WO2015176374A1 - 一种终端小区重选方法及装置 - Google Patents

一种终端小区重选方法及装置 Download PDF

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Publication number
WO2015176374A1
WO2015176374A1 PCT/CN2014/082427 CN2014082427W WO2015176374A1 WO 2015176374 A1 WO2015176374 A1 WO 2015176374A1 CN 2014082427 W CN2014082427 W CN 2014082427W WO 2015176374 A1 WO2015176374 A1 WO 2015176374A1
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Prior art keywords
cell
neighboring
reselection
terminal
list
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PCT/CN2014/082427
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English (en)
French (fr)
Inventor
杨祥陵
屠丁元
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中兴通讯股份有限公司
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Priority to US15/313,092 priority Critical patent/US20170150410A1/en
Publication of WO2015176374A1 publication Critical patent/WO2015176374A1/zh

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    • 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
    • H04W36/0005—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
    • H04W36/0005—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
    • 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
    • H04W36/0085—Hand-off measurements
    • 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
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • 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

Definitions

  • the present invention relates to the field of wireless communication technologies, and is an improvement on an existing cell reselection mechanism on a terminal device.
  • BACKGROUND OF THE INVENTION Cell reselection refers to a process in which a UE selects a best cell to provide a service signal by monitoring signal quality of a neighboring cell and a current cell in an idle mode.
  • the existing cell reselection mechanism is as follows:
  • Standard for LTE cell selection In the cell reselection process, the UE needs to measure the cell to be selected in order to perform channel quality assessment and determine whether it meets the resident standard.
  • the criteria for cell selection is called the S criterion.
  • the channel quality of a cell satisfies the S criterion, it can be selected as the camping cell.
  • the specific content of the S criterion is as follows, and the meaning of each parameter is shown in Figure 1:
  • the UE When performing cell selection, the UE obtains the RSRP value of the cell by measuring Qrxlevmeas, obtains other parameters in the S criterion formula through the system information of the cell and its own capability level, and calculates Srxlev, and then compares it with 0. If Srxlev > 0, the UE considers that the cell satisfies the channel quality requirement of the cell selection, and may select it as the camping cell. If the cell's system information indicates that it is allowed to camp, the UE will choose to camp on this cell and enter the idle state.
  • the LTE cell reselection cell reselection timing 1) starting the cell reselection after camping on the appropriate cell; 2) moving the UE in the RRCJDLE state.
  • the principle of cell reselection 1) The UE enables the cell reselection process by measuring the attributes of the serving cell and the neighboring cell; 2) the system information of the serving cell indicates that the UE searches for and measures the information of the neighboring cell; 3) the cell reselection criterion involves Service Measurement of the cell and the neighboring cell; 4)
  • the cell reselection parameter can be applied to all UEs in the cell, but it is possible to configure a specific reselection parameter for a certain UE or UE group.
  • Cell reselection process 1) UE evaluates all RAT frequencies based on priority; 2) UE compares cells on all relevant frequencies based on radio link quality; 3) Reselects target cell, UE verifies Accessibility of the cell; 4) No access restricted, reselected to the target cell.
  • Cell reselection priority considerations The absolute priority of eUTRAN for different frequencies or IRAT frequencies is:
  • Cell reselection can be divided into co-frequency cell reselection and inter-frequency cell reselection.
  • the same frequency cell reselection can solve the wireless coverage problem; the inter-frequency cell reselection can not only solve the wireless coverage problem, but also achieve the load balancing by setting the priorities of different frequency points.
  • the same frequency cell reselection and inter-frequency cell reselection processes are shown in FIG. 3 and FIG. 4, respectively.
  • Co-frequency cell reselection measurement criteria In order to maximize UE battery life, the UE does not need to perform frequent neighbor cell monitoring (measurement) at all times unless the serving cell quality falls below a prescribed threshold. 8 ⁇ is used to determine whether to perform threshold parameters for co-frequency cell reselection when performing co-frequency cell reselection. When the S value of the LTE serving cell is less than or equal to S mtrasearch , the intra- frequency cell reselection measurement is performed; if the 8 ⁇ parameter is not broadcast in the system message, the intra-frequency cell reselection measurement is also performed. In addition to this, the UE may choose not to perform measurements. Cell ranking: The candidate cells are sorted according to the channel quality, and the optimal cell is selected. The meaning of the same-frequency cell reselection parameter is shown in Figure 2.
  • Cell reselection criterion The object of the same frequency cell reselection may be the cell in the neighbor cell list, or may be through the reselection process. The detected cell. The queuing and selection process needs to meet the following constraints. 1) The channel quality of the new target cell is better than the current serving cell quality in the order of duration T duratl . n is not shorter than T resd ⁇ tl . nRAT;
  • the eNodeB can implement load balancing of different frequency point cells by setting different priority parameters for each frequency point.
  • the inter-frequency cell reselection mainly includes the following steps.
  • Measurement criteria For frequencies whose priority indicated by the system information is higher than the current frequency priority, the UE always performs measurements on these high priority frequencies; for frequencies whose priority indicated by the system information is equal to or lower than the current frequency priority, The measurement criteria of the UE are as follows. 1) If the S value of the serving cell is greater than the threshold S nonintrasearch, no measurement is performed; 2) If the S value of the serving cell is less than or equal to the threshold S nonintrasearch, the measurement is performed. Priority processing: The UE may obtain the priority information (common priority) of the frequency point through the broadcast message, or acquire the priority information (common priority) of the frequency point through the RRC connection release message. If a dedicated priority is provided, the UE will ignore all public priorities.
  • the UE sets the frequency priority of the cell to be the lowest.
  • the UE performs cell reselection according to the priority policy only between the frequency points appearing in the system information and providing the priority.
  • Cell reselection criteria For cell reselection of high priority frequency points, the following conditions are met. 1) High priority frequency cell Squal > ThreshX, HighQ and duration exceeds TreselectionRAT; 2) High priority frequency cell Srxlev > ThreshX, HighP and duration exceeds TreselectionRAT; UE camped original cell time exceeds ls. If multiple neighboring cells on the highest priority meet the criteria, the best cell on the highest priority frequency is selected.
  • the R criterion of co-frequency cell reselection is adopted.
  • Cell reselection for low priority frequencies is performed after the following conditions are met. 1) Cells without high priority frequencies meet reselection requirements; 2) Cells without equal priority frequencies meet reselection requirements; 3) Squal ⁇ ThreshServing, LowQ of the serving cell; 4) Squal>Thresh X, LowQ of the target cell And the duration exceeds the Treselection RAT; 5) Srxlev ⁇ ThreshServing, LowP of the serving cell; 6) S Srxlev>ThreshX of the target cell, LowP and duration exceeds TreselectionRAT; 7) The UE camps on the original cell for more than ls.
