WO2016061734A1 - 一种目标小区选择方法和终端 - Google Patents

一种目标小区选择方法和终端 Download PDF

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Publication number
WO2016061734A1
WO2016061734A1 PCT/CN2014/088948 CN2014088948W WO2016061734A1 WO 2016061734 A1 WO2016061734 A1 WO 2016061734A1 CN 2014088948 W CN2014088948 W CN 2014088948W WO 2016061734 A1 WO2016061734 A1 WO 2016061734A1
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WO
WIPO (PCT)
Prior art keywords
cell
terminal
neighboring
neighboring cell
state
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PCT/CN2014/088948
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English (en)
French (fr)
Inventor
党淑君
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480002403.8A priority Critical patent/CN105830498B/zh
Priority to PCT/CN2014/088948 priority patent/WO2016061734A1/zh
Priority to EP14894815.1A priority patent/EP3038409B1/en
Priority to US14/901,800 priority patent/US9807666B2/en
Priority to JP2016554777A priority patent/JP6249257B2/ja
Publication of WO2016061734A1 publication Critical patent/WO2016061734A1/zh

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    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H04W36/008375—Determination of triggering parameters for hand-off based on historical data

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a cell reselection target cell selection method and terminal.
  • Cell reselection is one of the most basic processes of cellular mobile communication systems. Cell phone relocation is required to continuously perform cell reselection to ensure service quality. In the process of cell reselection, timely selection of a suitable target cell directly determines the network performance of the mobile phone.
  • a typical cell reselection procedure is as follows: To avoid frequent ping-pong reselection, the cell reselection criteria are through hysteresis signal strength (usually 3 dB millivolts dBm) and hysteresis time (usually Set to 5s) two parameters to control the cell reselection behavior of the terminal: when the received signal strength of the target cell (eg -72dBm) is greater than the signal strength of the serving cell (-80dBm) plus the hysteresis signal strength (3dBm), and the duration After the lag time (for example, 5 s), the cell reselection is initiated, otherwise it continues to camp on the current serving cell.
  • hysteresis signal strength usually 3 dB millivolts dBm
  • hysteresis time usually Set to 5s
  • the cell signal may change rapidly, usually the signal of the serving cell is rapidly reduced.
  • the signal of the target cell increases rapidly, and the situation occurs frequently: in the process of determining the reselected cell, the duration has not reached the lag time, the terminal has left the coverage of the current serving cell, and the cell is reselected. The decision has not been completed yet.
  • the terminal does not have a target cell with a good access signal, and accesses the target cell after a short network drop.
  • the short drop of the network makes the user unable to enjoy the communication service, or is The interruption of the communication service is directly caused to reduce the user experience.
  • the embodiment of the present invention provides a target cell selection method and a terminal, which are used to solve the problem of short-term dropped network frequently occurring in a high-speed moving scenario.
  • a first aspect of the embodiments of the present invention provides a target cell selection method, including:
  • the terminal acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, where the serving cell is the cell currently camped by the terminal, and the neighboring cell is the cell that the terminal can receive the signal;
  • a set of target cells to be selected includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific moment, where the specific moment is a signal strength and neighbor of the recently acquired serving cell.
  • the moment of the signal strength of the cell, the first intensity parameter is a signal strength, or an intensity parameter obtained by an operation of the signal strength;
  • the terminal detects a signal change trend of a neighboring cell in the set of target cells to be selected within the preset duration before the specific moment;
  • a neighboring cell in a set of neighboring cells whose signal change trend satisfies the first state is a target cell, where the first state is a steady trend and/or an upward trend;
  • the terminal reselects the serving cell to the target cell.
  • the terminal determines, in the set of neighboring cells, that the signal change trend in the set of candidate target cells meets the first state.
  • the method further includes:
  • the terminal detects a signal change trend of the serving cell in the preset duration
  • Determining, by the terminal, that the neighboring cell in the set of neighboring cells in which the signal change trend satisfies the first state in the set of target cells to be selected is the target cell includes:
  • the terminal Determining, by the terminal, that a signal change trend of the serving cell in the preset target cell length meets a second state, the terminal determining, in the candidate target cell set, a neighboring cell in a set of neighboring cells that meets a first state For the target cell, the second state is a steady trend and/or a downward trend.
  • a signal change trend of the serving cell in the preset duration after the step of detecting, by the terminal, a signal change trend of the serving cell in the preset duration, include:
  • the terminal waits for the next preset time period, and triggers the step of the terminal determining the target cell set to be selected.
  • the step that the terminal selects the first strength parameter at the specific time is greater than the neighboring cell of the serving cell, and the step of forming the target cell set to be selected further includes:
  • the terminal When it is determined that the to-be-selected target cell set is not an empty set, triggering, by the terminal, a signal change trend of a neighboring cell in the to-be-selected target cell set in the preset duration before the specific time;
  • the terminal waits for the next preset time period, and triggers the step of the terminal determining the target cell set to be selected.
  • the terminal determines the candidate to be selected.
  • a neighboring cell in the set of neighboring cells in which the signal change trend in the target cell set meets the first state is the target cell, and specifically includes:
  • the target cell Determining, by the terminal, that the neighboring cell with the second highest strength parameter in the set of neighboring cells in the set of target cells in which the signal change trend meets the first state is the target cell, where the second strength parameter is a signal strength, or is a signal
  • the intensity parameter obtained by the calculation of the intensity.
  • the terminal determines that a signal change trend in the set of candidate target cells meets the first state.
  • the neighboring cell with the largest second strength parameter in the neighboring cell set is the target cell, including:
  • the terminal selects, as the first neighboring cell, a neighboring cell with the highest signal strength from the set of target cells to be selected;
  • the first neighboring cell When it is determined that the signal change trend of the first neighboring cell does not satisfy the first state, the first neighboring cell is removed from the to-be-selected target cell set, and the candidate target cell set is updated, and the device is re-triggered. And the step of the terminal selecting, as the first neighboring cell, the neighboring cell with the strongest signal strength from the set of target cells to be selected;
  • the terminal is configured according to the preset
  • the steps of obtaining the signal strength of the serving cell and the signal strength of the neighboring cell before the interval period include:
  • the step of triggering, by the terminal, the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period is triggered.
  • the determining, by the terminal, whether the terminal is in a high-speed motion state includes:
  • the terminal detects a speed value of the terminal by using a sensor
  • the determining, by the terminal, whether the device is in the high-speed motion state includes:
  • the terminal detects whether the offset value of the automatic frequency control of the terminal in the preset duration is greater than a preset offset value
  • a second aspect of the embodiments of the present invention provides a terminal, including:
  • An acquiring module configured to acquire a signal strength of a serving cell and a signal strength of a neighboring cell according to a preset time period, where the serving cell is a cell currently camped by the terminal, and the neighboring cell is a terminal that can receive a signal Community
  • a first determining module configured to determine a target cell set to be selected, where the to-be-selected target cell set includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific moment, where the specific time is the most recently acquired serving cell
  • the moment of the signal strength and the signal strength of the neighboring cell, the first strength parameter is a signal strength, or an intensity parameter obtained by an operation of the signal strength
  • a first detecting module configured to detect a signal change trend of a neighboring cell in the to-be-selected target cell set determined by the first determining module in the preset duration before the specific time
  • a second determining module configured to determine, in the to-be-selected target cell set, a neighboring cell in the set of neighboring cells that the first detection module detects that the signal change trend meets the first state is the target cell, where the first The status is a steady trend and / or an upward trend;
  • a reselection module configured to reselect the serving cell to the target cell determined by the second determining module.
  • the terminal further includes:
  • a second detecting module configured to detect a signal change trend of the serving cell in the preset duration
  • a first triggering module configured to trigger the second determining module when determining that a signal change trend of the serving cell meets a second state in the preset duration, where the second state is a stable trend and/or a falling trend .
  • the terminal further includes:
  • the second triggering module is configured to: when it is determined that the signal change trend of the serving cell does not satisfy the second state in the preset duration, wait for the next preset time period, and trigger the first determining module.
  • the terminal further includes:
  • a first determining module configured to determine whether the to-be-selected target cell set is an empty set
  • a third triggering module configured to trigger the first detecting module when determining that the to-be-selected target cell set is not an empty set
  • the fourth triggering module is configured to: when determining that the to-be-selected target cell set is an empty set, wait for a next preset time period, and trigger the first determining module.
  • the second determining module is specifically used Determining, in the set of candidate target cells, the neighboring cell with the second highest strength parameter in the set of neighboring cells that meet the first state is the target cell, and the second strength parameter is the signal strength, or is the signal strength.
  • the intensity parameter obtained through the operation.
  • the second determining module specifically includes:
  • a selecting unit configured to select, as the first neighboring cell, a neighboring cell with the highest signal strength from the set of target cells to be selected
  • a determining unit configured to determine whether a signal change trend of the first neighboring cell meets the first state
  • a triggering unit configured to: when determining that a signal change trend of the first neighboring cell does not satisfy the first state And removing the first neighboring cell from the to-be-selected target cell set, updating the to-be-selected target cell set, and re-trigating the selecting unit;
  • a determining unit configured to determine, when the first neighboring cell meets the first state, that the first neighboring cell is the target cell.
  • the terminal further includes:
  • a second determining module configured to determine whether the terminal is in a high-speed motion state
  • the fifth triggering module is configured to trigger the acquiring module when determining that the terminal is in a high-speed motion state.
  • the second determining module is specifically configured to detect, by using a sensor, a speed value of the terminal, When the speed value of the terminal is greater than a preset speed threshold, it is determined that the terminal is in the high speed motion state.
  • the second determining module is specifically configured to detect that the automatic frequency control of the terminal is in advance Determining whether the offset value in the duration is greater than the preset offset value, and determining that the terminal is in the high speed when the automatic frequency control of the terminal is greater than the preset offset value in the preset duration Movement state.
  • a third aspect of the embodiments of the present invention provides a terminal, including:
  • Input device output device, processor and memory
  • the processor is configured to perform the following steps by invoking an operation instruction stored by the memory:
  • the signal strength of the serving cell and the signal strength of the neighboring cell are obtained according to a preset time period, where the serving cell is a cell currently camped by the terminal, and the neighboring cell is a cell that the terminal can receive a signal;
  • the to-be-selected target cell set includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific moment, where the specific time is a signal strength of the recently acquired serving cell and a signal of the neighboring cell At the moment of intensity, the first intensity parameter is a signal strength, or an intensity parameter obtained by an operation of the signal strength;
  • a neighboring cell in the set of neighboring cells whose signal change trend satisfies the first state is a target cell, where the first state is a steady trend and/or an upward trend;
  • the serving cell is reselected to the target cell.
  • the processor further performs the following steps:
  • the processor specifically performs the following steps:
  • the terminal Determining, by the terminal, that a signal change trend of the serving cell in the preset target cell length meets a second state, the terminal determining, in the candidate target cell set, a neighboring cell in a set of neighboring cells that meets a first state For the target cell, the second state is a steady trend and/or a downward trend.
  • the processor further performs the following steps:
  • the processor further performs the following steps. :
  • the processor specifically performs the following steps. :
  • the neighboring cell having the second highest strength parameter is the target cell, and the second strength parameter is the signal strength, or is calculated by the signal strength.
  • the strength parameter obtained.
  • the processor specifically performs the following steps:
  • the first neighboring cell When it is determined that the signal change trend of the first neighboring cell does not satisfy the first state, the first neighboring cell is removed from the to-be-selected target cell set, and the candidate target cell set is updated, and the device is re-triggered. And the step of selecting, as the first neighboring cell, the neighboring cell with the strongest signal strength from the set of target cells to be selected;
  • the processor further performs the following steps. :
  • the step of acquiring the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period is triggered.
  • the processor specifically performs the following steps:
  • the processor specifically performs the following steps:
  • the terminal determines the reselection of the serving cell by determining the signal change trend of the neighboring cell. Specifically, the terminal presses Obtaining a signal strength of the serving cell and a signal strength of the neighboring cell according to a preset time period, and selecting a first strength parameter at a specific moment is greater than a neighboring cell of the serving cell to form a set of the target cell to be selected, where the first strength parameter is a signal strength, or
  • the specific time is the time when the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired, and the signal strength of the neighboring cell in the target cell set to be selected is the signal strength at the specific time.
  • the terminal detects a signal change trend of the neighboring cell in the target cell set to be selected within the preset time period before the specific time, and determines one of the neighbor cell sets in which the signal change trend in the candidate target cell set satisfies the first state.
  • the neighboring cell is the target cell
  • the first state is a stable trend and/or an upward trend, that is, the signal strength of the target cell is good, and the signal strength may be continuously enhanced, and the terminal directly reselects the serving cell to the target cell, It is necessary to determine the hysteresis time so that the terminal can change rapidly in the case of the signal.
  • the signal quality of the network resident is improved, the number of short-term dropped calls is reduced, and the call rate of the terminal is improved.
  • FIG. 1 is a schematic flowchart of a method for selecting a target cell according to an embodiment of the present invention
  • FIG. 2 is another schematic flowchart of a target cell selection method according to an embodiment of the present invention.
  • FIG. 3 is another schematic flowchart of a target cell selection method according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a terminal in an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another terminal in an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another terminal in an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of another terminal in an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of another terminal in an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another terminal in an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another terminal in an embodiment of the present invention.
  • the term "specific moment" is the time at which the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired.
  • the terminal acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, and assumes that the preset time period is 1 second, and the signal strength of the serving cell and the neighboring cell is obtained from 0 seconds, and then the time is The signal strength of the serving cell and the neighboring cell is obtained every 1 second (for example, in the 1st second, the 2nd second, the 3rd second, etc.), and it is assumed that the terminal is the 8th second, the terminal acquires the serving cell and the neighboring cell once.
  • the signal strength, then the 8th second is a specific time, assuming that this is the 8.3th second (any time between the 8th and 9th seconds), then the specific time is still the 8th second, assuming The lapse of time reaches the ninth second, and the signal strength of the serving cell and the signal strength of the neighboring cell are obtained, and the specific time is the ninth second.
  • the term "stability trend" means that the signal strength is stable, that is, the signal intensity varies within a preset intensity threshold, for example, the signal intensity varies within 2 decibels (decibel-mV, dBm), and the current preset intensity threshold is still Other values can be taken, which can be set according to the actual application, and are not limited herein.
