CN103501504B - A kind of mobile robustness optimization method based on switching statistics of easy realization - Google Patents
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Abstract
本发明提供了公开了一种易实现的基于切换统计的移动鲁棒性优化方法，在对移动鲁棒性优化的过程中，针对现有技术上的复杂度以及难实现的方式，提出一种简化、改进的LTE？SON多小区蜂窝式移动网络中移动鲁棒性优化方法，具体的，在判断发生过早切换、过晚切换以及切换到错误小区这三种错误切换之后，将判断到的切换到错误小区结果记为一次过早切换以及一次过晚切换，并统计预设周期内发生成功切换的比例，然后再根据预设周期内成功切换的比例确定需要进行优化时，通过调整小区迟滞参数和小区间偏移值来实现移动鲁棒性优化。
The present invention discloses an easy-to-implement mobile robustness optimization method based on handover statistics. In the process of mobile robustness optimization, a method is proposed aiming at the complexity and difficult implementation of the prior art. Simplified, improved LTE? The mobile robustness optimization method in the SON multi-cell cellular mobile network, specifically, after judging the occurrence of three types of wrong handovers: premature handover, too late handover, and handover to the wrong cell, the result of handover to the wrong cell is recorded as One premature handover and one too late handover, and count the proportion of successful handover within the preset period, and then determine the need for optimization according to the proportion of successful handover within the preset period, by adjusting the cell hysteresis parameter and inter-cell offset value To achieve mobile robustness optimization.
Description
技术领域technical field
本发明属于移动通信技术领域，具体涉及LTE自组织网络中一种易实现的基于切换统计的移动鲁棒性优化方法。The invention belongs to the technical field of mobile communication, and in particular relates to an easy-to-implement mobile robustness optimization method based on switching statistics in an LTE self-organizing network.
背景技术Background technique
3GPP长期演进中，通信技术的快速发展导致蜂窝网络变得越来越复杂，如果按照传统的网络布设和优化方式，将需要大量的人工配置和管理资源，对于网络运营商来说，这甚至导致无法承受的开销，因此如何有效降低使用新技术增加的成本是一个很大的挑战。在这一背景下，3GPP国际标准化组织提出了自组织网络(SON)方案，可以尽量减少配置以及管理过程中人工的介入，降低大量开支，SON将成为运营商对网络进行规划、配置等的主要手段。In the long-term evolution of 3GPP, the rapid development of communication technology has caused the cellular network to become more and more complex. If the traditional network deployment and optimization method is followed, a large amount of manual configuration and management resources will be required. For network operators, this will even lead to Unbearable overhead, so how to effectively reduce the increased cost of using new technologies is a big challenge. In this context, the 3GPP International Organization for Standardization proposed a self-organizing network (SON) solution, which can minimize manual intervention in the configuration and management process and reduce a lot of expenses. SON will become the main tool for operators to plan and configure networks. means.
SON技术主要包括自配置(Self-Configuration)、自优化(Self-Optimization)和自治愈(Self-Healing)三个方面的内容。自配置功能是指新部署的基站(EvolvedNodeB，eNB)节点可以自主获得必要的参数配置信息，从而完成自动配置。自优化功能是指在系统运行过程中，eNB通过用户设备(UserEquipment，UE)的测量结果以及性能测量信息，在运营商配置的参数范围内调整网络运行参数，从而适应网络环境的变化，达到优化网络性能的目的。自治愈功能是指系统拥有自检功能，同时检测到问题时能自主减轻或解决大多数问题，从而减少维护开销并尽可能避免对网络质量和用户感受的影响。SON technology mainly includes self-configuration (Self-Configuration), self-optimization (Self-Optimization) and self-healing (Self-Healing) three aspects. The self-configuration function means that a newly deployed base station (EvolvedNodeB, eNB) node can independently obtain necessary parameter configuration information, thereby completing automatic configuration. The self-optimization function means that during the operation of the system, the eNB adjusts the network operating parameters within the parameter range configured by the operator through the measurement results and performance measurement information of the user equipment (UE), so as to adapt to changes in the network environment and achieve optimization. Network Performance Purposes. The self-healing function means that the system has a self-inspection function, and at the same time, when a problem is detected, it can automatically alleviate or solve most problems, thereby reducing maintenance costs and avoiding the impact on network quality and user experience as much as possible.