  • the object of the inter-frequency cell reselection may be a cell in the neighbor cell list, or may be a cell detected in the cell reselection process. If the detection of the UE rate indicates that the cell is in a non-ordinary (medium or high speed) mobile state, the scaled parameter TreselectionRAT should be used during the reselection.
  • the scaled parameter TreselectionRAT should be used during the reselection.
  • up to 45 neighboring cells can be defined for one cell in the database of the system, only 20 of the system transmit LUM messages to the mobile phone via the air interface, and these 20 are systems according to certain algorithms.
  • the system Selected from the list of multiple neighboring cell databases of the current serving cell, the system generally depends on the signal strength and quality of the cells in the selection process, and selects according to a preset algorithm according to the static definition of the database.
  • a neighboring cell B is not statically defined in the neighbor cell list of the system, or if it is declared, but the priority is too low to be selected by the selection algorithm, it cannot be broadcast to the mobile phone through the air interface through the LUM.
  • the terminal periodically measures the neighboring cell according to the neighbor cell information in the network side system message.
  • the terminal reselects from the current serving cell.
  • the terminal only measures the cells existing in the neighbor cell list, and finds that it stays in the original serving cell when it does not meet the cell reselection conditions specified by the network side.
  • the terminal is in a serving cell with a weak signal for a long time, and cannot receive paging messages normally, and the performance of the data service is degraded.
  • An object of the present invention is to provide a method and a device for reselecting a terminal cell, which can better solve the problem that the neighboring cell is mismatched or unreasonably arranged in the weak signal region, and the terminal is in a weak signal in the serving cell for a long time.
  • the problem of receiving paging messages normally and degrading data service performance.
  • a terminal cell reselection method including: when a terminal performs cell reselection according to a signal quality or service performance of a serving cell, obtaining a first neighbor cell list from the system side; The neighboring cell that meets the cell reselection condition is selected in the first neighboring cell list; if the neighboring cell in the first neighboring cell list does not satisfy the cell reselection condition, the terminal performs an active search, and the cell weight is satisfied. Other neighboring cells of the condition are selected and camped on the other neighboring cells satisfying the cell reselection condition.
  • the terminal when the service performance of the terminal decreases and the duration of the service performance decreases is greater than the preset fall time, the terminal performs cell reselection.
  • the terminal performs an active search to obtain other neighboring cells that meet the cell reselection condition, and the camping to the cell includes: the terminal obtains the supported first neighbor by the active search.
  • the neighboring cells other than the neighboring cells in the cell list form a second neighboring cell list; determining the priority of each neighboring cell by performing cell measurement on each neighboring cell in the second neighboring cell list respectively And selecting a neighboring cell with the highest priority, and determining whether the neighboring cell with the highest priority meets the cell reselection condition; if the neighboring cell with the highest priority satisfies the cell reselection condition, camping on the The neighbor cell with the highest priority.
  • the step of forming the second neighboring cell list comprises: the terminal actively searching for the frequency points and network systems supported by the terminal, and obtaining all neighboring cells of the serving cell; deleting all the neighboring cells in the obtained neighboring cell
  • the neighboring cells in the first neighboring cell list obtain a second neighboring cell list formed by the remaining neighboring cells.
  • the step of determining a priority of each neighboring cell by performing cell measurement on each neighboring cell in the second neighboring cell list includes: by using, in the second neighboring cell list Each neighboring cell performs cell measurement separately, and obtains signal strength and quality of each neighboring cell; using the signal strength and quality of each neighboring cell, respectively obtaining priority of each neighboring cell, and is high according to priority Arrange in a low order.
  • the step of determining whether the neighbor cell with the highest priority meets the cell reselection condition comprises: when the neighbor cell with the highest priority meets the S standard, and the priority is higher than the serving cell When the duration of the priority is greater than the preset reselection time, it is determined whether the neighbor cell with the highest priority satisfies the cell reselection condition.
  • the method further includes: the terminal monitoring the signal quality of the original serving cell; if the signal quality of the original serving cell is better than the current camping cell When the duration is greater than the preset reselection time, the terminal re-residents to the original serving cell.
  • a terminal cell reselection apparatus including: an obtaining module, configured to acquire a first neighbor from a system side when performing cell reselection according to a signal quality or service performance of a serving cell a cell, a selection module, configured to select a neighboring cell that satisfies a cell reselection condition from the first neighbor cell list; and a reselection module, if the neighbor cells in the first neighbor cell list are not satisfied After the cell reselection condition, the terminal performs an active search to obtain other neighboring cells that satisfy the cell reselection condition, and camps on the other neighboring cells that satisfy the cell reselection condition.
  • the terminal when the service performance of the terminal decreases and the duration of the service performance decreases is greater than the preset fall time, the terminal performs cell reselection.
  • the reselection module is further configured to re-resident to the original serving cell when it is detected that the signal quality of the original serving cell is better than the duration of the current camping cell is greater than the preset reselection time.
  • FIG. 1 is a diagram showing the meaning of an LTE cell selection parameter provided by the prior art
  • 2 is a diagram of the meaning of the same-frequency cell reselection parameter provided by the prior art
  • FIG. 3 is a flowchart of the same-frequency cell reselection provided by the prior art
  • FIG. 4 is a flow chart of the inter-frequency cell reselection provided by the prior art
  • 5 is a block diagram of a terminal cell reselection method provided by the present invention
  • FIG. 6 is a block diagram of a terminal cell reselection apparatus provided by the present invention
  • Step S101 When a terminal performs cell reselection according to a signal quality or service performance of a serving cell, the system obtains the first List of neighboring cells.
  • the terminal when the signal quality Ss of the current serving cell is not greater than the intra-frequency cell reselection threshold Sintmsearch, the terminal performs neighbor cell measurement to determine whether to perform reselection.
  • the terminal when the service performance of the terminal decreases and the duration of the service performance decline is greater than the preset fall time, the terminal performs cell reselection.
  • the neighboring cell in the first neighboring cell list is a part of all the neighboring cells of the current serving cell of the terminal, and is obtained from a system message sent by the system side.
  • Step S102 Select a neighboring cell that satisfies the cell reselection condition from the first neighbor cell list.
  • the terminal performs cell measurement on each neighboring cell in the first neighboring cell list, calculates the rank value of each neighboring cell, and arranges the rank values in descending order according to the rank value. If the signal quality St of a neighboring cell satisfies the S criterion, and the priority of the priority of the current serving cell is greater than the preset reselection time, determining that the neighboring cell is a neighboring cell that satisfies the cell reselection condition, Otherwise, the neighboring cell is determined to be a neighboring cell that does not satisfy the cell reselection condition.