  • upward trend means that the signal strength is continuously increased, and the amplitude of the rise in a certain period of time exceeds the first preset signal strength.
  • the first preset signal strength can be set according to the actual application, which is not limited herein.
  • the term "downward trend" means that the signal strength is continuously decreased, and the amplitude of the drop in a certain time exceeds the second preset signal strength.
  • the second preset signal strength can be set according to the actual application, which is not limited herein.
  • an embodiment of a method for selecting a target cell in an embodiment of the present invention includes:
  • the terminal acquires a signal strength of the serving cell and a signal strength of the neighboring cell according to the preset time period.
  • the terminal acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, where the serving cell is the cell currently camped by the terminal, and the neighboring cell is the terminal that can receive the signal. Community.
  • the terminal can obtain the time from the beginning to the current time, this time period.
  • the signal strength of the serving cell and the neighboring cell with the preset time period as the interval is obtained from the 0th second, the current time is 6.3 seconds, and the preset time period is 2 seconds, the terminal acquires the 0th second, the first Signal strength of the serving cell and the neighboring cell of 2 seconds, 4th and 6th seconds.
  • the preset time period may be set according to actual conditions, for example, may be set to 1 second, may be set to 0.5 second, or the like, and may be set to other values, which is not limited herein.
  • the terminal determines a set of target cells to be selected, where the set of target cells to be selected includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific moment;
  • the terminal may compare the first strength parameter of the serving cell at the specific time with the first strength parameter of each neighboring cell at the specific time, and The specific time parameter is greater than the neighboring cell of the serving cell, and the set of the target cell to be selected is the time when the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired, and the first strength parameter is the signal strength. Or the intensity parameter obtained by the calculation of the signal strength.
  • the specific time is different from the execution time of the step 102.
  • the execution time of the step 102 may be at the specific time or may not be at the specific time, which is not limited herein. For example, if the time is 0 seconds, the signal strength of the serving cell and the signal strength of the neighboring cell are obtained according to the preset time period of 1 second. If the execution time of step 102 is 6.4 seconds, the terminal obtains the signal strength and neighbor of the serving cell last time.
  • the time of the signal strength of the cell is 6th second, in this case, the execution time of step 102 is 6.4 seconds, and the specific time is 6th second; if the execution time of step 102 is 8th second, the terminal is last time The time at which the signal strength of the serving cell and the signal strength of the neighboring cell are obtained is 8 seconds. In this case, the execution time of step 102 is the same as the specific time, which is the 8th second.
  • the terminal detects a signal change trend of a neighboring cell in a set of target cells to be selected within a preset duration before the specific moment.
  • the terminal After obtaining the target cell set to be selected, the terminal detects a signal change trend of the neighboring cell in the target cell set to be selected within the preset time period before the specific time, and the signal change trend includes a steady trend, an upward trend or a downward trend.
  • the preset duration of the detected duration is greater than the preset time period and the signal change trend can be detected, that is, the preset duration should be At least the signal strength of the serving cell and the signal strength of the neighboring cell
  • the end point of the preset duration may be a certain time before the specific time, and only the signal change trend within the preset duration can reflect the signal change trend at the specific moment to a certain extent, of course, The closer the end point of the preset time length is to the specific time, the more the signal change trend at the specific time can be reflected, and the preset time length and the end point of the preset time length can be set according to the actual application situation.
  • the end point of the preset duration is the specific moment.
  • the preset time period is 1 second, and the preset time length can be 5 seconds.
  • the terminal detects that the first time to the 6th second is selected within 5 seconds.
  • the signal change trend of the neighboring cell in the target cell set if the current time is the 8th second, the terminal detects a signal change trend of the neighboring cell in the target cell set to be selected within 5 seconds from the 3rd to the 8th second, the pre- The settling time can also be set according to the actual application situation, as long as the signal change trend of the neighboring cell within the preset time period can be determined.
  • the terminal determines, in the set of target cells to be selected, a neighboring cell in the set of neighboring cells whose signal change trend satisfies the first state is the target cell, where the first state is a stable trend and/or an upward trend;
  • the terminal After detecting, by the terminal, a signal change trend of the neighboring cell in the target cell set to be selected in the preset time period, determining, by the terminal, a neighboring cell in the set of neighboring cells in the target cell set that meets the first state is the target cell,
  • the first state is a steady trend and/or an upward trend;
  • the first type is that the terminal determines, in the set of target cells to be selected, a neighboring cell in the set of neighboring cells whose signal change trend satisfies a stable trend as the target cell;
  • the second method is that the terminal determines that one neighboring cell in the set of neighboring cells in which the signal change trend in the set of target cells to be selected meets the rising trend is the target cell;
  • the third type is that the terminal determines that the neighboring cell in the set of candidate target cells that meets the stable trend and the neighboring cell in the set of neighboring cells that satisfy the rising trend is the target cell.
  • a suitable method can be selected therefrom, which is not limited herein.
  • the terminal reselects a serving cell to the target cell.
  • the terminal After determining the target cell, the terminal reselects the serving cell to the target cell.
  • the terminal determines the reselection of the serving cell by determining the signal change trend of the neighboring cell, and the basis is that after analyzing the signal strength of the cell captured on the high-speed railway, the typical camping time of the single cell is 20s; The signal of the serving cell continues to be poor before the network or reselection occurs. (RSRP/-90dBm) or sudden deterioration; and the signal strength change of the neighboring cell is regular.
  • the terminal acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, and selects the first strength parameter at the specific time is greater than the neighboring cell of the serving cell to form a set of the target cell to be selected, and the first strength parameter is The signal strength, or the strength parameter obtained by calculating the signal strength, the specific time is the time when the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired, and the neighboring cell in the target cell set to be selected is at the specific moment. The signal strength of the neighboring cell in the target cell set to be selected within the preset time period before the specific time is detected, and the neighboring cell in which the signal change trend in the candidate target cell set satisfies the first state is determined.
  • the terminal determines that one neighboring cell in the set of neighboring cells in which the signal change trend in the candidate target cell set meets the first state is the target cell, and the signal change trend of the serving cell may be an upward trend. It may be a stable trend, and may also be a downward trend.
  • the signal change trend of the serving cell, the signal change trend of the serving cell and the signal change trend of the neighboring cell are used as reference conditions to select the target cell. Referring to FIG. 2, another embodiment of the target cell selection method in the embodiment of the present invention is shown. include:
  • the terminal acquires a signal strength of the serving cell and a signal strength of the neighboring cell according to the preset time period.
  • the terminal acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, where the serving cell is the cell currently camped by the terminal, and the neighboring cell is the terminal that can receive the signal. Community.
  • the terminal can obtain the signal strength of the serving cell and the neighboring cell with the preset time period as the interval from the initial acquisition to the current time, for example, starting from the 0th second, the current time is the first time. 6.3 seconds, the preset time period is 2 seconds, then the terminal gets the 0th second. Signal strength of the serving cell and the neighboring cell of the 2nd second, 4th and 6th second.
  • the preset time period may be set according to actual conditions, for example, may be set to 1 second, may be set to 0.5 second, or the like, and may be set to other values, which is not limited herein.
  • the terminal determines a to-be-selected target cell set, where the to-be-selected target cell set includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific moment;
  • the terminal may compare the first strength parameter of the serving cell at the specific time with the first strength parameter of each neighboring cell at the specific time, and The specific time parameter is greater than the neighboring cell of the serving cell, and the set of the target cell to be selected is the time when the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired, and the first strength parameter is the signal strength. Or the intensity parameter obtained by the calculation of the signal strength.
  • the specific operation manner may be various.
  • the first strength parameter may be obtained by subtracting the receiving sensitivity RXLEV_ACCESS_MIN of the cell base station from the signal strength Rxlev, or may be The signal strength is obtained by subtracting the product of the receiving sensitivity of the cell site from the set weight (for example, 40%).
  • the signal strength may be calculated by calculating the signal strength and other cell base station parameters. .
  • the execution time of the step 202 may be at the specific time or may not be at the specific time, which is not limited herein. For example, if the time is 0 seconds, the signal strength of the serving cell and the signal strength of the neighboring cell are obtained according to the preset time period of 1 second. If the execution time of step 202 is 6.4 seconds, the terminal obtains the signal strength and neighbor of the serving cell last time. The time of the signal strength of the cell is 6th second, in this case, the execution time of step 202 is 6.4 seconds, and the specific time is 6th; if the execution time of step 202 is 8th, the terminal is last time. The time at which the signal strength of the serving cell and the signal strength of the neighboring cell are obtained is 8 seconds. In this case, the execution time of step 202 is the same as the specific time, which is the 8th second.
  • the terminal determines whether the to-be-selected target cell set is an empty set.
  • the terminal After the terminal obtains the target cell set to be selected, determining whether the target cell set to be selected is an empty set;
  • step 204 is triggered;
  • the terminal waits for the next preset time period, and then triggers the step. 202.
  • step 202 may be triggered not only after waiting for a preset time period, but may wait for a longer time, for example, two or three. The preset time period or more, and then the step 202 is triggered, which can be set according to actual needs, and is not limited herein.
  • the terminal detects a signal change trend of a neighboring cell in the to-be-selected target cell set in the preset duration before the specific time.
  • the terminal After the terminal obtains the target cell set to be selected, and determines that the target cell set to be selected is not an empty set, detecting a signal change trend of the neighboring cell in the target cell set to be selected within a preset time period before the specific time, the signal change trend is a signal.
  • the trend of intensity change, the trend of the signal includes a steady trend, an upward trend or a downward trend.
  • the preset duration of the detected duration is greater than the preset time period and the signal change trend can be detected, that is, the preset duration should be At least the signal strength of the serving cell and the signal strength of the neighboring cell can be detected three times.
  • the end point of the preset duration may be a certain time before the specific time, and only the signal change trend within the preset duration can be To some extent, the signal change trend at the specific moment is reflected.
  • the closer the end of the preset duration is to the specific moment the more the signal trend of the specific moment can be reflected, and the preset duration can be determined according to the actual application.
  • the end point of the preset duration is the specific moment. For example, if the acquisition is started from the 0th second, the current time is the 6th second, the preset time period is 1 second, and the preset time length can be 5 seconds. The terminal detects that the first time to the 6th second is selected within 5 seconds.
  • the signal change trend of the neighboring cell in the target cell set if the current time is the 8th second, the terminal detects a signal change trend of the neighboring cell in the target cell set to be selected within 5 seconds from the 3rd to the 8th second, the pre- The settling time can also be set according to the actual application situation, as long as the signal change trend of the neighboring cell within the preset time period can be determined.
  • the terminal detects a signal change trend of the serving cell in the preset duration.
  • the terminal may detect a signal change trend of the serving cell in the preset duration.
  • step 205 may be performed before step 204, may be performed after step 204, and may also be performed simultaneously with step 204. Execution, not limited here.
  • the terminal determines whether a signal change trend of the serving cell in the preset duration satisfies a second state, where the second state is a stable and/or a decreasing trend;
  • the terminal After detecting the signal change trend of the serving cell in the preset duration, the terminal determines whether the signal change trend of the serving cell in the preset duration satisfies the second state.
  • the second state is a stable and/or descending trend, so there are three ways to determine that the signal change trend of the serving cell meets the second state:
  • the first type when it is determined that the signal change trend of the serving cell in the preset time period satisfies a stable trend, determining that the signal change trend of the serving cell in the preset time period satisfies the second state;
  • the second type when it is determined that the signal change trend of the serving cell meets the downward trend in the preset duration, determining that the signal change trend of the serving cell in the preset duration meets the second state;
  • the third type when it is determined that the signal change trend of the serving cell meets the falling trend and satisfies the stable trend in the preset time period, it is determined that the signal change trend of the serving cell in the preset time period satisfies the second state;
  • a suitable method can be selected therefrom, which is not limited herein.
  • the second mode is preferred; if it is necessary to ensure that the terminal is continuously networked, the third mode is preferred.
  • step 207 is triggered;
  • the terminal can wait for the next cycle and trigger step 202.
  • the terminal determines, as the target cell, a neighboring cell in the set of neighboring cells in which the signal change trend of the candidate target cell set meets the first state, where the first state is a stable trend and/or an upward trend.
  • the terminal After detecting the signal change trend of the neighboring cell in the target cell to be selected within the preset time period, when determining that the signal change trend of the serving cell in the preset time period satisfies the second state, the terminal determines the signal in the target cell set to be selected.
  • a neighboring cell in the set of neighboring cells that meets the first state is a target cell, and the first state is a steady trend and/or an upward trend;
  • the first type is that the terminal determines, in the set of target cells to be selected, a neighboring cell in the set of neighboring cells whose signal change trend satisfies a stable trend as the target cell;
  • the second method is that the terminal determines that one neighboring cell in the set of neighboring cells in which the signal change trend in the set of target cells to be selected meets the rising trend is the target cell;
  • the third type is that the terminal determines that the neighboring cell in the set of candidate target cells that meets the stable trend and the neighboring cell in the set of neighboring cells that satisfy the rising trend is the target cell.
  • a suitable method can be selected therefrom, which is not limited herein.
  • the second mode is preferred; if the terminal is continuously networked for the greatest possible guarantee, the third mode is preferred.
  • the signal change trend of the serving cell there are three ways for the signal change trend of the serving cell to satisfy the second state, and there are three ways for the signal change trend of the neighboring cell to satisfy the first state, and any combination between them can be achieved according to actual needs to achieve different effects. For example, if the signal of the target cell is optimized and the frequency of cell reselection is reduced, the signal change trend of the serving cell may be satisfied that the second mode in the second state and the signal change trend of the neighboring cell satisfy the second state in the first state.
  • the various modes are combined, and other combinations of various modes may be performed in order to achieve other effects, which are not limited herein.
  • the terminal reselects a serving cell to the target cell.
  • the terminal After determining the target cell, the terminal reselects the serving cell to the target cell.
  • the terminal can wait for the next preset time period, trigger step 202, start a new round of reselection judgment, or wait for a longer time before starting a new one.
  • the re-election judgment of the round, the specific waiting time can be determined according to the actual needs, and is not limited herein.