自组织网络的工作目标包括移动鲁棒性优化(MRO)、移动负载均衡(MLB)、容量与覆盖优化(CCO)以及节能管理(ES)等等多个实例的具体方案实现，其中一个重要的实例即MRO。eNB的参数设置决定了切换门限、接入门限的大小等等，进而决定了切换(Handover，HO)和接入的难易程度。如果这些参数设置不合理，会导致UE在蜂窝小区间移动中发生不合理的切换如过早切换(TooEarlyHO)、过晚切换(TooLateHO)以及切换到错误小区(HOToAWrongCell)等导致发生无线链路失败(RadioLinkFailure，RLF)。在MRO过程中，eNB会对各个UE上报的RLF报告进行分析之后对其类型以及发生原因进行判定，并根据判定结果对切换参数进行动态调整，以最小化不合理切换以及RLF发生的概率，从而达到切换优化的目的，使UE得到更稳定优质的服务。The working objectives of the ad hoc network include the implementation of specific solutions for multiple instances such as Mobile Robustness Optimization (MRO), Mobile Load Balancing (MLB), Capacity and Coverage Optimization (CCO), and Energy Saving Management (ES), among which an important An example is MRO. The parameter setting of the eNB determines the handover threshold, the size of the access threshold, etc., and then determines the difficulty of handover (Handover, HO) and access. If these parameters are set unreasonably, unreasonable handovers such as too early handover (TooEarlyHO), too late handover (TooLateHO) and handover to the wrong cell (HOToAWrongCell) will occur when the UE moves between cells, resulting in wireless link failure. (RadioLink Failure, RLF). During the MRO process, the eNB will analyze the RLF report reported by each UE to determine its type and cause of occurrence, and dynamically adjust the handover parameters according to the determination result to minimize the probability of unreasonable handover and RLF occurrence, thereby The purpose of handover optimization is achieved, so that the UE can obtain more stable and high-quality services.
MRO技术针对不同场景的解决方案很多，现有技术的通用方法一般是基于A3不等式触发的切换方案，通过修改某些参数来影响切换的难易，进而通过参数调整来优化网络环境，提高切换性能。其中参数调整多为调节小区间偏移值(CellIndividualOffset，CIO)、触发时长(TimeToTrigger，TTT)以及小区迟滞参数(Hysteresis，Hyst)等等，不同的调整方法会产生不同的效果，所针对的具体方案也不同。而在统计中，大多方案针对过早切换、过晚切换、切换到错误小区以及乒乓切换等等错误同时进行检测，eNB需要分别处理，复杂度和处理成本较高，同时也会带有处理不及时等时效问题。其中在错误统计和处理中，由于多种错误共存且需要分别处理不同的参数调整，所以复杂度较大，不利于方案的实际实现。MRO technology has many solutions for different scenarios. The general method of the existing technology is generally based on the handover scheme triggered by the A3 inequality, which affects the difficulty of handover by modifying some parameters, and then optimizes the network environment through parameter adjustment to improve handover performance. . Among them, the parameter adjustment is mostly to adjust the inter-cell offset value (CellIndividualOffset, CIO), the trigger duration (TimeToTrigger, TTT), and the cell hysteresis parameter (Hysteresis, Hyst), etc. Different adjustment methods will produce different effects, and the specific The programs are also different. In statistics, most solutions detect errors such as premature handover, too late handover, handover to the wrong cell, and ping-pong handover at the same time. Timely and other issues of limitation. Among them, in error statistics and processing, due to the coexistence of various errors and the need to deal with different parameter adjustments separately, the complexity is relatively large, which is not conducive to the actual realization of the scheme.
发明内容Contents of the invention
本发明的目的在于克服上述现有技术的缺点，提供了一种易实现的基于切换统计的移动鲁棒性优化方法，该方法易于实现对移动鲁棒性的优化，同时优化过程简单、处理成本低。The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide an easy-to-implement mobile robustness optimization method based on handover statistics. Low.
