5G网络基于UDT信令跟踪的TRP覆盖问题识别方法研究

传统的4G优化方法难以发现Hyper cell小区内存在的弱覆盖、越区覆盖、乒乓切换、重叠覆盖等相关问题,NR网络中提出了TRP传输和接收节点概念,将多个TRP合并成一个逻辑小区并称之为合并小区Hyper cell,本研究通过引入基于UDT信令跟踪的TRP问题识别方法,对5G Hyper cell内的TRP覆盖问题进行分析研究,能够准确有效地发现小区内TRP间存在的问题,开展针对性优化,提升网络质量及业务体验,为5G网络优化提供强有力的问题识别手段。     

关于GSM网络小区的完整性测试

1前言 随着我国通信行业GSM网络建设的基本完成。对GSM网络设备的维护和网络优化工作的要求已越来越高。在对GSM无线网络质量的评估方面。我们常用“CQT(Call Quality Test)测试”和“DT(Drive Test)测试”的方法。同时,对基站小区的覆盖情况和小区射频信号质量的评估也主要由这两种     

基于TA值的LTE小区覆盖研究

针对传统的判定越区覆盖方法的局限性,本文提出了一种基于TimeAdvanced(TA)值的越区覆盖判定方法,利用TA的指标统计和数理统计方法,通过量化随机变量和构建评估模型,归一化样本容量,来确定参考小区方差的区间估计,并以置信区间的上限作为判定阈值,判断待评估小区是否存在越区覆盖.实际的验证分析表明,该方法能快速准确地判定小区是否覆盖合理,具有较好的实用性.     

高铁小区重叠覆盖区域探讨

铁路小区间的重叠覆盖问题成为影响高铁网络质量的一个重要因素。重叠覆盖过短,会造成空闲模式脱网,通话模式不能及时切换等问题;重叠覆盖过大,会造成频繁切换,同样影响通话质量,所以对小区的重叠覆盖问题也需要一定的评估标准。本文基于路测对高铁小区GSM/TD- SCDMA/TD- LTE不同制式的重叠覆盖区域进行探讨,为高铁基站规划提供站间距的估算。     

TD-LTE网络结构评估方法研究及预规划分析

TD-LTE作为同频组网系统,网络结构对其无线网络质量有着重要的影响。而在基于TD-SCDMA或GSM现网基础上进行TD-LTE建设时,会由于传统网络结构无法达到TD-LTE同频组网结构要求而造成网络质量下降。对此,本文提出了一种TD-LTE网络结构评估方法,通过对TD-SCDMA及GSM现网数据进行分析预测得到TD-LTE网络性能及其弱覆盖、重叠覆盖、干扰小区等网络结构指标。该方法可以对TD-LTE网络性能进行准确的评估,从而提升网络结构评估的准确性和实用性。     

基站越区覆盖的控制

对基站越区覆盖对移动通信网络的影响进行了分析,研究了如何通过各种工具来分析评估基站的越区覆盖,并提出控制基站越区覆盖的方法.     

基于MR的无线移动智能网络优化平台的设计与实现

蜂窝移动通信网络的快速增长,使无线网络的优化设计问题日益重要。基于TD-SCDMA、GSM等无线移动网络的Abis或Iu-b接口中实时采集的信令MR帧,对MR帧进行同步解析,并由提取的帧结构中的数据,构建了无线移动智能网络优化平台。该无线移动智能网络优化平台利用MR测量报告信息能快速定位出TD-SCDMA移动通信网络当中的故障问题。该智能网络优化平台提供了一种新的越区检测算法实现,并能够对越区覆盖和弱覆盖进行检测和优化。     

