WO2010121555A1 - 一种获取邻区上行信号质量的方法和切换优化方法 - Google Patents

一种获取邻区上行信号质量的方法和切换优化方法 Download PDF

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Publication number
WO2010121555A1
WO2010121555A1 PCT/CN2010/072045 CN2010072045W WO2010121555A1 WO 2010121555 A1 WO2010121555 A1 WO 2010121555A1 CN 2010072045 W CN2010072045 W CN 2010072045W WO 2010121555 A1 WO2010121555 A1 WO 2010121555A1
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Prior art keywords
base station
transmission path
neighboring cell
user equipment
cell
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PCT/CN2010/072045
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English (en)
French (fr)
Inventor
和峰
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中兴通讯股份有限公司
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Priority to EP10766645.5A priority Critical patent/EP2424302B1/en
Priority to US13/259,768 priority patent/US8892099B2/en
Publication of WO2010121555A1 publication Critical patent/WO2010121555A1/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
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates to a wireless cellular communication system, and more particularly to a method and a handover optimization method for acquiring uplink uplink signal quality in a Long Term Evolution (LTE) mobile communication system.
  • LTE Long Term Evolution
  • the LTE network consists of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) base station, an Evolved Node B (eNB) and an Evolved Packet Core EPC (Evolved Packet Core EPC). .
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • eNB Evolved Node B
  • EPC Evolved Packet Core EPC
  • the coverage of an LTE system consists of cells that are governed by several eNBs. When a user moves in a cell system, it is inevitable to move from one cell to another, which results in cell reselection or cell handover. A simple example, when a user is on a call, moving from the coverage of a cell to the coverage of another cell, the user needs to be able to automatically switch between cells in order to prevent the call from being interrupted.
  • the handover can be divided into intra-cell handover, intra-eNB inter-cell handover, inter-eNB handover, and inter-eNB handover.
  • the handover process may refer to the process of inter-eNB handover. Referring to FIG. 1, the method includes: Step 101: A user equipment (UE) reports a downlink measurement result to the serving eNB1; Step 102, the eNB1 makes a handover selection. And completing the handover preparation process with the handover target side eNB2;
  • UE user equipment
  • Step 103 The eNB1 notifies the UE to perform handover by signaling.
  • step 104 the UE performs handover to the eNB2 according to the signaling.
  • the network-side handover selection process in step 102 needs to comprehensively consider many factors, among which the most The main one is the measurement report of the UE in step 101.
  • the network side can The UE is notified to perform the handover.
  • the network side also needs to obtain some other auxiliary information for reference.
  • the network side needs to carry the history information of the UE when switching, including the UE being in a call or Information such as the time spent in the last community during the business process.
  • RLF radio link failure
  • the UE has a radio link failure (RLF) in the target cell shortly after the handover, which affects the system performance and affects the system. User experience.
  • RLF radio link failure
  • the uplink transmission of the UE in the target cell is not ideal.
  • the UE is based on the measurement of the downlink service signal of the neighboring cell.
  • LTE in order to reduce the manual maintenance workload of the network and optimize the network capability, LTE needs to support the self-organizing network (Self-Organized) in the current demand of the Next Generation Mobile Networks (NGMN) organization.
  • Network, SON network coverage and capacity optimization (CCO) function, which can automatically modify the parameter configuration of the cell through the automatic configuration function and self-optimization function of the network, thereby achieving network coverage optimization.
  • CCO network coverage and capacity optimization
  • the network side needs to obtain input parameters of current network coverage performance.
  • the cell A and the cell B under the jurisdiction of the eNB1 and the eNB2 are in the neighboring cell, but the uplink and downlink coverage of the cell A is problematic, and the uplink coverage is smaller than the downlink coverage.
  • the measurement of the UE may not be reported due to insufficient uplink, and the UE may eventually drop the call. Therefore, how to find the problem area is also a problem to be solved.
  • the technical problem to be solved by the present invention is to provide a method for acquiring uplink signal quality in a neighboring cell and a handover optimization method, and a corresponding base station, to improve user experience.
  • the present invention provides a method for obtaining uplink signal quality in a neighboring cell.
  • the method includes: the serving base station obtains a downlink transmission path loss of the user equipment in the neighboring area according to the reference signal power of the neighboring area and the measurement report result of the user equipment to the neighboring area, and uses the downlink transmission path loss as the user equipment.
  • the uplink transmission path loss of the neighboring area estimates the uplink signal quality of the user equipment in the neighboring area according to the uplink transmission path loss.
  • the method further includes: the reference signal power of the neighboring cell is reported by the user equipment to the serving base station, or the reference signal power of the neighboring cell is located by the neighboring cell
  • the base station notifies the serving base station by using an X2 port establishment process or an evolved base station configuration update process, where the reference cell power of the neighboring cell is included in the serving cell information of the X2 port setup or response message, or the evolved base station configuration update message
  • the serving cell information includes the reference signal power of the neighboring cell.
  • the method further includes: if the uplink transmission path loss of the user equipment in the neighboring area is greater than a set If the serving base station does not match the uplink coverage and the downlink coverage of the neighboring cell, the serving base station notifies the base station where the neighboring cell is covered.
  • the method further includes: the second threshold is configured by an operation management and maintenance (OAM) system; or the second threshold is notified by the base station where the neighbor is located to the serving base station.
