WO2012010039A1 - 一种用于小区间干扰协调的用户管理方法及系统 - Google Patents

一种用于小区间干扰协调的用户管理方法及系统 Download PDF

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Publication number
WO2012010039A1
WO2012010039A1 PCT/CN2011/076268 CN2011076268W WO2012010039A1 WO 2012010039 A1 WO2012010039 A1 WO 2012010039A1 CN 2011076268 W CN2011076268 W CN 2011076268W WO 2012010039 A1 WO2012010039 A1 WO 2012010039A1
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user equipment
cell
user
information
type
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PCT/CN2011/076268
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English (en)
French (fr)
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赵刚
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/22Processing or transfer of terminal data, e.g. status or physical capabilities
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/18Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a user management method and system for inter-cell interference coordination. Background technique
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM systems Like traditional wireless cellular networks, OFDM systems also increase spectrum utilization by reducing the frequency reuse factor. Although the problem of interference in the cell (sector) of the OFDM system is well solved, as the frequency reuse factor decreases, the ICI (Inter-Cell Interference) increases due to the close position of the co-channel interference source. This makes the problem a major obstacle to the performance of OFDM systems.
  • the interference coordination of the OFDM system usually manages the interference type or location type of the UE (User Equipment), and performs different processing for different types of users.
  • the technical features of UE type division mainly include:
  • CQI Channel Quality Indicator
  • the ratio of the signal strength of the serving cell received by the UE to the signal strength of the neighboring cell as the basis for user division;
  • the UE is divided into edge users and central users, or add another center and edge. Users of the crossing area;
  • the main technical problem to be solved by the present invention is to provide a user management method and system for inter-cell interference coordination, which can effectively manage the UE type, so that the OFDM system can be different for different types of users according to its management situation.
  • the processing method is to effectively suppress the occurrence of interference.
  • the present invention provides a user management method for inter-cell interference coordination, which includes: acquiring cell information reported by a user equipment; and adjusting a type of the user equipment according to the cell information.
  • the cell information is from a serving cell and a neighboring cell where the user equipment is located; the cell information includes at least one of the following information: a channel quality indicator, pilot strength information, path loss information, and interference information.
  • the adjusting the type of the user equipment according to the cell information specifically includes: adjusting, according to the cell information, a type of the user equipment according to a preset criterion, where the preset criterion includes a following criterion or a combination of multiple criteria :
  • the first criterion is: calculating a communication quality balance parameter of the user equipment according to the cell information, comparing the communication quality balance parameter with a preset quality balance parameter threshold, and adjusting the user equipment type according to the comparison result;
  • the second criterion is: calculating, according to the cell information, a communication quality satisfaction parameter of the user equipment, comparing the communication quality satisfaction parameter with a preset quality to meet a parameter threshold, and adjusting the user equipment type according to the comparison result;
  • Criterion 3 Comparing the cell information of a single user equipment with a preset cell information parameter threshold and adjusting the user equipment type according to the comparison result.
  • the criterion further includes a criterion 4, where the criterion 4 includes: if the information reported by the serving cell of the user equipment and the information reported by the neighboring cell are less than the preset information threshold after being calculated according to the preset condition, the user equipment determines For special users.
  • the step of adjusting the type of the user equipment according to the cell information further includes: setting the initial type of the user equipment, specifically: performing: sorting, according to the cell information, the user equipment according to the user equipment The location in the ranking determines the initial type of the user equipment.
  • the present invention further provides a user management system for inter-cell interference coordination, comprising: an information acquisition module, configured to acquire cell information reported by a user equipment; and an adjustment module, configured to adjust the user according to the cell information The type of device.
  • the beneficial effects of the present invention are: adjusting the type of the user equipment according to the cell information reported by the user equipment and adjusting the type of the user equipment according to the cell information, so that the OFDM system can perform different processing methods for different types of users according to the management situation thereof. Interference coordination and system performance improvement provide effective support. DRAWINGS
  • Embodiment 1 is a schematic flow chart of Embodiment 1 of the method of the present invention.
  • Embodiment 2 is a schematic flow chart of Embodiment 2 of the method of the present invention.
  • Embodiment 3 is a schematic diagram of a user queue in Embodiment 2 of the method of the present invention.
  • FIG. 4 is a schematic diagram of determining an interference user that must be controlled in Embodiment 2 of the method of the present invention
  • FIG. 5 is a schematic flowchart of Embodiment 3 of the method of the present invention. detailed description
  • the present invention provides a user management method for inter-cell interference coordination in the LTE system. As shown in FIG. 1 , the flowchart of the first embodiment includes the following steps: Step 1. Get related information.
