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。     

ATM网络中宽带与窄带业务的呼叫接入平衡机制

该文提出了一种简单的呼叫接入平衡机制。接入平衡机制配合CAC使用可以保证各类呼叫平等地接入网络。并分析了在这种机制下当ATM网络中的业务流量接近满负荷时,宽带业务的呼叫对窄带业务呼叫的阻塞概率。分析表明,这种平衡机制可以避免一种呼叫排挤另一种呼叫的现象发生。分析的结论对于在实践中制定合理的呼叫接纳和拒绝策略具有实际意义。     

一种3G中基于三层数据库的呼叫建立机制研究

基于3G网络三层数据库结构中GLR (Gateway Location Register)服务区远大于VLR (Visitor Location Register)服务区的情况,考虑被呼业务本地化(即本地移动用户呼叫本地移动用户的比例占总呼叫数的比例大),通过在GLR中设置缓存的方法,给出了一种新的呼叫建立机制。建立分析模型得到新机制的总代价函数和总时间延迟函数,并同基本呼叫建立机制以及2G网络基于VLR缓存的呼叫建立机制进行了对比分析,验证了新呼叫建立机制的优越性。     

半导体环形激光器的输出耦合及阈值增益分析

通过三维光波导的模式耦合理论分析了半导体环形激光器(SRL)与直波导的耦合系数,用耦合系数的解析表达式结合SRL自再现条件分析了SRL各参数对阈值增益的影响.分析结果表明,耦合系数随波导宽度和厚度、波导间距的增大而减小,随SRL半径的增大而增大;阈值增益随波导宽度和厚度、波导间距的增大而增大,随SRL半径的增大而减小.     

基于Rao检验的信号统计分辨界分析

针对基于广义似然比检验(GLRT)的信号统计分辨界(SRL)分析存在计算较复杂、难以得到检测统计量解析表达式等问题,提出了一种基于Rao检测的SRL分析方法.分析了噪声方差已知和未知两种情形下的信号一维方位角SRL以及噪声方差已知时的信号二维方位角及俯仰角SRL,推导得到了Rao检测统计量以及对应SRL所需的最小信噪比(SNR),分析了检测性能、计算复杂度,并与GLRT方法进行了对比.仿真实验验证了Rao检测方法的有效性.     

用于程控交换机呼叫模拟的事件表驱动实时模拟法

本文提出一种程控交换机呼叫模拟的有效方法——事件表驱动实时模拟法。它采用事件表的形式由软件生成强度和参数可调的呼叫流直接注入呼叫处理机,利用“时间 冻结”技术保证模拟的实时性,实现在没有话路硬设备的情况下,对不同话务强度的各种呼叫类型和呼叫混合进行实时模拟。文章还根据典型的话务数据对模拟的时空效率进行了计算,计算结果表明所提出的方法是实际可行的。该方法已成功地应用于国产中大容量程控交换机环境模拟器的研制,为程控交换机软件差错检测和呼叫处理能力的测定提供了有效的手段。     

S1240交换机呼叫处理程序的分析

详细讨论了Ｓ１２４０交换机呼叫处理程序各组成部分的功能、实现原理及呼叫处理过程。     

分布式DCM模型中呼叫控制的研究

分析了与连接分离后呼叫的特性，详细介绍了呼叫使用的协议和呼叫实现的过程，并讨论了呼叫在遇到不同问题时的处理策略。     

新品展台

思博伦通信推出Abacus分布式IP电话测试平台思博伦通信近日推出分布式AbacusIP电话测试平台,该平台可以避免逐站点测试造成的时间和资源的浪费,实现对服务提供商和企业的预生产网络全面、迅速和集中式的测试,它可将多个IP电话测试系统作为一个虚拟平台来对待,可以测试IP、混合IP、公共交换电话网(PSTN)及网络基础设施传送语音流时的效率。该测试平台还提供各种统计数据,如抖动、延时和数据包丢失等网络统计数据,呼叫建立、呼叫完成百分比和呼叫终止原因等呼叫测量统计数据,以及MOS、PESQ和R值等语音质量指标。AbacusIP测试平台可…     

智能公话系统数字平台呼叫接入服务器的设计与实现

本文设计的数字接入服务器能够完成用户认证、授权、加密、业务访问和计费,代理网络业务,接受用户发出的请求、建立会话、连接控制、业务逻辑维护等功能.本文还提出了智能公话系统数字运营平台的设计思想和整体结构.并根据智能公话系统数字运用平台的功能需求完成了数字呼叫接入服务器的设计和实现.数字呼叫接入服务器是整个平台系统的关键,系统只有在呼叫接入服务器的控制下协同工作,才能为用户提供丰富多样的业务.     

InAs/GaAs quantum dots grown on different GaAs substrates with graded InxGa1-xAs strain-reducing layer

Self-assembled InAs quantum dots with graded composition strain-reducing layer (SRL) grown on exact substrates were studied. It is shown that a graded InxGa1-xAs SRL leads to growth quality improvement, emission efficiency enhancement, and wavelength blueshift. Samples grown on 2° misoriented substrates with different In contents in graded InxGa1-xAs SRL were also investigated, and emission efficiency enhancement and wavelength blueshift were found when graded SRL was introduced and when the change rate of In content in graded InxGa1-xAs SRL was enlarged.     

