CN115552967A

CN115552967A - Method of avoiding problem cells and related product

Info

Publication number: CN115552967A
Application number: CN202180034783.3A
Authority: CN
Inventors: 徐欣; 时咏晟
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-06-01
Filing date: 2021-05-31
Publication date: 2022-12-30
Also published as: WO2021244485A1

Abstract

Methods and related products are provided for avoiding problem cells. The method of avoiding the problem cell includes the following. In response to detecting that a condition is satisfied, information of a first cell in which a User Equipment (UE) is camped is added to a list, wherein the list is used for the UE to select a cell.

Description

Method of avoiding problem cells and related product

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method for avoiding problem cells and a related product.

Background

As cellular networks evolve from 2G to the present 5G, there are always some locations or cells covering a specific area that may cause various communication problems of a User Equipment (UE), such as data stagnation, out-of-service, dropped calls, etc., due to network misconfiguration or network problems, etc., which are not related to the UE. This situation occurs more during the evolution from the old generation network to the new generation network, for example currently evolving from 4G to 5G.

The UE may recover from this situation by some means, such as retry or airplane mode on-off reset. However, if the UE returns to the same location, similar communication problems may again occur because the UE may camp on the same problem cell. How to reduce the likelihood of camping on a problem cell and even avoid those cells altogether has been a problem to be solved.

Disclosure of Invention

Embodiments provide methods and related products for avoiding problem cells, which may reduce the likelihood of camping on a problem cell or even avoid the problem cell altogether.

In a first aspect, a method of avoiding problem cells is provided. The method comprises the following steps: in response to detecting that a condition is satisfied, information of a first cell in which a User Equipment (UE) is camped is added to a list, wherein the list is used for the UE to select a cell.

In a second aspect, a UE is provided. The UE includes a processor and a memory for storing one or more programs, wherein the one or more programs are for execution by the processor and include instructions for performing some or all of the operations of the method described in the first aspect.

In a third aspect, a non-transitory computer-readable storage medium is provided. The non-transitory computer readable storage medium is for storing a computer program for Electronic Data Interchange (EDI). The computer program comprises instructions for carrying out part or all of the operations of the method described in the first aspect.

In a fourth aspect, a computer program product is provided. The computer program product includes a non-transitory computer readable storage medium storing a computer program. The computer program is operable, with a computer, to perform some or all of the operations of the method described in the first aspect.

In an embodiment of the disclosure, information of the first cell on which the UE camped is added to a list in response to detecting that the condition is satisfied, wherein the list is used for the UE to select a cell. Thus, by means of the list, the UE can select a cell according to the list before camping on a cell that may be the problematic cell. In this way, the possibility of camping on problem cells may be reduced, and even those problem cells may be avoided.

Drawings

In order to more clearly describe the technical solution of the embodiments, the drawings for describing the embodiments will be briefly described below. It is to be understood that the drawings described below are of some embodiments only. Other figures can also be obtained by a person skilled in the art on the basis of the following figures without inventive work.

Fig. 1 is a flow diagram of a method of avoiding problem cells according to an embodiment.

Fig. 2 is a schematic diagram of selecting a cell in an LTE network when a UE is in RRC connected mode according to an embodiment.

Fig. 3 is a flow diagram of a method of avoiding problem cells according to other embodiments.

Fig. 4 is a flow diagram of a method of avoiding problem cells according to other embodiments.

Fig. 5 is a schematic diagram of a method of avoiding problem cells according to other embodiments.

Fig. 6 is a schematic structural diagram of an apparatus for avoiding a problem cell according to an embodiment.

Fig. 7 is a schematic structural diagram of a user equipment according to an embodiment.

Detailed Description

In order to make the technical solutions of the embodiments better understood by those skilled in the art, the technical solutions of the embodiments will be clearly and completely described in the embodiments with reference to the accompanying drawings. It is apparent that the embodiments described below are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," and the like in the description, claims, and drawings of the present disclosure are used for distinguishing between different objects and not necessarily for describing a particular order. The terms "comprising," "including," and "having," and variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the listed steps or elements. Rather, it may optionally include other steps or elements not listed; or may include other steps or elements inherent to processes, methods, articles, or devices.

The term "embodiment" as referred to herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

User Equipment (UE), as referred to herein, may include various handheld devices, vehicle mounted devices, wearable devices, computing devices with wireless communication capabilities or other processing devices connected to wireless modems, as well as various forms of User Equipment (UE), mobile Stations (MSs), mobile terminals, and the like. For convenience of description, the above devices are collectively referred to as a UE.

To facilitate a better understanding of embodiments of the present invention, a brief description of the related art to which the present invention relates follows.

Hereinafter, a detailed description will be given of embodiments of the present disclosure.

Fig. 1 is a flow diagram of a method of avoiding problem cells according to an embodiment. As shown in fig. 1, the method of avoiding the problem cell includes the following.

In block 102, in response to detecting that the condition is satisfied, information of the first cell in which the UE camps is added to a list, wherein the list is used for the UE to select a cell.

The information of the first cell includes at least one of: public Land Mobile Network (PLMN) related information, tracking Area Code (TAC), cell frequency, physical Cell Identity (PCI), global Cell Identity (GCI), time to add information of the first cell to the list, duration of the first timer, and number of times at least one abnormal event occurs.

The current list may include one of a de-prioritized list and a blacklist. In an embodiment of the disclosure, information of the first cell in which the UE camps is added to a list in response to detecting that the condition is satisfied, wherein the list is used for the UE to select a cell. Thus, by means of the list, the UE can select a cell according to the list before camping on a cell that may be the problematic cell. In this way, when the UE returns to the problem cells, the possibility of camping on the problem cells may be reduced, and even those problem cells may be avoided.

As an embodiment, detecting that the condition is met comprises detecting that at least one abnormal event occurs in the first cell.

The exception event may include at least one of: a UE idle mode failure, a UE service related failure, and a UE service performance related failure, wherein the UE service includes at least one of: voice calls, data calls, short Message Service (SMS), and supplementary services, UE service capabilities including at least one of: voice quality and throughput.

As an embodiment, the detection of the satisfaction of the condition includes the following.

