WO2020156065A1 - 小区重选的方法及装置、存储介质、用户终端 - Google Patents

小区重选的方法及装置、存储介质、用户终端 Download PDF

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Publication number
WO2020156065A1
WO2020156065A1 PCT/CN2020/070856 CN2020070856W WO2020156065A1 WO 2020156065 A1 WO2020156065 A1 WO 2020156065A1 CN 2020070856 W CN2020070856 W CN 2020070856W WO 2020156065 A1 WO2020156065 A1 WO 2020156065A1
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Prior art keywords
cell
value
reselection
previous
target cells
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PCT/CN2020/070856
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English (en)
French (fr)
Inventor
韩立锋
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展讯通信（上海）有限公司
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Priority to US17/427,836 priority Critical patent/US20220141737A1/en
Priority to EP20748263.9A priority patent/EP3920593A4/en
Publication of WO2020156065A1 publication Critical patent/WO2020156065A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the present invention relates to the field of communication technology, and in particular to a method and device for cell reselection, a storage medium, and a user terminal.
  • the 3rd Generation Partnership Project (The 3rd Generation Partnership Project, 3GPP) standards organization will study how to deploy fifth-generation mobile communications (The Fifth-Generation Mobile Communications, 5G) New Radio (New Radio for short) on unlicensed spectrum.
  • 5G Fifth-Generation Mobile Communications
  • 5G New Radio
  • NR New Radio for short
  • the unlicensed spectrum needs to be used in the manner of Listen-Before-Talk (LBT for short).
  • LBT Listen-Before-Talk
  • the user equipment (User Equipment, UE for short) state includes the Radio Resource Control-Idle (Radio Resource Control-Idle, RRC-IDLE) state, the RRC inactive (RRC-Inactive) state, and the RRC connected (RRC) state.
  • RRC-IDLE Radio Resource Control-Idle
  • RRC-Inactive RRC inactive
  • RRC connected RRC
  • -Connected The UE enters the RRC connected state from the RRC idle state, and needs to perform the RRC connection establishment (RRC connection establishment), and enters the RRC connection state from the RRC inactive state requires the RRC connection resume process (RRC connection resume).
  • the UE can perform cell reselection in the RRC-IDLE state or the RRC-Inactive state, and reselect to a more suitable cell, such as a cell with better signal quality or a cell with higher priority.
  • LBT continuous failure due to the sharing of unlicensed spectrum, the problem of continuous LBT failure may occur. Specifically, when the UE performs an LBT operation, when the number of consecutive LBT failures exceeds a preset threshold, or the number of consecutive LBT failures exceeds another within a preset period of time. A preset threshold is called LBT continuous failure. In the prior art, when consecutive LBT failures occur and the number of times exceeds the preset number threshold, the UE will reselect to another cell through the cell.
  • the technical problem solved by the present invention is to provide a method and device for cell reselection, a storage medium, and a user terminal, which can reduce the possibility of reselecting back to the previous cell.
  • the embodiment of the present invention provides a method for cell reselection, which includes the following steps: if the number of consecutive LBT failures in the previous cell exceeds a preset number of thresholds, stay in the current serving cell; When cell reselection is needed, reduce the value of at least one reselection parameter of the previous cell, and determine the set of target cells according to the reselection parameter value of each cell; sort the target cells in the set; select and sort sequentially In the previous target cell, cell reselection is performed; wherein, the lower the value of the reselection parameter of the target cell, the lower the probability of being selected.
  • the reselection parameter value includes a cell selection reception level value and a cell selection quality value
  • the determining a set of target cells according to the reselection parameter value of each cell includes: determining a cell selection reception level value and a cell selection quality value Cells that are all greater than zero are used as the set of the target cells.
  • the cell when the cell is the previous cell, determining that the cell selection reception level value of the previous cell is the value obtained by subtracting the first temporary offset from the initial cell selection reception level value; and/ Or, when the cell is the previous cell, it is determined that the cell selection quality value of the previous cell is a value obtained by subtracting the second temporary offset from the initial cell selection quality value.
  • the reselection parameter value further includes an R value
  • sorting the target cells in the set includes: determining the R value of each target cell in the set, wherein, when the target cell in the set includes When there is the previous cell, determine that the R value of the previous cell is the value obtained by subtracting the third temporary offset from the initial R value; sort the target cells according to the R value; wherein, The higher the R value, the higher the ranking.
  • R n Q meas,n -Q offset -Q offsettemp3 ;
  • R n represents the R value of the previous cell
  • Q meas,n represents the RSRP measurement value of the previous cell
  • Q offset represents the offset value
  • Q offsettemp3 represents the third temporary offset.
  • the following formula is used to determine the cell selection reception level value and the cell selection quality value of the previous cell:
  • S rxlev represents the reception level value of the previous cell selection
  • P represents the measured reception level value of the previous cell selection
  • X represents the reception level value threshold of the previous cell selection
  • Q offsettemp1 represents the first temporary offset Shift
  • S qual represents the previous cell selection quality value
  • Q represents the measured previous cell selection quality value
  • Y represents the previous cell selection quality value threshold
  • Q offsettemp2 represents the second temporary offset .
  • the reselection parameter value includes frequency priority
  • determining the set of target cells according to the reselection parameter value of each cell includes: determining the frequency priority of each cell to be selected; according to the frequency priority of the cell to be selected Level, determine the set of target cells.
  • the method for cell reselection further includes: among all the cells to be selected, determining a candidate located on the frequency according to the frequency of the current serving cell The cell is used as the first candidate cell; the frequency priority of the first candidate cell located on the frequency is reduced by a preset level.
  • determining the set of target cells includes: according to the order of the frequency priority from high to low, determining whether there is a signal quality of the cell to be selected in advance. It is assumed that the preset quality threshold is exceeded within the time period until it is determined that a frequency priority has one or more second candidate cells whose signal quality exceeds the preset quality threshold within the preset time period; the second candidate cell is used as the A set of target cells; wherein, when the previous cell is included in the candidate cell, it is determined that the preset duration of the previous cell is greater than the preset duration of other cells in the candidate cell, and/or , Determining that the preset quality threshold of the previous cell is greater than the preset quality thresholds of other cells in the candidate cell.
  • the reselection parameter value further includes an R value
  • sorting the target cells in the set includes: determining the R value of each target cell in the set; and performing the R value on each target cell according to the R value. Sorting; wherein, the higher the R value, the higher the sorting.
  • the following formula is used to determine the preset quality threshold of the previous cell:
  • Thresh Thresh x +Q offsettemp4 ;
  • Thresh Thresh x +Q offsettemp5 ;
  • Thresh represents the preset quality threshold of the previous cell
  • Thresh x represents the initial preset quality threshold of the previous cell
  • Q offsettemp4 represents the fourth temporary offset
  • Q offsettemp5 represents the fifth temporary offset.
  • the previous cell is a serving cell that has camped on within a preset time period.
  • an embodiment of the present invention provides a cell reselection device, which includes the following steps: a handover module, adapted to stay in the current service if the number of consecutive LBT failures in the previous cell exceeds the preset number threshold A cell; a determining module, adapted to reduce at least one reselection parameter value of the previous cell when the current serving cell requires cell reselection, and determine a set of target cells according to the reselection parameter value of each cell; a sorting module, It is suitable for sorting the target cells in the set; the reselection module is suitable for sequentially selecting the target cells that are ranked first for cell reselection; wherein, the lower the value of the reselection parameter of the target cell, the selected The lower the chance.
  • an embodiment of the present invention provides a storage medium on which computer instructions are stored, and the steps of the above cell reselection method are executed when the computer instructions are run.
  • an embodiment of the present invention provides a user terminal, including a memory and a processor, the memory stores computer instructions that can run on the processor, and when the processor runs the computer instructions Perform the steps of the above method for cell reselection.
  • the present invention if the number of consecutive LBT failures in the previous cell exceeds the preset number of thresholds, it will stay in the current serving cell; when the current serving cell needs to perform cell reselection, reduce the at least A reselection parameter value, and a set of target cells is determined according to the reselection parameter value of each cell; the target cells in the set are sorted; the target cells that are ranked first are sequentially selected to perform cell reselection.
  • the value of at least one reselection parameter of the previous cell is reduced by setting, and the set of target cells is determined according to the reselection parameter value of each cell, and then cell reselection is performed.
  • the UE All cells are reselected under the same conditions, which makes it easy to reselect back to the previous cell.
  • Using the solution of the embodiment of the present invention can reduce the possibility of reselecting back to the previous cell.
  • a cell whose cell selection reception level value and cell selection quality value are both greater than zero can be determined as the target cell. Collection, and by reducing the cell selection reception level value and cell selection quality value of the previous cell, the possibility of reselecting back to the previous cell can be further reduced.
  • the reselection parameter value may include frequency priority, and the frequency priority of each cell to be selected may be determined, and based on the cell to be selected To determine the set of target cells, select the target cell from the highest possible frequency priority. Since high-priority cells tend to have higher communication quality, the determination of appropriate cells can be further improved Accuracy.