为达到上述目的，本发明所述的易实现的基于切换统计的移动鲁棒性优化方法包括以下步骤:In order to achieve the above object, the easy-to-implement mobile robustness optimization method based on handover statistics of the present invention may further comprise the steps:
1)源小区基站统计用户终端向目标小区切换过程中发生过早切换、过晚切换、切换到错误小区以及成功切换的初始次数，并计算预设周期内用户终端成功切换的初始次数占总切换次数的比例，当所述比例小于预设比例时，则优化源小区基站内的Hyst或相应的CIO;1) The base station of the source cell counts the initial times of premature handover, too late handover, handover to the wrong cell, and successful handover during the handover process of the user terminal to the target cell, and calculates the initial number of successful handovers of the user terminal within the preset period as a percentage of the total handover The ratio of times, when the ratio is less than the preset ratio, then optimize the Hyst or the corresponding CIO in the base station of the source cell;
2)优化源小区基站内的Hyst或相应的CIO时，用户终端从源小区切换到错误小区的过程中，设源小区为cell1、错误目标小区为cell2、理想目标小区为cell3，则切换到错误小区的切换过程为从cell1切换至cell2，并从cell2切换至cell3，设定将用户终端从cell1切换到cell2记作一次过早切换，并将用户终端从cell1切换到cell3记作一次过晚切换;2) When optimizing the Hyst or the corresponding CIO in the base station of the source cell, in the process of switching the user terminal from the source cell to the wrong cell, set the source cell as cell1, the wrong target cell as cell2, and the ideal target cell as cell3, then switch to the wrong cell The handover process of the cell is from cell1 to cell2, and from cell2 to cell3. It is set that the handover of the user terminal from cell1 to cell2 is counted as a premature handover, and the handover of the user terminal from cell1 to cell3 is counted as a too late handover ;
3)重新统计用户终端在预设周期内发生过早切换及过晚切换的最终次数，当发生过早切换的最终次数大于或等于发生过晚切换的最终次数时，则采用过早切换的优化方法优化源小区基站内的Hyst或相应的CIO;当发生过早切换的最终次数小于发生过晚切换的最终次数时，则采用过晚切换的优化方法优化源小区基站内的Hyst或相应的CIO，然后再将优化后的Hyst及CIO重新设置到源小区基站内。3) Re-count the final number of premature handovers and too late handovers of the user terminal within the preset period, and when the final number of premature handovers is greater than or equal to the final number of too late handovers, the optimization of premature handovers is adopted The method optimizes the Hyst or the corresponding CIO in the base station of the source cell; when the final number of premature handovers is less than the final number of too late handovers, the optimization method of too late handover is used to optimize the Hyst or the corresponding CIO in the source cell base station , and then reset the optimized Hyst and CIO to the base station of the source cell.
所述过早切换的优化方法包括以下步骤:The optimization method of described premature switching comprises the following steps:
1)当发生过早切换的小区占所有相邻小区的比例大于或等于1/2时，则将源小区基站内的Hyst增大一个步长，其中源小区基站内的Hyst增大一个步长后小于或等于Hyst的预设最大阀值;当发生过早切换的小区占所有相邻小区的比例小于1/2时或者当源小区基站内的Hyst增大一个步长后大于Hyst的预设最大阀值时，则将发生过早切换的小区对应源小区基站内的CIO减少一个步长，其中，发生过早切换的小区对应源小区基站内的CIO减少一个步长后大于或等于CIO的预设最小阀值;当发生过早切换的小区对应源小区基站内的CIO减小一个步长后小于CIO的预设最小阀值时，则保持发生过早切换的小区对应源小区基站内的CIO不变，其中所有发生过早切换的小区对应源小区基站内的CIO减少一个步长后至少有一个大于或者等于CIO的预设最小阀值;1) When the proportion of the prematurely switched cell to all adjacent cells is greater than or equal to 1/2, the Hyst in the base station of the source cell is increased by one step, and the Hyst in the base station of the source cell is increased by one step After that, it is less than or equal to the preset maximum threshold of Hyst; when the proportion of cells with premature handover to all adjacent cells is less than 1/2 or when the Hyst in the base station of the source cell is increased by a step, it is greater than the preset value of Hyst When the maximum threshold is reached, the CIO in the base station of the source cell corresponding to the cell where the premature handover occurs is reduced by one step, wherein the CIO in the base station of the source cell corresponding to the cell where the premature handover occurs is reduced by one step and is greater than or equal to the CIO The preset minimum threshold; when the CIO in the base station corresponding to the source cell of the cell where the premature handover occurs is less than the preset minimum threshold value of CIO after being reduced by one step, the cell where the premature handover occurs corresponds to the CIO in the base station of the source cell The CIO remains unchanged, and at least one of the CIOs in the base station corresponding to the source cell of all the premature handovers is greater than or equal to the preset minimum threshold value of the CIO after being reduced by one step;