At least one abnormal event occurs in the first cell. A number of occurrences of at least one exception event is determined. The number of times at least one abnormal event is detected to occur is greater than a threshold.

As an embodiment, the list comprises a de-prioritized list and a blacklist, and in response to detecting that the condition is satisfied, adding information of the first cell in which the UE camps to the list comprises the following.

Adding information of the first cell to a de-prioritized list when the number of occurrences of the at least one abnormal event is greater than a first threshold. And when the times are greater than a second threshold value, adding the information of the first cell to a blacklist, wherein the second threshold value is greater than the first threshold value.

And when the times are greater than a first threshold value and less than a second threshold value, adding the information of the first cell to a de-priority list. The information of the first cell includes at least one of: PLMN related information, TAC, cell frequency, PCI, GCI, time to add the first cell to the de-prioritized list, duration T of the first timer _depri And a number of times at least one abnormal event occurred.

And when the times are larger than a second threshold value, removing the information of the first cell from the de-priority list, and adding the information of the first cell to a blacklist. The information of the first cell includes at least one of: PLMN related information, TAC, cell frequency, PCI, GCI, time to add the first cell to the blacklist, duration T of the first timer _blacklist And a number of times at least one abnormal event occurred.

To avoid the situation where random problems may lead to normal cells being de-prioritized or blacklisted, a counter C is used _ab The number of times at least one abnormal event occurs in the first cell is recorded. When the number of at least one abnormal event in the cell is greater than a predefined first threshold Th _ab-dep (threshold for deprioritization, e.g. 2) or Th _ab-bl (the threshold for the black-list is e.g. 4) the next action, i.e. de-prioritizing or adding the first cell to the black-list, will be considered. In particular, the UE may be based on C _ab Determines the next action (de-prioritizes or blacklists the first cell) if C _ab Is greater than Th _ab-dep But less than Th _ab-bl The first cell is considered de-prioritized, the de-prioritization action is less aggressive, otherwise if C _ab Is greater than Th _ab-bl Then consider the first cell to be blacklisted.

To reduce the likelihood of the UE camping on the first cell again or even to avoid the UE camping on the first cell again, the first layer action is to de-prioritize the first cell, which may include adding information of the first cell to a de-prioritization list so that the first cell is de-prioritized. A second layer action is to blacklist the first cell, which may include adding information of the first cell to a blacklist, whereby the first cell is blacklisted. As to how to deprioritize or blacklist the first cell, reference may also be made to the following description of the operation of adding information of the first cell to a deprioritized list or blacklist. Through the first layer action, the cell selection priority of the first cell can be reduced, and the possibility that the UE resides in the first cell can be reduced. Through the second layer action, the UE will not camp on or handover to the first cell.

Thus, when the UE first camps on a first cell, if the UE detects that the first cell is a problem cell, information of the first cell may be added to a de-prioritization list or blacklist. When the UE returns to the same location where the first cell is located, the UE may detect whether information of the first cell exists in a de-priority list or a blacklist before camping on the first cell from which the UE may receive signals. When information of a first cell is present in the de-prioritized list or the blacklist, the UE may select another cell without camping on the first cell in question. Thus, when the UE returns to the problem cell, the possibility of camping on the problem cell may be reduced, or even avoided.

As an embodiment, the exception event comprises at least one of: UE idle mode failure, UE service related failure, and UE service performance related failure, wherein the UE service includes at least one of: voice calls, data calls, SMS, and supplementary services, UE service capabilities including at least one of: voice quality and throughput.

The UE idle mode failure may include at least one of: service stop, limited service, voice over long-term evolution (VoLTE)/new Voice over air (VoNR) unregistered, frequent service rejection, and frequent service loss. The UE service related failure may include a failure of at least one of: voice calls (e.g., circuit Switched (CS), IP Multimedia Subsystem (IMS), circuit Switched Fallback (CSFB)), data calls, SMS, and supplementary services. Data call failure may include no data or data service not available. Failure of SMS or supplementary services may include signaling or IMS. UE service performance related failures may include poor voice quality (e.g., CS, voLTE, voNR), low throughput, and the like.

As an embodiment, the first timer is started when information of the first cell is added to a de-prioritized list or a blacklist. Upon detecting expiration of the first timer, information for the first cell is removed from a de-prioritized list or blacklist. The duration of the first timer is based on the number of times at least one abnormal event occurs.

Regardless of whether the cell is de-prioritized or blacklisted, the UE may use the first timer to control the length of time for de-prioritizing or blacklisting the cell. The duration of the timer may be based on the value C of the counter _ab And (5) setting. The larger the value of the calculator, the longer the corresponding first timer duration.

In particular, information at the first cell is added to a de-prioritization List _depri Thereafter, even if the UE is powered down, the information of the first cell remains in the de-prioritized list, thus remembering the problem cell until the expiration of the first timer. When the first timer T _depri Upon expiration, the UE will slave de-priority List _depri Removing the information of the first cell and resetting all data of the first cell. When information of the first cell is added to the blacklist _blacklist Even if the UE is powered down, the information of the first cell is kept in the blacklist, thus remembering the problem cell until the first timer expires. When the first timer T _blacklist Upon expiration, the UE will be listed from the blacklist _blacklist Removing the information of the first cell.

As an embodiment, after the information of the first cell is added to the blacklist, a number of times the information of the first cell is added to the blacklist within the monitoring period is determined. Updating the duration of the first timer according to the number of times the information of the first cell is added to the blacklist.

In particular, T _blacklist Will be based on the monitoring period T _mon The inner cell was added to the List _blacklist Number of times, T _mon And may be for an extended period of time, such as days or weeks. If in the monitoring period T _mon If the cell was added to the blacklist N times, then the next time the information of the first cell is added to the List _blacklist ，T _blacklist Will be (2n + 1) base value (base value to be defined). This may further ensure that problem cells are blacklisted for longer periods of time. When passing T _mon Thereafter, all cell data will be reset.

As an embodiment, it is determined whether the information of the first cell is present in the de-prioritized list before adding the information of the first cell to the de-prioritized list. And when detecting that the information of the first cell exists in the de-priority list, removing the information of the first cell from the de-priority list, and adding the information of the first cell to a blacklist.

As an embodiment, the UE further detects that the signal strength of the first cell is greater than a third threshold before detecting that the at least one abnormal event occurs in the first cell.

