same, and thus will not be elaborated in this embodiment of the present application.

[0376] Next, a possible combination of the above Figure 5 embodiment and Figure 6 embodiment will be explained in detail.

[0377] Figure 14 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 14 , the method includes the following steps:

[0378] Step 1401: The electronic device accesses the target cell.

[0379] The operation in step 1401 is similar to that in step 501 in the above Figure 5 embodiment, and thus will not be elaborated in this embodiment of the present application.

[0380] 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.

[0381] The operation in step 1402 is similar to that in step 502 in the above Figure 5 embodiment, and thus will not be elaborated in this embodiment of the present application.

[0382] Step 1403: The target cell sends a redirection message to the electronic device.

[0383] The operation in step 1403 is similar to that in step 503 in the above Figure 5 embodiment, and thus will not be elaborated in this embodiment of the present application.

[0384] Step 1404: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirected frequency point carried by the redirection message.

[0385] The operation of step 1404 is similar to that of step 504 in the above Figure 5 embodiment, and the embodiments of the present application will not repeat it here.

[0386] Step 1405: If the electronic device fails to access the cell corresponding to the redirected frequency point, the electronic device determines whether the second policy has been executed within the fifth preset duration before the current moment. If not, step 1406 is executed; if so, step 1407 is executed.

[0387] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., and the embodiments of the present application do not limit this.

[0388] Step 1406: If the electronic device has not executed the second policy within the fifth preset duration before the current moment, determine the second number of times. When the second number of times is greater than or equal to the second number threshold, execute the second policy. The second policy is: access a cell corresponding to a frequency point other than the target frequency point, and the target frequency point is the frequency point of the target cell.

[0389] The operation of step 1406 is similar to that of step 505 in the above Figure 5 embodiment, and the embodiments of the present application will not repeat it here.

[0390] Step 1407: If the electronic device has executed the second policy within the fifth preset duration before the current moment, determine the third number of times. When the third number of times is greater than or equal to the third number threshold, execute the third policy. The third policy is: access a cell, and after accessing this cell, send target information to this 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.

[0391] The operation of step 1406 is similar to that of step 605 in the above Figure 6 embodiment, and the embodiments of the present application will not repeat it here.

[0392] In the embodiments of the present application, when the electronic device encounters the problem of failing to access the cell corresponding to the redirected frequency point, it will first adopt the second policy in order to solve this problem. If this problem occurs again after executing the second policy, then the third policy will be adopted in order to solve this problem. Generally speaking, compared with the second policy, the third policy has a higher probability of successfully solving this problem.

[0393] The above Figure 14 technical effects obtained by the embodiments are similar to those obtained by the corresponding technical means in the above Figure 5 embodiment and Figure 6 embodiment, and the embodiments of the present application will not repeat it here.

[0394] Next, for the aboveFigure 3 Embodiments, Figure 5 embodiments and Figure 6 a possible combination manner of embodiments will be explained in detail.

[0395] Figure 15 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 15 , the method includes the following steps:

[0396] Step 1501: The electronic device accesses the target cell.

[0397] The operation of step 1501 is similar to the operation of step 301 in the above Figure 3 embodiment, and the embodiments of the present application will not repeat it here.

[0398] Step 1502: When the electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, it sends an A2 event to the target cell.

[0399] The operation of step 1502 is similar to the operation of step 302 in the above Figure 3 embodiment, and the embodiments of the present application will not repeat it here.

[0400] Step 1503: The target cell sends a redirection message to the electronic device.

[0401] The operation of step 1503 is similar to the operation of step 303 in the above Figure 3 embodiment, and the embodiments of the present application will not repeat it here.

[0402] Step 1504: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency point carried in the redirection message.

[0403] The operation of step 1504 is similar to the operation of step 304 in the above Figure 3 embodiment, and the embodiments of the present application will not repeat it here.