  • Related information includes CQI, RSRP (Reference Signal Receiving Power), path loss information, or interference information.
  • CQI CQI
  • RSRP Reference Signal Receiving Power
  • Step 2. Determine the initial type of the user.
  • Interference level set ⁇ interference level 1 user, interference level 2 user, ..., interference level N user ⁇ or user's address location set ⁇ location level 1 user, location level 2 user, ..., location level N user ⁇ , etc. Determine the initial proportion or number of different user equipment types and determine the initial type status after each user equipment accesses the network.
  • Step 3 Adjust the user type according to the preset criteria and the initial type of the user.
  • Pre-set criteria include, but are not limited to, a combination of one or more of the following criteria:
  • Guideline 1 Guidelines for quality of communication between various types of users. Communication quality includes information such as GBR ( Guaranteed Bit Rate), delay, and so on. Taking GBR as an example, the following processing can be performed: The base station calculates the GBR satisfaction rate of each type of user, and adjusts the proportion or number of users among various types according to the GBR satisfaction rate ratio threshold between various types.
  • GBR Guaranteed Bit Rate
  • Guideline 2 The quality of communication service for a single user satisfies the state criteria.
  • Communication quality includes information such as GBR, delay, and so on.
  • GBR GBR as an example, the GRB satisfaction rate of a single user can be calculated, and the calculation result is compared with a preset threshold to adjust the user type.
  • the interference level includes information such as SIR (Signal to Interference Power Ratio), SINR (Signal to Interference plus Noise Ratio), and IoT (Interference over Thermal Noise).
  • SIR Signal to Interference Power Ratio
  • SINR Signal to Interference plus Noise Ratio
  • IoT Interference over Thermal Noise
  • Guideline 4 Strict control principles for special users. Special users are users who generate high interference. The above-mentioned line interference is taken as an example. For users who have high interference to the neighboring cell, such as users who are at the edge of the cell and transmit at high power, they are special users who must control interference. Such users should be strictly limited to a particular type, for example The scheduling is strictly limited to a certain bandwidth to avoid high interference to the neighboring area.
  • the method of the present invention dynamically adjusts the UE type by the above steps, so that the OFDM system can perform different interference coordination processing for different types of users, and provide effective support for inter-cell interference coordination and system performance improvement.
  • the method of the present invention is exemplified below by three examples in a specific application.
  • Embodiment 2 of the method of the present invention which implements a user type division method for uplink semi-static interference coordination in an LTE system, which divides a user into a CEU (Cell Edge User). And the CCU (Cell Center User), and then adjust the user type according to the aforementioned criterion 1, that is, the balance state of the overall GBR satisfaction rate of the CEU and the CCU, the specific steps are as follows:
  • Step 201 the user accesses.
  • step 202 the user queue is adjusted and the initial type is selected.
  • the RRC (Radio Resource Control) layer calculates the average value or smoothness of the difference RSRP between the RSRP (RSRP srv ) of the local cell and the RSRP (RSRP ne i b ) of the neighboring cell according to the RSRP report information triggered by the A3 event.
  • RSRP srv RSRP srv - RSRP ne ib.
  • the RRC may also trigger the reporting information according to other events, or report the information periodically.
  • the MAC (Medium Media Access Control) layer is used to sort the RSRPs of the reported UEs.
  • the formed UE queue is called the RSRP queue.
  • the MAC ranks the SINRs of the non-upper UEs, and the formed UE queue is called the SINR queue.
  • the smaller the SINR value the closer to the edge.
  • the user equipment for example, the initial ratio or the number, determines the initial type of the user.
  • the user equipment in the RSRP queue is set to CEU according to the location of the access user in the queue, and the user equipment in the SINR queue is set. Set to CCU.
  • Step 203 Count the historical throughput rate of the user.
  • Historical throughput (1 - ) ⁇ historical throughput + ⁇ this ⁇ transport block size ⁇ 1000
  • the local transmission block is the transmission block of the current transmission time interval (valid time interval), usually in ms.
  • Step 204 Calculate the GBR satisfaction rate of the CEU and the CCU.
  • the GBR satisfaction rate formula for CEU can be as follows:
  • GBR bundles the GBR of the i-th CEU
  • W represents the service priority weight of the i-th edge UE
  • the CBR's GBR satisfaction rate formula can be as follows:
  • GBR j is the GBR of the jth CCU
  • N CCT / is the total number of ecu in the cell
  • f (Mj ) ⁇ M represents the average modulation order of the jth central user
  • M ⁇ wj represents the priority weight of the edge UE.
  • Step 205 adjust the user type. This step specifically includes the following:
  • CEUs are moved into the CCU collection.
