WO2012155754A1 - 下行静态icic的判别方法及基站 - Google Patents

下行静态icic的判别方法及基站 Download PDF

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Publication number
WO2012155754A1
WO2012155754A1 PCT/CN2012/074307 CN2012074307W WO2012155754A1 WO 2012155754 A1 WO2012155754 A1 WO 2012155754A1 CN 2012074307 W CN2012074307 W CN 2012074307W WO 2012155754 A1 WO2012155754 A1 WO 2012155754A1
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cell
signal strength
terminal
threshold
absolute
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PCT/CN2012/074307
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English (en)
French (fr)
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姬舒平
赵黎波
赵毅
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中兴通讯股份有限公司
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Publication of WO2012155754A1 publication Critical patent/WO2012155754A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • 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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a downlink static ICIC (Internal Cell Interference Coordination) method and a base station.
  • ICIC Internal Cell Interference Coordination
  • the inter-cell interference coordination technology ICIC in the TDD-LTE (Time Division Duplexing-Long Term Evolution) system includes static ICIC, semi-static ICIC and dynamic ICIC technology.
  • ICIC is implemented through user scheduling and power allocation. Considering that the cell center user and the edge user are in different channel environments, the same-frequency interference from the neighboring cell is different, and the impact on the user traffic is different. Therefore, by determining the location of the user in the cell, the user in the cell is classified as Two sets of cell center users and cell edge users.
  • the system adopts different strategies for the cell center user and the cell edge user in frequency scheduling and power allocation to reduce the co-channel interference of the cell edge users, that is, improve the channel quality of the edge users, improve the throughput of the edge users, and further improve the edge.
  • the main purpose of ICIC is to improve the throughput of all users in the community by increasing the throughput and user experience of edge users. Since semi-static ICIC and dynamic ICIC involve many interactive information, complex algorithms and other factors, it has not been realized and verified yet, and the static ICIC algorithm has been implemented and verified.
  • the basic idea is "band offset + power allocation".
  • the frequency band is staggered, which means that the collision between the "edge band” and the “edge band” caused by random frequency allocation between adjacent cells is shifted into “edge band” and "center band” collision.
  • the interference of the users at the edge of the whole network is very large, causing the "edge band” and the "central band” to collide, and at the same time assisting the power allocation strategy, simply "the center is low.”
  • Power, edge High power can effectively improve the SINR (Signal to Interference plus Noise Ratio) of edge users and improve the traffic of edge users.
  • the transmit power of the center user is reduced, and if The collision with the edge user of the other party's increased power increases the interference, so the overall user's SINR or MCS (Modulation and Coding Scheme) level will decrease.
  • SINR or MCS Modulation and Coding Scheme
  • the base station can dynamically schedule the frequency resources and power of the central user and the edge user according to the allocated frequency band combined with the scheduling algorithm.
  • a key technology of the downlink static ICIC is how to define the cell center user and the edge user, that is, how to divide the users in the cell into cell center users and cell edge users.
  • the current algorithm is to measure the A3 event of the ICIC sent by the base station to the terminal, and determine the location attribute of the UE, that is, the cell center or the cell edge, by using the relative threshold method in the ICIC-based A3 measurement 4 report on the UE.
  • the scheduler is then notified to perform frequency and power allocation.
  • the event is to determine whether the terminal is at the cell edge or the cell center by comparing whether the difference between the signal strength of the neighboring cell and the signal strength of the serving cell satisfies the relative threshold.
  • the cell In the urban environment, the cell is dense, the wireless signal is complex, and the signal of the cell and its neighboring cells is constantly changing frequently. Therefore, the relative difference between the signal of the cell and the neighboring cell is more severe, so that the terminal user frequently reports the measurement report.
  • the uplink data load increases, and the location of the terminal in the cell changes continuously at the cell center and the cell edge, thereby causing an increase in the scheduler load, and the stability of the scheduling algorithm is deteriorated.
  • the main object of the present invention is to provide a method and a base station for determining a downlink static ICIC, which can effectively reduce frequent handover of a terminal at a cell center and a cell edge in an ICIC algorithm.
