WO2012065482A2 - 一种控制小区重选的方法及无线通信终端 - Google Patents

一种控制小区重选的方法及无线通信终端 Download PDF

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Publication number
WO2012065482A2
WO2012065482A2 PCT/CN2011/080425 CN2011080425W WO2012065482A2 WO 2012065482 A2 WO2012065482 A2 WO 2012065482A2 CN 2011080425 W CN2011080425 W CN 2011080425W WO 2012065482 A2 WO2012065482 A2 WO 2012065482A2
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Prior art keywords
cell
reselection
frequent
list
terminal
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PCT/CN2011/080425
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English (en)
French (fr)
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WO2012065482A3 (zh
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相海涛
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中兴通讯股份有限公司
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Publication of WO2012065482A2 publication Critical patent/WO2012065482A2/zh
Publication of WO2012065482A3 publication Critical patent/WO2012065482A3/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
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H04W36/008375—Determination of triggering parameters for hand-off based on historical data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to a method of controlling cell reselection and a wireless communication terminal. Background technique
  • RPLMN Public Land Mobile Network
  • PLMN public land mobile communication network
  • This information can be obtained from the SIB11 message of the camping cell.
  • the mobile terminal After the mobile terminal selects a certain cell as the current serving cell, the mobile terminal will camp on the selected cell if the cell level signal does not change much, after which, in order to ensure continuous and high quality Service, the mobile device measures the current network environment, including the current serving cell and surrounding neighbor cells of the mobile device, and the mobile device will reselect to the quality of service or signal strength under the control parameter control conditions. Community.
  • a mobile device can periodically broadcast various system messages of a BCCH (Broadcast Control Channel) channel, which includes the required neighbor cell frequency configuration of the cell reselection, and the mobile terminal will The configured BCCH carrier of the neighboring cell frequency is monitored, and the parameters of the current cell reselection are obtained by decoding the 6 strongest BCCH carrier information. And in the process of continuous measurement and decoding, if the neighboring cell is found to satisfy the condition of cell reselection, the mobile device will initiate a cell reselection process.
  • BCCH Broadcast Control Channel
  • the serving cell level fluctuates greatly, and the neighboring cells existing in the monitoring set are constantly changing and adjusting, for example, the monitoring set cell.
  • the number, the priority order of the cells, etc. then the operation of the measurement operation, the synchronization operation, and the decoding of the BCCH channel for the changed cell are greatly increased, and the energy consumption of the mobile device is greatly increased. Reduce standby time.
  • this method does not consider other conditions in the cell reselection process, such as measuring whether the cell is accessible, measuring whether the cell belongs to the owning PLMN, and if the reselected target cell is set to be prohibited by the operator (or the location) The cell is forbidden to access) or the cell does not belong to its home network.
  • the terminal continuously tries to access, it needs to perform the cell selection process every time, perform frame synchronization, decode BCCH broadcast information, etc., and frequently synchronize the decoding operation. Inevitably, it will bring more energy consumption.
  • the existing implementation method faces the problem that the measurement quality is judged single (either Ec/No or RSCP), and the hysteresis parameter (network side delivery) is not flexible. Summary of the invention
  • the object of the present invention is to overcome the shortcomings of the prior art, to provide a method and terminal capable of performing cell reselection operations more efficiently, to provide a better user experience, and to reduce cell reselection energy consumption.
  • the present invention provides a method for controlling cell reselection, and determines whether frequent reselection occurs by recording the number of times of cell camping in a unit time. If frequent reselection occurs, a frequent reselection protection policy is initiated, and the secondary priority cell is activated. Recording is prohibited to reselect the cell list, so that the terminal is stationed as much as possible in a cell with high quality of service or relatively stable signal level.
  • the initiating a frequent reselection protection policy includes increasing a reselection hysteresis parameter.
  • the recording the secondary priority cell to the list of forbidden reselected cells includes: moving the neighboring cell with the most number of times of camping into the list of forbidden reselected cells, and reordering the neighboring cell list.
  • the neighboring cell list reordering rule is performed according to Ec/No or RSCP or RSSI.
  • K is a constant and defaults to 1.
  • the method further includes: reading configuration information, and initializing prohibiting reselection of the cell list and successfully reselecting the cell list; and the configuration information includes a reselection granularity threshold.
  • the method further includes:
  • the reselected cell is not in the reselected cell list, further determining whether the target cell is successfully reselecting the cell list;
  • the target cell is not successfully reselecting the cell list, it is further determined whether the cell reselection granularity threshold is greater than a preset value, and if it is greater than, the frequent reselection protection policy is initiated.