  • OAM operation management and maintenance
  • the base station where the neighboring cell is located notifies the serving base station of the second threshold by: the base station where the neighboring cell is located notifies the serving base station by using an X2 port establishment process or an evolved base station configuration update process, and is at X2
  • the serving cell information of the port setup or response message includes the second threshold, or the serving cell information of the evolved base station configuration update message includes the second threshold.
  • the method further includes: the serving base station notifying an operation management and maintenance (OAM) system that the base station where the neighboring cell is located has an abnormal coverage.
  • OAM operation management and maintenance
  • the present invention further provides a handover optimization method, which includes: the serving base station of the user equipment estimates the uplink signal quality of the user equipment in the neighboring area according to the method for obtaining the uplink signal quality of the neighboring area, and the uplink signal quality of the user equipment in the neighboring area is not When the set condition is met, the serving base station uses the neighboring area as a cut The candidate neighbors are replaced, and other eligible cells are selected.
  • the setting condition is: the uplink transmission path loss of the user equipment in the neighboring area is greater than a set first threshold.
  • the handover optimization method further includes: the first threshold is configured by an operation management and maintenance (OAM) system; or the first threshold is notified by the base station where the neighbor is located to the serving base station.
  • OAM operation management and maintenance
  • the base station where the neighboring cell is located notifies the serving base station of the first threshold value by: the base station where the neighboring cell is located notifies the serving base station by using an X2 port establishment process or an evolved base station configuration update process, and is at X2
  • the serving cell information of the port establishment or response message includes the first threshold, or the serving cell information of the evolved base station configuration update message includes the first threshold.
  • the present invention further provides a base station, including a downlink transmission path loss obtaining module and an uplink signal quality acquiring module, where: the downlink transmission path loss obtaining module is configured to: according to the neighboring area reference signal power and user equipment pair The measurement result of the neighboring area is obtained, and the downlink transmission path loss of the current user equipment in the neighboring area is obtained; and the uplink signal quality acquiring module is configured to: use the downlink transmission path loss obtained by the downlink transmission path loss obtaining module as a user The device transmits the path loss in the uplink of the neighboring cell, and estimates the uplink signal quality of the user equipment in the neighboring cell according to the uplink transmission path loss.
  • the downlink transmission path loss obtaining module is configured to: according to the neighboring area reference signal power and user equipment pair The measurement result of the neighboring area is obtained, and the downlink transmission path loss of the current user equipment in the neighboring area is obtained
  • the uplink signal quality acquiring module is configured to: use the downlink transmission path loss obtained by the downlink transmission path loss
  • the downlink transmission path loss obtaining module is further configured to: receive a reference signal power of the neighboring cell reported by the user equipment, or a serving cell that is sent or responded to by the X2 interface established by the base station where the neighboring cell is located through the X2 interface establishment process;
  • the reference signal power of the neighboring cell is obtained in the information, or the reference signal power of the neighboring cell is obtained from the serving cell information of the configuration update message sent by the evolved base station configuration update process.
  • the base station further includes an abnormality detection notification module, where: the abnormality detection notification module is configured to: receive a second threshold configured by an operation management and maintenance (OAM) system, or receive a second wideness sent by the base station where the neighboring cell is located Value;
  • OAM operation management and maintenance
  • the base station further includes a switching module, where: the switching module is configured to: when the uplink signal quality of the user equipment in the neighboring area does not meet the set condition, use the neighboring area as a candidate neighboring area for handover, and continue to select other Eligible community; among them,
  • the setting condition is: the uplink transmission path loss of the user equipment in the neighboring area is greater than a set first threshold.
  • the switching module is further configured to: receive a first threshold of an operation management and maintenance (OAM) system configuration; or receive a first threshold value sent by the base station where the neighboring cell is located.
  • OAM operation management and maintenance
  • the present invention can be used to enable the source base station to estimate the uplink transmission quality of the UE in the neighboring cell, thereby optimizing the handover target selection, thereby reducing the handover failure rate of the UE; and simultaneously detecting the coverage problem of the neighboring cell in time, and reporting the coverage problem.
  • the district so that the neighborhood can be optimally adjusted for coverage.
  • FIG. 1 is a schematic diagram of an inter-eNB handover procedure
  • FIG. 2 is a schematic diagram of a cell uplink and downlink coverage anomaly
  • FIG. 3 is a flowchart of Embodiment 1 of the present invention
  • FIG. 4 is a flowchart of Embodiment 2 of the present invention
  • Figure 6 is a flow chart of eNB configuration update.
  • the present invention proposes a method for estimating the uplink signal quality of a neighboring cell:
  • the >3 ⁇ 4 result of the area and the reference signal power of the neighboring area obtain the downlink transmission path loss of the user equipment in the neighboring area, and the downlink transmission path loss is used as the uplink transmission path loss of the user equipment in the neighboring area, according to the uplink transmission path
  • the loss estimates the uplink signal quality of the user equipment in the neighboring cell.
  • handover optimization and coverage optimization can be performed.
  • the network side When performing network handover selection, the network side considers the uplink signal quality of the UE in the neighboring area, and specifically estimates the uplink transmission path loss of the UE in the neighboring area according to the signal quality of the neighboring area measured by the UE and the reference signal power of the neighboring area.
  • the uplink signal quality of the UE in the target cell is estimated according to the uplink transmission path loss size, so that the handover selection of the local cell can be optimized.