[0404] Step 1505: If the electronic device fails to access the cell corresponding to the redirection frequency point, the electronic device determines whether the first policy has been executed within the fifth preset duration before the current moment. If not, step 1506 is executed; if so, step 1507 is executed.

[0405] The fifth preset duration can be set in advance. For example, the fifth preset duration can be 1 day, 2 days, etc., and the embodiments of the present application do not limit this.

[0406] Step 1506: If the electronic device has not executed the first policy within the fifth preset duration before the current moment, determine the first count. If the first count is greater than or equal to the first count threshold, execute the first policy, where the first policy is: access a cell other than the target cell.

[0407] The operation of step 1506 is similar to that of step 305 in the above Figure 3 embodiment, and details are not described herein again in the embodiments of the present application.

[0408] Step 1507: If the electronic device has executed the first policy within the fifth preset duration before the current moment, the electronic device determines whether the second policy has been executed within the fifth preset duration before the current moment. If not, execute step 1508; if so, execute step 1509.

[0409] Step 1508: If the electronic device has not executed the second policy within the fifth preset duration before the current moment, determine the second count. If the second count is greater than or equal to the second count threshold, execute the second policy, where the second policy is: access a cell corresponding to a frequency point other than the target frequency point, and the target frequency point is the frequency point of the target cell.

[0410] The operation of step 1508 is similar to that of step 505 in the above Figure 5 embodiment, and details are not described herein again in the embodiments of the present application.

[0411] Step 1509: If the electronic device has executed the second policy within the fifth preset duration before the current moment, determine the third count. If the third count is greater than or equal to the third count threshold, execute the third policy, where the third policy is: access a cell, and after accessing this cell, send target information to this cell, and 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.

[0412] The operation of step 1509 is similar to that of step 605 in the above Figure 6 embodiment, and details are not described herein again in the embodiments of the present application.

[0413] In the embodiments of the present application, when the electronic device encounters the problem of failure to access the cell corresponding to the redirected frequency point, it will first adopt the first policy to try to solve this problem. If this problem occurs again after executing the first policy, then the second policy will be adopted to try to solve this problem. If this problem still occurs after executing the second policy, then the third policy will be adopted to try to solve this problem. Generally, the probabilities of the first policy, the second policy, and the third policy successfully solving this problem increase in sequence.

[0414] The above Figure 15 technical effects obtained by the embodiments are the same as those in the above Figure 3 embodiments, the aboveFigure 5 Examples and Figure 6 The technical effects obtained by the corresponding technical means in the examples are similar, and the embodiments of the present application will not repeat them here.

[0415] Next, one or more of the above Figure 3 Examples, Figure 5 Examples, Figure 6 One or more of the examples and a possible combination with the above Figure 7 Examples will be explained in detail.

[0416] Figure 16 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 16 , the method includes the following steps:

[0417] Step 1601: The electronic device accesses the first cell.

[0418] The operation of step 1601 is similar to the operation of step 701 in the above Figure 7 Examples, and the embodiments of the present application will not repeat them here.

[0419] Step 1602: The electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, and determines whether all the strategies in the first preset strategy have been executed within the fifth preset duration before the current moment. If not, steps 1603 to 1605 are executed. If so, steps 1606 to 1608 are executed.

[0420] The first preset strategy can be set in advance. The first preset strategy is a strategy executed by the electronic device after failing to access the cell corresponding to the redirection frequency point carried in the access redirection message. The first preset strategy is a strategy for solving the problems of service jamming and even interruption. The first preset strategy may include one or more of the first strategy, the second strategy, and the third strategy.

[0421] It should be noted that if the electronic device has not executed any of the strategies in the first preset strategy, or has only executed some of the strategies in the first preset strategy, within the fifth preset duration before the current moment, it can be determined that the electronic device has not executed all the strategies in the first preset strategy within the fifth preset duration before the current moment.

[0422] Step 1603: If the electronic device has not executed all the strategies in the first preset strategy within the fifth preset duration before the current moment, the electronic device sends an A2 event to the first cell.