  • the present invention also provides a wireless communication terminal, where the wireless communication terminal includes: a measurement module, an adaptive module, and a decision module, where
  • the measuring module measures the neighboring cell, obtains network parameters of the neighboring cell, and sorts the measured cell according to the measurement result;
  • the adaptive module collects measurement parameters sent by the network side, and dynamically adjusts measurement parameters according to the state of the terminal;
  • the decision module performs a cell reselection procedure in accordance with the protocol.
  • performing the cell reselection process according to the protocol includes: starting a frequent reselection protection policy if a frequent reselection occurs, and recording the secondary priority cell to the list of forbidding the reselection of the cell, so that the terminal is stationed in the service quality or the signal is as high as possible.
  • a relatively stable cell is possible.
  • the network parameter includes one or more of the following: FDD or TDD cell
  • the sorting the measurement cells according to the measurement result includes: sorting the neighboring cells according to the 3GPP protocol TS25.304, sorting according to Ec/Io or RSCP for the FDD or the TDD cell, and performing cell sorting according to the RSSI for the GSM cell.
  • the mobile terminal records the access information of the neighboring cell, so that the mobile terminal can know whether the target cell belongs to the access before the cell reselection is initiated, and the mobile terminal is avoided because the target cell is It is forbidden or inaccessible to decode BCCH information, which reduces standby energy consumption and improves the operating efficiency of the protocol stack.
  • the reselection parameters are dynamically adjusted according to the wireless environment, avoiding frequent reselection problems caused by frequent fluctuations of cell levels. , improve the quality of wireless communication services and user experience.
  • 1 is a structure for prohibiting reselection of a cell in the embodiment of the present invention
  • FIG. 2 is a structural diagram of successfully reselecting a cell in the embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a terminal module for controlling cell reselection according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for controlling cell reselection according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of steps of frequently re-selecting a protection policy in an embodiment of the present invention. detailed description
  • the embodiment provides a method and a terminal for controlling cell reselection, and determines whether frequent reselection occurs by recording the number of times of cell camping in a unit time. If frequent reselection occurs, a frequent reselection protection policy is started, and the reselection hysteresis parameter is appropriately adjusted. And recording the secondary priority cell to the list of forbidden reselection cells, so that the terminal is camped on the cell with higher quality of service or relatively stable signal level.
  • the present invention provides a terminal and method for controlling cell reselection. By recording the cell reselection information on the terminal side and dynamically adjusting the reselection parameters according to the network environment, frequent reselection can be effectively avoided. As shown in FIG. 1 , the cell list structure is prohibited from being reselected in the embodiment of the present invention: field S101 is a cell primary scrambling code PSC.
  • Field S102 is the PLMN to which the cell belongs.
  • the field S103 is the frequency point FREQ to which the cell belongs.
  • the field S104 is the band group BAND CLASS to which the cell belongs.
  • the field S105 is the location area identifier LAC to which the cell belongs.
  • Field S106 is a cell forbidden access reason FORBIDDEN REASON.
  • Field S107 is the last timestamp modified TIMESTAMPo
  • the cell list structure is successfully reselected in the embodiment of the present invention:
  • Field S201 is the cell primary scrambling code PSC.
  • Field S202 is the PLMN to which the cell belongs.
  • the field S203 is the frequency point FREQ to which the cell belongs.
  • the field S204 is the band group BAND CLASS to which the cell belongs.
  • the field S205 is the location area identifier LAC to which the cell belongs.
  • Field S206 is the cell reselection station count RESELECTION COUNT.
  • Field S207 is the last modified timestamp TIMESTAMPo
  • FIG. 3 it is a schematic diagram of a terminal module for controlling cell reselection according to an embodiment of the present invention, where the terminal includes: a measurement module, an adaptive module, and a decision module.
  • the measurement module is responsible for initiating measurement of the neighboring cell in the monitoring set, obtaining network parameters of the neighboring cell, and sorting the measured cells according to the measurement result.
  • the network parameters include Ec/Io or RSCP parameters of the FDD or TDD cell, and RSSI parameters of the GSM cell.
  • the neighboring cell is sorted according to the 3GPP protocol TS25.304 for the FDD or the TDD cell may be sorted according to Ec/Io or RSCP, and the GSM cell may be sorted according to the RSSI.
