基于运营收入最大化的Parlay网关过载控制

针对目前基于节点过载算法不灵活、响应时间长的问题,结合下一代网络中 Parlay 网关过载控制的新的需求,设计了基于网络的、运营收入最大化的 Parlay 网关过载控制的模型。并将基于 agent 的线性规划理论引入到过载控制算法中,提出了基于 agent 线性规划理论的过载控制系统结构。实验表明,采用此方法,可以很快找出满足运营收入最大化的过载控制算法,且在大型软交换网络中具有良好的可伸缩性,可缩短过载控制的响应时间,提高控制灵敏度,且可灵活地按照地域等因素划分子网。     

Parlay技术中负荷控制机制研究

研究作为下一代业务提供技术的Parlay技术中涉及的负荷控制机制.本文构建的Parlay体系分为三个层次组成:实现协议映射的TC-CORBA关口、提供Parlay API(Application Programming Interface)的呼叫控制能力服务器、提供业务逻辑运行环境的应用服务器.本文在这些层次展开对负荷控制机制的研究.     

自适应负荷平衡的Parlay业务集群研究

负荷平衡是Parlay业务在下一代网络中进行电信级应用的关键技术之一,研究该技术对以业务为驱动的下一代网络的成功实施具有重要意义.研究了下一代网络中Parlay业务的一种自适应负荷平衡集群拓扑结构,分析了Parlay业务在负荷自适应平衡时采用无状态方法和有状态方法在操作序列上的差异,提出一种负荷平衡自适应算法.     

The Application of WSFL in the Parlay X Based Services Creation

1　Introduction　NGN abstracts beneath protocols as a set of easy under standing interfaces through open Application ProgrammingInterfaces (API). These APIs are independent with net works, so the services created with these APIs are irrespec tive to special network details[1]　ParlayXAPI is a set of more single and higher abstractedAPIs than Parlay API. These ParlayXAPIs have the abilityto access the network functions, and are easy to understandby IT developers to use in …     

Opening up networks with JAIN Parlay

The desire for new business growth has been a major driving force towards the development of open network APIs, such as the Parlay API, within telecommunications networks. The Parlay API enables both third parties (external companies, operating outside the security domain of the network operator) and network operators to build new applications that rely on real-time control of network resources. The Java APIs for integrated networks (JAIN^TM) Community is defining a Java version of the Parlay API to bring the benefits of the Java language to the Parlay API, and to promote industry-wide adoption of the Parlay API. This article describes the background and rationale behind the work of the Parlay Group, together with the characteristics, structure, and capabilities of the Parlay API. The benefits that Java and the JAIN Community bring to the Parlay API are then explored. A technical overview of the Java version of the Parlay API, referred to as the JAIN Parlay Edit Group API, is given and illustrated using example sequence diagrams. The article concludes by taking a look at what additional features may be added to the API and the implementation activities that lay ahead     

一种改进Parlay API增强呼叫等待保持能力的方法

通过对呼叫等待业务实例的深入分析得出Parlay API4．0规范缺乏呼叫等待保持能力，提出了一种修订终端呼叫腿状态机和增加功能接口的方法，该方法可以在保持Parlay API后向兼容性和不改变呼叫控制模型的同时增强呼叫等待保持能力，最后给出一个基于改进了的Parlay API的呼叫等待业务实例流程。     

稳定服务质量水平的动态路由算法

本文介绍判定服务质量状态的质量水平涨落函数,以及与用户需求和服务资源变化相适 应的动态质量路由算法。仿真实验表明该算法具有稳定服务质量、平衡网络负载等特点。     

Web服务及其在Parlay接口中的应用

电信网与Internet走向融合，而Parlay接口与Web服务作为各自领域开放技术的代表，也开始了互相结合。Web服务是一种基于可扩展标记语言（XML）、面向消息的分布式计算技术，与公共对象请求代理体系结构（CORBA）等分布式对象技术相比，在Internet范围内的互操作性更好。Web服务是实现面向服务体系结构（SOA）的最佳候选技术之一。基于Web服务的Parlay接口包括Parlay Web服务和Parlay X。其中，Parlay Web服务模拟面向对象的Parlay应用编程接口（API）定义，Parlay X的设计遵循Web服务面向消息的技术发展思路。基于Web服务的Parlay接口技术为构建电信网和Internet融合环境下的统一业务体系提供了基础。     