  • the preset duration of the previous cell may be increased, and/or the preset quality threshold of the previous cell may be increased to reduce the amount of the previous cell exceeding the preset quality threshold within the preset duration. In this way, the possibility of reselecting back to the previous cell can be further reduced.
  • the frequency priority of the first candidate cell may be lowered by a preset number Therefore, it is not easy to select other candidate cells on the frequency where the current serving cell is located, which helps to further improve the accuracy of determining the appropriate cell.
  • the R value of the previous cell can be reduced, so that the previous cell is ranked more backward in each target cell, thereby further reducing the possibility of reselecting the previous cell.
  • Figure 1 is a flowchart of a method for cell reselection in an embodiment of the present invention
  • FIG. 2 is a flowchart of a specific implementation of step S12 in FIG. 1;
  • FIG. 3 is a flowchart of a specific implementation of step S22 in FIG. 2;
  • Figure 4 is a schematic structural diagram of a cell reselection device in an embodiment of the present invention.
  • the unlicensed spectrum is used in the LBT manner.
  • the unlicensed spectrum technology used by the NR system is also known as the New RAT Un-license (NR-U) technology.
  • NR-U New RAT Un-license
  • a clear channel assessment can be performed before the communication between the sender and the receiver. If the evaluation result is that the channel is idle, the data is sent immediately; otherwise, data cannot be transmitted until the end of the next fixed frame period.
  • the fixed frame is composed of a channel occupation time (Channel Occupancy Time, COT) and an idle period (Idle Period), where the channel occupation time is 1 millisecond (millisecond, abbreviated as ms) to 10 ms, and the minimum idle period is the channel occupation time Of 5%.
  • the threshold of the number of consecutive failures of the LBT (also called the threshold) and the time threshold may be configured on the network side, and the terminal may be notified through a dedicated message or a public message.
  • the dedicated message may, for example, use Radio Resource Control (Radio Resource Control, RRC) signaling
  • the public message for example, may use System Information Block (SIB) to notify the terminal.
  • RRC Radio Resource Control
  • SIB System Information Block
  • the problem of continuous LBT failure may occur.
  • the network side configures the threshold of the number of consecutive LBT failures to be 8 times, then the LBT fails 8 times continuously, which can be regarded as the occurrence of consecutive LBT failures.
  • the time threshold T1 and the number threshold can be set for the LBT continuous failure, for example, 10s and 8 times, then the LBT fails 8 times continuously within 10s, which can be regarded as the occurrence of LBT continuous failure.
  • the inventor of the present invention has discovered through research that in the prior art, especially after continuous LBT failures occur, the UE can camp on a more suitable cell by performing cell reselection, cell selection, and RRC reestablishment procedures, such as signal Cells with better quality, cells with less interference, cells with lighter load, or cells with higher priority.
  • cell reselection cell selection, and RRC reestablishment procedures, such as signal Cells with better quality, cells with less interference, cells with lighter load, or cells with higher priority.
  • the UE needs to perform cell reselection in the serving cell where the UE is camping, the cell is selected for cell reselection from all the optional serving cells including the previous cell, and it is easy to reselect the previous cell. In turn, it is easy to cause the problem of continuous LBT failure again.
  • the terminal stays in the current serving cell; when the current serving cell needs to perform cell reselection, reduce the at least one of the previous cell A reselection parameter value, and a set of target cells is determined according to the reselection parameter value of each cell; the target cells in the set are sorted; the target cells that are ranked first are sequentially selected to perform cell reselection.
  • the value of at least one reselection parameter of the previous cell is reduced by setting, and the set of target cells is determined according to the reselection parameter value of each cell, and then cell reselection is performed.
  • the UE All cells are reselected under the same conditions, which makes it easy to reselect back to the previous cell.
  • Using the solution of the embodiment of the present invention can reduce the possibility of reselecting back to the previous cell.
  • Fig. 1 is a flowchart of a method for cell reselection in an embodiment of the present invention.
  • the cell reselection method may be used on the UE side, and may include step S11 to step S14:
  • Step S11 If the number of consecutive LBT failures in the previous cell exceeds the preset threshold, the terminal camps on the current serving cell;
  • Step S12 When the current serving cell needs to perform cell reselection, reduce at least one reselection parameter value of the previous cell, and determine the set of target cells according to the reselection parameter value of each cell;
  • Step S13 Sort the target cells in the set
  • Step S14 sequentially select the target cells ranked first, and perform cell reselection.
  • step S11 the terminal initiates uplink transmission, which includes the transmission of data and signaling. If a continuous LBT failure event occurs, the number of consecutive LBT failures is counted to determine whether a continuous LBT failure has occurred event.
  • the preset threshold for the number of times may be sent to the UE by the network side, or may be predefined through a protocol. Furthermore, if the number of consecutive failures of the LBT exceeds the preset number threshold, the UE can camp on the current serving cell through procedures such as cell reselection, cell selection, and RRC reestablishment.
  • the previous cell may not be limited to the last camping cell before the UE switches to the current serving cell, but may also be any camping cell before the UE switches to the current serving cell, that is, in the present invention
  • the previous cell in which the number of consecutive LBT failures exceeds the preset number threshold may be used to indicate any cell where the LBT has consecutive failures before the UE switches to the current serving cell.
  • the camping cell is a serving cell where the terminal receives a communication service in the RRC-IDLE state or the RRC-Inactive state or the RRC-connected state.
  • the communication service refers to the terminal receiving the camping service in the RRC-IDLE state or the RRC-Inactive state.
  • System information, paging messages, etc. of the staying cell, or the terminal performs operations such as sending and receiving data or signaling with the base station of the staying cell in the RRC-connected state.
  • step S12 when the current serving cell needs to perform cell reselection, although the set of target cells will be determined among all available serving cells including the previous cell where the LBT continuous failure has occurred, Decreasing the value of at least one reselection parameter of the previous cell can reduce the probability of the previous cell being selected.
  • the target cell may be a cell that helps to improve communication quality after reselection, for example, a cell with better signal quality or a cell with higher priority.
  • the target cells may be cells of the same frequency or inter-frequency cells of the same frequency priority.
  • the reselection parameter value may include a cell selection reception level value and a cell selection quality value
  • the step of determining a set of target cells according to the reselection parameter value of each cell may include: determining a cell selection reception level value and a cell selection quality value Cells that are all greater than zero are used as the set of the target cells.
  • the lower the selection reception level value and/or the cell selection quality value of the target cell the less likely it is to be greater than zero, that is, the lower the reselection parameter value, the lower the probability of being selected.
  • the present invention in the case of cells with the same frequency or inter-frequency cells with the same priority, it is possible to determine cells whose cell selection reception level value and cell selection quality value are both greater than zero, as the set of the target cells, It is helpful for the preliminary screening of the signal quality of the target cell to further improve the accuracy of determining the appropriate cell.
  • the cell selection reception level value of the previous cell is the value obtained by subtracting the first temporary offset from the initial cell selection reception level value; and/or
  • the cell selection quality value of the previous cell is a value obtained by subtracting the second temporary offset from the initial cell selection quality value.
  • a cell whose cell selection reception level value and cell selection quality value are both greater than zero can be determined as the set of the target cells, and by reducing the value of the previous cell The cell selection reception level value and cell selection quality value can further reduce the possibility of reselecting back to the previous cell.
  • S rxlev represents the previous cell selection reception level value (Cell selection RX level value)
  • P represents the measured previous cell selection reception level value
  • X represents the previous cell selection reception level value threshold
  • Q offsettemp1 represents the first temporary offset
  • S qual represents the previous cell selection quality value
  • Q represents the measured previous cell selection quality value
  • Y represents the previous cell selection
  • Q offsettemp2 represents the second temporary offset.
  • the Q offsettemp1 and Q offsettemp2 can be configured by the network side for the UE, so that by setting the Q offsettemp1 and Q offsettemp2 , the cell selection reception level value and the cell selection quality value of the previous cell can be flexibly adjusted to help the UE In the cell reselection, tilt to a more appropriate target cell. Further, by setting larger Q offsettemp1 and Q offsettemp2 for the previous cell, it also helps to increase the difficulty for the UE to choose to camp on the previous cell, so that This reduces the probability that the UE fails to establish an RRC connection in the previous cell.
  • step S13 the UE may sort the target cells in the set.
  • the reselection parameter value also includes an R value
  • the step of sorting the target cells in the set may include: determining the R value of each target cell in the set, wherein when the target cell in the set When the cell includes the previous cell, it is determined that the R value of the previous cell is the value obtained by subtracting the third temporary offset from the initial R value; and sorting the target cells according to the R value; wherein , The higher the R value, the higher the ranking.
  • the R value of the previous cell can be reduced, so that the previous cell is ranked more backward in each target cell, thereby further reducing the possibility of reselecting the previous cell.