  • the network side can also detect the uplink and downlink coverage problems of the neighboring area according to the path loss of the neighboring area, so that the coverage area can be notified to the neighboring area as an input parameter for the coverage optimization of the neighboring area. Specifically, whether the uplink and downlink coverage of the neighboring cell matches is determined according to the uplink transmission path loss, and when the coverage does not match, the base station where the neighboring cell is located is notified.
  • cell VIII and cell B are two cells belonging to two different base stations eNB1 and eNB2 which are adjacent to each other.
  • the eNB1 performs handover optimization selection according to the measurement report result and the uplink signal quality of the UE in the neighboring cell, and specifically includes: Step 301: The UE in the cell A reports the measurement result to the eNB1, where the UE is included. For the measurement result of the cell B signal, the UE also calculates the reference signal power of the cell B by the ReferenceSignalPower information; Step 302, the eNB1 calculates the UE according to the reference signal power of the cell B, ReferenceSignalPower, and the measurement result of the UE to the cell B signal.
  • the downlink transmission path loss PLi of the cell B is small, so the calculated downlink transmission path loss PL DL is approximated as the uplink transmission path loss PL UL of the UE in the cell B, because the difference between the uplink path loss and the downlink path loss is small during the wireless transmission.
  • PL UL - PL DL reference SignalPower - M N where M w is the measurement result of the UE for the cell B signal.
  • the eNB1 uses the cell B as the candidate neighboring cell of the handover target side, and continues to select other eligible neighboring cells.
  • the first threshold Thresh H0 used in step 303 can be OAM (Operation Management and Maintenance) Administration and Maintenance, OAM)
  • OAM Operaation Management and Maintenance
  • the default value of the system configuration may also notify the eNB2 of the specified value of the eNB1.
  • the method for the eNB2 to notify the eNB1 may be through the X2 port establishment process (as shown in FIG. 5), or the eNB configuration update process (eg, As shown in FIG. 6 , the serving cell information in the related message includes the maximum road loss threshold Thresh H0 allowed by the local cell, that is, the serving cell information included in the X2 port setup/response message or the eNB configuration update message includes the foregoing A wide value.
  • the serving cell information in the related message includes the maximum road loss threshold Thresh H0 allowed by the local cell, that is, the serving cell information included in the X2 port setup/response message or the eNB configuration update message includes the foregoing A wide value.
  • FIG. 4 is a flowchart of a coverage optimization method according to the present invention, including: Steps 401 - 402, the same steps 301 - 302; Step 403, if in step 402, the UE calculates the uplink of the UE in the cell B. the second wide transmission path loss P t / greater than the set value Thresh co Li GE, described uplink and downlink coverage of the neighboring cell does not match, i.e., insufficient uplink coverage or downlink coverage neighbor too large.
  • the eNB1 notifies the eNB2 of the coverage exception through the X2 port message.
  • Step 304 After receiving the message, the eNB2 adds the message to its own statistical data, and uses the statistical data as an input for subsequently adjusting its uplink and downlink coverage.
  • the eNB1 may also notify the coverage abnormality of the eNB2.
  • the OAM determines whether the eNB2 needs to adjust the coverage parameters.
  • the second width used in step 403 the value 73 ⁇ 4re * 3 ⁇ 4 COTm4 G £, may be notified to the specified value eNBl eNB2 OAM configuration default values.
  • the method in which the eNB2 notifies the eNB1 may pass the X2 port establishment process (as shown in FIG. 5) or the eNB configuration update process (as shown in FIG. 6), and the serving cell information in the related message includes the maximum road loss threshold allowed by the local cell. That is, the second threshold is included in the serving cell information of the X2 port setup/response message or the eNB configuration update message.
  • the reference signal power ReferenceSignalPower information of the cell B under the control of the eNB2 in step 301 or step 401 in the first embodiment and the second embodiment may also be notified by the eNB2 to the eNB1, wherein the method for the eNB2 to notify the eNB1 may pass the X2 port establishment process (eg, As shown in FIG. 5, or the eNB configuration update process (as shown in FIG. 6), the serving cell information in the related message includes the reference signal power of the local cell, that is, the X2 port setup/response message or the eNB configuration update message. The reference signal power is included in the serving cell information.
  • FIG. 5 is an X2 port establishment process, by which one or a combination of a first threshold, a second threshold, and a reference signal power may be transmitted, and the first threshold and the second threshold may be included in the X2 port setup/response message.
  • the reference signal power includes: Step 501: The eNB1 initiates an X2 setup request message to the eNB2, where the serving cell information of the cell A in the setup request message includes the reference signal power of the cell A, ReferenceSignalPower information, the cell
  • the maximum allowable road loss threshold is 73 ⁇ 4r ⁇ 1 ⁇ 2 0 , and the maximum road loss allowed in the community.
  • ThreshcovERAGE One or more of ThreshcovERAGE.
  • Step 502 After receiving the eNB2, if the processing succeeds, return an X2 setup response message to the eNB1, where the serving cell information of the cell B in the setup response message includes the reference signal power ReferenceSignalPower information of the cell B, and the maximum path loss allowed by the cell.
  • the threshold Thresh H0 and one or more of the maximum road loss threshold Thresh C0VERAGE allowed in the community.
  • FIG. 6 is an eNB configuration update process, in which one or a combination of a first threshold, a second threshold, and a reference signal power can be transmitted through the process, including: Step 601: eNB2 initiates an eNB configuration update message to the eNB 1 in the configuration.