  • the adaptive module is configured to collect measurement parameters sent by the network side, and according to the status of the terminal. Dynamically adjust measurement parameters, for example, try to avoid frequent reselection.
  • the decision module is responsible for performing a cell reselection procedure in accordance with the protocol.
  • the frequent reselection protection policy is started, the secondary priority cell is recorded to the list of the reselected cell, so that the terminal is camped on the cell with higher quality of service or relatively stable signal level.
  • FIG. 4 it is a schematic flowchart of a method for controlling cell reselection according to an embodiment of the present invention, which includes the following steps:
  • Step S401 The mobile terminal starts booting, reads EFS file or NV configuration information, initializes prohibiting reselection of the cell list, and successfully reselecting the cell list;
  • Configuration information includes reselection granularity threshold N, time interval T, number of reselections N, hysteresis increment parameter RSTEP, and high quality cell signal strength threshold PREF_SELECTION_THRESHOLD. Clear the list of re-selected cells and re-select the successful cell list.
  • Step S402 The mobile terminal performs normal network registration, PLMN selection, cell selection, location update, and route update operation.
  • Step S403 Perform measurement on the neighboring cell, and sort the neighboring cells according to the network side configuration.
  • the neighboring cells are sorted according to the 3GPP protocol TS25.304.
  • the FDD or TDD cells may be sorted according to Ec/Io or RSCP, and the GSM cell may be followed.
  • the RSSI performs cell sorting.
  • this embodiment always considers that the 3G cell is the priority cell, that is, the priority is added to the 3G cell to join the priority factor Pr, and not only the cell signal or the interference situation is considered, thereby preventing continuous 3G coverage.
  • the terminal re-selection to the 2G network the user experience can be effectively improved.
  • Step S404 Determine whether the reselected cell is prohibited from reselecting the cell list.
  • step S411 determining whether the reselected cell is in the reselection of the cell list, if the reselection of the cell list is prohibited, the reselection operation is stopped, step S411 is performed; otherwise, step S405 is performed;
  • Step S405 determining whether the target cell is successfully reselecting the cell list, and if yes, entering the step Step S406, otherwise step S407;
  • Step S406 Check whether the re-selection granularity threshold of the cell is greater than a preset value, if yes, proceed to step S407, otherwise continue to re-select the camping process to perform step S408;
  • Step S407 Start a reselection protection policy.
  • the adaptive reselection parameters Qhystls or Qhyst2s are dynamically adjusted according to the network state, each time RSTEP is incremented, the reselection hysteresis is increased, the neighbor cells are reordered, and the UE is kept at the current quality of service as much as possible.
  • a cell with a higher or more stable signal level, and a neighbor cell with a lower reselection frequency is added to the list of the reselected cell to prevent the terminal from being frequently reselected to the secondary priority.
  • Step S408 normal camping
  • Step S409 Check whether the camping is successful. If the camping is successful, go to step S410; otherwise, go to step S411.
  • Step S410 Record the cell to successfully reselect the cell list, record the cell information including the primary scrambling code, the frequency point, the stationing time, and add 1 to the number of stations, and then perform step S412;
  • the reselected successful cell information including the stationing time, frequency point information, cell ID, scrambling code information, etc., and the number of stations is increased by one; if the reselection fails, it is necessary to check whether the cell is bar or prohibited from accessing, whether the country code and the network code are Consistent with the network to which it belongs, if the cell is forbidden or the network code is inconsistent, join the d, the area to the re-selection d, and the area list to prevent the next re-election from being initiated to the cell.
  • Step S411 If the camping fails, check whether the cell is reserved by the operator or whether the cell is prohibited from being accessed (issued in the system message) and whether the country code network code of the cell is the same as the country code and the network code in the SIM/USIM. If the cell is added to the list of forbidden reselection cells, the next time the cell is not reselected to the cell;
  • Step S412 End.
  • the reselection granularity refers to the number N of reselection within a unit time T, the time interval T, and the number of reselections N;
  • the adaptive parameter RSTEP is an adjustment parameter for dynamically adjusting the delay
  • the hysteresis parameters which are stored in the terminal non-volatile memory (NV) or EFS file, can be set or adjusted.
  • the calculation of the priority of the neighboring cell list may be sorted according to the 3GPP protocol TS25.304 for the FDD or TDD cell according to Ec/Io or RSCP, and the GSM cell may be sorted according to the RSSI.
  • the target cell refers to a cell in the neighboring cell list and the calculated R value (priority) is higher than that of the current serving cell.