  • Step S103 If the neighboring cells in the first neighboring cell list do not satisfy the cell reselection condition, the terminal performs an active search to obtain other neighboring cells that meet the cell reselection condition, and camps to meet the cell reselection condition.
  • Other neighboring cells The terminal actively searches for the supported frequency points and the network standard, obtains all neighboring cells of the serving cell, deletes the neighboring cells in the first neighboring cell list in all the obtained neighboring cells, and obtains the remaining neighboring cells.
  • a list of second neighboring cells Cell measurement is performed on each neighboring cell in the second neighboring cell list to obtain signal strength and quality of each neighboring cell; and the priority of each neighboring cell is obtained by using the signal strength and quality of each neighboring cell.
  • the terminal After camping on the neighboring cell that meets the cell reselection condition, the terminal monitors the signal quality of the original serving cell, if the signal quality of the original serving cell is better than the duration of the current camping cell is greater than the preset reselection time.
  • the first neighboring cell list is obtained from the system side, and the selecting module 22 selects the neighboring cell that satisfies the cell reselection condition from the first neighboring cell list, if the first If the neighboring cells in the neighboring cell list do not satisfy the cell reselection condition, the reselection module 23 performs an active search to obtain other neighboring cells that satisfy the cell reselection condition, and camps on other phases that satisfy the cell reselection condition. Neighboring cell.
  • the reselection module 23 is further configured to re-resident to the original serving cell when it is monitored that the signal quality of the original serving cell is better than the duration of the current camping cell is greater than the preset reselection time.
  • the present invention also increases the user experience judgment condition given by the terminal side, so as to dynamically improve the threshold value of the neighbor cell measurement, and find that the terminal user experience is worse than the threshold value. And when the cells in the neighbor cell list do not meet the reselection condition, actively search for the frequency points except the neighboring cell in the supported frequency band, and search for the cells according to the PLMN, the LAC, the RAT, and the previously camped cells.
  • the frequency point and the network system are sequentially scanned, and the weighted values are assigned according to the signal strength and quality, and then the appropriate target cell is selected for registration. Finally, a periodic timer is given, and after the timeout, the previous serving cell is actively measured again. Exit the weak signal zone, and if yes, return to the original serving cell.
  • the innovations of the invention include the following: 1. Judgment conditions for poor user experience given by the terminal side: Voice and data service performance degradation duration T duratl . N2 is greater than the specified value (can be set by the user, recommended 20 ⁇ 60s), and is considered to be in the weak signal service area at this time;
  • FIG. 7 is a flowchart of reselection of a same-frequency cell of a terminal according to an embodiment of the present invention. As shown in FIG. 7, the following reference numerals [1010] to [1070] are existing co-frequency cell reselection procedures, and the rest are added by the embodiment of the present invention. Process. [1010]
  • the cell reselection process can be performed.
  • cell reselection it is possible to ensure that the UE in idle mode resides in a suitable cell to the greatest extent.
  • cell reselection is triggered by monitoring the measurement values of the serving cell Cs and the neighboring cell Cn.
  • the core content of the reselection trigger condition is: There are better cells than the serving cell, and better cells remain best for a period of time. In this way, on the one hand, the UE tries to re-select to a better cell, and on the other hand, it ensures a certain stability and avoids frequent reselection shocks.
  • the cell reselection in LTE is divided into two types: intra-frequency cell reselection and inter-frequency cell reselection (including cell reselection between different RATs).
  • the parameters related to cell reselection are derived from the system messages SIB3, SIB4 and sm5 of the serving cell.
  • SIB3 contains information about cell co-frequency and inter-frequency (including Inter-RAT) reselection.
  • intra-frequency cell reselectionInfo parameters related to co-frequency cell reselection are defined.
  • Sintrasearch is used to determine whether to perform threshold parameters for co-frequency cell reselection when performing co-frequency cell reselection.
  • the intra-frequency cell reselection measurement is performed; and if the Sintrasearch parameter is not broadcast in the system message, the intra-frequency cell reselection measurement is also performed. In addition to this, the UE may choose not to perform measurements.
  • the UE obtains the neighbor cell list Cn from the system message broadcasted by the current serving cell Cs, performs cell measurement on the target cell Ct, calculates the rank value, and sorts from large to small.
  • t-Reselection defines the time interval for cell selection.
  • some cell reselection parameters related to mobility are also defined in intraFreqCell-ReselectionInfo.
  • SIB4 includes cell related information related to co-frequency cell reselection, and a cell physical ID list for co-frequency reselection and a corresponding offset value are defined in intraFreqNeighborCellInfo.
  • the offset value is used to perform the formula for the cell reselection sorting R criterion (described below) in order to reduce the reselection oscillation.
  • R criterion A cell blacklist that cannot be used for intra-frequency reselection is also defined in SIB4.
  • SIB4 For cells of the same frequency, or cells with different frequencies but with the same priority, the UE uses the R criterion to reselect the cells.
  • the so-called R criterion means that the Rs of the serving cell and the Rt of the target cell respectively satisfy:
  • the UE will reselect this autonomously.
  • the strongest and best target cell Ct if all the cells in the cell list Ca do not satisfy the condition of [1160], it indicates that all the neighboring cells do not satisfy the reselection condition, and the UE can only continue to camp on the original serving cell Cs.
  • FIG. 8 is a flowchart of terminal inter-frequency cell reselection according to an embodiment of the present invention. As shown in FIG. 8, the following numbers [1010] to [1070] are existing inter-frequency cell reselection procedures, and the rest are added procedures of the present invention. .
  • the eNodeB can implement load balancing of cells of different frequency points by setting different priority parameters for each frequency point. After LTE camps on the appropriate cell and stays in the appropriate time (1 second), the cell reselection process can be performed.
  • nRAT Radio Access
  • the UE camps on the original cell for more than ls. If multiple neighboring cells on the highest priority meet the criteria, the best cell on the highest priority frequency is selected. [1020, 1030, 1040]
  • the measurement criteria of the UE are as follows:
  • the UE stays in the original cell for more than ls.
  • the S value SS of the LTE serving cell is greater than the S nonlntrase arch. If yes, the performance of the voice or data service is degraded in the non-IDLE state before the IDLE, the duration T Duratl0 criz2> User-specified weak signal timeout optimization time T US (recommended 20s ⁇ 60s), then save the current Ss value in the variable Ssl and start cell measurement. If the above two conditions are different, then stay at For the current service area, no measurement is performed.
