WO2009135428A1 - 一种lte系统中为用户设备ue进行切换的方法和装置 - Google Patents

一种lte系统中为用户设备ue进行切换的方法和装置 Download PDF

Info

Publication number
WO2009135428A1
WO2009135428A1 PCT/CN2009/071615 CN2009071615W WO2009135428A1 WO 2009135428 A1 WO2009135428 A1 WO 2009135428A1 CN 2009071615 W CN2009071615 W CN 2009071615W WO 2009135428 A1 WO2009135428 A1 WO 2009135428A1
Authority
WO
WIPO (PCT)
Prior art keywords
handover
base station
cause value
switching
frequency
Prior art date
Application number
PCT/CN2009/071615
Other languages
English (en)
French (fr)
Inventor
汤斌淞
奥鲁佛松·亨里克
罗伯茨·迈克尔
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2009135428A1 publication Critical patent/WO2009135428A1/zh

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to user equipment (UE, User
  • the ping-pong effect term in Project is used to describe unnecessary over-frequency cell switching (HO, Hando ver). Under certain circumstances
  • the UE may switch from one cell to another and then switch back again. This situation is still considered normal if the high frequency does not occur very quickly, but the handover rate is high in the following scenarios, which means that the UE stays in the cell for a short time and increases the signaling compounding amount. The risk of failure of the system (switching) is large.
  • the mobility processing is performed by a Radio Network Controller (RNC).
  • RNC controls the base station (NodeB), and each base station has many cells. Therefore, the RN C can control the UE and handle the mobility problem of the UE over a large geographical range.
  • the handover algorithm and related data of the UE are stored in the RNC, and the RNC can thereby detect and mitigate the problem of ping-pong handover.
  • the mobility of the UE is handled by the base station eNodeB in the RAN, and therefore the UE between the eNodeBs in the LTE network
  • the UE history information of the process is directly transmitted between the eNodeBs through the X2 interface, or is forwarded through the core network through the S1 interface between the eNodeBs to meet the needs of the handover process, as shown in FIG. 2.
  • a method for reducing ping-pong handover by transmitting UE history information in the prior art is: adding frequency information of a cell to the UE history information, but even if the frequency information is added to the UE history information, only Obtaining the historical information of the UE switching at different frequency layers, due to the complexity of the handover reason, the eNodeB still cannot identify the potential cause of the different eNodeB different frequency handover.
  • the ping-pong switch has not been fully tempered.
  • a problem to be solved by embodiments of the present invention is to provide a method and apparatus for handover of a user equipment UE
  • a method for selecting a handover policy for a user equipment UE in a LTE system includes the following steps:
  • the base station performs statistical analysis on the historical information of the UE of the user equipment, where the historical information includes a value of the UE handover;
  • the base station performs a handover policy selection for the UE according to the statistical analysis result of the data of the handover cause value.
  • a base station in a long-term evolution LTE system comprising the following modules,
  • a user equipment configured to store historical information of the UE, where the historical information includes: a handover cause value;
  • the handover policy selection module is configured to perform handover policy selection for the UE according to the statistical analysis result of the handover cause value.
  • the proposed technical solution of the embodiment of the present invention has the following advantages: increasing the handover cause value in the history information used for the UE handover, so that each handover performed by the UE can comprehensively consider various situations of the handover cause, and Reasonable switching, thereby reducing the frequency of ping-pong switching.
  • Figure 1 is a prior art UMTS architecture diagram
  • FIG. 2 is a diagram of a prior art LTE architecture
  • FIG. 3 is a schematic diagram of a picocell overlapping microcell
  • FIG. 4 is a schematic diagram of handover of a UE between two different frequency layers of different traffic
  • FIG. 5 is a flow chart for general description of an embodiment of the present invention.
  • Figure 6 is a flow chart of a first embodiment of the present invention.
  • FIG. 7 is a structural diagram of a base station according to a fourth embodiment of the present invention.
  • the embodiment of the present invention adds a handover cause value to the UE history information, where the handover cause value is added by the source cell to the UE history information.
  • the switching cause value mainly describes the reason for performing the inter-frequency switching. The specific reasons are as follows:
  • Coverage-induced handover The UE may still camp on the source cell to obtain service, but the handover will be beneficial to obtain better wireless air interface conditions. That is, switching can be performed in consideration of better switching conditions of the target cell. Specifically, the following two situations are included: The coverage may be different frequency handover, the UE may still obtain the service in the source cell, but the handover will be beneficial to obtain a better inter-frequency wireless air interface condition; the coverage of the same frequency handover, the UE may still be at the source The cell gets the service, but the handover will be beneficial to get better intra-frequency wireless air interface conditions.
  • the UE may still camp on the source cell to obtain the service, but if the handover is made, other specific services may be obtained, that is, the "cause value" has indication information of the service indication, indicating that the occurrence of the target cell handover may cause the UE to obtain other specific services.
  • the UE may still camp on the source cell to obtain the service, but if the handover is performed, the frequency of the high-speed handover may be reduced, that is, the "cause value" has the indication information of the high-speed handover, indicating that the occurrence of the target cell handover may cause the UE to reduce the frequency of the high-speed handover.
  • the UE is switched to a larger cell layer, for example, from a micro cell layer to a lj macro cell layer.
  • Cell macro cell eNodeB will switch UE to low speed micro
  • the UE may still camp on the source cell to obtain the service, but if the handover is performed, the frequency of the high-speed handover may be reduced, that is, the "cause value" has the indication information of the high-speed indication, indicating that the occurrence of the target cell handover may cause the UE to reduce the frequency of the high-speed handover.
  • the UE is switched to a larger cell layer, for example, from micro zj, micro cell to macro cell macro cello.
  • the mobility parameter adjustment and the distributed mobility parameter adjustment are two methods to adjust the mobility parameters.
  • the mobility parameter may be a bias (Qoffset) of the pilot strength Ec/Io, and the offset value may be adjusted to perform early switching or late switching on the UE; or the mobility parameter may be Qoffset, antenna orientation, antenna Downtilt angle, a combination of any one or several of the output power of the base station.
  • the centralized mobility parameter is adjusted to the historical information collected by the eNodeB, and the historical information is forwarded to the central processing node self-organizing/self-optimizing network SON (Self-Organized/Optimizing)
  • SON Self-Organized/Optimizing
  • the central processing node performs parameter configuration based on the history information.
  • the distributed mobility parameter adjustment adjusts the mobility parameter for the eNodeB, which is often referred to as mobility parameter adjustment.
  • RRM Radio Resource Management
  • the reason values carried in the optimization are managed to obtain appropriate judgment results.
  • the handover process of the UE is used as a description basis: [41]
  • the entire handover procedure generally includes four steps of measurement-report-decision-execution. That is, when the radio condition changes, the UE measures the neighboring cell, and sends a measurement report including the neighbor cell information to the base station to which the UE belongs, and the base station makes a decision according to the measurement report, and determines that the UE performs handover to the target cell, according to the target.
  • the identifier of the cell is exchanged for information, and the resource preparation of the target cell is completed; then, the base station to which the UE belongs sends a handover command to the UE; the UE disconnects from the source cell according to the handover command, starts synchronization to the target cell, and starts transmitting on the target cell. Receiving user data, the source base station to which the UE belongs releases the radio resource of the source cell, and the handover is completed.
  • the embodiment mainly illustrates that, in the handover process, the source base station selects a handover policy for the UE by analyzing the historical information, and further, the eNodeB forwards the history information of the UE, for example, the source base station to the UE.
  • the historical information and the statistical analysis result of the data are sent to the target base station, and the target base station may also select a suitable target cell as the source base station according to the statistical analysis result and the historical information of the data.
  • the decision is made for reference.
  • the source base station and the target base station may be transmitted through the X2 interface, or the source base station and the target base station are transmitted through the core network through the S1 interface to meet the needs of the handover process.
  • the source base station to which the UE belongs sends a measurement control message to the target base station, and the specific message type may be Meas urement Control
  • the UE sends a measurement report to the source base station, which may be measurement
  • the source base station performs handover policy selection according to the measurement report sent by the UE and the UE history information stored for the handover preparation.
  • the historical information includes the cause value of the UE handover, and the source base station performs statistical analysis according to data of different reason values, and correspondingly adopts different policies to switch the UE.
  • the specific situation and corresponding strategies are as follows:
  • the corresponding policy may be: reducing the number of handovers by changing the mobility parameter, for example, changing the size of the cell coverage. Rather than changing its frequency, ie inter-frequency switching, this may increase the system call drop rate.
  • the operator can statistically analyze the historical record of the UE through the OAM/SON node, and perform statistics on the switching frequency, and improve the coverage by changing the transmission power, changing the antenna tilt angle, increasing the relay, or increasing the number of cells.