  • CCUToCEUThr represents the threshold for the central user to move to the edge user, usually a real value greater than 0
  • CE6 OCO/7 ⁇ represents the threshold for the edge user to move to the central user, usually a real value greater than 0
  • S is greater than or equal to 1. Integer value.
  • the second embodiment of the present invention has ended.
  • the entire process of the second embodiment shown in Figure 2 can be started by the base station after the user accesses the network.
  • the OFDM system can perform different processing according to different types of users when performing interference coordination.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • FIG. 5 it is a schematic flowchart of Embodiment 3 of the method of the present invention, and the same is implemented.
  • the method embodiment divides the user into CEU and CCU, and then jointly adjusts the user according to the foregoing criterion 2, that is, the GBR satisfaction rate and the signal-to-noise ratio (SINR) of the single user.
  • the specific steps of the method are as follows, wherein steps 301-303 are the same as steps 201 ⁇ 203 described above:
  • Step 301 the user accesses.
  • step 302 the user queue is adjusted and the initial type is selected.
  • the RRC may also trigger the reporting information according to other events, or trigger the reporting information periodically according to the event.
  • the MAC layer sorts the RSRPs with the reported UEs.
  • the formed UE queue is called an RSRP queue.
  • the smaller the RSRP value the closer to the edge.
  • the MAC ranks the SINRs of the non-reporting UEs, and the formed UE queue is called the SINR queue.
  • the smaller the SINR value the closer to the edge.
  • the initial type of the user is determined according to a preset type of user equipment, such as an initial ratio or a number.
  • the user located in the RSRP queue is located according to the location of the access user in the queue. Set the device to CEU and set the user equipment in the SINR queue to CCU.
  • Step 303 Count the historical throughput rate of the user.
  • Historical throughput (1 - ) ⁇ historical throughput + ⁇ this ⁇ transport block size ⁇ 1000
  • the local transmission block is the current transmission time interval (Transmission Time Interval), usually in ms.
  • Step 304 Calculate a GBR satisfaction rate of a single user equipment.
  • T GBR (representing the GBR satisfaction rate of UE(i) (ie, the i-th UE),
  • the GBR beam indicates the GBR of the i-th CEU.
  • Step 305 adjust the user type. This step specifically includes the following:
  • KJ GBR CCU [CEU, (T GBR (i) ⁇ GBRThresholdCCU) & (S Luo (' ⁇ ) ⁇ SINRThresholdCCU)
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the fourth embodiment of the method of the present invention is another implementation manner of the third embodiment.
  • the embodiment also divides the user into CEU and CCU, and then according to the foregoing criterion 2, that is, the GBR satisfaction rate and the signal-to-noise ratio (SINR) of the single user.
  • the specific steps of the method are as follows: Step 401, user access.
  • the user queue is adjusted and the initial type is selected.
  • the MAC layer calculates the path loss value of the local cell for the PHR with the reported UE, and sorts the path loss value.
  • the formed UE queue is called the path loss value sorting queue. The larger the path loss value is, the closer it is to the edge. Then, according to the user equipment of the access network, The location in the queue determines the initial type of user equipment.
  • Steps 403-405 are the same as steps 303-305 of the foregoing third embodiment, and are not described herein again. So far, the fourth embodiment of the present invention has ended. Similarly, the entire process of Embodiment 4 can be initiated by the base station after the user accesses the network.
  • the user type management can also be performed by referring to the foregoing embodiment, and details are not described herein again.
  • the present invention further provides a user management system for inter-cell interference coordination, comprising: an information acquisition module, configured to acquire signal information received by a user equipment from a serving cell and a neighboring cell; And determining, according to the acquired signal information, an initial type of the user equipment, and an adjusting module, configured to adjust a type of the user equipment according to an initial type of the user equipment and a preset criterion.
  • the system embodiment further includes an initialization module, configured to sort the user equipment according to the cell information, and determine an initial type of the user equipment according to the location of the user equipment in the sorting.
  • the embodiment of the present invention solves the problem of semi-static coordination of inter-cell interference existing in the prior art, and analyzes inter-cell interference information, and combines resource scheduling and power control modes to solve the inter-cell problem simply and effectively.
  • Interference coordination problem which is managed according to the user's interference type or location type, enables the OFDM system to perform different processing according to different types of users during interference coordination, thereby playing an obvious beneficial role for the implementation and promotion of the OFDM system. .

