携号转网管理政策体系研究

携号转网是移动电话用户变更签约的电信企业而用户号码保持不变的一项服务,目前已在全球近80个国家和地区实施。我国于2019年11月27日正式在全国提供携号转网服务。携号转网管理政策体系的建立确保了携号转网服务的有序提供,在保障用户合法权益、引导企业规范经营、提供监管政策依据方面发挥了重要作用。结合国际、国内政策分析,充分论证了我国出台携号转网管理政策的必要性和可行性,并对携号转网服务后续监管提出启动技术监测、丰富监管案例、建立通报机制、强化落地执行四方面建议。     

Modeling call control for distributed applications in telephony

The advanced intelligent network (AIN) architecture, an environment in which distribution applications are designed, developed, and deployed independent of the network implementation by different service developers, on possibly different platforms, at different times, is considered. The focus is primarily on support for call-processing applications through call-modeling techniques. However, the entities of NECs application service processor (ASP) architecture as a whole are briefly described to provide a basic understanding of the scope of the call model. The call-modeling concepts discussed at the Bellcore-sponsored Multi-Vendor Interaction forum are compared with NEC's call-modeling concepts. A simple approach (i.e. the logical path) for controlling the execution of FCs (function components) when multiple AIN services are active on a call is suggested. An object-oriented implementation based on the NEC call model is described     

移动网间号码携带集中数据库系统接口协议设计

主要介绍移动网间号码携带集中数据库系统接口协议的设计方法,包括接口协议的设计目标、可靠性保障机制以及承载的协议等内容。     

我国携号转网服务开展情况

2019年11月27日,在全国范围内正式提供携号转网服务。重点研究我国携号转网服务开展情况,对携号转网服务运行情况、影响因素、主要挑战及对电信行业带来的影响进行分析。     

携号转网服务推广引起的扰乱市场秩序行为预判及处置建议

在携号转网前期试验阶段,发现部分电信运营商存在因携号转网服务引发的扰乱市场秩序行为,这些行为大大降低了用户体验、影响了行业形象,理应在全国推广过程中加以重视并积极规制。梳理了推广过程中可能出现的几类扰乱市场秩序行为,根据不同类型的行为提出了针对性处置建议。     

真随机数发生器在信息安全系统中的应用

信息安全系统的安全核心是内置的随机数发生器。本文分析了常用的两类随机数发生器,指出了并非硬件随机数即为真随机数,提出了硬件真随机数发生器的实现原理和评测准则。本文网络版地址：http：//www. eepw.com.cn/article/274735.htm     

A study of mobile number portability effects in the United States

Drawing on a sample of 684 mobile subscribers in the US, this study investigates the effect of mobile number portability (MNP) by focusing on subscribers’ perceptions and behaviors on MNP. The FCC mandated number portability to wireless carriers for customer benefits through increased competition in the industry. Statistical analyses in this study reveal, however, subscribers perceive switching barrier is still high, discouraging subscribers from switching carriers. Carriers develop new subscriber lock-in strategies that make subscribers stay with current carriers. In addition, there are other hidden costs despite MNP that subscribers should burden with number portaling. In all, MNP is upheld by subscribers’ burden not carriers and not regulators, which partly explains the low number of switching subscribers under MNP. The findings imply that MNP has more directly affected the industries to a greater extent than subscribers, which suggests implications for both regulators and industries; how to effectively enforce MNP to achieve the intended goals and how to achieve competitive advantage with MNP.     

Efficient estimation of call blocking probabilities in cellularmobile telephony networks with customer retrials

A novel approximate technique is proposed for the estimation of call blocking probabilities in cellular mobile telephony networks where call blocking triggers customer retrials. The approximate analysis technique is based on Markovian models with state spaces whose cardinalities are proportional to the maximum number of calls that can be simultaneously in progress within cells. The accuracy of the approximate technique is assessed by comparison against results of detailed simulation experiments, results of a previously proposed Markovian analysis approach, and upper and lower bounds to the call blocking probability. Numerical results show that the proposed approximate technique is very accurate, in spite of the remarkably small state spaces of the Markovian models     