[0423] The operation of step 1603 is similar to the operation of step 302 in the above Figure 3 Examples, and the embodiments of the present application will not repeat them here.

[0424] Step 1604: The first cell sends a redirection message to the electronic device.

[0425] The operation of step 1604 is similar to that of step 303 in the foregoing Figure 3 embodiment, and the embodiments of the present application will not elaborate on this.

[0426] Step 1605: After receiving the redirection message, the electronic device accesses the cell corresponding to the redirection frequency point carried in the redirection message.

[0427] The operation of step 1605 is similar to that of step 304 in the foregoing Figure 3 embodiment, and the embodiments of the present application will not elaborate on this.

[0428] It should be noted that in some embodiments, if the electronic device fails to access the cell corresponding to the redirection frequency point carried in the redirection message, it may continue to perform relevant operations according to the Figure 3 embodiment, Figure 5 embodiment, Figure 6 embodiment, Figure 13 embodiment, Figure 14 embodiment, or Figure 15 embodiment.

[0429] Step 1606: If the electronic device has executed all the policies in the first preset policy within the fifth preset duration before the current moment, the electronic device executes the fourth policy, and the fourth policy is: sending a target event to the first cell, where the target event is used to indicate that the signal quality of the inter-system neighbor cell is higher than the signal quality threshold.

[0430] If the electronic device has executed all the policies in the first preset policy within the fifth preset duration before the current moment, it indicates that the probability of the electronic device having a problem of failing to access the cell corresponding to the redirection frequency point is relatively 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.

[0431] The operation of step 1606 is similar to that of step 702 in the foregoing Figure 7 embodiment, and the embodiments of the present application will not elaborate on this.

[0432] Step 1607: The first cell sends a redirection message or a handover command to the electronic device. The redirection frequency point carried in the redirection message is the frequency point of the second cell, and the handover command is used to indicate a handover to a second cell, where the second cell is an inter-system neighbor cell of the first cell.

[0433] The operation of step 1607 is similar to that of step 703 in the foregoing Figure 7 embodiment, and the embodiments of the present application will not elaborate on this.

[0434] Step 1608: If the electronic device receives the redirection message, it accesses a second cell corresponding to the redirection frequency band carried in the redirection message; if the electronic device receives the handover command, it accesses a second cell indicated by the handover command.

[0435] The operation of Step 1608 is similar to the operation of Step 704 in the foregoing Figure 7 embodiment, and details are not described herein again in the embodiments of the present application.

[0436] The foregoing Figure 16 The technical effects obtained in the embodiments are similar to the technical effects obtained by the corresponding technical means in the foregoing embodiments, and details are not described herein again in the embodiments of the present application.

[0437] Next, a possible combination of one or more of the foregoing Figure 3 embodiments, Figure 5 embodiments, Figure 6 embodiments, Figure 7 embodiments and the foregoing Figure 10 embodiment will be explained in detail.

[0438] Figure 17 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 17 , the method includes the following steps:

[0439] Step 1701: The electronic device accesses a first cell.

[0440] The operation of Step 1701 is similar to the operation of Step 1001 in the foregoing Figure 10 embodiment, and details are not described herein again in the embodiments of the present application.

[0441] Step 1702: When the electronic device measures that the signal quality of the first cell is lower than the signal quality threshold, it sends an A2 event to the first cell or executes a fourth policy. The fourth policy is: sending a target event to the first cell, where the target event is used to indicate that the signal quality of the inter-system neighbor cell is higher than the signal quality threshold.

[0442] 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 policy.

[0443] 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 policy in the manner of Steps 1602, 1603, and 1606 in the foregoing Figure 16 embodiment.

[0444] Step 1703: The first cell sends a redirection message to the electronic device.

[0445] The operation of step 1703 is similar to that of step 1003 in the above Figure 10 embodiment, and details are not described herein again in the embodiments of the present application.