  • R n Q meas,n -Q offset -Q offsettemp3 ;
  • R n represents the R value of the previous cell
  • Q meas,n represents the RSRP measurement value of the previous cell
  • Q offset represents the offset value
  • Q offsettemp3 represents the third temporary offset.
  • the Q offsettemp3 can be configured by the network side for the UE, so that by setting the Q offsettemp3 , the R value of each target cell can be flexibly adjusted, which helps make the UE tilt toward a more appropriate target cell during cell reselection.
  • step S14 the UE may sequentially select the target cells ranked first to perform cell reselection.
  • the target cells may all be inter-frequency or inter-system cells, where different frequencies have different priorities.
  • FIG. 2 is a flowchart of a specific implementation of step S12 in FIG. 1.
  • the reselection parameter value may include frequency priority
  • the step of determining the set of target cells according to the reselection parameter value of each cell may include step S21 to step S22, and each step is described below.
  • step S21 the frequency priority of each cell to be selected is determined.
  • the cells to be selected are inter-frequency or inter-system cells, they may have different frequency priorities.
  • step S22 the set of target cells is determined according to the frequency priority of the cell to be selected.
  • a frequency priority can be determined in a step-by-step manner according to the order of the frequency priority from high to low.
  • At the frequency priority at least one cell can satisfy the signal quality in advance. Set the condition that exceeds the preset quality threshold within the time period to meet the reselection requirements.
  • Fig. 3 is a flowchart of a specific implementation of step S22 in Fig. 2.
  • the step of determining the set of target cells according to the frequency priority of the cell to be selected may include step S31 to step S32, and each step is described below:
  • step S31 it is determined step by step whether the signal quality of the cell to be selected exceeds a preset quality threshold within a preset time period, until it is determined that a frequency priority has one or more A second candidate cell whose signal quality exceeds a preset quality threshold within a preset period of time; wherein, when the candidate cell includes the previous cell, it is determined that the preset duration of the previous cell is greater than all The preset duration of other cells in the candidate cell, and/or it is determined that the preset quality threshold of the previous cell is greater than the preset quality threshold of other cells in the candidate cell.
  • the preset duration of the previous cell may be increased, and/or the preset quality threshold of the previous cell may be increased to reduce the amount of the previous cell exceeding the preset quality threshold within the preset duration. In this way, the possibility of reselecting back to the previous cell can be further reduced.
  • the following formula is used to determine the preset quality threshold of the previous cell:
  • Thresh Thresh x +Q offsettemp4 ;
  • Thresh Thresh x +Q offsettemp5 ;
  • Thresh represents the preset quality threshold of the previous cell
  • Thresh x represents the initial preset quality threshold of the previous cell
  • Q offsettemp4 represents the fourth temporary offset
  • Q offsettemp5 represents the fifth temporary offset.
  • the initial preset quality threshold of the previous cell may be used to indicate the threshold condition for the previous cell to be selected as a candidate cell.
  • RSRP Reference Signal Receiving Power
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal Receiving Power
  • the Q offsettemp4 and Q offsettemp5 can be configured by the network side for the UE, so that by setting the Q offsettemp5 , the preset quality threshold that each target cell needs to meet can be flexibly adjusted, which will help the UE to make the cell reselection More appropriate target cell tilt, further reducing the possibility of reselecting back to the previous cell.
  • step S32 the second candidate cell is used as the set of target cells.
  • the second candidate cell may be one or more candidate cells on the same frequency priority.
  • a frequency priority can be determined in a step-by-step manner according to the order of the frequency priority from high to low.
  • At the frequency priority at least one cell can satisfy the signal quality in advance. Set the condition that exceeds the preset quality threshold within the time period to meet the reselection requirements. And by increasing the preset duration of the previous cell and/or the preset quality threshold of the previous cell, it helps to make the UE tilt towards a more appropriate target cell during cell reselection, and further reduce the need to reselect to the previous cell. possibility.
  • the UE may further sort the target cells in the set.
  • the reselection parameter value further includes an R value
  • the step of sorting the target cells in the set may include: determining the R value of each target cell in the set; The cells are sorted; wherein, the higher the R value, the higher the sorting.
  • the R value of the previous cell can be reduced, so that the previous cell is ranked more backward in each target cell, thereby further reducing the possibility of reselecting the previous cell.
  • R n Q meas,n -Q offset -Q offsettemp3 ;
  • R n represents the R value of the previous cell
  • Q meas,n represents the RSRP measurement value of the previous cell
  • Q offset represents the offset value
  • Q offsettemp3 represents the third temporary offset.
  • the Q offsettemp3 can be configured by the network side for the UE, so that by setting the Q offsettemp3 , the R value of each target cell can be flexibly adjusted, which helps make the UE tilt toward a more appropriate target cell during cell reselection.
  • the UE may sequentially select the target cells that are ranked first to perform cell reselection.
  • the reselection parameter value may include frequency priority, and the frequency priority of each candidate cell may be determined, and the frequency priority of each candidate cell may be determined according to the frequency of the candidate cell.
  • the priority is to determine the set of the target cells, so as to select the target cell in the highest possible frequency priority, so that the network side can implement operations such as load balancing and improve the overall performance of the system.
  • the previous cell may be a serving cell that has camped on within a preset time period.
  • the UE can choose to use them during reselection. Otherwise, the cells that have experienced continuous LBT failures can no longer be selected, and because of excessive restrictions, the UE's selection is reduced. range.
  • the previous cell as a serving cell that has camped on for a preset period of time, it is possible to avoid the continuous failure of LBT that occurred too long ago to affect the current UE reselection, thereby reducing the UE’s current Restrictions during serving cell reselection, thereby improving communication quality.
  • the frequency priority of the first candidate cell may be lowered.
  • the UE can obtain the absolute priority of different frequencies or Radio Access Technologies (RAT) through system information or RRC signaling, or reselect to NR from other RATs. It inherits the absolute priority configured in the original RAT.
  • RAT Radio Access Technologies
  • the method for cell reselection may further include: among all cells to be selected, determining the cell to be selected on the frequency according to the frequency of the previous cell, and As the first candidate cell; the frequency priority of the first candidate cell located on the frequency is lowered by a preset level.
  • all candidate cells on the frequencies of the unlicensed spectrum may be used as the first candidate cells.
  • the candidate cell located on the same frequency as the previous cell may also be prone to continuous LBT failure. It is not recommended to continue to select this type of cell (i.e., the first standby cell). Selected cell) as the reselected cell.
  • Q offsettemp6 may be used to represent the preset level, where Q offsettemp6 may also be referred to as a sixth temporary offset.
  • the effective duration T2 may be set for the Q offsettemp6 , so as to degrade the first candidate cell only within a certain period of time, so as to avoid the impact of long-term degradation.
  • the T2 may start timing from the occurrence of N consecutive LBT failures, or start timing when the UE initiates cell selection or cell reselection.
  • the value of at least one reselection parameter of the previous cell is reduced by setting, and the set of target cells is determined according to the reselection parameter value of each cell, and then the cell reselection is performed.
  • the UE uses the same conditions to reselect all cells, which results in easy reselection to the previous cell.
  • Using the solution of the embodiment of the present invention can reduce the possibility of reselecting to the previous cell.
  • the frequency priority of the first candidate cell is lowered by a preset level.
  • the consecutive occurrence of the number of consecutive LBT failures in the multiple cells on the same frequency exceeding the preset number threshold means that the consecutive occurrence of the number of consecutive LBT failures in multiple cells on the same frequency exceeds the preset number of times Threshold, where M is configured by the network side.
  • FIG. 4 is a schematic structural diagram of a cell reselection apparatus in an embodiment of the present invention.
  • the cell reselection apparatus may include:
  • the handover module 41 is adapted to camp in the current serving cell if the number of consecutive LBT failures in the previous cell exceeds the preset number threshold;
  • the determining module 42 is adapted to reduce at least one reselection parameter value of the previous cell when the current serving cell requires cell reselection, and determine a set of target cells according to the reselection parameter value of each cell;
  • the sorting module 43 is adapted to sort the target cells in the set
  • the reselection module 44 is adapted to sequentially select the target cells ranked first to perform cell reselection; wherein, the lower the reselection parameter value of the target cell, the lower the probability of being selected.
  • the value of at least one reselection parameter of the previous cell is reduced by setting, and the set of target cells is determined according to the reselection parameter value of each cell, and then the cell reselection is performed.
  • the UE uses the same conditions to reselect all cells, which results in easy reselection to the previous cell.
  • Using the solution of the embodiment of the present invention can reduce the possibility of reselecting to the previous cell.
  • the embodiment of the present invention also provides a storage medium on which computer instructions are stored, and the computer instructions execute the steps of the above cell reselection method when the computer instructions are run.
  • the storage medium may be a computer-readable storage medium, for example, it may include a non-volatile memory (non-volatile) or a non-transitory (non-transitory) memory, and may also include an optical disk, a mechanical hard disk, a solid state hard disk, and the like.