  • the parameter Qhystls or Qhyst2s is sent by the network side and used for cell reselection.
  • the cell reselection indicator is set to CPICH RSCP
  • Qhystls is used
  • CPICH EC/NO is used.
  • Hysteresis increment parameter RSTEP is an increment that is stored in the EFS file or non-volatile memory on the terminal side to adjust the hysteresis difference.
  • FIG. 5 it is a schematic diagram of the steps of frequently re-selecting a protection policy in the embodiment of the present invention, which mainly includes the following steps:
  • Step S501 Increase the reselection hysteresis parameter and step up RSTEP.
  • the reselection hysteresis parameter is a parameter sent by the network side to the terminal, and the step increasing RSTEP parameter is an adjustment parameter for dynamically adjusting the hysteresis parameter, stored in the terminal non-volatile memory (NV) or EFS file, and Set to experience or dynamic adjustment.
  • the reselection hysteresis parameter is a deviation value of the current serving cell signal quality when the terminal performs cell reselection to sort the neighbor cells, and the neighboring cell subtracts the same offset value, so as to appropriately open the current cell and the neighbor cell. The signal quality, so that when the neighbor cell level is within a reasonable range of variation, it will not be reselected, which can effectively suppress the ping-pong effect and avoid frequent reselection.
  • Step S502 Move the neighboring cell with the most number of times of camping into the list of forbidden reselected cells, and reorder the neighboring cell list.
  • the ordering rule is based on Ec/No or RSCP or RSSI, and the priority factor Pr is added to the 3G cell.
  • K is a constant, and the default is 1.
  • the product of Ec/No and RSCP is smaller, the larger the Pr, the higher the priority coefficient of the region. That is, the better the signal strength and the signal quality, the smaller the absolute value and the smaller the product, and the more priority the cell is, the more likely it is to reselect to the 3G cell.
  • the purpose of this is to keep the dual-mode terminal in the 3G cell as much as possible. Even if the 2G signal is better than the 3G signal, the UE can be kept in the 3G cell as much as possible to improve the user experience.