By detecting that the signal strength of the first cell is greater than the third threshold before detecting that the at least one anomalous event occurred in the first cell, problems due to poor coverage or poor signal may be eliminated. Communication problems caused by random problems such as poor coverage or poor signal can be overcome by moving to another location, a factor which is considered by the present application. After detecting that the signal strength of the first cell is greater than the third threshold, performing subsequent operations, such as detecting that at least one abnormal event occurs in the first cell and determining the number of times at least one abnormal event occurs. The third threshold may be a static value or a dynamic value, and may be determined to truly reflect the signal level, with weaker coverage when the signal strength is below the third threshold.

As an embodiment, each of the different RATs corresponds to a third threshold for different Radio Access Technologies (RATs) of the first cell. For example, the value of the third threshold is different for different RATs of the third cell.

The value of the third threshold is different for different RATs, e.g., second generation wireless telephony technology (2G), third generation wireless telephony technology (3G), fourth generation mobile communication technology (4G), and fifth generation mobile communication technology (5G).

As an embodiment, after adding the information of the first cell to the de-prioritized list, the UE may also perform the following to reduce the likelihood of reselecting to the first cell. And when the UE is detected to be in the idle mode, setting the selection priority of the first cell to be the lowest. An offset is applied to an actual measurement of a Reference Signal Received Power (RSRP) corresponding to the first cell to obtain a processed measurement. A cell is selected based on the selection priority of the first cell and the processed measurement result.

Specifically, information of the first cell is added to the de-prioritized List for the first time _depri Thereafter, when the UE is in idle mode, the UE sets the selection priority of the first cell to be lowest and applies an internal Offset (Offset) _idle Negative value) to reduce the actual measurement result of RSRP corresponding to the first cell. Thus, during cell measurements in idle mode, the UE will be more likely to change to not in List _depri Other cells in (1). Offset _idle Which may be a fixed value or a dynamic value.

In addition, when the UE returns to the same location where the first cell is located and is about to camp on the first cell, it may be detected whether information of the first cell is in a de-prioritized list or a blacklist through the de-prioritized list or the blacklist. Upon detecting that the information of the first cell is in the de-prioritization list, the UE may apply an offset to actual measurement results of RSRP corresponding to the first cell to obtain processed measurement results, and select a cell based on the processed measurement results and the cell reselection priorities, in addition to internally setting the cell reselection priorities (of the cells in the list) to be lowest.

As an embodiment, after adding the information of the first cell to the de-prioritized list, the UE may also perform the following operations to reduce the likelihood of reselecting to the first cell. When detecting that the UE is in a Radio Resource Control (RRC) connected mode, applying an offset for deprioritization to an actual measurement result of a parameter of a first cell to be measured, where the parameter of the first cell to be measured is configured by a network, to obtain a processed measurement result. And sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result.

Referring to fig. 2, fig. 2 is a schematic diagram of selecting another cell in an LTE network when a UE is in RRC connected mode according to an embodiment. Specifically, when information of the first cell exists in the de-priority list and the UE is in the RRC-connected mode, the UE will use Offset for de-priority _conn Applied to the serving cell measurements (and non-serving cells in the list). Thus, the UE may trigger a measurement report event (defined in the 3gpp 36.331 (4G)/38.331 (5G) specification) and send a measurement report with the processed measurement results to the network, so that the network can handover the UE to another neighboring cell. Offset for deprioritization _conn Is a negative value and may be a fixed value or a dynamic value.

As an embodiment, after adding the information of the first cell to the blacklist, the UE may further perform the following operation to prevent the UE from reselecting the first cell. Upon detecting that the UE is in idle mode, another cell different from the first cell is selected.

Is added to the List for the first time in the current cell _blacklist Thereafter, when the UE is in idle mode, the UE will immediately trigger cell selection. List unless there are no other cells available _blacklist Will not be a cell selection candidate.

When the UE returns to the same place where the first cell is located and is about to camp on the first cell, whether the information of the first cell is in the deprioritization state or not can be detected through the deprioritization list or the blacklistIn a list or blacklist. Upon detecting that the information of the first cell is in the blacklist, the UE may also perform a similar operation, i.e. trigger cell selection immediately, and List _blacklist Will not be a cell selection candidate.

As an embodiment, after adding the information of the first cell to the blacklist, the UE may further perform the following operation to prevent the UE from reselecting the first cell. And when detecting that the UE is in an RRC connection mode, applying an offset for a blacklist to an actual measurement result of the parameter of the first cell to obtain a processed measurement result, wherein the offset for the blacklist is greater than the offset for deprioritization, and the parameter of the first cell to be measured is configured by a network. And sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result.

Adding the current cell to the List for the first time _blacklist Thereafter, when the UE is in connected mode, the UE penalizes the Offset value Offset with a larger negative number _black Applied to the serving cell measurement results (and the non-serving cells in the list) so that the UE can immediately trigger a measurement report to the network and wait for the network to handover the UE to other cells. When the UE returns to the same location where the first cell is located and is about to camp on the first cell, it may be detected whether the information of the first cell is in a de-priority list or a blacklist through the de-priority list or the blacklist. The same operations described above may also be performed when it is detected that the information of the first cell is in the blacklist.

As an embodiment, after sending the measurement report carrying the processed measurement result to the network, the second timer is started when sending the measurement report. The second timer is stopped when it is detected that the UE is handed over to another cell or the UE returns to idle mode before the second timer expires. And returning to the idle mode for cell selection when the UE is detected not to be switched to another cell or not to return to the idle mode before the second timer expires.

In particular, after issuing a measurement report, the UE may start a timer T _handover . If at T _handover Before expiration, the network switches the UE to another cell or the UE returns to idle mode, and then stops T _handover . Otherwise, when T _handover At expiry, the UE will change to idle mode locally and then select another cell (not in List) _blacklist In (c) for residence.

Furthermore, if a certain RAT (2G/3G/4G/5G and future RATs) has a high percentage of cells causing a problem, the same actions described above may be extended to the problem RAT. The following also describes a scheme that enables the UE to de-prioritize or blacklist the problematic RAT for a period of time.

