WO2014134953A1 - 一种小区选择方法、装置及终端 - Google Patents
一种小区选择方法、装置及终端 Download PDFInfo
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- WO2014134953A1 WO2014134953A1 PCT/CN2013/090088 CN2013090088W WO2014134953A1 WO 2014134953 A1 WO2014134953 A1 WO 2014134953A1 CN 2013090088 W CN2013090088 W CN 2013090088W WO 2014134953 A1 WO2014134953 A1 WO 2014134953A1
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- cell
- value
- load
- load level
- cell selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
Definitions
- the present invention relates to the field of mobile communications, and in particular, to a cell selection method, apparatus, and terminal.
- LTE Long term evolution
- BACKGROUND OF THE INVENTION Long term evolution (LTE) technology as a next-generation wireless communication technology standard has greatly improved in network speed compared to the previous communication technology, but if a cell accesses too many users, it will result in Current cell users cannot experience the advantages of LTE networks very well.
- the unbalanced load distribution of the LTE cell not only reduces the network capacity but also affects the quality of service of users. The above reasons directly contributed to the birth of mobile load balancing (MLB) technology, which maximizes the total network capacity while ensuring the quality of service for users.
- MLB mobile load balancing
- the existing MLB technology is based on the base station base station sensing the load level of the neighboring cell, setting appropriate cell handover and cell selection/reselection and redirection parameters, so that the activated or idle user switches or camps from the high load cell.
- a suitable low load neighborhood or, when the current cell load is heavy, the service quality of the user with lower priority is lowered, and the service quality of the high priority user is preferentially guaranteed. That is to say, the control right of the current MLB technology is on the network side, and the terminal can only passively accept the arrangement on the network side, and cannot perform flexible operations according to the load condition of the cell.
- an object of the embodiments of the present invention is to provide a cell selection method, apparatus, and terminal, to support a terminal to perform cell selection according to a cell load condition, and improve flexibility of terminal cell selection.
- the embodiment of the present invention provides a cell selection method, where the method is used for the terminal, including: acquiring, by using at least two cells, the at least two Each of the cells has a high or low load characteristic value, and a smaller load level indicator value indicates a lower cell load; for each of the at least two cells, a cell selection priority value calculation function, and each of the cells Determining a cell selection priority value of each of the cells, where a cell selection priority value is larger, indicating that the cell selection priority is higher; A cell with the highest cell selection priority value is selected from the at least two cells as the target serving cell.
- the step of acquiring the load high and low characterization values of the at least two cells, the load level characterization of any one of the at least two cells The value is generated by: when the control signaling sent by the network side is received in the time period in which the any cell resides, determining whether the control signaling is load balancing related control signaling, and acquiring a judgment result; when the first determination result is yes, updating the load level representation value of the any cell according to the first load level representation value update policy, so that the load level of the any cell is represented by a high or low value Increase.
- the updating the load-level characterization value of the any one of the cells according to the first load-level characterization value update policy, so that the load-level characterization value of the any cell is increased includes: determining that the terminal receives the load balancing Whether the time interval of the time of the relevant control signaling is less than the preset time interval with respect to the start time interval of the time period, obtaining a second determination result; and when the second determination result is YES, according to the a load level update value update policy, updating a load high and low characterization value of the any cell, so that a load level of the any cell is increased; and when the second determination result is no, according to the second
- the load level update value update policy updates the load level indicator value of any one of the cells, so that the load level of the any cell is reduced.
- the cell selection priority value calculation function is an increasing function of the current signal strength estimation value, and/or a subtraction function of the load high and low representation values.
- the embodiment of the present invention further provides a cell selection apparatus, which is used by the terminal, and includes: an acquiring module, configured to acquire, according to a cell selection from the at least two cells, a load level representative value of each of the at least two cells The smaller the load level, the lower the value indicates the lower the cell load; the determining module is set to calculate the function according to the cell selection priority value and the load level of each cell for each of the at least two cells.
- Determining a cell selection priority value of each cell where the value of the cell selection priority is greater, indicating that the cell selection priority is higher;
- a selecting module configured to select, from the at least two cells, a cell with the highest cell selection priority value as the target serving cell.
- a load level indicator value of any one of the at least two cells is generated by: receiving a control signal sent by the network side in a time period in which the any cell camps And determining, in the control signaling, whether the load balancing related control signaling is a first determination result, and when the first determination result is yes, updating the policy according to the first load level representation value, The load high and low characterization values of any one of the cells are updated, so that the load high and low characterization values of the any one of the cells are increased.
- the updating the load-level characterization value of the any one of the cells according to the first load-level characterization value update policy, so that the load-level characterization value of the any cell is increased includes: determining that the terminal receives the load balancing Whether the time interval of the time of the relevant control signaling is less than the preset time interval with respect to the start time interval of the time period, obtaining a second determination result; and when the second determination result is YES, according to the a load level update value update policy, updating a load high and low characterization value of the any cell, so that a load level of the any cell is increased; and when the second determination result is no, according to the second
- the load level update value update policy updates the load level indicator value of any one of the cells, so that the load level of the any cell is reduced.
- the cell selection priority value calculation function is an increasing function of the current signal strength estimation value, and/or a subtraction function of the load high and low representation values.