  • the R criterion of the same-frequency cell reselection is adopted.
  • Rt Qmeas, t - Qoffset
  • Qmeas is the RSRP value of the measurement cell
  • Qoffset defines the offset value of the target cell, and for the inter-frequency cell with the same priority, including the cell-based offset value and the frequency-based
  • the offset value is two parts. If the target cell is in T resd ⁇ tl . n time (the same frequency and different frequency T resd ⁇ tl . n may be different, so in Figure 8, with T resd ⁇ tl . nRAT to indicate) Satisfy the S standard, Rt continues to exceed Rs, then the UE will re-select Target cell.
  • the UE reselects the target cell Ct that is not in the neighbor cell list Cn given in the system broadcast message, which is only a non-standard process on the mobile phone side. Therefore, after the signal strength and quality of the original serving cell are restored, the UE should still be reselected first.
  • the cell Cs in the neighbor cell list Cn At this time, if the signal quality of both Ct and Cs deteriorates, it must be reselected in Cn.

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Abstract

本发明公开了一种终端小区重选的方法及装置，涉及无线通讯技术领域，该方法包括以下步骤：当终端根据服务小区的信号质量或业务性能进行小区重选时，从系统侧获取第一相邻小区列表；从第一相邻小区列表中选取满足小区重选条件的相邻小区；若第一相邻小区列表中的相邻小区均不满足小区重选条件，则终端进行主动搜索，得到满足小区重选条件的其它相邻小区，并驻留到其它相邻小区。本发明能够使终端在弱信号下，主动搜索周围存在的最优小区并驻留，有利于提升无线性能，改善用户体验。

Description

一种终端小区重选方法及装置 技术领域 本发明涉及无线通讯技术领域， 是在终端设备上， 对现有小区重选机制的改进。 背景技术 小区重选 （cell reselection) 指 UE在空闲模式下通过监测邻区和当前小区的信号 质量以选择一个最好的小区提供服务信号的过程。 以 LTE为例， 现有小区重选机制如 下：
1. LTE小区选择的标准 小区重选过程中， UE需要对将要选择的小区进行测量， 以便进行信道质量评估， 判断其是否符合驻留的标准。 小区选择的标准被称为 S准则。 当某个小区的信道质量 满足 S准则时， 就可以被选择为驻留小区。 S准则的具体内容如下， 其各参数的含义 见图表 1 :
Srxlev>0 and Squal>0
Srxlev=Qrxlevmeas-(Qrxlevmin+QrxlevminofFset)-Pcompensation Squal=Qqualmeas-(Qqualmin + Qqualminoffset)
UE在进行小区选择时， 通过测量 Qrxlevmeas 得到小区的 RSRP值， 通过小区的 系统信息及自身能力等级获取 S准则公式中的其他参数， 计算得到 Srxlev, 然后与 0 进行比较。 如果 Srxlev>0， 则 UE认为该小区满足小区选择的信道质量要求， 可以选 择其作为驻留小区。 如果该小区的系统信息中指示其允许驻留， 那么 UE将选择在此 小区上驻留， 进入空闲状态。
2. LTE小区重选 小区重选时机： 1 ) 开机驻留到合适小区即开始小区重选； 2)处于 RRCJDLE状 态下 UE移动。 小区重选的原则： 1 ) UE通过测量服务小区和邻小区的属性来使能小区重选过程; 2) 服务小区的系统信息指示 UE搜索和测量邻小区的信息； 3 ) 小区重选准则涉及服 务小区和邻小区的测量； 4) 小区重选参数可以适用于小区中的所有 UE， 但有可能对 某个 UE或 UE组配置特定的重选参数。 小区重选过程： 1 ) UE评估基于优先级的所有 RAT频率； 2) UE用排序的准则并 基于无线链路质量来比较所有相关频率上的小区； 3 ) —旦重选目标小区， UE验证该 小区的可接入性； 4) 无接入受限， 重选到目标小区。 小区重选优先级考虑： eUTRAN不同频率或 IRAT频率的绝对优先级获取途径为：
1 ) 系统信息； 2) RRCConnectionRelease消息。 当 UE处于空闲状态， 在小区选择之后它需要持续地进行小区重选， 以便驻留在 优先级更高或者信道质量更好的小区。 网络通过设置不同频点的优先级， 可以达到控 制 UE驻留的目的； 同时， UE在某个频点上将选择信道质量最好的小区， 以便提供更 好的服务。 小区重选可以分为同频小区重选和异频小区重选。 同频小区重选， 可以解决无线 覆盖问题； 异频小区重选， 不仅可以解决无线覆盖问题， 而且还可以通过设定不同频 点的优先级来实现负载均衡。 其中， 同频小区重选和异频小区重选流程分别如图 3和 图 4所示。
(1)同频小区重选 测量准则： 为了最大化 UE电池寿命， UE不需要在所有时刻都进行频繁的邻小区 监测 （测量）， 除非服务小区质量下降为低于规定的门限值。 8^^^用于进行同频小 区重选时， 判断是否进行同频小区重选的门限参数。 当 LTE服务小区的 S值小于等于 Smtrasearch时，就要执行同频小区重选测量； 另外如果此 8^^^参数没有在系统消息内 广播， 也要执行同频小区重选测量。 除此之外， UE可以选择不进行测量。 小区排序： 对候选小区根据信道质量高低进行 R准则排序， 选择最优小区，其中， 同频小区重选参数含义见图表 2。