For different RATs (e.g., 2G/3G/4G/5G), the UE keeps track of the List for each RAT _depri C of the middle cell _ab The sum of the values. If the sum of the RAT values is greater than Th _ab-deprat (threshold for RAT de-prioritization) but less than Th _ab-blrat (threshold for RAT blacklist), RAT de-prioritization is considered (i.e. RAT priority is reduced), otherwise, if the above-mentioned sum value is greater than Th _ab-blrat Then the RAT is considered to be blacklisted (i.e., RAT is disabled). Alternatively, the UE may have a defined timer to control the length of time to de-prioritize or blacklist RATs. These actions are only performed when the UE is in idle mode.

When the UE decides to de-prioritize the problematic RAT for a period of time (T) _deprirat ) The UE adds the RAT information to a RAT de-priority List (List) _deprirat If the information is not present in the list). List _deprirat The RAT-related information in (b) will contain at least the following: RAT join List _deprirat Time, T _deprirat Value, C of RAT _ab The value is obtained. List List even after UE restart _deprirat Will also be maintained to remember the problem RAT. If the time T has elapsed since the addition of the RAT information _deprirat The UE will remove the RAT from the list.

When RAT is first added to List _deprirat And when the UE is in idle mode, the UE will set the RAT priority internally to be lowest. Thus, the likelihood of the UE camping on any cell of the RAT is reduced.

When the UE decidesAdding a problem RAT to a blacklist for a period of time (T) _blacklistrat ) UE adds RAT information to List _blacklistrat (if the information is not present in the list). List _blacklistrat The RAT-related information in (b) will contain at least the following: cell join List _blacklistrat Time, T _blacklistrat Value, C of RAT _ab The value is obtained.

This list will remain even after the UE is restarted, keeping in mind the problem cells. At the time of passage T _blacklistrat The UE will then remove the RAT from the list and the UE adds the RAT to the supported list. Is added to the List at the current RAT _blacklistrat And when the UE is in idle mode, the UE will immediately disable the RAT and trigger cell reselection, and the UE will not camp on the cell of the RAT.

As an embodiment, when the UE moves to a new location or returns to the same location where the first cell is located, the UE may detect whether information of the second cell exists in the list. When the information of the second cell is present in the list, the cell is selected according to the list.

The second cell may be the same as the first cell when the UE returns to the same location where the first cell is located.

The list may include a de-prioritized list and a blacklist. Whether the information of the second cell exists in the de-priority list or the blacklist can be detected by querying the de-priority list or the blacklist based on the Identity (ID) of the second cell. The information of the second cell includes at least one of: PLMN related information, TAC, cell frequency, PCI, GCI, time to add information of target cell to de-priority list or blacklist, duration T of first timer _depri And a number of times at least one abnormal event occurred. The second cell refers to a cell in which the UE is to camp.

When the information of the second cell exists in the de-priority list, when the UE is detected to be in an idle mode, the selection priority of the second cell is set to be the lowest, and an offset is applied to the actual measurement result of the RSRP corresponding to the target cell to obtain a processed measurement result. The cell may be selected based on the processed measurement result and a selection priority of the second cell. Upon detecting that the UE is in an RRC connected mode, applying an offset for de-prioritization to actual measurement results of parameters of a target cell to obtain processed measurement results, and sending a measurement report carrying the processed measurement results to the network, wherein the measurement report is used for the network to handover the UE to another cell based on the processed measurement results. Thus, the likelihood of the UE camping on a problem cell where the UE has camped on may be reduced.

When the information of the second cell exists in the blacklist, applying an offset for the blacklist to an actual measurement result of the parameter of the target cell to obtain a processed measurement result when the UE is detected to be in the RRC connected mode. And sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result. The offset for the blacklist is larger than the offset for de-prioritization. Accordingly, it is possible to prevent the UE from camping on a problem cell where the UE has camped on.

Referring to fig. 3 and 4, fig. 3 describes an operation when information of a target cell is added to a de-prioritized list, and fig. 4 describes an operation when information of a target cell is added to a blacklist.

Fig. 3 is a flow diagram of a method of avoiding problem cells according to an embodiment. As shown in fig. 3, the method of avoiding the problem cell includes the following.

At block 202, it is detected that the signal strength of the target cell is greater than a third threshold.

At block 204, it is detected that at least one abnormal event occurs in a target cell in which the UE is camped.

At block 206, it is determined that the number of times the at least one abnormal event occurred is greater than a first threshold and less than a second threshold.

At block 208, a mode of the UE is detected, wherein the mode of the UE includes an idle mode and an RRC connected mode.

Different operations to de-prioritize the target cell may be performed when the UE is in different modes. In particular, upon detecting that the UE is in idle mode, operations of block 210 are performed; upon detecting that the UE is in the RRC connected mode, operations of block 212 are performed.

At block 210, upon detecting that the UE is in idle mode, the selection priority of the target cell is set to be lowest and an offset is applied to actual measurement results of RSRP corresponding to the target cell to obtain processed measurement results, selecting a cell based on the processed measurement results.

At block 212, upon detecting that the UE is in the RRC connected mode, an offset for de-prioritization is applied to the actual measurement result of the parameter of the target cell to obtain a processed measurement result, and a measurement report carrying the processed measurement result is sent to the network.

The parameters to be measured of the target cell are configured by the network. The measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

Information for the target cell may also be added to the de-prioritized list when performing the operation of de-prioritizing the target cell (e.g., the operations of blocks 210 and 212). Thus, when the UE returns to the same location as the target cell, the UE can detect whether the information of the target cell exists in the de-prioritized list or the blacklist before camping on the target cell from which the UE can receive signals. When the information of the target cell exists in the de-prioritized list or the blacklist, the UE may select another cell without camping on the problematic target cell. Thus, when the UE returns to the problem cells, the possibility of camping on the problem cells may be reduced, and even those problem cells may be avoided.

At block 214, it is determined whether information for the target cell exists in the de-prioritized list.

At block 216, when it is determined that the information for the target cell does not exist in the de-prioritized list, the information for the target cell is added to the de-prioritized list.

The information of the target cell includes at least one of: PLMN related information, TAC, cell frequency, PCI, GCI, time to add information of the target cell to the de-priority list, duration of the first timer, and number of occurrences of the at least one abnormal event.