- the embodiment of the present invention has at least the following beneficial effects: indicating a high or low cell load value by using a high and low load characteristic value, indicating a cell selection priority level by a cell selection priority value, and prioritizing the cell selection
- the gradation calculation function establishes a functional relationship between the load high and low characterization values, the current signal strength estimation value and the cell selection priority value of each cell, thereby supporting the terminal to perform cell selection according to the cell load condition, and improving the flexibility of the terminal cell selection.
- FIG. 1 is a flow chart showing the steps of a cell selection method according to an embodiment of the present invention.
- an embodiment of the present invention provides a cell selection method, including the following steps: Step 101: Perform cell in at least two cells. In the case of selecting, the load high and low characterization values of the at least two cells are obtained, and the smaller the load high and low characterization values, the lower the cell load is.
- the step 102 is, according to the cell selection, for each of the at least two cells.
- Step 103 Select, from the at least two cells, a cell with the highest cell selection priority value as the target serving cell. The method is for a terminal. It can be seen that, in the above manner, the cell load level is indicated by the load high and low characterization values, the cell selection priority value is used to indicate the cell selection priority level, and the cell selection priority value calculation function is used to characterize the load level of each cell.
- the method generates: when the control signaling sent by the network side is received in the time period in which the any cell is camped, determining whether the control signaling is load balancing related control signaling, and acquiring the first determination result When the first determination result is yes, the load level update value of the any cell is updated according to the first load level representation value update policy, so that the load level representation value of the any cell is increased.
- the load balancing related control signaling is, for example, RRC release signaling of a cell carrying a TAU (Tracking Area Update) load balancing demand cause (Load Balancing TAU Required).
- the first load high and low characterization value update policy for example: adding a load high and low characterization value of the any cell to a first preset value, the first preset value is, for example, 1; or, the load level of the any cell is high or low
- the characterization value is multiplied; and so on. Considering that the terminal leaves the cell for a long time after it stays in a certain cell, it is caused by the load balancing cause to leave the cell. If the cell is re-accessed, the network side performs load balancing related operations on the terminal.
- the method may further include: updating, according to the first load level characterization value update policy, a value of the load level of the any cell, so that the load level of the any cell is increased, the method includes: determining that the terminal receives Whether the time interval of the load balancing related control signaling is less than the preset time interval with respect to the start time interval of the time period, and obtaining a second determination result; when the second determination result is yes, And updating, according to the first load high and low characterization value update policy, a load high and low characterization value of the any cell, so that a load high and low characterization value of the any cell is increased; and when the second determining result is no And updating, according to the second load level characterization value update policy, a load high level and low characterization value of the any one of the cells, so that a load high and low characterization value of the any one of the cells is decreased.
- the preset time interval is, for example, selected within a range of 30 minutes to 1 hour.
- the second load level representation value update policy is, for example: reducing the load level representation value of the any cell by a second preset value, the second preset value is, for example, 1, and the second preset value may be compared with the first preset
- the values are the same or different; or, the value of the load level of any of the cells is reduced to zero;
- the cell selection priority value calculation function may be an increasing function of the current signal strength estimation value, and/or a subtraction function of the load high and low characterization values.
- the cell selection priority value calculation function is an increasing function of the current signal strength estimation value: when the value of the parameter other than the current signal strength estimation value and the independent variable are unchanged, The value of the function increases as the current signal strength estimate increases. This facilitates compatibility with existing cell selection mechanisms.
- the subtraction function of the cell selection priority value calculation function as the load high and low characterization value refers to: the value of the function in the case where the value of the function other than the load high and low characterization values and the value of the independent variable are unchanged. It increases as the value of the load is reduced.
- the terminal selects the smallest cell in the load high and low characterization values as the target serving cell, which increases the possibility that the terminal selects to the low load cell, thereby reducing the possibility.
- the terminal is subject to the possibility of priority reduction, handover, cell selection/reselection or redirection due to the high cell load selected for access.
- the preferred embodiment provides a terminal and method for accessing a network according to a network load condition, and implements an access network method and technology according to a network condition. Specifically, the preferred embodiment provides a terminal and method related to load balancing in an LTE network.
- the preferred embodiment provides a method for a terminal to record whether a cell is a high-load cell: when a terminal user works under a certain LTE network cell, if the cell is overloaded If the current terminal service quality is lowered, or the current terminal is transferred to another cell by operations such as reselection, handover, redirection, etc., the terminal marks the current cell as a high load cell.
- the preferred embodiment provides a method for the mobile terminal to perform cell selection according to the LTE network condition: when the terminal user accesses the cell or is ready to perform operations such as reselection, handover, and redirection, whether the target cell is a high-load cell or not A standard chosen, preferring cells with good signal strength and non-high load.
- a method for whether a current serving cell is a high-load cell record is provided, including that the terminal may determine whether the current cell is too high in a certain time and according to the current cell camp time. I feel that the current cell is recorded as a high load cell.
- the recording for whether the current cell is overloaded may include detecting a load balancing cause, and recording and determining a cell camp time.
- Whether the cell is overloaded for detecting may include whether the terminal receives the load balancing related signaling (for example, when the terminal releases from the current cell RRC link, the cause of the RRC release is Load Balancing TAU Required), and according to the storage unit, The value of the timer T determines whether the current cell is recorded as a load balancing cell.
- the recording as the load balancing cell may include the terminal receiving the load balancing related signaling, and if the current cell camp time is less than a certain time, recording the current cell as a load balancing cell, and adding the ⁇ value in the storage unit to 1.
- the storage unit may include a timer storage unit and a load balancing storage unit.
- the timer storage unit uses a record to record the time when the terminal operates in the current cell.