事件驱动的工作流管理方法及执行引擎

随着经济的飞速发展,企业业务流程构成复杂、多变,而传统的工作流所建立的流程模型只能按照线性的路由执行,已不能满足现实需要。通过引入事件驱动机制,对事件进行建模,并采用事件的发布与订阅机制实现不同流程之间的事件关联,其后详细介绍了事件驱动的工作流系统实现原理。最后,采用工作流服务平台进行仿真和验证。     

基于嵌入式LINUX的异步事件驱动数据采集模型

提出了一种基于嵌入式Linux的高性能多路数据采集软件模型．该模型采用ACE设计模式提供的体系架构，实现了异步事件驱动的并发处理，能支持事件多路分离，异步操作结束会触发事件句柄，再调用回调函数完成相应的数据处理任务。由于对数据源事件的监测、数据读取、多事件的处理等操作是由操作系统完成．该模型可以有效避免多进程同步机制系统开销较大的问题，从而提高嵌入式系统的多路数据并发采集能力。     

基于SRL结构的抗辐射SRAM单元设计

在空间辐射环境中,单粒子翻转(SEU)效应严重影响了SRAM的可靠性,对航天设备的正常运行构成极大的威胁。提出了一种基于自恢复逻辑(SRL)结构的新型抗辐射SRAM单元,该单元的存储结构由3个Muller C单元和2个反相器构成,并采用读写线路分开设计。单粒子效应模拟实验结果表明,该单元不仅在静态存储状态下对SEU效应具有免疫能力,在读写过程中对SEU效应同样具有免疫能力。     

Adaptive admission/congestion control policies for CDMA‐based wireless internet

Radio resource management (RRM) is vital for the next generation wireless networks. RRM comprises many functionalities and this paper focuses on the investigation of the performance of several adaptive call admission/congestion control policies based on a window‐measurement estimation of the status of the buffer at the base station under the hybrid TDMA/CDMA access scheme. In our study, we interrelate the physical limitations of the base stations (i.e. the number of transmission and reception modems), call and burst level traffic, instantaneous buffer conditions and end‐to‐end bit error performance in one queuing problem. Subsequently, a window‐measurement estimator is implemented to estimate the likelihood of buffer congestion at the base station. Accordingly, the traffic loads shall be controlled. We use event‐driven simulation to simulate the multimedia integrated CDMA networks where heterogeneous traffic users are multiplexed into a simple TDMA frames. The simulation results show outstanding performance of the proposed call admission/congestion control policies in guaranteeing QoS requirements. Copyright © 2005 John Wiley & Sons, Ltd.     

利用移动交换中心直接播放彩铃的方法研究

彩铃业务自发展以来,由于其业务特点及当时的技术条件决定了其业务的提供方式,即通过在网络中引入专门提供彩铃业务的平台来开展彩铃业务。利用移动交换中心直接播放彩铃的方法,则不再需要另外发起一次指向彩铃平台的彩铃呼叫,不再需要在移动通信网内再建设彩铃呼叫平台,在节省大量系统建设成本的同时,彩铃接续中又减少了一次指向彩铃平台的彩铃呼叫,进而提升了移动通信网的运行效率。     

Modulation Bandwidth Enhancement in Optical Injection-Locked Semiconductor Ring Laser

The modulation bandwidth of a optical injection-locked (OIL) master–slave configuration using a semiconductor ring laser (SRL) as the slave laser is investigated. The modulation bandwidth depends on the detuning frequency, input optical power into the slave SRL, and the bias current to the SRL in the master–slave configuration. Modulation bandwidth of $> $40 GHz has been achieved when modulating the master laser, in contrast to the 15-GHz modulation bandwidth of the free-running SRL. The unidirectional operation of the SRL as a slave laser allows monolithic integration of such OIL scheme as it produces little feedback to the master laser.      

Domain‐Adaptation Technique for Semantic Role Labeling with Structural Learning

Semantic role labeling (SRL) is a task in natural‐language processing with the aim of detecting predicates in the text, choosing their correct senses, identifying their associated arguments, and predicting the semantic roles of the arguments. Developing a high‐performance SRL system for a domain requires manually annotated training data of large size in the same domain. However, such SRL training data of sufficient size is available only for a few domains. Constructing SRL training data for a new domain is very expensive. Therefore, domain adaptation in SRL can be regarded as an important problem. In this paper, we show that domain adaptation for SRL systems can achieve state‐of‐the‐art performance when based on structural learning and exploiting a prior model approach. We provide experimental results with three different target domains showing that our method is effective even if training data of small size is available for the target domains. According to experimentations, our proposed method outperforms those of other research works by about 2% to 5% in F‐score.     

Network management platform based on mobile agents

Many of the modern network management solutions are based on commercially available management platforms. These platforms offer common management services, such as support for multiple‐management protocols, alarm management, and event correlation. Most of these platforms are based on the traditional manager—agent model adopted in standard protocols, such as Internet SNMP. However, these platforms suffer from limitations imposed by the centralized, static, polling‐based management model of SNMP, and the need for maintaining a central intelligence at the platform level. In view of the dynamic nature of evolving networks, future network management solutions need to be flexible, adaptable, and intelligent without increasing the burden on network resources. We have addressed this requirement with a new management platform architecture based on ontology‐driven mobile agents. This paper presents the new management platform architecture, its prototype implementation, and the results of its evaluation. Copyright © 2004 John Wiley & Sons, Ltd.