  • the source base station may select to switch the UE to the target cell whose coverage signal is better than the local cell.
  • the cause value in the history information indicates that the urgency causes the switching frequency to be high. Then, the UE is initially in a poor coverage cell. If the switching of this reason occurs multiple times, it means that the user's current service area signal is poor. While the urgency of this geographic area results in more handovers, operators can improve coverage by changing transmission power, changing antenna tilt, increasing trunking, or increasing the number of cells. In addition, in the case that the source cell is about to drop, the base station needs to decide to immediately switch to the UE.
  • the corresponding strategy may be to reduce the traffic balance across the frequency layer, which will cause some imbalance of system traffic. However, the number of total inter-frequency handovers will be reduced; or, the UEs in the idle state (Idle) can be balanced as much as possible, and the UEs in the Idle state are equalized by the mobility parameter changes in the system message broadcast. In addition, in order to perform traffic balancing on the two cells, the source cell base station may also decide to perform handover.
  • the source base station finds that the frequency of handover caused by the overload is high due to the cause value in the history information of the UE, it indicates that the reason for the handover is that after the cell is overloaded, the UE is switched out of the overloaded cell, and then the handover is performed again.
  • the overload can be selected to cause the switching to be less frequent, or the UE that does not overload causes the handover to switch.
  • the source base station finds that the frequency of handover caused by the overload is high due to the cause value in the history information of the UE, it indicates that the reason for the handover is that after the cell is overloaded, the UE is switched out of the overloaded cell, and then the handover is performed again.
  • the overload can be selected to cause the switching to be less frequent, or the UE that does not overload causes the handover to switch.
  • in order to prevent cell traffic overload, or for a cell whose traffic has been overloaded in order to prevent cell traffic overload, or for a cell whose traffic has been overloaded,
  • the source base station decides to switch the UE.
  • the corresponding strategy is to reduce traffic balance across the frequency layer, and thus increase more traffic of the frequency layer. In order to support more different services. In addition, for the bandwidth of the source cell is insufficient, when the service of higher bandwidth demand is paralyzed, the system needs to perform handover to switch the UE to other cells to meet the requirement of higher bandwidth.
  • the source base station finds that the high-speed switching frequency is high through the cause value in the UE history information, the source base station may decide to slow down the UE handover threshold, which will reduce the inter-frequency handover.
  • the eNodeB can To switch the UE to a larger cell layer, for example, from the micro cell micro cell layer to the macro cell macro cell layer, first determine the UE by "the number of times X switching within the length of the Y" in the existing segment. Switching frequency, the number of switching times X is divided by the length Y, and the rate adaptation conditions of different cells are OAM for the system.
  • X/Y is greater than the adaptation condition of the cell, i.e., greater than the handover frequency, the eNodeB will perform high speed handover to move the UE to a larger sized cell.
  • the source base station may decide to change the threshold of the UE handover, so that the UE switches to the smaller-sized cell. For example, switching from a macro cell to a micro cell for better quality of service.
  • the frequency of occurrence of various reasons in the above seven strategies can be statistically measured by performance measurement.
  • the threshold can be set according to the operator's requirements. If the threshold is exceeded, then It is considered that the frequency of occurrence of this cause is high.
  • step 4 The UE performs handover execution, and the step is an optional step, which is determined according to the handover strategy of step 3.
  • the UE history information after the handover cause value is added may include: a cell identifier, a cell type, a cell type, a cell frequency layer, a frequency layer of the
  • the cause value of the cell handover Cause Value for HO the UE stays in the cell.
  • mobility parameter adjustment including centralized mobility parameter adjustment and distributed mobility parameter adjustment, may be performed by using the added handover cause value in the UE history information:
  • eNodeB collects UEs.
  • the historical information forwards the UE history information to the central processing node SON/OAM, and the central processing node adjusts the parameter configuration according to the U E history information.
  • the specific steps are as follows: [63] The base station eNodeB collects data statistics counter information based on the handover cause value, specifically including
  • Performance Measurement (PM, Performance Measurement), counter used for eNodeB
  • the UE historical data is analyzed.
  • This measurement mechanism is similar to the type a basic switching frequency measurement, but for each cause value the measurement will be calculated separately if the same cause occurs frequently.
  • Start the timer and counter for a certain cause value similar to the fundamental frequency measurement ⁇ calculate the switching frequency value of a certain cause, and switch according to X/Y in a certain cause value frequency (SomeCauseHOfreq(X, Y)) Frequency N
  • the eNodeB may choose not to perform handover due to traffic balancing.
  • the base station may decide to switch the UE or perform corresponding policy adjustment according to the corresponding policy in the first embodiment.
  • the base station may decide to switch the UE or perform corresponding policy adjustment according to the corresponding policy in the first embodiment.
  • the cause value measure can be spread between different frequency layers, for example, as shown in Figure 3.
  • the system can measure coverage related, from microcells Micro
  • M is higher, for example, higher than a preset threshold, it can be switched to a larger cell, for example, switching from a micro cell to a macro cell, and if
  • the traffic balancing switch HO can be subsequently reduced.
  • the eNodeB sends its own statistics to the SON/OAM central node.
  • Reports from the eNodeB to the SON/OAM central node can be periodic or event-triggered.
  • the event trigger can be based on its own counter threshold or other counters.
  • other counters can be the number of active UEs or the traffic of the cell.
  • Central node SON/OAM adjusts the mobility parameters according to the statistics sent by the eNodeB.
  • the mobility parameters are adjusted by the eNodeB, which is often referred to as a distributed solution. Its statistical counter is like the counter defined by the centralized mobility parameter adjustment. But the difference is that these data statistics are not sent to the central node, but to other eNodeBs.
  • the distributed mobility parameter adjustment if an eNodeB detects the ping-pong handover problem, it is found that the switching frequency of a certain cause value is too high, and may be derived from the UE before.
  • the parameter problem of the cell is caused by the problem, so it is necessary to exchange the history information of the UE between the source cell and the target cell in the handover process.
  • the first embodiment and the second embodiment may be used in combination, for example, the data statistics obtained in the second embodiment may be used for the frequency information or the threshold value of the handover policy selection reference in the first embodiment.
  • the statistical result in the second embodiment may also be used.
  • the algorithm may also utilize historical switching frequency data in the UE history information, for example, when selecting an inter-frequency switching object for traffic balancing, using these UE history information:
  • the RRM can use the data in these historical information to perform algorithm selection and select the UE to be switched.
  • the above RRM is applicable to all cause values, but for emergency coverage cause handover and service cause handover, since the UE must be handed over, in both cases, the RRM cannot freely select an appropriate UE for handover.
  • the third embodiment can also be used in combination with the first embodiment. After the handover policy is selected in the first embodiment, the parameter optimized by the RRM algorithm can be selected as the handover policy selection result.
  • the third embodiment can also Used in conjunction with the second embodiment, that is, the RRM can perform RRM algorithm processing using the statistical results of the data provided in the second embodiment.
  • the present invention further provides a base station.
  • the base station is configured to store UE history information, where the history information type includes a handover cause value, and the base station selects a handover according to the cause value.
  • the base station includes: a user equipment UE history information storage module, configured to store for UE handover
  • the historical information of the preparation, the historical information includes: switching the reason value;
  • the handover policy selection module is configured to select a handover policy for the UE according to the statistical analysis result of the handover cause value data, and the selection of the specific handover policy corresponds to various policy selections in the first embodiment, and is not referred to herein.
  • the base station may further include: a data statistics module, where the data statistics module is configured to perform statistical analysis on the number of times and/or length of the handover cause value, and the data statistics module may be a PM measurement module, and the PM measurement
  • a data statistics module configured to perform statistical analysis on the number of times and/or length of the handover cause value
  • the data statistics module may be a PM measurement module, and the PM measurement
  • the specific operation method of the module is as described in the corresponding part of the second embodiment, and is not mentioned here.
  • the communication system including the user equipment UE and the foregoing base station is also within the protection scope of the present invention.
  • the function and implementation of the base station are as described in the fourth embodiment, and are not described herein.
  • the present invention can be implemented by means of software and a necessary general hardware platform. Of course, it can also be through hardware, but in many cases the former It is a better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a Computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or the corresponding changes may be located in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