  • the serving cell information in the update message includes the reference signal power ReferenceSignaWower information of the cell B, the maximum road loss threshold Thresh H0 allowed by the current cell, and one or more of the maximum road loss threshold ThreshcovERAGE allowed by the cell.
  • Step 602 After receiving the eNB1, the eNB1 returns an eNB configuration update confirmation message to the eNB2.
  • the present invention further provides a base station, including a downlink transmission path loss obtaining module and an uplink signal quality acquiring module, where: the downlink transmission path loss obtaining module is configured to: according to the neighboring reference signal power and the user equipment neighbor The measurement result of the area is reported, and the downlink transmission path loss of the current user equipment in the neighboring area is obtained; and the uplink signal quality acquisition module is configured to: use the downlink transmission path loss obtained by the downlink transmission path loss obtaining module as the user equipment in the neighboring area Uplink transmission path loss, and estimating the uplink signal quality of the user equipment in the neighboring area according to the uplink transmission path loss.
  • the downlink transmission path loss obtaining module is further configured to: receive the reference signal power of the neighboring cell reported by the user equipment, or obtain the neighboring cell in the serving cell information of the X2 port establishment or response message sent by the base station where the neighboring cell is located through the X2 port establishment process.
  • the reference signal power of the area, or the reference cell power of the neighboring area is obtained from the serving cell information of the configuration update message sent by the evolved base station configuration update procedure.
  • the base station further includes an abnormality detection notification module, where: the abnormality detection notification module is configured to: receive a second threshold configured by the operation management and maintenance (OAM) system, or receive a second threshold sent by the base station where the neighboring cell is located; and determine the user equipment Whether the uplink transmission path loss in the neighboring area is greater than the set second threshold. If the distance is greater than, the uplink coverage and the downlink coverage of the neighboring area do not match, and the neighboring area where the neighboring area is located and/or the neighboring area of the OAM system is notified. The base station coverage is abnormal.
  • OAM operation management and maintenance
