宽带网中基于模糊代价的QoS路由选择

提出了模糊路由选择（ＱｏＳ－ＦＲ）模型,定义一组隶属函数来反映对某个度量值的ＱｏＳ要求,基于模糊规则推理出每条路径的模糊代价。Ｑｏｓ－ＦＲ在全网范围内均衡负载,从而减小了链路上拥塞的概率。仿真结果表明,在保证ＱｏＳ前提下,该方法可获得更高的链路利用率和更大的吞吐量。     

一个快速的时延有界低代价多播路由算法

基于ＱｏＳ的多播路由算法需要在满足每个个体ＱｏＳ需求的同时,又能高效管理网络资源,提出了一种满足端端时延限制的低代价多播路由算法。算法使用一个修改的Ｓｔｅｉｎｅｒ树近似算法先构建时延有界的低代价多播树,再通过最小时延路径与其它尚不在多播树的且结点相连。     

从网络管理到服务质量（QoS）管理

随着用户对多媒体应用需求的增加，网络负载将急剧增加。如何对网络资源进行综合管理与合理使用是一个急待解决的问题。本文在介绍ＯＳＩ网络管理的基础上重点描述了ＱｏＳ（ＱｕａｌｉｔｙｏｆＳｅｒｖｉｃｅ）的定义和管理，分析了网络管理和ＱｏＳ管理之间的关系。最后给出了一个结合网络管理进行ＱｏＳ管理的初步方案。     

基于QoS需求类型的资源动态分配算法

给出一个基于ＱｏＳ需求类型的资源动态分配算法，讨论了与算法相关的几个主要问题，算法的目的在于充分利用网络资源，同时避免ＲＳＶＰ、优先权、差分服务等机制带来的高ＱｏＳ要求业务对低ＱｏＳ要求业务的排挤的目的。还讨论了该算法在网络节点中的应用。     

操作系统对QoS的技术支持

该文就操作系统对ＱｏＳ（服务质量）的技术支持进行了深入探讨．在给出ＱｏＳ及其处理模型的基础上,阐述了ＯＳ支持ＱｏＳ的思想,并给出ＯＳ支持ＱｏＳ的技术实现方法．     

一种基于QoS的多维资源近似最优分配算法

分布式多媒体应用需要同时使用多种系统资源来保证用户的ＱｏＳ要求,如何在竞争资源的应用之间合理分配资源,使得在满足用户ＱｏＳ要求的基础上资源的利用率最高成为一个急需解决的问题,针对分布式多媒体应用的特性提出了一种基于ＱｏＳ的多维资源近似最优分配方法,该方法能显著地降低资源最优分配问题中的计算复杂度,并获得近似最优的资源分配方案。     

Windows系统网络QoS分析

简要介绍了当前网络服务质量的热点之一,ＲＳＶＰ协议和使用ＲＳＶＰ协议和使用ＲＳＶＰ协议的应用接口,ＧＱｏＳ,说明了如何使用Ｗｉｎｓｏｃｋ２ＧＱｏｓＡＦＩ来写请求ＱｏＳ的应用程序。着重阐述了一些与ＱｏＳ有关的ＡＰＩ的使用方法。并介绍一个使用ＧＱｏＳ编写的测试程序和利用这个测试程序对ＲＳＶＰ协议所做的一次测试。     

VPRN的QoS路由

ＱｏＳ是用户对ＶＰＮ的基本要求,在ＶＰＲＮ中,除了能用通常的ＱｏＳ路由方法实现ＱｏＳ外,还可以根据ＶＰＲＮ的特点优化资源,并可通过流量监测来适时调整路由以进一步优化资源。     

可视电话系统的QoS管理

ＱｏＳ管理近年来引起了人们的关注,尤其是分布式多媒体系统中ＱｏＳ管理更是一研究热点,本文则独辟蹊径,探讨点到点可视电话系统中的端到端的ＱｏＳ管理,以填补当前研究中的一个空白,本文给出了可视电话系统中的ＱｏＳ参考模型,管理策略以及可视电话系统的结构。     