  • the embodiment of the present invention also provides a user terminal, including a memory and a processor, the memory stores computer instructions that can run on the processor, and the processor executes the cell resetting when the computer instructions are executed. The steps of the selected method.
  • the user terminal includes, but is not limited to, terminal devices such as mobile phones, computers, and tablet computers.
  • the embodiments of the present disclosure are applicable to 5G NR communication systems, 4G and 3G communication systems, and various new communication systems in the future, such as 6G and 7G.
  • the present embodiment is also applicable to different network architectures, including but not limited to communication architectures such as relay network architecture, dual link architecture, vehicle-to-everything (Vehicle-to-Everything), and V2X.
  • communication architectures such as relay network architecture, dual link architecture, vehicle-to-everything (Vehicle-to-Everything), and V2X.
  • the network side described in the embodiment of the present invention may include core network equipment, where the core network may be an evolved packet core (EPC), 5G Core Network (5G core network), or future communications
  • the new core network in the system may be an evolved packet core (EPC), 5G Core Network (5G core network), or future communications
  • the 5G Core Network consists of a set of devices, and implements access and mobility management functions (Access and Mobility Management Function, AMF) for functions such as mobility management, and provides functions such as packet routing and forwarding and QoS (Quality of Service) management.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • SMF Session Management Function
  • EPC can be composed of MME that provides functions such as mobility management and gateway selection, Serving Gateway (S-GW) that provides functions such as packet forwarding, and PDN Gateway (P-GW) that provides functions such as terminal address allocation and rate control.
  • S-GW Serving Gateway
  • P-GW PDN Gateway
  • the network side in the embodiment of the present invention may refer to a base station (Base Station, BS for short) of a radio access network.
  • the base station may also be called a base station equipment, which is a type of equipment deployed on a radio access network (RAN) to provide Communication function device.
  • RAN radio access network
  • the equipment that provides the base station function in the 2G network includes a base transceiver station (English: base transceiver station, referred to as BTS), the equipment that provides the base station function in the 3G network includes the NodeB (NodeB), and the equipment that provides the base station function in the 4G network Including evolved NodeB (evolved NodeB, eNB), in wireless local area networks (WLAN), the equipment that provides base station functions is access point (AP), 5G New Radio (New Radio) , Referred to as NR) in the device gNB that provides base station functions, and the evolving Node B (ng-eNB), where the gNB and the terminal use NR technology for communication, and the ng-eNB and the terminal use E-UTRA (Evolved Universal Terrestrial Radio Access) technology for communication, both gNB and ng-eNB can be connected to the 5G core network.
  • the base station in the embodiment of the present application also includes equipment that provides base station functions in a new communication system in the future.
  • the network side in the embodiment of the present invention may also include a base station controller of a wireless access network, which is a device for managing base stations, such as a base station controller (BSC) in a 2G network, and a wireless network in a 3G network.
  • BSC base station controller
  • a network controller radio network controller, RNC for short
  • RNC radio network controller
  • the user terminal in the embodiment of the present invention may refer to various forms of UE, access terminal, user unit, user station, mobile station, mobile station (Mobile Station, MS for short), remote station, remote terminal, mobile device, user terminal , Terminal equipment (terminal equipment), wireless communication equipment, user agent or user device.
  • UE access terminal
  • user unit user station
  • mobile station mobile station
  • mobile station Mobile Station, MS for short
  • remote station remote terminal
  • mobile device user terminal
  • Terminal equipment terminal equipment
  • wireless communication equipment user agent or user device.
  • the terminal equipment can also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), Handheld devices with wireless communication functions, computing devices, or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (Public Land Mobile Network, referred to as The terminal equipment in the PLMN) is not limited in the embodiment of the present invention.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the “plurality” in the embodiments of the present invention refers to two or more.
  • connection appearing in the embodiment of the present invention refers to various connection modes such as direct connection or indirect connection to realize communication between devices, which is not limited in the embodiment of the present invention.