Upon detecting that the information for the target cell is present in the de-prioritized list, the information for the target cell is removed from the de-prioritized list and the target cell is blacklisted, at block 218.

At block 220, upon determining that information for the target cell is present in the de-prioritized list, the information for the target cell is removed from the de-prioritized list upon detecting expiration of a first timer, wherein a duration of the first timer is based on a number of times at least one abnormal event occurred.

Details of the operations of blocks 202-220 may refer to the corresponding descriptions of fig. 1 and 2, and are not repeated here.

Fig. 4 is a flowchart illustrating a method of avoiding problem cells according to an embodiment. As shown in fig. 4, the method of avoiding the problem cell includes the following.

At block 302, it is detected that the signal strength of the target cell is greater than a third threshold.

At block 304, it is detected that at least one abnormal event occurs in a target cell in which the UE is camped.

At block 306, it is determined that the number of times at least one abnormal event occurred is greater than a second threshold.

At block 308, a mode of the UE is detected.

Different operations to de-prioritize the target cell may be performed when the UE is in different modes. In particular, upon detecting that the UE is in idle mode, operations of block 310 are performed; upon detecting that the UE is in the RRC connected mode, operations of

blocks

312 and 318 are performed.

At block 310, upon detecting that the UE is in idle mode, another cell is selected by blacklisting the target cell, i.e., selecting another cell different from the target cell.

At block 312, upon detecting that the UE is in the RRC connected mode, an offset for blacklist is applied to the actual measurement result of the parameters of the target cell to obtain a processed measurement result, and a measurement report carrying the processed measurement result is sent to the network.

At block 314, a second timer is started when the measurement report is sent.

At block 316, the second timer is stopped upon detecting that the UE hands off to another cell or that the UE returns to idle mode before the second timer expires.

At block 318, return to idle mode for cell selection is detected when the UE is not handed over to another cell or returns to idle mode before the second timer expires.

The offset for the black list is larger than the offset for de-prioritization. The parameters to be measured of the target cell are configured by the network. The measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

Information of the target cell may also be added to the blacklist when performing operations to blacklist the target cell (e.g., operations of blocks 310 through 318). Thus, when the UE returns to the same location as the target cell, the UE can detect whether the information of the target cell exists in the de-prioritized list or the blacklist before camping on the target cell from which the UE can receive signals. When the information of the target cell exists in the de-prioritized list or the blacklist, the UE may select another cell without camping on the problematic target cell. Thus, when the UE returns to the problem cells, the possibility of camping on the problem cells may be reduced, and even those problem cells may be avoided.

At block 320, information of the target cell is added to a blacklist.

The information of the target cell includes at least one of: PLMN related information, TAC, cell frequency, PCI, GCI, time to add the target cell to the de-prioritization list, duration of the first timer, and number of times at least one abnormal event occurs.

At block 322, upon detecting expiration of the first timer, information for the cell is removed from the blacklist.

The duration of the first timer is based on the number of times at least one abnormal event occurs. Further, the duration of the first timer may be dynamically updated as follows. The number of times the target cell is blacklisted is determined within a monitoring period. And updating the duration of the first timer according to the number of times that the target cell is added into the blacklist.

Details of the operations of blocks 302-322 can be found in the corresponding descriptions of fig. 1 and 2, and are not repeated here.

Referring to fig. 5, fig. 5 is a schematic diagram of a method of avoiding problematic cells according to other embodiments. As shown in fig. 5 and as in the embodiments above, the UE detects a problem with a cell (represented by the shaded area in fig. 5), adds the cell to the de-prioritized list, and then reselects or switches (represented by the arrow in fig. 5) to another cell. Alternatively, the UE detects a problem with a cell (represented by the shaded area in fig. 5), blacklists the cell, and then reselects or switches (represented by the arrow in fig. 5) to another cell.

Through the operations of fig. 3 or 4, when the UE returns to the same location where the target cell is located, the UE may detect whether information of the target cell exists in a de-prioritized list or a blacklist before camping on the target cell from which the UE may receive signals. When the information of the target cell exists in the de-prioritized list or the blacklist, the UE may select another cell without camping on the problematic target cell. Thus, when the UE returns to the problem cells, the possibility of camping on the problem cells may be reduced, and even those problem cells may be avoided.

The above-described embodiments of the present invention are described primarily in terms of methods performed therein. It is to be understood that, in order to implement the above-described functions, the UE includes a hardware structure and/or software modules corresponding to the respective functions. Those of skill in the art will readily appreciate that the present invention may be implemented by hardware or a combination of hardware and computer software in combination with the exemplary elements and method steps described in the embodiments disclosed herein. Whether a function is implemented as hardware or computer software-driven hardware depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may use different approaches to achieve the functionality described for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

According to an embodiment of the present invention, the functional units may be divided for the first wireless headset as exemplified in the above method. For example, each functional unit may be divided according to each function, and two or more functions may be integrated into one processing unit. The integrated unit may be implemented in the form of a hardware or software functional unit. It should be noted that the division of the units in the embodiment is schematic, and only the division of the functions is logical, and other division manners may be available in actual implementation.

Fig. 6 is a schematic structural diagram of an apparatus for avoiding a problem cell according to an embodiment. As shown in fig. 6, the apparatus for avoiding the problem cell includes an adding unit 402 and a detecting unit 404.

The adding unit 402 is configured to add information of the first cell where the UE camps to a list in response to the detecting unit 404 detecting that the condition is satisfied, wherein the list is used for the UE to select the cell.

In an embodiment of the disclosure, information of the first cell in which the UE camps is added to a list in response to detecting that the condition is satisfied, wherein the list is used for the UE to select a cell. Thus, by means of the list, the UE can select a cell according to the list before camping on a cell that may be the problematic cell. In this way, the possibility of camping on problem cells may be reduced, and even those problem cells may be avoided.

As an embodiment, the detecting unit 404 is configured to detect that at least one abnormal event occurs in the first cell.

As an embodiment, the detecting unit 404 is configured to detect that at least one abnormal event occurs in the first cell, determine a number of times of the at least one abnormal event, and detect that the number of times of the at least one abnormal event is greater than a threshold.