说明书 一种 LTE系统中为用户设备 UE进行切换的方法和装置
[1] 本申请要求了 2008年 5月 4日提交的、 申请号为 200810066936.9、 发明名称为"初 始功率控制方法、 系统及装置"的中国申请的优先权, 其全部内容通过引用结合 在本申请中。
[2] 技术领域
[3] 本发明涉及移动通信技术领域, 特别涉及为用户设备 (UE, User
Equipment) 进行切换的方法及装置。
[4] 背景技术
[5] 第三代移动通信伙伴项目 (3GPP, Third Generation Partnership
Project) 中的乒乓效应术语用于描述不必要的过高频度的小区切换 (HO, Hando ver) 。 在某些情况下
UE可能会从一个小区切换到另一个小区, 然后再次切换回来。 这种情况如果不 是高频度很快的发生, 则仍然认为是正常的情况, 但是在以下场景下切换率很 高, 这意味着 UE在小区停留很短吋间并且增加了信令复合量增大了系统 (切换 ) 失败的风险。
[6] 在当前的通用移动通信系统 (UMTS, Universal Mobile Telecommunications
System)中, 如图 1所示, 移动性处理由无线网络控制器 (RNC, Radio Network Controller)完成。 RNC控制基站 (NodeB) , 而每个基站有很多小区, 因此, RN C可在很大的地理范围内控制 UE并处理 UE的移动性问题。 UE的切换算法及相关 数据都存储于 RNC中, RNC可由此侦测和减轻乒乓切换的问题。
[7] 但是由于长期演进系统 (LTE, Long Time
Evolution)引入了扁平结构, 如图 2所示, 使得 LTE网络只有两层节点: 核心网 (· CN, Core Net) 和无线接入网(RAN,Radio Access
Network) , 在 RAN之中由基站 eNodeB处理 UE的移动性, 因此 LTE网络中 eNodeB 之间的 UE
切换远远高于 UMTS的跨 RNC之间的切换。 相应地, 在 LTE系统中关于切换准备 过程的 UE历史信息直接在 eNodeB之间通过 X2接口传递, 或在 eNodeB之间经 S 1 接口通过核心网转发, 以满足切换过程的需要, 如图 2所示。
[8] 现有技术中的一种通过 UE历史信息的传递减少乒乓切换的方法是: 将小区的 频率信息加入到 UE历史信息之中, 但即使将频率信息加入到 UE历史信息中, 仅 能得到 UE在不同频率层切换的历史信息, 由于切换原因的复杂性, eNodeB仍旧 不可能识别其它 eNodeB异频率切换的潜在的原因。 乒乓切换并没有得到完全缓 解。
[9] 发明内容
[10] 本发明实施例要解决的问题是提供一种为用户设备 UE进行切换的方法和装置
, 解决现有技术带来的乒乓切换控制不善的技术缺陷。
[11] 一种长期演进 LTE系统中为用户设备 UE进行切换策略选择的方法, 包括以下步 骤:
[12] 基站对用户设备 UE的历史信息进行统计分析, 所述历史信息包括 UE切换的原 因值;
[13] 所述基站根据对所述切换原因值的数据统计分析结果, 为所述 UE进行切换策 略选择。
[14] 一种长期演进 LTE系统中的基站, 包括如下模块,
[15] 用户设备 UE历史信息存储模块, 用于存储所述 UE的历史信息, 所述历史信息 包括, 切换原因值;
[16] 切换策略选择模块, 用于根据所述切换原因值的数据统计分析结果, 为 UE进 行切换策略选择。
[17] 本发明实施例的提出的技术方案具有以下优点, 在用于 UE切换的历史信息中 增加切换原因值, 使得对 UE进行的每次切换可以综合考虑切换原因的各种情况 , 做出合理的切换, 从而降低乒乓切换发生的频度。
[18] 附图说明
[19] 图 1为现有技术 UMTS架构图;
[20] 图 2为现有技术 LTE架构图;
[21] 图 3为微微小区复叠微小区的示意图; [22] 图 4为 UE在不同流量的两个不同频率层之间的切换示意图;
[23] 图 5为本发明实施例概括描述流程图;
[24] 图 6为本发明第一实施例流程图;
[25] 图 7为本发明第四实施例基站结构图。
[26] 具体实施方式
[27] 下面结合附图, 对本发明实施例作进一步详细描述:
[28] 如图 5所示, 本发明实施例在 UE历史信息中增加切换原因值, 该切换原因值由 源小区添加到 UE历史信息中。 该切换原因值主要描述进行异频切换的原因。 具 体原因如下:
[29] ( 1) 覆盖致使的切换: UE可以仍然驻留在源小区获得服务, 但是切换将有益 于获得更好的无线空口条件。 即, 考虑到目标小区的更好的切换条件, 可以进 行切换。 具体包括如下两种情况: 覆盖致使的异频率切换, UE可以仍然在源小 区获得服务, 但是切换将有益于获得更好的异频无线空口条件; 覆盖致使的同 频率切换, UE可以仍然在源小区获得服务, 但是切换将有益于获得更好的同频 无线空口条件。
[30] (2) 紧急性致使的切换: UE可以仍然驻留在源小区获得服务, 但是如果是为 了避免覆盖丧失导致的掉话, 则可以进行切换。
[31] (3) 流量均衡致使的切换: UE可以仍然驻留在源小区获得服务, 但是如果进 行切换将有益于流量均衡, 即"原因值 "有流量均衡的指示信息, 指示目标小区切 换的发生可以便于小区间得到相对均衡的流量。
[32] (4) 过载致使的切换: UE可以仍然驻留在源小区获得服务, 但是如果进行切 换将有益于减轻当前小区的过载情况, 即"原因值 "有过载指示的指示信息, 指示 目标小区切换的发生可以缓解过载小区的负载。
[33] (5) 业务致使的切换:
UE可以仍然驻留在源小区获得服务, 但是如果进行切换将可以获得其他特定业 务, 即"原因值 "有业务指示的指示信息, 指示目标小区切换的发生可以使得 UE 获得其他特定业务。