  • the processor may be a central processing unit (Central Processing Unit, CPU for short), and the processor may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP for short), and dedicated integration Circuit (Application Specific Integrated Circuit, referred to as ASIC), ready-made programmable gate array (Field Programmable Gate Array, referred to as FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (Read-Only Memory, ROM for short), a programmable read-only memory (Programmable ROM, PROM for short), and an erasable programmable read-only memory (Erasable PROM, EPROM for short). , Electrically erasable programmable read-only memory (Electrically EPROM, EEPROM for short) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM for short), which is used as an external cache.
  • Random Access Memory Random Access Memory
  • static random access memory SRAM for short
  • dynamic random access memory Dynamic Random Access Memory
  • DRAM synchronous dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • Enhanced SDRAM ESDRAM for short
  • SLDRAM Synchronous connection to DRAM
  • DR-RAM Direct Rambus RAM
  • the foregoing embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions or computer programs.
  • the computer instructions or computer programs are loaded or executed on the computer, the processes or functions according to the embodiments of the present invention are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium.
  • the semiconductor medium may be a solid state drive.
  • the size of the sequence number of the foregoing processes does not mean the order of execution.
  • the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed method, device, and system can be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each embodiment of the present invention may be integrated into one processing unit, or each unit may be separately physically included, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be realized in the form of hardware, or in the form of hardware plus software functional unit.
  • the above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium.
  • the above-mentioned software function unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute some steps of the method described in each embodiment of the present invention.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical disks, etc., which can store program codes Medium.

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Abstract

一种小区重选的方法及装置、存储介质、用户终端，所述方法包括：在前一小区如果LBT连续失败次数超出预设次数阈值后，则驻留在当前服务小区；在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；对所述集合内的目标小区进行排序；依次选择排序在前的目标小区，进行小区重选。本发明方案可以降低重选回前一小区的可能性。

Description

小区重选的方法及装置、存储介质、用户终端
本申请要求于2019年1月31日提交中国专利局、申请号为201910098419.8、发明名称为“小区重选的方法及装置、存储介质、用户终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，尤其涉及一种小区重选的方法及装置、存储介质、用户终端。
背景技术
第三代合作伙伴项目(The 3rd Generation Partnership Project，简称3GPP)标准组织将研究在非授权频谱上如何部署第五代移动通信(The Fifth-Generation mobile communications，简称5G)新无线(New Radio，简称NR)系统，从而达到公平、有效地利用非授权频谱，提高NR系统的数据传输速率的目的。
对于非授权频谱的使用，不同国家有着不同管制方式。例如，需通过先听后说操作(Listen-Before-Talk，简称LBT)的方式使用非授权频谱。
在5G NR通信系统中，用户设备(User Equipment，简称UE)状态包括无线资源控制空闲(Radio Resource Control-Idle，简称RRC-IDLE)态、RRC非活动(RRC-Inactive)态和RRC连接(RRC-Connected)态。UE从RRC空闲态进入RRC连接态，需要进行RRC连接建立(RRC connection establishment)，从RRC非活动态进入RRC连接态需要进行RRC连接继续过程(RRC connection  resume)过程。其中，UE在RRC-IDLE态、RRC-Inactive态可进行小区重选，重选到更合适的小区，例如信号质量更好的小区或优先级更高的小区。
然而，由于存在共享非授权频谱的情况，可能会发生LBT连续失败的问题，具体而言，UE执行LBT操作，当LBT连续失败次数超过预设阈值，或者预设时长内LBT连续失败次数超过另一预设阈值时，被称为LBT连续失败。在现有技术中，发生LBT连续失败且次数超出预设次数阈值时，UE会通过小区重选至另一小区。
然而，在现有技术中，当UE需要再次进行小区重选时，容易重选回前一小区，导致再次发生LBT连续失败的问题。
发明内容
本发明解决的技术问题是提供一种小区重选的方法及装置、存储介质、用户终端，可以降低重选回前一小区的可能性。
为解决上述技术问题，本发明实施例提供一种小区重选的方法，包括以下步骤：在前一小区如果LBT连续失败次数超出预设次数阈值后，驻留在当前服务小区；在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；对所述集合内的目标小区进行排序；依次选择排序在前的目标小区，进行小区重选；其中，所述目标小区的重选参数值越低，被选中的几率越低。
可选的，所述重选参数值包括小区选择接收水平值以及小区选择质量值，所述根据各个小区的重选参数值确定目标小区的集合包括：确定小区选择接收水平值以及小区选择质量值均大于零的小区，以作为所述目标小区的集合。
可选的，当所述小区为所述前一小区时，确定所述前一小区的小区选择接收水平值为初始小区选择接收水平值减去第一临时偏移量 之后得到的值；和/或，当所述小区为所述前一小区时，确定所述前一小区的小区选择质量值为初始小区选择质量值减去第二临时偏移量之后得到的值。
可选的，所述重选参数值还包括R值，对所述集合内的目标小区进行排序包括：确定所述集合内各个目标小区的R值，其中，当所述集合内的目标小区包含有所述前一小区时，确定所述前一小区的R值为初始R值减去第三临时偏移量之后得到的值；根据所述R值，对各个目标小区进行排序；其中，所述R值越高，排序越前。
可选的，采用下述公式，确定所述前一小区的R值：
R n＝Q meas,n-Q offset-Q offsettemp3；
其中，R n表示所述前一小区的R值，Q meas,n表示所述前一小区的RSRP测量值，Q offset表示偏置值，Q offsettemp3表示第三临时偏移量。
可选的，采用下述公式，确定所述前一小区的小区选择接收水平值以及小区选择质量值：
S rxlev＝P-X-Q offsettemp1；
S qual＝Q-Y-Q offsettemp2；
其中，S rxlev表示所述前一小区选择接收水平值，P表示测量到的所述前一小区选择接收水平值，X表示所述前一小区选择接收水平值门限，Q offsettemp1表示第一临时偏移量，S qual表示所述前一小区选择质量值，Q表示测量到的所述前一小区选择质量值，Y表示所述前一小区选择质量值门限，Q offsettemp2表示第二临时偏移量。
可选的，所述重选参数值包括频率优先级，根据各个小区的重选参数值确定目标小区的集合包括：确定每个待选小区的频率优先级；根据所述待选小区的频率优先级，确定所述目标小区的集合。
可选的，在确定每个待选小区的频率优先级之前，所述小区重选的方法还包括：在所有待选小区中，根据当前服务小区所在的频率确 定位于所述频率上的待选小区，以作为第一待选小区；对位于所述频率上的第一待选小区的频率优先级降低预设级别等级。
可选的，根据所述待选小区的频率优先级，确定所述目标小区的集合包括：依照所述频率优先级自高至低的顺序，逐级确定是否存在待选小区的信号质量在预设时长内超出预设质量阈值，直至确定一个频率优先级具有一个或多个信号质量在预设时长内超出预设质量阈值的第二待选小区；将所述第二待选小区作为所述目标小区的集合；其中，当所述待选小区中包含有所述前一小区时，确定所述前一小区的预设时长大于所述待选小区中其他小区的预设时长，和/或，确定所述前一小区的预设质量阈值大于所述待选小区中其他小区的预设质量阈值。
可选的，所述重选参数值还包括R值，对所述集合内的目标小区进行排序包括：确定所述集合内各个目标小区的R值；根据所述R值，对各个目标小区进行排序；其中，所述R值越高，排序越前。
可选的，当所述第二待选小区的频率优先级高于所述当前服务小区的频率优先级时，采用下述公式，确定所述前一小区的预设质量阈值：