  • Step S503 Perform a cell reselection camping process.
  • the object of the present invention is to overcome the shortcomings of the prior art, to provide a method and terminal capable of performing cell reselection operations more efficiently, to provide a better user experience, and to reduce cell reselection energy consumption.
  • the foregoing method for controlling cell reselection is adopted, where the mobile terminal records the access information of the neighboring cell, so that the mobile terminal can know whether the target cell belongs to the access before the cell reselection is initiated, and the mobile terminal is avoided. Because the target cell is disabled or inaccessible to decode the BCCH information, the standby power consumption is reduced, the operating efficiency of the protocol stack is improved, and the reselection parameters are dynamically adjusted according to the wireless environment, thereby avoiding the occurrence of frequent fluctuations in the cell level. Frequent re-election issues improve the quality of wireless communication services and the user experience.

Description

一种控制小区重选的方法及无线通信终端 技术领域
本发明涉及移动通信领域， 更具体地， 涉及一种控制小区重选的方法 及无线通信终端。 背景技术
随着移动通信技术的发展， 主流移动通信网络系统大都以蜂窝的形式 进行全方位的网络覆盖， 并且根据 3GPP规范 TS23.122规定， 当终端在开 机之后会首先选择已登记公众陆地移动通讯网 （Registered Public Land Mobile Network, RPLMN ), RPLMN是终端上次成功注册的网络， 如果在 手机内没有 RPLMN或者 RPLMN不可用时，终端会按照规定的顺序找到一 个可用的公众陆地移动通讯网 （ Public Land Mobile Network, PLMN ), 在 找到 PLMN之后， 终端会发起小区选择过程， 一旦终端选择到一个 "合适" 的小区驻留下来， 终端就会产生一个候选小区列表， 该列表包括已经被选 择的小区以及邻居小区的信息， 该信息可以从驻留小区的 SIB11 消息中获 得。 当移动终端选择某个小区作为当前的服务小区之后， 在小区电平信号 变化不大的情况下， 移动终端将驻留在选定的小区上， 在此之后， 为保证 获得持续和高质量的服务， 移动设备会对当前所处的网络环境进行测量， 包括移动设备的当前服务小区和周围邻居小区， 并且在满足测量参数控制 条件之下， 移动设备将重选到服务质量或者信号强度更好的小区。
例如在 GSM/WCDMA系统中，移动设备可以通过解码 BCCH (广播控 制信道）信道周期性的广播的各种系统消息， 其中就包含了小区重选的所 需要的邻小区频点配置， 移动终端会对配置的邻小区频点 BCCH载波进行 监测， 通过解码 6个最强的 BCCH载波信息， 获取当前小区重选的参数， 并在不断地测量和解码过程中， 如果发现邻小区满足小区重选的条件时， 移动设备将发起小区重选过程。
如果按照这种做法， 当移动设备当前处于电平波动频繁， 干扰较大的 环境时， 服务小区电平波动较大， 存在于监测集里的邻小区必然不断的进 行变化调整， 例如监视集小区个数、 小区优先级顺序等， 那么随之而来的 是对变化的小区的测量操作、 同步操作以及解码 BCCH信道等操作则会大 大加大， 同时也会大大增大移动设备的能耗， 降低待机时间。
