WO2021244485A1

WO2021244485A1 - Avoiding method against problematic cell and related products

Info

Publication number: WO2021244485A1
Application number: PCT/CN2021/097355
Authority: WO
Inventors: Xin Xu; Yongsheng Shi
Original assignee: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date: 2020-06-01
Filing date: 2021-05-31
Publication date: 2021-12-09
Also published as: CN115552967A

Abstract

An avoiding method against a problematic cell and related products are provided. The avoiding method against a problematic cell includes the following. In response to detecting that a condition is met, information of a first cell, on which a user equipment (UE) camps, is added into a list, where the list is used for the UE to select a cell.

Description

AVOIDING METHOD AGAINST PROBLEMATIC CELL AND RELATED PRODUCTS

TECHNICAL FIELD

This disclosure relates to the field of communication technology, and more particularly to an avoiding method against a problematic cell and related products.

BACKGROUND

With cellular networks evolving from 2G to current 5G, there are always specific locations or cells which cover certain area that could lead to all kinds of communication issues of user equipment (UE) , such as data stall, no service, call drop etc. due to network misconfiguration or network issues, which is non-UE related reasons. This happens more during network evolve from an old generation to a new generation, such as from 4G to 5G currently.

There are some ways, such as retry or airplane mode ON-OFF reset, the UE could do to recovery from such situation. However, if the UE return same places, similar communication issues could occur again as the UE may camp back on a same problematic cell. How to lower the chance to camp on or even avoid those problematic cells completely has been a problem to be solved.

SUMMARY

Implementations provide an avoiding method against a problematic cell and related products, which can lower the chance to camp on or even avoid a problematic cell.

In a first aspect, an avoiding method against a problematic cell is provided. The method includes the following. In response to detecting that a condition is met, information of a first cell, on which a user equipment (UE) camps, is added into a list, where the list is used for the UE to select a cell.

In a second aspect, a UE is provided. The user equipment includes a processor, a memory configured to store one or more programs, where the one or more programs are configured to be executed by the processor, and include instructions for performing some or all 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 configured to store computer programs for electronic data interchange (EDI) . The computer programs include instructions for performing some or all 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 that stores computer programs. The computer programs are operable with a computer to execute some or all operations of the method described in the first aspect.

In implementations of the present disclosure, in response to detecting that a condition is met, information of a first cell, on which a user equipment (UE) camps, is added into a list, where the list is used for the UE to select a cell. As such, before camping on a cell, which may be a problematic cell, with the aid of the list, the UE can select a cell according to the list. In this way, a chance to camp on problematic cells can be lowered or even those problematic cells can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe technical solutions of implementations more clearly, the following will give a brief description of accompanying drawings used for describing the implementations. Apparently, accompanying drawings described below are merely some implementations. Those of ordinary skill in the art can also obtain other accompanying drawings based on the accompanying drawings described below without creative efforts.

FIG. 1 is a schematic flowchart of an avoiding method against a problematic cell according to implementations.

FIG. 2 is a schematic diagram of selecting a cell in LTE network when the UE is in the RRC connected mode according to implementations.

FIG. 3 is a schematic flowchart of an avoiding method against a problematic cell according to other implementations.

FIG. 4 is a schematic flowchart of an avoiding method against a problematic cell according to other implementations.

FIG. 5 is a schematic diagram of an avoiding method against a problematic cell according to other implementations.

FIG. 6 is a schematic structural diagram of an avoiding apparatus against a problematic cell according to implementations.

FIG. 7 is a schematic structural diagram of a user equipment according to implementations.

DETAILED DESCRIPTION

In order for those skilled in the art to better understand technical solutions of implementations, technical solutions of implementations will be described clearly and completely with reference to accompanying drawings in the implementations. Apparently, implementations hereinafter described are merely some implementations, rather than all implementations, of the disclosure. All other implementations obtained by those of ordinary skill in the art based on the implementations herein without creative efforts shall fall within the protection scope of the disclosure.

The terms “first” , “second” , “third” , and the like used in the specification, the claims, and the accompany drawings of the disclosure are used to distinguish different objects rather than describe a particular order. The terms “include” , “include” , and “have” as well as variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus including a series of steps or units is not limited to the listed steps or units. Instead, it can optionally include other steps or units that are not listed; alternatively, other steps or units inherent to the process, method, product, or apparatus can also be included.

The term “implementation” referred to herein means that a particular feature, structure, or character described in conjunction with the implementation may be contained in at least one implementation of the disclosure. The phrase appearing in various places in the specification does not necessarily refer to the same implementation, nor does it refer to an independent or alternative implementation that is mutually exclusive with other implementations. It is explicitly and implicitly understood by those skilled in the art that an implementation described herein may be combined with other implementations.

A user equipment (UE) referred to herein may include various handheld devices, in-vehicle devices, wearable devices, computing devices that have wireless communication functions or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE) , mobile stations (MS) , mobile terminals, and the like. For ease of description, the above-mentioned devices are collectively referred to as a UE.

For ease of better understanding of implementations of the present disclosure, related technology involved in the present disclosure will be briefly introduced below.

Hereinafter, detailed description of implementations of the present disclosure will be given below.

FIG. 1 is a schematic flowchart of an avoiding method against a problematic cell according to implementations. As illustrated in FIG. 1, the avoiding method against a problematic cell includes the following.

At block 102, in response to detecting that a condition is met, information of a first cell, on which a UE camps, is added into a list, where the list is used for the UE to select a cell.

The information of the first cell comprises at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the information of the first cell was added into a list, the duration of a first timer, and the number of times that the at least one abnormal event happens.