Thresh＝Thresh x+Q offsettemp4；
或者，当所述第二待选小区的频率优先级低于所述当前服务小区的频率优先级时，采用下述公式，确定所述前一小区的预设质量阈值：
Thresh＝Thresh x+Q offsettemp5；
其中，Thresh表示所述前一小区的预设质量阈值，Thresh x表示所述前一小区的初始预设质量阈值，Q offsettemp4表示第四临时偏移量，Q offsettemp5表示第五临时偏移量。
可选的，所述前一小区为预设时长内驻留过的服务小区。
为解决上述技术问题，本发明实施例提供一种小区重选的装置， 包括以下步骤：切换模块，适于在前一小区如果LBT连续失败次数超出预设次数阈值后，则驻留在当前服务小区；确定模块，适于在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；排序模块，适于对所述集合内的目标小区进行排序；重选模块，适于依次选择排序在前的目标小区，进行小区重选；其中，所述目标小区的重选参数值越低，被选中的几率越低。
为解决上述技术问题，本发明实施例提供一种存储介质，其上存储有计算机指令，所述计算机指令运行时执行上述小区重选的方法的步骤。
为解决上述技术问题，本发明实施例提供一种用户终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机指令，所述处理器运行所述计算机指令时执行上述小区重选的方法的步骤。
与现有技术相比，本发明实施例的技术方案具有以下有益效果：
在本发明实施例中，在前一小区如果LBT连续失败次数超出预设次数阈值后，则驻留在当前服务小区；在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；对所述集合内的目标小区进行排序；依次选择排序在前的目标小区，进行小区重选。采用上述方案，通过设置降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合，然后进行小区重选，相比于现有技术中，UE采用相同条件对所有的小区进行重选，导致容易重选回前一小区，采用本发明实施例的方案，可以降低重选回前一小区的可能性。
进一步，在本发明实施例中，针对同频小区或同频率优先级的异频小区的情况，可以确定小区选择接收水平值以及小区选择质量值均大于零的小区，以作为所述目标小区的集合，并且通过降低前一小区 的小区选择接收水平值以及小区选择质量值，可以进一步降低重选回前一小区的可能性。
进一步，在本发明实施例中，针对异频或异系统小区的情况，所述重选参数值可以包括频率优先级，可以确定每个待选小区的频率优先级，并根据所述待选小区的频率优先级，确定所述目标小区的集合，从而在尽可能高的频率优先级中选取目标小区，由于高优先级的小区往往具有更高的通信质量，因此可以进一步提高确定适当的小区的准确率。
进一步，在本发明实施例中，可以通过提高前一小区的预设时长，和/或，通过提高前一小区的预设质量阈值，降低前一小区在预设时长内超出预设质量阈值的程度，从而可以进一步降低重选回前一小区的可能性。
进一步，在本发明实施例中，针对异频或异系统小区的情况，还可以在所述LBT连续失败次数超出预设次数阈值时，对第一待选小区的频率优先级降低预设级别数，从而不容易选取到当前服务小区所在的频率上的其他待选小区，有助于进一步提高确定适当的小区的准确率。
进一步，在本发明实施例中，可以通过降低前一小区的R值，使得前一小区在各个目标小区中排序更趋于后面，从而进一步降低重选回前一小区的可能性。
附图说明
图1是本发明实施例中一种小区重选的方法的流程图；
图2是图1中步骤S12的一种具体实施方式的流程图；
图3是图2中步骤S22的一种具体实施方式的流程图；
图4是本发明实施例中一种小区重选的装置的结构示意图。
具体实施方式
在现有技术中，通过LBT的方式使用非授权频谱，其中，NR系统使用非授权频谱技术也称为新无线接入免授权(New RAT Un-license，简称NR-U)技术。
具体而言，采用LBT过程，可以在收发双方通信之前，进行干净信道评估(Clear Channel Assessment，简称CCA)。如果评估结果为信道空闲，那么立即发送数据；否则直到下一个固定帧周期结束前，均不能传输数据。所述固定帧是由信道占用时间(Channel Occupancy Time，简称COT)和空闲周期(Idle Period)组成的，其中信道占用时间为1毫秒(millisecond，简称ms)到10ms，最小空闲周期为信道占用时间的5％。
其中，LBT连续失败次数的阈值(又称为门限)和时间阈值，可以是网络侧配置的，可通过专用消息或公共消息通知终端。所述专用消息例如可以采用无线资源控制(Radio Resource Control，RRC)信令，所述公共消息例如可以采用系统信息(System Information Block，SIB)通知终端。
在具体实施中，可能出现LBT连续失败的问题，例如网络侧配置LBT连续失败次数的阈值为8次，则LBT连续失败8次，可以称之为发生了LBT连续失败。可以理解的是，可以为所述LBT连续失败设置时间阈值T1以及次数阈值，例如为10s及8次，则LBT在10s内连续失败8次，可以称之为发生了LBT连续失败。
本发明的发明人经过研究发现，在现有技术中，尤其在发生LBT连续失败后，UE可以通过进行小区重选、小区选择、RRC重建立等程序，驻留到更合适的小区，例如信号质量更好的小区、干扰更小的小区、负荷较轻的小区、或优先级更高的小区。然而，当UE在驻留的服务小区需要进行小区重选时，是在包含前一小区在内的全部可选服务小区中选择小区进行小区重选的，也就容易重选回前一小区，进而容易导致再次发生LBT连续失败的问题。
在本发明实施例中，在前一小区如果LBT连续失败次数超出预设次数阈值后，终端驻留在当前服务小区；在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；对所述集合内的目标小区进行排序；依次选择排序在前的目标小区，进行小区重选。采用上述方案，通过设置降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合，然后进行小区重选，相比于现有技术中，UE采用相同条件对所有的小区进行重选，导致容易重选回前一小区，采用本发明实施例的方案，可以降低重选回前一小区的可能性。
为使本发明的上述目的、特征和有益效果能够更为明显易懂，下面结合附图对本发明的具体实施例做详细的说明。
参照图1，图1是本发明实施例中一种小区重选的方法的流程图。所述小区重选的方法可以用于UE侧，可以包括步骤S11至步骤S14：
步骤S11：在前一小区如果LBT连续失败次数超出预设次数阈值，则终端驻留到当前服务小区；
步骤S12：在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；
步骤S13：对所述集合内的目标小区进行排序；
步骤S14：依次选择排序在前的目标小区，进行小区重选。
其中，所述目标小区的重选参数值越低，被选中的几率越低。
在步骤S11的具体实施中，终端发起上行的传输，其中包含数据和信令的发送，，如果发生连续LBT失败的事件，则对LBT连续失败的次数进行统计，以判断是否发生了LBT连续失败的事件。
更具体而言，如果LBT连续失败次数超出预设次数阈值，则可 以判断为发生了LBT连续失败的事件。其中，所述预设次数阈值可以是网络侧发送至UE的，还可以是通过协议预定义的。进而如果所述LBT连续失败次数超出预设次数阈值后，UE可以通过进行小区重选、小区选择、RRC重建立等程序，驻留至当前服务小区。
需要指出的是，所述前一小区可以不限制为UE换至当前服务小区之前的最后一个驻留小区，还可以为UE换至当前服务小区之前的任意一个驻留小区，也即在本发明实施例中，所述LBT连续失败次数超出预设次数阈值的前一小区可以用于指示在UE换至当前服务小区之前，发生了LBT连续失败的任意一个驻留小区。所述驻留小区，终端在RRC-IDLE态或RRC-Inactive态或RRC-connected态接收通信服务的服务小区，所述通信服务是指终端在RRC-IDLE态或RRC-Inactive态接收所述驻留小区的系统信息、寻呼消息等，或者终端在RRC-connected态与所述驻留小区的基站进行数据或信令的收发操作等操作。
在步骤S12的具体实施中，在当前服务小区需要进行小区重选时，虽然会在包含有发生了LBT连续失败的前一小区在内的全部可选服务小区中确定目标小区的集合，然而通过降低所述前一小区的至少一个重选参数值，可以减小前一小区被选中的几率。
其中，所述目标小区的重选参数值越低，被选中的几率越低。
其中，所述目标小区可以是有助于在重选后提高通信质量的小区，例如为信号质量更好的小区或优先级更高的小区。
在本发明实施例的一种具体实施方式中，所述目标小区可以均为同频小区或者同一频率优先级的异频小区。
所述重选参数值可以包括小区选择接收水平值以及小区选择质量值，所述根据各个小区的重选参数值确定目标小区的集合的步骤可以包括：确定小区选择接收水平值以及小区选择质量值均大于零的小区，以作为所述目标小区的集合。
需要指出的是，所述目标小区的选择接收水平值和/或小区选择质量值越低，越不容易大于零，也即重选参数值越低，被选中的几率越低。
在本发明实施例中，针对同频小区或具备相同优先级的异频小区的情况，可以确定小区选择接收水平值以及小区选择质量值均大于零的小区，以作为所述目标小区的集合，有助于对目标小区的信号质量进行初步筛查，以进一步提高确定适当的小区的准确率。
进一步地，当所述小区为所述前一小区时，确定所述前一小区的小区选择接收水平值为初始小区选择接收水平值减去第一临时偏移量之后得到的值；和/或，当所述小区为所述前一小区时，确定所述前一小区的小区选择质量值为初始小区选择质量值减去第二临时偏移量之后得到的值。
在本发明实施例中，针对同频小区的情况，可以确定小区选择接收水平值以及小区选择质量值均大于零的小区，以作为所述目标小区的集合，并且通过降低所述前一小区的小区选择接收水平值以及小区选择质量值，可以进一步降低重选回前一小区的可能性。
更进一步地，可以采用下述公式，确定所述目标小区的小区选择接收水平值以及小区选择质量值：
S rxlev＝P-X-Q offsettemp1；
S qual＝Q-Y-Q offsettemp2；
其中，S rxlev表示所述前一小区选择接收水平值(Cell selection RX level value)，P表示测量到的所述前一小区选择接收水平值，X表示所述前一小区选择接收水平值门限，Q offsettemp1表示第一临时偏移量，S qual表示所述前一小区选择质量值(Cell selection quality value)，Q表示测量到的所述前一小区选择质量值，Y表示所述前一小区选择质量值门限，Q offsettemp2表示第二临时偏移量。
其中，所述Q offsettemp1以及Q offsettemp2可以由网络侧为UE配置，从而通 过设置所述Q offsettemp1以及Q offsettemp2，灵活调整前一小区的小区选择接收水平值以及小区选择质量值，有助于使得UE在小区重选时向更适当的目标小区倾斜，进一步地，通过为前一小区设置较大的Q offsettemp1以及Q offsettemp2，还有助于提高UE选择驻留在前一小区的难度，从而在一定程度上降低了UE在前一小区中RRC连接建立失败的概率。
在步骤S13中，UE可以对所述集合内的目标小区进行排序。
具体地，所述重选参数值还包括R值，对所述集合内的目标小区进行排序的步骤可以包括：确定所述集合内各个目标小区的R值，其中，当所述集合内的目标小区包含有所述前一小区时，确定所述前一小区的R值为初始R值减去第三临时偏移量之后得到的值；根据所述R值，对各个目标小区进行排序；其中，所述R值越高，排序越前。
需要指出的是，所述前一小区的R值越低，排序越后，越不容易被选中，也即重选参数值越低，被选中的几率越低。
在本发明实施例中，可以通过降低前一小区的R值，使得前一小区在各个目标小区中排序更趋于后面，从而进一步降低重选回前一小区的可能性。
进一步地，可以采用下述公式，确定所述前一小区的R值：
R n＝Q meas,n-Q offset-Q offsettemp3；