[34] (6) 高速致使的切换: UE可以仍然驻留在源小区获得服务, 但是如果进行切换将可以减少高速切换的 频率, 即"原因值 "有高速致使切换的指示信息, 指示目标小区切换的发生可以使 得 UE减少高速切换的频率, 例如将 UE切换到更大的小区层, 例如从微小区层 mi cro cell层至 lj宏小区层 macro cell层。
[35] (7) 低速致使的切换: UE依然在原小区得以服务但是切换将有益于低速 UE切 换到更小尺寸的小区, 以增强服务质量。 对于 macro
cell宏小区 eNodeB将会切换 UE到符合低速的 micro
cell微小区层。 UE可以仍然驻留在源小区获得服务, 但是如果进行切换将可以降 低高速切换的频率, 即"原因值 "有高速指示的指示信息, 指示目标小区切换的发 生可以使得 UE降低高速切换的频率, 例如将 UE切换到更大的小区层, 例如从微 zj、区 micro cell到宏小区 macro cello
[36] 同吋, 基站在获得具有原因值的 UE历史信息之后, 对一定吋间内的 UE历史信 息中的切换原因值进行统计分析, 该一定吋间可以通过系统预设实现, 进而通 过集中式移动性参数调整和分布式移动性参数调整两种方法对移动性参数进行 调整。 该移动性参数可以为导频强度 Ec/Io的偏置 (Qoffset) , 则调节该偏置值 , 可以对 UE进行提前切换或滞后切换; 或者; 该移动性参数可以是 Qoffset、 天 线方位, 天线下倾角, 基站的输出功率的任意一种或几种的组合。
[37] 集中式移动性参数调整为 eNodeB收集的历史信息, 并将该历史信息转发到中 央处理节点自组 /自优化网络 SON (Self-Organized/Optimizing
Networks) /操作和维护 OAM(Operation and
Maintenance) , 中央处理节点根据该历史信息进行参数配置。 分布式移动性参数 调整, 为 eNodeB调整移动性参数, 该调整方法通常被称作移动性参数调整。
[38] 另外, 可以使用无线资源管理 (RRM, Radio Resource
Management) 算法对 UE History IE
中携带的原因值进行优化管理, 得到合适的判决结果。
[39] 为详细说明本发明各实施例的具体内容及有益效果, 以下将详细描述各具体实 施例:
[40] 第一实施例, 以 LTE系统中, UE的切换流程作为描述基础: [41] 在 LTE系统中, 当 UE在小区间切换吋, 整个切换流程大致包括测量-上报-判决- 执行 4个步骤。 即当无线条件发生改变吋, UE对邻小区进行测量, 并将包含邻小 区信息的测量报告发送给 UE所属基站, 该基站根据测量报告做出决策, 决定 UE 向目标小区进行切换吋, 根据目标小区的标识进行信息交换, 完成目标小区的 资源准备; 之后 UE所属基站向 UE发送切换命令; UE根据切换命令断开与源小 区的连接, 开始同步到目标小区, 并在目标小区上开始发送和接收用户数据, U E所属源基站释放源小区的无线资源, 切换完成。
[42] 以 UE在源基站 (Source eNodeB) 和目标基站 (Target
eNodeB) 控制的小区间切换为例:
[43] 该实施例主要说明, UE在切换过程中, 源基站会通过对历史信息的分析, 为 U E选择切换策略, 进一步地, eNodeB之间会转发 UE的历史信息, 例如, 源基站 对 UE历史信息中的切换原因值进行分析后, 会将历史信息及数据统计分析结果 发送给目标基站, 目标基站也可以根据该数据统计分析结果及历史信息为 UE选 择合适的目标小区为源基站做切换判决作参考, 具体地, 可在源基站与目标基 站之间通过 X2接口传递, 或源基站与目标基站之间经 S1接口通过核心网传递, 以满足切换过程的需要。
[44] 如图 6所示, 具体步骤如下:
[45] 1 . UE所属的源基站向目标基站发送测量控制消息, 具体消息类型可以是 Meas urement Control
[46] 2. UE向源基站发送测量报告, 具体可以是 measurement
report, UE的具体对相邻小区的测量方法在此不再赞述。
[47] 3. 源基站根据 UE发来的测量报告及自身存储的用于切换准备的 UE历史信息, 进行切换策略选择。 该历史信息中包括 UE切换的原因值, 源基站根据不同的原 因值的数据统计分析, 相应釆取不同的策略对 UE进行切换, 具体情况及对应策 略如下:
[48] (1) 如果源基站通过 UE历史信息中的原因值发现覆盖致使的切换频度较高, 则相应策略可以是, 通过改变移动性参数来减少切换次数, 例如改变小区覆盖 的大小, 而非改变其频率, 即异频切换, 这也许会增加系统掉话率。 进一步地 , 运营商可以通过 OAM/SON节点对 UE历史纪录地统计分析, 对切换频度进行统 计, 通过改变传输功率、 改变天线倾角、 增加中继、 或增加小区数量来改善覆 盖情况。 另外, 如果 UE测量之后发现另外一个小区的信号覆盖好于本小区,通过 测量报告报告给源基站,则源基站可以选择将 UE切换到覆盖信号好于本小区的目 标小区.
[49] (2) 如果源基站通过 UE
历史信息中的原因值发现紧急性致使的切换频度较高, 那么说明 UE起初在覆盖 不好的小区, 如果这种原因的切换多次出现, 那么意味着用户当前的服务区域 信号较差, 而这个地理区域的紧急性致使切换较多后, 运营商可通过改变传输 功率、 改变天线倾角、 增加中继、 或增加小区数量来改善覆盖情况。 另外, 在 源小区即将掉话的情况,基站需要决定对 UE立即进行切换.
[50] (3) 如果源基站通过 UE历史信息中的原因值发现流量均衡致使的切换频度较 高, 则相应策略可以是, 减少跨频率层的流量均衡, 这将导致系统流量的一些 失衡, 但是将减少总的异频切换的次数; 或者, 可以尽量均衡那些在空闲 (Idle ) 状态的 UE, P , 通过系统消息广播中的移动性参数改变, 来均衡各个 Idle 状态的 UE。 另外, 为了对两个小区进行流量均衡,源小区基站也可以决定进行切 换。