跳频技术的基本原理及其在GSM网络中的应用

简要介绍跳频技术的基本原理。然后结合实际的GSM系统,针对存在越区覆盖的农村地区,分析启用跳频技术对改善网络运行质量的作用。     

基于加权泰森多边形的GSM网络优化算法研究

针对GSM网络替换中出现的掉话现象多、切换问题严重、重叠覆盖严重和越区覆盖等问题,本文提出了一种基于加权泰森多边形的GSM网络优化算法,并对传统的泰森多边形算法进行了三点改进。该算法结合MR数据,求解出每个扇区的逻辑位置,然后通过引入泰森多边形算法,分别构建替换前后物理位置和逻辑位置的泰森多边形,通过观察相互之间的偏差与无线网络优化指标的关系确定GSM替换后的优化方案。最后以甘肃省兰州市安宁区簇一为研究对象,根据该算法对GSM网络替换进行指导和GSM替换后的网络进行优化。结果表明,该算法达到了预期的目的,简单方便,直观明了,具有较强的适用性,对网络优化具有普遍的指导意义。     

TD—SCDMA网络基于小区更新的掉话率分析

影响TD—SCDMA掉话率的主要原因有干扰,邻区切换关系错配、漏配,弱覆盖,小区越区覆盖等,本文从“小区更新（CELL—UPDATE）”的角度出发,判断TD—SCDMA掉话的具体原因并做相应优化调整,有效降低了TD—SCDMA网络的掉话率。     

CDMA2000网络覆盖典型问题分析与优化

网络覆盖状况是衡量移动通信网络性能优劣的关键,CDMA2000网络的覆盖、容量和质量相互制约。在参与中国电信CDMA2000网络优化过程中,整理了部分与覆盖问题有关的案例,对网络覆盖中的典型问题之弱覆盖、越区覆盖、前反向链路不平衡及导频污染的现象、判断依据及优化方法进行了分析,并列举了相关实例,对从事网络优化工作者有一定的借鉴意义。     

Cell Planning in WCDMA Networks for Service Specific Coverage and Load Balancing

Third-generation (3G) Wideband Code Division Multiple Access network is an evolutionary network which supports services from circuit-based voice service to high and low rate packet-based data services. Unlike the voice oriented second-generation service, the 3G network is enhanced to support services with different data rate, different asymmetry, and different coverage. We thus need to investigate the coverage of multiple services and the capacity of a cell in cell planning for the advanced network. Service specific uplink coverage and downlink capacity with load balancing are considered in our cell planning. The problem is formulated as a linear integer programming optimization model. An efficient tabu search heuristic is developed to solve the NP-hard problem. Very promising computational results are demonstrated, where the solution gap from the optimal to the lower bound by CPLEX is within 0.9% in problems to cover all service traffic in the system. It is demonstrated that higher load factor effectively reduces cell sites for multiple service classes. Load balancing among cells is also demonstrated with different coverage ratio.     

CDR定位语音掉话问题的方法总结

CDR（Call Detailed Record）呼叫详细日志记录了现网中所有手机每次呼叫和释放时的特性和关键事件。针对四种常见的语音掉话原因：弱覆盖、导频污染、越区覆盖和邻区关系不合理,本文介绍利用cdma2000网优平台的CDR数据进行语音掉话问题定位的一些方法。     

An energy efficient hole repair node scheduling algorithm for WSN

A sensor node in the wireless sensor network has limited energy and it normally cannot be replaced due to the random deployment, so how to prolong the network life time with limited energy while satisfying the coverage quality simultaneously becomes a crucial problem to solve for wireless sensor networks (WSN). In this work, we propose an energy efficient algorithm based on the sentinel scheme to reduce the sleeping node detection density by defining a new deep sleeping state for each sensor node. The average energy consumed by probing neighboring nodes is introduced as a factor to calculate the detection rate. In addition, after some theoretical analysis of the existence of coverage holes in WSN, a triangle coverage repair procedure is defined to repair coverage holes. Simulation results show that our proposed algorithm obtained better performance in terms of the coverage quality and network life time compared with some existing algorithms in the literature.     