其中，R n表示所述前一小区的R值，Q meas,n表示所述前一小区的RSRP测量值，Q offset表示偏置值，Q offsettemp3表示第三临时偏移量。
其中，所述Q offsettemp3可以由网络侧为UE配置，从而通过设置所述Q offsettemp3，灵活调整每个目标小区的R值，有助于使得UE在小区重选时向更适当的目标小区倾斜。
在步骤S14中，UE可以依次选择排序在前的目标小区，进行小区重选。
在本发明实施例中，通过确定目标小区的集合，并对所述集合内的目标小区进行排序，可以确定适当的小区进行小区重选，从而提高小区重选的成功率，进而成功发起RRC连接建立或RRC恢复请求。
在本发明实施例的另一种具体实施方式中，所述目标小区可以均为异频或异系统小区，其中不同频率的优先级不同。
参照图2，图2是图1中步骤S12的一种具体实施方式的流程图。其中，所述重选参数值可以包括频率优先级，根据各个小区的重选参数值确定目标小区的集合的步骤可以包括步骤S21至步骤S22，以下对各个步骤进行说明。
在步骤S21中，确定每个待选小区的频率优先级。
具体地，由于所述待选小区为异频或异系统小区，因此可以具有不同的频率优先级。
在步骤S22中，根据所述待选小区的频率优先级，确定所述目标小区的集合。
在本发明实施例中，通过依照所述频率优先级自高至低的顺序，逐级确定的方式，可以确定一个频率优先级，在该频率优先级上，至少具有一个小区满足信号质量在预设时长内超出预设质量阈值的条件，满足重选需求。
参照图3，图3是图2中步骤S22的一种具体实施方式的流程图。所述根据所述待选小区的频率优先级，确定所述目标小区的集合的步骤可以包括步骤S31至步骤S32，以下对各个步骤进行说明：
在步骤S31中，依照所述频率优先级自高至低的顺序，逐级确定是否存在待选小区的信号质量在预设时长内超出预设质量阈值，直至确定一个频率优先级具有一个或多个信号质量在预设时长内超出预设质量阈值的第二待选小区；其中，当所述待选小区中包含有所述前一小区时，确定所述前一小区的预设时长大于所述待选小区中其他小区的预设时长，和/或，确定所述前一小区的预设质量阈值大于所述 待选小区中其他小区的预设质量阈值。
具体地，由于高频率优先级的小区往往具有更好的通信质量，因此依照所述频率优先级自高至低的顺序，更容易确定到质量好的小区作为重选小区。进一步，在本发明实施例中，可以通过提高前一小区的预设时长，和/或，通过提高前一小区的预设质量阈值，降低前一小区在预设时长内超出预设质量阈值的程度，从而可以进一步降低重选回前一小区的可能性。
进一步地，当所述第二待选小区的频率优先级高于所述当前服务小区的频率优先级时，采用下述公式，确定所述前一小区的预设质量阈值：
Thresh＝Thresh x+Q offsettemp4；
或者，
当所述第二待选小区的频率优先级低于所述当前服务小区的频率优先级时，采用下述公式，确定所述前一小区的预设质量阈值：
Thresh＝Thresh x+Q offsettemp5；
其中，Thresh表示所述前一小区的预设质量阈值，Thresh x表示所述前一小区的初始预设质量阈值，Q offsettemp4表示第四临时偏移量，Q offsettemp5表示第五临时偏移量。
其中，所述前一小区的初始预设质量阈值可以用于指示所述前一小区被选择为候选小区的阈值条件。
需要指出的是，在具体实施中，可以根据多种参数确定某一小区是否能够被选择为候选小区，例如采用参考信号接收功率(Reference Signal Receiving Power，RSRP)或参考信号接收质量(Reference Signal Receiving Quality，RSRQ)等参数进行确定，则所述Thresh x对应地为前一小区的RSRP或RSRQ的阈值。
其中，所述Q offsettemp4以及Q offsettemp5可以由网络侧为UE配置，从而通 过设置所述Q offsettemp5，灵活调整每个目标小区需要满足的预设质量阈值，有助于使得UE在小区重选时向更适当的目标小区倾斜，进一步降低重选回前一小区的可能性。
在步骤S32中，将所述第二待选小区作为所述目标小区的集合。
具体地，所述第二待选小区可以为同一频率优先级上的一个或多个待选小区。
在本发明实施例中，通过依照所述频率优先级自高至低的顺序，逐级确定的方式，可以确定一个频率优先级，在该频率优先级上，至少具有一个小区满足信号质量在预设时长内超出预设质量阈值的条件，满足重选需求。并且通过增加前一小区的预设时长，和/或前一小区的预设质量阈值，有助于使得UE在小区重选时向更适当的目标小区倾斜，进一步降低重选回前一小区的可能性。
在具体实施中，根据所述待选小区的频率优先级，确定所述目标小区的集合之后，进一步地，UE可以对所述集合内的目标小区进行排序。
具体地，所述重选参数值还包括R值，对所述集合内的目标小区进行排序的步骤可以包括：确定所述集合内各个目标小区的R值；根据所述R值，对各个目标小区进行排序；其中，所述R值越高，排序越前。
需要指出的是，所述前一小区的R值越低，排序越后，越不容易被选中，也即重选参数值越低，被选中的几率越低。
在本发明实施例中，可以通过降低前一小区的R值，使得前一小区在各个目标小区中排序更趋于后面，从而进一步降低重选回前一小区的可能性。
进一步地，可以采用下述公式，确定所述前一小区的R值：
R n＝Q meas,n-Q offset-Q offsettemp3；
其中，R n表示所述前一小区的R值，Q meas,n表示所述前一小区的RSRP测量值，Q offset表示偏置值，Q offsettemp3表示第三临时偏移量。
其中，所述Q offsettemp3可以由网络侧为UE配置，从而通过设置所述Q offsettemp3，灵活调整每个目标小区的R值，有助于使得UE在小区重选时向更适当的目标小区倾斜。
在具体实施中，对所述集合内的目标小区进行排序之后，进一步地，UE可以依次选择排序在前的目标小区，进行小区重选。
在本发明实施例中，针对异频或异系统小区的情况，所述重选参数值可以包括频率优先级，可以确定每个待选小区的频率优先级，并根据所述待选小区的频率优先级，确定所述目标小区的集合，从而在尽可能高的频率优先级中选取目标小区，从而网络侧可以实现负荷均衡等操作，提升系统整体性能。
在本发明实施例中，通过确定目标小区的集合，并对所述集合内的目标小区进行排序，可以确定适当的小区进行小区重选，从而提高小区重选的成功率，进而成功发起RRC连接建立或RRC恢复请求。
进一步地，所述前一小区可以为预设时长内驻留过的服务小区。
具体而言，对于过久之前发生LBT连续失败的小区，UE可以在重选时选择使用，否则容易导致发生过LBT连续失败的小区再也无法被选用，进而由于限制过多，降低UE的选择范围。
在本发明实施例中，通过设置所述前一小区为预设时长内驻留过的服务小区，可以避免过久之前发生LBT连续失败的情况对当前UE重选产生影响，从而降低UE在当前服务小区重选时的限制，进而提高通信质量。
需要指出的是，在本发明实施例中，针对异频或异系统小区的情况，还可以在所述LBT连续失败次数超出预设次数阈值时，对第一待选小区的频率优先级降低预设级别等级。
具体地，UE在小区选择和小区重选时，可以通过系统信息或RRC信令获取不同频率或无线接入技术(Radio Access Technologies，RAT)的绝对优先级，或者从其他RAT中重选到NR时继承原RAT中配置的绝对优先级。
在确定每个待选小区的频率优先级之前，所述小区重选的方法还可以包括：在所有待选小区中，根据前一小区所在的频率确定位于所述频率上的待选小区，以作为第一待选小区；对位于所述频率上的第一待选小区的频率优先级降低预设级别等级。
优选地，可将所有非授权频谱的频率上的待选小区，作为第一待选小区。
在具体实施中，如果前一小区发生LBT连续失败，则与前一小区位于相同频率上的待选小区可能也容易发生LBT连续失败的情况，则不建议继续选择这类小区(即第一待选小区)作为重选小区。
在本发明实施例中，针对异频或异系统小区的情况，其中不同频率的优先级不同，还可以在所述LBT连续失败次数超出预设次数阈值时，通过对第一待选小区进行降级，有助于在后续依照频率优先级顺序逐级确定第二待选小区时，从而不容易选取到前一小区所在的频率上的其他待选小区，有助于进一步提高确定适当的小区的准确率。
其中，可以采用Q offsettemp6表示所述预设级别等级，其中，所述Q offsettemp6又可以称为第六临时偏移量。
优选地，可以为所述Q offsettemp6设置有效时长T2，以仅在一定的时间内对第一待选小区进行降级，以避免长期降级带来的影响。
其中，所述T2可以从发生了N次连续LBT失败的事件开始计时，或者从UE发起小区选择或小区重选开始计时。
在本发明实施例中，通过设置降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合，然后进行小区重选，相比于现有技术中，UE采用相同条件对所有的小区进 行重选，导致容易重选回前一小区，采用本发明实施例的方案，可以降低重选回前一小区的可能性。
优选地，在同一频率上的多个小区连续发生所述LBT连续失败次数超出预设次数阈值时，对第一待选小区的频率优先级降低预设级别等级。具体的，所述在同一频率上的多个小区连续发生所述LBT连续失败次数超出预设次数阈值是指在同一频率上的多个小区连续发生M次所述LBT连续失败次数超出预设次数阈值，其中M由网络侧配置。
参照图4，图4是本发明实施例中一种小区重选的装置的结构示意图。所述小区重选的装置可以包括：
切换模块41，适于在前一小区如果LBT连续失败次数超出预设次数阈值后，则驻留在当前服务小区；
确定模块42，适于在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；
排序模块43，适于对所述集合内的目标小区进行排序；
重选模块44，适于依次选择排序在前的目标小区，进行小区重选；其中，所述目标小区的重选参数值越低，被选中的几率越低。
在本发明实施例中，通过设置降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合，然后进行小区重选，相比于现有技术中，UE采用相同条件对所有的小区进行重选，导致容易重选回前一小区，采用本发明实施例的方案，可以降低重选回前一小区的可能性。
本发明实施例还提供了一种存储介质，其上存储有计算机指令，所述计算机指令运行时执行上述小区重选的方法的步骤。所述存储介质可以是计算机可读存储介质，例如可以包括非挥发性存储器(non-volatile)或者非瞬态(non-transitory)存储器，还可以包括光 盘、机械硬盘、固态硬盘等。
本发明实施例还提供了一种用户终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机指令，所述处理器运行所述计算机指令时执行上述小区重选的方法的步骤。所述用户终端包括但不限于手机、计算机、平板电脑等终端设备。
可以理解的是，本方明实施例可适用于5G NR通信系统，还可适用于4G、3G通信系统，还可适用于未来新的各种通信系统，例如6G、7G等。本方明实施例也适用于不同的网络架构，包括但不限于中继网络架构、双链接架构、车联网(Vehicle-to-Everything)、V2X等通信架构。
本发明实施例中所述的网络侧可以包括核心网的设备，其中核心网可以是演进型分组核心网(evolved packet core，简称EPC)、5G Core Network(5G核心网)，还可以是未来通信系统中的新型核心网。5G Core Network由一组设备组成，并实现移动性管理等功能的接入和移动性管理功能(Access and Mobility Management Function，AMF)、提供数据包路由转发和QoS(Quality of Service)管理等功能的用户面功能(User Plane Function,UPF)、提供会话管理、IP地址分配和管理等功能的会话管理功能(Session Management Function，SMF)等。EPC可由提供移动性管理、网关选择等功能的MME、提供数据包转发等功能的Serving Gateway(S-GW)、提供终端地址分配、速率控制等功能的PDN Gateway(P-GW)组成。