  • the base station further includes a switching module, where: The switching module is configured to: when the uplink signal quality of the user equipment in the neighboring area does not meet the set condition, use the neighboring area as a candidate neighboring area for handover, and continue to select other eligible cells; wherein, the setting condition is: The uplink transmission path loss of the user equipment in the neighboring area is greater than a set first threshold.
  • the switching module is further configured to: receive a first threshold of the operation management and maintenance (OAM) system configuration; or receive a first threshold sent by the base station where the neighboring cell is located.
  • OAM operation management and maintenance
  • the present invention enables the source base station to estimate the uplink transmission quality of the UE in the neighboring cell, thereby optimizing the handover target selection, thereby reducing the handover failure rate of the UE; and simultaneously detecting the coverage problem of the neighboring cell in time, and covering the problem Feedback to the district to optimize the coverage of the neighborhood.

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Description

一种获取邻区上行信号质量的方法和切换优化方法
技术领域 本发明涉及无线蜂窝通信系统， 更具体地说， 是长期演进（Long Term Evolution, LTE )移动通信系统中获取邻区上行信号质量的方法和切换优化 方法。
背景技术
LTE 网络由演进的通用陆地无线接入网 （Evolved Universal Terrestrial Radio Access Network, E-UTRAN )基站即演进的基站（ Evolved Node B, eNB ) 和演进分组交换中心演进分组核心 （Evolved Packet Core EPC )组成。 LTE 系统的覆盖范围就是由若干 eNB管辖的蜂窝小区组成。 当一个用户在蜂窝小区系统中移动时， 就不可避免的会从一个小区移动 到另一个小区， 这就导致了小区重选或者小区切换。 一个简单的例子， 当一 个用户正在通话时， 从某小区的覆盖范围移动到另一个小区的覆盖范围时， 为使通话不被中断需要用户能在小区间自动切换。 这个过程是在用户察觉不 到的情况下进行的， 也不需要用户介入。 至于用户切换到哪个小区， 何时切 换都是由网络侧来选择的。 根据切换涉及的前后两个小区的归属， 可以把切 换分为小区内切换、 eNB内小区间切换、 eNB间切换、 不同接入系统间切换 等。 不失一般性的， 切换过程可以参考 eNB间切换的过程， 参考图 1 , 包括： 步骤 101 , 用户设备 ( User Equipment, UE )将下行测量结果报告给服 务 eNBl ; 步骤 102, eNBl做出切换选择， 并同切换目标侧 eNB2完成切换准备过 程；
步骤 103 , eNBl通过信令通知 UE进行切换； 步骤 104, UE根据信令执行向 eNB2的切换。 其中步骤 102中网络侧的切换选择过程需要综合考虑很多因素， 其中最 主要的就是步骤 101中 UE的测量上报， 当本小区的服务信号质量低于某个 门限时， 且 1^上>¾的某个邻区的信号质量高于某个门限后， 网络侧就可以 通知 UE进行切换。 但是为了保证一些异常情况的发生， 网络侧还要获取一 些其他的辅助信息来参考， 比如为了避免乒乓切换的发生， 网络侧在切换时 需要携带有 UE的历史信息， 其中包含了 UE在通话或做业务过程中在上个 小区停留的时间等信息。 但是在现有的切换中， 还是不可避免会出现一些异常情况， 比如 UE在 切换之后不久就在目标小区发生了无线链路失败（ Radio Link Failure, RLF ) , 从而影响了系统性能， 也影响了用户的体验。 这其中一个原因就是 UE在目 标小区的上行发送不理想造成的。 在现有的切换选择考虑的主要因素中是依 据的 UE对邻区下行服务信号的测量得出的。 另外，在 LTE系统中，为了减少网络的人工维护工作量和优化网络能力， 当前在下一代移动网络 ( Next Generation Mobile Networks, NGMN )组织提 出的需求中， LTE需要支持自组织网络（Self-Organized Network, SON)功能， 其中包括网络的覆盖和容量优化 ( Coverage and Capacity Optimization , CCO )功能， 即可以通过网络的自动配置功能和自优化功能来自动修改小区 的参数配置， 从而达到网络覆盖的优化。
