一种保证服务数据流QoS的选播路由算法

提出一个目标为保证服务数据流QoS的选播路由算法．算法利用路径逆向带宽、跳数和服务器负载生成能够满足选播数据报所要请求服务数据的QoS要求的路径，并在该路径上路由选播数据报，同时为服务数据预留资源，以此保证选播数据报到达的服务器以及相应网络路径能够为服务数据提供足够的支持．算法免去服务数据资源预留对单播QoS路由算法的依赖；能够提高服务数据资源预留的成功率，并在一定程度上平衡服务器负载；同时还可降低资源预留的消息开销，减少资源预留的建立时间。     

移动自组网模糊逻辑QoS动态源路由算法

该文提出了一种新的移动Ad hoc网络QoS路由算法:模糊逻辑QoS动态源路由算法。算法从模糊理论的思想出发,将业务的多个QoS参数进行综合评判产生一类以语言变量描述的请求,在修改动态源路由协议为多径路由算法的基础之上,对比各条路径综合模糊路由状态,选择出最适合业务请求的路径。仿真显示算法在支持QoS的同时对移动Ad hoc网络因拓扑动态变化而引起的信息不精确性有很好的适应度。     

基于3GPP2框架的无线移动网络的RSVP扩展研究

本文讨论了面向固定网络设计的RSVP协议应用于无线移动网络需要解决的问题,并针对3GPP2框架下的无线移动网络提出了一种RSVP扩展方案.该方案采用隧道预留技术建立端-端主动预留,为数据连接提供服务质量保证;采用移动预测和被动预留技术在移动节点可能进入的蜂窝内提前预留无线资源,提高切换成功的概率;通过采用主动切换技术减小预留路径调整的时间,进一步提高通信的连续性.     

无线Ad Hoc网络中的QoS路由协议

无线Ad Hoc网络的应用环境以及与Internet的互连都要求其必须提供一定的服务质量(QoS)保证,QoS路由技术是在无线Ad Hoc网络中实现QoS的重要方法。本文对近年来国内外在无线Ad Hoc网络中的QoS路由技术方面取得的研究成果进行了全面的概括总结和分类,对资源预留路由、多径路由和跨层优化路由3类QoS路由协议进行比较分析,并且提出了QoS路由技术亟待解决的问题和今后的发展方向。     

移动Ad Hoc网络中的QoS路由研究

移动自组网是一种无基础设施的无线多跳新型网络。如何在移动自组网中提供不同的QoS保证是其面临的一个重要问题，而QoS路由则是其中的核心技术和热点问题。目前研究人员已经提出了几种QoS路由协议．但都是通过在具体的路由协议中增加QoS参数约束路由来保证QoS，仍存在一些问题，需要进一步研究和改进。     

基于动态信道预约的自适应QoS切换算法

未来无线网络将为固定和移动用户提供多媒体通信和计算业务．为移动用户提供无线多媒体业务的一个最关键的挑战是保证端到端连接的业务质量．通过重复使用无线频谱的微蜂窝或微微蜂窝结构是一个有前途的改善移动多媒体网络容量的方式．但切换次数随着蜂窝大小的降低而增加．移动多媒体网络的一个至关重要的问题是需要可以满足各种QoS需要且有更高资源利用率的有效切换方式．该文提出了一种称为基于动态信道预约的自适应QoS切换算法,并与其它切换方式进行了性能比较．     

移动自组网络MANET路由策略综述

路由策略是网络技术研究的焦点问题之一。由于移动自组网络MANET中节点的动态性和节点资源的有限性,以及多媒体应用服务质量的需求,导致在MANET网络实现路由存在诸多困难。综述了目前文献中基于MANET网络的普通路由协议和满足服务质量需求的QoS路由协议/算法,详细说明了不同协议的实现过程和存在的优缺点,并指出了目前路由策略研究中存在的问题和将来的发展方向。     

