NGN多层三维立体QoS指标体系的研究

本文分析了当前NGN QoS指标体系研究中的一些不足．针对NGN的业务和网络特点．提出了一种多维、多层的立体QoS指标体系架构．并对每维．每层的功能、参数定义和指标分配进行了深入的探讨。最后,提出了各层指标描叙之间的参数映射的思想及一些初步的方法。     

NGN IP承载网QoS方案设计

分析NGN业务网对NGN承载网的需求，在充分论述和理解IP QoS衡量指标和IP QoS技术体系的基础上．提出NGN IP承载网Qos方案设计的方法。认为设计NGN承载网的QoS方案是一件复杂的工作，需要设计人员充分理解各种IP QoS技术，平衡各种IP Qos技术的优劣，在摸清NGN业务网络需求的基础上，针对每一种业务需求进行细致的设计。     

下一代网络中QoS的研究

对于下一代网络（NGN），如何保证端到端的服务质量（QoS）是NGN的核心问题之一。文章先介绍了NGN的内涵和体系结构，阐明NGN中QoS问题，然后着重介绍QoS的框架模型和几种实现QoS的关键技术，最后提出了对于NGN QoS研究的建议。     

浅析长庆NGN承载网QoS解决方案

为优化使用和管理网络资源,本文提出了核心承载网和宽带接入网的几种QoS解决手段.并通过在骨干层、汇聚层、接入层三个不同网络层面采取的不同技术手段实现NGN承栽网QoS策略保证,最后通过在业务接入侧、网络核心侧的QoS策略实现网络业务服务质量保证.     

下一代网络若干问题的再思考

本文对NGN若干问题进行了进一步思考和分析，其中包括网络模型、编址、QoS、综合接入网和驻地网业务层，并提出了发展思路。     

NGN和UMTS网络间的QoS参数映射

UMTS是3G无线网络的主要标准之一;NGN是一个用于定义和部署网络的概念。他们各自有着自己比较完善的QoS机制,但是两者结合起来却不能很好地为移动用户提供有QoS保证的服务。为了解决这一问题,文中分别介绍了UMTS和NGN网络中的QoS体制。在此基础上提出了一种新的网络架构,并结合具体场景详细阐明了该架构的工作原理以及所采用的QoS参数映射算法。     

NGN的QoS机制多媒体服务QoS保障

QoS(服务质量)是下一代网络(NGN)的关键技术之一。本文从NGN的QoS保障机制出发首先介绍了国际电信联盟(ITU)的有关标准草案。随后介绍了目前QoS研究的一些成果，并讨论了它们的应用前景和可能存在的问题。最后。文章介绍了四川联通NGN试验网“新纪网”多媒体业务的QoS保障方法。     

NGN面临的关键技术挑战--QoS

随着网络融合和电信业务IP化的趋势,特别是NGN的发展和不断成熟,NGN QoS正在成为人们关注的焦点.本文从NGN QoS的目标入手,对NGN QoS的关键技术和发展趋势进行了深入的分析.     

下一代网络中的QoS研究

对于下一代网络(NGN),如何保障端到端的服务质量(QoS)是NGN的核心问题之一,直接影响着NGN业务的提供.该文给出了NGN的网络体系结构和业务特点,针对其对服务质量的要求,探讨了在NGN中实现QoS的框架模型,着重介绍了几种实现端到端QoS保障的关键技术,分析了它们各自的特点和存在的问题.     

NGN网络中的资源控制技术研究

NGN（下一代网络）是以基于IP的分组交换为核心的网络,QoS（服务质量）性能至关重要。NGN通过引入控制机制、加强控制功能来为网络提供严格的QoS保证。文中分析和论述了NGN的QoS控制技术和策略,并基于ITU-T标准,对下一代网络QoS控制策略和实施方式的思路、优缺点及可行性进行了分析和比较。     

基于信任管理系统的可信路由器的设计与实现(英文)

This paper presents a scheme to perform QoS management and assure network security by using the trusted-router based on the Trust Management System.In this trusted-router,every IP packet is forwarded and queued by its trust value,which is the quantification of the network's expectation for this packet's and its owner's behavior in the network.We outline the algorithms to calculate the trust value of the trusted-router and the IP packet.We also introduce the trust-based QoS management algorithm and the deplo...     

3GPP系统架构演进(SAE)中的QoS探讨

针对不同的接入网技术和越来越高的用户需求,在SAE中实现端到端QoS显得尤为重要.本文详细介绍了SAE中引入的增强型QoS、QoS参数设置、用户数据承载级的区分控制和SAE中QoS协商过程,并分析了SAE中实现QoS有待解决的问题.     

针对弱硬实时系统的DRM调度算法

本文在定义支持多级QoS的弱硬实时系统周期任务模型的基础上,提出基于RM调度策略的弱硬实时调度算法DRM,它具备可调度判定不等式,不限定任务的QoS参数模式,并通过在调度的过程中动态调整任务的优先级来反映其紧迫程度.在系统过载时,DRM调度算法可以采用QoS退化机制,在保证紧要任务以及其所要求的最低QoS执行的同时,适当降低某些任务的服务等级,使得更多的任务可以有效运行,以此来提高系统对负载的适应性.最后,本文通过仿真实验,验证了DRM以及QoS退化机制的有效性.     