发明内容 为了在 LTE系统实现 CCO功能， 网络侧需要获得当前网络覆盖性能的 输入参数。 如图 2所示， eNBl和 eNB2所管辖小区 A和小区 B为邻区， 但 是小区 A的上下行覆盖有问题， 上行覆盖小于下行覆盖， 此时， 当处于小区 A的 UE移动到图示的区域 D时， 就会因上行不足而出现 UE的测量也无法 上报， 最终 UE掉话等现象， 因此如何发现这一问题区域也是一个需要解决 的问题。 本发明要解决的技术问题是提供一种获取邻区上行信号质量的方法和切 换优化方法， 以及相应的基站， 以提高用户体验。 为了解决上述问题， 本发明提供了一种获取邻区上行信号质量的方法， 其包括： 服务基站根据所述邻区的参考信号功率和用户设备对邻区的测量上 报结果， 得到当前该用户设备在该邻区的下行传输路损， 将该下行传输路损 作为用户设备在该邻区的上行传输路损， 根据该上行传输路损估算用户设备 在邻区的上行信号质量。 在得到所述下行传输路损的步骤前， 所述方法还包括： 所述邻区的参考信号功率由所述用户设备上报给服务基站， 或者， 所述邻区的参考信号功率由邻区所在基站通过 X2 口建立过程或演进的 基站配置更新过程通知服务基站， 其中， 在 X2 口建立或响应消息的服务小 区信息中包含所述邻区的参考信号功率， 或在演进的基站配置更新消息的服 务小区信息中包含该邻区的参考信号功率。 在将所述下行传输路损作为用户设备在所述邻区的上行传输路损的步骤 后， 所述方法还包括： 如果所述用户设备在该邻区的上行传输路损大于设定的第二阔值， 则服 务基站认为该邻区的上行覆盖和下行覆盖不匹配， 服务基站通知所述邻区所 在基站覆盖异常。 所述方法还包括： 所述第二阔值由操作管理维护（OAM )系统配置； 或 者， 所述第二阔值由该邻区所在基站通知所述服务基站。 所述邻区所在基站通过如下方式将所述第二阔值通知给所述服务基站： 所述邻区所在基站通过 X2 口建立过程或者演进的基站配置更新过程通知所 述服务基站， 且在 X2 口建立或响应消息的服务小区信息中包含所述第二阔 值， 或演进的基站配置更新消息的服务小区信息中包含所述第二阔值。 所述方法还包括： 所述服务基站通知操作管理维护（OAM )系统所述邻 区所在基站覆盖异常。
本发明还提出一种切换优化方法， 其包括： 用户设备的服务基站根据上 述获取邻区上行信号质量的方法估算用户设备在邻区的上行信号质量， 当用 户设备在邻区的上行信号质量不满足设定条件时， 服务基站将该邻区作为切 换的候选邻区， 而继续选择其他符合条件的小区。 所述设定条件为： 该用户设备在该邻区的上行传输路损大于设定的第一 阔值。 所述切换优化方法还包括： 所述第一阔值由操作管理维护（OAM )系统 配置； 或者， 所述第一阔值由该邻区所在基站通知所述服务基站。 所述邻区所在基站通过如下方式将所述第一阔值通知给所述服务基站： 所述邻区所在基站通过 X2 口建立过程或者演进的基站配置更新过程通知所 述服务基站， 且在 X2 口建立或响应消息的服务小区信息中包含所述第一阔 值， 或演进的基站配置更新消息的服务小区信息中包含所述第一阔值。
本发明还提供了一种基站， 其包括下行传输路损获取模块和上行信号质 量获取模块， 其中： 所述下行传输路损获取模块设置为： 根据所述邻区的参考信号功率和用 户设备对邻区的测量上报结果， 得到当前所述用户设备在所述邻区的下行传 输路损； 以及 上行信号质量获取模块设置为： 将所述下行传输路损获取模块得到的下 行传输路损作为用户设备在所述邻区的上行传输路损， 并根据所述上行传输 路损估算用户设备在邻区的上行信号质量。 所述下行传输路损获取模块还设置为： 接收用户设备上报的所述邻区的 参考信号功率，或者， 自邻区所在基站通过 X2口建立过程发送的在 X2口建 立或响应消息的服务小区信息中获取所述邻区的参考信号功率， 或者自演进 的基站配置更新过程发送的配置更新消息的服务小区信息中获取所述邻区的 参考信号功率。 所述基站还包括异常检测通知模块， 其中： 所述异常检测通知模块设置为： 接收由操作管理维护（OAM )系统配置 的第二阔值， 或者接收所述邻区所在基站发送的第二阔值； 以及
Figure imgf000006_0001
值， 如果大于， 则所述邻区的上行覆盖和下行覆盖不匹配， 通知所述邻区所 在基站和 /或操作管理维护 （OAM ) 系统所述邻区所在基站覆盖异常。 所述基站还包括切换模块， 其中： 所述切换模块设置为： 当用户设备在邻区的上行信号质量不满足设定条 件时， 将所述邻区作为切换的候选邻区， 而继续选择其他符合条件的小区； 其中，
所述设定条件为： 所述用户设备在所述邻区的上行传输路损大于设定的 第一阔值。 所述切换模块还设置为： 接收操作管理维护（OAM )系统配置的第一阔 值； 或者， 接收所述邻区所在基站发送的第一阔值。
应用本发明， 使源基站可以估算 UE在邻区的上行发送质量， 依此来优 化切换目标选择， 从而可以减少 UE的切换失败率； 同时也可以及时发现邻 区的覆盖问题， 将覆盖问题反馈给部区， 以便邻区进行覆盖的优化调整。
附图概述 图 1为 eNB间切换过程示意图； 图 2为小区上下行覆盖异常示意图； 图 3是本发明实施例一流程图； 图 4为本发明实施例二流程图； 图 5为 X2口建立流程图； 图 6为 eNB配置更新流程图。
本发明的较佳实施方式 本发明提出如下一种估算邻区上行信号质量的方法： 根据用户设备对邻 区的测量上>¾结果和该邻区的参考信号功率得到该用户设备在邻区的下行传 输路损， 将下行传输路损作为用户设备在该邻区的上行传输路损， 根据上行 传输路损估算用户设备在该邻区的上行信号质量。 根据所述估算邻区上行信号质量方法， 可以进行切换优化和覆盖优化。 网络侧在做 UE切换选择时， 考虑 UE在邻区的上行信号质量， 具体是根据 UE测量上 的邻区的信号质量和邻区的参考信号功率，来估算 UE在邻区的 上行传输路损，根据上行传输路损大小估算 UE在目标小区的上行信号质量， 从而可以优化本小区的切换选择。 网络侧还可以根据邻区的路损探测邻区的上下行覆盖问题， 从而可以将 覆盖异常通知邻区， 以作为邻区进行覆盖优化的输入参数。 具体可根据上行 传输路损判断邻区的上下行覆盖是否匹配， 在覆盖不匹配时， 通知邻区所在 基站。
为使本发明的目的、 技术方案和优点更加清楚， 以下对本发明作进一步 地详细描述， 其中小区八、 小区 B是分属于两个不同基站 eNBl、 eNB2的两 个互为邻区的小区。