其次， 这种^法没有考虑小区重选过程中的其他的条件， 例如测量小 区是否可接入， 测量小区是否属于所属 PLMN, 如果重选的目标小区被运 营商设置禁止接入（或者该位置区小区禁止接入）或者该小区不属于其归 属网络， 当终端不断尝试接入时， 伴随着每次都需要进行小区选择过程， 进行帧同步、 解码 BCCH广播信息等操作， 频繁地同步解码操作必然带来 更大的能量消耗； 同时， 已有实现方法面临测量质量评判单一 （要么是 Ec/No, 要么是 RSCP ), 迟滞参数（网络侧下发） 不灵活的问题。 发明内容
本发明的目的是克服现有技术中的缺点， 提供一种能够更加有效的进 行小区重选操作的方法及终端， 提供更好的用户体验， 并且降低小区重选 能耗。
为实现上述目的， 本发明提出一种控制小区重选的方法， 通过记录单 位时间内小区驻扎的次数判断是否发生频繁重选， 如果发生频繁重选则启 动频繁重选保护策略， 将次优先小区记录到禁止重选小区列表， 从而使得 终端尽量驻扎在服务质量较高或者信号电平相对稳定的小区。
进一步地， 所述启动频繁重选保护策略包括增大重选迟滞参数。
进一步地， 所述将将次优先小区记录到禁止重选小区列表包括： 将驻 扎次数最多的邻小区移入禁止重选小区列表， 并对邻小区列表重排序。 进一步地， 所述对邻小区列表重排序规则按照 Ec/No或者 RSCP或者 RSSI进行， 对于 3G小区增加优先因子 Pr, 优先因子 Pr的计算方法如下： Pr = k + 1/ ( IEc/No * RSCPI )
K为常数， 默认为 1。
进一步地， 在判断是否发生频繁重选之前还包括： 读取配置信息， 并 初始化禁止重选小区列表以及成功重选小区列表； 所述配置信息包括重选 粒度阀值。
进一步地， 在启动频繁重选保护策略之前还包括：
判断重选小区是否在禁止重选小区列表；
如果重选小区不在禁止重选小区列表， 则进一步判断目标小区是否在 成功重选小区列表；
如果目标小区不在成功重选小区列表， 则进一步判断该小区的重选粒 度阈值是否大于预设值， 如果大于则启动频繁重选保护策略。
本发明还提出一种无线通信终端， 所述无线通信终端包括： 测量模块、 自适应模块和判决模块， 其中，
所述测量模块对邻小区进行测量， 获得邻小区的网络参数， 并按照测 量结果对测量小区进行排序；
所述自适应模块收集网络侧下发的测量参数， 并根据终端的状态动态 调整测量参数；
所述判决模块按照协议执行小区重选过程。
进一步地， 按照协议执行小区重选过程包括： 如果发生频繁重选则启 动频繁重选保护策略， 将次优先小区记录到禁止重选小区列表， 从而使得 终端尽量驻扎在服务质量较高或者信号电平相对稳定的小区。
进一步地，所述网络参数包括以下一种或几种： FDD或者 TDD小区的 进一步地， 所述按照测量结果对测量小区进行排序包括： 邻小区的排 序按照 3GPP协议 TS25.304对于 FDD或者 TDD小区按照 Ec/Io或者 RSCP 进行排序， 对于 GSM小区按照 RSSI进行小区排序。
综上， 采用本发明的技术方案， 移动终端记录了相邻小区的接入信息， 使得移动终端可以在发起小区重选之前就知道目标小区是否属于可以接 入， 避免了移动终端因为目标小区被禁止或者不可接入而去解码 BCCH信 息， 降低了待机能耗， 提高了协议栈的运行效率； 同时根据无线环境动态 调整重选参数， 避免了因为小区电平频繁波动时而发生的频繁重选问题， 提高了无线通信服务质量和用户体验。 附图说明
图 1是本发明实施例中禁止重选小区列表结构；
图 2是本发明实施例中成功重选小区列表结构；
图 3是本发明实施例控制小区重选的终端模块示意图；
图 4是本发明实施例控制小区重选方法流程示意图；
图 5是本发明实施例中频繁重选保护策略步驟示意图。 具体实施方式
本实施例提供一种控制小区重选的方法及终端， 通过记录单位时间内 小区驻扎的次数判断是否发生频繁重选， 如果发生频繁重选则启动频繁重 选保护策略， 适当调整重选迟滞参数， 并将次优先小区记录到禁止重选小 区列表， 从而使得终端尽量驻扎在服务质量较高或者信号电平相对稳定的 小区。
下面结合附图和具体实施例对本发明的实现进行详细说明。
本发明提供一种控制小区重选的终端及方法， 通过终端侧记录小区重 选的信息并且根据网络环境动态调整重选参数， 可以有效避免频繁重选。 如图 1所示， 为本发明实施例中禁止重选小区列表结构： 字段 S101为小区主扰码 PSC。
字段 S102为小区所属 PLMN。
字段 S103为小区所属频点 FREQ。
字段 S104为小区所属频段组 BAND CLASS。
字段 S105为小区所属位置区标识 LAC。
字段 S106为小区禁止接入原因 FORBIDDEN REASON。
字段 S107为最后一次修改时间戳 TIMESTAMPo
如图 2所示， 为本发明实施例中成功重选小区列表结构：
字段 S201为小区主扰码 PSC。
字段 S202为小区所属 PLMN。
字段 S203为小区所属频点 FREQ。
字段 S204为小区所属频段组 BAND CLASS。
字段 S205为小区所属位置区标识 LAC。
字段 S206为小区重选驻扎计数 RESELECTION COUNT。
字段 S207为最后一次修改时间戳 TIMESTAMPo