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Description

一种用于小区间干扰协调的用户管理方法及系统 技术领域
本发明涉及无线通信技术领域, 尤其涉及一种用于小区间干扰协调的 用户管理方法及系统。 背景技术
作为新一代无线通信技术的标志, OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用)在无线通信系统的发展中越来越彰 显其优势, 并被多种标准所釆纳。 OFDM 系统的主要技术优势在于: 频谱 效率高, 带宽扩展性强, 抗多径衰落能力强, 便于灵活分配频谱资源, 便 于实现 MIMO ( Multiple-Input Multiple-Out-put, 多输入多输出)或者空间 多样技术等。
和传统的无线蜂窝网络相同, OFDM 系统也通过降低频率复用因子的 方式提高频谱利用率。 虽然 OFDM系统的小区 (扇区) 内干扰的问题得到 很好的解决, 但随着频率复用因子的降低, ICI ( Inter-Cell Interference, 小 区间干扰) 由于同频干扰源位置的接近而增加, 使该问题成为制约 OFDM 系统性能的主要障碍。
为了有效抑制干扰的发生, OFDM系统的干扰协调通常会对 UE ( User Equipment, 用户设备) 的干扰类型或位置类型进行管理, 针对不同类型的 用户进行不同的处理。
目前, UE类型划分的技术特点主要包括:
1、 釆用 CQI ( Channel Quality Indicator, 信道质量指示)或 UE接收到 的服务小区信号强度和邻小区信号强度的比值等作为用户划分的依据;
2、 UE被划分为边缘用户和中心用户, 或者再增加一种中心和边缘过 渡区的用户;
3、 各种用户的比例或划分用户类型的门限值相对固定, 无法根据系统 变化做出灵活的调整。 发明内容
本发明要解决的主要技术问题是, 提供一种用于小区间干扰协调的用 户管理方法及系统, 能够有效地对 UE类型进行管理, 使得 OFDM系统可 以根据其管理情况针对不同类型的用户进行不同的处理方法, 从而有效抑 制干扰的发生。
为解决上述技术问题, 本发明提供一种用于小区间干扰协调的用户管 理方法, 包括: 获取用户设备上报的小区信息; 根据所述小区信息调整所 述用户设备的类型。
所述小区信息来自所述用户设备所在的服务小区和相邻小区; 所述小 区信息至少包括以下信息之一: 信道质量指示、 导频强度信息、 路损信息、 干扰信息。
所述根据所述小区信息调整所述用户设备的类型具体包括: 根据所述 小区信息按预设准则调整所述用户设备的类型, 所述预设准则包括如下一 种准则或多种准则的组合:
准则一: 根据所述小区信息计算用户设备的通信质量平衡参数, 将所 述通信质量平衡参数与预设的质量平衡参数门限进行比较并根据比较结果 来调整用户设备类型;
准则二: 根据所述小区信息计算用户设备的通信质量满足参数, 将所 述通信质量满足参数与预设的质量满足参数门限进行比较并根据比较结果 来调整用户设备类型;
准则三: 将单个用户设备的小区信息与预设的小区信息参数门限值进 行比较并根据比较结果来调整用户设备类型。 所述准则还包括准则四, 所述准则四包括: 如果用户设备的服务小区 上报的信息与相邻小区上报的信息按预设条件计算后小于预设信息门限 值, 则所述用户设备确定为特殊用户。
上述根据所述小区信息调整所述用户设备的类型这一步骤之前还包括 设置用户设备的初始类型, 具体包括: 根据所述小区信息将所述用户设备 进行排序, 并根据所述用户设备在所述排序中的位置确定所述用户设备的 初始类型。
相应地, 本发明还提供一种用于小区间干扰协调的用户管理系统, 包 括: 信息获取模块, 用于获取用户设备上报的小区信息; 调整模块, 用于 根据所述小区信息调整所述用户设备的类型。
本发明的有益效果是: 通过获取的用户设备上报的小区信息并根据小 区信息调整所述用户设备的类型, 使得 OFDM系统可以根据其管理情况针 对不同类型的用户进行不同的处理方法, 为小区间干扰协调和系统性能的 提升提供有效支撑。 附图说明
图 1是本发明方法实施例一的流程示意图;
图 2 是本发明方法实施例二的流程示意图;
图 3 是本发明方法实施例二中用户队列的示意图;
图 4 是本发明方法实施例二中确定必须控制的干扰用户的示意图; 图 5 是本发明方法实施例三的流程示意图。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
本发明针对 LTE系统提出了一种用于小区间干扰协调的用户管理方法 实施例一, 如图 1所示, 为该实施例一的流程示意图, 包括以下步骤: 步骤 1 , 获取相关信息。