As an embodiment, the list includes a de-priority list and a blacklist, and the adding unit 402 is configured to add the information of the first cell to the de-priority list when the number of times of occurrence of the at least one abnormal event is greater than a first threshold, or add the information of the first cell to the blacklist when the number of times is greater than a second threshold, where the second threshold is greater than the first threshold.

As an embodiment, the above list includes a de-priority list and a black list, and the adding unit 402 is configured to add the information of the first cell to the de-priority list when the number of times of occurrence of the at least one abnormal event is greater than a first threshold and less than a second threshold; and when the times are greater than a second threshold value, removing the information of the first cell from the de-priority list and adding the information of the first cell to a blacklist.

As an embodiment, the above apparatus for avoiding the problem cell further includes a setting unit 406 and a removing unit 408.

The setting unit 406 is configured to start a first timer when information of the first cell is added to the de-prioritization list or the blacklist.

The removing unit 408 is configured to remove the information of the first cell from the de-prioritized list or the blacklist when detecting that a first timer expires, wherein a duration of the first timer is based on a number of times at least one abnormal event occurs.

As an embodiment, the setting unit 406 is further configured to determine the number of times the first cell is added to the blacklist in the monitoring period; and updating the duration of the first timer according to the number of times the first cell is added to the blacklist.

As an embodiment, the adding unit 402 is further configured to determine whether the information of the first cell exists in the de-priority list before adding the information of the first cell to the de-priority list; and when detecting that the information of the first cell exists in the de-priority list, removing the information of the first cell from the de-priority list, and adding the information of the first cell to a blacklist.

As an embodiment, the apparatus for avoiding the problem cell further includes a first selecting unit 410. The first selecting unit 410 is configured to set the selection priority of the first cell to be the lowest when detecting that the UE is in the idle mode after the adding unit 402 adds the information of the first cell to the de-priority list; applying an offset to an actual measurement result of the RSRP corresponding to the first cell to obtain a processed measurement result; a cell is selected based on the processed measurement results.

As an embodiment, the above apparatus for avoiding the problem cell further includes a second selecting unit 412. The second selecting unit 412 is configured to, when it is detected that the UE is in the RRC connected mode after the adding unit 402 adds the information of the first cell to the de-priority list, apply an offset for de-priority to an actual measurement result of a parameter of the first cell to obtain a processed measurement result, where the parameter of the first cell to be measured is configured by the network; and sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result.

As an embodiment, the above apparatus for avoiding the problem cell further includes a third selecting unit 414. The third selecting unit 414 is configured to select another cell different from the first cell when the adding unit 402 adds the information of the first cell to the blacklist and detects that the UE is in the idle mode.

As an embodiment, the above apparatus for avoiding the problem cell further includes a fourth selecting unit 416. The fourth selecting unit 416 is configured to, after the adding unit 402 adds the information of the first cell to the blacklist, apply an offset for the blacklist to an actual measurement result of a parameter of the first cell to obtain a processed measurement result when the UE is detected to be in the RRC connected mode, where the offset for the blacklist is greater than the offset for de-prioritization, and the parameter of the first cell to be measured is configured by the network. And sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result.

As an embodiment, the fourth selecting unit 416 is further configured to start a second timer when sending the measurement report; stopping the second timer when detecting that the UE is switched to another cell or the UE returns to an idle mode before the second timer expires; and returning to the idle mode for cell selection when the UE is detected not to be switched to another cell or not to return to the idle mode before the second timer expires.

As an embodiment, the exception event comprises at least one of: a UE idle mode failure, a UE service related failure, and a UE service performance related failure, wherein the UE service includes at least one of: voice calls, data calls, SMS, and supplementary services, UE service capabilities including at least one of: voice quality and throughput.

As an embodiment, the information of the first cell includes at least one of: PLMN related information,TAC, cell frequency, PCI, GCI, time to add information of a first cell to a list, duration T of a first timer _depri And a number of times at least one abnormal event occurred.

As an embodiment, the apparatus for avoiding the problem cell further includes a signal strength detection unit 418. The signal strength detecting unit 418 is configured to detect that the signal strength of the first cell where the UE camps is greater than the third threshold before the adding unit 402 adds the information of the first cell to the list in response to detecting that the condition is satisfied.

As an embodiment, for the different RATs of the first cell, each of the different RATs corresponds to a third threshold.

As an embodiment, the apparatus for avoiding the problem cell further includes a fifth selecting unit 420. A fifth selecting unit 420 is configured to detect whether information of the second cell exists in the list; when the information of the second cell is present in the list, the cell is selected according to the list.

As an embodiment, the above list includes a de-prioritized list and a blacklist, and the fifth selecting unit, which selects a cell according to the list when the information of the second cell exists in the list, is configured to: and when the information of the second cell exists in the de-priority list, selecting the cell according to the de-priority list, or when the information of the second cell exists in the blacklist, selecting the cell according to the blacklist.

Fig. 7 is a schematic structural diagram of a UE according to an embodiment. As shown in fig. 7, the UE includes a processor 501, memory 502, a communication interface 503, and one or more programs 504, the one or more programs 504 being stored in the memory 502 and executed by the processor 501. The one or more programs 504 include instructions for performing the following operations.

In response to detecting that the condition is satisfied, information of a first cell in which the UE camps is added to a list, wherein the list is used for the UE to select a cell.

In an embodiment of the disclosure, information of the first cell in which the UE camps is added to a list in response to detecting that the condition is satisfied, wherein the list is used for the UE to select a cell. Thus, by means of the list, the UE may select a cell according to the list before camping on a cell that may be a problem cell. In this way, the possibility of camping on problem cells may be reduced, and even those problem cells may be avoided.

As an embodiment, upon detecting that the condition is satisfied, the one or more programs 504 further include instructions for: at least one abnormal event occurring in the first cell is detected.

As an embodiment, upon detecting that the condition is satisfied, the one or more programs 504 further include instructions for: the method comprises the steps of detecting that at least one abnormal event occurs in a first cell, determining the occurrence frequency of the at least one abnormal event, and detecting that the occurrence frequency of the at least one abnormal event is larger than a threshold value.

As an embodiment, the list includes a de-prioritized list and a blacklist, and the one or more programs 504 further include instructions for, in response to detecting that a condition is satisfied, adding information of the first cell in which the UE camps to the list.