- the load balancing storage unit is configured to record the number of times the terminal performs load balancing in the cell.
- a method for determining whether to access the cell according to a network load condition including: the terminal sorts the cells existing in the current network according to certain criteria, and selects an optimal cell for access. .
- the sorting of the cells according to a certain criterion may include the terminal detecting the signal strength of the current network cell (including but not limited to the detection of the RSRP value), sorting the S values of the detected cells, and selecting the optimal cell for registration.
- the load balancing offset value may be an offset value calculated according to the load balancing number n (eg,
- the load balancing times of a certain cell may be the total number of times that the load balancing related signaling is received in the cell within a certain period of time, or may be a certain time, after receiving the load balancing related signaling after each time accessing the cell, If the load is balanced If the time interval between the receiving time of the relevant signaling and the time of accessing the cell is less than the set time interval, the load balancing time is increased by a certain set value; otherwise, the load balancing number is subtracted from a certain setting value or cleared. zero.
- the load balancing reason recorded by the terminal in the working process includes, but is not limited to, RRC released.
- the relationship between the load balancing offsets Mmlb and n is not limited to a linear proportional relationship, and may be finely adjusted according to the actual situation of the network. Referring to Figure 2, the preferred embodiment will be described in more detail below by providing a preferred embodiment of the preferred embodiment:
- the network search is performed, the searched cells are sorted according to the extended S criterion, the largest cell of Srxlevl is selected for registration, the timer T is started, and the service is used.
- the network side sends an RRC release message to the UE to indicate that the UE performs RRC link release.
- the UE determines whether the RRC link release indicated by the RRC release message is initiated due to load balancing reasons, that is, whether the RRC release message is detected.
- the timer duration of the timer is less than a set value (eg, one hour), and if it is less than the set value, The value of n in the storage unit is increased by 1; if it is not less than the set value, the control timer stops counting and sets the chronograph time to zero, and clears the value of n in the corresponding storage unit of the current cell. Then, the UE completes the RRC link release action according to the RRC release message, redirects to other cells or maintains the RRC idle state or performs cell selection again according to the extended S criterion.
- a set value eg, one hour
- the existing MLB technology is based on the base station base station sensing the load level of the neighboring cell, setting appropriate cell handover and cell selection/reselection and redirection parameters, so that the activated or idle user switches or camps from the high load cell.
- a suitable low load neighborhood or, when the current cell load is heavy, the service quality of the user with lower priority is lowered, and the service quality of the high priority user is preferentially guaranteed.
- an object of the preferred embodiment is to provide a specific method for a mobile terminal to actively select a cell according to a network load condition: The terminal records whether a cell has been degraded or changed/redirected due to load balancing reasons.
- the embodiment of the present invention further provides a cell selection apparatus, including: an obtaining module, configured to acquire, according to a cell selection from at least two cells, a load high and low characterization value of the at least two cells, where a higher and lower characterization value The small indicates that the cell load is lower; the determining module is configured to calculate a function according to the cell selection priority value, and a load level representative value and a current signal strength estimate of each of the at least two cells according to the cell selection priority value a value, the cell selection priority value of each cell is determined, where a cell selection priority value is larger, indicating that a cell selection priority is higher; and a selecting module is configured to select a cell selection priority from the at least two cells The cell with the largest value is used as the target serving cell.
- an obtaining module configured to acquire, according to a cell selection from at least two cells, a load high and low characterization value of the at least two cells, where a higher and lower characterization value The small indicates that the cell load is lower
- the determining module is configured
- the device is for a terminal. It can be seen that, in the above manner, the cell load level is indicated by the load high and low characterization values, the cell selection priority value is used to indicate the cell selection priority level, and the cell selection priority value calculation function is used to characterize the load level of each cell.
- the value, the current signal strength estimation value and the cell selection priority value establish a functional relationship, thereby supporting the terminal to perform cell selection according to the cell load condition, thereby improving the flexibility of the terminal cell selection.
- the value of the load level of any one of the at least two cells is generated by: when receiving the control signaling sent by the network side in the time period in which the any cell resides, Determining whether the control signaling is load balancing related control signaling, and obtaining a first determination result; when the first determination result is yes, updating the any of the cells according to the first load level representation value update policy
- the load high and low characterization values increase the load level of the any cell.
- the determining, according to the first load level characterization value update policy, the load high and low characterization value of the any cell, so that the load level of the any cell is increased may include: determining that the terminal receives the load balancing Whether the time interval of the relevant control signaling is less than the preset time interval with respect to the start time interval of the time period, obtaining a second determination result; when the second determination result is YES, according to the first load And a high or low characterization value update policy, updating a load high and low characterization value of the any cell, so that a load high and low characterization value of the any cell is increased; and when the second determining result is no, according to a second load high characterization value And updating the policy, updating the load level indicator value of any one of the cells, so that the load level of the any cell is reduced.
- the cell selection priority value calculation function may be an increasing function of the current signal strength estimate, and/or a subtraction function of the load level representation value.
- the embodiment of the invention further provides a terminal, where the terminal includes the cell selection device described above.
- the terminal is, for example, an LTE UE.
- the technical solution provided by the embodiments of the present invention can be applied to the field of mobile communications, indicating a high or low load value of a load, indicating a priority of a cell selection by a cell selection priority value, and prioritizing the cell selection.