The current list may include one of a deprioritizing list and a blacklist. In implementations of the present disclosure, in response to detecting that a condition is met, information of a first cell, on which a user equipment (UE) camps, is added into a list, where the list is used for the UE to select a cell. As such, before camping on a cell, which may be a problematic cell, with the aid of the list, the UE can select a cell according to the list. In this way, a chance to camp on a problematic cell can be lowered or even those problematic cells can be avoided when the UE camps back on a problematic cell.

As an implementation, the condition is detected to be met by detecting at least one abnormal event which happens with the first cell.

The abnormal events may include at least of: UE idle mode failure, UE-service related failure, and UE-service-performance related failure, where the UE-service includes at least one of: voice call, data call, short message service (SMS) , and supplement service, and the UE-service-performance includes at least one of: voice quality and throughout.

As an implementation, the condition is detected to be met as following.

At least one abnormal event which happens with the first cell. The number of times that the at least one abnormal event happens is determined. The number of times that the at least one abnormal event happens is detected to be greater than a threshold.

As an implementation, the list includes the deprioritizing list and the blacklist, and the information of the first cell, on which the UE camps, is added into the list, in response to detecting that the condition is met as follows.

The information of the first cell is added into the deprioritizing list when the number of times that the at least one abnormal event happens is greater than a first threshold. The information of the first cell is added into the blacklist when the number of times is greater than a second threshold, the second threshold being greater than the first threshold.

When the number of times is greater than a first threshold and less than a second threshold, the information of the first cell is added into the deprioritizing list. The information of the first cell includes at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the first cell was added the deprioritizing list, the duration of a first timer T _depri, and the number of times that the at least one abnormal event happens.

When the number of times is greater than the second threshold, the information of the first cell is removed from the deprioritizing list and added into the blacklist. The information of the first cell includes at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the first cell was added the blacklist, the duration of a first timer T _blacklist, and the number of times that the at least one abnormal event happens.

To avoid a situation that random issue could lead to normal cell been deprioritized or blacklisted, a counter C _ab is used to record how many times the at least one abnormal event happened with the first cell. When the number of times that the at least one abnormal event happens is greater than a predefined first threshold Th _ab-dep (threshold for deprioritizing, 2 for example) or Th _ab-bl (threshold for blacklisting, 4 for example) in the cell, next action-deprioritizing/blacklisting the first cell-will be considered. Specifically, the UE can decide the next action (deprioritize or blacklist the first cell) based on the value of C _ab, if it is bigger than Th _ab-dep but less than Th _ab-bl, consider deprioritizing the first cell which is less aggressive, else if bigger than Th _ab-bl, consider blacklisting the first cell.

In order to lower the chance that the UE camps on the first cell again and even avoid the UE from camping on the first cell again, a first level of the action which is deprioritizing the first cell may include the information of the first cell is added into the deprioritizing list and the first cell is deprioritized. A second level of the action which is blacklisting the first cell may include the information of the first cell is added into the blacklist list and the first cell is blacklisted. Reference of how to deprioritize the first cell or blacklist the first cell can also made to following descriptions about operations after adding the information of the first cell into the deprioritizing list or the blacklist. By means of the first level of the action, it will lower a cell selection priority of the first cell and reduce the chance of UE camping on the first cell. By means of the second level of the action, it will exclude the first cell from camping on or handover to.

As such, when the UE first camps on the first cell, if the UE detects that the first cell is a problematic cell, the information of the first cell can be added to deprioritizing list or the blacklist. When the UE returns the same place where the first cell is located, before camping on the first cell, the UE can detect whether the information of the first cell from which the UE can receive a signal exists in the deprioritizing list or the blacklist. When the information of the first cell exists in the deprioritizing list or the blacklist, the UE can select another cell without camping on the first cell, which is a problematic cell. In this way, a chance to camp on a problematic cell can be lowered or even those problematic cells can be avoided when the UE camps back on a problematic cell.

As an implementation, the abnormal events include at least of: UE idle mode failure, UE-service related failure, and UE-service-performance related failure, where the UE-service includes at least one of: voice call, data call, short message service (SMS) , and supplement service, and the UE-service-performance includes at least one of: voice quality and throughout.

The UE Idle mode failure may include at least one of: out of service, limited service, Voice over long-term evolution (VoLTE) /Voice over new radio (VoNR) not registered, frequent service reject, and frequent service lost. The UE-service related failure may include failure about at least one of: voice call (such as circuit switching (CS) , IP Multimedia Subsystem (IMS) , circuit switched fallback (CSFB) ) , data call, short message service (SMS) , and supplement service. The failure about data Call may include no data or unavailable data service. The failure about the SMS or the supplement service may include over signaling or IMS. The UE-service-performance related failure may include poor voice quality (such as CS, VoLTE, VoNR) and low throughput etc.

As an implementation, a first timer is set when the information of the first cell is added into the deprioritizing list or the blacklist. Upon detecting that the first timer expires, the information of the first cell is removed from the deprioritizing list or the blacklist. The duration of the first timer is based on the number of times that the at least one abnormal event happens.

No matter for deprioritizing the cell or for blacklisting the cell, the UE can have a first timer to control how long to deprioritize or blacklist the first cell. The duration of the timer can be set based on C _ab value of the counter. A bigger value of the counter corresponds to a longer duration of the first timer.

Specifically, after the information of the first cell is added into the deprioritizing list List _depri, the information of the first cell will remain in this deprioritizing list until the first timer expires to remember this problematic cell, even if the UE is powered off. UE will remove the information of the first cell from the deprioritizing list List _depri when the first timer T _depri expires and reset all data about the first cell. When the information of the first cell is added into the blacklist List _blacklist, the information of the first cell will remain in this blacklist until the first timer expires to remember this problematic cell, even if the UE is powered off. UE will remove the information of the first cell from the blacklist List _blacklist when the first timer T _blacklist expires.

