CDMA短信业务信道承载方案及其应用

本文从提高CDMA网络的重点指标——寻呼成功率入手,根据短信下发方式及对寻呼的影响展开深入研究,找出短信影响网络寻呼的关键之所在,据此提出相应的技术手段,以调整短信路由方式,从而达到提高寻呼成功率的目的。     

CDMA网PRL更新原理及典型案例分析

文章对CDMA网PRL更新原理、手机开机选网登记流程,以及PRL对国际漫游的影响进行了深入分析,接着列举了日常PRL更新异常案例并加以分析,最后,对目前PRL更新机制和选网流程提出改进意见。     

CDMA网络承载短信群发业务的解决方案

针对cdma20001×、GSM、WCDMA等制式对短信群发业务的承载能力进行分析,提出在CDMA网络上高效率承载短信群发业务的端到端解决方案,并通过现网应用证明了该方案的可行性。     

CDMA网络短信寻呼成功率的提升策略

CDMA短信寻呼成功率是总部必须考核的指标之一,其得分直接影响到其他众多考核指标。以某市CDMA网络为例,统计分析寻呼成功率低的原因,提出了CDMA短信寻呼成功率的提升策略。测试验证结果表明：短信寻呼成功率上升明显。     

高峰期短信业务量对网络的影响及解决方法

文章结合现网无线侧短信传送占用信道类型及数据分析,分析CDMA网络高峰期短信业务量对网络指标的影响,并提出相关网优解决措施。     

阿朗CDMA软交换设备完全业务信道短信下发机制分析和实现

就阿朗CDMA核心软交换引入后的短信下发机制进行了分析,并提出更改阿朗设备核心网参数,控制短信MT全部从业务信道下发,以减小寻呼信道的负荷。通过追踪前后短信MT相关SMRG数据,比较MT在完全业务信道下发和部分通过寻呼信道下发的相关指标差异,从而确认参数修改对降低寻呼信道负荷的效果和其它短信相关性能所受影响。     

CDMA网络移动交换机系统间短消息寻呼技术研究及应用

研究并提出了CDMA网络移动交换机系统间短消息寻呼的技术要求,主要描述了CDMA网络移动交换机系统间短消息寻呼对服务交换机、相邻交换机技术的要求、呼叫流程等,并对该技术在现网的实际应用效果进行了评估。本文所述的CDMA网络短消息系统间寻呼技术能明显改善CDMA网络MT短消息的首发寻呼成功率。     

CDMA2000 1X短信广播原理及可行性浅探

文章分析了CDMA2000 1X短信广播的技术原理,然后对CDMA2000 1X短信广播应用可能存在的问题进行分析,最后提出CDMA2000 1X短信广播应用建议。     

CDMA网边界漫游欢迎短信问题的解决方案

从漫游欢迎短信实现机制着手,详细分析了漫游＂骚扰＂短信问题产生的原因,详细论述了修改VLR软参及引入A接口信令消息监测2种解决方案,并根据现网实际提出了推荐方案。     

广西CDMA网PPP指标优化浅析

分析了影响CDMA网分组域指标PPP连接成功率的各种因素，并对广西CDMA网的PPP连接失败的实例进行了分析，提出了提高广西PPP连接成功率的方法，实施后取得了显著效果。     

移动GSM网络寻呼成功率参数优化

移动通信的网络质量越来越受到关注,运营商对网络性能指标的稳定性要求越来越高,尤其是涉及到用户感知的指标,例如寻呼成功率、接通率、掉话率等,都提出了很高的要求。文章对影响用户感知的重要指标寻呼成功率进行了分析。从分析影响GSM网络寻呼成功率的原因人手,找到寻呼成功率的参数优化方法。通过无线寻呼参数的优化,使寻呼成功率明显提高,达到预期的目的,提高用户感知。     

切换成功率的改善

从现网统计发现同步切换与异步切换的切出数量比大约是1：4,异步切换的切出成功率比同步切换的切出成功率高1．6％,为了提高切出成功率,通过对同步切换的切出成功率低的原因进行细致分析,得出将同步切换调整为异步切换的合理性,并在现网推广实施后,有效改善了切出成功率。     

移动自组织网络中一种基于新型节点模型的组合服务提供方法（英文）

Composite service provision in mobile ad hoc networks encounters great challenges and its success rate is not satisfactory because the nodes' locations are dynamic and the nodes maybe unavailable at any time.Composite service is built through the service composition.In mobile ad hoc networks,the factors influencing the success rate of service composition are mainly the number of nodes and the time spent for the composition.The node's failure probability is proportional to the length of time the node exist in the networks.In order to improve the success rate of service composition,we take several measures.First,we split the service requirement into several segments and cluster the nodes,so that the nodes' waiting time for service composition can be reduced.Second,we propose a new node model of "one node contains multiple services" in mobile ad hoc networks.Using this type of nodes model,the number of nodes required for service composition can be reduced.These means can increase the success rate of service composition.     