  • a method for discriminating a downlink static ICIC comprising:
  • the relative signal strength of the terminal is greater than the first threshold, and the absolute signal strength of the terminal is greater than the second threshold, determining that the terminal is in a central area of the local cell, otherwise determining that the terminal is in the local cell The edge of the zone.
  • the relative signal strength is a difference between a signal strength of a local cell of the terminal and a signal strength of a neighboring cell of the terminal
  • the absolute signal strength is a signal strength of a local cell of the terminal.
  • the first threshold is 5 db.
  • the second threshold is an average signal strength of the terminal at a handover point of the local cell.
  • the acquiring process of the second threshold is: R S RP h In the n: RSRP Aresk — iac — m is the absolute threshold of the cell m in the ICIC discriminating process, and n is the number of cells in the test line and the network optimization line that are adjacent to the cell m and switch, RSRP im The signal strength of the switching point when the area i is switched to the cell m.
  • a base station comprising:
  • a threshold value determining unit configured to preset a first threshold value, and obtain a second threshold value according to the number of switching cells and the signal strength of the switching point; a threshold value comparing unit, configured to determine, when the relative signal strength of the terminal is greater than the first threshold, and the absolute signal strength of the terminal is greater than the second threshold, determining that the terminal is in a central area of the local cell, Otherwise, it is determined that the terminal is in the edge zone of the local cell.
  • the relative signal strength is a difference between a signal strength of a local cell of the terminal and a signal strength of a neighboring cell of the terminal
  • the absolute signal strength is a signal strength of a local cell of the terminal.
  • the first threshold is 5 db.
  • the second threshold is an average signal strength of the terminal at a handover point of the local cell.
  • the acquiring process of the second threshold is: R S RP h In the n: RSRP Aresk — iac — m is the absolute threshold of the cell m in the ICIC discriminating process, and n is the number of cells in the test line and the network optimization line that are adjacent to the cell m and switch, RSRP im The signal strength of the switching point when the area i is switched to the cell m.
  • the technical solution of the present invention has the following beneficial effects:
  • the relative signal strength and the absolute signal strength of the terminal provided by the present invention determine that the terminal is located at the cell center or the cell edge, and avoids frequent switching of the terminal at the cell center and the cell edge, and According to the judgment situation, the transmission power of the terminal is adjusted, which solves the problem that the terminal throughput of the weak coverage area is low, and improves the experience and feeling of the terminal user.
  • FIG. 1 is a flowchart of a method for determining a downlink static ICIC according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • An embodiment of the present invention provides a method for discriminating a downlink static ICIC. As shown in FIG. 1, the method includes the following steps:
  • S110 preset a first threshold, and obtain a second threshold according to the number of handover cells and the signal strength of the handover point;
  • the signal strength of the first threshold is preferably 5 db. In other embodiments, the signal strengths of other values may be used, such as 8 db, 10 db, etc.; the second threshold is the switching point of the terminal at the local cell.
  • the average signal strength can also be other signal strengths, such as values that are slightly above the average signal strength or slightly below the average signal strength.
  • the relative signal strength is a criterion defined in the A3 event in 3GPP (The 3rd Generation Partnership Project) 36.331-930 protocol 5.5.4.3.
  • the difference between the signal strength of the local cell of the terminal and the signal strength of the neighboring cell of the terminal is a relative value.
  • the absolute signal strength is the signal strength of the cell in the terminal, and the absolute signal strength is the criterion defined in the A2 event in 3GPP (The 3rd Generation Partnership Project) 36.331-930 protocol 5.5.4.3.
  • the second threshold is an absolute value.
  • the terminal when the difference between the signal strength of the local cell of the terminal and the signal strength of the neighboring cell of the terminal is higher than a certain threshold, for example, when the signal strength is the first threshold of 5 db, the terminal is further judged.
  • the absolute value of the signal strength of the cell when the absolute value of the signal strength is higher than a certain threshold, such as the second threshold, the terminal can be determined to be the center.
  • the user that is, is located in the center of the cell, otherwise it is an edge user, that is, located at the edge of the cell.