  • the terminal changes the signal change trend of the serving cell and the signal change trend of the neighboring cell as the reference condition for selecting the target cell, and only when determining that the signal change trend of the serving cell in the preset time period satisfies the second state, The terminal determines that one of the neighboring cell sets in the set of target cells in which the signal change trend satisfies the first state is the target cell, so that the signal strength of the serving cell does not perform reselection of the serving cell when the signal strength of the serving cell increases, so that the terminal does not perform the reselection of the serving cell. While ensuring the signal strength of the target cell, the frequency of reselection of the serving cell is reduced, and system resources are saved.
  • the determination of the subsequent target cell selection is performed, which is not limited herein.
  • the terminal uses the signal change trend of the neighboring cell to perform cell reselection.
  • cell reselection can be used in various scenarios.
  • the terminal can first determine whether it is in a high-speed motion state, and only The high-speed motion state uses the signal change trend to perform cell reselection.
  • determining a neighboring cell in the set of neighboring cells in which the signal change trend in the candidate target cell set meets the first state is the target cell.
  • the second strength parameter of the neighboring cell in the neighboring cell set in which the signal change trend satisfies the first state may be compared, and the second strength parameter in the neighboring cell set in which the signal change trend satisfies the first state is determined to be the largest.
  • the neighboring cell is a target cell. Referring to FIG. 3, another embodiment of the method for selecting a target cell in the embodiment of the present invention includes:
  • the terminal determines whether the terminal is in a high-speed motion state.
  • the terminal determines whether the terminal is in a high-speed motion state
  • step 302 is triggered;
  • Step 310 is triggered when it is determined that it is not in a high speed motion state.
  • the terminal may detect a speed value of the terminal by using a sensor, and when the speed value of the terminal is greater than a preset speed threshold, determine that the terminal is in the high-speed motion state.
  • the terminal may detect whether an offset value of the automatic frequency control of the terminal in the preset duration is greater than a preset offset value; and when the automatic frequency control of the terminal is within an preset duration When the preset offset value is greater than, the terminal is determined to be in the high speed motion state.
  • the terminal acquires a signal strength of the serving cell and a signal strength of the neighboring cell according to the preset time period.
  • the terminal When determining that the terminal is in a high-speed motion state, the terminal acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, where the serving cell is the cell currently camped by the terminal, and the neighboring cell is the terminal capable of receiving the signal. Community.
  • the terminal can obtain the signal strength of the serving cell and the neighboring cell with the preset time period as the interval from the initial acquisition to the current time, for example, starting from the 0th second, the current time is the first time. In 6.3 seconds, the preset time period is 2 seconds, and the terminal acquires the signal strengths of the serving cell and the neighboring cell at 0th, 2nd, 4th, and 6th.
  • the preset time period may be set according to actual conditions, for example, may be set to 1 second, may be set to 0.5 second, or the like, and may be set to other values, which is not limited herein.
  • the preset time period is 0.47 seconds.
  • the terminal determines a target cell set to be selected, where the to-be-selected target cell set includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific moment;
  • the terminal may compare the first strength parameter of the serving cell at the specific time with the first strength parameter of each neighboring cell at the specific time, and The specific time parameter is greater than the neighboring cell of the serving cell, and the set of the target cell to be selected is the time when the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired, and the first strength parameter is the signal strength. Or the intensity parameter obtained by the calculation of the signal strength.
  • the specific operation manner may be various.
  • the first strength parameter may be obtained by subtracting the receiving sensitivity RXLEV_ACCESS_MIN of the cell base station from the signal strength Rxlev, or may be The signal strength is obtained by subtracting the product of the receiving sensitivity of the cell site from the set weight (for example, 40%).
  • the signal strength may be calculated by calculating the signal strength and other cell base station parameters. .
  • the first strength parameter is a signal strength Rxlev minus a receiving sensitivity RXLEV_ACCESS_MIN of the cell base station.
  • the specific time is different from the execution time of the step 303, and the execution time of the step 303 may be at the specific time or may not be the specific time, which is not limited herein.
  • the time is 0 seconds
  • the signal strength of the serving cell and the signal strength of the neighboring cell are obtained according to the preset time period of 1 second.
  • the execution time of step 303 is 6.4 seconds
  • the terminal obtains the signal strength and neighbor of the serving cell last time.
  • the time of the signal strength of the cell is the sixth second.
  • the execution time of step 303 is 6.4 seconds, and the specific time is the 6th second; if the execution time of step 303 is the 8th second, the terminal is the last time.
  • the time at which the signal strength of the serving cell and the signal strength of the neighboring cell are obtained is 8 seconds.
  • the execution time of step 303 is the same as the specific time, and is the 8th second.
  • the terminal determines whether the to-be-selected target cell set is an empty set.
  • the terminal After the terminal obtains the target cell set to be selected, determining whether the target cell set to be selected is an empty set;
  • step 305 is triggered;
  • the terminal waits for the next preset time period, and then triggers step 303.
  • step 303 may be triggered not only after waiting for a preset time period, but may wait for a longer time, for example, two or three. The preset time period or more, and then the step 303 is triggered, which can be set according to actual requirements, and is not limited herein.
  • the terminal detects a signal change trend of a neighboring cell in the to-be-selected target cell set in the preset duration before the specific time.
  • the terminal After the terminal obtains the target cell set to be selected, and determines that the target cell set to be selected is not an empty set, detecting a signal change trend of the neighboring cell in the target cell set to be selected within a preset time period before the specific time, the signal change trend is a signal.
  • the trend of intensity change, the trend of the signal includes a steady trend, an upward trend or a downward trend.
  • the preset duration of the detected duration is greater than the preset time period and the signal change trend can be detected, that is, the preset duration should be At least the signal strength of the serving cell and the signal strength of the neighboring cell can be detected three times.
  • the end point of the preset duration may be a certain time before the specific time, and only the signal change trend within the preset duration can be To some extent, the signal change trend at the specific moment is reflected.
  • the closer the end of the preset duration is to the specific moment the more the signal trend of the specific moment can be reflected, and the preset duration can be determined according to the actual application.
  • the end point of the preset duration is the specific moment. For example, if the acquisition is started from the 0th second, the current time is the 6th second, the preset time period is 1 second, and the preset time length can be 5 seconds. The terminal detects that the first time to the 6th second is selected within 5 seconds.
  • the signal change trend of the neighboring cell in the target cell set if the current time is the 8th second, the terminal detects a signal change trend of the neighboring cell in the target cell set to be selected within 5 seconds from the 3rd to the 8th second, the pre- The duration can also be set according to the actual application, as long as It is possible to determine the signal change trend of the neighboring cell within the preset time period.
  • the preset duration is 5 seconds.
  • the terminal detects a signal change trend of the serving cell in the preset duration.
  • the terminal may detect a signal change trend of the serving cell in the preset duration.
  • step 306 may be performed before step 305, may be performed after step 305, and may be performed simultaneously with step 305, which is not limited herein.
  • the terminal determines whether a signal change trend of the serving cell in the preset duration satisfies a second state, where the second state is a stable and/or a decreasing trend.
  • the terminal After detecting the signal change trend of the serving cell in the preset duration, the terminal determines whether the signal change trend of the serving cell in the preset duration satisfies the second state.
  • the second state is a stable and/or descending trend, so there are three ways to determine that the signal change trend of the serving cell meets the second state:
  • the first type when it is determined that the signal change trend of the serving cell in the preset time period satisfies a stable trend, determining that the signal change trend of the serving cell in the preset time period satisfies the second state;
  • the method further includes: determining, when the signal change trend of the serving cell in the preset duration meets a stable trend and is less than the first signal strength threshold, determining the serving cell in the preset duration The signal change trend satisfies the second state;
  • the second type when it is determined that the signal change trend of the serving cell meets the downward trend in the preset duration, determining that the signal change trend of the serving cell in the preset duration meets the second state;
  • the third type when it is determined that the signal change trend of the serving cell meets the falling trend and satisfies the stable trend in the preset time period, it is determined that the signal change trend of the serving cell in the preset time period satisfies the second state;
  • a suitable method can be selected therefrom, which is not limited herein.
  • the second mode is preferred; if it is necessary to ensure that the terminal is continuously networked, the third mode is preferred.
  • step 308 is triggered;
  • the terminal can wait for the next cycle and trigger step 303.
  • the terminal determines that the neighboring cell with the second highest strength parameter in the set of neighboring cells in the set of target cells in which the signal change trend meets the first state is the target cell, where the first state is a stable trend and/or an upward trend.
  • the terminal After detecting the signal change trend of the neighboring cell in the target cell to be selected within the preset time period, when determining that the signal change trend of the serving cell in the preset time period satisfies the second state, the terminal determines the signal in the target cell set to be selected.
  • the neighboring cell with the largest second strength parameter in the set of neighboring cells that meets the first state is the target cell, and the first state is a stable trend and/or an upward trend;
  • the method further determines that when the signal change trend of the neighboring cell in the target cell set to be determined satisfies a stable trend and is greater than the second signal strength threshold, determining a signal change trend of the neighboring cell Satisfy the first state;
  • the second type when it is determined that the signal change trend of the neighboring cell in the target cell set to be selected meets the rising trend, determining that the signal change trend of the neighboring cell satisfies the first state;
  • a suitable method can be selected therefrom, which is not limited herein.
  • the second mode is preferred; if the terminal is continuously networked for the greatest possible guarantee, the third mode is preferred.
  • the signal change trend of the serving cell there are three ways for the signal change trend of the serving cell to satisfy the second state, and there are three ways for the signal change trend of the neighboring cell to satisfy the first state, and any combination between them can be achieved according to actual needs to achieve different effects. For example, if the signal of the target cell is optimized and the frequency of cell reselection is reduced, the signal change trend of the serving cell may be satisfied that the second mode in the second state and the signal change trend of the neighboring cell satisfy the second state in the first state. Ways to combine, depending on the specific In other cases, in order to achieve other effects, a combination of other various modes may be performed, which is not limited herein.
  • the specific operation manner may be various.
  • the second strength parameter may be obtained by subtracting the receiving sensitivity RXLEV_ACCESS_MIN of the cell base station from the signal strength Rxlev, or may be The signal strength is obtained by subtracting the product of the receiving sensitivity of the cell base station from the set weight (for example, 50%).
  • the signal strength may be calculated by calculating the signal strength and other cell base station parameters. .
  • the second intensity parameter is a signal strength
  • the terminal determines that the neighboring cell with the second highest strength parameter in the set of neighboring cells in the set of target cells in which the signal change trend meets the first state is the target cell, and may be implemented in two phases in the actual application:
  • the first stage the terminal selects, as the first neighboring cell, the neighboring cell with the largest second strength parameter from the set of candidate target cells;
  • the terminal determines whether the signal change trend of the first neighboring cell meets the first state
  • the first neighboring cell When it is determined that the signal change trend of the first neighboring cell does not satisfy the first state, the first neighboring cell is removed from the to-be-selected target cell set, the candidate target cell set is updated, and the The first stage;
  • the candidate target cell becomes an empty set, and the terminal can wait for the next cycle, and then triggers step 303.
  • the neighboring cell in addition to determining, in step 308, that the neighboring cell with the second highest strength parameter among the neighboring cell sets in which the signal change trend in the candidate target cell set meets the first state is the target cell,
  • the neighboring cell may be selected as the target cell from the set of neighboring cells in which the signal change trend satisfies the first state in the target cell set to be selected according to other setting rules. For example, if the cell reselection frequency is shortened and the cell reselection frequency is decreased, it may be determined.
  • the neighboring cell with the smallest second-intensity parameter in the set of neighboring cells in the set of target cells in the selected target cell set is the target cell, and other methods may be selected according to actual requirements, which are not limited herein.
  • the terminal reselects a serving cell to the target cell.
  • the terminal After determining the target cell, the terminal reselects the serving cell to the target cell.
  • the terminal performs cell reselection by using an existing hysteresis determination manner.
  • the terminal When it is determined that the terminal is not in a high-speed motion state, the terminal performs cell reselection by using an existing hysteresis decision.
  • Cell reselection in the manner of existing hysteresis decision includes: controlling the cell reselection behavior of the terminal by two parameters: hysteresis signal strength (usually 3 dBm bm) and hysteresis time (usually set to 5s): when the target cell
  • hysteresis signal strength usually 3 dBm bm
  • hysteresis time usually set to 5s
  • the terminal it is first determined whether the terminal is in a high-speed motion state, and only when the vehicle is in a high-speed motion state, the trend determination mode is used for cell reselection. Otherwise, the existing hysteresis determination mode is used for cell reselection, so that the non-high speed is performed.
  • the frequency of cell reselection is significantly reduced, and in the high-speed motion state, short-time network dropping phenomenon can be avoided, and the applicability of the terminal is enhanced, so that it can be better achieved in various application scenarios. a balance between the communication quality and the system overhead.
  • the terminal determines that the neighboring cell with the second strongest parameter in the set of neighboring cells in the set of target cells in the candidate target cell that meets the first state is the target cell, so that the signal of the target cell It is better to improve the communication quality of the terminal under the condition that the required signal change trend is satisfied.
  • the sensor in the terminal detects that the current speed value of the terminal is 250 KM/h, which is greater than the preset speed threshold of 200 KM/h, and the terminal determines that the current state is in a high motion state;
  • the terminal acquires the signal strength of the serving cell A and the neighboring cell according to the preset time period of 1 second. It is assumed that the time is 0 seconds, and the current time is 8.2 seconds. The terminal has acquired the 0th, 1st, 2nd, 3rd, and 4th. , 5, 6, 7, 8 seconds of signal strength of the serving cell and the neighboring cell;
  • the terminal terminal selects the signal strength of the 8th second (specific time) is greater than the neighboring cells D, E, F and G of the serving cell, and constitutes a set of target cells to be selected, wherein the signal of the serving cell A of the 8th second
  • the signal strength of the neighboring cell D is -63 dBm
  • the signal strength of the neighboring cell E is -50 dBm
  • the signal strength of the neighboring cell F is -62 dBm
  • the signal strength of the neighboring cell G is -62 dBm;
  • the terminal detects a signal change of the serving cell from the 3rd second to the 8th second (with a preset duration of 5 seconds)
  • the trend is: the signal strength of the serving cell A in the 3rd second is -45dBm, the signal strength of the serving cell A in the 4th second is -47dBm, and the signal strength of the serving cell A in the 5th second is -50dBm, the 6th second serving cell A
  • the signal strength is -60dBm
  • the signal strength of the serving cell A is -70dBm in the 7th second
  • the signal strength of the serving cell A in the 8th second is -80dBm
  • the signal change trend of the serving cell from the 3rd to the 8th second is determined to be Downtrend
  • the terminal detects a signal change trend of the neighboring cell in the target cell set to be selected from the 3rd to the 8th, and obtains an upward trend of the neighboring cell D from the 3rd to the 8th, and the neighboring cell E is in an upward trend.
