A Per-Flow Based Node Architecture for Integrated Services Packet Networks

As the Internet transforms from the traditional best-effort service network into QoS-capable multi-service network, it is essential to have new architectural design and appropriate traffic control algorithms in place. This paper presents a network node architecture and several traffic management mechanisms that are capable of achieving QoS provisioning for the guaranteed service (GS), the controlled-load (CL) service, and the best-effort (BE) service for future integrated services networks. A key feature of our architecture is that it resolves the out-of-sequence problem associated with the traditional design. We also propose two novel packet discarding mechanisms called selective pushout (SP) and selective pushout plus (SP+). Simulation results show that, once admitted into the network, our architecture and traffic management algorithms provide, under all conditions, hard performance guarantees to GS flows and consistent (or soft) performance guarantees to CL flows, respectively; minimal negative impact to in-profile GS, CL and BE traffic should there be any out-of-profile behavior from some CL flows.     

十堰邮政客户服务中心解决方案

简述了邮政客户服务中心设计的总体原则和总体解决方案 ,以及客户服务中心的系统结构、系统构成和设备功能 ,着重介绍了业务系统的业务功能、话务座席功能和业务处理流程 ,对正在进行的客户服务中心建设具有一定的参考作用     

A model for rational abandonments from invisible queues

We propose a model for abandonments from a queue, due to excessive wait, assuming that waiting customers act rationally but without being able to observe the queue length. Customers are allowed to be heterogeneous in their preferences and consequent behavior. Our goal is to characterize customers' patience via more basic primitives, specifically waiting costs and service benefits: these two are optimally balanced by waiting customers, based on their individual cost parameters and anticipated waiting time. The waiting time distribution and patience profile then emerge as an equilibrium point of the system. The problem formulation is motivated by teleservices, prevalently telephone- and Internet-based. In such services, customers and servers are remote and queues are typically associated with the servers, hence queues are invisible to waiting customers. Our base model is the M/M/m queue, where it is shown that a unique equilibrium exists, in which rational abandonments can occur only upon arrival (zero or infinite patience for each customer). As such a behavior fails to capture the essence of abandonments, the base model is modified to account for unusual congestion or failure conditions. This indeed facilitates abandonments in finite time, leading to a nontrivial, customer dependent patience profile. Our analysis shows, quite surprisingly, that the equilibrium is unique in this case as well, and amenable to explicit calculation. This revised version was published online in June 2006 with corrections to the Cover Date.     

EVDO连接成功率研究和效果评估

本文结合本地网EVDO网络优化实践,围绕用户数过载、DO双裁插花、资源不足等可能影响EVDO连接成功率典型问题,通过相关问题的成功解决总结出EVDO连接成功率优化思路,对EVDO连接成功率优化具有一定参考价值和推广意义.     

Pricing currency derivatives with Markov-modulated Lévy dynamics

Using a Lévy process we generalize formulas in Bo et al. (2010) for the Esscher transform parameters for the log-normal distribution which ensure that the martingale condition holds for the discounted foreign exchange rate. Using these values of the parameters we find a risk-neural measure and provide new formulas for the distribution of jumps, the mean jump size, and the Poisson process intensity with respect to this measure. The formulas for a European call foreign exchange option are also derived. We apply these formulas to the case of the log-double exponential distribution of jumps. We provide numerical simulations for the European call foreign exchange option prices with different parameters.     

TD-LTE网络CSFB方案的优化研究

CSFB方案作为目前中国移动TD-LTE网络主流的语音解决方案,涉及2/3/4G网络多个网元,流程复杂、影响因素众多,本文首先对终端开机驻留、呼叫建立、挂机返回及时延异常等常见问题进行了梳理分析;然后详细阐述了CSFB呼叫时延、被叫成功率两大关键指标的优化措施,对于指导CSFB优化工作开展具有较好的参考价值。     

移动电话反克隆分析算法及其系统实现

通过对主叫号码的话单进行通话时长、通话次数、用户移动性和通话时间冲突等克隆特征匹配的扫描分析,识别出可疑的移动电话克隆用户。设计了不同被叫号码类型的通话累计时间和次数分析算法、用户移动速度分析算法和主叫通话时间冲突分析算法。以话单分析算法为核心实现移动电话反克隆分析处理系统。系统实际应用表明采用话单分析算法识别可疑克隆对象具有较高的准确性和可靠性,从而为运营商提供了一种更加灵活的反克隆技术手段。     

适合话音服务平台的结构化小文本搜索引擎的研究

在电信运营商的转型过程中,传统的114语音平台作为以用户需求为核心的信息服务平台逐渐引起了人们的重视,但传统的基于数据库的查询方式越来越不能满足现在的用户信息需求,语音平台的数据特点和服务特点也决定了基于语音平台的信息搜索和信息服务不同于互联网的信息搜索服务。本文根据话音平台信息服务的特点提出了服务话音平台的结构化小文本搜索引擎的设计思想,在充分考虑话音平台信息特点和服务特点的同时,从搜索算法和系统设计的角度设计了适合话音服务平台的结构化小文本搜索引擎。     

浅析DigitMap在拨号后时延及接通率的作用

在软交换中,号码图表（DigitMap）是驻留在媒体网关（MG,Media Gateway）内,为检测和上报终结点收到的Digit事件,使用户摘机时随拨号音一同下发给MG,并要求用户拨号时,MG用DigitMap来判断用户所拨的号码流是否有效,当检测到的号码串和其中某一列相匹配时就向媒体网关控制器（MGC,Media Gateway Controller）发出通知,利用该描述符MG就可以实现成组发码。通过DigitMap数据与传统NO.7信令的对比,优化DigitMap数据可以缩短用户的拨号后时延,提高接通率。     

基于降速的TD-SCDMA集群系统接纳控制算法研究

基于3G系统的时分同步码分多址(TD-SCDMA)集群通信系统,可以承载不同类型的集群多媒体业务,并能够为用户提供服务质量(QoS)保证。结合各种多媒体业务的特点和集群主叫用户的特征,在传统呼叫接纳控制(CAC)算法的基础上给出了一种基于降速的集群主叫用户CAC算法,通过传统算法与所给算法的仿真比较,验证了所给CAC算法的有效性。