R准则： 服务小区 Rs=Qmeas,s+QHyst; 邻小区 Rn=Qmeas,n - Qoffset 小区重选准则： 同频小区重选的对象可以是邻小区列表中的小区， 也可以是通过 重选过程中检测到的小区。排队及选择过程需要满足如下的约束条件。 1 )新目标小区 的信道质量在排序中要比当前服务小区质量好的持续时间 Tduratl。n不短于 Tresd∞tl。nRAT;
2) 如果 UE处于非普通移动状态 （中速或高速）， 则需要考虑对参数 TreselectionRAT 与 Qhyst进行缩放； 3 ) UE驻留原小区时间超过 ls。 (2) 异频小区重选 在异频小区重选过程中， eNodeB可以通过对各频点设置不同的优先级参数来实现 不同频点小区的负载均衡。 异频小区重选主要包括以下几个步骤。 测量准则：对于系统信息指出的优先级高于当前频率优先级的频率， UE总是执行 对这些高优先级频率的测量； 对于系统信息指出的优先级等于或低于当前频率优先级 的频率， UE的测量准则如下。 1 ) 如果服务小区的 S值大于门限值 S nonintrasearch ， 不执行测量； 2)如果服务小区的 S值小于或等于门限值 S nonintrasearch ， 执行测量。 优先级处理： UE可以通过广播消息获取频点的优先级信息 （公共优先级）， 或者 通过 RRC连接释放消息获取频点的优先级信息 （公共优先级）。 如果提供了专用优先 级， UE将忽略所有的公共优先级。如果系统信息中没有提供 UE当前驻留小区的优先 级信息， UE将把该小区所在的频点优先级设置为最低。 UE只在系统信息中出现的并 提供了优先级的频点之间， 按照优先级策略进行小区重选。 小区重选准则： 对于高优先级频点的小区重选， 在满足以下条件后进行。 1 )高优 先级频率小区 Squal > ThreshX, HighQ 且持续时间超过 TreselectionRAT; 2)高优先级 频率小区 Srxlev > ThreshX, HighP且持续时间超过 TreselectionRAT; UE驻留原小区时 间超过 ls。 如果最高优先级上多个相邻小区符合标准，则选择最高优先级频率上的最优小区。 对于同等优先级频点 /同频， 采用同频小区重选的 R准则。 对于低优先级频率的小区重选， 在满足以下条件后进行。 1 )没有高优先级频率的 小区符合重选要求； 2 ) 没有同等优先级频率的小区符合重选要求； 3 ) 服务小区的 Squal<ThreshServing,LowQ； 4) 目标小区的 Squal>Thresh X,LowQ 且持续时间超过 TreselectionRAT； 5 ) 服务小区的 Srxlev<ThreshServing,LowP； 6 ) 目标小区的 S Srxlev>ThreshX,LowP且持续时间超过 TreselectionRAT; 7) UE驻留原小区时间超过 ls。 异频小区重选的对象可以是邻小区列表中的小区， 也可以是小区重选过程中检测 到的小区。 如果对 UE速率的检测结果表明该小区处于非普通（中速或高速）移动状 态， 在重选过程中应该使用经过缩放的参数 TreselectionRAT。 目前， 虽然在系统的数据库中可以为一个小区定义多达 45个相邻小区，但系统通 过 LUM消息经空中接口向手机传送的只有 20个，而这 20个是系统按照一定的算法 从当前服务小区的多个相邻小区数据库列表中选出来的， 在选择的过程中系统一般依 赖于这些小区的信号强度和质量， 同时根据数据库的静态定义按照预先设定的算法进 行选择。 这样如果某个相邻小区 B在系统的邻小区列表中没有静态定义， 或者虽然宣 言了但由于优先级太低而不能被选择算法选中，也就不能通过 LUM经空中接口广播 给手机， 手机的邻小区寄存器中也就没有该小区的信息。 于是就有可能有信号强度和 质量很好的小区不存在于邻区列表中， 即发生邻小区漏配。 其次， 终端在空闲态下， 会根据网络侧系统消息里的邻小区信息对邻小区周期性 地进行测量， 当小区信号质量满足网络侧规定的小区重选条件后,会从当前服务小区重 选到更佳的新小区中。 这种方式下终端只会测量邻小区列表中存在的小区， 并且发现 不满足网络侧规定的小区重选条件时会一直停留在原服务小区。 导致终端长期处于弱 信号的服务小区内， 无法正常接收寻呼消息， 数据业务性能下降等问题。 发明内容 本发明的目的在于提供一种终端小区重选方法及装置，能更好地解决弱信号区内， 邻小区漏配或者设置不合理， 导致终端长期处于弱信号的服务小区内， 从而无法正常 接收寻呼消息， 数据业务性能下降等问题。 根据本发明的一个方面， 提供了一种终端小区重选方法， 包括： 当终端根据服务 小区的信号质量或业务性能进行小区重选时， 从系统侧获取第一相邻小区列表； 从所 述第一相邻小区列表中选取满足小区重选条件的相邻小区； 若所述第一相邻小区列表 中的相邻小区均不满足小区重选条件， 则终端进行主动搜索， 得到满足小区重选条件 的其它相邻小区， 并驻留到所述满足小区重选条件的其它相邻小区。 优选地，当终端的业务性能下降且业务性能下降的持续时间大于预设下降时间时， 终端进行小区重选。 优选地， 所述的终端进行主动搜索， 得到满足小区重选条件的其它相邻小区， 并 驻留到所述小区的步骤包括： 终端通过主动搜索， 获取其支持的除所述第一相邻小区 列表中的相邻小区以外的其它相邻小区， 形成第二相邻小区列表； 通过对所述第二相 邻小区列表中的各相邻小区分别进行小区测量， 确定各相邻小区的优先级； 选取优先 级最高的相邻小区， 并判断所述优先级最高的相邻小区是否满足小区重选条件； 若所 述优先级最高的相邻小区满足小区重选条件， 则驻留到所述优先级最高的相邻小区。 优选地， 所述的形成第二相邻小区列表的步骤包括： 终端主动搜索其支持的频点 和网络制式， 得到所述服务小区的所有相邻小区； 在所得到所有相邻小区中删除所述 第一相邻小区列表中的相邻小区， 得到由剩余的相邻小区形成的第二相邻小区列表。 优选地，所述的通过对所述第二相邻小区列表中的各相邻小区分别进行小区测量， 确定各相邻小区的优先级的步骤包括： 通过对所述第二相邻小区列表中的各相邻小区 分别进行小区测量， 得到各相邻小区的信号强度和质量； 利用所述各相邻小区的信号 强度和质量， 分别得到各相邻小区的优先级， 并按照优先级由高到低的顺序进行排列。 