[0446] Step 1704: After receiving the redirection message, when the redirection message is a blind redirection message, the electronic device determines whether all the policies in the second preset policy have been executed within a fifth preset duration before the current moment. If not, step 1705 is executed; if so, step 1706 is executed.

[0447] The second preset policy can be set in advance. The second preset policy is a policy for solving the problems of service jamming or even interruption. The second preset policy may include one or more of a first policy, a second policy, a third policy, and a fourth policy.

[0448] It should be noted that if the electronic device has not executed any of the policies in the second preset policy or has only executed some of the policies in the second preset policy within the fifth preset duration before the current moment, it can be determined that the electronic device has not executed all the policies in the second preset policy within the fifth preset duration before the current moment.

[0449] It should be noted that after receiving the redirection message, when the redirection message is a measurement redirection message, the electronic device can access the cell corresponding to the redirection frequency point carried in the redirection message.

[0450] Step 1705: If the electronic device has not executed all the policies in the second preset policy within the fifth preset duration before the current moment, the electronic device accesses the cell corresponding to the redirection frequency point carried in the redirection message.

[0451] The operation of step 1705 is similar to that of step 1004 in the above Figure 10 embodiment, and details are not described herein again in the embodiments of the present application.

[0452] It should be noted that if the electronic device fails to access the cell corresponding to the redirection frequency point carried in the redirection message, it can also perform related operations according to Figure 10 the steps in the embodiment of step 1005.

[0453] Step 1706: If the electronic device has executed all the policies in the second preset policy within the fifth preset duration before the current moment, the electronic device executes a fifth policy, and the fifth policy is: accessing a second cell, where the second cell is an inter-system neighbor cell of the first cell.

[0454] The operation of step 1706 is similar to that of step 1005 in the above Figure 10 embodiment, and details are not described herein again in the embodiments of the present application.

[0455] above Figure 17 The technical effects obtained in the embodiments are similar to those obtained by the corresponding technical means in the foregoing embodiments, and the embodiments of the present application will not elaborate on this

[0456] Next, a detailed explanation will be given to one or more of the following Figure 3 embodiment, Figure 5 embodiment, Figure 6 embodiment, Figure 7 embodiment, Figure 10 embodiment and a possible combination with the following Figure 11 embodiment

[0457] Figure 18 is a flowchart of a cell access method provided by an embodiment of the present application. Refer to Figure 18 , the method includes the following steps:

[0458] Step 1801: The electronic device accesses the target cell.

[0459] The operation of step 1801 is similar to that of step 1101 in the foregoing Figure 11 embodiment, and the embodiments of the present application will not elaborate on this

[0460] Step 1802: The electronic device measures that the signal quality of the target cell is lower than the signal quality threshold, and the signal quality of the target cell is lower than the preset signal quality, then it is determined whether all the strategies in the third preset strategy have been executed within the fifth preset duration before the current moment. If not, then execute the following step 1803. If so, then execute the following steps 1804 and 1805.

[0461] The third preset strategy can be set in advance. The third preset strategy is a strategy for solving the problems of service jamming or even interruption. The third preset strategy can include one or more of the first strategy, the second strategy, the third strategy, the fourth strategy, and the fifth strategy.

[0462] It should be noted that if the electronic device has not executed any of the strategies in the third preset strategy, or has only executed some of the strategies in the third preset strategy within the fifth preset duration before the current moment, it can be determined that all the strategies in the third preset strategy have not been executed within the fifth preset duration before the current moment.

[0463] 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: sending a target event to the target cell, and the target event is used to indicate that the signal quality of the inter-system neighboring cell is higher than the signal quality threshold.

[0464] 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, the electronic device can directly send an A2 event to the target cell or directly execute the fourth strategy.

[0465] 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 be determined whether to send an A2 event to the target cell or execute the fourth strategy in the manner of steps 1602, 1603, and 1606 in the above Figure 16 embodiment.