[51] (4) 如果源基站通过 UE历史信息中的原因值发现过载致使的切换频度较高, 那么说明其切换原因是小区过载后, UE被切换出该过载小区, 则后续再次切换 吋, 可以挑选过载致使切换的频度较低, 或是没有过载致使切换的 UE来进行切 换。 另外, 为了防止小区流量过载, 或者对于流量已经过载的小区,
源基站决定对 UE进行切换。
[52] (5) 如果源基站通过 UE历史信息中的原因值发现业务致使的切换频度较高, 则相应策略为减少跨频率层的流量均衡, 并因此增加该频率层的更多的流量以 便于支持更多的不同的服务。 另外, 针对源小区带宽不足,当更高带宽需求的业 务出现吋,系统需要进行切换,将 UE切换到其它的小区来满足更高带宽的需求。
[53] (6) 如果源基站通过 UE历史信息中的原因值发现高速致使的切换频度较高,源 基站可以决定放缓 UE切换的门限值, 这样将减少异频的切换。 另外, eNodeB可 以将 UE切换到更大尺寸的小区层, 例如从 micro cell微小区层到 macro cell宏小区层, 首先在已有的一段吋间内通过 "Y吋长之内切换的次数 X"判断 UE 的切换频率, 切换次数 X除以吋长 Y, 而不同的小区的速率适配条件对于系统而 言是由 OAM
配置的。 如果 X/Y大于该小区的适配条件, 即大于该切换频率, eNodeB将会行 使高速切换, 将 UE移动到更大尺寸的小区。
[54] (7) 如果源基站通过 UE历史信息中的原因值发现低速致使的切换频度较高,源 基站可以决定更改 UE切换的门限值, 使 UE切换到尺寸更小的小区去, 例如从宏 小区切换到微小区, 以获得更好的服务质量。
[55] 上述七种策略中的各种原因出现的频度较高的情况, 可以通过性能测量对其频 度进行统计, 可以按照运营商需求设定门限值, 超过该门限值, 则认为该原因 出现的频度较高。
[56] 4. UE进行切换执行, 该步骤是可选步骤, 依据步骤 3的切换策略而定。
[57] 使用上述步骤进行切换策略选择, 可以在切换较多的场景下减少切换的数量到 一个合理的程度, 尤其是异频切换的次数。 相应切换策略针对不同的切换原因 值而有所不同。 进一步地, 上述各种原因值及其策略也可以组合, 具体可以通 过无线资源管理 RRM对其进行组合。
[58] 更为具体地, 增加切换原因值后的 UE历史信息具体可以包括: 小区标识 Cell Identity, 小区类型 Cell types, 小区频率层 Frequency layer of the
cell, 小区切换的原因值 Cause Value for HO, UE在小区的停留吋间 Time UE stayed in cell。
[59] 第二实施例, 使用 UE历史信息中增加的切换原因值, 可以进行移动性参数调 整, 包括集中式移动性参数调整和分布式移动性参数调整:
[60] (一)集中式移动性参数调整的情况:
[61] 将系统参数重新配置的一种技术手段为, 基站 (eNodeB) 收集 UE
历史信息并转发该 UE历史信息到中央处理节点 SON/OAM,该中央处理节点根据 U E历史信息来调整参数配置.
[62] 具体操作步骤如下: [63] 基站 eNodeB收集基于切换原因值的数据统计计数器信息, 具体包括
[64] 性能测量 (PM, Performance Measurement) , 计数器用于为 eNodeB
对 UE历史数据进行分析。
[65] 具体的性能测量包括如下种类:
[66] a.基础切换的频度测量
[67] 设置参数: 吋长 Y与切换次数 X, 为其中任一参数设置门限值, 例如, 为吋长 Y 设置门限值, 则当达到 Y的门限值吋, X也停止计数, 记录此吋 X的值, 及相应 的频度 N = X/Y。 这样, 在吋长 Y内, 对于该吋长内大于 X次切换的切换频度测量 , 即此吋的切换频度大于前文所述的频度 N。 具体地, 参数基础切换的参数切换 次数 X、 吋长 Y, BasicHOfreq(X,Y) , 可以由 SON/OAM中央节点设置。 具体可以 如下操作:
[68] al . 基础切换测量频度 (BasicHOfreq(X,Y)) , 其中, 由 SON/OAM中央节点设 置 X。
[69] a2. UE所属的
eNodeB启动计数器和定吋器, 每一次切换计数器增加一次, 直到满 X次吋, 停 止定吋器, 并记录 BasicHOfreq(X,Y)的值 N =X/Y次 /秒
[70] a3.再次启动基础频率测量幵始再次测量。
[71] al至 a3循环往复。
[72] b.每一原因值的测量
[73] 这一测量机制类似于种类 a基础切换频度测量, 但是对于每一个原因值将会分 别测量计算, 如果相同的原因经常性发生的话。 对某一原因值启动定吋器和计 数器, 类似于基础频度测量吋计算某一原因的切换频度值, 根据某一原因值频 度 (SomeCauseHOfreq(X,Y)) 中 X/Y得到切换频度 N
次 /秒。 例如, 计算出流量均衡的频度过高, 大于 N, 则 eNodeB可以选择不进行 由于流量均衡原因导致的切换。 或者当出现第一实施例中的七种原因值中的切 换原因频度值较高的情况, 基站可以釆取第一实施例中的相应策略决定对 UE进 行切换或者做相应的策略调整。
[74] c.复合原因值测量 [75] 这一测量机制类似于基础 HO频度测量, 但是对于不同场景多于一个原因值发 生吋而言, 一个测量可以相应于上述种类 a的测算, 不同的是, 需测算多个原因 值。 例如可以同吋测算覆盖致使切换和流量均衡的原因值, 如图 4
所示。 基础切换 HO频度测量和流量均衡测量将会同吋进行。 计算流量均衡原因 的切换的频度的值 N次 /秒和计算基础 HO频度值
M次 /秒同吋进行。 如果 N频度太高可以不在进行流量均衡切换而只进行基础切换 。 如果频度过高, 例如大于 N, 则可以切换到更大尺寸小区。 或者当出现第一实 施例中的七种原因值中的切换原因频度值较高的情况, 基站可以釆取第一实施 例中的相应策略决定对 UE进行切换或者做相应的策略调整。