And when the occurrence frequency of at least one abnormal event is greater than a first threshold value, adding the information of the first cell to a de-priority list, or when the occurrence frequency is greater than a second threshold value, adding the information of the first cell to a black list, wherein the second threshold value is greater than the first threshold value.

As an embodiment, the list includes a de-prioritized list and a blacklist, and the one or more programs 504 further include instructions for adding information of the first cell in which the UE camps to the list in response to detecting that the condition is satisfied. When the occurrence frequency of at least one abnormal event is larger than a first threshold value and smaller than a second threshold value, adding the information of the first cell to a de-priority list; and when the times are larger than a second threshold value, removing the information of the first cell from the de-priority list, and adding the information of the first cell to a blacklist.

As an embodiment, the information of the first cell includes at least one of: PLMN related information, TAC, cell frequency, PCI, GCI, time to add information of the first cell to the current list, duration of the first timer, and number of times at least one abnormal event occurs.

As an embodiment, the one or more programs 504 further include instructions for: starting a first timer when information of a first cell is added to a de-priority list or a blacklist; removing information of the first cell from a de-prioritized list or a blacklist upon detecting that a first timer expires, wherein a duration of the first timer is based on a number of times at least one abnormal event occurred.

As an embodiment, the one or more programs 504 further include instructions for: before adding the information of the first cell to the de-priority list, detecting whether the information of the first cell exists in the de-priority list; and when detecting that the information of the first cell exists in the de-priority list, removing the information of the first cell from the de-priority list, and adding the information of the first cell to a blacklist.

As an embodiment, the one or more programs 504 further include instructions for: determining a number of times that information of the first cell is added to a blacklist within a monitoring period; and updating the duration of the first timer according to the number of times the information of the first cell is added to the blacklist.

As an embodiment, the one or more programs 504 further include instructions for: the signal strength of the first cell is detected to be greater than a third threshold before detecting the occurrence of the at least one anomalous event in the first cell.

As an embodiment, one or more programs 504 also include instructions for the following.

After adding the information of the first cell to the de-priority list, setting the selection priority of the first cell to be lowest when detecting that the UE is in the idle mode. An offset is applied to an actual measurement result of the RSRP corresponding to the first cell to obtain a processed measurement result. A cell is selected based on the processed measurement results.

After adding the information of the first cell to the de-priority list, when detecting that the UE is in an RRC connected mode, applying an offset for de-priority to an actual measurement result of a parameter of the first cell to obtain a processed measurement result, wherein the parameter of the first cell to be measured is configured by a network; and sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result.

As an embodiment, the one or more programs 504 further include instructions for: after adding the information of the first cell to the blacklist, when detecting that the UE is in an idle mode, selecting another cell different from the first cell.

As an embodiment, the one or more programs 504 further include instructions for: after adding the information of the first cell to a blacklist, when detecting that the UE is in an RRC connected mode, applying an offset for the blacklist to an actual measurement result of the parameter of the first cell to obtain a processed measurement result, wherein the offset for the blacklist is greater than the offset for deprioritization, and the parameter of the first cell to be measured is configured by a network. And sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to switch the UE to another cell based on the processed measurement result.

As an embodiment, the one or more programs 504 further include instructions for: starting a second timer when sending the measurement report; stopping the second timer when detecting that the UE is switched to another cell or the UE returns to an idle mode before the second timer expires; and returning to the idle mode for cell selection when the UE is detected not to be switched to another cell or not to return to the idle mode before the second timer expires.

As an embodiment, the one or more programs 504 further include instructions for: detecting whether information of the second cell exists in the list; when the information of the second cell is present in the list, the cell is selected according to the list.

In an embodiment, the list includes a de-prioritized list and a blacklist, and the one or more programs 504 further include instructions for: the cell is selected according to the de-prioritized list when the information of the second cell exists in the de-prioritized list, or according to the blacklist when the information of the second cell exists in the blacklist.

A non-transitory computer storage medium is also provided. The non-transitory computer storage medium is used to store programs that, when executed, may be used to perform some or all of the operations of a method for rendering virtual objects based on lighting estimates, or a method of avoiding problem cells as described in the above method embodiments.

A computer program product is also provided. The computer program product includes a non-transitory computer readable storage medium storing a computer program. These computer programs may be for operation with a computer to perform some or all of the operations of a method for rendering virtual objects based on lighting estimates, or a method of avoiding problem cells as described above in the method embodiments.

It is noted that the above method implementations are described as a series of combinations of acts for the sake of simplicity. However, those skilled in the art will appreciate that the present disclosure is not limited by the order of acts described. Certain steps or operations may be performed in other sequences or concurrently in accordance with the disclosure. In addition, those skilled in the art will appreciate that the embodiments described in the specification are exemplary embodiments and that the acts and modules referred to are not necessarily required to practice the invention.

In the above embodiments, the description of each embodiment has its focus. For parts of one embodiment that are not described in detail, reference may be made to the description relating to other embodiments.

In the embodiments of the present invention, it should be noted that the apparatuses disclosed in the embodiments provided herein may be implemented by other means. For example, the device/apparatus implementations described above are merely illustrative; for example, the division of the cells is only a logical functional division, and other division modes may be available in actual implementation; for example, various elements or components may be combined or integrated in another system or certain functions may be omitted, or not performed. Further, the coupling or communication connection between the various illustrated or discussed components may be a direct coupling or communication connection, or an indirect coupling or communication between devices or units through some interface, and may be an electrical, mechanical, or other form of connection.

Units described as separate components may or may not be physically separate, and components illustrated as units may or may not be physical units, that is, the components may be in the same place or may be distributed to multiple network elements. All or part of the units can be selected according to actual needs to achieve the purpose of the technical scheme of the embodiment.

Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist physically, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of a hardware or software functional unit.

When the integrated unit is implemented in the form of a software functional unit and sold or used as a separate product, it may be stored in a computer readable memory. Based on such understanding, the technical solutions of the present invention may be stored in a memory in the form of a software product and include instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or part of the steps described in various embodiments of the present disclosure, or some technical solutions contributing to the related art, or all or part of the technical solutions. The memory includes various media capable of storing program code, such as a Universal Serial Bus (USB) flash disk, a read-only memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, a Compact Disc (CD), etc.