实施例一 如图 3所示， eNBl根据测量上报结果和 UE在邻区的上行信号质量作切 换优化选择， 具体包括： 步骤 301 , 处于小区 A中的 UE将测量结果上报 eNBl , 其中包含了 UE 对小区 B 信号的测量结果， 同时 UE 还将小区 B 的参考信号功率 ReferenceSignalPower信息上才艮 eNBl ; 步骤 302, eNBl根据小区 B的参考信号功率 ReferenceSignalPower和 UE对小区 B信号的测量结果， 计算 UE在小区 B的下行传输路损 PLi , 因 为无线传输过程中， 上行路损与下行路损差别很小， 因此将计算的下行传输 路损 PLDL近似作为 UE在小区 B的上行传输路损 PLUL, 即： PLUL - PLDL = reference SignalPower—MN 其中 Mw为 UE对小区 B信号的测量结果。 步骤 303 , 如果 UE的测量上报结果满足切换条件， eNBl将进一步根据 上一步中计算的小区 B的上行传输路损 做出切换选择。如果 UE在小区 B的上行信号质量不满足设定条件，即 ^7^值大于设定的第一阔值 ThreshH0, 说明 UE在小区 B上行发射功率不足， 或者小区 B对 UE的上行服务质量不 满足当前 UE的业务需求。此时 eNBl将小区 B作为切换目标侧的候选邻区， 而继续选择其他符合条件的邻区； 进一步的， 在步骤 303 中使用的第一阔值 ThreshH0, 可以为 OAM (操 作管理维护 ( Operation Administration and Maintenance , OAM ) 系统配置的 缺省值， 也可以为 eNB2通知 eNBl的指定值。 其中 eNB2通知 eNBl的方法 可以通过 X2口建立过程（如图 5所示 ) , 或者 eNB配置更新过程（如图 6 所示） ， 在相关消息中的服务小区信息中包含本小区允许的最大路损阔值 ThreshH0, 即在 X2口建立 /响应消息或 eNB配置更新消息的服务小区信息中 包含所述第一阔值。
实施例二 图 4所示是本发明提出的覆盖优化方法流程图， 包括： 步骤 401 - 402 , 同步骤 301 - 302; 步骤 403 , 如果在步骤 402中， eNBl计算的 UE在小区 B中的上行传输 路损 P t/ 大于设定的第二阔值 Threshco丽 GE , 说明邻区的上下行覆盖不匹 配， 即上行覆盖不足， 或者邻区的下行覆盖过大。 此时 eNBl通过 X2 口消 息通知 eNB2覆盖异常。 步骤 304 , eNB2收到后将此消息纳入自己统计数据， 并根据统计数据作 为后续调整自身上下行覆盖的输入。
进一步的， 在步骤 403 中， eNBl也可以将 eNB2的覆盖异常情况通知 OAM, 由 OAM来统一决策 eNB2是否需要调整覆盖参数。 进一步的， 在步骤 403中使用的第二阔值 7¾re*¾COTm4G£, 可以为 OAM 配置的缺省值， 也可以为 eNB2通知 eNBl的指定值。 其中 eNB2通知 eNBl 的方法可以通过 X2口建立过程（如图 5 ) , 或者 eNB配置更新过程（如图 6 ) , 在相关消息中的服务小区信息中包含本小区允许的最大路损阔值
Figure imgf000010_0001
即在在 X2口建立 /响应消息或 eNB配置更新消息的服务小区 信息中包含所述第二阔值。
进一步的， 在实施例一和实施例二中步骤 301或者步骤 401中 eNB2所 辖小区 B 的参考信号功率 ReferenceSignalPower信息也可以由 eNB2通知 eNBl ,其中 eNB2通知 eNBl的方法可以通过 X2口建立过程（如图 5所示）， 或者 eNB配置更新过程（如图 6所示）， 在相关消息中的服务小区信息中包 含本小区的参考信号功率，即在在 X2口建立 /响应消息或 eNB配置更新消息 的服务小区信息中包含所述参考信号功率。
下面对图 5 , 图 6进行说明。 图 5为 X2口建立过程， 可以通过该过程传递第一阈值、 第二阈值和参 考信号功率中的一个或其组合，可以在 X2口建立 /响应消息中包含第一阔值、 第二阔值和参考信号功率中的一个或其组合， 包括： 步骤 501 , eNBl向 eNB2发起 X2建立请求消息， 在建立请求消息中的 小区 A的服务小区信息中包含小区 A的参考信号功率 ReferenceSignalPower 信息， 本小区允许的最大路损阔值 7¾r^½0, 和本小区允许的最大路损阔值
ThreshcovERAGE中的一个或多个。
步骤 502 , eNB2收到后如果处理成功， 则给 eNBl返回 X2建立响应消 息，在建立响应消息中的小区 B的服务小区信息中包含小区 B的参考信号功 率 ReferenceSignalPower信息， 本小区允许的最大路损阔值 ThreshH0 , 和本 小区允许的最大路损阔值 ThreshC0VERAGE中的一个或多个。 图 6为 eNB配置更新过程， 可以通过该过程传递第一阔值、 第二阔值和 参考信号功率中的一个或其组合， 包括： 步骤 601 , eNB2向 eNB 1发起 eNB配置更新消息，在配置更新消息中的 服务小区信息中包含小区 B的参考信号功率 ReferenceSignaWower信息， 本 小区允许的最大路损阔值 ThreshH0 , 和本小区允许的最大路损阔值 ThreshcovERAGE中的一个或多个。
步骤 602 , eNBl收到后给 eNB2返回 eNB配置更新确认消息。 相应的， 本发明还提供了一种基站， 其包括下行传输路损获取模块和上 行信号质量获取模块， 其中： 下行传输路损获取模块设置为： 根据邻区的参考信号功率和用户设备对 邻区的测量上报结果， 得到当前用户设备在该邻区的下行传输路损； 以及 上行信号质量获取模块设置为： 将下行传输路损获取模块得到的下行传 输路损作为用户设备在该邻区的上行传输路损， 并根据该上行传输路损估算 用户设备在邻区的上行信号质量。 下行传输路损获取模块还设置为： 接收用户设备上报的邻区的参考信号 功率，或者， 自邻区所在基站通过 X2口建立过程发送的在 X2口建立或响应 消息的服务小区信息中获取邻区的参考信号功率， 或者自演进的基站配置更 新过程发送的配置更新消息的服务小区信息中获取邻区的参考信号功率。 基站还包括异常检测通知模块， 其中： 异常检测通知模块设置为： 接收由操作管理维护（OAM )系统配置的第 二阔值， 或者接收邻区所在基站发送的第二阔值； 以及 判断用户设备在该邻区的上行传输路损是否大于设定的第二阔值， 如果 大于，则该邻区的上行覆盖和下行覆盖不匹配，通知邻区所在基站和 /或 OAM 系统所述邻区所在基站覆盖异常。 基站还包括切换模块， 其中： 切换模块设置为：当用户设备在邻区的上行信号质量不满足设定条件时， 将该邻区作为切换的候选邻区， 而继续选择其他符合条件的小区； 其中， 设定条件为： 所述用户设备在所述邻区的上行传输路损大于设定的第一 阔值。 切换模块还设置为： 接收操作管理维护 （OAM ) 系统配置的第一阔值； 或者， 接收邻区所在基站发送的第一阔值。