[0466] In some embodiments, after the electronic device sends an A2 event to the target cell or executes the fourth strategy, it can continue to perform related operations according to the above Figure 17 embodiment.

[0467] Step 1803: If the electronic device has not completed all the strategies in the third preset strategy within the fifth preset duration before the current moment, the electronic device sends an A2 event to the target cell or executes the fourth strategy.

[0468] The operation of the electronic device sending an A2 event to the target cell or executing the fourth strategy is similar to the above, and this application embodiment will not elaborate on this.

[0469] Step 1804: If the electronic device has executed all the strategies in the third preset strategy within the fifth preset duration before the current moment, the electronic device determines the fourth number of times.

[0470] The operation of step 1804 is similar to the operation of step 1102 in the above Figure 11 embodiment, and this application embodiment will not elaborate on this.

[0471] After the electronic device determines the fourth number of times, if the fourth number of times 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 application embodiment will not elaborate on this.

[0472] Step 1805: If the fourth number of times is greater than or equal to the fourth number threshold, the electronic device executes the sixth strategy, and the sixth strategy is: not sending an A2 event to the target cell.

[0473] The operation of step 1805 is similar to the operation of step 1103 in the above Figure 11 embodiment, and this application embodiment will not elaborate on this.

[0474] The above Figure 18The technical effects obtained in the embodiments are similar to those obtained by the corresponding technical means in the previous embodiments, and the embodiments of the present application will not elaborate on this again.

[0475] The following describes the electronic device involved in the embodiments of the present application.

[0476] Figure 19 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Refer to Figure 19 , 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, a headphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc. Among them, the sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, a barometric 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.

[0477] It can be understood that the structure schematically shown in the embodiments of the present application does 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 combine certain components, or split certain components, or have different component arrangements. The components shown may be implemented in hardware, software, or a combination of software and hardware.

[0478] The processor 110 may include one or more processing units. For example, the processor 110 may include an application processor (AP), a modem processor (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), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0479] Among them, the controller may be the nerve center and command center of the electronic device 100. The controller can generate operation control signals according to the instruction operation code and timing signals to complete the control of fetching and executing instructions.

[0480] A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. This memory can save the instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can directly call it from this memory. This avoids repeated accesses, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0481] The wireless communication function of the electronic device 100 can be implemented through antenna 1, antenna 2, the mobile communication module 150, the wireless communication module 160, the Modem, etc.

[0482] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the electronic device 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization rate of the antennas. For example, antenna 1 can be multiplexed as a diversity antenna for a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0483] The mobile communication module 150 may provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc., which are applied to the electronic device 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 150 may receive electromagnetic waves through the antenna 1, filter and amplify the received electromagnetic waves, and then transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 150 may also amplify the signal modulated by the modulation and demodulation processor and convert it into electromagnetic waves through the antenna 1 for radiation. In some embodiments, at least some functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some functional modules of the mobile communication module 150 and at least some modules of the processor 110 may be disposed in the same device.

[0484] The wireless communication module 160 may provide solutions for wireless communications 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 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves through the antenna 2, performs frequency modulation and filtering on the electromagnetic wave signals, and sends the processed signals to the processor 110. The wireless communication module 160 may also receive the signals to be transmitted from the processor 110, perform frequency modulation and amplification on them, and convert them into electromagnetic waves through the antenna 2 for radiation.

[0485] 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, such that electronic device 100 can communicate with a network and other devices through wireless communication technologies. The wireless communication technologies 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 technologies, etc. GNSS may include global positioning system (GPS), global navigation satellite system (GLONASS), beidou navigation satellite system (BDS), quasi-zenith satellite system (QZSS), and / or satellite based augmentation systems (SBAS).