  • the neighboring cell F is in a stable trend, and the neighboring cell G is in a downward trend;
  • the terminal determines the neighbor cell set (the neighboring cell D and the neighboring cell) in which the signal change trend of the candidate target cell set satisfies the rising trend.
  • the neighboring cell with the strongest signal strength is the target cell;
  • the terminal reselects the serving cell to the target cell (neighboring cell D).
  • an embodiment of the terminal in the embodiment of the present invention includes:
  • the obtaining module 401 is configured to obtain, according to a preset time period, a signal strength of the serving cell and a signal strength of the neighboring cell, where the serving cell is a cell currently camped by the terminal, and the neighboring cell is a signal that the terminal can receive Community
  • the first determining module 402 is configured to determine a target cell set to be selected, where the to-be-selected target cell set includes a neighboring cell whose first strength parameter is greater than a serving cell at a specific time, where the specific time is a recently acquired serving cell
  • the signal strength and the moment of the signal strength of the neighboring cell, the first strength parameter being a signal strength, or an intensity parameter obtained by operation of the signal strength;
  • the first detecting module 403 is configured to detect a signal change trend of a neighboring cell in the to-be-selected target cell set determined by the first determining module 402 in the preset duration before the specific time;
  • a second determining module 404 configured to determine, in the to-be-selected target cell set, the first detecting module detects that a neighboring cell in the set of neighboring cells that the signal change trend of the first state meets the first state is the target cell,
  • the first state is a steady trend and/or an upward trend;
  • the reselection module 405 is configured to reselect the serving cell to the target cell determined by the second determining module 404.
  • the terminal implements the serving cell by determining the signal change trend of the neighboring cell. Re-election. Specifically, the acquiring module 401 acquires the signal strength of the serving cell and the signal strength of the neighboring cell according to the preset time period, and the first determining module 402 selects the first strength parameter of the specific time is greater than the neighboring cell of the serving cell, and forms a set of the target cell to be selected.
  • the first strength parameter is a signal strength, or an intensity parameter obtained by calculating a signal strength, where the specific time is the time when the signal strength of the serving cell and the signal strength of the neighboring cell are recently acquired, and the target cell set is selected.
  • the neighboring cell has a better signal strength at the specific time.
  • the first detecting module 403 detects a signal change trend of the neighboring cell in the set of target cells to be selected within the preset time period before the specific time
  • the second determining module 404 determines the A neighboring cell in the set of neighboring cells in which the signal change trend in the candidate target cell set meets the first state is the target cell, and the first state is a stable trend and/or an upward trend, that is, the signal strength of the target cell is better, and the possible The signal strength will continue to increase
  • the reselection module 405 directly reselects the serving cell to the target cell.
  • the terminal can reselect the suitable target cell in time when the signal changes rapidly, improve the signal quality of the network resident, reduce the number of short-time dropped calls, and improve the call of the terminal. Pass rate.
  • the second determining module 404 determines that one neighboring cell in the set of neighboring cells in which the signal change trend in the candidate target cell set meets the first state is the target cell, and the signal change trend of the serving cell may be The upward trend may also be a steady trend, and may also be a downward trend. In practical applications, the second determining module 404 determines one neighboring cell in the set of neighboring cells in which the signal change trend in the set of target cells to be selected satisfies the first state. Before the target cell, the terminal may also first determine the signal change trend of the serving cell, and select the signal change trend of the serving cell and the signal change trend of the neighboring cell as a reference condition to select the target cell. Referring to FIG. 5, the foregoing terminal also includes:
  • the second detecting module 501 is configured to detect a signal change trend of the serving cell in the preset duration
  • the first triggering module 502 is configured to trigger the second determining module 404 when determining that the signal change trend of the serving cell meets the second state in the preset duration, where the second state is a stable trend and/or Downtrend.
  • the signal change trend of the serving cell and the signal change trend of the neighboring cell are simultaneously used as reference conditions for selecting the target cell, and only when it is determined that the signal change trend of the serving cell in the preset time period satisfies the second state, the first The triggering module 502 triggers the second determining module 404 to determine that a neighboring cell in the set of neighboring cells in which the signal change trend in the candidate target cell set meets the first state is the target cell, so that the signal strength of the serving cell does not rise. Will re-elect the service community, In this way, while ensuring the signal strength of the target cell, the frequency of reselection of the serving cell is reduced, and system resources are saved.
  • the terminal may wait for a set duration before triggering the first determining module. 402.
  • the terminal in the embodiment corresponding to FIG. 5 may further include:
  • the second triggering module 601 is configured to: when it is determined that the signal change trend of the serving cell does not satisfy the second state in the preset duration, wait for the next preset time period, triggering the first determining module 402;
  • the first triggering module 601 waits for the next preset time period to trigger the first determining module 402 to ensure continuity of cell reselection when the condition is not met.
  • the set of candidate target cells that may be determined is an empty set.
  • One of the following is taken as an example, as shown in FIG. 7, as another terminal of the present invention.
  • the foregoing terminal may further include:
  • the first determining module 701 is configured to determine whether the to-be-selected target cell set is an empty set.
  • the third triggering module 702 is configured to trigger the first detecting module 403 when determining that the to-be-selected target cell set is not an empty set;
  • the fourth triggering module 703 is configured to: when it is determined that the to-be-selected target cell set is an empty set, wait for the next preset time period, and trigger the first determining module 402.
  • the third triggering module 702 determines that the first detection module 403 is triggered when the to-be-selected target cell set is not an empty set, and the fourth trigger module waits for the next preset time period, triggering the The first determining module 402 ensures continuity of the cell reselection process when the set of target cells to be selected is an empty set.
  • the second determining module 404 determines that one of the neighboring cells in the set of target cells in which the signal change trend meets the first state is the target cell.
  • the second determining module 404 may Comparing the second strength parameters of the neighboring cells in the set of neighboring cells that satisfy the first state, and determining that the neighboring cell with the second strongest parameter in the set of neighboring cells whose signal change trend satisfies the first state is the target cell, The second determining module 404 in the terminal is specific The second neighboring cell with the largest intensity parameter in the set of neighboring cells in the set of target cells in which the signal change trend meets the first state is determined as the target cell, and the second strength parameter is the signal strength, or The intensity parameter obtained by the calculated signal strength.
  • the second determining module 404 determines, as the target cell, the neighboring cell with the largest second strength parameter in the set of neighboring cells in which the signal change trend in the candidate target cell set meets the first state, It is also possible to select a neighboring cell as a target cell from the set of neighboring cells in which the signal change trend satisfies the first state in the target cell set to be selected according to other setting rules, for example, if the cell reselection frequency is reduced in order to extend the cell reserving time, The determining module 404 may determine that the neighboring cell with the smallest second strength parameter in the set of neighboring cells in the target cell set that meets the first state is the target cell, and according to actual needs, there may be other methods for selecting, This is not a limitation.
  • the second determining module 404 determines that the neighboring cell with the second highest strength parameter in the set of neighboring cells in the set of target cells in which the signal change trend meets the first state is the target cell, and in actual application, The second determining module 404 can be executed by a plurality of units in stages. Please refer to FIG. 8 as another embodiment of the terminal in the embodiment of the present invention. In the terminal corresponding to the embodiment of FIG. 7, the second determining module 404 is specifically include:
  • the selecting unit 801 is configured to select, as the first neighboring cell, a neighboring cell with the highest signal strength from the set of target cells to be selected;
  • the determining unit 802 is configured to determine whether a signal change trend of the first neighboring cell meets the first state
  • the triggering unit 803 is configured to: when determining that a signal change trend of the first neighboring cell does not satisfy the first state, remove the first neighboring cell from the to-be-selected target cell set, and update the to-be-selected a target cell set, re-trigger the selection unit 801;
  • the determining unit 804 is configured to determine, when the first neighboring cell meets the first state, that the first neighboring cell is the target cell.
  • the candidate target cell becomes an empty set, and the terminal can wait for the next cycle and then trigger.
  • the terminal uses the signal change trend of the neighboring cell to perform cell reselection.
  • the cell reselection can be used in various scenarios. In practical applications, the terminal can first determine whether it is in a high-speed motion state, and only use the signal change trend to perform cell reselection in a high-speed motion state, as shown in FIG.
  • the terminal further includes:
  • the fifth triggering module 902 is configured to trigger the acquiring module 401 when determining that the terminal is in a high speed motion state.
  • the second determining module 901 first determines whether the terminal is in a high-speed motion state, and only when in the high-speed motion state, the fifth triggering module 902 triggers the acquiring module 401 to start the cell reselection by using the trend judging method; otherwise,
  • the existing hysteresis determination mode is used for cell reselection, so that the frequency of cell reselection is significantly reduced in the non-high-speed motion state, and in the high-speed motion state, the short-time network drop phenomenon is avoided, and the terminal is strengthened. Applicability, so that it can better achieve the balance between communication quality and system overhead in various application scenarios.
  • the second determining module 901 determines whether the terminal is in a high-speed motion state.
  • the terminal is in a high-speed motion state.
  • the second determining module 901 is specifically configured to: detect, by using a sensor, a speed value of the terminal, and when the speed value of the terminal is greater than a preset speed threshold, determine that the terminal is in the high-speed motion state.
  • the second determining module 901 is specifically configured to: detect whether the offset value of the automatic frequency control of the terminal in the preset duration is greater than a preset offset value, and when the automatic frequency control of the terminal is preset When the offset value in the duration is greater than the preset offset value, it is determined that the terminal is in the high speed motion state.
  • the sensor in the second judging module 901 detects that the current speed value of the terminal is 250 KM/h, which is greater than the preset speed threshold value of 200 KM/h, and the second judging module 901 determines that the current state is in a high motion state, triggering the obtaining module 401;
  • the obtaining module 401 obtains the signal strengths of the serving cell A and the neighboring cell according to the preset time period of 1 second. If the current time is 8.2 seconds, the acquiring module 401 has acquired the 0th, 1st, 2nd, and 2nd. 3, 4, 5, 6, 7, 8 seconds of signal strength of the serving cell and the neighboring cell;
  • the first determining module 402 selects four adjacent cells of the neighboring cells D, E, F, and G of the serving cell to form a candidate target cell set, wherein the eighth second serving cell A
  • the signal strength is -80dBm
  • the signal strength of the neighboring cell D is -60dBm
  • the signal strength of the neighboring cell E is -63dBm
  • the signal strength of the neighboring cell F is -50dBm
  • the signal strength of the neighboring cell G is -62dBm;
  • the second detecting module 501 detects a signal change trend of the serving cell from the 3rd second to the 8th second (with a preset duration of 5 seconds), and obtains: the signal strength of the serving cell A in the 3rd second is -45dBm, and the 4th second serving cell
  • the signal strength of A is -47dBm
  • the signal strength of the serving cell A is -50dBm in the 5th second
  • the signal strength of the serving cell A is -60dBm in the 6th second
  • the signal strength of the serving cell A in the 7th second is -70dBm
  • the 8th second The signal strength of the serving cell A is -80 dBm
  • the signal change trend of the serving cell from the 3rd second to the 8th second is determined to be a downward trend
  • the first detecting module 403 detects a signal change trend of the neighboring cell in the target cell set to be selected from the 3rd to the 8th, and obtains an upward trend of the neighboring cell D from the 3rd to the 8th, and the neighboring cell E For the upward trend, the neighboring cell F is in a stable trend, and the neighboring cell G is in a downward trend;
  • the first triggering module 502 triggers the second determining module 404, and the second determining module 404 selects the target cell set to be selected.
  • the neighboring cell (neighboring cell D) having the strongest signal strength among the neighboring cell sets (the neighboring cell D and the neighboring cell E) satisfying the rising trend is the target cell;
  • the reselection module 405 reselects the serving cell to the target cell (neighboring cell D).
  • another embodiment of the terminal 1000 in the embodiment of the present invention includes:
  • the input device 1001, the output device 1002, the processor 1003, and the memory 1004 (wherein the number of the processors 1003 in the terminal 1000 may be one or more, and one processor 1003 in FIG. 10 is taken as an example).
  • the input device 1001, the output device 1002, the processor 1003, and the memory 1004 may be connected by a bus or other means, wherein the connection through the bus is taken as an example in FIG.
  • the processor 1003 is configured to perform the following steps by calling an operation instruction stored in the memory 1004:
  • a neighboring cell in the set of neighboring cells whose signal change trend satisfies the first state is a target cell, where the first state is a steady trend and/or an upward trend;
  • the processor 1003 further performs the following steps:
  • the processor 1003 specifically performs the following steps:
  • the terminal Determining, by the terminal, that a signal change trend of the serving cell in the preset target cell length meets a second state, the terminal determining, in the candidate target cell set, a neighboring cell in a set of neighboring cells that meets a first state For the target cell, the second state is a steady trend and/or a downward trend;
  • the processor 1003 further performs the following steps:
  • the processor 1003 further performs the following steps:
  • the processor 1003 specifically performs the following steps:
  • the neighboring cell having the second highest strength parameter is the target cell, and the second strength parameter is the signal strength, or is calculated by the signal strength.