[76] d.频率层间的 PM计数器测量
[77] 原因值测度可以在不同频率层间展开, 例如, 如图 3
所示, 系统可以测度覆盖相关的, 从微小区 Micro
cell发生的切换 HO和测度流量均衡所导致的从微微小区 Picocell发生的切换 HO, 因此, 系统将有一个类似于种类 b的测度。 所不同的是仅在超宽带无线频率绝对 信道数 (EARFCN, E-UTRA Absolute Radio Frequency Channel
Number) EARFCN A频率上, 测度覆盖相关的原因值; 在 EARFCN
B频率上仅测度流量均衡相关的原因值。 例如, 在 EARFCN
A频率上计算基础 HO频度值 M次 /秒, 在 EARFCN
B频率上测得流量均衡的 HO频度值
N次 /秒。 如果 M较高, 例如高于预设门限, 则可以切换到更大尺寸小区, 例如从 微小区切换到宏小区, 而如果
N较高, 例如高于预设门限, 则可以后续减少流量均衡的切换 HO。
[78] 2.eNodeB将自身统计的数据发送至 SON/OAM中央节点。
[79] 从 eNodeB到 SON/OAM中央节点的报告可以是周期性的也可以是事件触发的。
事件触发可以是基于自身计数器门限或是其它计数器, 例如, 其它计数器可以 是激活态 (active) UE的数量或者是小区的流量。
[80] 3.中央节点 SON/OAM根据 eNodeB发送的数据统计对移动性参数进行调整。
Figure imgf000011_0001
[82] 对于分布式移动性参数调整, 则由 eNodeB来调整移动性参数, 该调整方法通 常被称作分布式解决方案。 其统计计数器如同集中式移动性参数调整所定义的 计数器。 但是不同的是, 并不发送这些数据统计信息给中央节点, 而是发送给 其它的 eNodeB。 对于分布式移动性参数调整的情况, 如果一个 eNodeB侦测出乒 乓切换问题一通过对 UE历史信息中的各原因值统计发现, 某个原因值的切换 频率过高, 也可能是源于 UE先前所在的小区的参数问题所导致的, 所以在切换 过程中, 源小区与目标小区之间交换 UE的历史信息是十分必要的。
[83] 第一实施例和第二实施例可以结合使用, 例如, 对于第二实施例得到的数据统 计结果, 可以用于第一实施例中的切换策略选择参考的频度信息或门限值, 在 第一实施例描述的, 需要对网络覆盖进行调整, 或者小区的参数进行调整等代 表的参数调整情况中, 也可以使用第二实施例中的统计结果。
[84] 第三实施例, RRM
算法也可以利用 UE历史信息中的历史切换频度数据, 例如, 当为流量均衡而选 择异频切换对象吋运用这些 UE历史信息:
通过査证 UE历史信息, 选择那些最少进行异频切换的 UE; 或者设置最大准许切 换次数门限, 即, 设置每个 UE异频切换的最大准许次数, 例如 "Y吋间之内最大 准许切换的次数 X"。 RRM能够利用这些历史信息中的数据来进行算法选择, 选 择要被切换的 UE。
[85] 上述 RRM对于所有的原因值都适用, 但是对于紧急覆盖原因切换和服务原因的 切换, 由于必须对 UE进行切换, 则在这两种情况中 RRM不能自由选择适当的 UE 进行切换。
[86] 第三实施例也可以与第一实施例结合使用, 在第一实施例对切换策略进行选择 吋, 可以选择 RRM算法优化后的参数, 作为切换策略选择结果; 第三实施例也 可以与第二实施例结合使用, 即 RRM可以利用第二实施例中提供的数据统计分 析结果进行 RRM算法处理。
[87] 第四实施例, 本发明还提供了一种基站, 如图 7所示, 该基站用于存储 UE历史 信息, 该历史信息种包括切换原因值, 基站根据该原因值为 UE选择切换策略,
[88] 进一步地, 该基站包括: 用户设备 UE历史信息存储模块, 用于存储为 UE切换 进行准备的历史信息, 该历史信息包括, 切换原因值;
[89] 切换策略选择模块, 用于根据对切换原因值数据的统计分析结果为 UE选择切 换策略, 具体切换策略的选择对应第一实施例的各种策略选择, 在此不再赞述
[90] 进一步地, 该基站还可以包括, 数据统计模块, 该数据统计模块用于对切换原 因值的次数和 /或吋长进行数据统计分析, 该数据统计模块可以吋 PM测量模块, PM测量模块的具体操作方法如第二实施例相应部分的描述所述, 在此不再赞述
[91] 另外, 包括了用户设备 UE和上述基站的通信系统也在本发明的保护范围之内 , 该基站的功能及实现如第四实施例所描述, 在此不再赞述。
[92] 通过以上的各实施例的描述, 本领域的技术人员可以清楚地了解到本发明可借 助软件及必需的通用硬件平台的方式来实现, 当然, 也可以通过硬件, 但很多 情况下前者是更佳的实施方式。 基于这样的理解, 本发明的技术方案本质上或 者说对现有技术做出贡献的部分可以以软件产品的形式体现出来, 该计算机软 件产品存储在一个存储介质中, 包括若干指令用以使得一台计算机设备 (可以 是个人计算机, 服务器, 或者网络设备等) 执行本发明各个实施例所述的方法
[93] 本领域技术人员可以理解附图只是一个优选实施例的示意图, 附图中的模块或 流程并不一定是实施本发明所必须的。
[94] 本领域技术人员可以理解实施例中的装置中的模块可以按照实施例描述进行分 布于实施例的装置中, 也可以进行相应变化位于不同于本实施例的一个或多个 装置中。 上述实施例的模块可以合并为一个模块, 也可以进一步拆分成多个子 模块。
[95] 上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。
[96] 以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不局限于 此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到 的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围 应该以权利要求的保护范围为准。