本发明实施例中的网络侧可以指无线接入网的基站(Base Station，简称BS)，所述基站也可称为基站设备，是一种部署在无线接入网(RAN)用以提供无线通信功能的装置。例如在2G网络中提供基站功能的设备包括基地无线收发站(英文：base transceiver station,简称BTS)，3G网络中提供基站功能的设备包括节点B(NodeB)，在4G网络中提供基站功能的设备包括演进的节点B(evolved NodeB，eNB)，在无线局域网络(wireless local area networks，简称WLAN) 中，提供基站功能的设备为接入点(access point，简称AP)，5G新无线(New Radio，简称NR)中的提供基站功能的设备gNB,以及继续演进的节点B(ng-eNB),其中gNB和终端之间采用NR技术进行通信，ng-eNB和终端之间采用E-UTRA(Evolved Universal Terrestrial Radio Access)技术进行通信，gNB和ng-eNB均可连接到5G核心网。本申请实施例中的基站还包含在未来新的通信系统中提供基站功能的设备等。
本发明实施例中的网络侧还可以包含无线接入网的基站控制器，是一种管理基站的装置，例如2G网络中的基站控制器(base station controller，简称BSC)、3G网络中的无线网络控制器(radio network controller，简称RNC)，未来新的通信系统中控制管理基站的装置。
本发明实施例中的用户终端可以指各种形式的UE、接入终端、用户单元、用户站、移动站、移动台(Mobile Station，简称MS)、远方站、远程终端、移动设备、用户终端、终端设备(terminal equipment)、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，简称SIP)电话、无线本地环路(Wireless Local Loop，简称WLL)站、个人数字处理(Personal Digital Assistant，简称PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，简称PLMN)中的终端设备等，本发明实施例对此并不限定。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，表示前后关联对象是一种“或”的关系。
本发明实施例中出现的“多个”是指两个或两个以上。
本发明实施例中出现的第一、第二等描述，仅作示意与区分描述 对象之用，没有次序之分，也不表示本发明实施例中对设备个数的特别限定，不能构成对本发明实施例的任何限制。
本发明实施例中出现的“连接”是指直接连接或者间接连接等各种连接方式，以实现设备间的通信，本发明实施例对此不做任何限定。
本发明实施例中，所述处理器可以为中央处理单元(Central Processing Unit，简称CPU)，该处理器还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，简称DSP)、专用集成电路(Application Specific Integrated Circuit，简称ASIC)、现成可编程门阵列(Field Programmable Gate Array，简称FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本发明实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，简称ROM)、可编程只读存储器(Programmable ROM，简称PROM)、可擦除可编程只读存储器(Erasable PROM，简称EPROM)、电可擦除可编程只读存储器(Electrically EPROM，简称EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，简称RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(Random Access Memory，简称RAM)可用，例如静态随机存取存储器(Static RAM，简称SRAM)、动态随机存取存储器(Dynamic Random Access Memory，简称DRAM)、同步动态随机存取存储器(Synchronous DRAM，简称SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，简称DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，简称ESDRAM)、同步连接动态随机存取存储器(Synchronous connection to DRAM，简称SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，简称DR-RAM)。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
在本申请所提供的几个实施例中，应该理解到，所揭露的方法、装置和系统，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以 位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理包括，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元，可以存储在一个计算机可读取存储介质中。上述软件功能单元存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，简称ROM)、随机存取存储器(Random Access Memory，简称RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
虽然本发明披露如上，但本发明并非限定于此。任何本领域技术人员，在不脱离本发明的精神和范围内，均可作各种更动与修改，因此本发明的保护范围应当以权利要求所限定的范围为准。

Claims (15)

  1. 一种小区重选的方法，其特征在于，包括以下步骤：
    在前一小区如果LBT连续失败次数超出预设次数阈值后，则驻留在当前服务小区；
    在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；
    对所述集合内的目标小区进行排序；
    依次选择排序在前的目标小区，进行小区重选；
    其中，所述目标小区的重选参数值越低，被选中的几率越低。
  2. 根据权利要求1所述的小区重选的方法，其特征在于，所述重选参数值包括小区选择接收水平值以及小区选择质量值，所述根据各个小区的重选参数值确定目标小区的集合包括：
    确定小区选择接收水平值以及小区选择质量值均大于零的小区，以作为所述目标小区的集合。
  3. 根据权利要求2所述的小区重选的方法，其特征在于，当所述小区为所述前一小区时，确定所述前一小区的小区选择接收水平值为初始小区选择接收水平值减去第一临时偏移量之后得到的值；
    和/或，
    当所述小区为所述前一小区时，确定所述前一小区的小区选择质量值为初始小区选择质量值减去第二临时偏移量之后得到的值。
  4. 根据权利要求1或2所述的小区重选的方法，其特征在于，所述重选参数值还包括R值，对所述集合内的目标小区进行排序包括：
    确定所述集合内各个目标小区的R值，其中，当所述集合内的目标小区包含有所述前一小区时，确定所述前一小区的R值为初始 R值减去第三临时偏移量之后得到的值；
    根据所述R值，对各个目标小区进行排序；
    其中，所述R值越高，排序越前。
  5. 根据权利要求4所述的小区重选的方法，其特征在于，采用下述公式，确定所述前一小区的R值：
    R n＝Q meas,n-Q offset-Q offsettemp3；
    其中，R n表示所述前一小区的R值，Q meas,n表示所述前一小区的RSRP测量值，Q offset表示偏置值，Q offsettemp3表示第三临时偏移量。
  6. 根据权利要求3所述的小区重选的方法，其特征在于，采用下述公式，确定所述前一小区的小区选择接收水平值以及小区选择质量值：
    S rxlev＝P-X-Q offsettemp1；
    S qual＝Q-Y-Q offsettemp2；
    其中，S rxlev表示所述前一小区选择接收水平值，P表示测量到的所述前一小区选择接收水平值，X表示所述前一小区选择接收水平值门限，Q offsettemp1表示第一临时偏移量，S qual表示所述前一小区选择质量值，Q表示测量到的所述前一小区选择质量值，Y表示所述前一小区选择质量值门限，Q offsettemp2表示第二临时偏移量。
  7. 根据权利要求1所述的小区重选的方法，其特征在于，所述重选参数值包括频率优先级，根据各个小区的重选参数值确定目标小区的集合包括：
    确定每个待选小区的频率优先级；
    根据所述待选小区的频率优先级，确定所述目标小区的集合。
  8. 根据权利要求7所述的小区重选的方法，其特征在于，在确定每个待选小区的频率优先级之前，还包括：
    在所有待选小区中，根据前一小区所在的频率确定位于所述频率上的待选小区，以作为第一待选小区；
    对位于所述频率上的第一待选小区的频率优先级降低预设级别等级。
  9. 根据权利要求7所述的小区重选的方法，其特征在于，根据所述待选小区的频率优先级，确定所述目标小区的集合包括：
    依照所述频率优先级自高至低的顺序，逐级确定是否存在待选小区的信号质量在预设时长内超出预设质量阈值，直至确定一个频率优先级具有一个或多个信号质量在预设时长内超出预设质量阈值的第二待选小区；
    将所述第二待选小区作为所述目标小区的集合；
    其中，当所述待选小区中包含有所述前一小区时，确定所述前一小区的预设时长大于所述待选小区中其他小区的预设时长，和/或，确定所述前一小区的预设质量阈值大于所述待选小区中其他小区的预设质量阈值。
  10. 根据权利要求9所述的小区重选的方法，其特征在于，所述重选参数值还包括R值，对所述集合内的目标小区进行排序包括：
    确定所述集合内各个目标小区的R值；
    根据所述R值，对各个目标小区进行排序；
    其中，所述R值越高，排序越前。
  11. 根据权利要求9所述的小区重选的方法，其特征在于，
    当所述第二待选小区的频率优先级高于所述当前服务小区的频率优先级时，采用下述公式，确定所述前一小区的预设质量阈值：
    Thresh＝Thresh x+Q offsettemp4；
    或者，
    当所述第二待选小区的频率优先级低于所述当前服务小区的频率优先级时，采用下述公式，确定所述前一小区的预设质量阈值：
    Thresh＝Thresh x+Q offsettemp5；
    其中，Thresh表示所述前一小区的预设质量阈值，Thresh x表示所述前一小区的初始预设质量阈值，Q offsettemp4表示第四临时偏移量，Q offsettemp5表示第五临时偏移量。
  12. 根据权利要求1所述的小区重选的方法，其特征在于，所述前一小区为预设时长内驻留过的服务小区。
  13. 一种小区重选的装置，其特征在于，包括以下步骤：
    切换模块，适于在前一小区如果LBT连续失败次数超出预设次数阈值后，驻留到当前服务小区；
    确定模块，适于在当前服务小区需要进行小区重选时，降低所述前一小区的至少一个重选参数值，并根据各个小区的重选参数值确定目标小区的集合；
    排序模块，适于对所述集合内的目标小区进行排序；
    重选模块，适于依次选择排序在前的目标小区，进行小区重选；
    其中，所述目标小区的重选参数值越低，被选中的几率越低。
  14. 一种存储介质，其上存储有计算机指令，其特征在于，所述计算机指令运行时执行权利要求1至12任一项所述小区重选的方法的步骤。
  15. 一种用户终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机指令，其特征在于，所述处理器运行所述计算机指令时执行权利要求1至12任一项所述小区重选的方法的步骤。
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