优选地， 所述的判断所述优先级最高的相邻小区是否满足小区重选条件的步骤包 括： 当所述优先级最高的相邻小区满足 S标准， 且其优先级高于所述服务小区优先级 的持续时间大于预设重选时间时， 判断所述优先级最高的相邻小区是否满足小区重选 条件。 优选地， 在驻留到所述满足小区重选条件的其它相邻小区的步骤之后， 还包括： 终端监测原服务小区的信号质量； 若原服务小区的信号质量优于所述当前驻留小区的 持续时间大于预设重选时间时， 终端再次驻留到原服务小区。 根据本发明的另一方面， 提供了一种终端小区重选装置， 包括： 获取模块， 设置 为在终端根据服务小区的信号质量或业务性能进行小区重选时， 从系统侧获取第一相 邻小区列表； 选取模块， 设置为从所述第一相邻小区列表中选取满足小区重选条件的 相邻小区； 重选模块，若所述第一相邻小区列表中的相邻小区均不满足小区重选条件， 则终端进行主动搜索， 得到满足小区重选条件的其它相邻小区， 并驻留到所述满足小 区重选条件的其它相邻小区。 优选地，当终端的业务性能下降且业务性能下降的持续时间大于预设下降时间时， 终端进行小区重选。 优选地， 所述重选模块还设置为在监测到原服务小区的信号质量优于所述当前驻 留小区的持续时间大于预设重选时间时， 再次驻留到原服务小区。 与现有技术相比较， 本发明的有益效果在于： 本发明使终端在弱信号下， 主动搜 索周围存在的最优小区并驻留， 有利于提升无线性能， 改善用户体验。 附图说明 图 1是现有技术提供的 LTE小区选择参数含义图表; 图 2是现有技术提供的同频小区重选参数含义图表； 图 3是现有技术提供的同频小区重选流程图； 图 4是现有技术提供的异频小区重选流程图； 图 5是本发明提供的终端小区重选方法原理框图； 图 6是本发明提供的终端小区重选装置框图； 图 7是本发明实施例提供的终端同频小区重选流程图； 图 8是本发明实施例提供的终端异频小区重选流程图。 具体实施方式 以下结合附图对本发明的优选实施例进行详细说明， 应当理解， 以下所说明的优 选实施例仅用于说明和解释本发明， 并不用于限定本发明。 图 5是本发明提供的终端小区重选方法原理框图， 如图 5所示， 步骤包括： 步骤 S101 : 当终端根据服务小区的信号质量或业务性能进行小区重选时， 从系统 侧获取第一相邻小区列表。 以同频小区重选为例， 当当前服务小区的信号质量 Ss 不大于同频小区重选阈值 Sintmsearch时， 终端进行相邻小区测量以决定是否进行重选。 或者， 当终端的业务性 能下降且业务性能下降的持续时间大于预设下降时间时， 终端进行小区重选。 其中， 上述第一相邻小区列表中的相邻小区是终端当前服务小区的所有相邻小区 中的一部分， 是从系统侧下发的系统消息中获取的。 步骤 S102: 从第一相邻小区列表中选取满足小区重选条件的相邻小区。 以同频小区重选为例， 终端对第一相邻小区列表中的各相邻小区进行小区测量， 计算各相邻小区的 rank值，并按照 rank值从大到小的顺序排列。如果某个相邻小区的 信号质量 St满足 S准则，且其优先级大于当前服务小区优先级的持续时间大于预设重 选时间， 则确定相邻小区为满足小区重选条件的相邻小区， 否则， 确定相邻小区为不 满足小区重选条件的相邻小区。 步骤 S103 : 若第一相邻小区列表中的相邻小区均不满足小区重选条件， 则终端进 行主动搜索， 得到满足小区重选条件的其它相邻小区， 并驻留到满足小区重选条件的 其它相邻小区。 终端主动搜索其支持的频点和网络制式， 得到服务小区的所有相邻小区， 在所得 到所有相邻小区中删除第一相邻小区列表中的相邻小区， 得到由剩余的相邻小区形成 的第二相邻小区列表。 对第二相邻小区列表中的各相邻小区分别进行小区测量， 得到 各相邻小区的信号强度和质量； 利用各相邻小区的信号强度和质量， 分别得到各相邻 小区的优先级。 按照优先级由高到低的顺序进行排列， 选取优先级最高的相邻小区， 并判断优先级最高的相邻小区是否满足小区重选条件， 若优先级最高的相邻小区满足 S准则， 且其优先级高于服务小区优先级的持续时间大于预设重选时间 Treselection, 则判断优先级最高的相邻小区是否满足小区重选条件， 并驻留到优先级最高的相邻小 区。 在驻留到满足小区重选条件的其它相邻小区的歩骤之后， 终端监测原服务小区的 信号质量， 若原服务小区的信号质量优于当前驻留小区的持续时间大于预设重选时间 时， 终端再次驻留到原服务小区。 图 6是本发明提供的终端小区重选装置框图， 如图 6所示， 包括实现图 5所示各 步骤的获取模块 21、 选取模块 22和重选模块 23， 其中： 获取模块 21在终端根据服务小区的信号质量或业务性能进行小区重选时，从系统 侧获取第一相邻小区列表，选取模块 22从第一相邻小区列表中选取满足小区重选条件 的相邻小区， 若第一相邻小区列表中的相邻小区均不满足小区重选条件， 则重选模块 23进行主动搜索， 得到满足小区重选条件的其它相邻小区， 并驻留到满足小区重选条 件的其它相邻小区。重选模块 23还设置为在监测到原服务小区的信号质量优于当前驻 留小区的持续时间大于预设重选时间时， 再次驻留到原服务小区。 本发明除了遵循网络侧规定的小区重选准则外， 还增加终端侧给定的用户体验判 断条件,用以动态提高进行邻小区测量的门限值， 当发现终端用户体验比门限值较差， 并且邻小区列表中的小区均不符合重选条件时， 主动搜索支持频段下除邻小区之外的 各频点， 按照 PLMN、 LAC、 RAT, 曾驻留过的小区等对需要进行搜索的频点和网络 制式依次进行扫描， 根据信号强度和质量赋加权值并排序， 然后选择合适的目标小区 进行注册； 最后再给定一个周期性定时器， 超时后再次主动测量之前的服务小区是否 已经脱离弱信号区， 若是， 则返回原服务小区。 本发明的创新包括以下部分： 1.终端侧给定用户体验差的判断条件： 语音和数据业务性能下降持续时间 Tduratl。n2 大于指定值 （可由用户设置， 推荐 20〜60s)， 并认为此时处于弱信号服务区；
2.处于弱信号服务区并且邻小区列表中的小区均不符合重选条件时， 主动搜索支 持频段下除邻小区之外的各频点； 3.对上述小区、 频点和网络制式赋加权值并排序， 选择最优的目标小区进行注册；
4.重选到的新小区后， 启动计时器， 测量原小区信号质量；
5.原小区信号质量好于新小区的时间超过阀值后， 返回原服务小区。 图 7 是本发明实施例提供的终端同频小区重选流程图， 如图 7 所示， 以下标号 【1010】至【1070】是现有同频小区重选流程， 其余是本发明实施例增加的流程。 【1010】