As an implementation, after the information of the first cell is added into the blacklist, the number of times that the information of the first cell is added to the blacklist is determined within a monitoring period. The duration of the first timer is updated according to the number of times the information of the first cell first cell is added to the blacklist.

Specifically, T _blacklist value will be based on number of times the cell has been added into List _blacklist before within the monitoring period T _mon (which can be a long time, such as days or weeks) . If within the monitoring period T _mon, the cell has been added into the blacklist N times before, the next time the information of the first cell was added into List _blacklist, the T _blacklist value would be (2N+1) *base value (to be defined) . This can further ensure a problematic cell been blacklisted for a longer time. When T _mon passed, all cell data will be reset.

As an implementation, before the information of the first cell is added into the deprioritizing list, whether the information of the first cell exists in the deprioritizing list is determined. Upon detecting that the information of the first cell exists in the deprioritizing list, the information of the first cell is removed from the deprioritizing list and added into the blacklist.

As an implementation, before the at least one abnormal event which happens with the first cell is detected, the UE further detects that signal strength of the first cell is greater than a third threshold.

By detecting that the signal strength of the first cell is greater than the third threshold before the at least one abnormal event which happens with the first cell is detected, issues due to weak coverage or poor signal is excluded. Communication issues due to random problems such as weak coverage or poor signal can be overcome by moving to another place, which is considered in the present application. After detects that the signal strength of the first cell is greater than the third threshold, following operations such as detecting the at least one abnormal event which happens with the first cell and determining the number of times that the at least one abnormal event happens are performed. The third threshold may be a static or dynamic value, which can be determined to truly reflect the signal level when it is lower the third threshold, coverage is weak.

As an implementation, for different radio access technologies (RATs) of the first cell, each of the different RATs correspond to a third threshold. For example, for different radio access technologies (RATs) of the first cell, the third threshold has different values.

For different RATs, such as the second-generation wireless telephone technology (2G) , the third-generation wireless telephone technology (3G) , the fourth-generation mobile communication technology (4G) , and the fifth-generation mobile communication technology (5G) , the third threshold has different values.

As an implementation, after the information of the first cell is added into the deprioritizing list, the UE may further perform the following to lower the chance to reselect the first cell again. A selection priority of the first cell to the lowest is set to the lowest upon detecting that the UE is in an idle mode. An offset is applied to an actual measurement result of a reference signal received power (RSRP) corresponding to the first cell to obtain a processed measurement result. A cell is selected based on the selection priority of the first cell and the processed measurement result.

Specifically, after the information of the first cell is added to the deprioritizing list List _depri for the first time and the UE is in the idle mode, the UE will set a selection priority of the first cell to the lowest and apply an internal offset (Offset _idle, a negative value) to reduce the actual measurement result of the RSRP corresponding to the first cell. As such, during cell measurement in idle mode, the UE will have higher chance to move to other cells not in list List _depri. The Offset _idle can be a fixed value or dynamic value.

In addition, when the UE returns to the same place where the first cell is located and is about to camp on the first cell, though the deprioritizing list or the blacklist, whether the information of the first cell is in the deprioritizing list or the blacklist can be detected. Upon detecting that the information of the first cell is in the deprioritizing list, besides internally setting a cell reselection priority (of cells in the list) to lowest, the UE can also apply the offset to an actual measurement result of the RSRP corresponding to the first cell to obtain the processed measurement result and a cell is selected based on the processed measurement result and the cell reselection priority.

As an implementation, after the information of the first cell is added into the deprioritizing list, the UE may further perform the following to lower the chance to reselect the first cell again. An offset for deprioritizing is applied to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in a radio resource control (RRC) connected mode, where the parameter of the first cell to be measured is configured by a network. A measurement report carrying the processed measurement result is sent to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

Reference can be made to FIG. 2, which is a schematic diagram of selecting another cell in LTE network when the UE is in the RRC connected mode according to implementations. Specifically, when the information of the first cell exists in the deprioritizing list and the UE is in the RRC connected mode, the UE will apply an offset for deprioritizing Offset _conn, to the serving cell measurement result (for non-serving cells in the list as well) . As a result, UE could trigger a measurement report event (defined in 3GPP 36.331 (4G) /38.331 (5G) specification) and sends the measurement report with the processed measurement result to network so network can handover UE to another neighbor cell. The offset for deprioritizing Offset _conn is negative, and can be a fixed value or dynamic value.

As an implementation, after the information of the first cell is added into the blacklist, the UE may further perform the following to prevent the UE from reselecting the first cell again. another cell different from the first cell is selected upon detecting that the UE is in idle mode.

After the current cell has been added into List _blacklist the first time, when the UE is in the idle mode, the UE will immediately trigger cell selection. Any cell in the List _blacklist will be excluded from cell selection candidates unless there are no other cells available.

When the UE returns to the same place where the first cell is located and is about to camp on the first cell, though the deprioritizing list or the blacklist, whether the information of the first cell is in the deprioritizing list or the blacklist can be detected. Upon detecting that the information of the first cell is in the blacklist, the UE will also perform similar operations, that is, cell selection is immediately triggered, and any cell in the List _blacklist will be excluded from cell selection candidates.

As an implementation, after the information of the first cell is added into the blacklist, the UE may further perform the following to prevent the UE from reselecting the first cell again. An offset for backlisting is applied to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in an RRC connected mode, where the offset for backlisting is greater than an offset for deprioritizing, where the parameter of the first cell to be measured is configured by a network. A measurement report carrying the processed measurement result is sent to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

After the current cell has been added into List _blacklist the first time, when the UE is in connected mode, the UE will apply a much bigger negative Penalty Offset value Offset _black to a serving cell measurement result (for non-serving cells in the list as well) , so that the UE could trigger measurement report to network immediately and wait for the network to handover the UE to other cells. When the UE returns to the same place where the first cell is located and is about to camp on the first cell, though the deprioritizing list or the blacklist, whether the information of the first cell is in the deprioritizing list or the blacklist can be detected. Upon detecting that the information of the first cell is in the blacklist, the above same operations will be performed as well.