Those of ordinary skill in the art will note that all or part of the various methods of the above implementations may be implemented by a program to indicate associated hardware, where the program may be stored in a computer readable memory, which may include flash memory, ROM, RAM, disk or CD, etc.

The foregoing detailed description of the embodiments of the invention has been presented to illustrate the principles and practice of the invention by way of specific examples. The above description of the embodiments is only intended to facilitate the understanding of the method and the core idea of the invention. Meanwhile, those skilled in the art can modify the specific embodiments and the application scope according to the concept of the present invention. In view of the above, the contents of the description should not be construed as limiting the present invention.

Claims

1. A method of avoiding problem cells, comprising:

in response to detecting that a condition is satisfied, information of a first cell in which a User Equipment (UE) is camped is added to a list, wherein the list is used for the UE to select a cell.

2. The method of claim 1, wherein detecting that the condition is satisfied comprises:

detecting that at least one abnormal event occurs in the first cell.

3. The method of claim 1, wherein detecting that the condition is satisfied comprises:

detecting at least one abnormal event of the first cell;

determining a number of times the at least one exception event occurred; and

detecting that the number of occurrences of the at least one exception event is greater than a threshold.

4. The method of claim 3, wherein the list comprises a de-prioritized list or a blacklist, and in response to detecting that the condition is satisfied, adding the information of the first cell in which the UE is camped to the list comprises one of:

adding the information of the first cell to the de-prioritized list when the number of occurrences of the at least one exception event is greater than a first threshold; or

Adding the information of the first cell to the blacklist when the number of times is greater than a second threshold, the second threshold being greater than the first threshold.

5. The method of claim 3, wherein the list comprises a de-prioritization and a blacklist, and in response to detecting that the condition is satisfied, adding the information of the first cell in which the UE is camped to the list comprises:

adding the information of the first cell to the de-prioritized list when the number of occurrences of the at least one exception event is greater than a third threshold and less than a fourth threshold; and

removing the information of the first cell from the de-prioritized list and adding the information of the first cell to the blacklist when the number of times is greater than the fourth threshold.

6. The method of claim 4 or 5, further comprising:

starting a first timer when the information of the first cell is added to the de-prioritized list or the blacklist; and

removing the information of the first cell from the de-prioritized list or the blacklist upon detecting expiration of the first timer, wherein a duration of the first timer is based on the number of occurrences of the at least one abnormal event.

7. The method of any of claims 4 to 6, further comprising:

determining a number of times the information of the first cell is added to the blacklist within a monitoring period; and

updating the duration of the first timer in accordance with the number of times the information of the first cell is added to the blacklist.

8. The method of any of claims 4 to 7, further comprising:

prior to adding the information of the first cell to the de-prioritized list:

determining whether the information of the first cell is present in the de-prioritized list; and

removing the information of the first cell from the de-prioritized list and adding the information of the first cell to the blacklist when detecting that the information of the first cell exists in the de-prioritized list.

9. The method of any of claims 4 to 8, further comprising:

after adding the information of the first cell to the de-prioritized list:

setting the selection priority of the first cell to be the lowest when the UE is detected to be in an idle mode;

applying an offset to an actual measurement of Reference Signal Received Power (RSRP) corresponding to the first cell to obtain a processed measurement; and

selecting a cell based on the selection priority of the first cell and the processed measurement result.

10. The method of any of claims 4 to 9, further comprising:

after adding the information of the first cell to the de-prioritized list:

applying an offset for de-prioritization to actual measurements of parameters of the first cell to obtain processed measurements when detecting that the UE is in a Radio Resource Control (RRC) connected mode, wherein the parameters of the first cell to be measured are configured by a network; and

sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to handover the UE to a cell based on the processed measurement result.

11. The method of any of claims 4 to 10, further comprising:

after adding the information of the first cell to the blacklist:

selecting another cell different from the first cell when detecting that the UE is in idle mode.

12. The method of any of claims 4 to 11, further comprising:

after adding the information of the first cell to the blacklist:

when detecting that the UE is in an RRC connected mode, applying an offset for a blacklist to an actual measurement result of a parameter of the first cell to obtain a processed measurement result, wherein the offset for the blacklist is greater than an offset for de-prioritization, and the parameter of the first cell to be measured is configured by a network; and

sending a measurement report carrying the processed measurement result to the network, wherein the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

13. The method of claim 12, further comprising:

starting a second timer when the measurement report is sent;

stopping the second timer upon detecting that the UE is handed over to another cell or the UE returns to an idle mode before the second timer expires; and

returning to the idle mode for cell selection upon detecting that the UE is not handed over to another cell or does not return to the idle mode before the second timer expires.

14. The method of any of claims 2 to 13, wherein the exception event comprises at least one of: UE idle mode failure, UE service related failure, and UE service performance related failure,

wherein the UE service comprises at least one of: voice calls, data calls, short Message Service (SMS), and supplementary services, the UE service capabilities including at least one of: voice quality and throughput.

15. The method of any of claims 1-14, wherein the information of the first cell comprises at least one of: public Land Mobile Network (PLMN) -related information, tracking Area Code (TAC), cell frequency, physical Cell Identity (PCI), global Cell Identity (GCI), time to add the information of the first cell to the list, duration of a first timer, and number of times the at least one abnormal event occurred.

16. The method of any of claims 1 to 15, further comprising:

prior to adding the information of the first cell in which the UE is camped to the list in response to detecting that the condition is satisfied:

detecting that the signal strength of the first cell is greater than a third threshold.

17. The method of claim 16, wherein each of the different Radio Access Technologies (RATs) corresponds to a third threshold for different RATs of the first cell.

18. The method of any of claims 1 to 17, further comprising:

detecting whether information of a second cell exists in the list; and

selecting a cell according to the list when the information of the second cell is present in the list.

19. A user equipment comprising a processor and a memory for storing one or more programs, wherein the one or more programs are for execution by the processor and comprise instructions for performing the method of any of claims 1-18.

20. A non-transitory computer readable storage medium storing a computer program for Electronic Data Interchange (EDI), which when executed, causes a computer to perform the method of any one of claims 1 to 18.