  • the processor 1003 specifically performs the following steps:
  • the first neighboring cell When it is determined that the signal change trend of the first neighboring cell does not satisfy the first state, the first neighboring cell is removed from the to-be-selected target cell set, and the candidate target cell set is updated, and the device is re-triggered. And the step of selecting, as the first neighboring cell, the neighboring cell with the strongest signal strength from the set of target cells to be selected;
  • the processor 1003 further performs the following steps:
  • the processor 1003 specifically performs the following steps:
  • the processor 1003 specifically performs the following steps:
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or Some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明实施例公开了一种目标小区选择方法和终端，用于解决在高速移动的场景中频繁出现的短时掉网问题。本发明实施例方法包括：终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势，确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势，将服务小区重选到所述目标小区。

Description

一种目标小区选择方法和终端 技术领域
本发明涉及通讯技术领域，尤其涉及一种小区重选中目标小区选择方法和终端。
背景技术
小区重选是蜂窝移动通信系统最基础的过程之一，手机移动过程中需要不断进行小区重选，以保证服务质量。在小区重选的过程中，及时选择到合适的目标小区直接决定了手机的驻网性能。
针对特定制式(例如GSM)，一种典型的小区重选过程如下:为了避免出现频繁的乒乓重选，小区重选准则是通过迟滞信号强度(通常为3分贝毫伏dBm)和迟滞时间(通常设置为5s)两个参数来控制终端的小区重选行为：当目标小区的接收信号强度(例如-72dBm)大于服务小区的信号强度(-80dBm)加上迟滞信号强度(3dBm)，且持续时间大于迟滞时间(例如5s)后，则启动小区重选，否则继续驻留在当前的服务小区。
在高速移动的场景中(例如高铁覆盖网络中)，当用户乘坐疾驰的汽车、火车(特别是高铁时)，由于终端移动速度过快，小区信号可能快速变化，通常是服务小区的信号快速降低，而目标小区的信号快速增加，会频繁的出现这样的情况：在重选小区的判定过程中，持续时间还没有达到迟滞时间，终端已经离开了当前的服务小区的覆盖范围，而重选小区的判定还没有完成，在服务小区不能提供服务以后，终端还没有接入信号较好的目标小区，在短暂掉网后才接入目标小区，短暂的掉网使得用户无法享受通信服务，或者正在进行的通信服务中断，直接造成用户体验降低。
发明内容
本发明实施例提供了一种目标小区选择方法和终端，用于解决在高速移动的场景中频繁出现的短时掉网问题。
本发明实施例第一方面提供了一种目标小区选择方法，包括：
终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
所述终端确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
所述终端确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
所述终端将服务小区重选到所述目标小区。
结合本发明实施例的第一方面，本发明实施例第一方面的第一种实现方式中，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区的步骤之前还包括：
所述终端检测所述预置时长内服务小区的信号变化趋势；
所述终端确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区包括：
当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第二状态为稳定趋势和/或下降趋势。
结合本发明实施例第一方面的第一种实现方式，本发明实施例第一方面的第二种实现方式中，所述终端检测所述预置时长内服务小区的信号变化趋势的步骤之后还包括：
当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，所述终端等待下一个预置时间周期，触发所述终端确定待选目标小区集合的步骤。
结合本发明实施例的第一方面至第一方面的第二种实现方式中的任一种 实现方式，本发明实施例第一方面的第三种实现方式中，所述终端选取特定时刻的第一强度参数大于服务小区的邻小区，组成待选目标小区集合的步骤之后还包括：
所述终端判断所述待选目标小区集合是否为空集；
当确定所述待选目标小区集合不为空集时，触发所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势的步骤；
当确定所述待选目标小区集合为空集时，所述终端等待下一个预置时间周期，触发所述终端确定待选目标小区集合的步骤。
结合本发明实施例的第一方面至第一方面的第三种实现方式中的任一种实现方式，本发明实施例第一方面的第四种实现方式中，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区具体包括：
所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
结合本发明实施例第一方面的第四种实现方式，本发明实施例第一方面的第五种实现方式中，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区包括：
所述终端从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
所述终端判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述终端从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区的步骤；
当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
结合本发明实施例的第一方面至第一方面的第五种实现方式中的任一种实现方式，本发明实施例第一方面的第六种实现方式中，所述终端按照预置时 间周期获取服务小区的信号强度和邻小区的信号强度的步骤之前还包括：
所述终端判断所述终端是否处于高速运动状态；
当确定所述终端处于高速运动状态时，触发所述终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度的步骤。
结合本发明实施例第一方面的第六种实现方式，本发明实施例第一方面的第七种实现方式中，所述终端判断所述终端是否处于高速运动状态包括：
所述终端通过传感器检测所述终端的速度值；
当所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
结合本发明实施例第一方面的第六种实现方式，本发明实施例第一方面的第八种实现方式中，所述终端判断自身是否处于高速运动状态包括：
所述终端检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值；
当所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
本发明实施例第二方面提供了一种终端，包括：
获取模块，用于按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
第一确定模块，用于确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
第一检测模块，用于检测所述特定时刻之前的预置时长内所述第一确定模块确定的待选目标小区集合中的邻小区的信号变化趋势；
第二确定模块，用于确定所述待选目标小区集合中，所述第一检测模块检测出的信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
重选模块，用于将服务小区重选到所述第二确定模块确定的目标小区。
结合本发明实施例的第二方面，本发明实施例第二方面的第一种实现方式中，所述终端还包括：
第二检测模块，用于检测所述预置时长内服务小区的信号变化趋势；
第一触发模块，用于当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，触发所述第二确定模块，所述第二状态为稳定趋势和/或下降趋势。
结合本发明实施例第二方面的第一种实现方式，本发明实施例第二方面的第二种实现方式中，所述终端还包括：
第二触发模块，用于当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，等待下一个预置时间周期，触发所述第一确定模块。
结合本发明实施例的第二方面至第二方面的第二种实现方式中的任一种实现方式，本发明实施例第二方面的第三种实现方式中，所述终端还包括：
第一判断模块，用于判断所述待选目标小区集合是否为空集；
第三触发模块，用于当确定所述待选目标小区集合不为空集时，触发所述第一检测模块；
第四触发模块，用于当确定所述待选目标小区集合为空集时，等待下一个预置时间周期，触发所述第一确定模块。
结合本发明实施例的第二方面至第二方面的第三种实现方式中的任一种实现方式，本发明实施例第二方面的第四种实现方式中，所述第二确定模块具体用于，确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
结合本发明实施例第二方面的第四种实现方式，本发明实施例第二方面的第五种实现方式中，所述第二确定模块具体包括：
选取单元，用于从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
判断单元，用于判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
触发单元，用于当确定所述第一邻小区的信号变化趋势不满足所述第一状 态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述选取单元；
确定单元，用于当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
结合本发明实施例的第二方面至第二方面的第五种实现方式中的任一种实现方式，本发明实施例第二方面的第六种实现方式中，所述终端还包括：
第二判断模块，用于判断所述终端是否处于高速运动状态；
第五触发模块，用于当确定所述终端处于高速运动状态时，触发所述获取模块。
结合本发明实施例第二方面的第六种实现方式，本发明实施例第二方面的第七种实现方式中，所述第二判断模块具体用于，通过传感器检测所述终端的速度值，当所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
结合本发明实施例第二方面的第六种实现方式，本发明实施例第二方面的第八种实现方式中，所述第二判断模块具体用于，检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值，当所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
本发明实施例第三方面提供了一种终端，包括：
输入装置、输出装置、处理器和存储器；
通过调用所述存储器存储的操作指令，所述处理器用于执行如下步骤：
按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信 号变化趋势；
确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
将服务小区重选到所述目标小区。
结合本发明实施例的第三方面，本发明实施例第三方面的第一种实现方式中，所述处理器还执行如下步骤：
检测所述预置时长内服务小区的信号变化趋势；
所述处理器具体执行如下步骤：
当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第二状态为稳定趋势和/或下降趋势。
结合本发明实施例第三方面的第一种实现方式，本发明实施例第三方面的第二种实现方式中，所述处理器还执行如下步骤：
当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，等待下一个预置时间周期，触发所述确定待选目标小区集合的步骤。
结合本发明实施例的第三方面至第三方面的第二种实现方式中的任一种实现方式，本发明实施例第三方面的第三种实现方式中，所述处理器还执行如下步骤：
判断所述待选目标小区集合是否为空集；
当确定所述待选目标小区集合不为空集时，触发所述检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势的步骤；
当确定所述待选目标小区集合为空集时，等待下一个预置时间周期，触发所述确定待选目标小区集合的步骤。
结合本发明实施例的第三方面至第三方面的第三种实现方式中的任一种实现方式，本发明实施例第三方面的第四种实现方式中，所述处理器具体执行如下步骤：
确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
结合本发明实施例第三方面的第四种实现方式，本发明实施例第三方面的第五种实现方式中，所述处理器具体执行如下步骤：
从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区的步骤；
当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
结合本发明实施例的第三方面至第三方面的第五种实现方式中的任一种实现方式，本发明实施例第三方面的第六种实现方式中，所述处理器还执行如下步骤：
判断所述终端是否处于高速运动状态；
当确定所述终端处于高速运动状态时，触发所述按照预置时间周期获取服务小区的信号强度和邻小区的信号强度的步骤。
结合本发明实施例第三方面的第六种实现方式，本发明实施例第三方面的第七种实现方式中，所述处理器具体执行如下步骤：
通过传感器检测所述终端的速度值；
当确定所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
结合本发明实施例第三方面的第六种实现方式，本发明实施例第三方面的第八种实现方式中，所述处理器具体执行如下步骤：
检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值；
当确定所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
从以上技术方案可以看出，本发明实施例具有以下优点：本发明实施例中终端通过判断邻小区的信号变化趋势来实现服务小区的重选，具体的，终端按 照预置时间周期获取服务小区的信号强度和邻小区的信号强度，选取特定时刻的第一强度参数大于服务小区的邻小区，组成待选目标小区集合，该第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数，该特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，则待选目标小区集合中的邻小区在该特定时刻的信号强度均比较好，终端检测该特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势，确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，该第一状态为稳定趋势和/或上升趋势，即目标小区的信号强度较好，且可能信号强度会不断增强，则终端直接将服务小区重选到该目标小区，不再需要经过迟滞时间的判定，使得终端能够在信号快速变化的情况下及时重选到适合的目标小区，提升了网络驻留的信号质量，减少了短时掉网次数，提升了终端的呼通率。
附图说明
图1为本发明实施例中目标小区选择方法一个流程示意图；
图2为本发明实施例中目标小区选择方法另一个流程示意图；
图3为本发明实施例中目标小区选择方法另一个流程示意图；
图4为本发明实施例中终端一个结构示意图；
图5为本发明实施例中终端另一个结构示意图；
图6为本发明实施例中终端另一个结构示意图；
图7为本发明实施例中终端另一个结构示意图；
图8为本发明实施例中终端另一个结构示意图；
图9为本发明实施例中终端另一个结构示意图；
图10为本发明实施例中终端另一个结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有做出创造性劳 动前提下所获得的所有其他实施例，都属于本发明保护的范围。
此处在本发明的描述中使用的术语是用于描述特定实施例的目的并且不旨在作为对本发明的限制。
术语“特定时刻”为最近获取到服务小区的信号强度和邻小区的信号强度的时刻。例如，终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，假设该预置时间周期为1秒，从0秒开始获取服务小区和邻小区的信号强度，则随着时间的推移，每隔1秒获取一次服务小区和邻小区的信号强度(例如在第1秒，第2秒，第3秒等)，假设此时为第8秒，终端获取了一次服务小区和邻小区的信号强度，则此时该第8秒为特定时刻，假设此时为第8.3秒(第8秒与第9秒之间的任一个时刻)，则此时特定时刻还是第8秒，假设随着时间的推移到了第9秒，由获取了一次服务小区的信号强度和邻小区的信号强度，则此时特定时刻为第9秒。
术语“稳定趋势”表示信号强度稳定，即信号强度的变化范围在预置强度阈值内，例如信号强度的变化范围在2分贝毫伏(decibel-mV，dBm)以内，当前该预置强度阈值还可以取其他值，可以根据实际应用情况设定，此处不作限定。
术语“上升趋势”表示信号强度连续上升，且在特定时长内的上升幅度超过第一预置信号强度，该第一预置信号强度可以根据实际应用情况设定，此处不作限定。
术语“下降趋势”表示信号强度连续下降，且在特定时间内的下降幅度超过第二预置信号强度，该第二预置信号强度可以根据实际应用情况设定，此处不作限定。
请参阅图1，本发明实施例中目标小区选择方法一个实施例包括：