- Level value calculation function to estimate the load level and current signal strength of each cell The value establishes a functional relationship with the cell selection priority value, thereby supporting the terminal to perform cell selection according to the cell load condition, thereby improving the flexibility of the terminal cell selection.
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Abstract
本发明实施例提供一种小区选择方法、装置及终端。方法包括:在从至少两个小区中进行小区选择的情况下,获取所述至少两个小区各自的负载高低表征值,负载高低表征值越小表明小区负载越低;对所述至少两个小区中的每个小区,根据小区选择优先级值计算函数、和所述每个小区的负载高低表征值和当前信号强度估计值,确定所述每个小区的小区选择优先级值,其中,小区选择优先级值越大表明小区选择优先级越高;从所述至少两个小区中选择小区选择优先级值最大的小区作为目标服务小区。本发明实施例提高了终端小区选择的灵活性。
Description
一种小区选择方法、 装置及终端 技术领域 本发明涉及移动通讯领域, 尤其涉及一种小区选择方法、 装置及终端。 背景技术 长期演进 (Long term evolution, 简称为 LTE) 技术作为下一代无线通信技术标准 在网络速度上相对于以往的通信技术有了很大的提高, 但是如果一个小区接入用户过 多就会导致当前小区用户不能很好的体验 LTE网络的优势。 LTE 小区负载分布不均衡 的现象, 不仅会降低网络容量而且还会影响到用户的服务质量。 上述原因直接促使了 移动负载均衡 (MLB) 技术的诞生, 在保证用户的服务质量的同时, 使网络总容量达 到最大化。 目前现有的 MLB 技术是小区基站在感知邻近小区的负载水平的基础上, 设置适 当的小区切换和小区选择 /重选以及重定向参数, 使激活或空闲用户从高负载小区切换 或驻留到合适的低负载邻区。 或者在当前小区负载较重时, 降低优先级较低的用户的 服务质量, 优先保证高优先级用户服务质量。 也就是说, 目前的 MLB 技术的控制权 在网络侧, 终端只能被动接受网络侧的安排, 无法根据小区负载状况进行灵活操作。 发明内容 有鉴于此, 本发明实施例的目的是提供一种小区选择方法、 装置及终端, 以支持 终端根据小区负载状况进行小区选择, 提高终端小区选择的灵活性。 为解决上述技术问题, 本发明实施例提供方案如下: 本发明实施例提供一种小区选择方法, 用于终端, 包括: 在从至少两个小区中进行小区选择的情况下, 获取所述至少两个小区各自的负载 高低表征值, 负载高低表征值越小表明小区负载越低; 对所述至少两个小区中的每个小区, 根据小区选择优先级值计算函数、 和所述每 个小区的负载高低表征值和当前信号强度估计值, 确定所述每个小区的小区选择优先 级值, 其中, 小区选择优先级值越大表明小区选择优先级越高;
从所述至少两个小区中选择小区选择优先级值最大的小区作为目标服务小区。 优选地, 对于所述在从至少两个小区中进行小区选择的情况下, 获取所述至少两 个小区各自的负载高低表征值的步骤, 所述至少两个小区中任一小区的负载高低表征 值通过如下方式生成: 在所述任一小区驻留的时间段内接收到网络侧下发的控制信令的情况下, 判断所 述控制信令中是否为负载均衡相关控制信令, 获取第一判断结果; 当所述第一判断结果为是的情况下, 根据第一负载高低表征值更新策略, 更新所 述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大。 优选地, 所述根据第一负载高低表征值更新策略, 更新所述任一小区的负载高低 表征值, 使得所述任一小区的负载高低表征值增大包括: 判断终端接收到所述负载均衡相关控制信令的时间相对于所述时间段的起始时间 的延迟时间间隔是否小于预设时间间隔, 获取第二判断结果; 当所述第二判断结果为是的情况下, 根据所述第一负载高低表征值更新策略, 更 新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大; 当所述第二判断结果为否的情况下, 根据第二负载高低表征值更新策略, 更新所 述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值减小。 优选地, 所述小区选择优先级值计算函数为当前信号强度估计值的增函数, 和 / 或, 负载高低表征值的减函数。 优选地,所述小区选择优先级值计算函数为: 小区选择优先级值 =当前信号强度估 计值-负载高低表征值 X预设系数。 本发明实施例还提供一种小区选择装置, 用于终端, 包括: 获取模块, 设置为在从至少两个小区中进行小区选择的情况下, 获取所述至少两 个小区各自的负载高低表征值, 负载高低表征值越小表明小区负载越低; 确定模块, 设置为对所述至少两个小区中的每个小区, 根据小区选择优先级值计 算函数、 和所述每个小区的负载高低表征值和当前信号强度估计值, 确定所述每个小 区的小区选择优先级值, 其中, 小区选择优先级值越大表明小区选择优先级越高;