GSM网络长途来电接通率之研究

介绍了GSM网络中影响长途来电接通率的相关因素。主要从网络拓扑结构、被叫用户关机状态、用户的位置区更新、寻呼方式以及A接口的信令平衡等这五个方面分析对接通率的影响,针对每一种影响因素,给出了相应的解决方案。对于网络位置区码（LAC）的作用及范围、边界的划分方法。建议解决好以上若干因素引起的影响,并根据信令跟踪的结果,有针对性的去改善网络质量,从而提升寻呼成功率及接通率。     

一种话音自动呼叫系统的设计与实现

介绍了一种话音自动呼叫系统,其硬件系统主要由数字信号处理器、中继接口电路和单片机组成。本系统通过控制中继口电路完成摘机,利用按键输入被叫号码,通过数字信号处理器产生双音多频信号完成拨号,模拟实现电话呼叫。通过检测对端回送的信号音,判定一次呼叫是否成功,完成系统呼通率的测试,并将结果实时输出到监控屏上显示。利用该系统可以便利、准确地对话音通信系统呼叫成功率进行测试,还可以节省大量的人工成本。     

Facial Recognition From Volume-Rendered Magnetic Resonance Imaging Data

Three-dimensional (3-D) reconstructions of computed tomography (CT) and magnetic resonance (MR) brain imaging studies are a routine component of both clinical practice and clinical and translational research. A side effect of such reconstructions is the creation of a potentially recognizable face. The Health Insurance Portability and Accountability Act of 1996 (HIPAA) Privacy Rule requires that individually identifiable health information may not be used for research unless identifiers that may be associated with the health information including ldquoFull face photographic images and other comparable imagesrdquo are removed (de-identification). Thus, a key question is: Are reconstructed facial images comparable to full-face photographs for the purpose of identification? To address this question, MR images were selected from existing research repositories and subjects were asked to pair an MR reconstruction with one of 40 photographs. The chance probability that an observer could match a photograph with its 3-D MR image was 1 in 40 (0.025), and we considered 4 successes out of 40 (4/40, 0.1) to indicate that a subject could identify persons' faces from their 3-D MR images. Forty percent of the subjects were able to successfully match photographs with MR images with success rates higher than the null hypothesis success rate. The Blyth-Still-Casella 95% confidence interval for the 40% success rate was 29%-52%, and the 40% success rate was significantly higher (P< 0.001) than our null hypothesis success rate of 1 in 10 (0.10).     

Digital modulation recognition based on instantaneous information

A new digital modulation recognition algorithm based on the instantaneous information is proposed to improve the recognition success rate in the low signal noise ratio(SNR).First denoising of the instantaneous information is optimized by wavelet filter,which can improve the recognition ability at low SNR.Besides the existing 3 key feature parameters,3 new key feature parameters are proposed to be used as the decision criteria for identifying different types of digital modulation,which simplifies the recognition process and improves the recognition ability at low SNR.The simulations demonstrate that all modulation types of interest have been classified with success rate of no lower than 99% when SNR is 10dB.Even if the SNR is lower than 5 dB,the success rate is over 95.4% for most of the modulation types.     

优化GSM系统中低SNR环境下的同步算法

为了优化全球移动通信系统中低信噪比环境下的同步算法,采用高斯滤波最小移频键控调制信号的改进同步算法,得到了信号同步成功率对比图.结果表明,在接收端对高斯滤波最小移频键控调制信号先进行相位反旋转,再对其进行符号化,最后应用滑动相关同步过程的同步算法,比传统基于训练序列的滑动相关同步算法成功率高,不但可以大幅提高低信噪比情况下同步成功率,而且简化了门限计算过程.这一结果对信噪比环境下的信号调制具有重要的意义.     

Rate adaptive protocol for multirate IEEE 802.11 networks

In this paper, a rate adaptive protocol AMARF (Adaptive Multirate Auto Rate Fallback) for multirate IEEE 802.11 networks is proposed. In AMARF, each data rate is assigned a unique success threshold, which is a criterion to judge when to switch a rate to the next higher one, and the success thresholds can be adjusted dynamically in an adaptive manner according to the running conditions, such as packet length and channel parameters. Moreover, the proposed protocol can be implemented by software without any change to the current IEEE 802.11 standards. Simulation result shows that AMARF yields significantly higher throughput than other existing schemes including ARF and its variants, in various running conditions.     

基于DSR的WCDMA软切换成功率的优化

通过收集与分析检测集报告,服务小区的邻区关系可以进一步完善,从而提高软切换成功率,降低掉话率,并通过应用取得了很好的效果。