  • the terminal is frequently switched between the cell center and the cell edge, and the terminal determined as the edge user is scheduled to the frequency band that does not interfere with each other, and the transmission power is increased for the frequency band, thereby solving the low terminal throughput of the weak coverage area.
  • the problem is to improve the experience and feeling of the end user.
  • the second threshold is an absolute threshold
  • n is the number of cells in the test line and the network optimization line that are adjacent to the cell m and is switched, and is the signal strength of the switching point when the cell i switches to the cell m.
  • the embodiment of the present invention further provides a base station.
  • the base station 200 includes: a threshold value determining unit 210, configured to preset a first threshold, and according to the number of switching cells and the signal strength of the switching point. Obtain a second threshold value;
  • the threshold comparison unit 220 is configured to determine that the terminal is in a central area of the cell when the relative signal strength of the terminal is greater than the first threshold and the absolute signal strength of the terminal is greater than the second threshold. Otherwise, it is determined that the terminal is in the edge zone of the local cell.
  • the first threshold value is preset by the threshold value determining unit 210, and the second threshold value is obtained according to the number of switching cells and the signal strength of the switching point, and then judged by the threshold value comparing unit 220.
  • the relative signal strength of the terminal is greater than the first threshold, and the absolute signal strength of the terminal is greater than the second threshold, determining that the terminal is located in a central area of the cell, that is, the terminal user is a central user; Otherwise it is an edge user, located at the edge of the cell.
  • the terminal can be prevented from being frequently converted at the cell center and the cell edge, and the terminal determined as the edge user is scheduled to a frequency band that does not interfere with each other, and the transmission power is increased for the frequency band, thereby solving the problem that the terminal throughput of the weak coverage area is low. Improve the end user experience and feelings.