最后需要说明以上实施方式仅用于说明本发明， 而非用于限定本发明。 如果不脱离本发明的精神和范围的对本发明进行修改或者等同替换， 均应涵 盖在本发明的权利要求范围当中。
工业实用性 本发明使源基站可以估算 UE在邻区的上行发送质量， 依此来优化切换 目标选择， 从而可以减少 UE的切换失败率； 同时也可以及时发现邻区的覆 盖问题， 将覆盖问题反馈给部区， 以便邻区进行覆盖的优化调整。

Claims

权 利 要 求 书
1、 一种获取邻区上行信号质量的方法， 其包括: 服务基站根据所述邻区的参考信号功率和用户设备对邻区的测量上报结 果， 得到当前所述用户设备在所述邻区的下行传输路损， 将所述下行传输路 损作为用户设备在所述邻区的上行传输路损， 根据所述上行传输路损估算用 户设备在邻区的上行信号质量。
2、如权利要求 1所述的方法，其中，在得到所述下行传输路损的步骤前， 所述方法还包括： 所述邻区的参考信号功率由所述用户设备上报给服务基站， 或者， 所述邻区的参考信号功率由邻区所在基站通过 X2 口建立过程或演进的 基站配置更新过程通知服务基站， 其中， 在 X2 口建立或响应消息的服务小 区信息中包含所述邻区的参考信号功率， 或在演进的基站配置更新消息的服 务小区信息中包含所述邻区的参考信号功率。
3、如权利要求 1所述的方法， 其中， 在将所述下行传输路损作为用户设 备在所述邻区的上行传输路损的步骤后， 所述方法还包括： 如果所述用户设备在所述邻区的上行传输路损大于设定的第二阔值， 则 服务基站认为所述邻区的上行覆盖和下行覆盖不匹配， 所述服务基站通知所 述邻区所在基站覆盖异常。
4、 如权利要求 3所述的方法， 其还包括： 所述第二阔值由操作管理维护 （OAM ) 系统配置； 或者，
所述第二阔值由所述邻区所在基站通知所述服务基站。
5、 如权利要求 4所述的方法， 其中， 所述邻区所在基站通过如下方式将所述第二阔值通知给所述服务基站： 所述邻区所在基站通过 X2 口建立过程或者演进的基站配置更新过程通 知所述服务基站， 且在 X2 口建立或响应消息的服务小区信息中包含所述第 二阔值， 或演进的基站配置更新消息的服务小区信息中包含所述第二阔值。
6、 如权利要求 3所述的方法， 其还包括， 所述服务基站通知操作管理维护（OAM )系统所述邻区所在基站覆盖异 常。
7、 一种切换优化方法， 其包括： 用户设备的服务基站根据权利要求 1至 6所述的获取邻区上行信号质量 的方法估算用户设备在邻区的上行信号质量， 当用户设备在邻区的上行信号 质量不满足设定条件时， 服务基站将所述邻区作为切换的候选邻区， 而继续 选择其他符合条件的小区。
8、 如权利要求 7所述的切换优化方法， 其中， 所述设定条件为： 所述用户设备在所述邻区的上行传输路损大于设定的 第一阔值。
9、 如权利要求 8所述的切换优化方法， 其还包括： 所述第一阔值由操作管理维护（OAM ) 系统配置； 或者， 所述第一阔值 由所述邻区所在基站通知所述服务基站。
10、 如权利要求 9所述的切换优化方法， 其中， 所述邻区所在基站通过 如下方式将所述第一阔值通知给所述服务基站：
所述邻区所在基站通过 X2 口建立过程或者演进的基站配置更新过程通 知所述服务基站， 且在 X2 口建立或响应消息的服务小区信息中包含所述第 一阔值， 或演进的基站配置更新消息的服务小区信息中包含所述第一阔值。
11、一种基站，其包括下行传输路损获取模块和上行信号质量获取模块， 其中：
所述下行传输路损获取模块设置为： 根据所述邻区的参考信号功率和用 户设备对邻区的测量上报结果， 得到当前所述用户设备在所述邻区的下行传 输路损； 以及 上行信号质量获取模块设置为： 将所述下行传输路损获取模块得到的下 行传输路损作为用户设备在所述邻区的上行传输路损， 并根据所述上行传输 路损估算用户设备在邻区的上行信号质量。
12、 如权利要求 11所述的基站， 其中， 所述下行传输路损获取模块还设置为： 接收用户设备上报的所述邻区的 参考信号功率，或者， 自邻区所在基站通过 X2口建立过程发送的在 X2口建 立或响应消息的服务小区信息中获取所述邻区的参考信号功率， 或者自演进 的基站配置更新过程发送的配置更新消息的服务小区信息中获取所述邻区的 参考信号功率。
13、 如权利要求 11所述的基站， 其还包括异常检测通知模块， 其中： 所述异常检测通知模块设置为： 接收由操作管理维护（OAM )系统配置 的第二阔值， 或者接收所述邻区所在基站发送的第二阔值； 以及
值， 如果大于， 则所述邻区的上行覆盖和下行覆盖不匹配， 通知所述邻区所 在基站和 /或操作管理维护 （OAM ) 系统所述邻区所在基站覆盖异常。
14、 如权利要求 11所述的基站， 其还包括切换模块， 其中： 所述切换模块设置为： 当用户设备在邻区的上行信号质量不满足设定条 件时， 将所述邻区作为切换的候选邻区， 而继续选择其他符合条件的小区； 其中，
所述设定条件为： 所述用户设备在所述邻区的上行传输路损大于设定的 第一阔值。
15、 如权利要求 14所述的基站， 其中： 所述切换模块还设置为： 接收操作管理维护（OAM )系统配置的第一阔 值； 或者， 接收所述邻区所在基站发送的第一阔值。
PCT/CN2010/072045 2009-04-23 2010-04-22 一种获取邻区上行信号质量的方法和切换优化方法 WO2010121555A1 (zh)

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