全国携号转网服务方案设计与政策研究

2019年政府工作报告提出“实现全国携号转网服务”。在实施携号转网过程中,现网改造、业务规则、行业监管等诸多方面都存在不同程度的挑战。首先,结合用户需求和行业规范,分别从业务交互和系统支撑两个层面提供了一整套服务实施方案,包括携号转网服务流程、发端查询机制等。其次,对携号转网政策进行了研究和分析,包括监管政策、携号转网用户画像、企业运营策略等,并提出优化建议。最后,对携号转网在未来通信市场发展趋势的影响进行了展望。目前,中国电信持续保持净携入,且携号转网投申诉率、系统故障率均保持行业最低,有关监管建议得到行业主管部门的初步采纳。     

Developing applications for Internet telephony: a case study on the use of parlay call control APIs in SIP networks

Applications offered to end users as value-added services, or more simple, services, are crucial for the survival and success of service providers. Two main sets of standards have emerged for Internet telephony: H.323 from the ITU-T and SIP from the IETF. Unfortunately, the related application development frameworks are rather weak. Parlay, a set of standard object-oriented and signaling protocol-neural APIs, is an alternative. It allows applications to access network functionality, including call control, in a controller manner. Call control makes it possible to establish, modify, and tear down calls. It is the main functionality offered by Internet telephony networks. We have built a call control application in a SIP environment, using the call control APIs offered by Parlay. The application is a multiparty game. This article describes the case study. The mapping of the APIs onto SIP is presented, and its implementation is described. Related work reviewed, and the lessons learned are discussed. Parlay call control APIs are suitable for application development in Internet telephony. However, well isolated extensions are needed to realize their full potential.     

基于DW的元数据驱动客服查号系统设计研究

构建了电信行业基于元数据驱动客服查号系统来实现多种增值业务，解决数据资料入库等待时间过长、呼叫来话高峰期数据库任务执行失败、整个系统的准确性和可靠性不高等问题。包括以元数据驱动工作流方式实现的数据预处理、拼音编码、完整性检查、一致性检查和入库的流程控制和回滚。     

Integrated call control in a CDMA cellular system

Soft handoff is an essential component of code-division multiple-access (CDMA) digital mobile communication systems. While soft handoff has some advantages of system capacity and communication quality, it also has some disadvantages arising from the excessive use of channel resources. In this study, we propose a new control policy to alleviate effectively this excessive use of channel resources. For CDMA cellular mobile systems consisting of homogeneous cells, a variety of traffic parameters are estimated by the detailed traffic analysis, based on which a Markovian queueing model is developed to analyze the performance of the proposed call control policy. With a well-known performance objective, a mathematical problem of finding optimal call control parameters is proposed, along with its solution method     

Spectrum-efficient call control in a dual-mode TDMA cellular system

This study deals with a call control strategy in a dual-mode time-division multiple access (TDMA) cellular system, which provides services both to analog and digital calls. Since analog calls consume the frequency resource several times as much as digital calls, we consider a call control strategy of the threshold type that the number of active analog calls is restricted within a prespecified level. Given the arrival rates and the grade of service (GOS) for both types of calls in the cells, two nonlinear integer optimization problems are considered for a multicell system as well as for a single cell system. One problem is to find the threshold parameters for optimizing the relevant objective measures. The other is to obtain the minimum numbers of required channels in the cells satisfying the GOS of both types of calls. The solution methods for the two kinds of optimization problems are devised based on the properties of the objective function and the blocking probabilities of both call types. The efficiency of the proposed algorithms is verified by extensive computational experiments with realistic input data     

Analysis of a polling system for telephony traffic with application to wireless LANs