一种基于计费管理的网络服务质量控制法

计费管理不仅是商业化的网络体系进行收支核算的工具,也是提高网络服务质量（ＱＯＳ）的途径之一。文章提出了一种基于多媒体网络服务质量（ＱＯＳ）控制的计费管理方法,即基于带宽的分时制计费方法（ＰＰＢＴ）。目的是运用计费管理手段,控制和提高多媒体用户的服务质量（ＱｏＳ）,进而达到最佳的网络资源利用率。     

Quality-of-service routing in IP networks

Multimedia applications such as video-conferencing, telemedicine, HDTV, etc. have very stringent quality-of-service (QoS) demands and require a connection-oriented service. For these applications, a path satisfying their requirements in terms of bandwidth, delay buffer, etc. needs to be found. As conventional IP routing is based only on hop counts, it is not suitable for multimedia applications. It is clear that, to route requests that have QoS requirements, existing routers should be made QoS aware and the packet forwarding should be based on QoS parameters. Also, routing protocols like OSPF and RIP must be extended suitably to facilitate QoS routing. The goal of QoS routing algorithms is to find a loop-less path satisfying a given set of constraints on parameters like bandwidth, delay, etc. The path selection process could return either the entire path to the destination or the best next hop for the request. The first case is called “source routing” and the second is referred to as “distributed routing”. In this paper, we propose a new distributed QoS routing algorithm for unicast flows, which has a very low call establishment overhead. Our algorithm makes use of existing IP routing protocols such as OSPF and RIP with minimal modifications     

基于QoS的无线传感器网络路由

综合考虑无线传感器网络的路径节点最小能量、路径能耗、延迟、信道错误率等因素,采用QoS路由对不同的查询业务实现区分服务。通过对传统的定向扩散路由算法的扩展,在保证业务可靠性要求的前提下,组合利用“路径节点最小能量/路径能耗”和“最小跳数”信息,提出了一种针对尽力而为业务和实时业务的QoS路由算法。仿真结果表明,扩展后的算法能满足业务的可靠性要求,随信道错误率的增加,它能更好地均衡网络各节点的能耗。     

基于QoS和分簇机制的WMSNs路由算法研究

针对无线多媒体传感器网络中如何设计具有服务质量保证的路由算法问题,综合考虑的了节点间标准化后的丢包率、延迟、剩余能量、可用存储四个参数,提出算法ED-ACO(Energy and best distribution of Cluster Head Distance-Ant colony optimization )。ED-ACO算法采用基于剩余能量和簇首最佳距离分布的分簇结构,均匀划分网络,将节点的丢包率,延迟,剩余能量,可用存储标准化为具体参数,考虑到蚁群算法的状态转移概率公式中,利用该公式去选择下一跳路径传送感知数据,同时满足了服务质量要求。NS2仿真结果表明,与经典的AODV算法相比,在丢包率,延迟上保证了服务质量要求。     

长链型无线传感器网络QoS路由优化的研究*

针对输电线路监测系统对无线传感器网络实时性和可靠性要求较高的特点,在抽象出的长链型传感器网络QoS路由模型中把网络带宽、时延、跳数、收包率作为链路约束,寻求网络中的最优数据传输路径。考虑到基本蚁群算法存在收敛速度慢、易陷入局部最优等缺陷,提出一种用自适应蚁群算法求解最优路径的方法。仿真结果表明,改进的算法通过自适应地调整信息素挥发因子,能够快速地找到满足约束的最优路径,网络规模越大其优势越明显,保证了用于输电线路监测的无线传感器网络数据传输的服务质量。     

Hierarchical Cellular-Based management for mobile hosts in Ad-Hoc wireless networks