[0486] The SIM card interface 195 is used to connect a SIM card. The SIM card can be in contact with and separated from electronic device 100 by being inserted into or removed from SIM card interface 195. Electronic device 100 may support one or N SIM card interfaces, where N is an integer greater than 1. SIM card interface 195 may support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards may be inserted into the same SIM card interface 195 at the same time. The types of the multiple cards may be the same or different. SIM card interface 195 may also be compatible with different types of SIM cards. SIM card interface 195 may also be compatible with external memory cards. Electronic device 100 interacts with the network through the SIM card to implement functions such as calls and data communication. In some embodiments, electronic device 100 uses an eSIM, i.e., an embedded SIM card. The eSIM card may be embedded in electronic device 100 and cannot be separated from electronic device 100.

[0487] In the embodiments of the present application, an operating system runs on the above components. For example, the iOS operating system developed by Apple Inc., the Android open-source operating system developed by Google Inc., the Windows operating system developed by Microsoft Corporation, etc.

[0488] The operating system of the electronic device 100 may adopt a layered architecture, an event-driven architecture, a microkernel architecture, a microservices architecture, or a cloud architecture. In the embodiments of the present application, the Android system with a layered architecture is taken as an example to exemplarily illustrate the software and hardware structure of the electronic device 100. It should be noted that although the embodiments of the present application are described by taking the Android system as an example, the basic principle thereof also applies to the electronic device 100 based on operating systems such as iOS or Windows.

[0489] Figure 20 This is a software structure block diagram of an electronic device 100 provided by the embodiments of the present application. The software structure adopts a layered architecture. The layered architecture divides the software into several layers, and each layer has a clear role and division of labor. The layers communicate with each other through software interfaces. Taking the Android system running on the AP as an example, in some embodiments, the Android system is divided into five layers, from top to bottom, which are the application layer, the application framework layer (Framework), the Android runtime, the system libraries, the hardware abstraction layer (HAL), and the kernel layer (Kernel).

[0490] The application layer may include a series of application packages. The application packages may include a camera, a gallery, a calendar, a call, a map, a wireless local area network (WLAN), Bluetooth, music, video, short messages, etc. The application layer may also include the system UI (system UI), and the system UI is used to display the interface of the electronic device 100, such as displaying the signal icon corresponding to the SIM card, displaying the call interface, etc.

[0491] The application framework layer provides application programming interfaces (APIs) and programming frameworks 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 telephone manager, a resource manager, a notification manager, etc. The telephone manager is used to provide the call function of the electronic device 100, such as the management of the call state (including connection, hanging up, etc.). The telephone manager is in Figure 20It is represented by telephony in the [description]. The application framework layer may further include a radio interface layer (RIL). The Modem can interact with telephony through the RIL.

[0492] The Modem may include a NAS layer, an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a Physical (PHY) layer. Each of the foregoing layers may be a software module. The Modem can interact with the base station through an antenna. Optionally, the method provided by the embodiments of the present application may be implemented by the Modem.

[0493] 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.

[0494] Some embodiments of the present application provide a chip system, which is applied to an electronic device. The chip system includes at least one processor and an interface. The interface is used to receive instructions and transmit them to the at least one processor; the at least one processor runs the instructions to make the electronic device execute the above-mentioned cell access method. Among them, the chip system may be a Modem, or a system on chip (Soc) including a Modem, and the above method may be implemented by a Modem.

[0495] 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 processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a Digital Versatile Disc (DVD)), or a semiconductor medium (such as a Solid State Disk (SSD)), etc.

[0496] The above are optional embodiments provided by the present application, which are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the technical scope disclosed in the present application shall be included in the protection scope of the present application.

Claims

1. A cell access method, characterized in that, Applied to an electronic device, the method includes: Receiving a redirection message sent by a target cell; Accessing a cell corresponding to a redirection frequency point carried in the redirection message; If accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, determining a first count, where the first count is the number of times of failing to access the cell corresponding to the redirection frequency point indicated by the target cell within a first preset duration before the current moment; If the first count is greater than or equal to a first count threshold, executing a first strategy, where the first strategy is: accessing a cell other than the target cell.