101、终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度；
当终端处于正常驻留网络状态时，终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，该服务小区为终端当前驻留的小区，该邻小区为终端能接收到信号的小区。
可以理解的是，终端可以获取到从最开始获取直到当前时刻，这个时间段 内以预置时间周期为间隔的服务小区和邻小区的信号强度，例如从第0秒开始获取，当前时刻是第6.3秒，预置时间周期是2秒，则终端获取到了第0秒，第2秒，第4秒和第6秒的服务小区和邻小区的信号强度。
需要说明的是，该预置时间周期可以根据实际情况设定，例如可以设定为1秒，也可以设定为0.5秒等，还可以设定为其他值，此处不作限定。
102、终端确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区；
终端按照预置时间周期获取到服务小区的信号强度和邻小区的信号强度后，终端可以将特定时刻服务小区的第一强度参数与该特定时刻的各个邻小区的第一强度参数进行比较，将该特定时刻第一强度参数大于服务小区的邻小区组成待选目标小区集合，该特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，该第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
可以理解的是，该特定时刻与步骤102的执行时刻有区别，步骤102的执行时刻可能是在该特定时刻，也可能不在该特定时刻，此处不作限定。例如若从0秒开始，按照预置时间周期1秒获取服务小区的信号强度和邻小区的信号强度，若步骤102的执行时刻为第6.4秒，则终端最近一次获取服务小区的信号强度和邻小区的信号强度的时刻是第6秒，则这种情况中步骤102的执行时刻为第6.4秒，而该特定时刻为第6秒；若步骤102的执行时刻为第8秒，则终端最近一次获取服务小区的信号强度和邻小区的信号强度的时刻是第8秒，则这种情况中步骤102的执行时刻与特定时刻相同，都是第8秒。
103、所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
终端得到待选目标小区集合后，检测该特定时刻之前的预置时长内待选目标小区集合中邻小区的信号变化趋势，该信号变化趋势包括稳定趋势，上升趋势或下降趋势。
可以理解的是，因为要检测待选目标小区集合中邻小区的信号变化趋势，因此作为检测的时长的预置时长需大于预置时间周期且能检测到信号变化趋势，即该预置时长内应至少能对服务小区的信号强度和邻小区的信号强度检测 三次，进一步的，该预置时长的终点可以是该特定时间之前的某个时刻，只需要该预置时长内的信号变化趋势能在一定程度上反应该特定时刻的信号变化趋势，当然，该预置时长的终点距该特定时刻越近，越能反应出该特定时刻的信号变化趋势，可以根据实际应用情况来对该预置时长和预置时长的终点进行设定。优选的，该预置时长的终点为该特定时刻。例如若从第0秒开始获取，当前时刻是第6秒，预置时间周期为1秒，该预置时长可以为5秒，则终端检测从第1秒到第6秒这5秒内待选目标小区集合中的邻小区的信号变化趋势；若当前时刻为第8秒，则终端检测从第3秒到第8秒这5秒内待选目标小区集合中邻小区的信号变化趋势，该预置时长也可以根据实际应用情况设定，只要能判定该预置时长内邻小区的信号变化趋势即可。
104、终端确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
终端检测到该预置时长内待选目标小区集合中邻小区的信号变化趋势后，确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，该第一状态为稳定趋势和/或上升趋势；
可以理解的是，这里有三种方式：
第一种是终端确定待选目标小区集合中，信号变化趋势满足稳定趋势的邻小区集合中的一个邻小区为目标小区；
第二种是终端确定待选目标小区集合中信号变化趋势满足上升趋势的邻小区集合中的一个邻小区为目标小区；
第三种是终端确定待选目标小区集合中信号变化趋势满足稳定趋势的邻小区与满足上升趋势的邻小区的组成邻小区集合中的一个邻小区为目标小区。
根据实际应用的需求，可以从中选取合适的方式，此处不作限定。
105、所述终端将服务小区重选到所述目标小区。
终端确定目标小区后，将服务小区重选到该目标小区。
本发明实施例中终端通过判断邻小区的信号变化趋势来实现服务小区的重选，其基础在于经过对高铁上抓取的小区信号强度的分析发现：单小区的典型驻留时间为20s；在掉网或重选发生前，服务小区的信号持续较差 (RSRP/-90dBm)或突然变差；而邻小区的信号强度变化呈现规律性。具体的，终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，选取特定时刻的第一强度参数大于服务小区的邻小区，组成待选目标小区集合，该第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数，该特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，则待选目标小区集合中的邻小区在该特定时刻的信号强度均比较好，终端检测该特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势，确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，该第一状态为稳定趋势和/或上升趋势，即目标小区的信号强度较好，且可能信号强度会不断增强，则终端直接将服务小区重选到该目标小区，不再需要经过迟滞时间的判定，使得终端能够在信号快速变化的情况下及时重选到适合的目标小区，提升了网络驻留的信号质量，减少了短时掉网次数，提升了终端的呼通率。
上面实施例中，终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，而此时服务小区的信号变化趋势可能是上升趋势，也可能是稳定趋势，还可能是下降趋势，在实际应用中，在将待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区确定为目标小区之前，还可以先判断服务小区的信号变化趋势，将服务小区的信号变化趋势和邻小区的信号变化趋势同时作为参考条件来进行目标小区的选择，请参阅图2，本发明实施例中目标小区选择方法另一个实施例包括：
201、终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度；
当终端处于正常驻留网络状态时，终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，该服务小区为终端当前驻留的小区，该邻小区为终端能接收到信号的小区。
可以理解的是，终端可以获取到从最开始获取直到当前时刻，这个时间段内以预置时间周期为间隔的服务小区和邻小区的信号强度，例如从第0秒开始获取，当前时刻是第6.3秒，预置时间周期是2秒，则终端获取到了第0秒， 第2秒，第4秒和第6秒的服务小区和邻小区的信号强度。
需要说明的是，该预置时间周期可以根据实际情况设定，例如可以设定为1秒，也可以设定为0.5秒等，还可以设定为其他值，此处不作限定。
202、终端确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区；
终端按照预置时间周期获取到服务小区的信号强度和邻小区的信号强度后，终端可以将特定时刻服务小区的第一强度参数与该特定时刻的各个邻小区的第一强度参数进行比较，将该特定时刻第一强度参数大于服务小区的邻小区组成待选目标小区集合，该特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，该第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
当该第一强度参数为信号强度经过运算得到的强度参数时，具体的运算方式可以有很多种，例如该第一强度参数可以由信号强度Rxlev减去小区基站的接受灵敏度RXLEV_ACCESS_MIN得到，也可以由信号强度减去小区基站的接受灵敏度与设定权值(例如40％)的积得到，根据实际应用的需求不同，还可能由信号强度与其他的小区基站的参数经过运算得到，此处不作限定。
可以理解的是，该特定时刻与步骤202的执行时刻有区别，步骤202的执行时刻可能是在该特定时刻，也可能不在该特定时刻，此处不作限定。例如若从0秒开始，按照预置时间周期1秒获取服务小区的信号强度和邻小区的信号强度，若步骤202的执行时刻为第6.4秒，则终端最近一次获取服务小区的信号强度和邻小区的信号强度的时刻是第6秒，则这种情况中步骤202的执行时刻为第6.4秒，而该特定时刻为第6秒；若步骤202的执行时刻为第8秒，则终端最近一次获取服务小区的信号强度和邻小区的信号强度的时刻是第8秒，则这种情况中步骤202的执行时刻与特定时刻相同，都是第8秒。
203、终端判断该待选目标小区集合是否为空集；
终端得到待选目标小区集合后，判断该待选目标小区集合是否为空集；
当确定该待选目标小区集合不为空集时，触发步骤204；
当确定该待选目标小区集合为空集时，则表明当前周期的当前时刻没有信号强度大于服务小区的邻小区，该终端等待下一个预置时间周期，再触发步骤 202。
可以理解的是，为了节省终端的开销，当确定待选目标小区集合为空集时，也可以不只是等待一个预置时间周期就触发步骤202，可以等待更长的时间，例如两个，三个预置时间周期或更多，再触发步骤202，可以根据实际需求设定，此处不作限定。
204、所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
终端得到待选目标小区集合，并确定该待选目标小区集合不为空集后，检测特定时刻之前的预置时长内待选目标小区集合中邻小区的信号变化趋势，该信号变化趋势为信号强度的变化趋势，该信号变化趋势包括稳定趋势，上升趋势或下降趋势。
可以理解的是，因为要检测待选目标小区集合中邻小区的信号变化趋势，因此作为检测的时长的预置时长需大于预置时间周期且能检测到信号变化趋势，即该预置时长内应至少能对服务小区的信号强度和邻小区的信号强度检测三次，进一步的，该预置时长的终点可以是该特定时间之前的某个时刻，只需要该预置时长内的信号变化趋势能在一定程度上反应该特定时刻的信号变化趋势，当然，该预置时长的终点距该特定时刻越近，越能反应出该特定时刻的信号变化趋势，可以根据实际应用情况来对该预置时长和预置时长的终点进行设定。优选的，该预置时长的终点为该特定时刻。例如若从第0秒开始获取，当前时刻是第6秒，预置时间周期为1秒，该预置时长可以为5秒，则终端检测从第1秒到第6秒这5秒内待选目标小区集合中的邻小区的信号变化趋势；若当前时刻为第8秒，则终端检测从第3秒到第8秒这5秒内待选目标小区集合中邻小区的信号变化趋势，该预置时长也可以根据实际应用情况设定，只要能判定该预置时长内邻小区的信号变化趋势即可。
205、所述终端检测所述预置时长内服务小区的信号变化趋势；
终端获取到预置时长内服务小区的信号强度后，可以检测该预置时长内服务小区的信号变化趋势。
可以理解的是，步骤205与步骤204之间的执行顺序并不限定，步骤205可以在步骤204之前执行，可以在步骤204之后执行，还可以与步骤204同时 执行，此处不作限定。
206、所述终端判断该预置时长内服务小区的信号变化趋势是否满足第二状态，该第二状态为稳定和/或下降趋势；
该终端检测预置时长内服务小区的信号变化趋势后，判断该预置时长内服务小区的信号变化趋势是否满足第二状态。
可以理解的是，第二状态为稳定和/或下降趋势，因此此处确定服务小区的信号变化趋势满足第二状态有三种方式：
第一种：当确定该预置时长内服务小区的信号变化趋势满足稳定趋势时，确定该该预置时长内服务小区的信号变化趋势满足第二状态；
第二种：当确定该预置时长内服务小区的信号变化趋势满足下降趋势时，确定该该预置时长内服务小区的信号变化趋势满足第二状态；
第三种：当确定该预置时长内服务小区的信号变化趋势满足下降趋势与满足稳定趋势时，均确定该该预置时长内服务小区的信号变化趋势满足第二状态；
根据实际应用的需求，可以从中选取合适的方式，此处不作限定。而一般情况下，若需要减少小区重选的频率，优选其中的第二种方式；若需要最大可能保证终端不断网，优选其中的第三种方式。
当确定该预置时长内服务小区的信号变化趋势满足第二状态时，触发步骤207；
当确定该预置时长内服务小区的信号变化趋势不满足第二状态时，表明由该特定时刻确定的该预置时长内的服务小区的信号变化趋势不满足重选要求，还没到重选服务小区的时机，该终端可以等待下一个周期，触发步骤202。
207、终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
测到该预置时长内待选目标小区结合中邻小区的信号变化趋势后，当确定该预置时长内服务小区的信号变化趋势满足第二状态时，终端确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，该第一状态为稳定趋势和/或上升趋势；
可以理解的是，这里确定邻小区的信号变化趋势满足第一状态也有三种方式：
第一种是终端确定待选目标小区集合中，信号变化趋势满足稳定趋势的邻小区集合中的一个邻小区为目标小区；
第二种是终端确定待选目标小区集合中信号变化趋势满足上升趋势的邻小区集合中的一个邻小区为目标小区；
第三种是终端确定待选目标小区集合中信号变化趋势满足稳定趋势的邻小区与满足上升趋势的邻小区的组成邻小区集合中的一个邻小区为目标小区。
根据实际应用的需求，可以从中选取合适的方式，此处不作限定。一般情况下，为了保证目标小区信号优秀，优选第二种方式；若为了最大可能的保证终端不断网，优选其中的第三种方式。
可以理解的是，服务小区的信号变化趋势满足第二状态有三种方式，邻小区的信号变化趋势满足第一状态也有三种方式，它们之间可以根据实际需求进行任意组合以达到不同的效果，例如若为了保证目标小区信号优选，且减少小区重选的频率，可以优选服务小区的信号变化趋势满足第二状态中的第二种方式和邻小区的信号变化趋势满足第一状态中的第二种方式进行组合，根据具体情况，为了达到其他效果，还可以进行其他的各种方式的组合，此处不作限定。
208、所述终端将服务小区重选到所述目标小区。
终端确定目标小区后，将服务小区重选到该目标小区。
可以理解的是，终端将服务小区重选到目标小区后，可以等待下一个预置时间周期，触发步骤202，开始新一轮的重选判断，也可以等待更长的时间，再开始新一轮的重选判断，具体等待的时长，可以根据实际的需求来确定，此处不作限定。
本发明实施例中，终端将服务小区的信号变化趋势与邻小区的信号变化趋势同时作为选取目标小区的参考条件，只有当确定该预置时长内服务小区的信号变化趋势满足第二状态时，终端才确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，这样服务小区的信号强度在上升时便不会进行服务小区的重选，这样在保证了目标小区的信号强度的同时，降低了服务小区重选的频率，节省了系统资源。
可以理解的是，在实际应用中，根据实际情况的需求，也可以只将邻小区的信号变化趋势作为参考条件，无论服务小区的信号变化趋势是否满足上升趋势，只要邻小区的信号变化趋势满足第二状态，均进行后续目标小区选择的判断，此处不作限定。
上面实施例中，终端利用邻小区的信号变化趋势来进行小区重选，该方式进行小区重选可以用于各种场景中，在实际应用中，终端可以先判断是否处于高速运动状态，只有处于高速运动状态才利用信号变化趋势来进行小区重选，另一方面，上面实施例中，确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，在实际应用中，可以对信号变化趋势满足第一状态的邻小区集合中的邻小区的第二强度参数进行比较，确定信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，请参阅图3，本发明实施例中目标小区选择方法另一个实施例包括：
301、终端判断该终端是否处于高速运动状态；
当终端处于正常驻网状态时，终端判断该终端是否处于高速运动状态；
当确定处于高速运动状态时，触发步骤302；
当确定不处于高速运动状态时，触发步骤310。
可以理解的是，判断终端是否处于高速运动状态的方式有多种：
可选的，终端可以通过传感器检测所述终端的速度值，当所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
可选的，所述终端可以检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值；当所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
还可以有很多其他的判断该终端是否处于高速运动状态的方式，此处不作限定。
302、终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度；
当确定该终端处于高速运动状态时，终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，该服务小区为终端当前驻留的小区，该邻小区为终端能接收到信号的小区。
可以理解的是，终端可以获取到从最开始获取直到当前时刻，这个时间段内以预置时间周期为间隔的服务小区和邻小区的信号强度，例如从第0秒开始获取，当前时刻是第6.3秒，预置时间周期是2秒，则终端获取到了第0秒，第2秒，第4秒和第6秒的服务小区和邻小区的信号强度。
需要说明的是，该预置时间周期可以根据实际情况设定，例如可以设定为1秒，也可以设定为0.5秒等，还可以设定为其他值，此处不作限定。
本实施例中，优选的，该预置时间周期为0.47秒。
303、终端确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区；
终端按照预置时间周期获取到服务小区的信号强度和邻小区的信号强度后，终端可以将特定时刻服务小区的第一强度参数与该特定时刻的各个邻小区的第一强度参数进行比较，将该特定时刻第一强度参数大于服务小区的邻小区组成待选目标小区集合，该特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，该第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
当该第一强度参数为信号强度经过运算得到的强度参数时，具体的运算方式可以有很多种，例如该第一强度参数可以由信号强度Rxlev减去小区基站的接受灵敏度RXLEV_ACCESS_MIN得到，也可以由信号强度减去小区基站的接受灵敏度与设定权值(例如40％)的积得到，根据实际应用的需求不同，还可能由信号强度与其他的小区基站的参数经过运算得到，此处不作限定。
本实施例中，优选的，该第一强度参数为信号强度Rxlev减去小区基站的接受灵敏度RXLEV_ACCESS_MIN。