相关信息包括 CQI、 RSRP ( Reference Signal Receiving Power, 参考信 号接收功率)、 路损信息或干扰信息。
步骤 2, 确定用户的初始类型。
对获取到的相关信息做排序处理, 形成干扰水平从高到低或者地理位 置从远到近或者路损大小从大到小的 UE队列,根据这些队列将用户划分为 N种类型 ,例如用户的干扰水平集合{干扰水平 1用户,干扰水平 2用户, ..., 干扰水平 N用户 }或用户的地址位置集合{位置水平 1用户, 位置水平 2用 户, …, 位置水平 N用户 }等; 设定不同用户设备类型的初始比例或数目, 并决定每种用户设备接入网络后的初始类型状态。
步骤 3 , 根据预设准则与用户的初始类型来调整用户类型。
预设准则包括但不限于如下一项或多项准则的组合:
准则一: 各种类型用户间通信服务质量平衡准则。 通信质量包括 GBR ( Guaranteed Bit Rate, 保证比特率)、 时延等信息。 以 GBR为例, 可做如 下处理: 基站计算每种类型用户的 GBR满足率, 根据各种类型间的 GBR 满足率比值门限来调节各种类型间的用户比例或数目。
准则二: 单个用户的通信服务质量满足状态准则。通信质量包含 GBR、 时延等信息。 以 GBR为例, 可计算单个用户的 GRB满足率, 将计算结果 与预设门限值进行比较来调整用户类型。
准则三: 单个用户的干扰水平准则。 干扰水平包含 SIR ( Signal to Interference Power Ratio, 信干比 )、 SINR ( Signal to Interference plus Noise Ratio, 信干噪比)、 IoT ( Interference over Thermal noise )等信息, 以 SINR 为例, 计算用户在一段时间 (该周期通常以 ms为单位) 内的 SINR平均值 或者平滑值, 将计算结果与预设门限值进行比较来调整用户类型。
准则四: 特殊用户严格控制原则。 特殊用户是指产生高干扰的用户, 以上行干扰为例, 对于会对邻小区产生高干扰的用户, 比如处于小区边缘 且高功率发射的用户, 则为必须控制干扰的特殊用户, 这类用户应严格限 制在某特殊类型中, 例如将其调度严格限制在某段带宽内, 以避免对邻区 造成高干扰。
本发明方法通过如上步骤动态地调整 UE类型, 使得 OFDM系统可以 针对不同类型的用户进行不同的干扰协调处理, 为小区间干扰协调和系统 性能的提升提供有效支撑。 下面通过具体应用中的三个实例对本发明方法 进行示例性说明。
如图 2所示, 为本发明方法实施例二的流程示意图, 实现了一种针对 LTE 系统上行半静态干扰协调的用户类型划分方法, 该方法将用户划分为 CEU ( Cell Edge User, 小区边缘用户)和 CCU ( Cell Center User, 小区中 心用户 ), 然后根据前述准则一, 即 CEU和 CCU整体 GBR满足率的平衡 状态, 来调整用户类型, 具体步骤如下:
步骤 201 , 用户接入。
步骤 202, 调整用户队列并选择初始类型。
RRC ( Radio Resource Control, 无线资源控制)层根据 A3事件触发的 RSRP上报信息, 计算上报 UE的本小区 RSRP ( RSRPsrv )与邻小区 RSRP ( RSRPneib ) 的差值 RSRP 的平均值或平滑值, 即 RSRP = RSRPsrv - RSRPneib。
本实施例中 RRC也可以根据其他事件触发上报信息, 或者事件触发周 期地上报信息。
MAC ( Medium Access Control, 媒体介质访问控制)层对具有上报 UE 的 RSRP排序, 形成的 UE队列称为 RSRP队列, RSRP值越小越靠近 边缘。 同时 MAC对非上 UE的 SINR排序, 形成的 UE队列称为 SINR 队列, SINR值越小越靠近边缘。 如图 3所示, 按照事先设定的不同类型用 户设备范围, 例如初始比例或数目来确定用户初始类型, 本实施例中根据 接入用户在队列中所处的位置,将位于 RSRP队列的用户设备设定为 CEU, 将位于 SINR队列的用户设备设定为 CCU。
步骤 203 , 统计用户的历史吞吐率。
根据如下公式进行统计:
历史吞吐率 = (1 - )·历史吞吐率 + ·本 ΤΤΙ传输块大小 · 1000
其中, 为滤波因子, 本 ΤΤΙ传输块为当前 ΤΤΙ ( Transmission Time Interval, 传输时间间隔) 的传输块, 通常以 ms为单位。
步骤 204, 计算 CEU和 CCU的 GBR满足率。