选择模块, 设置为从所述至少两个小区中选择小区选择优先级值最大的小区作为 目标服务小区。 优选地, 对于所述获取模块, 所述至少两个小区中任一小区的负载高低表征值通 过如下方式生成: 在所述任一小区驻留的时间段内接收到网络侧下发的控制信令的情况下, 判断所 述控制信令中是否为负载均衡相关控制信令, 获取第一判断结果; 当所述第一判断结果为是的情况下, 根据第一负载高低表征值更新策略, 更新所 述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大。 优选地, 所述根据第一负载高低表征值更新策略, 更新所述任一小区的负载高低 表征值, 使得所述任一小区的负载高低表征值增大包括: 判断终端接收到所述负载均衡相关控制信令的时间相对于所述时间段的起始时间 的延迟时间间隔是否小于预设时间间隔, 获取第二判断结果; 当所述第二判断结果为是的情况下, 根据所述第一负载高低表征值更新策略, 更 新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大; 当所述第二判断结果为否的情况下, 根据第二负载高低表征值更新策略, 更新所 述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值减小。 优选地, 所述小区选择优先级值计算函数为当前信号强度估计值的增函数, 和 / 或, 负载高低表征值的减函数。 优选地,所述小区选择优先级值计算函数为: 小区选择优先级值 =当前信号强度估 计值-负载高低表征值 X预设系数。 本发明实施例还提供一种包括以上所述的小区选择装置的终端。 从以上所述可以看出, 本发明实施例至少具有如下有益效果: 通过负载高低表征值来表明小区负载高低状况, 通过小区选择优先级值来表明小 区选择优先级高低状况, 并通过小区选择优先级值计算函数来为各个小区的负载高低 表征值、 当前信号强度估计值和小区选择优先级值建立函数关系, 从而支持了终端根 据小区负载状况进行小区选择, 提高了终端小区选择的灵活性。
附图说明 图 1表示本发明实施例提供的一种小区选择方法的步骤流程图; 图 2表示本发明实施例的较佳实施方式的一个优先实施例的流程示意图; 图 3表示本发明实施例的较佳实施方式的一个优先实施例的排序示意图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合附图及具体实 施例对本发明实施例进行详细描述。 图 1表示本发明实施例提供的一种小区选择方法的步骤流程图, 参照图 1, 本发 明实施例提供一种小区选择方法, 包括如下步骤: 步骤 101, 在从至少两个小区中进行小区选择的情况下, 获取所述至少两个小区 各自的负载高低表征值, 负载高低表征值越小表明小区负载越低; 步骤 102, 对所述至少两个小区中的每个小区, 根据小区选择优先级值计算函数、 和所述每个小区的负载高低表征值和当前信号强度估计值, 确定所述每个小区的小区 选择优先级值, 其中, 小区选择优先级值越大表明小区选择优先级越高; 步骤 103, 从所述至少两个小区中选择小区选择优先级值最大的小区作为目标服 务小区。 所述方法用于终端。 可见, 通过上述方式, 通过负载高低表征值来表明小区负载高低状况, 通过小区 选择优先级值来表明小区选择优先级高低状况, 并通过小区选择优先级值计算函数来 为各个小区的负载高低表征值、 当前信号强度估计值和小区选择优先级值建立函数关 系, 从而支持了终端根据小区负载状况进行小区选择,提高了终端小区选择的灵活性。 其中,当前信号强度估计值例如:当前信号强度估计值 =当前 RSRP值 QralCTmi;as- (当 前 RSRP的最小接收强度 QralCTmm+当前 RSRP的最小接收强度的偏置值 QrxlCTmm。ffsi;t)- 补偿值 Pcompensation。 在本发明实施例中, 可以有:
对于所述在从至少两个小区中进行小区选择的情况下, 获取所述至少两个小区各 自的负载高低表征值的步骤, 所述至少两个小区中任一小区的负载高低表征值通过如 下方式生成: 在所述任一小区驻留的时间段内接收到网络侧下发的控制信令的情况下, 判断所 述控制信令中是否为负载均衡相关控制信令, 获取第一判断结果; 当所述第一判断结果为是的情况下, 根据第一负载高低表征值更新策略, 更新所 述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大。 其中,负载均衡相关控制信令例如:携带 TAU (跟踪域更新, Tracking Area Update) 负载均衡需求原因 (Load Balancing TAU Required) 信元的 RRC释放 (RRCrelease) 信令。 所述第一负载高低表征值更新策略例如: 将所述任一小区的负载高低表征值增加 一第一预设值, 第一预设值例如 1 ; 或者, 将所述任一小区的负载高低表征值成倍增 加; 等等。 考虑到对于终端在某小区驻留较长时间后才离开的情况, 被因负载均衡原因而促 使离开该小区属于偶发情况, 如果重新接入该小区, 则网络侧针对该终端进行负载均 衡相关操作的可能性较小, 从而该终端仍然可能获得较好的服务。有鉴于此, 可以有: 所述根据第一负载高低表征值更新策略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大包括: 判断终端接收到所述负载均衡相关控制信令的时间相对于所述时间段的起始时间 的延迟时间间隔是否小于预设时间间隔, 获取第二判断结果; 当所述第二判断结果为是的情况下, 根据所述第一负载高低表征值更新策略, 更 新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大; 当所述第二判断结果为否的情况下, 根据第二负载高低表征值更新策略, 更新所 述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值减小。 所述预设时间间隔例如: 在 30分钟〜 1小时的范围内选取。 所述第二负载高低表征值更新策略例如: 将所述任一小区的负载高低表征值减少 一第二预设值, 第二预设值例如 1, 第二预设值可以与第一预设值相同或不同; 或者, 将所述任一小区的负载高低表征值减小到零; 等等。