可以理解的是，该特定时刻与步骤303的执行时刻有区别，步骤303的执行时刻可能是在该特定时刻，也可能不在该特定时刻，此处不作限定。例如若从0秒开始，按照预置时间周期1秒获取服务小区的信号强度和邻小区的信号强度，若步骤303的执行时刻为第6.4秒，则终端最近一次获取服务小区的信号强度和邻小区的信号强度的时刻是第6秒，则这种情况中步骤303的执行时刻为第6.4秒，而该特定时刻为第6秒；若步骤303的执行时刻为第8秒，则终端最近一次获取服务小区的信号强度和邻小区的信号强度的时刻是第8秒， 则这种情况中步骤303的执行时刻与特定时刻相同，都是第8秒。
304、终端判断该待选目标小区集合是否为空集；
终端得到待选目标小区集合后，判断该待选目标小区集合是否为空集；
当确定该待选目标小区集合不为空集时，触发步骤305；
当确定该待选目标小区集合为空集时，则表明当前周期的当前时刻没有信号强度大于服务小区的邻小区，该终端等待下一个预置时间周期，再触发步骤303。
可以理解的是，为了节省终端的开销，当确定待选目标小区集合为空集时，也可以不只是等待一个预置时间周期就触发步骤303，可以等待更长的时间，例如两个，三个预置时间周期或更多，再触发步骤303，可以根据实际需求设定，此处不作限定。
305、所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
终端得到待选目标小区集合，并确定该待选目标小区集合不为空集后，检测特定时刻之前的预置时长内待选目标小区集合中邻小区的信号变化趋势，该信号变化趋势为信号强度的变化趋势，该信号变化趋势包括稳定趋势，上升趋势或下降趋势。
可以理解的是，因为要检测待选目标小区集合中邻小区的信号变化趋势，因此作为检测的时长的预置时长需大于预置时间周期且能检测到信号变化趋势，即该预置时长内应至少能对服务小区的信号强度和邻小区的信号强度检测三次，进一步的，该预置时长的终点可以是该特定时间之前的某个时刻，只需要该预置时长内的信号变化趋势能在一定程度上反应该特定时刻的信号变化趋势，当然，该预置时长的终点距该特定时刻越近，越能反应出该特定时刻的信号变化趋势，可以根据实际应用情况来对该预置时长和预置时长的终点进行设定。优选的，该预置时长的终点为该特定时刻。例如若从第0秒开始获取，当前时刻是第6秒，预置时间周期为1秒，该预置时长可以为5秒，则终端检测从第1秒到第6秒这5秒内待选目标小区集合中的邻小区的信号变化趋势；若当前时刻为第8秒，则终端检测从第3秒到第8秒这5秒内待选目标小区集合中邻小区的信号变化趋势，该预置时长也可以根据实际应用情况设定，只要 能判定该预置时长内邻小区的信号变化趋势即可。
本实施例中，优选的，该预置时长为5秒。
306、所述终端检测所述预置时长内服务小区的信号变化趋势；
终端获取到预置时长内服务小区的信号强度后，可以检测该预置时长内服务小区的信号变化趋势。
可以理解的是，步骤306与步骤305之间的执行顺序并不限定，步骤306可以在步骤305之前执行，可以在步骤305之后执行，还可以与步骤305同时执行，此处不作限定。
307、所述终端判断该预置时长内服务小区的信号变化趋势是否满足第二状态，该第二状态为稳定和/或下降趋势；
该终端检测预置时长内服务小区的信号变化趋势后，判断该预置时长内服务小区的信号变化趋势是否满足第二状态。
可以理解的是，第二状态为稳定和/或下降趋势，因此此处确定服务小区的信号变化趋势满足第二状态有三种方式：
第一种：当确定该预置时长内服务小区的信号变化趋势满足稳定趋势时，确定该该预置时长内服务小区的信号变化趋势满足第二状态；
可选的，在这种方式中，还可以进一步的限定，当确定该预置时长内服务小区的信号变化趋势满足稳定趋势且小于第一信号强度阈值时，确定该该预置时长内服务小区的信号变化趋势满足第二状态；
第二种：当确定该预置时长内服务小区的信号变化趋势满足下降趋势时，确定该该预置时长内服务小区的信号变化趋势满足第二状态；
第三种：当确定该预置时长内服务小区的信号变化趋势满足下降趋势与满足稳定趋势时，均确定该该预置时长内服务小区的信号变化趋势满足第二状态；
根据实际应用的需求，可以从中选取合适的方式，此处不作限定。而一般情况下，若需要减少小区重选的频率，优选其中的第二种方式；若需要最大可能保证终端不断网，优选其中的第三种方式。
当确定该预置时长内服务小区的信号变化趋势满足第二状态时，触发步骤308；
当确定该预置时长内服务小区的信号变化趋势不满足第二状态时，表明由该特定时刻确定的该预置时长内的服务小区的信号变化趋势不满足重选要求，还没到重选服务小区的时机，该终端可以等待下一个周期，触发步骤303。
308、终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
测到该预置时长内待选目标小区结合中邻小区的信号变化趋势后，当确定该预置时长内服务小区的信号变化趋势满足第二状态时，终端确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，该第一状态为稳定趋势和/或上升趋势；
可以理解的是，这里确定邻小区的信号变化趋势满足第一状态也有三种方式：
第一种：当确定待选目标小区集合中邻小区的信号变化趋势满足稳定趋势时，确定该邻小区的信号变化趋势满足第一状态；
可选的，在这种方式中，还可以进一步的限定，当确定待选目标小区集合中邻小区的信号变化趋势满足稳定趋势且大于第二信号强度阈值时，确定该邻小区的信号变化趋势满足第一状态；
第二种：当确定待选目标小区集合中邻小区的信号变化趋势满足上升趋势时，确定该邻小区的信号变化趋势满足第一状态；
第三种，当确定待选目标小区集合中邻小区的信号变化趋势满足上升趋势时或满足稳定趋势时，均确定该邻小区的信号变化趋势满足第一状态。
根据实际应用的需求，可以从中选取合适的方式，此处不作限定。一般情况下，为了保证目标小区信号优秀，优选第二种方式；若为了最大可能的保证终端不断网，优选其中的第三种方式。
可以理解的是，服务小区的信号变化趋势满足第二状态有三种方式，邻小区的信号变化趋势满足第一状态也有三种方式，它们之间可以根据实际需求进行任意组合以达到不同的效果，例如若为了保证目标小区信号优选，且减少小区重选的频率，可以优选服务小区的信号变化趋势满足第二状态中的第二种方式和邻小区的信号变化趋势满足第一状态中的第二种方式进行组合，根据具体 情况，为了达到其他效果，还可以进行其他的各种方式的组合，此处不作限定。
当该第二强度参数为信号强度经过运算得到的强度参数时，具体的运算方式可以有很多种，例如该第二强度参数可以由信号强度Rxlev减去小区基站的接受灵敏度RXLEV_ACCESS_MIN得到，也可以由信号强度减去小区基站的接受灵敏度与设定权值(例如50％)的积得到，根据实际应用的需求不同，还可能由信号强度与其他的小区基站的参数经过运算得到，此处不作限定。
本实施例中，优选的，该第二强度参数为信号强度。
终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，在实际应用中可以分成两个阶段来执行：
第一阶段：终端从待选目标小区集合中选取第二强度参数最大的邻小区作为第一邻小区；
第二阶段：终端判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
当确定该第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新执行该第一阶段；
当确定该第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区；
当该待选目标小区集合中所有的邻小区都不满足第一状态而被去除时，该待选目标小区成为空集，该终端可以等待下一个周期，再触发步骤303。
可以理解的是，在实际应用过程中，除了按照步骤308中确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，还可能按照其他的设定规则从待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中选取邻小区作为目标小区，例如若为了延长小区驻网时长，降低小区重选频率，可以确定待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最小的邻小区为目标小区，按照实际需求的不同，还可能有其他的选取方式，此处不作限定。
309、所述终端将服务小区重选到所述目标小区；
终端确定目标小区后，将服务小区重选到该目标小区。
310、终端采用现有迟滞判定的方式进行小区重选。
当确定该终端不处于高速运动状态时，该终端采用现有迟滞判定的方式进行小区重选。
现有迟滞判定的方式进行小区重选包括：通过迟滞信号强度(通常为3分贝毫伏dBm)和迟滞时间(通常设置为5s)两个参数来控制终端的小区重选行为：当目标小区的接收信号强度(例如-72dBm)大于服务小区的信号强度(-80dBm)加上迟滞信号强度(3dBm)，且持续时间大于迟滞时间(例如5s)后，则启动小区重选，否则继续驻留在当前的服务小区。
本发明实施例中，先判断该终端是否处于高速运动状态，只有处于高速运动状态时，才采用趋势判断方式进行小区重选，否则，采用现有迟滞判定方式进行小区重选，使得在非高速运动状态中，显著降低了小区重选的频率，而在高速运动状态中，又能避免出现短时掉网现象，加强了终端的适用性，使其在各种应用场景中能更好的达到通信质量和系统开销之间的平衡，进一步的，终端确定待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，使得目标小区的信号在满足要求的信号变化趋势的条件下最好，提高了终端的通信质量。
为便于理解，下面以一具体应用场景对本发明实施例中目标小区选择方法进行具体描述：
终端中的传感器检测到终端当前的速度值为250KM/h，大于预置速度阈值200 KM/h，该终端确定当前处于高度运动状态；
该终端按照预置时间周期1秒获取服务小区A和邻小区的信号强度，假设从时刻0秒开始获取，当前时间是第8.2秒，则终端已经获取了第0、1、2、3、4、5、6、7、8秒的服务小区和邻小区的信号强度；
该终端终端选取第8秒(特定时刻)的信号强度大于服务小区的邻小区D，E，F和G这四个邻小区，组成待选目标小区集合，其中第8秒的服务小区A的信号强度为-80dBm，邻小区D的信号强度为-60dBm，邻小区E的信号强度为-63dBm，邻小区F的信号强度为-50dBm，邻小区G的信号强度为-62dBm；
该终端检测从第3秒到第8秒内(预置时长5秒内)服务小区的信号变化 趋势，得到：第3秒服务小区A的信号强度为-45dBm，第4秒服务小区A的信号强度为-47dBm，第5秒服务小区A的信号强度为-50dBm，第6秒服务小区A的信号强度为-60dBm，第7秒服务小区A的信号强度为-70dBm，第8秒的服务小区A的信号强度为-80dBm，确定从第3秒到第8秒内服务小区的信号变化趋势为下降趋势；
该终端检测从第3秒到第8秒内该待选目标小区集合中的邻小区的信号变化趋势，得到从第3秒到第8秒内邻小区D为上升趋势，邻小区E为上升趋势，邻小区F为稳定趋势，邻小区G为下降趋势；
当终端确定从第3秒到第8秒内服务小区的信号变化趋势满足下降趋势时，该终端确定该待选目标小区集合中信号变化趋势满足上升趋势的邻小区集合(邻小区D和邻小区E)中信号强度最大的邻小区(邻小区D)为目标小区；
该终端将服务小区重选到该目标小区(邻小区D)。
下面对本发明实施例中的终端进行描述，请参阅图4，本发明实施例中终端一个实施例包括：
获取模块401，用于按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
第一确定模块402，用于确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
第一检测模块403，用于检测所述特定时刻之前的预置时长内所述第一确定模块402确定的待选目标小区集合中的邻小区的信号变化趋势；
第二确定模块404，用于确定所述待选目标小区集合中，所述第一检测模块检测403出的信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
重选模块405，用于将服务小区重选到所述第二确定模块404确定的目标小区。
本发明实施例中终端通过判断邻小区的信号变化趋势来实现服务小区的 重选。具体的，获取模块401按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，第一确定模块402选取特定时刻的第一强度参数大于服务小区的邻小区，组成待选目标小区集合，该第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数，该特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，则待选目标小区集合中的邻小区在该特定时刻的信号强度均比较好，第一检测模块403检测该特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势，第二确定模块404确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，该第一状态为稳定趋势和/或上升趋势，即目标小区的信号强度较好，且可能信号强度会不断增强，则重选模块405直接将服务小区重选到该目标小区，不再需要经过迟滞时间的判定，使得终端能够在信号快速变化的情况下及时重选到适合的目标小区，提升了网络驻留的信号质量，减少了短时掉网次数，提升了终端的呼通率。
上面实施例中，第二确定模块404确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，而此时服务小区的信号变化趋势可能是上升趋势，也可能是稳定趋势，还可能是下降趋势，在实际应用中，第二确定模块404在将待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区确定为目标小区之前，终端还可以先判断服务小区的信号变化趋势，将服务小区的信号变化趋势和邻小区的信号变化趋势同时作为参考条件来进行目标小区的选择，请参阅图5，上述的终端还包括：
第二检测模块501，用于检测所述预置时长内服务小区的信号变化趋势；
第一触发模块502，用于当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，触发所述第二确定模块404，所述第二状态为稳定趋势和/或下降趋势。
上面实施例中，将服务小区的信号变化趋势与邻小区的信号变化趋势同时作为选取目标小区的参考条件，只有当确定该预置时长内服务小区的信号变化趋势满足第二状态时，第一触发模块502才触发第二确定模块404，确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，这样服务小区的信号强度在上升时便不会进行服务小区的重选， 这样在保证了目标小区的信号强度的同时，降低了服务小区重选的频率，节省了系统资源。
在实际应用中，当第二检测模块501检测到预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，终端可以等待一个设定的时长后，再触发第一确定模块402。
可选的，如图6所示，作为本发明的终端另一个实施例，上述图5对应的实施例中的终端还可以包括：
第二触发模块601，用于当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，等待下一个预置时间周期，触发所述第一确定模块402；
上面实施例中，第一触发模块601等待下一个预置时间周期触发第一确定模块402，保证了有条件不满足时，小区重选的连续性。
在实际应用中，可能确定的待选目标小区集合为空集，出现此情况时，可以有多种处理方式，下面以其中一种为例，如图7所示，作为本发明的终端另一个实施例，上述终端还可以包括：
第一判断模块701，用于判断所述待选目标小区集合是否为空集；
第三触发模块702，用于当确定所述待选目标小区集合不为空集时，触发所述第一检测模块403；
第四触发模块703，用于当确定所述待选目标小区集合为空集时，等待下一个预置时间周期，触发所述第一确定模块402。
上面实施例中，第三触发模块702确定所述待选目标小区集合不为空集时，才触发所述第一检测模块403，否则第四触发模块等待下一个预置时间周期，触发所述第一确定模块402，保证了出现待选目标小区集合为空集时，小区重选过程的连续性。
上面实施例中，第二确定模块404确定该待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，在实际应用中，第二确定模块404可以对信号变化趋势满足第一状态的邻小区集合中的邻小区的第二强度参数进行比较，确定信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，则上述终端中的第二确定模块404具体 可以用于，确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
可以理解的是，在实际应用过程中，第二确定模块404除了确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，还可能按照其他的设定规则从待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中选取邻小区作为目标小区，例如若为了延长小区驻网时长，降低小区重选频率，第二确定模块404可以确定待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最小的邻小区为目标小区，按照实际需求的不同，还可能有其他的选取方式，此处不作限定。
上面实施例中，第二确定模块404确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，在实际应用中，其在第二确定模块404中可以由多个单元分成阶段来执行，请参与图8，作为本发明实施例中的终端另一个实施例，在图7对应实施例的终端中该第二确定模块404具体包括：
选取单元801，用于从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
判断单元802，用于判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
触发单元803，用于当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述选取单元801；
确定单元804，用于当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
上面实施例中，当该待选目标小区集合中所有的邻小区都不满足第一状态而被触发单元803去除时，该待选目标小区成为空集，该终端可以等待下一个周期，再触发第一确定模块402。
上面实施例中终端利用邻小区的信号变化趋势来进行小区重选，该方式进 行小区重选可以用于各种场景中，在实际应用中，终端可以先判断是否处于高速运动状态，只有处于高速运动状态才利用信号变化趋势来进行小区重选，请参阅图9，作为本发明实施例的终端的另一个实施例，上述终端还包括：
第二判断模块901，用于判断所述终端是否处于高速运动状态；
第五触发模块902，用于当确定所述终端处于高速运动状态时，触发所述获取模块401。