Claims

权利要求书
[1] 一种长期演进 LTE系统中为用户设备 UE进行切换策略选择的方法, 其特征 在于, 包括以下步骤:
基站对用户设备 UE的历史信息进行统计分析, 所述历史信息包括 UE的切 换原因值;
所述基站根据对所述切换原因值的数据统计分析结果, 为所述 UE进行切换 策略选择。
[2] 如权利要求 1所述的方法, 其特征在于, 所述基站根据对所述切换原因值的 数据统计分析结果, 为所述 UE进行切换策略选择具体包括, 基站根据切换 原因值的频度数据统计分析结果, 为所述 UE进行切换策略的选择。
[3] 如权利要求 1所述的方法, 其特征在于, 所述基站通过性能测量对所述 UE 的历史信息中的原因值进行数据统计分析。
[4] 如权利要求 1所述的方法,
其特征在于, 所述切换原因值包括如下原因值中的任意一种或其组合: 覆盖致使的切换; 紧急性致使的切换; 流量均衡致使的切换; 过载致使的 切换; 业务致使的切换; 高速致使的切换; 低速致使的切换。
[5] 如权利要求 1所述的方法, 其特征在于, 基站根据对所述切换原因值的数据 统计分析, 为所述 UE进行切换策略选择具体包括:
当覆盖致使的切换频度高于预定的数值吋, 则所述切换策略为所述基站通 过改变移动性参数来减少切换次数或将所述 UE切换到比所述 UE的源小区 信号好的目标小区;
当所述基站通过所述 UE
历史信息中的所述切换原因值发现紧急性致使的切换频度高于预定的数值 吋, 所述切换策略包括所述基站对所述 UE立即进行切换;
当所述基站通过所述 UE历史信息中的原因值发现流量均衡致使的切换频度 高于预定的数值吋, 所述切换策略为减少跨频率层的流量均衡, 或者, 所 述基站均衡空闲状态的 UE;
当所述基站通过所述 UE历史信息中的原因值发现过载致使的切换频度高于 预定的数值吋, 所述切换策略包括, 所述基站挑选过载致使切换的频度低 于预定的数值, 或没有过载致使切换的 UE进行切换, 或者, 对于流量已经 过载的小区,所述基站决定对 UE进行切换;
当所述基站通过所述 UE历史信息中的原因值发现业务致使的切换频度高于 预定的数值, 所述切换策略包括, 减少跨频率层的流量均衡, 或者, 所述 基站决定将 UE切换到满足带宽需求的小区;
当所述基站通过所述 UE历史信息中的原因值发现低速致使的切换频度高于 预定的数值,
所述切换策略包括, 所述基站决定更改 UE切换的门限值使其切换到比所述
UE的源小区尺寸小的小区去。
[6] 如权利要求 2、 3、 或 4所述的方法, 其特征在于, 使用无限资源管理 RRM 对所述切换原因值进行组合。
[7] 如权利要求 1、 2或 4所述的方法, 其特征在于, 网络侧根据所述切换原因值 进行移动性参数调整。
[8] 如权利要求 7所述的方法, 其特征在于, 所述的移动性参数调整包括: 集中 式移动性参数调整和 /或分布式移动性参数调整。
[9] 如权利要求 8所述的方法, 其特征在于, 所述的集中式移动性参数调整, 包 括:
基站收集基于切换原因值的数据统计计数器信息, 所述数据统计计数器信 息包括: 基础切换的频度测量信息、 每一原因值的测量信息、 复合原因值 测量信息和 /或频率层间的性能测量计数器测量信息.
所述网络侧根据所述切换原因值进行移动性参数调整包括: 中央处理节点根据所述数据统计计数器信息对移动性参数进行调整。
[10] 一种长期演进 LTE系统中的基站, 其特征在于, 包括如下模块,
用户设备 UE历史信息存储模块, 用于存储所述 UE的历史信息, 所述历史 信息包括, 切换原因值;
切换策略选择模块, 用于根据所述切换原因值的数据统计分析结果, 为 UE 进行切换策略选择。
[11] 如权利要求 10所述的基站, 其特征在于, 所述基站进一步包括, 数据统计分析模块, 用于对所述切换原因值进行数据分析统计。
[12] 一种长期演进 LTE系统中用户设备 UE的切换方法, 其特征在于, 源基站向 目标基站发送 UE的历史信息, 所述 UE的历史信息包括切换的原因值, 所 述源基站根据所述历史信息为所述 UE进行切换判决。
PCT/CN2009/071615 2008-05-04 2009-04-30 一种lte系统中为用户设备ue进行切换的方法和装置 WO2009135428A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200810066936.9 2008-05-04
CN2008100669369A CN101572919B (zh) 2008-05-04 2008-05-04 一种lte系统中为用户设备ue进行切换策略选择的方法

Publications (1)

Publication Number Publication Date
WO2009135428A1 true WO2009135428A1 (zh) 2009-11-12

Family

ID=41232121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2009/071615 WO2009135428A1 (zh) 2008-05-04 2009-04-30 一种lte系统中为用户设备ue进行切换的方法和装置

Country Status (2)

Country Link
CN (1) CN101572919B (zh)
WO (1) WO2009135428A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013020598A1 (en) * 2011-08-11 2013-02-14 Nokia Siemens Networks Oy Optimizing a handover behavior of a mobile radio communication network based on an extended data record being associated with a user equipment