一种5G室内覆盖解决方案

室内覆盖是5G网络部署中的重点和难点。通过分析5G大规模天线系统的技术特点以及对室内覆盖的性能提升,提出室外宏基站仍是室内浅层覆盖的重要解决手段,并根据外场测试结果对理论分析进行佐证。同时根据覆盖需求使用有源室分和小基站等手段,构建完整的室分解决方案。     

基于NB-IoT网络覆盖的最小投资方法研究

构建了NB-IoT网络与需求满足度的评估体系,该体系基于有4G覆盖区域的A-GPS MR数据和无覆盖区域的仿真预测,考虑了网络制式的覆盖差异因子、不同典型场景覆盖差异因子及不同承载频率的覆盖差异因子,形成20×20 m的、可迭代更新的底层NB-IoT网络覆盖数据库,并利用最小投资算法成功实现NB-IoT网络与市场满足度评估以及最小开站规模评估,实现网络覆盖评估和投资效益最大化,加快5G的mMTC场景应用业务推广。     

武汉城市圈信息资源共享网络联盟研究

武汉城市圈信息资源共享网络呈垂直分布,不利于跨系统、跨地域信息资源充分共享.建立一个实质性的图书馆联盟,是发展武汉城市圈信息资源共享网络的有效途径.     

Energy-efficient placement and sleep control of relay nodes in heterogeneous small cell networks

Small cell (SC) provides low-power radio access with a relatively smaller coverage range than a macrocell. It has been regarded as a key solution for offloading traffic in the future 5G system. Previous works on energy-efficient placement of base stations (BSs) in cellular networks introduced placement and sleep control of low-power relay stations (RSs) to reduce the total power consumption for downlink transmission from BSs to users. As compared with legacy RSs, SC can serve as an RS with a larger coverage range though consuming a bit more circuit power. Hence, this work additionally considers to deploy small cells (SCs) in a one-dimensional highway cellular network with BSs and legacy RSs, and further models the power consumption minimization problem for placement and sleep control of legacy RSs and SCs in this network. Since the problem is hard to be solved analytically, a genetic algorithm with dynamic operator-selection mechanism is further proposed to resolve this problem. Performance of the proposed algorithm is evaluated via simulation with a practical experimental parameter setting.     

Towards intelligent geographic load balancing for mobile cellular networks

We investigate a novel geographic load-balancing scheme for cellular networks that intelligently changes cellular coverage according to the geographic traffic distribution in real time. A cooperative negotiation approach for the real-time control of cellular network coverage is described. The performance of the whole cellular network is improved by contracting and shaping the antenna radiation pattern around a traffic "hot spot" and expanding adjacent cells coverage to fill in the coverage loss. By the use of real time cooperative negotiations between base stations and associated antennas, a near optimal local coverage agreement is reached in the context of the whole cellular network. Results showing the advantage of this technique are presented. Global optimization using constrained real-coded genetic algorithms (RCGA) provides a benchmark. Convergence using penalty functions to manage the constraints was first investigated but gave poor results. A transformation of the problem space is used to remove the constraints, and a criterion that is necessary for successful transformations is explained.     

Optimising CDMA Cell Planning with Soft Handover

Soft handover (SHO) is one of the fundamental features of code division multiple access (CDMA) systems such as universal mobile telecommunication system (UMTS), and it is affected by the placement and density of cells. Inclusion of soft handover in optimization models for UMTS and CDMA cell site selection and configuration has previously been very limited but it is important for coverage because it can provide gain to the user. Some authors have excluded SHO on the basis of tractability while others have found that omitting SHO in planning gives adequate solutions. As such the incorporation of SHO remains an important component for definitive investigation in optimisation models for cell planning. In this paper we focus on the problem and effect of including SHO in cell planning optimisation. We introduce a new cell planning optimisation model that explicitly incorporates SHO and reduces computational complexity. Exact results can be obtained when the orthogonality factor is zero, while a conservative approximation of interference is used to generate lower bounds on coverage in the general case. We demonstrate the tractability of this model and show that it leads to improved lower bounds for coverage maximisation in network planning.