Parlay/OSA技术研究

Parlay/OSA是Parlay工作组制定的一套开放的、技术独立的应用编程接口,它向业务开发者屏蔽底层网络,实现业务快速接入。介绍了Parlay/OSA技术的产生和应用背景,以及技术总体概述。详细描述了Parlay/OSA的体系结构,包括框架组成和各部分功能详述。以号码翻译和多方呼叫为例,举例说明了Parlay/OSA的具体实现和应用,使读者能够更好地理解Parlay/OSA技术。     

Design,implementation and performance evaluation of a proactive overload control mechanism for networks of SIP servers

The extent and diversity of systems, provided by IP networks, have made various technologies approach integrating different types of access networks and convert to the next generation network (NGN). The session initiation protocol (SIP) with respect to facilities such as being in text form, end-to-end connection, independence from the type of transmitted data, and support various forms of transmission, is an appropriate choice for signalling protocol in order to make connection between two IP network users. These advantages have made SIP be considered as a signalling protocol in IP multimedia subsystem (IMS), a proposed signalling platform for NGNs. Despite having all these advantages, SIP protocol lacks appropriate mechanism for addressing overload causing serious problems for SIP servers. SIP overload occurs when a SIP server does not have enough resources to process messages. The fact is that the performance of SIP servers is largely degraded during overload periods because of the retransmission mechanism of SIP. In this paper, we propose an advanced mechanism, which is an improved method of the windows based overload control in RFC 6357. In the windows based overload control method, the window is used to limit the amount of message generated by SIP proxy server. A distributed adaptive window-based overload control algorithm, which does not use explicit feedback from the downstream server, is proposed. The number of confirmation messages is used as a measure of the downstream server load. Thus, the proposed algorithm does not impose any additional complexity or processing on the downstream server, which is overloaded, making it a robust approach. Our proposed algorithm is developed and implemented based on an open source proxy. The results of evaluation show that proposed method could maintain the throughput close to the theoretical throughput, practically and fairly. As we know, this is the only SIP overload control mechanism, which is implemented on a real platform without using explicit feedback.     

基于分层自治域空间信息网络模型与拓扑控制算法

针对空间信息网络结构复杂、拓扑动态变化以及空间尺度大等特点,提出一种面向空间信息网的分层自治域模型。该模型根据节点属性、链路能力、任务特点、分布区域等不同,将整个网络划分为不同的自治域和子自治域,各域内可采用相对独立的控制策略,从而将子网间各动态因素解耦合。然后,基于该分层自治域模型,提出了一种最小化时延的拓扑控制算法。与现有的集中式和分布式拓扑控制方法不同,该算法采用混合式方法,将控制信息约束在相邻子自治域范围内,既保证了网络的连通性,又减少了控制信息的开销。理论分析表明,若网络的物理拓扑是k连通的,则该算法得到的拓扑控制结果一定是k连通的。仿真结果验证了理论分析和所提出算法的有效性。     

基于lN平台的OSA/Parlay网关的实现

本文在对IN和OSA/Parlay体系结构进行深入研究的基础上,分析了IN和OSA/Parlay在网络功能上的相似性,提出了用IN平台实现Parlay网关的新思路,即用SIB编写业务逻辑程序的方法实现标准的Parlay接口类,为IN平稳过渡到Parlay开放架构提供了参考,并研究了业务逻辑程序和接口类的对应关系.然后本文以两个典型的应用为例,阐述了业务逻辑程序的启动、服务以及实例销毁的全过程.     

