基于软交换技术的Vo IP探讨

软交换是一种功能实体,为下一代网络(NGN)提供具有实时性要求的业务的呼叫控制和连接控制功能,是下一代网络呼叫与控制的核心。在介绍软交换技术的网络结构基础上,提出基于软交换技术的Vo IP网络结构,以及基于软交换技术的Vo IP网络相对于传统Vo IP网络在实际应用当中所具有的优势。     

支持多媒体业务的呼叫模型研究

多媒体业务是下一代网络最重要的特点之一,同时也对下一代网络的核心控制实体软交换提出了新的要求。本文介绍了呼叫模型的基本思想和概念,分析了现有的呼叫模型及其优缺点,进而针对多媒体呼叫的特殊要求,提出了一种基于分层结构的呼叫状态模型,并详细阐述了其结构和特点。     

下一代网络(NGN)核心技术之一——软交换

软交换是NGN的控制功能实体,为NGN提供具有实时性要求的业务的呼叫控制和连接控制功能,是NGN呼叫与控制的核心。软交换设备位于控制层,提供多种业务的连接控制、路由、网络资源管理、计费、认证等功能。软交换设备与各种媒体网关、终端、应用服务器、其它软交换设备间采用标准协议相互通信。软交换是网络演进以及下一代分组网络(NGN)核心技术之一,它独立于传送网络。     

固网运营商使用NGN软交换技术

随着互联网技术的发展,特别是基于互联网Voip技术不断的实践,各大运营商出于网络成本及新业务提供等各种不同目的,将NGN技术应用于电信级网络。NGN是基于IP分组技术,业务与呼叫完全分离,呼叫控制和承载完全分离,融合语音、数据、多媒体和移动业务的网络。本文结合营口网通软交换建设实践,主要对NGN架构进行了详细论述,并对固网运营商实现软交换后,业务能力的提升进行了阐述。     

固网运营商使用NGN软交换技术

随着互联网技术的发展,特别是基于互联网Voip技术不断的实践,各大运营商出于网络成本及新业务提供等各种不同目的,将NGN技术应用于电信级网络.NGN是基于IP分组技术,业务与呼叫完全分离,呼叫控制和承裁完全分离,融合语音、数据、多媒体和移动业务的网络.本文结合营口网通软交换建设实践,主要对NGN架构进行了详细论述,并对固网运营商实现软交换后,业务能力的提升进行了阐述.     

软交换上如何实现固网彩铃业务

随着软交换技术的发展,PSTN用户正逐步转变为软交换网络用户,以软交换网络为核心、PSTN端局作为接入的网络结构模式已形成。软交换网络通过基于IP传输的协议实现呼叫、业务控制和语音、数据的传输,将PSTN与数据网络结合起来,提供多种灵活丰富的业务。目前,如何与已有的PSTN端局网络有效互通,以实现业务的共享;同时兼顾业务的发展和网络的改造,提升网络的业务能力,正成为需要解决的问题,以下将介绍如何在软交换上实现固网彩铃业务。     

浅析软交换技术的应用

软交换技术的出现一方面造就了网络的融合,另一方面软交换采用了开放式应用程序接口（API）,方便了第三方应用的开发和新业务的引进。为满足用户对新业务的需求,网络中出现了公共的业务平台——智能网（IN）。智能网的设计思想就是把呼叫连接和业务提供分开,这种方法大大提高了增强业务的能力,缩短了新业务提供的时间。而这种分离仅仅是第一步,随着承载的多样化,必须将呼叫控制和承载连接进一步分离,这正是软交换引入的目的。     

通信工程中软交换技术应用探讨

通信及信息网络技术的发展,使通信与信息的专业界线越来越模糊,趋于融合。特别是计算机网络的普及和信息网络可靠性的提高,使得以软交换技术为核心的NGN网络应运而生。NGN也就是下一代网络,是集话音、数据、传真和视频业务于一体的全新网络。软交换技术是下一代网络核心技术之一,其特点是提供具有实时性要求的呼叫控制和连接控制。本文介绍了软交换网络的核心技术、网络架构和特点,并以此为基础。     

MMS业务平台中的软交换技术研究

目前MMS业务平台和软交换已经成为通信领域较为关注的两大热点。本文初步探讨了以软交换为核心的下一代网络对MMS业务平台的支持,提出了一种基于软交换的多媒体短消息（MMS）业务平台设计方案。     

业务控制网关功能(SCGF)实现模型研究

提出了业务控制网关功能的协议模型,讨论了PINT（PSTN／Internet Internet-working）协议与INAP（Intelligent Network Application Protocol）协议互相映像的3种设计方案。对ITU－T草案提出的IN（Intelligent Network）支持IP网络的增强型功能结构模型提出了改进方案－－取消独立的业务控制网关功能,在呼叫／承载网关中引入基本呼叫型提出了改进方案－－取消独立的业务控制网关功能,在呼叫／承载网关中引入基本呼叫状态模型,实现呼叫控制功能和业务交换功能,将呼叫／承载网关升级为SSP（Service Switching Point）,从而在呼叫／承载网关中集成业务控制网关功能。     

移动多媒体隐性服务要素组合优化研究

移动多媒体是一种以便携设备为载体的新型媒体服务,其所具有的移动服务能力使得用户可在多种不同情境下接受多媒体服务。但是,消费者在不同的情境下对隐性服务要素有不同的要求,这就要求供应商在服务设计中需依情境不同提供不同的移动多媒体隐性服务要素组合。本文采用联合分析方法探究客户对不同虚拟服务的偏好次序,分析移动多媒体各种隐性服务要素在不同服务情境下重要性权重的变化,进而给出不同控制变量组合下的最优隐性服务要素组合,分析结果可以帮助供应商科学地设计移动多媒体隐性服务要素组合并优化其营销策略。     