An Ant Colony Optimization Approach to a Grid Workflow Scheduling Problem With Various QoS Requirements

Grid computing is increasingly considered as a promising next-generation computational platform that supports wide-area parallel and distributed computing. In grid environments, applications are always regarded as workflows. The problem of scheduling workflows in terms of certain quality of service (QoS) requirements is challenging and it significantly influences the performance of grids. By now, there have been some algorithms for grid workflow scheduling, but most of them can only tackle the problems with a single QoS parameter or with small-scale workflows. In this frame, this paper aims at proposing an ant colony optimization (ACO) algorithm to schedule large-scale workflows with various QoS parameters. This algorithm enables users to specify their QoS preferences as well as define the minimum QoS thresholds for a certain application. The objective of this algorithm is to find a solution that meets all QoS constraints and optimizes the user-preferred QoS parameter. Based on the characteristics of workflow scheduling, we design seven new heuristics for the ACO approach and propose an adaptive scheme that allows artificial ants to select heuristics based on pheromone values. Experiments are done in ten workflow applications with at most 120 tasks, and the results demonstrate the effectiveness of the proposed algorithm.     

WiMAX系统QoS机制研究

重点介绍了IEEE 802.16-2004标准中为实现QoS所定义的各种机制，对MAC层协议中的Qos管理信令进行了分析，提出了对WiMAX的QoS功能进行增强的相关技术以及专门针对802.16的跨层Qos管理架构。     

Service-aware based fuzzy admission control scheme in multi-service networks

Multi-service aggregated transmission is the direction of IP network. Providing different Quality of Service (QoS) assurance for different services has become a crucial problem in future network. Admission control is a vital function for multi-service IP network. This paper proposes a novel fuzzy admission control scheme based on coarse granularity service-aware technique. Different service has discriminative sensitivity to the same QoS characteristic parameter in general. The traffic class can be perceived by the service request parameter and the proposed QoS function. And requirements of dif- ferent applications can be met by maintaining the life parameter. From simulation results, the proposed scheme shows a better QoS provisioning than those traditional fuzzy logic based methods under the same admission probability.     

A QoS Aware Dynamic Scheduling Scheme Using Fuzzy Inference System for IEEE 802.16 Networks

Providing quality of service (QoS) for diverse multimedia services is an important issue in IEEE 802.16 (WiMAX) networks. A scheduling mechanism that satisfies the QoS requirements has become more important for multimedia networks. In addition, scheduling algorithms for wireless networks are much more complex than that of wired networks because of channel quality variations and radio resource limits. This paper introduces a QoS Aware Scheduling System, based on fuzzy logic, for traffic management in WiMAX point-to-multi-point (PMP) networks. The proposed method attempts to guarantee delay and throughput QoS criteria. It considers QoS criteria and radio quality of each user in decision making processes. A series of simulation experiments have been carried out to evaluate the performance of the proposed scheduling system. The results show that the proposed method performs effectively to achieve QoS criteria and attains significant system performance for different types of traffic.     

Adaptive QoS parameters approach to modeling Internet performance

Due to the recent advances in Internet technologies and applications, the issue of Quality of Service (QoS) is more essential to Internet performance. In this paper, we address and discuss the influence factors and also finalize the QoS parameters for Internet performance. Then we present the simulation procedure for monitoring the performance evaluation and propose the algorithm for tuning the performance value. Based on simulation results and performance analysis, we can tune and adjust possible parameters' values and then refine the influence level of each QoS parameter. Finally, Internet performance can be enhanced and maintained through using the proposed approach over several sub‐networks. Hence, it increases the adaptability for implementing the QoS Internet. Copyright © 2002 John Wiley & Sons, Ltd.     

IEEE802.16中一种改进的跨层QoS调度架构设计

IEEE802委员会制定了一个解决“最后一公里”宽带无线城域网（WMAN）接入问题的全球统一标准,即IEEE802．16标准。它定义了支持多种业务类型的独立于具体物理层的MAC层和多个物理层。对于802．16系统的QoS保障,标准中详细规定了服务类别的划分以及系统的Qos框架和具体的信令交互机制,但没有规定具体的QoS调度算法,而是留给厂家设计。因此本文在IEEE802．16已有QoS调度架构的基础上,设计出一种改进的跨层QoS调度架构,并详细介绍了该构架下各功能模块的功能和具体实现方法。     

Agent Driven Delay and Power Constrained Multicast Routing in Mobile Ad Hoc Networks by Using ANFIS

Group communication applications in Mobile Ad hoc NETworks (MANETs) require stringent bounds on Quality of Service (QoS) parameters. In this paper, we propose an agent driven QoS mesh based multicast routing scheme in MANET that satisfies the user requirements with good reasoning by using adaptive neuro-fuzzy inference system (ANFIS). Four types of agents are used in the scheme: Multicast administer, ANFIS, Route inventing and Guard agents. The proposed scheme operates in following steps. (1) ANFIS agent at the source node optimizes membership functions of QoS parameters according to the user QoS requirement. It also computes QoS factor for different combinations of parameter values from optimized membership functions. (2) Route inventing mobile agent carries the QoS requirement, set of parameter values and their corresponding QoS factors to reach multicast receivers through intermediate nodes by using selective flooding and agent cloning. Multicast administer agent (MAA) at the intermediate node decides its QoS satisfiability. (3) Route inventing mobile agents trace back the traversed path by marking QoS nodes. They facilitate MAA at the source node to construct QoS mesh between source and destinations. (4) MAA at the source node selects a shortest path to reach each of the multicast receivers from the constructed QoS mesh, and (5) Guard mobile agent is employed for the link/node failures and management of the group. Our proposed scheme performs better than fuzzy based, and autonomic QoS multicast routing schemes.