  • the relative signal strength is a difference between a signal strength of the local cell of the terminal and a signal strength of a neighboring cell of the terminal, where the absolute signal strength is the end The signal strength of the local cell at the end.
  • the first threshold value is 5 db.
  • the second threshold is an average signal strength of the terminal at the switching point of the local cell.
  • the second threshold is an absolute threshold
  • n is the number of cells in the test line and the network optimization line that are adjacent to the cell m and is switched, and is the signal strength of the switching point when the cell i switches to the cell m.

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  • Computer Networks & Wireless Communication (AREA)
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Description

下行静态 ICIC的判别方法及基站 技术领域
本发明涉及通信技术领域， 尤其涉及一种下行静态 ICIC ( Internal Cell Interference Coordination , 小区干扰办调） 的判别方法及基站。 背景技术
目前, 在 TDD—LTE ( Time Division Duplexing—Long Term Evolution, 时分双工的长期演进） 系统中小区间的干扰协调技术 ICIC包括静态 ICIC、 半静态 ICIC和动态 ICIC技术。 ICIC是通过用户调度和功率分配来实现的。 考虑到小区中心用户和边缘用户处于不同的信道环境， 来自于邻小区的同 频干扰程度不同， 对用户流量影响不同， 因此通过对小区内的用户进行位 置的判别， 将小区内的用户划为小区中心用户和小区边缘用户两个集合。 系统对小区中心用户和小区边缘用户在频率调度和功率分配上采取不同的 策略， 以减低小区边缘用户的同频干扰， 也就是改善边缘用户的信道质量， 提升边缘用户的吞吐量， 进而提升边缘用户的频谱效率。 ICIC的主要目的 是通过提升边缘用户的吞吐率和用户感受度， 进而提升小区内所有用户感 受度。 由于半静态 ICIC和动态的 ICIC涉及到交互信息多， 算法复杂等因 素， 目前还没有真正实现并验证， 而静态 ICIC算法已经实现并进行验证测 试。
对于下行静态 ICIC来说， 其基本思想是 "频带错开 +功率分配"。 频带 错开， 指的是要把邻小区之间因为随机频率分配导致的 "边缘频带"和"边缘 频带"的碰撞错开， 变成"边缘频带"和"中心频带"碰撞。 因为边缘用户之间 如果有比较强的干扰，就会使整网边缘用户的干扰很大，让"边缘频带"和"中 心频带"碰撞， 同时辅助以功率分配策略， 简单而言就是"中心低功率， 边缘 高功率"， 就能够有效地改善边缘用户的 SINR ( Signal to Interference plus Noise Ratio, 信号与干扰加噪声比）， 改善边缘用户的流量。 但是， 另一方 面， 中心用户的发射功率降低， 且如果和对方提升了功率的边缘用户碰撞， 干扰增大， 所以中心用户整体的 SINR或者说 MCS ( Modulation and Coding Scheme, 调制编码方案）等级会有所下降。 但是， 由于中心用户的 SINR 比较好， 通过牺牲部分中心流量来换取边缘流量， 提升小区整体用户的感 受度， 是非常有意义的。
对于下行静态 ICIC, 基站可以根据分配的频带结合调度算法动态调度 中心用户和边缘用户的频率资源和功率。
因此， 下行静态 ICIC的一个关键技术就是如何定义小区中心用户和边 缘用户， 也就是如何把小区内用户区分为小区中心用户和小区边缘用户。 目前的算法是通过基站给终端下发 ICIC 的 A3事件的测量控制， 通过 UE 上才艮基于 ICIC的 A3测量 4艮告中的相对门限法来判别 UE的位置属性， 即 小区中心还是小区边缘， 然后通知调度器， 进行频率和功率的分配。 该事 件是通过比较邻小区的信号强度和服务小区的信号强度的差值是否满足该 相对门限来判断终端是处于小区边缘还是小区中心的。