2)当所有发生过早切换的小区对应源小区基站内的CIO减少一个步长后均小于CIO的预设最小阀值时，则将源小区基站内CIO的预设最小阀值减少一个步长，然后再将所有发生过早切换的小区对应源小区基站内的CIO均减少一个步长，其中源小区基站内CIO的预设最小阀值减少一个步长后属于CIO的预设最小阀值的预设波动范围;当源小区基站内CIO的预设最小阀值减少一个步长后不属于CIO的预设最小阀值的预设波动范围时，则不对源小区基站内的Hyst及相应的CIO进行优化，并将本周期记录的数据计入下一周期。2) When the CIO in the base station of the source cell corresponding to all the prematurely handed over cells is less than the preset minimum threshold of CIO after being reduced by one step, the preset minimum threshold of CIO in the base station of the source cell is reduced by one step , and then reduce the CIO in the base station of the source cell corresponding to all the prematurely handed over cells by one step, where the preset minimum threshold of CIO in the base station of the source cell is reduced by one step, which belongs to the preset minimum threshold of CIO Preset fluctuation range; when the preset minimum threshold value of CIO in the base station of the source cell is reduced by one step and does not belong to the preset fluctuation range of the preset minimum threshold value of CIO, the Hyst in the base station of the source cell and the corresponding CIO Optimize and count the data recorded in this cycle into the next cycle.
所述过晚切换的优化方法包括以下步骤:The optimization method of described too late switching comprises the following steps:
1)当发生过晚切换的小区占所有相邻小区的比例大于或等于1/2时，则将源小区基站内的Hyst减少一个步长，其中源小区基站内的Hyst减少一个步长后大于或等于Hyst的预设最小阀值;当发生过晚切换的小区占所有相邻小区的比例小于1/2时或者源小区基站内的Hyst减少一个步长后小于Hyst的预设最小阀值时，则将发生过晚切换的小区对应源小区基站内的CIO增大一个步长，其中，发生过晚切换的小区对应源小区基站内的CIO增大一个步长后小于或等于CIO的预设最大阀值;当发生过晚切换的小区对应源小区基站内的CIO增大一个步长后大于CIO的预设最大阀值时，则保持发生过晚切换的小区对应源小区基站内的CIO不变，其中所有发生过晚切换的小区对应源小区基站内的CIO增大一个步长后至少有一个小于或等于CIO的预设最大阀值;1) When the ratio of the cell with too late handover to all adjacent cells is greater than or equal to 1/2, the Hyst in the base station of the source cell is reduced by one step, and the Hyst in the base station of the source cell is reduced by one step to be greater than Or equal to the preset minimum threshold value of Hyst; when the proportion of the cell with too late handover to all adjacent cells is less than 1/2 or when the Hyst in the base station of the source cell is reduced by one step and less than the preset minimum threshold value of Hyst , then the CIO in the base station of the source cell corresponding to the cell where the handover occurred too late is increased by one step, wherein the CIO in the base station of the source cell corresponding to the cell where the handover occurred too late is increased by one step and is less than or equal to the preset CIO Maximum threshold; when the CIO in the base station of the source cell corresponding to the cell where the too late handover occurs is greater than the preset maximum threshold of CIO after increasing by one step, keep the CIO in the base station of the source cell corresponding to the cell where the too late handover occurs In which, after the CIO in the base station of the corresponding source cell of all cells that have been handed over too late increases by one step, at least one of them is less than or equal to the preset maximum threshold of CIO;
2)当所有发生过晚切换的小区对应源小区基站内的CIO增大一个步长后均大于CIO的预设最大阀值时，则将源小区基站内的CIO预设最大阀值增大一个步长，然后再将所有发生过晚切换的小区对应源小区基站内的CIO均增大一个步长，其中源小区基站内CIO的预设最大阀值增大一个步长后属于CIO的预设最大阀值的预设波动范围;当源小区基站内CIO的预设最大阀值增大一个步长后不属于CIO的预设最大阀值的预设波动范围时，则不对源小区基站内的Hyst及相应的CIO进行优化，并将本周期记录的数据计入下一周期。2) When the CIO in the base station of the source cell corresponding to all the cells that have been handed over too late is greater than the preset maximum threshold of CIO after increasing by one step, the preset maximum threshold of CIO in the base station of the source cell is increased by one step, and then increase the CIO in the base station of the source cell for all cells that have been handed over too late by one step, where the preset maximum threshold of the CIO in the base station of the source cell is increased by one step and belongs to the preset value of the CIO The preset fluctuation range of the maximum threshold value; when the preset maximum threshold value of the CIO in the base station of the source cell increases by one step and does not belong to the preset fluctuation range of the preset maximum threshold value of the CIO, the Hyst and the corresponding CIO optimize and count the data recorded in this cycle into the next cycle.