This study proposes a hierarchical Cellular-Based management model for Mobile Ad-Hoc Networks. The proposed management model allows the mobile host to establish a stable communication path with fewer flooding messages and smaller hop count. In the single-level management, a host is selected to act as manager, constructing a communication path and managing the mobile hosts in a specific cellular region to significantly reduce the number of flooding packets. Two-level management is also proposed, to reduce the hop count and enhance the efficiency of constructing the QoS routing path. The Cellular-Based management model is compared with Triangular- and Zone-based management models. Performance evaluation shows that hierarchical Cellular-Based management more efficiently reduces the number of flooding messages and the hop count of the routing paths.     

基于OLSR的QoS路由新方案

基于OLSR协议及扩展的最短路径算法,提出了综合折中跳数与带宽的一种路由计算新量度。组合MPR选择算法及路由计算新量度,设计了三种新的QoS路由方案。基于在NS-2环境中对新路由方案及OLSR原始协议进行的仿真,着重分析比较了它们的时延及分组递交率性能,探讨了带宽量度用于路由计算时对这两项性能产生的影响及主要原因,结果表明新量度能有效实现跳数少与带宽大之间的折中。     

基于MPLS网络的选播QoS路由算法

提出一种基于MPLS网络且保证QoS的选播路由算法。使用链路状态路由协议,找到一条从发出请求的客户到服务器方向上最小跳数的最优路径,该路径能满足选播服务带宽要求。使用度量为路径逆向(服务器到客户)上的链路带宽值,通过约束路由的标记分发协议,建立一条从服务器到客户方向的标记交换路径,并预留资源。仿真结果表明,在传输服务数据流时,该算法的时延及丢包率性能良好,能在一定程度上平衡服务器的负载。     

A Cross-Layer Optimization and Design approach under QoS constraints for green IP over WDM networks

Energy consumption of communication networks is growing very fast due to the rapidly increasing traffic demands. It is important and valuable to find a way to save power for such networking systems. In this paper, we propose a Cross-Layer Optimization and Design (CLOD) approach to improve the energy efficiency of Internet Protocol (IP) over Wavelength Division Multiplexing (WDM) backbone networks under QoS constraints. CLOD makes use of the skew spatial distribution (i.e. 80–20 law) of traffic demands to construct the virtual topology of IP layer with a consideration of the cross-layer resource constraints. Also, CLOD takes advantage of the constraint-based routing to satisfy the QoS constraints in terms of allowed maximum hop count and allowed maximum link utilization. Taking into account the connection between base network design and network operation, CLOD dimensions the base network by using pattern of network operation and optimizes network power consumption by reconfiguring network to adapt traffic variation and the available resources. Simulation results indicate that CLOD can save power significantly and achieve near energy-proportional networks. In addition, an analysis on trade-off performance between the hop count and power consumption is given.     

多约束QoS多播路由选择优化算法研究

研究了一类通信网络中源节点到目的节点的多约束QoS多播路由选择问题,提出了一种解决此类问题的算法.该算法将带宽、时延、丢失率等QoS参数作为约束条件,用基于最短路径算法构造路径选择函数,并依照该函数修正被选路径,使其满足多约束条件.仿真结果表明该算法有较好的性能和较小的时间复杂度,可以方便地推广到多个QoS参数的情况.     

An efficient hop count routing protocol for wireless ad hoc networks

An efcient hop count route fnding approach for mobile ad hoc network is presented in this paper.It is an adaptive routing protocol that has a tradeof between transmission power and hop count for wireless ad hoc networks.During the route fnding process,the node can dynamically assign transmission power to nodes along the route.The node who has received route request message compares its power with the threshold power value,and then selects a reasonable route according to discriminating algorithms.This algorithm is an efective solution scheme to wireless ad hoc networks through reasonably selected path to reduce network consumption.Simulation results indicate that the proposed protocol can deliver better performances with respect to energy consumption and end-to-end delay.