然后在应用中，采用上述 A3事件的相对门限法来判断终端处于小区边 缘还是小区中心， 存在如下问题：
在城区环境， 小区密集， 无线信号复杂， 本小区和其邻小区信号在不 断的频繁变化中， 因此造成了本小区和邻小区信号的相对差值变化更剧烈， 使得终端用户频繁的上报测量报告， 上行数据负荷增大， 终端在小区中的 位置在小区中心和小区边缘不断的变化， 进而造成调度器负荷的增加， 调 度算法稳定性变差。
处于小区弱覆盖区域时， 由于本小区和邻小区的信号差不满足小区边 缘条件， 导致终端被调度到小区中心， 此时， 终端本来信号就比较差， 而 对小区中心的用户在功率分配上又会降低， 造成了该情况下终端的流量更 差， 影响用户的感受度。 发明内容
本发明的主要目的是提供一种下行静态 ICIC的判别方法及基站， 可以 有效减低 ICIC算法中终端在小区中心和小区边缘的频繁切换。
本发明解决其技术问题所采用的技术方案是：
一种下行静态 ICIC的判别方法， 其包括：
预设第一门限值， 并根据切换小区个数和切换点的信号强度获取第二 门限值
当终端的相对信号强度大于所述第一门限值、 且所述终端的绝对信号 强度大于第二门限值时， 判定所述终端处于本小区的中心区域， 否则判定 所述终端处于本小区的边缘地带。
优选地， 所述相对信号强度为所述终端的本小区的信号强度与该终端 的邻小区的信号强度的差值， 所述绝对信号强度为所述终端的本小区的信 号强度。
优选地， 所述第一门限值为 5db。
优选地， 所述第二门限值为所述终端在本小区切换点的平均信号强度。 优选地， 所述第二门限值的获取过程为： RSRPh
Figure imgf000005_0001
其 n 中： RSRPAresk—iac—m为小区 m在 ICIC的判别过程中的绝对门限值， n为测试 线路和网优线路上与小区 m为邻小区并发生切换的小区个数， RSRPim为,、 区 i切换到小区 m时切换点的信号强度。
一种基站， 其包括：
门限值确定单元， 用于预设第一门限值， 并根据切换小区个数和切换 点的信号强度获取第二门限值； 门限值比较单元， 用于当终端的相对信号强度大于所述第一门限值、 且所述终端的绝对信号强度大于第二门限值时， 判定所述终端处于本小区 的中心区域， 否则判定所述终端处于本小区的边缘地带。
优选地， 所述相对信号强度为所述终端的本小区的信号强度与该终端 的邻小区的信号强度的差值， 所述绝对信号强度为所述终端的本小区的信 号强度。
优选地， 所述第一门限值为 5db。
优选地， 所述第二门限值为所述终端在本小区切换点的平均信号强度。 优选地， 所述第二门限值的获取过程为： RSRPh
Figure imgf000006_0001
其 n 中： RSRPAresk—iac—m为小区 m在 ICIC的判别过程中的绝对门限值， n为测试 线路和网优线路上与小区 m为邻小区并发生切换的小区个数， RSRPim为,、 区 i切换到小区 m时切换点的信号强度。
实施本发明的技术方案， 具有以下有益效果： 本发明提供的终端的相 对信号强度和绝对信号强度来判断终端位于小区中心或者小区边缘， 避免 了终端在小区中心和小区边缘的频繁的转换， 可以根据该判断情况对终端 所在的区域进行发射功率的调整， 解决了弱覆盖区域终端吞吐量低的问题， 提高了终端用户的体验和感受。 附图说明
图 1为本发明实施例提供的下行静态 ICIC的判别方法实现流程图； 图 2为本发明实施例提供的基站的结构示意图。
本发明目的的实现、 功能特点及优点将结合实施例， 参照附图做进一 步说明。 具体实施方式 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图 及实施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体 实施例仅仅用以解释本发明， 并不用于限定本发明。
本发明实施例提供一种下行静态 ICIC的判别方法， 如图 1所示， 其包 括如下步驟：
S110、 预设第一门限值， 并根据切换小区个数和切换点的信号强度获 取第二门限值；
本实施例中， 优选第一门限值的信号强度为 5db, 其他实施例中， 也可 为其他数值的信号强度， 如 8db、 10db等； 第二门限值为终端在本小区切 换点的平均信号强度， 也可以为其他的信号强度， 如稍高于平均信号强度 或者稍低于该平均信号强度的值。
S120、 当终端的相对信号强度大于所述第一门限值、 且所述终端的绝 对信号强度大于第二门限值时， 判定所述终端处于本小区的中心区域， 否 则判定所述终端处于本小区的边缘地带。
在步驟 S120 中， 所述相对信号强度为 3GPP ( The 3rd Generation Partnership Project, 第三代合作伙伴计划 ) 36.331-930协议 5.5.4.3中 A3事 件中定义的判断标准。 在 A3事件中， 终端的本小区的信号强度与该终端的 邻小区的信号强度的差值为相对值。 绝对信号强度为终端的本小区的信号 强度， 绝对信号强度为 3GPP ( The 3rd Generation Partnership Project, 第三 代合作伙伴计划） 36.331-930协议 5.5.4.3中 A2事件中定义的判断标准。在 A2事件中， 第二门限值为绝对值。 在本实施例中， 当终端的本小区的信号 强度与该终端的邻小区的信号强度的差值高于一定的门限， 如信号强度为 5db的第一门限值时， 则再判断终端的本小区的信号强度的绝对值， 当信号 强度的绝对值高于一定的门限， 如第二门限值时， 才能确定该终端为中心 用户， 即位于小区中心， 否则为边缘用户， 即位于小区边缘。 这样， 避免 了终端在小区中心和小区边缘的频繁转换， 将确定为边缘用户的终端调度 到互不干扰的频带， 并对该频带进行加大发射功率， 解决了弱覆盖区域终 端吞吐量低的问题， 提高了终端用户的体验和感受。