本发明具有以下有益效果:The present invention has the following beneficial effects:
本发明所述的易实现的基于切换统计的移动鲁棒性优化方法通过源小区基站统计用户终端向目标小区切换过程中发生过早切换、过晚切换、切换到错误小区以及成功切换的次数，并根据发生过早切换、过晚切换、切换到错误小区以及成功切换的次数优化源小区基站内的Hyst或相应的CIO，在优化的过程中，将切换到错误小区记作一次过早切换及一次过晚切换，从而有效的降低源小区基站移动鲁棒性优化的复杂度，同时降低移动鲁棒性优化的成本，从而有利于技术过程的实现，进而可以有效的提高用户终端切换过程中的成功率。The easy-to-implement mobile robustness optimization method based on handover statistics of the present invention uses the source cell base station to count the number of premature handovers, too late handovers, handovers to wrong cells, and successful handovers that occur during the handover process of the user terminal to the target cell, And optimize the Hyst or corresponding CIO in the base station of the source cell according to the number of premature handover, too late handover, handover to the wrong cell, and successful handover. In the optimization process, the handover to the wrong cell is recorded as a premature handover and One too late handover, thereby effectively reducing the complexity of mobile robustness optimization of the base station of the source cell, and at the same time reducing the cost of mobile robustness optimization, which is conducive to the realization of the technical process, and can effectively improve the user terminal handover process. Success rate.
附图说明Description of drawings
图1为本发明的原理图;Fig. 1 is a schematic diagram of the present invention;
图2为本发明中过早切换的优化方法的流程图;Fig. 2 is the flowchart of the optimization method of premature switching in the present invention;
图3为本发明中过晚切换的优化方法的流程图;Fig. 3 is the flow chart of the optimization method of switching too late among the present invention;
图4为本发明的仿真结果图;Fig. 4 is the simulation result figure of the present invention;
图5为本发明中小区的分布图。Fig. 5 is a distribution diagram of cells in the present invention.