As an implementation, after a measurement report carrying the processed measurement result is sent to the network, a second timer is set upon sending of the measurement report. Stop 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. Return to the idle mode for cell selection, upon detecting that, before the second timer expires, the UE is not handed over to another or return to the idle mode.

Specifically, after the measurement report is sent out, the UE could start a timer T _handover. If before T _handover expires, the network handover UE to another cell or the UE returns to the idle mode, then stop T _handover. Else when T _handover expires, the UE will locally move to the idle mode then select another cell (not in List _blacklist) to camp on.

Furthermore, if a certain RAT (2G/3G/4G/5G and future RATs) has higher percent of cells causing issue, the above-mentioned same actions can be extended to a problematic RAT. A solution described below is also provided to allow the UE to deprioritize or blacklist the problematic RAT during a period.

For different RATs (such as 2G, 3G, 4G, and 5G) , the UE keeps record of sum of C _ab value from cells in the List _depri for each RAT. If the sum value for the RAT is bigger than Th _ab-deprat (threshold for RAT deprioritizing) but less than Th _ab-blrat (threshold for RAT blacklisting) , consider RAT deprioritizing (i.e., lowering the RAT priority) , else if bigger than Th _ab-blrat then consider RAT blacklisting (i.e., disabling the RAT) . Alternatively, the UE can have a defined timer to control how long to deprioritize or blacklist the RAT. Both actions are only taken when UE is in idle mode.

When the UE decides to deprioritize a problematic RAT for a period (T _deprirat) , the UE will add the information of the RAT into a RAT deprioritizing list (List _deprirat, if it is not there yet) . The RAT related information in List _deprirat would contain at least below: time the RAT was added to List _deprirat, T _deprirat value, C _ab value of the RAT. This list List _deprirat will be kept even after power cycle the UE to remember the problematic RATs. UE will remove the RAT from the list if time T _deprirat passed since the information of the RAT was added.

When the RAT has been added into List _deprirat for the first time and UE is in the idle mode, the UE will internally set the RAT priority to the lowest. As such, the UE is less likely to camp on any cell of the RAT.

When the UE decided to blacklist one problematic RAT for a period (T _blacklistrat) , it will add the RAT information into List _blacklistrat (if it is not there yet) . The RAT related information in List _blacklistrat would contain at least below: time the cell added to List _blacklistrat, T _blacklistrat value, C _ab value of the RAT.

This list will be kept even after power cycle the UE to remember the problematic cells. UE will remove the RAT from the list if time T _blacklistrat passed, and UE will add the RAT back to support list. When the current RAT has been added into List _blacklistrat and the UE is in idle mode, the UE will immediately disable the RAT and trigger cell selection, UE will no longer camp on cell of the RAT.

As an implementation, when the UE comes to a new place or returns the same place where the first cell is located, the UE can detect whether information of a second cell exists in the list. When the information of the second cell exists in the list, a cell is selected according to the list.

When the UE returns the same place where the first cell is located, the second cell may be the same to the first cell.

The list may include a deprioritizing list and a blacklist. Whether the information of the second cell exists in the deprioritizing list or the blacklist can be detected by querying the deprioritizing list or the blacklist based on an identity (ID) of the second cell. The information of the second cell includes at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the target cell was added the deprioritizing list or the blacklist, the duration of a first timer T _depri, and the number of times that the at least one abnormal event happens. The second cell refers to a cell on which the UE is about to camp.

When the information of the second cell exists in the deprioritizing list, upon detecting that the UE is in an idle mode, a selection priority of the second cell to the lowest is set to the lowest, and an offset is applied to an actual measurement result of a RSRP corresponding to the target cell to obtain a processed measurement result. A cell can be selected based on the processed measurement result and the selection priority of the second cell. Upon detecting that the UE is in a RRC connected mode, an offset for deprioritizing is applied to an actual measurement result of a 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, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result. As such, a chance that the UE camps on a problematic cell on which the UE has once camped can be lowered.

When the information of the second cell exists in the blacklist, and upon detecting that the UE is in the RRC connected mode, an offset for backlisting is applied to an actual measurement result of a parameter of the target cell to obtain a processed measurement result. A measurement report carrying the processed measurement result is sent to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result. The offset for backlisting is greater than an offset for deprioritizing. As such, the UE can be prevented from camping on a problematic cell on which the UE has once camped.

Reference can be made to FIG. 3 and FIG. 4, FIG. 3 describe operations when the information of the target cell is added to the deprioritizing list, and FIG. 4 describe operations when the information of the target cell is added to the blacklist.

FIG. 3 is a schematic flowchart of an avoiding method against a problematic cell according to implementations. As illustrated in FIG. 3, the avoiding method against a problematic cell includes the following.

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

At block 204, at least one abnormal event is detected which happens with a target cell on which a UE camps.

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

At block 208, detect a mode of UE, where the mode of the UE includes in idle mode and a radio resource control (RRC) connected mode.

When the UE is different modes, different operations to deprioritize the target cell may be executed. Specifically, upon detecting that the UE is in the idle mode, proceed to operations at block 210; upon detecting that the UE is in the RRC connected mode, proceed to operations at block 212.

At block 210, upon detecting that the UE is in the idle mode, a selection priority of the target cell is set to the lowest, an offset is applied to an actual measurement result of a reference signal received power (RSRP) corresponding to the target cell to obtain a processed measurement result, and a cell is selected based on the processed measurement result.