LTE驻留到合适的小区， 停留适当的时间 （1秒钟） 后， 就可以进行小区重选 的过程。 通过小区重选， 可以最大程度地保证空闲模式下的 UE驻留在合适的小区。 在空闲模式下， 通过对服务小区 Cs和临近小区 Cn测量值的监控， 来触发小区 重选。 重选触发条件的核心内容就是： 存在有比服务小区更好的小区， 且更好小区在 一段时间内都保持最好。 这样一方面 UE尽量重选到更好的小区去， 另一方面又保证 了一定的稳定性， 避免频繁的重选震荡。
LTE中的小区重选， 分为同频的小区重选和异频的小区重选 （包括不同 RAT之 间的小区重选）两种。 与小区重选有关的参数来源于服务小区的系统消息 SIB3， SIB4 和 sm5。 SIB3中包含了小区同频和异频 （包括 Inter— RAT) 重选的信息。
【1020、 1030、 1040】 以同频重选为例， 在 intraFreqCellReselectionlnfo 中， 定义了和同频小区重选有关 的参数。 其中： Sintrasearch用于进行同频小区重选时， 判断是否进行同频小区重选的 门限参数。 当 LTE服务小区的 S值 Ss小于等于 Sintrasearch时，就要执行同频小区重选测量； 另外如果此 Sintrasearch参数没有在系统消息内广播， 也要执行同频小区重选测量。除 此之外， UE可以选择不进行测量。
【1080、 1090】 当 LTE服务小区的 S值 Ss大于 Sintrasearch时， 先判断是否用户界面设置了信号 优化， 若是， 且 IDLE之前的非 IDLE 态下， 语音或数据业务性能下降， 持续时间 Tduratl0„2 >用户指定的弱信号超时优化时间 TUS (推荐 20s〜60s)， 则将当前 Ss值保 存在变量 Ssl中。 并开始进行小区测量。 若上述两个条件不同时满足， 则停留在当前服务区， 不进行测量。 【1040、 1050、 1060、 1070】
UE从当前服务小区 Cs广播的系统消息中获取邻小区列表 Cn，并对其中的目标小 区 Ct进行小区测量， 计算 rank值， 并从大到小排序。 t-Reselection定义了小区选择的时间间隔。 此外， 在 intraFreqCell- Reselectionlnfo 中还定义了与移动性相关的一些小区重选的参数。 SIB4中包含了同频小区重选有关的小区相关信息， 在 intraFreqNeighborCelllnfo 中定义了用于同频重选的小区物理 ID列表以及对应的偏移量值。偏移量值用于进行小 区重选排序 R准则 （下面将会介绍） 的公式计算， 目的是为了减少重选振荡。 在 SIB4中也定义了不能用于同频重选的小区黑名单列表。 对于同频的小区， 或者异频但具有同等优先级的小区， UE采用 R准则对小区进 行重选排序。 所谓 R准则， 是指， 对于服务小区的 Rs和目标小区的 Rt分别满足：
Rs = Qmeas,s +QHyst Rt = Qmeas,t— Qoffset 其中， Qmeas是测量小区的 RSRP值， Qoffset定义了目标小区的偏移值， 对于具 有同等优先级的异频小区来说，包括基于小区的偏移值和基于频率的偏移值两个部分。 如果目标小区在 Treselection时间内（同频和异频的 Treselection可能不同）满足 S 标准， 且 Rt持续超过 Rs， 那么 UE就会重选到目标小区。 【1100至 1150】 如果搜索完服务小区广播的系统消息中给出的邻小区列表， 却仍然没有找到合适 的小区， 就需要扫描所有同频小区， 生成手机端自主搜索到的所有邻小区列表 Ca。 删除相邻小区列表 Ca中所有属于邻小区列表 Cn (从系统消息中获取的）的小区， 因为这些小区已经扫描过了。 对这些不属于 Cn的但属于 Ca的小区进行测量。并将当前同频小区列表 Ca按 Rank 值从大到小排序。
【1160至 1180】 如果同频小区列表 Ca 中的目标小区 Ct在 Treselection 时间内 （同频和异频的 Treselection可能不同） 满足 S标准， 且 Rt持续超过 Rs， 那么 UE就会自主重选到这 个信号最强最好的目标小区 Ct。 反之， 若小区列表 Ca中的所有小区都不满足【1160】的条件， 则表明目前所有邻 小区都不满足重选条件， UE只能继续驻留原服务小区 Cs。
【1190至 1220] UE自主重选到不属于系统广播消息中给出的邻小区列表 Cn的目标小区 Ct，只是 一个手机侧的非标准流程， 所以在原服务小区信号强度和质量恢复后， 仍应优先重选 回邻小区列表 Cn中的小区 Cs。 而此时， 若 Ct和 Cs的信号质量都变差， 就必须在 Cn中重选。 图 8 是本发明实施例提供的终端异频小区重选流程图， 如图 8 所示， 以下标号 【1010】至【1070】是现有异频小区重选流程， 其余是本发明增加的流程。
【1010】 在异频小区重选过程中， eNodeB可以通过对各频点设置不同的优先级参数来实现 不同频点小区的负载均衡。 LTE驻留到合适的小区， 停留适当的时间 （1秒钟） 后， 就可以进行小区重选的过程。
【1011、 1012] 对于系统信息指出的优先级高于当前频率优先级的频率，UE总是执行对这些高优 先级频率的测量。
【1013】 对于高优先级频点的小区重选， 在满足以下条件后进行。 1 ) 高优先级频率小区 Squal > ThreshX, HighQ 且持续时间超过 Treseleetl。nRAT;
2) 高优先级频率小区 Srxlev > ThreshX, HighP且持续时间超过 Treseleetl。nRAT; UE驻留原小区时间超过 ls。 如果最高优先级上多个相邻小区符合标准，则选择最高优先级频率上的最优小区。 【1020、 1030、 1040】 对于系统信息指出的优先级等于或低于当前频率优先级的频率，UE的测量准则如 下：
1 ) 如果服务小区的 s值大于异频重选门限值 sn。nmtraseareh， 不执行测量；
2) 如果服务小区的 S值小于或等于异频重选门限值 S n。nmtraseareh， 执行测量。 【1041、 1042】 对于低优先级频率的小区重选， 在满足以下条件后进行：
1 ) 没有高优先级频率的小区符合重选要求；
2) 没有同等优先级频率的小区符合重选要求； 3 ) 月艮务小区的 Squal<ThreshServing,LowQ；
4) 目标小区的 Squal>Thresh X,LowQ且持续时间超过 TreselectionRAT; 5 ) 服务小区的 Srxlev<ThreshServing,LowP;
6) 目标小区的 S Srxlev>ThreshX,LowP且持续时间超过 TreselectionRAT;