具体实施方式detailed description
下面结合附图对本发明做进一步详细描述:Below in conjunction with accompanying drawing, the present invention is described in further detail:
参考图1、图2及图3，源小区基站统计用户终端切换过程中发生过早切换、过晚切换、切换到错误小区以及成功切换的次数包括以下步骤:With reference to Fig. 1, Fig. 2 and Fig. 3, the number of times of premature handover, too late handover, handover to wrong cell and successful handover that occur in the source cell base station statistics user terminal handover process includes the following steps:
1)用户终端在各小区间移动过程中，根据A3不等式判断是否需要执行切换到相邻小区，所述A3不等式如下:1) During the mobile process of the user terminal between cells, it is judged according to the A3 inequality whether to perform handover to an adjacent cell, and the A3 inequality is as follows:
Mn-Mp＞Hyst-CIOp，n(1)Mn-Mp>Hyst-CIO p,n (1)
其中，Mn是邻小区n的信号强度(可以使用用户的参考信号接收功率值)，Mp是源小区p的信号强度，Hyst为源小区基站内预设的该测量事件的迟滞参数，CIOp，n为源小区基站内预设的源小区p为其相邻小区n设置的小区间偏移值;Wherein, Mn is the signal strength of the adjacent cell n (the user's reference signal received power value can be used), Mp is the signal strength of the source cell p, Hyst is the hysteresis parameter of the measurement event preset in the base station of the source cell, CIO p, n is the inter-cell offset value set by the preset source cell p in the base station of the source cell for its adjacent cell n;
2)当任一小区满足A3不等式时，用户终端则尝试由源小区向若干个相邻小区进行切换，直至成功切换至目标小区为止，然后源小区基站获取本次切换过程的相关信息，其中，目标小区为用户终端需要切换到的小区;2) When any cell satisfies the A3 inequality, the user terminal tries to switch from the source cell to several adjacent cells until it successfully switches to the target cell, and then the base station of the source cell obtains the relevant information of this handover process, wherein, The target cell is the cell to which the user terminal needs to be handed over;
3)源小区基站接收用户终端发送过来的相关信息，并判断本次切换过程中切换失败发生的场景，所述切换失败发生的场景包括过早切换、过晚切换及切换到错误小区。3) The base station of the source cell receives the relevant information sent by the user terminal, and judges the scene of the handover failure during the handover process. The scene of the handover failure includes premature handover, too late handover and handover to the wrong cell.
本发明所述的易实现的基于切换统计的移动鲁棒性优化方法，包括以下步骤:The easy-to-implement mobile robustness optimization method based on handover statistics of the present invention comprises the following steps:
1)源小区基站统计用户终端向目标小区切换过程中发生过早切换、过晚切换、切换到错误小区以及成功切换的初始次数，并计算预设周期内用户终端成功切换的初始次数占总切换次数的比例，当所述比例小于预设比例时，则优化源小区基站内的Hyst或相应的CIO;1) The base station of the source cell counts the initial times of premature handover, too late handover, handover to the wrong cell, and successful handover during the handover process of the user terminal to the target cell, and calculates the initial number of successful handovers of the user terminal within the preset period as a percentage of the total handover The ratio of times, when the ratio is less than the preset ratio, then optimize the Hyst or the corresponding CIO in the base station of the source cell;
2)优化源小区基站内的Hyst或相应的CIO时，用户终端从源小区切换到错误小区的过程中，设源小区为cell1、错误目标小区为cell2、理想目标小区为cell3，则切换到错误小区的切换过程为从cell1切换至cell2，并从cell2切换至cell3，设定将用户终端从cell1切换到cell2记作一次过早切换，并将用户终端从cell1切换到cell3记作一次过晚切换;2) When optimizing the Hyst or the corresponding CIO in the base station of the source cell, in the process of switching the user terminal from the source cell to the wrong cell, set the source cell as cell1, the wrong target cell as cell2, and the ideal target cell as cell3, then switch to the wrong cell The handover process of the cell is from cell1 to cell2, and from cell2 to cell3. It is set that the handover of the user terminal from cell1 to cell2 is counted as a premature handover, and the handover of the user terminal from cell1 to cell3 is counted as a too late handover ;
3)重新统计用户终端在预设周期内发生过早切换及过晚切换的最终次数，当发生过早切换的最终次数大于或等于发生过晚切换的最终次数时，则采用过早切换的优化方法优化源小区基站内的Hyst或相应的CIO;当发生过早切换的最终次数小于发生过晚切换的最终次数时，则采用过晚切换的优化方法优化源小区基站内的Hyst或相应的CIO，然后再将优化后的Hyst及CIO重新设置到源小区基站内。3) Re-count the final number of premature handovers and too late handovers of the user terminal within the preset period, and when the final number of premature handovers is greater than or equal to the final number of too late handovers, the optimization of premature handovers is adopted The method optimizes the Hyst or the corresponding CIO in the base station of the source cell; when the final number of premature handovers is less than the final number of too late handovers, the optimization method of too late handover is used to optimize the Hyst or the corresponding CIO in the source cell base station , and then reset the optimized Hyst and CIO to the base station of the source cell.