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

The parameter of the target cell to be measured is 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.

While performing operations to deprioritize the target cell, such as operations at

block

210 and 212, information of the target cell can be also further added to a deprioritizing list. In this way, when the UE returns to the same place where the target cell is located, before camping on the target cell, the UE can detect whether the information of the target cell from which the UE can receive a signal exists in the deprioritizing list or a blacklist, when the information of the target cell exists in the deprioritizing list or the blacklist, the UE can select another cell without camping on the target cell, which is a problematic cell. In this way, a chance to camp on a problematic cell can be lowered or even those problematic cells can be avoided when the UE camps back on a problematic cell.

At block 214, whether information of the target cell exists in the deprioritizing list is determined.

At block 216, when the information of the target cell is determined not to exist in the deprioritizing list, the information of the target cell is added into a deprioritizing list.

The information of the target cell includes at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the target cell was added to the deprioritizing list, the duration of a first timer, and the number of times that the at least one abnormal event happens.

At block 218, the information of the target cell is removed from the deprioritizing list upon detecting that the information of the target cell exists in the deprioritizing list and blacklisting the target cell.

At block 220, when the information of the target cell is determined to exist in the deprioritizing list, the information of the target cell is removed from the deprioritizing list upon detecting that a first timer expires, where the duration of the first timer is based on the number of times that the at least one abnormal event happens.

For details of operations at blocks 202-220, reference can be made to descriptions corresponding to FIG. 1 and FIG. 2, which will not be described herein.

FIG. 4 is a schematic flowchart of an avoiding method against a problematic cell according to implementations. As illustrated in FIG. 4, the avoiding method against a problematic cell includes the following.

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

At block 304, at least one abnormal event is detected which happens with a target cell on which a UE camps.

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

At block 308, detect a mode of the UE.

When the UE is different modes, different operations to deprioritize the target cell may be executed. Specifically, upon detecting that the UE is in the idle mode, proceed to operations at block 310; upon detecting that the UE is in the RRC connected mode, proceed to operations at block 312 and block 318.

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

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

At block 314, a second timer is set upon sending of the measurement report.

At block 316, stop 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.

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

The offset for backlisting is greater than an offset for deprioritizing, the parameter of the target cell to be measured is configured by a network. The measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

While performing operations to blacklist the target cell, such as operations at block 310 to block 318, information of the target cell can be also further added to a blacklist. In this way, when the UE returns to the same place where the target cell is located, before camping on the target cell, the UE can detect whether the information of the target cell from which the UE can receive a signal exists in the deprioritizing list or a blacklist, when the information of the target cell exists in the deprioritizing list or the blacklist, the UE can select another cell without camping on the target cell, which is a problematic cell. In this way, a chance to camp on a problematic cell can be lowered or even those problematic cells can be avoided when the UE camps back on a problematic cell.

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

The information of the target cell includes at least one of: PLMN related information, a TAC, a cell frequency, a PCI, a GCI, time the target cell was added to the deprioritizing list, the duration of a first timer, and the number of times that the at least one abnormal event happens.

At block 322, upon detecting that a first timer expires, the information of the cell from the blacklist is removed.

The duration of the first timer is based on the number of times that the at least one abnormal event happens. In addition, the duration of the first timer can be updated dynamically as follows. The number of times that the target cell is added to the blacklist is determined within a monitoring period. The duration of the first timer is updated according to the number of times the target cell is added to the blacklist.

Reference of descriptions of operations at blocks 302-322 can be made to descriptions corresponding to FIG. 1 and FIG. 2, which will not be described herein.

Reference can be further made to IFG. 5, FIG. 5 is a schematic diagram of an avoiding method against a problematic cell according to other implementations. As illustrated in FIG. 5 and as described in implementations above, the UE detects issues in a cell (represented by a shaded area in FIG. 5) , adds the cell to a deprioritizing list, and then reselects or hands over (represented by an arrow in FIG. 5) to another cell. Alternatively, the UE detects issues in a cell (represented by a shaded area in FIG. 5) , adds the cell to a blacklist, and then reselects or hands over (represented by an arrow in FIG. 5) to another cell.

By means of operations as illustrated in FIG. 3 or FIG. 4, when the UE returns the same place where the target cell is located, before camping on the target cell, the UE can detect whether the information of the target cell from which the UE can receive a signal exists in the deprioritizing list or the blacklist. When the information of the target cell exists in the deprioritizing list or the blacklist, the UE can select another cell without camping on the target cell, which is a problematic cell. In this way, a chance to camp on a problematic cell can be lowered or even those problematic cells can be avoided when the UE camps back on a problematic cell.

The foregoing solution of the implementations of the present disclosure is mainly described from the viewpoint of execution process of the method. It can be understood that, in order to implement the above functions, the UE includes hardware structures and/or software modules corresponding to the respective functions. Those skilled in the art should readily recognize that, in combination with the example units and scheme steps described in the implementations disclosed herein, the present disclosure can be implemented in hardware or a combination of the hardware and computer software. Whether a function is implemented by way of the hardware or hardware driven by the computer software depends on as specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementations should not be considered as beyond the scope of the present disclosure.

According to the implementations of the present disclosure, functional units may be divided for the first wireless earphone in accordance with the foregoing method examples. For example, each functional unit may be divided according to each function, and two or more functions may be integrated in one processing unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional units. It should be noted that the division of units in the implementations is schematic, and is merely a logical function division, and there may be other division manners in actual implementation.

FIG. 6 is a schematic structural diagram of an avoiding apparatus against a problematic cell according to implementations. As illustrated in FIG. 6, the avoiding apparatus against a problematic cell includes an adding unit 402 and a detecting unit 404.