7) UE驻留原小区时间超过 ls。 【1080、 1090】 当 LTE服务小区的 S值 SS大于 S nonlntrasearch时， 先判断是否用户界面设置了信号 优化， 若是， 且 IDLE之前的非 IDLE 态下， 语音或数据业务性能下降， 持续时间 Tduratl0„2 >用户指定的弱信号超时优化时间 TUS (推荐 20s〜60s)， 则将当前 Ss值保 存在变量 Ssl中， 并开始进行小区测量。 若上述两个条件不同时满足， 则停留在当前服务区， 不进行测量。 【1050、 1060、 1070】 对于同等优先级频点， 采用同频小区重选的 R准则。 R准则， 是指， 对于服务小区的 Rs和目标小区的 Rt分别满足： Rs = Qmeas,s +QHyst
Rt = Qmeas,t— Qoffset 其中， Qmeas是测量小区的 RSRP值， Qoffset定义了目标小区的偏移值， 对于具 有同等优先级的异频小区来说，包括基于小区的偏移值和基于频率的偏移值两个部分。 如果目标小区在 Tresd∞tl。n时间内 （同频和异频的 Tresd∞tl。n可能不同， 所以图 8中， 用 Tresd∞tl。nRAT来表示） 满足 S标准， Rt持续超过 Rs， 那么 UE就会重选到目标小区。
【1100至 1150】 如果搜索完服务小区广播的系统消息中给出的邻小区列表， 却仍然没有找到合适 的小区， 就需要扫描所有相邻小区， 包括同频和异频， 生成手机端自主搜索到的所有 邻小区列表 Ca。 删除邻小区列表 Ca中所有属于邻小区列表 Cn (从系统消息中获取的） 的小区， 因为这些小区已经扫描过了。 对这些不属于 Cn的但属于 Ca的小区进行测量，并将当前同频小区列表 Ca按 Rank 值从大到小排序。
【1160至 1180】 如果同频小区列表 Ca中的目标小区 Ct在 Tresd∞tl。n时间内（同频和异频的 Tresd∞tl。n 可能不同， 所以图 8中， 用！^^^^^来表示） 满足 S标准， Rt持续超过 Rs， 那么 UE就会自主重选到这个信号最强最好的目标小区 Ct。 反之， 若小区列表 Ca中的所有小区都不满足【1160】的条件， 则表明目前所有相 邻小区都不满足重选条件， UE只能继续驻留原服务小区 Cs。
【1190至 1220]
UE自主重选到不属于系统广播消息中给出的相邻小区列表 Cn的目标小区 Ct，只 是一个手机侧的非标准流程， 所以在原服务小区信号强度和质量恢复后， 仍应优先重 选回相邻小区列表 Cn中的小区 Cs。 而此时， 若 Ct和 Cs的信号质量都变差， 就必须在 Cn中重选。 尽管上文对本发明进行了详细说明， 但是本发明不限于此， 本技术领域技术人员 可以根据本发明的原理进行各种修改。 因此， 凡按照本发明原理所作的修改， 都应当 理解为落入本发明的保护范围。 工业实用性 通过上述实施例及优选实施方式， 能够达到以下效果： 能够使终端在弱信号下， 主动搜索周围存在的最优小区并驻留， 有利于提升无线性能， 改善用户体验。

Claims

权 利 要 求 书 、 一种终端小区重选的方法， 包括以下步骤： 当终端根据服务小区的信号质量或业务性能进行小区重选时， 从系统侧获 取第一相邻小区列表；
从所述第一相邻小区列表中选取满足小区重选条件的相邻小区； 若所述第一相邻小区列表中的相邻小区均不满足小区重选条件， 则终端进 行主动搜索， 得到满足小区重选条件的其它相邻小区， 并驻留到所述满足小区 重选条件的其它相邻小区。 、 根据权利要求 1所述的方法， 其中， 当终端的业务性能下降且业务性能下降的 持续时间大于预设下降时间时， 终端进行小区重选。 、 根据权利要求 1所述的方法， 其中， 所述的终端进行主动搜索， 得到满足小区 重选条件的其它相邻小区， 并驻留到所述小区的步骤包括： 终端通过主动搜索， 获取其支持的除所述第一相邻小区列表中的相邻小区 以外的其它相邻小区， 形成第二相邻小区列表；
通过对所述第二相邻小区列表中的各相邻小区分别进行小区测量， 确定各 相邻小区的优先级； 选取优先级最高的相邻小区， 并判断所述优先级最高的相邻小区是否满足 小区重选条件； 若所述优先级最高的相邻小区满足小区重选条件， 则驻留到所述优先级最 高的相邻小区。 、 根据权利要求 3所述的方法，其中，所述的形成第二相邻小区列表的步骤包括: 终端主动搜索其支持的频点和网络制式， 得到所述服务小区的所有相邻小 区； 在所得到所有相邻小区中删除所述第一相邻小区列表中的相邻小区， 得到 由剩余的相邻小区形成的第二相邻小区列表。 、 根据权利要求 3所述得到方法， 其中， 所述的通过对所述第二相邻小区列表中 的各相邻小区分别进行小区测量， 确定各相邻小区的优先级的步骤包括： 通过对所述第二相邻小区列表中的各相邻小区分别进行小区测量， 得到各 相邻小区的信号强度和质量； 利用所述各相邻小区的信号强度和质量， 分别得到各相邻小区的优先级， 并按照优先级由高到低的顺序进行排列。 、 根据权利要求 3所述的方法， 其中， 所述的判断所述优先级最高的相邻小区是 否满足小区重选条件的步骤包括：
当所述优先级最高的相邻小区满足 S标准的信号质量大于 0， 且其优先级 高于所述服务小区优先级的持续时间大于预设重选时间时， 判断所述优先级最 高的相邻小区是否满足小区重选条件。 、 根据权利要求 1-6任意一项所述的方法， 其中， 在驻留到所述满足小区重选条 件的其它相邻小区的步骤之后， 还包括：
终端监测原服务小区的信号质量； 若原服务小区的信号质量优于所述当前驻留小区的持续时间大于预设重选 时间时， 终端再次驻留到原服务小区。 、 一种终端小区重选的装置， 包括： 获取模块， 设置为在终端根据服务小区的信号质量或业务性能进行小区重 选时， 从系统侧获取第一相邻小区列表； 选取模块， 设置为从所述第一相邻小区列表中选取满足小区重选条件的相 邻小区； 重选模块，若所述第一相邻小区列表中的相邻小区均不满足小区重选条件， 则终端进行主动搜索， 得到满足小区重选条件的其它相邻小区， 并驻留到所述 满足小区重选条件的其它相邻小区。 、 根据权利要求 8所述的装置， 其中， 当终端的业务性能下降且业务性能下降的 持续时间大于预设下降时间时， 终端进行小区重选。 0、 根据权利要求 8或 9所述的装置， 其中， 所述重选模块还设置为在监测到原服 务小区的信号质量优于所述当前驻留小区的持续时间大于预设重选时间时， 再 次驻留到原服务小区。
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