所述过早切换的优化方法包括以下步骤:The optimization method of described premature switching comprises the following steps:
1)当发生过早切换的小区占所有相邻小区的比例大于或等于1/2时，则将源小区基站内的Hyst增大一个步长，其中源小区基站内的Hyst增大一个步长后小于或等于Hyst的预设最大阀值;当发生过早切换的小区占所有相邻小区的比例小于1/2时或者当源小区基站内的Hyst增大一个步长后大于Hyst的预设最大阀值时，则将发生过早切换的小区对应源小区基站内的CIO减少一个步长，其中，发生过早切换的小区对应源小区基站内的CIO减少一个步长后大于或等于CIO的预设最小阀值;当发生过早切换的小区对应源小区基站内的CIO减小一个步长后小于CIO的预设最小阀值时，则保持发生过早切换的小区对应源小区基站内的CIO不变，其中所有发生过早切换的小区对应源小区基站内的CIO减少一个步长后至少有一个大于或者等于CIO的预设最小阀值;1) When the proportion of the prematurely switched cell to all adjacent cells is greater than or equal to 1/2, the Hyst in the base station of the source cell is increased by one step, and the Hyst in the base station of the source cell is increased by one step After that, it is less than or equal to the preset maximum threshold of Hyst; when the proportion of cells with premature handover to all adjacent cells is less than 1/2 or when the Hyst in the base station of the source cell is increased by a step, it is greater than the preset value of Hyst When the maximum threshold is reached, the CIO in the base station of the source cell corresponding to the cell where the premature handover occurs is reduced by one step, wherein the CIO in the base station of the source cell corresponding to the cell where the premature handover occurs is reduced by one step and is greater than or equal to the CIO The preset minimum threshold; when the CIO in the base station corresponding to the source cell of the cell where the premature handover occurs is less than the preset minimum threshold value of CIO after being reduced by one step, the cell where the premature handover occurs corresponds to the CIO in the base station of the source cell The CIO remains unchanged, and at least one of the CIOs in the base station corresponding to the source cell of all the premature handovers is greater than or equal to the preset minimum threshold value of the CIO after being reduced by one step;
2)当所有发生过早切换的小区对应源小区基站内的CIO减少一个步长后均小于CIO的预设最小阀值时，则将源小区基站内CIO的预设最小阀值减少一个步长，然后再将所有发生过早切换的小区对应源小区基站内的CIO均减少一个步长，其中源小区基站内CIO的预设最小阀值减少一个步长后属于CIO的预设最小阀值的预设波动范围;当源小区基站内CIO的预设最小阀值减少一个步长后不属于CIO的预设最小阀值的预设波动范围时，则不对源小区基站内的Hyst及相应的CIO进行优化，并将本周期记录的数据计入下一周期。2) When the CIO in the base station of the source cell corresponding to all the prematurely handed over cells is less than the preset minimum threshold of CIO after being reduced by one step, the preset minimum threshold of CIO in the base station of the source cell is reduced by one step , and then reduce the CIO in the base station of the source cell corresponding to all the prematurely handed over cells by one step, where the preset minimum threshold of CIO in the base station of the source cell is reduced by one step, which belongs to the preset minimum threshold of CIO Preset fluctuation range; when the preset minimum threshold value of CIO in the base station of the source cell is reduced by one step and does not belong to the preset fluctuation range of the preset minimum threshold value of CIO, the Hyst in the base station of the source cell and the corresponding CIO Optimize and count the data recorded in this cycle into the next cycle.