在本发明实施例中, 所述小区选择优先级值计算函数可以为当前信号强度估计值 的增函数, 和 /或, 负载高低表征值的减函数。 这里, 所述小区选择优先级值计算函数为当前信号强度估计值的增函数是指: 在 该函数除当前信号强度估计值之外的其它参数及自变量的取值不变的情况下, 该函数 的取值随着当前信号强度估计值的增大而增大。 这样有利于与现有小区选择机制保持 兼容性。 所述小区选择优先级值计算函数为负载高低表征值的减函数是指: 在该函数除负 载高低表征值之外的其它参数及自变量的取值不变的情况下, 该函数的取值随着负载 高低表征值的减小而增大。 这样, 在所述至少两个小区各自的当前信号强度估计值均 相同时, 终端选择负载高低表征值中最小的小区作为目标服务小区, 增加了终端选择 到低负载小区的可能性,从而减少了终端因选择接入的小区负载高而遭到优先级降低、 切换、 小区选择 /重选或重定向的可能性。 其中, 所述小区选择优先级值计算函数例如, 可以为: 小区选择优先级值 =当前信 号强度估计值-当前负载高低表征值 X预设系数。 当然, 本领域技术人员也应该明白, 只要能满足"所述小区选择优先级值计算函数为当前信号强度估计值的增函数, 和 /或, 负载高低表征值的减函数"的限定的小区选择优先级值计算函数都是可以的。 为将本发明实施例阐述得更加清楚明白,下面提供本发明实施例的较佳实施方式。 本较佳实施方式提供一种根据网络负载情况进行接入网络的终端和方法, 实现根 据网络情况进行接入网络方法和技术。 具体的说, 本较佳实施方式提供的是一种涉及 LTE网络中负载均衡的终端和方法。 对本较佳实施方式的总体描述如下: 本较佳实施方式提供一种终端记录某个小区是否为高负载小区的方法: 终端用户工作在某个 LTE网络小区下时, 如果由于小区负载过重而降低当前终端 服务质量、 或通过重选、 切换、 重定向等操作将当前终端转移到其它小区, 则终端将 当前小区标记为高负载小区。 本较佳实施方式提供一种移动终端根据 LTE网络情况进行小区选择的方法: 终端用户在接入小区或准备进行重选、 切换、 重定向等操作时, 将目标小区是否 为高负载小区作为小区选择的一个标准, 优先选择信号强度好并且非高负载小区。
根据本较佳实施方式的一个方面, 提供了一种对于当前服务小区是否为高负载小 区记录的方法, 包括终端可以对于当前小区某一时间内是否负载过高进行判定并根据 当前小区驻留时间觉得是否将当前小区记录为高负载小区。 其中, 所述对于当前小区是否负载过高进行记录可以包括对于负载均衡原因进行 检测, 对于小区驻留时间进行记录及判定。 所述小区是否负载过高进行检测可以包括终端是否接收到负载均衡相关信令(如, 当终端从当前小区 RRC 链接释放时, RRCrelease 的原因值为 Load Balancing TAU Required), 并根据存储单元中的计时器 T的值来判定是否将当前小区记录为负载均衡 小区。 所述记录为负载均衡小区可以包括终端接收到负载均衡相关信令并且在当前小区 驻留时间小于一定时间, 则记录当前小区为负载均衡小区, 将存储单元中 η值加 1。 所述存储单元可以包括计时器存储单元及负载均衡存储单元, 计时器存储单元用 例记录终端在当前小区工作的时间; 负载均衡存储单元用于记录终端在该小区发生负 载均衡的次数。 根据本较佳实施方式的一个方面, 提供了一种根据网络负载情况决定是否接入该 小区的方法, 包括终端对于当前网络中存在的小区按照一定准则进行排序, 并选择最 优小区进行接入。 其中, 所述小区按照一定准则排序可以包括终端对于当前网络小区的信号强度进 行检测(包括但不限于 RSRP值的检测), 将检测到的小区的 S值进行排序, 选择最优 小区进行注册。 所述小区排序准则包括扩展的 S 准则, 原有的 S 准则为: Srxlev = QralCTmi;as -
(Qrxlevmm + Qrxlevmmoffset) - PcOmpenSatlOn , 即为终端检测到的测量小区 RSRP值减去小 区中 RSRP的最小接收强度加上并减去一个偏置值。所述的扩展 S准则可以为: Srxlevl = Srxlev -Mmlb, 即在最初 S准则上减去一个负载均衡偏置值。 所述负载均衡偏置值可以为根据负载均衡次数 n 计算得出的偏置值 (如
Mmlb=0.05n, 这里, 0.05 为预设系数的一个例子, 具体系数可微调)。 其中, 某小区 的负载均衡次数可以为一定时间内在该小区接收到负载均衡相关信令的总次数, 也可 以为一定时间内, 每次接入该小区后, 接收到负载均衡相关信令时, 如果该负载均衡
相关信令的接收时间与该次接入该小区的时间的时间间隔小于设定时间间隔, 则将负 载均衡次数增加某个设定值; 否则将负载均衡次数减去某个设定值或清零。 所述小区排序准则可以包括,对于当前环境小区的 S值 Srxlevl进行排序,小区 A 的扩展 S准则 SrxlevlA=SrxlevA-Mmlb, 小区 B的扩展 S准则 SrxlevlB=SrxlevB, 在 进行选择时, 需要判定 SrxlevlA与 rxlevlB的大小, 选择大的小区进行接入。 进一步地, 终端在工作过程中所记录的负载均衡原因包括但不限于 RRC released, 所述负载均衡偏置 Mmlb与 n之间的关系不限于线性正比关系, 具体可以根据网络实 际情况微调。 参照图 2, 下面通过提供本较佳实施方式的一个优选实施例, 来对本较佳实施方 式做更为具体的说明:
UE开机后, 进行网络搜索, 对搜索到的小区按照扩展的 S准则进行排序, 选择 Srxlevl最大的小区进行注册、 启动计时器 T记时、 并进行业务使用。 在用户使用过程中网络侧向 UE下发 RRCrelease消息,指示 UE进行 RRC链接释 放; UE收到 RRCrelease消息后, 判定 RRCrelease消息指示的 RRC链接释放是否由 于负载均衡原因而发起, 即检测 RRCrelease 消息中是否携带 Load Balancing TAU Required信元, 如果 RRCrelease消息指示的 RRC链接释放是由于负载均衡原因而发 起, 则判断计时器的记时时长是否小于设定值(如一小时), 如果小于设定值, 则将存 储单元中 n值增加 1 ; 如果不小于设定值, 则控制计时器停止记时并将记时时间置零, 并将当前所在小区对应存储单元中 n值清零。 然后, UE根据 RRCrelease消息完成 RRC链接释放动作, 重定向到其它小区或保 持 RRC空闲状态或者重新按照扩展 S准则进行小区选择。 如果 UE后续接入到某小区时, 则控制计时器从零开始重新记时。 从图 3可以直观地看出, 使用本较佳实施方式提供的扩展的 S准则进行小区排序 及小区选择, 当小区 A的 SrxlevA高于小区 B的 SrxlevB, 但是小区 A有较高负载如 100个, 终端曾在小区 A发生过多次负载均衡如 n=2, 而小区 B有 10个负载并未发生 过负载均衡, 则扩展的 S准则 SrxlevlA小于 SrxlevlB, 则终端可以正确识别小区 B 更能保证用户的服务质量而选择注册到小区 B。
目前现有的 MLB 技术是小区基站在感知邻近小区的负载水平的基础上, 设置适 当的小区切换和小区选择 /重选以及重定向参数, 使激活或空闲用户从高负载小区切换 或驻留到合适的低负载邻区。 或者在当前小区负载较重时, 降低优先级较低的用户的 服务质量, 优先保证高优先级用户服务质量。 上述过程完全由基站网络侧决定, 终端 没有主动权, 也就是说终端在接入一个小区之前不知道当前网络是否负载过重, 也就 不知道自己的服务质量是否能被保证; 另外, 由于负载均衡导致小区之间的切换、 重 定向等动作需要不同小区间交换负载信, 协调参数等, 也会增加网络的信令开销。 鉴于上述问题, 本较佳实施方式的目的是提供一种移动终端主动根据网络负载情 况选择小区的具体方法: 终端记录在某个小区是否曾经因为负载均衡原因而被降低服 务质量或切换 /重定向到其它小区, 若有则将当前小区记录为负载多小区; 当终端接准备入小区时, 除了根据小区信号强度等情况进行小区选择外,还将小 区是否为负载多小区作为一个衡量参数; 优先选择信号相对较好, 负载不高的小区进 而满足用户高质量的业务需求; 避免多个用户同时接入同一个高信号小区而用户业务 需求不能被保证, 提高用户体验。 本发明实施例还提供一种小区选择装置, 包括: 获取模块, 设置为在从至少两个小区中进行小区选择时, 获取所述至少两个小区 各自的负载高低表征值, 负载高低表征值越小表明小区负载越低; 确定模块, 设置为对所述至少两个小区中的每个小区, 根据小区选择优先级值计 算函数、 和所述每个小区的负载高低表征值和当前信号强度估计值, 确定所述每个小 区的小区选择优先级值, 其中, 小区选择优先级值越大表明小区选择优先级越高; 选择模块, 设置为从所述至少两个小区中选择小区选择优先级值最大的小区作为 目标服务小区。 所述装置用于终端。 可见, 通过上述方式, 通过负载高低表征值来表明小区负载高低状况, 通过小区 选择优先级值来表明小区选择优先级高低状况, 并通过小区选择优先级值计算函数来 为各个小区的负载高低表征值、 当前信号强度估计值和小区选择优先级值建立函数关 系, 从而支持了终端根据小区负载状况进行小区选择,提高了终端小区选择的灵活性。 其中, 可以有:
对于所述获取模块, 所述至少两个小区中任一小区的负载高低表征值通过如下方 式生成: 在所述任一小区驻留的时间段内接收到网络侧下发的控制信令时, 判断所述控制 信令中是否为负载均衡相关控制信令, 获取第一判断结果; 当所述第一判断结果为是时, 根据第一负载高低表征值更新策略, 更新所述任一 小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大。 其中, 所述根据第一负载高低表征值更新策略, 更新所述任一小区的负载高低表 征值, 使得所述任一小区的负载高低表征值增大可以包括: 判断终端接收到所述负载均衡相关控制信令的时间相对于所述时间段的起始时间 的延迟时间间隔是否小于预设时间间隔, 获取第二判断结果; 当所述第二判断结果为是时, 根据所述第一负载高低表征值更新策略, 更新所述 任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大; 当所述第二判断结果为否时, 根据第二负载高低表征值更新策略, 更新所述任一 小区的负载高低表征值, 使得所述任一小区的负载高低表征值减小。 此外, 所述小区选择优先级值计算函数可以为当前信号强度估计值的增函数, 和 / 或, 负载高低表征值的减函数。 其中,所述小区选择优先级值计算函数可以为: 小区选择优先级值 =当前信号强度 估计值-负载高低表征值 X预设系数。 本发明实施例还提供一种终端, 所述终端包括以上所述的小区选择装置。 所述终 端例如: LTE UE。 以上所述仅是本发明实施例的实施方式, 应当指出, 对于本技术领域的普通技术 人员来说, 在不脱离本发明实施例原理的前提下, 还可以作出若干改进和润饰, 这些 改进和润饰也应视为本发明实施例的保护范围。 工业实用性 本发明实施例提供的技术方案可以应用于移动通讯领域, 通过负载高低表征值来 表明小区负载高低状况, 通过小区选择优先级值来表明小区选择优先级高低状况, 并 通过小区选择优先级值计算函数来为各个小区的负载高低表征值、 当前信号强度估计