如图 3 所示， 是本发明实施例控制小区重选的终端模块示意图， 所述 该终端包括： 测量模块、 自适应模块、 判决模块。
所述测量模块负责发起对监测集中的邻小区进行测量， 获得邻小区的 网络参数， 并按照测量结果对测量小区进行排序。 所述网络参数包括 FDD 或者 TDD小区的 Ec/Io或者 RSCP参数， GSM小区的 RSSI参数。
获得邻小区的测量结果后， 邻小区的排序按照 3GPP协议 TS25.304对 于 FDD或者 TDD小区可以按照 Ec/Io或者 RSCP进行排序， 对于 GSM小 区可以按照 RSSI进行小区排序。
所述自适应模块负责收集网络侧下发的测量参数， 并根据终端的状态 动态调整测量参数， 例如应尽量避免频繁重选。
所述判决模块负责按照协议执行小区重选过程。 当启动频繁重选保护 策略， 将次优先小区记录到禁止重选小区列表， 从而使得终端尽量驻扎在 服务质量较高或者信号电平相对稳定的小区。
如图 4所示， 是本发明实施例控制小区重选方法流程示意图， 包括如 下几个步驟：
步驟 S401: 移动终端启动开机， 读取 EFS文件或者 NV配置信息， 初 始化禁止重选小区列表以及成功重选小区列表；
配置信息包括重选粒度阀值 N, 时间间隔 T, 重选次数 N, 迟滞递增参 数 RSTEP , 以 及 高 质 量 小 区 信 号 强 度 阀 值 PREF_SELECTION_THRESHOLD。清空禁止重选小区列表以及重选成功小 区列表。
步驟 S402: 移动终端进行正常网络注册， PLMN选择、 小区选择、 位 置更新、 路由更新操作；
步驟 S403: 对邻小区进行测量， 并按照网络侧配置对邻小区进行排序； 邻小区的排序按照 3GPP协议 TS25.304对于 FDD或者 TDD小区可以 按照 Ec/Io或者 RSCP进行排序，对于 GSM小区可以按照 RSSI进行小区排 序。 同时对于 2G和 3G共存的情况下， 本实施例总是考虑以 3G小区为优 先小区， 即排序对于 3G小区加入优先因子 Pr, 而不仅仅考虑小区信号或者 干扰情况， 这样可以防止在 3G覆盖连续的情况下终端重选到 2G网络， 可 以有效提高用户体验。
步驟 S404: 判断重选小区是否在禁止重选小区列表；
进行重选， 判断重选小区是否在禁止重选小区列表， 如果在禁止重选 小区列表则停止重选操作， 执行步驟 S411; 否则执行步驟 S405;
步驟 S405: 判断目标小区是否在成功重选小区列表， 如果在则进入步 驟 S406 , 否则执行步驟 S407；
步驟 S406: 检查该小区的重选粒度阈值是否大于预设值， 如果大于， 则执行步驟 S407, 否则继续重选驻扎过程执行步驟 S408;
步驟 S407: 启动重选保护策略；
如果启用频繁小区重选保护策略， 则根据网络状态动态调整自适应重 选参数 Qhystls或 Qhyst2s, 每次递增 RSTEP, 增大重选迟滞， 对邻小区重 新排序， 使 UE尽量保持在当前的服务质量较高或者信号电平较稳定的小 区， 同时添加重选次数次低的邻居小区到禁止重选小区列表， 防止终端频 繁向次优先级重选。
步驟 S408: 正常驻扎；
步驟 S409: 检查驻扎是否成功， 如果驻扎成功， 执行步驟 S410; 否则 执行步驟 S411。
步驟 S410: 记录该小区到成功重选小区列表， 记录小区信息包括主扰 码、 频点、 驻扎时间， 并且对驻扎次数加 1 , 然后执行步驟 S412;
记录重选成功小区信息， 包括驻扎时间、 频点信息、 小区 ID、 扰码信 息等， 并且驻扎次数加一； 重选失败需要检查该小区是否被 bar或者禁止接 入， 国家码与网络码是否与所属网络一致， 小区被禁止或者网络码不一致 则加入该 d、区到禁止重选 d、区列表， 以防止下次继续向该小区发起重选。
步驟 S411: 驻扎失败， 则检查该小区是否被运营商保留或者小区是否 禁止接入 （在系统消息中有下发） 以及该小区的国家码网络码是否与 SIM/USIM中国家码和网络码相同，不同则将该小区加入到禁止重选小区列 表， 则下一次不会向该小区发起重选；
步驟 S412: 结束。
所述配置信息： 重选粒度是指单位时间 T以内重选的次数 N, 时间间 隔 T, 重选次数 N; 自适应参数 RSTEP是一个调节参数， 用来动态调节迟 滞参数， 这些参数都保存在终端非易失性内存（NV )或者 EFS文件中， 并 且可以设置或者调节。
邻近小区列表优先级的计算，按照 3GPP协议 TS25.304对于 FDD或者 TDD小区可以按照 Ec/Io或者 RSCP进行排序， 对于 GSM小区可以按照 RSSI进行小区排序。
目标小区是指在邻近小区列表中并且计算出的 R值（优先级） 高于当 前服务小区的小区。
参数 Qhystls或 Qhyst2s是由网络侧下发的， 用于小区重选的回差值， 当小区重选指标设置为 CPICH RSCP时采用 Qhystls, CPICH EC/NO时采 用 Qhyst2s。 迟滞递增参数 RSTEP是保存在终端侧 EFS文件或者非易失性 内存中用来调整回差值的一个递增量。
如图 5 所示， 是本发明实施例中频繁重选保护策略步驟示意图， 主要 包括以下步驟：