The adding unit 402 is configured to add information of a first cell, on which a user equipment (UE) camps, into a list, in response to the detecting unit 404 detects that a condition is met, wherein the list is used for the UE to select a cell.

As an implementation, the detecting unit 404 is configured to detect at least one abnormal event which happens with the first cell.

As an implementation, the detecting unit 404 is configured to detect at least one abnormal event which happens with the first cell; determine the number of times that the at least one abnormal event happens; detect that the number of times that the at least one abnormal event happens is greater than a threshold.

As an implementation, the list includes a deprioritizing list and a blacklist, and the adding unit 402 is configured to one of: add the information of the first cell into the deprioritizing list when the number of times that the at least one abnormal event happens is greater than a first threshold; or add the information of the first cell into the blacklist when the number of times is greater than a second threshold, the second threshold being greater than the first threshold.

As an implementation, the list includes a deprioritizing list and a blacklist, and the adding unit 402 is configured to: add the information of the first cell into the deprioritizing list when the number of times that the at least one abnormal event happens is greater than a first threshold and less than a second threshold; remove the information of the first cell from the deprioritizing list and add the information of the first cell into the blacklist when the number of times is greater than the second threshold.

As an implementation, the avoiding apparatus against a problematic cell further includes a setting unit 406 and a removing unit 408.

The setting unit 406 is configured to set a first timer when the information of the first cell is added into the deprioritizing list or the blacklist.

The removing unit 408 is further configured to remove the information of the first cell from the deprioritizing list or the blacklist upon detecting that the first timer expires, where the duration of the first timer is based on the number of times that the at least one abnormal event happens

As an implementation, the setting 406 is further configured to determine the number of times that the first cell is added to the blacklist within a monitoring period; update the duration of the first timer according to the number of times the first cell is added to the blacklist.

As an implementation, the adding unit 402 is further configured to, before the information of the first cell is added into the deprioritizing list, determine whether the information of the first cell exists in the deprioritizing list; remove the information of the first cell from the deprioritizing list upon detecting that the information of the first cell exists in the deprioritizing list and blacklisting the first cell.

As an implementation, the avoiding apparatus against a problematic cell further includes a first selecting unit 410. The first selecting unit 410 is configured to after the adding unit 402 adds the information of the first cell into the deprioritizing list, set a selection priority of the first cell to the lowest upon detecting that the UE is in an idle mode, apply an offset to an actual measurement result of a reference signal received power (RSRP) corresponding to the first cell to obtain a processed measurement result; select another cell based on the processed measurement result.

As an implementation, the avoiding apparatus against a problematic cell further includes a second selecting unit 412. The second selecting unit 412: after the adding unit 402 adds the information of the first cell into the deprioritizing list, apply an offset for deprioritizing to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in a radio resource control (RRC) connected mode, where the parameter of the first cell to be measured is configured by a network; send a measurement report carrying the processed measurement result to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

As an implementation, the avoiding apparatus against a problematic cell further includes a third selecting unit 414. The third selecting unit 414: after the adding unit 402 adds the information of the first cell into the blacklist, select another cell different from the first cell upon detecting that the UE is in idle mode.

As an implementation, the avoiding apparatus against a problematic cell further includes a fourth selecting unit 416. The fourth unit 416: after the adding unit 402 adds the information of the first cell into the blacklist, apply an offset for backlisting to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in an RRC connected mode, where the offset for backlisting is greater than an offset for deprioritizing, where the parameter of the first cell to be measured is configured by a network; send a measurement report carrying the processed measurement result to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

As an implementation, the fourth selecting unit 416 is further configured to set a second timer upon sending of the measurement report; stop 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; return to the idle mode for cell selection, upon detecting that, before the second timer expires, the UE is not handed over to another or return to the idle mode.

As an implementation, the abnormal events include at least 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 call, data call, short message service (SMS) , and supplement service, and the UE-service-performance comprises at least one of: voice quality and throughout.

As an implementation, the information of the first cell includes at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the information of the first cell was added the list, the duration of a first timer, and the number of times that the at least one abnormal event happens

As an implementation, the avoiding apparatus against a problematic cell further includes a signal strength detecting unit 418. The signal strength detecting unit 418 is configured to detect that signal strength of the first cell is greater than a third threshold before adding unit 402 adds the information of the first cell, on which the UE camps, into the list, in response to detecting that the condition is met.

As an implementation, for different radio access technologies (RATs) of the first cell, each of the different RATs correspond to a third threshold.

As an implementation, the avoiding apparatus against a problematic cell further includes a fifth selecting unit 420. The fifth selecting unit 420 is configured to detect whether information of a second cell exists in the list; select a cell according to the list when the information of the second cell exists in the list.

As an implementation, the list comprises a deprioritizing list and a blacklist, the fifth selecting configured to select the cell according to the list when the information of the second cell exists in the list is used to one of: select the cell according to the deprioritizing list when the information of the second cell exists in the deprioritizing list; or select the cell according to the blacklist when the information of the second cell exists in the blacklist.

FIG. 7 is a schematic structural diagram of a user equipment (UE) according to implementations. As illustrated in FIG. 7, the UE includes a processor 501, a memory 502, a communication interface 503, and one or more programs 504 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 a condition is met, information of a first cell, on which a user equipment (UE) camps, is added into a list, where the list is used for the UE to select a cell.

As an implementation, in terms of detecting that the condition is met, the one or more programs 504 further include instructions for detecting at least one abnormal event which happens with the first cell.

As an implementation, in terms of detecting that the condition is met, the one or more programs 504 further include instructions for perform the following. At least one abnormal event which happens with a first cell is detected when the UE camps on the first cell. The number of times that the at least one abnormal event happens is determined. The number of times that the at least one abnormal event happens is detected to be greater than a threshold.