所述过晚切换的优化方法包括以下步骤:The optimization method of described too late switching comprises the following steps:
1)当发生过晚切换的小区占所有相邻小区的比例大于或等于1/2时，则将源小区基站内的Hyst减少一个步长，其中源小区基站内的Hyst减少一个步长后大于或等于Hyst的预设最小阀值;当发生过晚切换的小区占所有相邻小区的比例小于1/2时或者源小区基站内的Hyst减少一个步长后小于Hyst的预设最小阀值时，则将发生过晚切换的小区对应源小区基站内的CIO增大一个步长，其中，发生过晚切换的小区对应源小区基站内的CIO增大一个步长后小于或等于CIO的预设最大阀值;当发生过晚切换的小区对应源小区基站内的CIO增大一个步长后大于CIO的预设最大阀值时，则保持发生过晚切换的小区对应源小区基站内的CIO不变，其中所有发生过晚切换的小区对应源小区基站内的CIO增大一个步长后至少有一个小于或等于CIO的预设最大阀值;1) When the ratio of the cell with too late handover to all adjacent cells is greater than or equal to 1/2, the Hyst in the base station of the source cell is reduced by one step, and the Hyst in the base station of the source cell is reduced by one step to be greater than Or equal to the preset minimum threshold value of Hyst; when the proportion of the cell with too late handover to all adjacent cells is less than 1/2 or when the Hyst in the base station of the source cell is reduced by one step and less than the preset minimum threshold value of Hyst , then the CIO in the base station of the source cell corresponding to the cell where the handover occurred too late is increased by one step, wherein the CIO in the base station of the source cell corresponding to the cell where the handover occurred too late is increased by one step and is less than or equal to the preset CIO Maximum threshold; when the CIO in the base station of the source cell corresponding to the cell where the too late handover occurs is greater than the preset maximum threshold of CIO after increasing by one step, keep the CIO in the base station of the source cell corresponding to the cell where the too late handover occurs In which, after the CIO in the base station of the corresponding source cell of all cells that have been handed over too late increases by one step, at least one of them is less than or equal to the preset maximum threshold of CIO;
2)当所有发生过晚切换的小区对应源小区基站内的CIO增大一个步长后均大于CIO的预设最大阀值时，则将源小区基站内的CIO预设最大阀值增大一个步长，然后再将所有发生过晚切换的小区对应源小区基站内的CIO均增大一个步长，其中源小区基站内CIO的预设最大阀值增大一个步长后属于CIO的预设最大阀值的预设波动范围;当源小区基站内CIO的预设最大阀值增大一个步长后不属于CIO的预设最大阀值的预设波动范围时，则不对源小区基站内的Hyst及相应的CIO进行优化，并将本周期记录的数据计入下一周期。2) When the CIO in the base station of the source cell corresponding to all the cells that have been handed over too late is greater than the preset maximum threshold of CIO after increasing by one step, the preset maximum threshold of CIO in the base station of the source cell is increased by one step, and then increase the CIO in the base station of the source cell for all cells that have been handed over too late by one step, where the preset maximum threshold of the CIO in the base station of the source cell is increased by one step and belongs to the preset value of the CIO The preset fluctuation range of the maximum threshold value; when the preset maximum threshold value of the CIO in the base station of the source cell increases by one step and does not belong to the preset fluctuation range of the preset maximum threshold value of the CIO, the Hyst and the corresponding CIO optimize and count the data recorded in this cycle into the next cycle.
参考图4及图5，通过在仿真平台上进行模拟仿真，根据结果来看，算法取得了良好的效果，仿真场景为19小区，每小区中心有一个基站，小区中不再划分扇区，采用系统级网络仿真模拟多用户在小区中的通信行为，其中包括对用户业务生成、移动模型、信道模型、同频干扰等等无线通信基本环节的模拟和评估，每个小区用户均为10个，考虑到小区的边界效应，统计过程中只统计中心7小区的状况，模拟仿真时长可以根据需要进行设置，这里设置为2小时，一次仿真的结果如图4所示。Referring to Fig. 4 and Fig. 5, through the simulation on the simulation platform, according to the results, the algorithm has achieved good results. The simulation scene is 19 cells, and there is a base station in the center of each cell. The cells are no longer divided into sectors. System-level network simulation simulates the communication behavior of multiple users in a cell, including the simulation and evaluation of basic wireless communication links such as user service generation, mobility model, channel model, and co-channel interference. Each cell has 10 users, Considering the boundary effect of the cell, only the 7 cells in the center are counted in the statistical process, and the simulation duration can be set as required, here it is set to 2 hours, and the result of one simulation is shown in Figure 4.
根据图4的结果可以看出，在参数设置(初始值:Hyst＝0dB，CIO＝5dB，可调整，均有良好效果)不合理时，本发明可以有效的提高切换成功率，同时在切换成功率小于预设值时，能够通过参数调整实现系统切换的优化。Can find out according to the result of Fig. 4, when the parameter setting (initial value: Hyst=0dB, CIO=5dB, adjustable, all have good effect) is unreasonable, the present invention can effectively improve handover success rate, simultaneously in handover success When the rate is less than the preset value, the optimization of the system switching can be realized through parameter adjustment.
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