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102131257A (zh) * 2010-01-18 2011-07-20 中兴通讯股份有限公司 一种移动性优化中上报切换报告的方法及系统
CN102196485B (zh) * 2010-03-09 2015-06-03 中兴通讯股份有限公司 Lte系统中减少不必要切换的方法及系统
CN101854684B (zh) * 2010-05-17 2012-11-14 北京邮电大学 无线蜂窝通信系统中基于切换类型的优化切换参数的方法
CN102843737B (zh) * 2011-06-24 2015-08-19 中国电信股份有限公司 CDMA2000 1x网络中的空闲切换方法和终端
CN103167570B (zh) * 2011-12-19 2015-06-17 中国科学院声学研究所 一种室内蜂窝网络网中的切换触发与判决方法及系统
CN102740335A (zh) * 2012-06-13 2012-10-17 北京邮电大学 家庭基站网络的切换自优化方法
CN103517350B (zh) * 2012-06-28 2018-11-09 中兴通讯股份有限公司 切换信息处理方法及装置
CN102724721B (zh) * 2012-06-28 2015-09-09 华为技术有限公司 小区切换的方法和基站
KR102091696B1 (ko) * 2013-08-08 2020-03-20 삼성전자주식회사 이동 통신 시스템에서 매크로 셀과 스몰 셀 간 스위칭 동작 수행 장치 및 방법
WO2016011576A1 (zh) * 2014-07-21 2016-01-28 华为技术有限公司 网络优化的方法、装置和基站
CN105323829A (zh) * 2014-07-31 2016-02-10 中兴通讯股份有限公司 小区选择的方法、装置、基站及终端
CN104301921B (zh) * 2014-10-29 2018-08-14 京信通信系统(中国)有限公司 一种乒乓切换检测方法和设备及切换参数配置方法和设备
CN105208615B (zh) * 2015-06-16 2019-04-16 南京邮电大学 一种超密集网络中基于预测门限滞后余量可调的切换方法
CN105022047B (zh) * 2015-08-18 2017-11-14 中国人民解放军装甲兵工程学院 一种激光测距仪使用频率自动记录装置及其控制方法
WO2021253399A1 (en) * 2020-06-19 2021-12-23 Qualcomm Incorporated History based cell handover for small cells
CN115413006B (zh) * 2022-11-02 2023-04-07 深圳国人无线通信有限公司 一种基站提升终端续航能力的方法和系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1859704A (zh) * 2005-10-28 2006-11-08 华为技术有限公司 一种调整高速下行分组接入网络覆盖的方法
CN1866891A (zh) * 2005-09-23 2006-11-22 华为技术有限公司 一种WiMAX接入网络链路切换处理方法
WO2007027034A1 (en) * 2005-08-29 2007-03-08 Ktfreetel Co., Ltd. Method and apparatus for optimizing neighbor list automatically in asynchronous wcdma network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002232929A (ja) * 2001-02-01 2002-08-16 Ntt Docomo Inc ハンドオーバ制御方法、移動局及び通信制御装置
JP2004289226A (ja) * 2003-03-19 2004-10-14 Nec Corp 携帯情報端末及びハンドオーバー解決方法
CN100442936C (zh) * 2006-04-12 2008-12-10 华为技术有限公司 一种无线通信系统中的切换方法和切换装置
CN101128057B (zh) * 2007-09-27 2012-04-04 中兴通讯股份有限公司 基站切换的优化方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007027034A1 (en) * 2005-08-29 2007-03-08 Ktfreetel Co., Ltd. Method and apparatus for optimizing neighbor list automatically in asynchronous wcdma network
CN1866891A (zh) * 2005-09-23 2006-11-22 华为技术有限公司 一种WiMAX接入网络链路切换处理方法
CN1859704A (zh) * 2005-10-28 2006-11-08 华为技术有限公司 一种调整高速下行分组接入网络覆盖的方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013020598A1 (en) * 2011-08-11 2013-02-14 Nokia Siemens Networks Oy Optimizing a handover behavior of a mobile radio communication network based on an extended data record being associated with a user equipment
US9655014B2 (en) 2011-08-11 2017-05-16 Nokia Solutions And Networks Oy Optimizing a handover behavior of a mobile radio communication network based on an extended data record being associated with a user equipment

Also Published As

Publication number Publication date
CN101572919B (zh) 2012-05-23
CN101572919A (zh) 2009-11-04

Similar Documents

Publication Publication Date Title
WO2009135428A1 (zh) 一种lte系统中为用户设备ue进行切换的方法和装置
JP4938863B2 (ja) 端末装置をマクロセルにハンドオーバするための方法、システム、端末装置、アクセスノード、およびゲートウェイ
JP5862569B2 (ja) 無線通信システムと方法並びに無線端末、無線局、及び運用管理サーバ装置
DK3216269T3 (en) APPLICATION OF A MODEL FOR PREDICTING THE QUALITY OF SERVICE IN A TARGET TRACT FOR A HANDLE
JP6214667B2 (ja) Rat相互間のモビリティ設定を協調するための方法
EP2926593B1 (en) Expanding or shrinking a coverage area of a cell
JP5907074B2 (ja) ハンドオーバ制御方法、制御装置、調整装置、及びプログラム
JP2019050617A (ja) 無線通信システムと方法と無線基地局と制御局
US8917702B2 (en) Method and device for data processing in a wireless network
KR20210131268A (ko) QMC (quality of experience measurement collection)를 수행하는 방법 및 장치
Orsino et al. Effective RAT selection approach for 5G dense wireless networks
EP3026950A2 (en) Telecommunications control with service aware optimization in a selforganizing network
EP2827635A1 (en) Wireless communications system, wireless station, network operation management device, and network optimization method
Su et al. A self-optimizing mobility management scheme based on cell ID information in high velocity environment
Zhang et al. A two-layer mobility load balancing in LTE self-organization networks
Sun et al. A multi-attribute handover algorithm for QoS enhancement in ultra dense network
Wang et al. A soft handover algorithm for TD-LTE system in high-speed railway scenario
WO2012083666A1 (zh) 一种优化负荷均衡的方法和装置
EP2833670B1 (en) Apparatuses, methods and computer programs for macro and small cell base station transceivers and mobile transceivers to provide handover information
WO2013113230A1 (zh) 发送数据的方法及终端
Zhang A user mobility analysis assistive MRO algorithm for handover parameters optimization in LTE SON system
Yang et al. Virtual cell-breathing based load balancing in downlink LTE-A self-optimizing networks
KR20100071850A (ko) 차세대 이동통신 시스템에서의 이동성 관리방법
EP2949153B1 (en) Methods and apparatus for transmitting handover information
Sun et al. AP based traffic steering for LTE-Wi-Fi networks

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09741703

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09741703

Country of ref document: EP

Kind code of ref document: A1