As an implementation, the list includes a deprioritizing list and a blacklist, in terms of adding the information of the first cell, on which the UE camps, into the list, in response to detecting that the condition is met, the one or more programs 504 further include instructions for perform one of the following.

The information of the first cell is added into the deprioritizing list when the number of times that the at least one abnormal event happens is greater than a first threshold; or the information of the first cell is added into the blacklist when the number of times is greater than a second threshold, the second threshold being greater than the first threshold.

As an implementation, the list includes a deprioritizing list and a blacklist, in terms of adding the information of the first cell, on which the UE camps, into the list, in response to detecting that the condition is met, the one or more programs 504 further include instructions for perform the following. When the number of times is greater than a first threshold and less than a second threshold, the information of the first cell is added into the deprioritizing list. When the number of times is greater than the second threshold, the information of the first cell is removed from the deprioritizing list and the information of the first cell is added into the blacklist.

As an implementation, the information of the first cell includes at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the first cell was added a current list, the duration of a first timer, and the number of times that the at least one abnormal event happens

As an implementation, the one or more programs 504 further include instructions for performing: setting a first timer when the information of the first cell is added into the deprioritizing list or the blacklist; removing the information of the first cell from the deprioritizing list or the blacklist upon detecting that the first timer expires, where the duration of the first timer is based on the number of times that the at least one abnormal event happens.

As an implementation, the one or more programs 504 further include instructions for perform the following. Whether the information of the first cell exists in the deprioritizing list is detected before the information of the first cell is added into the deprioritizing list. The information of the first cell is removed from the deprioritizing list upon detecting that the information of the first cell exists in the deprioritizing list and the information of the first cell is added into the blacklist.

As an implementation, the one or more programs 504 further include instructions for perform the following. The number of times that the first cell is added to the blacklist within a monitoring period is determined. The duration of the first timer is updated according to the number of times the first cell is added to the blacklist.

As an implementation, the one or more programs 504 further include instructions for performing detecting that signal strength of the first cell is greater than a third threshold before detecting the at least one abnormal event which happens with the first cell.

As an implementation, the one or more programs 504 include instructions for performing the following.

After the information of the first cell is added into the deprioritizing list, a selection priority of the first cell is set to the lowest upon detecting that the UE is in an idle mode. An offset is applied to an actual measurement result of a reference signal received power (RSRP) corresponding to the first cell to obtain a processed measurement result. A cell is selected based on the processed measurement result.

After the information of the first cell is added into the deprioritizing list, an offset for deprioritizing is applied to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in a radio resource control (RRC) connected mode, where the parameter of the first cell to be measured is configured by a network; a measurement report carrying the processed measurement result is sent to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

As an implementation, the one or more programs 504 further include instructions for perform selecting another cell different from the first cell upon detecting that the UE is in idle mode after the information of the first cell is added into the blacklist.

As an implementation, the one or more programs 504 further include instructions for perform the following. After the information of the first cell is added into the blacklist, an offset for backlisting is added to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in an RRC connected mode, where the offset for backlisting is greater than an offset for deprioritizing, where the parameter of the first cell to be measured is configured by a network. A measurement report carrying the processed measurement result is sent to the network, where the measurement report is used for the network to handover the UE to another cell based on the processed measurement result.

As an implementation, the one or more programs 504 further include instructions for perform the following. A second timer is set upon sending of the measurement report. stop 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. Return to the idle mode for cell selection, upon detecting that, before the second timer expires, the UE is not handed over to another or return to the idle mode.

As an implementation, the one or more programs 504 further include instructions for perform the following. Whether information of a second cell exists in the list is detected. A cell according to the list is selected when the information of the second cell exists in the list.

As an implementation, the list includes a deprioritizing list and a blacklist, and the one or more programs 504 further include instructions for perform one of the following. the cell is selected according to the deprioritizing list when the information of the second cell exists in the deprioritizing list. The cell is selected 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 configured to store programs which, when executed, are operable to execute some or all operations of the method for rendering a virtual object based on illumination estimation or some or all operations of the avoiding method against a problematic cell as described in the above-described method implementations.

A computer program product is also provided. The computer program product includes a non-transitory computer-readable storage medium that stores computer programs. The computer programs are operable with a computer to execute some or all operations of the method for rendering a virtual object based on illumination estimation or some or all operations of the avoiding method against a problematic cell as described in the above-described method implementations.

It is to be noted that, for the sake of simplicity, the foregoing method implementations are described as a series of action combinations. However, it will be appreciated by those skilled in the art that the present disclosure is not limited by the sequence of actions described. According to the present disclosure, certain steps or operations may be performed in other order or simultaneously. Besides, it will be appreciated by those skilled in the art that the implementations described in the specification are exemplary implementations and the actions and modules involved are not necessarily essential to the present disclosure.

In the foregoing implementations, the description of each implementation has its own emphasis. For the parts not described in detail in an implementation, reference may be made to related descriptions in other implementations.

In the implementations of the present disclosure, it is to be noted that, the apparatus disclosed in implementations provided herein may be implemented in other manners. For example, the device/apparatus implementations described above are merely illustrative; for instance, the division of the unit is only a logical function division and there can be other manners of division during actual implementations; for example, multiple units or components may be combined or may be integrated into another system, or some features may be ignored, omitted, or not performed. In addition, coupling or communication connection between each illustrated or discussed component may be direct coupling or communication connection, may be indirect coupling or communication among devices or units via some interfaces, and may be electrical connection, mechanical connection, or other forms of connection.

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

In addition, the functional units in various implementations of the present disclosure may be integrated into one processing unit, or each unit may be physically present, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or a software function unit.