Recently, polling has been included as a resource sharing mechanism in the medium access control (MAC) protocol of several communication systems, such as the IEEE 802.11 wireless local area network, primarily to support real-time traffic. Furthermore, to allow these communication systems to support multimedia traffic, the polling scheme often coexists with other MAC schemes such as random access. Motivated by these systems, we develop a model for a polling system with vacations, where the vacations represent the time periods in which the resource sharing mechanism used is a non-polling mode. The real-time traffic served by the polling mode in our study is telephony. We use an on-off Markov modulated fluid (MMF) model to characterize telephony sources. Our analytical study and a counterpart validating simulation study show the following. Since voice codec rates are much smaller than link transmission rates, the queueing delay that arises from waiting for a poll dominates the total delay experienced by a voice packet. To keep delays low, the number of telephone calls that can be admitted must be chosen carefully according to delay tolerance, loss tolerance, codec rates, protocol overheads and the amount of bandwidth allocated to the polling mode. The effect of statistical multiplexing gain obtained by exploiting the on-off characteristics of telephony traffic is more noticeable when the impact of polling overhead is small.     

Analysis of the influencing factors of users' switching intention in the context of one-way mobile number portability

This paper reviews the implementation of mobile number portability (MNP) in other countries except China. The authors tested the influencing factors of users' switching intention in the context of the one-way MNP policy survey data from 400 China Mobile users in Tianjin (pilot city). The study briefly describes the implementation of one-way MNP, particularly the “lag system” MNP and its implementation effect in Korea, with which country China has an analogy under the MNP policy. The current paper seeks to provide a reasonable referential direction for the further development of government regulation under the MNP policy.Then, a research model is developed based on users' actual behavior in the pilot city. The results of this research show that customer satisfaction (including call quality, mobile device and customer complement), switching costs and attractiveness of alternatives have significant effects on users' switching intention. Among these factors, customer satisfaction and switching costs are the most important to China mobile users. In comparison, the attractiveness of alternatives (China Telecom, China Unicom) is not a considerable factor of switching intention to China mobile users, in the context of one-way MNP. We conclude with a discussion of the contributions and limitations of this study.     

基于H.323协议的IP电话网络合法侦听体系

针对近年来IP网络电话业务的大量涌现，简要介绍了IP网络电话合法侦听的概念，分析了与传统PSTN相比，对IP电话实施侦听的难点所在；接着设计给出了适用于H．323网络的、符合ETSI规范的合法侦听体系，并对比其他侦听体系分析了其优点所在。     

银行排队叫号系统设计

随着当今时代科技的发展,科技在各个行业受到广泛运用。文章设计了一种银行排队叫号系统,该系统基于AT89C52的嵌入式系统而设计,用户通过该排队系统进行业务办理等待,其主要核心是通过系统进行安排排队抽号顺序,用户在排队机前进行抽号,系统会生成排队号码并反馈给用户和工作人员,工作人员利用该系统进行叫号并且通过显示器提醒用户当前所叫号数,用户可以通过该系统随时了解排队情况。该系统的运用,可以极大地提高银行排队等待的效率,可以通过排队自动化、规范化来解决客户排队的混乱秩序,同时通过这种现代化信息处理,提高银行的服务水平和质量。     

The call control protocol in a separated call and bearer environment

The separation of call and bearer to support future teleservices and services in broadband networks is outlined in this paper. Various mechanisms to undertake the separation are overviewed and the method chosen by the International Telecommunications Union (ITU) and the European Telecommunications Standards Institute (ETSI) is described in detail. A full protocol model for broadband access signalling is derived and explained from the basic steps leading through to the establishment of an association between end-points supporting call control information flows. The call control protocol, currently being developed to establish, maintain and clear a call with more than one connection, is outlined and illustrated by information flows.     

Performance analysis of several call launching schemes in an outbound call management system

An outbound call management (OCM) system is used in launching calls to customers in a company or service center for the purpose or application of, for example, bill processing. Preliminary study of OCM systems has been done in a few prior studies. This paper conducts performance analysis of several new call launching schemes for an OCM system. An empirical scheme is first proposed and analyzed. The empirical scheme has the advantage of easy implementation. This paper continues to examine the performance of an optimal launching scheme via the technique of linear programming. To reduce the complexity, a suboptimal scheme is next proposed and analyzed. Through numerical examples, the empirical scheme is shown to perform only slightly worse than the optimal scheme, but better than the suboptimal scheme.The work reported in this paper is supported by the National Science Council of the Republic of China under Grant NSC81-0404-E002-010(1992).