智能网开放业务接口的研究

阐述了在新的形势下开放智能网业务接口的必要性以及智能网开放技术的现状和目前存在的局限性,提出了智能网开放业务接口的技术解决方案.该解决方案在Parlay架构的基础上提出了构建Parlay X网关,并阐述了此网关的系统结构、功能实体以及各功能实体与智能网的关系;同时还阐述了Parlay X网关为应用服务器提供的Parl ay X接口封装以及网关通过Parlay X到底层协议的映射实现对底层网络的操作,由此进一步阐明了该解决方案.     

一种适用于下一代网络中应用服务器的过载控制算法

本文介绍了下一代网络中应用服务器的概念及其过载控制问题,分析了对过载控制新的要求,提出了应用服务器过载控制框架.在此基础上,给出了算法指标、过载检测方法和过载控制算法.理论分析和仿真结果表明本文提出的过载控制算法具有良好的有效性和公平性.     

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.     

一种IMS网络中过载保护控制方法

移动通信网络必须保证可靠性和稳定性,过载保护方法是通信网络保证其可靠和稳定的基础。分析第4代移动通信网络IP多媒体网络子系统（IMS）中过载保护的方法,并基于IP多媒体业务的理论基础,提出一种基于业务的多参数控制过载保护方法。对各种场景进行了细致分析,仿真结果表明,此方法能更好的控制对用户的过载,并对现有的业务流程和逻辑流程不产生任何影响,多参数控制情况下,还有利于系统在后台进行调整。     

Applying control theoretic approach to mitigate SIP overload

The Session Initiation Protocol (SIP) retransmission mechanism is designed to maintain reliable transmission over lossy or faulty network conditions. However, the retransmission can amplify the traffic overload faced by the SIP servers. In this paper, by modeling the interaction between an overloaded downstream server and its upstream server as a feedback control system, we propose two Proportional-Integral (PI) control algorithms to mitigate the overload by regulating the retransmission rate in the upstream server. We provide the design guidelines for both overload control algorithms to ensure the system stability. Our OPNET^® simulation results demonstrate that: (1) without the control algorithm applied, the overload at a downstream server may propagate to its upstream servers and cause widespread network failure; (2) in case of short-term overload, both proposed feedback control solutions can mitigate the overload effectively without rejecting calls or reducing resource utilization, thus avoiding the disadvantages of existing overload control solutions for SIP networks.     

基于Parlay X的下一代电信增值业务模型研究

Parlay X是一套简单易懂、比之Parlay在更高层次抽象电信网络基本功能的应用编程接口(API),它以Web Service的形式供IT应用开发者在开发的应用中调用电信网络功能.下一代网络业务的发展是一个渐进过程,对运营商来说,如何以更小的成本快速开发和部署新业务成了当务之急.文中介绍了Parlay X体系结构模型,着重提出了基于Parlay X的电信增值业务过渡模型,并对短信业务的开发流程进行了分析.     

基于Parlay X Web Service开发多方多媒体会议业务的研究

本文首先概述了Parlay X Web Service的概念及其优点,接着详细介绍了按照Parlay X Web Sewice2.0规范开发多方多媒体会议的方案,最后分析了在会议中增加语音交互能力时需要解决的技术问题,并给出了解决方法.     

The Parlay API — Allowing Third Party Application Providers Safe and Secure Access to Network Capabilities

This paper sets out to explain the concepts behind the development of the Parlay API. The paper firstly describes the historical origins of the development, showing where the concepts initially began and describing some early work undertaken by the TINA Consortium on distributed software environments. The paper then goes on to describe the architecture upon which the Parlay API is built, to analyse the constituent parts of the API, particularly the call control element, and to give an overview of the ideas behind what has become known as Parlay X. This revised version was published online in July 2006 with corrections to the Cover Date.