步驟 S501: 增大重选迟滞参数， 步增 RSTEP。
重选迟滞参数是由网络侧下发给终端的一个参数， 步增 RSTEP参数是 一个调节参数， 用来动态调节迟滞参数， 保存在终端非易失性内存（NV ) 或者 EFS文件中， 并且可以设置为经验值或者动态调节。 重选迟滞参数是 终端做小区重选对邻居小区排序时， 为当前服务小区信号质量增加的一个 偏差值， 相邻小区减去相同的一个偏差值， 目的是为了适当拉开当前小区 与邻居小区的信号质量， 从而当邻居小区电平在合理变化范围内时不会被 重选， 这样可以有效抑制乒乓效应， 避免频繁重选。
步驟 S502: 将驻扎次数最多的邻小区移入禁止重选小区列表， 并对邻 小区列表重排序；
排序规则按照 Ec/No或者 RSCP或者 RSSI, 同时对于 3G小区增加优 先因子 Pr, 优先因子 Pr的计算方法如下： Pr = k + 1/ ( IEc/No * RSCPI )
K为常数， 默认为 1 , 当 Ec/No 和 RSCP的乘积越小， Pr越大， 该小 区的优先系数就越高。 即信号强度和信号质量越好， 则其绝对值越小， 乘 积就越小， 则该小区越优先， 也就越有可能重选到该 3G小区。 这样的目的 是为了使得双模终端尽量保持在 3G小区， 即使 2G信号好于 3G信号时也 能尽量保持 UE在 3G小区， 提高用户体验。
步驟 S503: 执行小区重选驻扎过程。
本发明的目的是克服现有技术中的缺点， 提供一种能够更加有效的进 行小区重选操作的方法及终端， 提供更好的用户体验， 并且降低小区重选 能耗。
综上， 采用了上述的控制小区重选的方法， 移动终端记录了相邻小区 的接入信息， 使得移动终端可以在发起小区重选之前就知道目标小区是否 属于可以接入， 避免了移动终端因为目标小区被禁止或者不可接入而去解 码 BCCH信息， 降低了待机能耗， 提高了协议栈的运行效率， 同时根据无 线环境动态调整重选参数， 避免了因为小区电平频繁波动时而发生的频繁 重选问题， 提高了无线通信服务质量和用户体验。
当然， 本发明还可有多种实施方式， 在不背离本发明精神及其实质的 情况， 熟悉本领域的技术人员当可根据本发明做出各种相应的更改或变化， 但凡在本发明的精神和原则之内所作的任何修改、 等同替换、 改进， 均应 包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种控制小区重选的方法， 其特征在于， 通过记录单位时间内小区 驻扎的次数判断是否发生频繁重选， 如果发生频繁重选则启动频繁重选保 护策略， 将次优先小区记录到禁止重选小区列表， 从而使得终端尽量驻扎 在服务质量较高或者信号电平相对稳定的小区。
2、 根据权利要求 1所述的方法， 其特征在于， 所述启动频繁重选保护 策略包括增大重选迟滞参数。
3、 根据权利要求 1所述的方法， 其特征在于， 所述将将次优先小区记 录到禁止重选小区列表包括： 将驻扎次数最多的邻小区移入禁止重选小区 列表， 并对邻 ' j、区列表重排序。
4、 根据权利要求 3所述的方法， 其特征在于， 所述对邻小区列表重排 序规则按照 Ec/No或者 RSCP或者 RSSI进行， 对于 3G小区增加优先因子 Pr, 优先因子 Pr的计算方法如下：
Pr = k + 1/ ( IEc/No * RSCPI )
K为常数， 默认为 1。
5、 根据权利要求 1所述的方法， 其特征在于， 在判断是否发生频繁重 选之前还包括： 读取配置信息， 并初始化禁止重选小区列表以及成功重选 小区列表； 所述配置信息包括重选粒度阀值。
6、 根据权利要求 5所述的方法， 其特征在于， 在启动频繁重选保护策 略之前还包括：
判断重选小区是否在禁止重选小区列表；
如果重选小区不在禁止重选小区列表， 则进一步判断目标小区是否在 成功重选小区列表；
如果目标小区不在成功重选小区列表， 则进一步判断该小区的重选粒 度阈值是否大于预设值， 如果大于则启动频繁重选保护策略。
7、 一种无线通信终端， 其特征在于， 所述无线通信终端包括： 测量模 块、 自适应模块和判决模块， 其中，
所述测量模块对邻小区进行测量， 获得邻小区的网络参数， 并按照测 量结果对测量小区进行排序；
所述自适应模块收集网络侧下发的测量参数， 并根据终端的状态动态 调整测量参数；
所述判决模块按照协议执行小区重选过程。
8、 如权利要求 7所述的终端， 其特征在于， 按照协议执行小区重选过 程包括： 如果发生频繁重选则启动频繁重选保护策略， 将次优先小区记录 到禁止重选小区列表， 从而使得终端尽量驻扎在服务质量较高或者信号电 平相对稳定的小区。
9、 如权利要求 7所述的终端， 其特征在于， 所述网络参数包括以下一 种或几种： FDD或者 TDD小区的 Ec/Io或者 RSCP参数， GSM小区的 RSSI 参数。
10、 如权利要求 7所述的终端， 其特征在于， 所述按照测量结果对测 量小区进行排序包括：邻小区的排序按照 3GPP协议 TS25.304对于 FDD或 者 TDD小区按照 Ec/Io或者 RSCP进行排序， 对于 GSM小区按照 RSSI进 行小区排序。
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