Mobile agent based approach for QoS routing

A mobile agent based on-demand quality of service (QoS) unicast routing scheme for supporting multimedia applications is proposed that considers bandwidth, delay and packet loss as QoS metrics for feasible path computation. A mobile agent is employed to find multiple QoS paths and select a best path among them to preserve resources so as to increase call success ratio and network bandwidth utilisation as well as adapt to network dynamics. The scheme is simulated in various network scenarios (sparse and dense networks) to verify performance and operation effectiveness, and compared with RSVP-based QoS routing by using an internet routing protocol. The results demonstrate significant improvements in call success ratio and network bandwidth utilisation compared with RSVP-based QoS routing, both in case of sparse and dense networks. Benefits of the agent-based scheme are adaptability, flexibility, and support for component-based software engineering features such as software reuse, customisation and maintainability     

宽带智能网中IN-SSM模型的研究

提出了一种新的ＩＮ－ＳＳＭ模型。它基于ＩＮ与Ｂ－ＩＳＤＮ综合方案,能有效地表示呼叫所使用的网络资源,同时也给Ｂ－ＳＣＦ提供一种视图,便于ＩＮ实现多方和多媒体业务。     

Factors affecting the behavioral intention to adopt mobile banking: An international comparison

Over the past decade, the markets for mobile and wireless services have been among the world's fastest-growing, especially in Asian countries, presenting financial institutions with significant opportunities to offer value-added services. Mobile banking has since emerged as a new channel enabling the banks to react strategically to changes in competitive forces and to enhance customer convenience.Based on Diffusion of Innovations (DOI) theory, the Technology Acceptance Model (TAM), the Decomposed Theory of Planned Behavior (DTPB) model, this study develops an integrated model to provide a fuller understanding of factors facilitating or impeding the adoption of mobile banking, focusing on consumers in Taiwan and Vietnam. While subjective norms had a significant effect on the intention to adopt, three attributes of mobile banking (compatibility, perceived usefulness, and perceived risk) were found to have indirect effects on intention to adopt mobile banking through attitude toward adoption for consumers in both Taiwan and Vietnam. Intention to adopt mobile banking was indirectly influenced by self-efficacy and facilitating conditions, and directly affected by perceived behavioral control in both nations. Some differences in intention to adopt mobile banking between Taiwanese and Vietnamese are also discussed. Based on the research findings, managerial implications for financial institutions and mobile service providers are discussed.     

Error recovery in video transmission over CDMA2000 broadcast networks

Multimedia services over a CDMA2000 broadcast network face a challenge from the unreliable and error-prone nature of the radio channel. Reed-Solomon (RS) coding, integrated with the MAC protocol, is used to cope with this problem. However, performance analysis of RS coding under varying channel conditions shows that it is not always effective, especially for slow-moving nodes which experience relatively long error bursts. Therefore a more efficient scheme is proposed that uses a RS code with reduced parity overhead, and freeing bandwidth can be used flexibly for retransmission. The packets to be retransmitted are prioritised by a utility function derived from the map of the error control block at each mobile node and the number of mobile nodes that require the lost packet. Simulation results show that the gain of retransmission exceeds the loss incurred by reducing the parity, leading to an improvement in the playback quality of MPEG-4 video streams. As a result, service area for high-quality multimedia can be expanded.     

移动智能网用户的通话时长模型分析

根据从移动运营商的移动智能网中采集到的真实数据,分析了"神州行"预付费业务用户通话时长的分布规律.分析结果表明,指数分布与样本数据的经验分布之间存在较大差异,不适合用来描述通话时长规律;经验分布可以用一个混合分布描述,它由两个单点分布和两个对数正态分布的加权和分布组成.类似的结论对于移动虚拟专用网(VPN)业务的通话时长也成立.它对移动智能网的性能分析具有重要意义.     

Location management for packet switched services in 3G partnership project networks

In order for third-generation partnership project (3GPP) networks to cope with the rapid growth of IP data traffic, the location management requires further enhancement to accommodate the burst data traffic characteristics of packet switched (PS) services. The universal mobile telecommunication system (UMTS) location management solutions for PS services in 3GPP networks has been investigated, and an inactivity counter mechanism in PS domain to reduce the location management cost of inactivate users has been proposed. An analytical model accommodating diverse call and mobility characteristics of user equipment to evaluate the performance of the inactivity counter mechanism has also been developed. Using the proposed model, the performance of the inactivity counter mechanism in UMTS terrestrial radio access network recommended by 3GPP is investigated, the cost reduction obtained by the proposed mechanism when compared with the original location strategy used in the PS domain is then analysed, which also shows the effect of system parameters and users' mobility and service patterns on the location management costs.     

用于软交换中协议适配的统一消息的设计与应用

分析了软交换的体系结构,提出了软交换中协议适配的方法,设计了一个适用于目前网络上存在的所有呼叫控制协议的统一消息集,并描述了消息的结构,讨论了统一消息与SIP和H.248协议之间的映射流程.以该方法为基础所实现的软交换具有较高的性能和可扩展性.     

一种新的基于软交换的业务提供方案

提出了一种新的基于软交换的业务提供框架,该框架可以同时提供对Parlay和传统SCP业务的支持。并在对现有的业务接口进行详细分析和比较的基础上,设计出一种适用于该框架的能力完善,易于升级的X接口。