在上述实施例中， 所述第二门限值为绝对门限值， 该绝对门限值获取 过程为： 唐― c— m = ∑:1 其中： A^¾res -rac-m为小区 m在 ICIC
n
的判别过程中的绝对门限值， n为测试线路和网优线路上与小区 m为邻小 区并发生切换的小区个数， 为小区 i切换到小区 m时切换点的信号强 度。
本发明实施例还提供一种基站， 如图 2所示， 该基站 200包括： 门限值确定单元 210, 用于预设第一门限值， 并根据切换小区个数和切 换点的信号强度获取第二门限值；
门限值比较单元 220, 用于当终端的相对信号强度大于所述第一门限 值、 且所述终端的绝对信号强度大于第二门限值时， 判定所述终端处于本 小区的中心区域， 否则判定所述终端处于本小区的边缘地带。
本实施例中， 通过门限值确定单元 210来预设第一门限值， 并根据切 换小区个数和切换点的信号强度获取第二门限值， 然后通过该门限值比较 单元 220判断该终端的相对信号强度大于所述第一门限值、 且所述终端的 绝对信号强度大于第二门限值时， 才确定该终端位于本小区的中心区域， 即该终端用户为中心用户； 否则为边缘用户， 位于小区边缘。 可避免终端 在小区中心和小区边缘的频繁转换， 将确定为边缘用户的终端调度到互不 干扰的频带， 并对该频带进行加大发射功率， 解决了弱覆盖区域终端吞吐 量低的问题， 提高了终端用户的体验和感受。
在本实施例中， 优选地， 所述相对信号强度为所述终端的本小区的信 号强度与该终端的邻小区的信号强度的差值， 所述绝对信号强度为所述终 端的本小区的信号强度。
在本实施例中， 优选地， 第一门限值为 5db。
在本实施例中， 优选地， 第二门限值为所述终端在本小区切换点的平 均信号强度。
在本实施例中， 优选地， 第二门限值即为绝对门限值， 该绝对门限值 的获取过程为： RSRPA =∑i=腹 , 其中： R^^¾res¾_iCiC_m为小区 m在
ICIC的判别过程中的绝对门限值， n为测试线路和网优线路上与小区 m为 邻小区并发生切换的小区个数， 为小区 i切换到小区 m时切换点的信 号强度。
以上仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本 发明的保护范围之内。

Claims

权利要求书
1、 一种下行静态小区干扰协调 ICIC 的判别方法， 其特征在于， 该方 法包括：
预设第一门限值， 并根据切换小区个数和切换点的信号强度获取第二 门限值 ^
当终端的相对信号强度大于所述第一门限值、 且所述终端的绝对信号 强度大于第二门限值时， 判定所述终端处于本小区的中心区域， 反之判定 所述终端处于本小区的边缘地带。
2、 如权利要求 1所述的方法， 其特征在于， 所述相对信号强度为所述 终端的本小区的信号强度与该终端的邻小区的信号强度的差值； 所述绝对 信号强度为所述终端的本小区的信号强度。
3、 如权利要求 2所述的方法， 其特征在于， 所述第一门限值为 5db。
4、 如权利要求 3所述的方法， 其特征在于， 所述第二门限值为所述终 端在本小区切换点的平均信号强度。
5、 如权利要求 4所述的方法， 其特征在于， 所述第二门限值为绝对门 限值， 绝对门限值的获取公式为： RSRP一 c = USRP碰 ,
n
其中： A^¾res¾-rac-m为小区 m在 ICIC的判别过程中的绝对门限值； n 为测试线路和网优线路上与小区 m为邻小区并发生切换的小区个数； RSRP^ 为小区 i切换到小区 m时切换点的信号强度。
6、 一种基站， 其特征在于， 该基站包括：
门限值确定单元， 用于预设第一门限值， 并根据切换小区个数和切换 点的信号强度获取第二门限值；
门限值比较单元， 用于确定终端的相对信号强度大于所述第一门限值、 且所述终端的绝对信号强度大于第二门限值时， 判定所述终端处于本小区 的中心区域， 反之判定所述终端处于本小区的边缘地带。
7、 如权利要求 6所述的基站， 其特征在于， 所述相对信号强度为所述 终端的本小区的信号强度与该终端的邻小区的信号强度的差值； 所述绝对 信号强度为所述终端的本小区的信号强度。
8、 如权利要求 7所述的基站， 其特征在于， 所述第一门限值为 5db。
9、 如权利要求 8所述的基站， 其特征在于， 所述第二门限值为所述终 端在本小区切换点的平均信号强度。
10、 如权利要求 9所述的基站， 其特征在于， 所述第二门限值为绝对 门限值， 绝对门限值的获取公式为： RSRPth h ΙΓΙΓ
Figure imgf000011_0001
,
n
其中： rac-m为小区 m在 ICIC的判别过程中的绝对门限值； n 为测试线路和网优线路上与小区 m为邻小区并发生切换的小区个数； RSRP^ 为小区 i切换到小区 m时切换点的信号强度。
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