2. The method according to claim 1, wherein Before the step of determining the first count when accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, further includes: If the cell corresponding to the redirection frequency point carried in the redirection message is not searched, determining that accessing the cell corresponding to the redirection frequency point carried in the redirection message fails.

3. The method according to claim 1 or 2, characterized in that, The step of determining the first count when accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, includes: If accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, and the cell identifier of the target cell is not a problematic cell identifier, determining the first count; The method further includes: If accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, and the cell identifier of the target cell is a problematic cell identifier, executing the first strategy.

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

5. The method according to claim 1 or 2, characterized in that, The step of determining the first count when accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, includes: If accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, and the first strategy has not been executed within a fifth preset duration before the current moment, determining the first count.

6. The method according to claim 5, characterized in that, The method further includes: If accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, and the first strategy has been executed within a fifth preset duration before the current moment, determining a second count, where the second count is the number of times of failing to access the cell corresponding to the redirection frequency point indicated by the target frequency point within a second preset duration before the current moment, and the target frequency point is the frequency point of the target cell; If the second count is greater than or equal to a second count threshold, executing a second strategy, 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 includes: If accessing the cell corresponding to the redirection frequency point carried in the redirection message fails, and the first strategy has been executed within a fifth preset duration before the current moment, determining a third count, where the third count is the number of times of failing to access the cell corresponding to the redirection frequency point within a third preset duration before the current moment; If the third number is greater than or equal to the third number threshold, execute the third policy, where the third policy 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 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 an electronic device, the method includes: Receiving a redirection message sent by a target cell; Accessing a cell corresponding to the redirected frequency point carried in the redirection message; If accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, determine a second number, where the second number is the number of times of failure to access the cell corresponding to the redirected frequency point indicated by accessing the cell corresponding to the target frequency point within a second preset duration before the current moment, and the target frequency point is the frequency point of the target cell; If the second number is greater than or equal to the second number threshold, execute the second policy, where the second policy is: access a cell corresponding to a frequency point other than the target frequency point.

9. The method according to claim 8, characterized in that, Before the step of if accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, determine the second number, it further includes: If the cell corresponding to the redirected frequency point carried in the redirection message is not searched, determine that accessing the cell corresponding to the redirected frequency point carried in the redirection message fails.

10. The method according to claim 8 or 9, characterized in that, The step of if accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, determine the second number, includes: If accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, and the target frequency point is not a problematic frequency point, determine the second number; The method further includes: If accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, and the target frequency point is a problematic frequency point, execute the second policy.

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

12. The method according to claim 8 or 9, characterized in that The step of if accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, determine the second number, includes: If accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, and the second policy has not been executed within a fifth preset duration before the current moment, determine the second number; The method further includes: If accessing the cell corresponding to the redirected frequency point carried in the redirection message fails, and the second policy has been executed within a fifth preset duration before the current moment, determine a third number, where the third number is the number of times of failure to access the cell corresponding to the redirected frequency point within a third preset duration before the current moment; If the third number is greater than or equal to the third number threshold, execute the third policy, where the third policy 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 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 an electronic device, the method includes: Receiving a redirection message sent by a target cell; Access the cell corresponding to the redirected frequency band carried in the redirection message, where the frequency band where the redirected frequency band is located is a specified frequency band; If accessing the cell corresponding to the redirected frequency band fails, determine a third count, where the third count is the number of times of failing to access the cell corresponding to the redirected frequency band within a third preset duration before the current moment; If the third count is greater than or equal to a third count threshold, execute a third policy, where the third policy 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 specified frequency band.

14. The method according to claim 13, wherein Before the step of if accessing the cell corresponding to the redirected frequency band fails, determine a third count, further includes: If the cell corresponding to the redirected frequency band is not searched, determine that accessing the cell corresponding to the redirected frequency band fails.