The integrated unit may be stored in a computer-readable memory when it is implemented in the form of a software functional unit and is sold or used as a separate product. Based on such understanding, the technical solutions of the present disclosure essentially, or the part of the technical solutions that contributes to the related art, or all or part of the technical solutions, may be embodied in the form of a software product which is stored in a memory and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, and so on) to perform all or part of the steps described in the various implementations of the present disclosure. The memory includes various medium capable of storing program codes, such as a USB (universal serial bus) flash disk, a read-only memory (ROM) , a random access memory (RAM) , a removable hard disk, Disk, compact disc (CD) , or the like.

It will be noted by those of ordinary skill in the art that all or a part of the various methods of the implementations described above may be accomplished by means of a program to instruct associated hardware, where the program may be stored in a computer-readable memory, which may include a flash memory, a read-only memory (ROM) , a random-access memory (RAM) , a disk or a compact disc (CD) , and so on.

The implementations of the present disclosure are described in detail above, specific examples are used herein to describe the principle and implementation manners of the present disclosure. The description of the above implementations is merely used to help understand the method and the core idea of the present disclosure. Meanwhile, those skilled in the art may make modifications to the specific implementation manners and the application scope according to the idea of the present disclosure. In summary, the contents of the specification should not be construed as limiting the present disclosure.

Claims

An avoiding method against a problematic cell, comprising:

adding information of a first cell, on which a user equipment (UE) camps, into a list, in response to detecting that a condition is met, wherein the list is used for the UE to select a cell.
The method of claim 1, wherein detecting that the condition is met comprises:

detecting at least one abnormal event which happens with the first cell.
The method of claim 1, wherein detecting that the condition is met comprises:

detecting at least one abnormal event which happens with the first cell;

determining the number of times that the at least one abnormal event happens; and

detecting that the number of times that the at least one abnormal event happens is greater than a threshold.
The method of claim 3, wherein the list comprises a deprioritizing list or a blacklist, and adding the information of the first cell, on which the UE camps, into the list, in response to detecting that the condition is met comprises one of:

adding the information of the first cell into the deprioritizing list when the number of times that the at least one abnormal event happens is greater than a first threshold; or

adding the information of the first cell into the blacklist when the number of times is greater than a second threshold, the second threshold being greater than the first threshold.
The method of the claim 3, wherein the list comprises a deprioritizing and a blacklist, and adding the adding the information of the first cell, on which the UE camps, into the list, in response to detecting that the condition is met comprises:

adding the information of the first cell into the deprioritizing list when the number of times that the at least one abnormal event happens is greater than a third threshold and less than a fourth threshold; and

removing the information of the first cell from the deprioritizing list and adding the information of the first cell into the blacklist when the number of times is greater than the fourth threshold.
The method of claim 4 or 5, further comprising:

setting a first timer when the information of the first cell is added into the deprioritizing list or the blacklist; and

removing the information of the first cell from the deprioritizing list or the blacklist upon detecting that the first timer expires, wherein the duration of the first timer is based on the number of times that the at least one abnormal event happens.
The method of any of claim 4 to 6, further comprising:

determining the number of times that the information of the first cell is added to the 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.
The method of any of claims 4 to 7, further comprising:

before adding the information of the first cell into the deprioritizing list:

determining whether the information of the first cell exists in the deprioritizing list; and

removing the information of the first cell from the deprioritizing list upon detecting that the information of the first cell exists in the deprioritizing list and adding the information of the first cell into the blacklist.
The method of any of claims 4 to 8, further comprising:

after adding the information of the first cell into the deprioritizing list:

setting a selection priority of the first cell to the lowest upon detecting that the UE is in an idle mode;

applying an offset to an actual measurement result of a reference signal received power (RSRP) corresponding to the first cell to obtain a processed measurement result; and

selecting a cell based on the selection priority of the first cell and the processed measurement result.
The method of any of claims 4 to 9, further comprising:

after adding the information of the first cell into the deprioritizing list:

applying an offset for deprioritizing to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in a radio resource control (RRC) connected mode, 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 handover the UE to a cell based on the processed measurement result.
The method of any of claims 4 to 10, further comprising:

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

selecting another cell different from the first cell upon detecting that the UE is in idle mode.
The method of any of claims 4 to 11, further comprising:

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

applying an offset for backlisting to an actual measurement result of a parameter of the first cell to obtain a processed measurement result upon detecting that the UE is in an RRC connected mode, wherein the offset for backlisting is greater than an offset for deprioritizing, 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 handover the UE to another cell based on the processed measurement result.
The method of claim 12, further comprising:

setting a second timer upon sending of the measurement report;

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, before the second timer expires, the UE is not handed over to another or return to the idle mode.
The method of any of claims 2 to 13, wherein the abnormal events comprise at least 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 call, data call, short message service (SMS) , and supplement service, and the UE-service-performance comprises at least one of: voice quality and throughout.
The method of any of claims 1 to 14, wherein the information of the first cell comprises at least one of: public land mobile network (PLMN) related information, a tracking area code (TAC) , a cell frequency, a physical cell identity (PCI) , a global cell identity (GCI) , time the information of the first cell was added the list, the duration of a first timer, and the number of times that the at least one abnormal event happens.
The method of any of claims 1 to 15, further comprising:

before adding the information of the first cell, on which the UE camps, into the list, in response to detecting that the condition is met:

detecting that signal strength of the first cell is greater than a third threshold.
The method of claim 16, wherein for different radio access technologies (RATs) of the first cell, each of the different RATs correspond to a third threshold.
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 exists in the list.
A user equipment comprising a processor, a memory configured to store one or more programs, wherein the one or more programs are configured to be executed by the processor, and comprise instructions for performing the method of any of claims 1 to 18.
A non-transitory computer-readable storage medium configured to store computer programs for electronic data interchange (EDI) which, when executed, are operable with a computer to perform the method of any of claims 1 to 18.