CEU的 GBR满足率公式可以为如下:
Figure imgf000007_0001
其中,
表示第 i个 CEU的历史吞吐率,
GBR束示第 i个 CEU的 GBR,
£[/表示本小区内 CEU的总数, f(Mi ) =― , Μ表示第 i个边缘用户的信道质量相关参数,
W表示第 i个边缘 UE的业务优先级权重,
表示 /(Μ,.)是否使能的因子, 0表示不使能, 1表示使能。
CCU的 GBR满足率公式可以为如下:
Figure imgf000007_0002
其中, 是第 j个 CCU的历史吞吐率,
GBRj为第 j个 CCU的 GBR, NCCT/为本小区内 ecu的总数, f(Mj )丄, M表示第 j个中心用户的平均调制阶数,
M〗 wj表示边缘 UE的业务优先级权重,
表示 /TM J是否使能的因子, 0表示不使能, 1表示使能。
步骤 205 , 调整用户类型。 该步骤具体包括如下:
1、 如果 Tgbr-ceu > CCUToCEUThr , 则将 CCU集合中最左边 S个 CCU移
1 τ GBR CCU 动到 CEU集合中; 如果 Tgbr-ceu≤ CEUToCCUThr , 则将 CEU集合中最右边 S
1 τ GBR CCU
个 CEU移动到 CCU集合中。 其中, CCUToCEUThr表示中心用户向边缘用 户移动的门限, 通常为大于 0 的实数值; CE6 OCO/7 ^表示边缘用户向中 心用户移动的门限, 通常为大于 0的实数值; S为大于等于 1的整数值。
2、 确定必须控制干扰的特殊用户。 在上述 RSRP队列中, 如果 UE的 RSRP 值小于一个预设的门限值 RSRPMustStaylnEdge , ^ A RSRP < RSRPMustStaylnEdge, 说明则将该 UE非常靠近小区的边缘位置, 如果给 该 UE分配了中心频带, 则对邻小区造成高干扰的概率很高。 因此, 必须将 该 UE的调度严格限制在边缘专用频带中, 如图 4所示, 本实施例将位于 RSRP队列中其 RSRP < RSRPMustStaylnEdge范围的 CEU确定为必须控 制干扰的特殊用户。
至此, 本发明的实施例二结束。 图 2 所示实施例二的整个流程可以通 过基站在用户接入网络后启动。 根据用户的干扰类型或位置类型进行管理 后, 使得 OFDM系统能够在进行干扰协调时根据不同类型的用户进行不同 的处理。
实施例三:
如图 5 所示, 为本发明方法实施例三的流程示意图, 同样实现了一种 针对 LTE系统上行半静态干扰协调的用户类型划分, 该方法实施例将用户 划分为 CEU和 CCU, 然后根据前述准则二, 即单个用户的 GBR满足率和 信噪比(SINR ), 来联合调整用户类型, 该方法的具体步骤如下, 其中步骤 301-303与前述步骤 201~203雷同:
步骤 301 , 用户接入。
步骤 302, 调整用户队列并选择初始类型。
RRC层根据 A3事件触发的 RSRP上报信息, 计算上报 UE的本小区 RSRP ( RSRPsrv )与邻小区 RSRP ( RSRPneib )的差值 RSRP的平均值或平 滑值, 即 RSRP = RSRPsrv - RSRPneib
本实施例中 RRC也可以根据其他事件触发上报信息, 或者周期地根据 事件触发上报信息。
MAC层对具有上报 UE的 RSRP排序, 形成的 UE队列称为 RSRP 队列, RSRP值越小越靠近边缘。 同时 MAC对非上报 UE的 SINR排序, 形成的 UE队列称为 SINR队列, SINR值越小越靠近边缘。 如图 3所示, 按照事先设定的不同类型用户设备范围, 例如初始比例或数目来确定用户 初始类型, 本实施例中根据接入用户在队列中所处的位置, 将位于 RSRP 队列的用户设备设定为 CEU, 将位于 SINR队列的用户设备设定为 CCU。
步骤 303 , 统计用户的历史吞吐率。
根据如下公式进行统计:
历史吞吐率 = (1 - )·历史吞吐率 + ·本 ΤΤΙ传输块大小 · 1000
其中, 为滤波因子, 本 ΤΤΙ传输块为当前 ΤΤΙ ( Transmission Time Interval, 传输时间间隔)传输块, 通常以 ms为单位。
步骤 304, 计算单个用户设备的 GBR满足率。
公式可以为如下:
GBR o '= GBR, 其中,
TGBR( 表示 UE(i) (即第 i个 UE ) 的 GBR满足率,
表示第 i个 CEU的历史吞吐率,
GBR束示第 i个 CEU的 GBR。
步骤 305 , 调整用户类型。 该步骤具体包括如下:
1、 如果 UE(i)的当前类型为 CEU, 则根据下式做类型转换:
iCEU, TGBR (i)≤ GBRThresholdCEU
KrFU (i) = <
[CCU, (TGBR (0 > GBRThresholdCEU) & (S/NR( ) > SINRThresholdCCU)
2、 如果 UE(i)的当前类型为 CCU, 则根据下式做类型转换:
\CCU, Trm (i) > GBRThresholdCCU
K J GBR CCU ~ [CEU, (TGBR (i) < GBRThresholdCCU) & (S羅 ('·) < SINRThresholdCCU)
3、 确定必须控制干扰的特殊用户。 在上述 RSRP队列中, 如果 UE的 ^ RSRP 值小于一个预设的门限值 RSRPMustStaylnEdge , ^ A RSRP < RSRPMustStaylnEdge, 说明则将该 UE非常靠近小区的边缘位置, 如果给 该 UE分配了中心频带,则对邻小区造成高干扰的概率很高。 因此必须将该 UE的调度严格限制在边缘专用频带中,如图 4所示,本实施例将位于 RSRP 队列中其 RSRP < RSRPMustStaylnEdge范围的 CEU确定为必须控制干扰 的特殊用户。
至此, 本发明的实施例二结束。 同样地, 图 5 所示实施例二的整个流 程可以通过基站在用户接入网络后启动。
实施例四:
本发明方法实施例四为实施例三的另一种实现方式, 该实施例同样将 用户划分为 CEU和 CCU, 然后根据前述准则二, 即单个用户的 GBR满足 率和信噪比 (SINR ), 来联合调整用户类型, 该方法的具体步骤如下: 步骤 401 , 用户接入。
步骤 402, 调整用户队列并选择初始类型。 MAC层对具有上报 UE的 PHR计算本小区路损值,对路损值排序, 形 成的 UE队列称为路损值排序队列,路损值越大越靠近边缘; 然后根据接入 网络的用户设备在队列中所处的位置确定用户设备的初始类型。
步骤 403~405与前述实施例三的步骤 303~305相同, 此处不再赘述。 至此, 本发明的实施例四结束。 同样地, 实施例四的整个流程可以通 过基站在用户接入网络后启动。
对于前述的其他准则及相关的信号信息, 同样可以参考前述实施例进 行用户类型的管理, 此处不再赘述。
本发明相应地还提供了一种用于小区间干扰协调的用户管理系统, 包 括: 信息获取模块, 用于获取用户设备上报的其接收到的来自服务小区和 相邻小区的信号信息; 初始化模块, 用于根据获取的所述信号信息确定所 述用户设备的初始类型; 调整模块, 用于根据所述用户设备的初始类型以 及预设准则调整所述用户设备的类型。 一种系统实施例中还包括初始化模 块, 用于根据所述小区信息将所述用户设备进行排序, 并根据所述用户设 备在所述排序中的位置确定所述用户设备的初始类型。 各模块之间的具体 处理与计算参见前述方法实施例, 此处不再赘述。
通过上述实施例可见, 本发明实施例解决现有技术中存在的小区间干 扰的半静态协调问题, 通过对小区间干扰信息进行分析, 结合资源调度和 功率控制方式, 简单有效地解决了小区间干扰协调问题, 其根据用户的干 扰类型或位置类型进行管理后, 使得 OFDM系统能够在进行干扰协调时根 据不同类型的用户进行不同的处理, 从而为 OFDM系统的实施和推广起到 明显的有益作用。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明, 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说, 在不脱离本发明构思的前提下, 还可以做出若干简单 „
WO 2012/010039
推演或替换, 都应当视为属于本发明的保护范围

Claims

权利要求书
1、 一种用于小区间干扰协调的用户管理方法, 其特征在于, 包括: 获取用户设备上报的小区信息;
根据所述小区信息调整所述用户设备的类型。
2、 如权利要求 1所述的方法, 其特征在于, 所述小区信息来自所述用 户设备所在的服务小区和相邻小区; 所述小区信息至少包括以下信息之一: 信道质量指示、 导频强度信息、 路损信息、 干扰信息。
3、 如权利要求 1所述的方法, 其特征在于, 所述根据所述小区信息调 整所述用户设备的类型具体包括: 根据所述小区信息按预设准则调整所述 用户设备的类型, 所述预设准则包括如下一种准则或多种准则的组合: 准则一: 根据所述小区信息计算用户设备的通信质量平衡参数, 将所 述通信质量平衡参数与预设的质量平衡参数门限进行比较并根据比较结果 来调整用户设备类型;
准则二: 根据所述小区信息计算用户设备的通信质量满足参数, 将所 述通信质量满足参数与预设的质量满足参数门限进行比较并根据比较结果 来调整用户设备类型;