15. The method according to claim 13 or 14, characterized in that The target information is user equipment (UE) capability information; the sending target information to the cell includes: Send a mobility registration update message to the cell, where the mobility registration update message is used to indicate that UE capability information needs to be updated; Receive a UE capability query message sent by the cell; Send 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.

16. The method according to any one of claims 13 to 15, characterized in that The step of if accessing the cell corresponding to the redirected frequency band fails, determine a third count, includes: If accessing the cell corresponding to the redirected frequency band fails, and when the cell identifier of the target cell is not a problem cell identifier and the frequency band of the target cell is not a problem frequency band, determine the third count; The method further includes: If accessing the cell corresponding to the redirected frequency band fails, and when the cell identifier of the target cell is a problem cell identifier and / or the frequency band of the target cell is a problem frequency band, execute the third policy.

17. A cell access method, characterized in that, Applied to an electronic device, the method includes: When accessing a first cell, if it is measured that the signal quality of the first cell is lower than a signal quality threshold, execute a fourth policy, where the fourth policy is: send a target event to the first cell, where the target event is used to indicate that the signal quality of an inter-system neighbor cell is higher than the signal quality threshold; If receiving a redirection message sent by the first cell, access a second cell corresponding to the redirected frequency band carried in the redirection message, where the redirected frequency band carried in the redirection message is the frequency band of the second cell, and the second cell is an inter-system neighbor cell of the first cell; or, if receiving a handover command sent by the first cell, access a second cell indicated by the handover command.

18. The method according to claim 17, wherein The target event is a B event, where the B event is a B1 event or a B2 event.

19. The method according to claim 17 or 18, characterized in that The step of if it is measured that the signal quality of the first cell is lower than a signal quality threshold, execute a fourth policy, includes: If it is measured that the signal quality of the first cell is lower than a signal quality threshold, and when the cell identifier of the first cell is a problem cell identifier and / or the frequency band of the first cell is a problem frequency band, execute the fourth policy.

20. The method according to claim 17 or 18, characterized in that, If it is measured that the signal quality of the first cell is lower than the signal quality threshold, then a fourth policy is executed, including: If it is measured that the signal quality of the first cell is lower than the signal quality threshold, then the fourth policy is executed when all the policies in the first preset policy have been executed within the fifth preset duration before the current moment, and the first preset policy includes one or more of the first policy, the second policy, and the third policy.

21. A cell access method, characterized in that, Applied to an electronic device, the method includes: Receiving a redirection message sent by the first cell; Accessing the cell corresponding to the redirection frequency point carried in the redirection message; If the access to the cell corresponding to the redirection frequency point fails, then when the redirection message is a blind redirection message, a fifth policy is executed, and the fifth policy is: accessing a second cell, where the second cell is an inter-system neighbor cell of the first cell.

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

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

24. A cell access method, characterized in that, Applied to an electronic device, the method includes: When accessing the target cell, if it is measured 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, determine a fourth number, where the fourth number is the number of times that the access to the cell corresponding to the redirection frequency point carried in the redirection message fails within the fourth preset duration 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, then execute a sixth policy, and the sixth policy is: not sending an A2 event to the target cell.

25. The method according to claim 24, wherein The if it is measured 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, determine a fourth number, includes: 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 the problem cell identifier, and the frequency point of the target cell is not the problem frequency point, determine the fourth number; The method further includes: 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 the cell identifier of the target cell is the problem cell identifier and / or the frequency point of the target cell is the problem frequency point, execute the sixth strategy.

26. The method according to claim 24, wherein The step of determining the fourth number when the signal quality of the target cell is measured to be lower than the signal quality threshold and the signal quality of the target cell is lower than the preset signal quality includes: 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 the strategies in the third preset strategy have been executed within the fifth preset duration before the current moment, determine the fourth number, where 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 includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the method described in any one of claims 1 to 26 is implemented.

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

29. A computer-readable storage medium, characterized in that, Instructions are stored in the computer-readable storage medium. When the instructions are run on a computer, the computer is caused to execute the method described in any one of claims 1 to 26.

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