本发明实施例中，第二判断模块901先判断该终端是否处于高速运动状态，只有处于高速运动状态时，第五触发模块902才触发获取模块401，开始采用趋势判断方式进行小区重选，否则，采用现有迟滞判定方式进行小区重选，使得在非高速运动状态中，显著降低了小区重选的频率，而在高速运动状态中，又能避免出现短时掉网现象，加强了终端的适用性，使其在各种应用场景中能更好的达到通信质量和系统开销之间的平衡
上面实施例中，第二判断模块901判断终端是否处于高速运动状态，在实际应用过程中，具体判断是否为高速运动状态的方式有很多种：
可选的，第二判断模块901具体可以用于，通过传感器检测所述终端的速度值，当所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
可选的，第二判断模块901具体可以用于，检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值，当所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
为了便于理解上述实施例，下面以上述终端各个模块在一个具体应用场景中的交互过程进行说明：
第二判断模块901中的传感器检测到终端当前的速度值为250KM/h，大于预置速度阈值200KM/h，该第二判断模块901确定当前处于高度运动状态，触发获取模块401；
获取模块401按照预置时间周期1秒获取服务小区A和邻小区的信号强度，假设从时刻0秒开始获取，当前时间是第8.2秒，则获取模块401已经获取了第0、1、2、3、4、5、6、7、8秒的服务小区和邻小区的信号强度；
第一确定模块402选取第8秒(特定时刻)的信号强度大于服务小区的邻小区D，E，F和G这四个邻小区，组成待选目标小区集合，其中第8秒的服务小区A的信号强度为-80dBm，邻小区D的信号强度为-60dBm，邻小区E的信号强度为-63dBm，邻小区F的信号强度为-50dBm，邻小区G的信号强度为-62dBm；
第二检测模块501检测从第3秒到第8秒内(预置时长5秒内)服务小区的信号变化趋势，得到：第3秒服务小区A的信号强度为-45dBm，第4秒服务小区A的信号强度为-47dBm，第5秒服务小区A的信号强度为-50dBm，第6秒服务小区A的信号强度为-60dBm，第7秒服务小区A的信号强度为-70dBm，第8秒的服务小区A的信号强度为-80dBm，确定从第3秒到第8秒内服务小区的信号变化趋势为下降趋势；
第一检测模块403检测从第3秒到第8秒内该待选目标小区集合中的邻小区的信号变化趋势，得到从第3秒到第8秒内邻小区D为上升趋势，邻小区E为上升趋势，邻小区F为稳定趋势，邻小区G为下降趋势；
当第二检测模块501确定从第3秒到第8秒内服务小区的信号变化趋势满足下降趋势时，第一触发模块502触发第二确定模块404，第二确定模块404该待选目标小区集合中信号变化趋势满足上升趋势的邻小区集合(邻小区D和邻小区E)中信号强度最大的邻小区(邻小区D)为目标小区；
重选模块405将服务小区重选到该目标小区(邻小区D)。
请参阅图10，本发明实施例中的终端1000另一实施例包括：
输入装置1001、输出装置1002、处理器1003和存储器1004(其中终端1000中的处理器1003的数量可以一个或多个，图10中以一个处理器1003为例)。在本发明的一些实施例中，输入装置1001、输出装置1002、处理器1003和存储器1004可通过总线或其它方式连接，其中，图10中以通过总线连接为例。
其中，通过调用存储器1004存储的操作指令，处理器1003，用于执行如下步骤：
按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小 区；
确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
将服务小区重选到所述目标小区；
本发明的一些实施例中，所述处理器1003还执行如下步骤：
检测所述预置时长内服务小区的信号变化趋势；
本发明的一些实施例中，所述处理器1003具体执行如下步骤：
当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第二状态为稳定趋势和/或下降趋势；
本发明的一些实施例中，所述处理器1003还执行如下步骤：
当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，等待下一个预置时间周期，触发所述确定待选目标小区集合的步骤。
本发明的一些实施例中，所述处理器1003还执行如下步骤：
判断所述待选目标小区集合是否为空集；
当确定所述待选目标小区集合不为空集时，触发所述检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势的步骤；
当确定所述待选目标小区集合为空集时，等待下一个预置时间周期，触发所述确定待选目标小区集合的步骤；
本发明的一些实施例中，所述处理器1003具体执行如下步骤：
确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
本发明的一些实施例中，所述处理器1003具体执行如下步骤：
从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区的步骤；
当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区；
本发明的一些实施例中，所述处理器1003还执行如下步骤：
判断所述终端是否处于高速运动状态；
当确定所述终端处于高速运动状态时，触发所述按照预置时间周期获取服务小区的信号强度和邻小区的信号强度的步骤；
本发明的一些实施例中，所述处理器1003具体执行如下步骤：
通过传感器检测所述终端的速度值；
当确定所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态；
本发明的一些实施例中，所述处理器1003具体执行如下步骤：
检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值；
当确定所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，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存在，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，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品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全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (27)

  1. 一种目标小区选择方法，其特征在于，包括：
    终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
    所述终端确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
    所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
    所述终端确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
    所述终端将服务小区重选到所述目标小区。
  2. 根据权利要求1所述的方法，其特征在于，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区的步骤之前还包括：
    所述终端检测所述预置时长内服务小区的信号变化趋势；
    所述终端确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区包括：
    当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第二状态为稳定趋势和/或下降趋势。
  3. 根据权利要求2所述的方法，其特征在于，所述终端检测所述预置时长内服务小区的信号变化趋势的步骤之后还包括：
    当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，所述终端等待下一个预置时间周期，触发所述终端确定待选目标小区集合的步骤。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述终端选取特定时刻的第一强度参数大于服务小区的邻小区，组成待选目标小区集合的步骤之后还包括：
    所述终端判断所述待选目标小区集合是否为空集；
    当确定所述待选目标小区集合不为空集时，触发所述终端检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势的步骤；
    当确定所述待选目标小区集合为空集时，所述终端等待下一个预置时间周期，触发所述终端确定待选目标小区集合的步骤。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区具体包括：
    所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
  6. 根据权利要求5所述的方法，其特征在于，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区包括：
    所述终端从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
    所述终端判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
    当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述终端从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区的步骤；
    当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度的步骤之前还包括：
    所述终端判断所述终端是否处于高速运动状态；
    当确定所述终端处于高速运动状态时，触发所述终端按照预置时间周期获取服务小区的信号强度和邻小区的信号强度的步骤。
  8. 根据权利要求7所述的方法，其特征在于，所述终端判断所述终端是否处于高速运动状态包括：
    所述终端通过传感器检测所述终端的速度值；
    当所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
  9. 根据权利要求7所述的方法，其特征在于，所述终端判断自身是否处于高速运动状态包括：
    所述终端检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值；
    当所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
  10. 一种终端，其特征在于，包括：
    获取模块，用于按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
    第一确定模块，用于确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
    第一检测模块，用于检测所述特定时刻之前的预置时长内所述第一确定模块确定的待选目标小区集合中的邻小区的信号变化趋势；
    第二确定模块，用于确定所述待选目标小区集合中，所述第一检测模块检测出的信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
    重选模块，用于将服务小区重选到所述第二确定模块确定的目标小区。
  11. 根据权利要求10所述的终端，其特征在于，所述终端还包括：
    第二检测模块，用于检测所述预置时长内服务小区的信号变化趋势；
    第一触发模块，用于当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，触发所述第二确定模块，所述第二状态为稳定趋势和/或下降趋势。
  12. 根据权利要求11所述的终端，其特征在于，所述终端还包括：
    第二触发模块，用于当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，等待下一个预置时间周期，触发所述第一确定模块。
  13. 根据权利要求10至12中任一项所述的终端，其特征在于，所述终端还包括：
    第一判断模块，用于判断所述待选目标小区集合是否为空集；
    第三触发模块，用于当确定所述待选目标小区集合不为空集时，触发所述第一检测模块；
    第四触发模块，用于当确定所述待选目标小区集合为空集时，等待下一个预置时间周期，触发所述第一确定模块。
  14. 根据权利要求10至13中任一项所述的终端，其特征在于，所述第二确定模块具体用于，确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
  15. 根据权利要求14所述的终端，其特征在于，所述第二确定模块具体包括：
    选取单元，用于从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
    判断单元，用于判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
    触发单元，用于当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述选取单元；
    确定单元，用于当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
  16. 根据权利要求10至15中任一项所述的终端，其特征在于，所述终端还包括：
    第二判断模块，用于判断所述终端是否处于高速运动状态；
    第五触发模块，用于当确定所述终端处于高速运动状态时，触发所述获取模块。
  17. 根据权利要求16所述的终端，其特征在于，所述第二判断模块具体用于，通过传感器检测所述终端的速度值，当所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
  18. 根据权利要求16所述的终端，其特征在于，所述第二判断模块具体用于，检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值，当所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
  19. 一种终端，其特征在于，包括：
    输入装置、输出装置、处理器和存储器；
    通过调用所述存储器存储的操作指令，所述处理器用于执行如下步骤：
    按照预置时间周期获取服务小区的信号强度和邻小区的信号强度，所述服务小区为所述终端当前驻留的小区，所述邻小区为所述终端能接收到信号的小区；
    确定待选目标小区集合，所述待选目标小区集合中包括在特定时刻第一强度参数大于服务小区的邻小区，其中，所述特定时刻为最近获取到服务小区的信号强度和邻小区的信号强度的时刻，所述第一强度参数为信号强度，或为由信号强度经过运算得到的强度参数；
    检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势；
    确定所述待选目标小区集合中，信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第一状态为稳定趋势和/或上升趋势；
    将服务小区重选到所述目标小区。
  20. 根据权利要求19所述的终端，其特征在于，所述处理器还执行如下步骤：
    检测所述预置时长内服务小区的信号变化趋势；
    所述处理器具体执行如下步骤：
    当确定所述预置时长内所述服务小区的信号变化趋势满足第二状态时，所述终端确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中的一个邻小区为目标小区，所述第二状态为稳定趋势和/或下降趋势。
  21. 根据权利要求20所述的终端，其特征在于，所述处理器还执行如下步骤：
    当确定所述预置时长内所述服务小区的信号变化趋势不满足所述第二状态时，等待下一个预置时间周期，触发所述确定待选目标小区集合的步骤。
  22. 根据权利要求19至21中任一项所述的终端，其特征在于，所述处理器还执行如下步骤：
    判断所述待选目标小区集合是否为空集；
    当确定所述待选目标小区集合不为空集时，触发所述检测所述特定时刻之前的预置时长内待选目标小区集合中的邻小区的信号变化趋势的步骤；
    当确定所述待选目标小区集合为空集时，等待下一个预置时间周期，触发所述确定待选目标小区集合的步骤。
  23. 根据权利要求19至22中任一项所述的终端，其特征在于，所述处理器具体执行如下步骤：
    确定所述待选目标小区集合中信号变化趋势满足第一状态的邻小区集合中第二强度参数最大的邻小区为目标小区，所述第二强度参数为信号强度，或为由信号强度经过运算得到的强度参数。
  24. 根据权利要求23所述的终端，其特征在于，所述处理器具体执行如下步骤：
    从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区；
    判断所述第一邻小区的信号变化趋势是否满足所述第一状态；
    当确定所述第一邻小区的信号变化趋势不满足所述第一状态时，将所述第一邻小区从所述待选目标小区集合中去除，更新所述待选目标小区集合，重新触发所述从所述待选目标小区集合中选取信号强度最大的邻小区作为第一邻小区的步骤；
    当确定所述第一邻小区满足所述第一状态时，确定所述第一邻小区为所述目标小区。
  25. 根据权利要求19至24中任一项所述的终端，其特征在于，所述处理器还执行如下步骤：
    判断所述终端是否处于高速运动状态；
    当确定所述终端处于高速运动状态时，触发所述按照预置时间周期获取服务小区的信号强度和邻小区的信号强度的步骤。
  26. 根据权利要求25所述的终端，其特征在于，所述处理器具体执行如下步骤：
    通过传感器检测所述终端的速度值；
    当确定所述终端的速度值大于预置速度阈值时，确定所述终端处于所述高速运动状态。
  27. 根据权利要求25所述的终端，其特征在于，所述处理器具体执行如下步骤：
    检测所述终端的自动频率控制在预设时长内的偏移值是否大于预置偏移值；
    当确定所述终端的自动频率控制在预设时长内的偏移值大于所述预置偏移值时，确定所述终端处于所述高速运动状态。
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