值和小区选择优先级值建立函数关系, 从而支持了终端根据小区负载状况进行小区选 择, 提高了终端小区选择的灵活性。
Claims
1. 一种小区选择方法, 用于终端, 包括:
在从至少两个小区中进行小区选择的情况下, 获取所述至少两个小区各自 的负载高低表征值, 负载高低表征值越小表明小区负载越低;
对所述至少两个小区中的每个小区, 根据小区选择优先级值计算函数、 和 所述每个小区的负载高低表征值和当前信号强度估计值, 确定所述每个小区的 小区选择优先级值, 其中, 小区选择优先级值越大表明小区选择优先级越高; 从所述至少两个小区中选择小区选择优先级值最大的小区作为目标服务小 区。
2. 如权利要求 1所述的方法, 其中, 对于所述在从至少两个小区中进行小区选择 的情况下, 获取所述至少两个小区各自的负载高低表征值的步骤, 所述至少两 个小区中任一小区的负载高低表征值通过如下方式生成:
在所述任一小区驻留的时间段内接收到网络侧下发的控制信令的情况下, 判断所述控制信令中是否为负载均衡相关控制信令, 获取第一判断结果; 当所述第一判断结果为是的情况下, 根据第一负载高低表征值更新策略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增 大。
3. 如权利要求 2所述的方法, 其中, 所述根据第一负载高低表征值更新策略, 更 新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大 包括:
判断终端接收到所述负载均衡相关控制信令的时间相对于所述时间段的起 始时间的延迟时间间隔是否小于预设时间间隔, 获取第二判断结果;
当所述第二判断结果为是的情况下, 根据所述第一负载高低表征值更新策 略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征 值增大;
当所述第二判断结果为否的情况下, 根据第二负载高低表征值更新策略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值减 小。
4. 如权利要求 1所述的方法, 其中, 所述小区选择优先级值计算函数为当前信号 强度估计值的增函数, 和 /或, 负载高低表征值的减函数。
5. 如权利要求 4所述的方法, 其中, 所述小区选择优先级值计算函数为: 小区选 择优先级值 =当前信号强度估计值-负载高低表征值 X预设系数。
6. 一种小区选择装置, 用于终端, 包括:
获取模块, 设置为在从至少两个小区中进行小区选择的情况下, 获取所述 至少两个小区各自的负载高低表征值,负载高低表征值越小表明小区负载越低; 确定模块, 设置为对所述至少两个小区中的每个小区, 根据小区选择优先 级值计算函数、 和所述每个小区的负载高低表征值和当前信号强度估计值, 确 定所述每个小区的小区选择优先级值, 其中, 小区选择优先级值越大表明小区 选择优先级越高;
选择模块, 设置为从所述至少两个小区中选择小区选择优先级值最大的小 区作为目标服务小区。
7. 如权利要求 6所述的装置, 其中, 对于所述获取模块, 所述至少两个小区中任 一小区的负载高低表征值通过如下方式生成:
在所述任一小区驻留的时间段内接收到网络侧下发的控制信令的情况下, 判断所述控制信令中是否为负载均衡相关控制信令, 获取第一判断结果;
当所述第一判断结果为是的情况下, 根据第一负载高低表征值更新策略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增 大。
8. 如权利要求 7所述的装置, 其中, 所述根据第一负载高低表征值更新策略, 更 新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值增大 包括:
判断终端接收到所述负载均衡相关控制信令的时间相对于所述时间段的起 始时间的延迟时间间隔是否小于预设时间间隔, 获取第二判断结果;
当所述第二判断结果为是的情况下, 根据所述第一负载高低表征值更新策 略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征 值增大;
当所述第二判断结果为否的情况下, 根据第二负载高低表征值更新策略, 更新所述任一小区的负载高低表征值, 使得所述任一小区的负载高低表征值减 小。
9. 如权利要求 6所述的装置, 其中, 所述小区选择优先级值计算函数为当前信号 强度估计值的增函数, 和 /或, 负载高低表征值的减函数。
10. 如权利要求 9所述的装置, 其中, 所述小区选择优先级值计算函数为: 小区选 择优先级值 =当前信号强度估计值-负载高低表征值 X预设系数。
11. 一种终端, 包括如权利要求 6至 10中任一权利要求所述的小区选择装置。
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CN102905317A (zh) * | 2012-10-25 | 2013-01-30 | 西安电子科技大学 | 一种应用于多小区的移动性负载均衡方法 |
CN103188734A (zh) * | 2013-04-03 | 2013-07-03 | 华信邮电咨询设计研究院有限公司 | 基于多因素决策的lte小区切换方法 |
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CN111556533A (zh) * | 2020-05-15 | 2020-08-18 | Oppo广东移动通信有限公司 | 一种小区驻留控制方法及相关设备 |
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