准则三: 将单个用户设备的小区信息与预设的小区信息参数门限值进 行比较并根据比较结果来调整用户设备类型。
4、 如权利要求 3所述的方法, 其特征在于, 在所述准则一中, 所述根 据所述小区信息计算用户设备的通信质量平衡参数具体包括:
计算小区边缘用户的通信质量平衡参数的计算公式为:
T, GBR CEU
NCEU ieCEU GBR, 其中, 表示第 i个小区边缘用户的历史吞吐率, G^?,.表示第 i个小区 边缘用户的保证比特率, NC£[/表示小区边缘用户的总数, 肌) =上, Μ,.表 示第 i个小区边缘用户的信道质量参数, W表示第 i个小区边缘用户的业务 优先级权重, 表示/ (M 的使能因子, 0表示不使能, 1表示使能;
小区中心用户的通信质量平衡参数的计算公式为:
Figure imgf000014_0001
其中, 是第 j个小区中心用户的历史吞吐率, 为第 j个小区中心 用户的保证比特率, NCCT/为小区中心用户的总数, βΜ )丄, M表示第 j
M〗
个小区中心用户的平均调制阶数, 表示小区中心用户的业务优先级权重, k表示 /TM J的使能因子, 0表示不使能, 1表示使能;
所述将所述通信质量平衡参数与预设的质量平衡参数门限进行比较并 比较结果来调整用户设备类型具体包括: 如果 ≥ CCUToCEUThr ,则将至少一个小区中心用户调整为小区边
Τ
1 GBR CCU
缘用户, 其中 CCUToCEUThr表示小区中心用户向小区边缘用户移动的门限; 如果 Tgbr-ceu < CEUToCCUThr ,则将至少一个小区边缘用户调整为小区中
Τ
1 GBR CCU
心用户, 其中 CEUToCCUThr表示 d、区边缘用户向小区中心用户移动的门限。
5、 如权利要求 3所述的方法, 其特征在于, 所述准则二中, 所述根据 所述小区信息计算用户设备的通信质量满足参数这一步骤具体包括:
GBR o '= GBR, 其中, rei¾(0表示第 i个用户设备的保证比特率的满足率, 表示第 i 个用户设备的历史吞吐率, 表示第 i个用户设备的保证比特率;
所述准则二中将所述通信质量满足参数与预设的质量满足参数门限进 行比较并根据比较结果来调整用户设备类型具体包括:
如果所述第 i个用户设备的当前类型为小区边缘设备,则根据下式调整 类型:
iCEU, TGBR (i)≤ GBRThresholdCEU
KrFU (i) = <
[CCU, (TGBR (0 > GBRThresholdCEU) & (S/NR( ) > SINRThresholdCCU) 如果所述第 i个用户设备的当前类型为小区中心设备,则根据下式调整 类型:
\CCU, Trm (i) > GBRThresholdCCU
K J GBR CCU ~ [CEU, (TGBR (i) < GBRThresholdCCU) & (S羅 ('·) < SINRThresholdCCU)
6、 如权利要求 3所述的方法, 其特征在于, 所述准则还包括准则四, 所述准则四包括: 如果用户设备的服务小区上报的信息与相邻小区上报的 信息按预设条件计算后小于预设信息门限值, 则所述用户设备确定为特殊 用户。
7、 如权利要求 1-6任一所述的方法, 其特征在于, 所述根据所述小区 信息调整所述用户设备的类型这一步骤之前还包括设置用户设备的初始类 型, 具体包括: 根据所述小区信息将所述用户设备进行排序, 并根据所述 用户设备在所述排序中的位置确定所述用户设备的初始类型。
8、 如权利要求 7所述的方法, 其特征在于, 所述根据所述小区信息将 所述用户设备进行排序, 并根据所述用户设备在所述排序中的位置确定所 述用户设备的初始类型具体包括:
所述小区信息为导频强度信息和干扰信息;
将用户设备上报的导频强度信息进行排序形成从高到低的第一用户设 备队列, 将用户设备的干扰信息进行排序形成从高到低的第二用户设备队 列;
按预设范围将处于预设范围内的所述第一用户设备队列确定其初始类 型为第一初始类型, 将处于预设范围外的所述用户设备队列确定其初始类 型为第二初始类型。
9、 一种用于小区间干扰协调的用户管理系统, 其特征在于, 包括: 信 息获取模块, 用于获取用户设备上报的小区信息; 调整模块, 用于根据所 述小区信息调整所述用户设备的类型。
10、 如权利要求 9所述的系统, 其特征在于, 所述系统还包括: 初始 化模块, 用于根据所述小区信息将所述用户设备进行排序, 并根据所述用 户设备在所述排序中的位置确定所述用户设备的初始类型。
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