IP QoS研究的现状与发展趋势

目前，随着电信业务的引入，IP网的服务质量（IP QoS）成为下一代Internet的重要研究课题。由于IP协议的无连接特性和IP网络松散的控制管理方式，使这项研究面临很大的挑战。IPQoS的研究范围十分广泛，不仅包含路由和业务流量控制，还涉及到网络管理、计费和网络测量。当前主要的IP QoS技术集成服务（IntServ）集成服务的基本思想是在传送数据之前，根据业务的QoS需求进行网络资源预留，从而为该数据流提供端到端的QoS保证。资源预留协议（RSVP）是集成服务的核心。这是一种信令协议，用来通知网络节点预留资源。如果资源预留失…     

基于移动Agent技术的QoS保障机制

介绍了移动Agent的基本特性。移动Agent可在异构的网络各个节点间自由地移动,它能感知网络的状态,监控系统并与其他Agent进行交互。IETF的IS模型采用了RSVP(ResourcereSerVationProtocol)协议对系统资源进行预留,从而达到一定程度上保障所需QoS的目的。QoS保障机制将移动agent技术与RSVP协议结合起来,通过资源预留和agent动态移动的实现可以达到更好地改善QoS的目的。     

无线 Mesh 网络中多路径路由算法的研究

针对无线 Mesh 网络中传统单径路由协议的不足,提出一种基于动态源路由协议(DSR)的多路径路由算法(IDSR).该算法通过在路由发现过程引入带宽和最大转发次数等限制条件,保证了多条路由请求信息的获取;通过在节点不相交的多径选择过程中引入多 QoS 路由代价函数,有效地实现多路径的选择;通过提供多 QoS 保障,使算法具有较高的求解效率,避免了单径路由的不稳定等特点.实验结果表明,IDSR 算法在无线 Mesh 网络的路由中具有更好的 QoS 性能.     

一种具有能量感知的多路径Ad hoc路由算法

该文针对无线移动Ad hoc网络的动态变化拓扑逻辑,存在单向链路,节点能量有限等特点,提出了一种具有能量感知的多路径路由算法。该算法是一种反应式的基于路径池的多路径路由算法,数据和应答消息的路由根据路由池中路径的性能尺度,即跳数、可靠性和剩余能量以一定的概率分布随机选择。路径的可靠性和剩余能量在数据传输过程中动态更新。仿真结果表明该算法能有效地延长网络的生存时间。     

QoS routing based on multi-class nodes for mobile ad hoc networks

In this paper, we present a new quality of service (QoS) routing protocol for mobile ad hoc networks (MANETs). Most of the existing routing protocols assume homogeneous nodes in MANETs, i.e., all nodes have the same communication capabilities and characteristics. However, in many ad hoc networks, nodes are not the same. Some nodes have longer transmission range, larger transmission bandwidth, and are more reliable and robust than other nodes. We take advantage of the non-homogeneous property to design more efficient QoS routing protocol. And node location information is used to aid routing. We also develop a new algorithm to calculate end-to-end bandwidth for a given path. Our QoS routing protocol contains end-to-end bandwidth calculation and bandwidth reservation. QoS route is discovered and setup only when it is needed. Extensive simulation studies demonstrate the good performance of the QoS routing protocol.     

能量感知和链路稳定度的多径MANET路由

在移动自组织网络中,相对于单路径路由算法而言,多路径路由算法可以均衡网络负载、提高路由的可靠性。通过对AOMDV路由协议进行改进,提出了基于能量感知和链路稳定度的多径MANET路由协议ELMRP。ELMRP协议综合考虑了节点的剩余能量和链路稳定度,根据路径的剩余能量和稳定度计算代价值,按照代价值在多条节点不相交路径上分配数据流量。仿真结果表明,和AOMDV路由协议相比,ELMRP协议延长了网络的生存时间,提高了数据分组递送率,降低了路由发现频度。     

MM-DSR: Multipath QoS routing for multiple multimedia sources over Ad Hoc mobile networks

Nowadays, services over Mobile Ad hoc Networks (MANETs) are becoming more used, and multimedia services such as video-streaming applications are more demanded. Hence, it is necessary to provide end-to-end QoS over MANETs, although it poses a challenging problem due to the ephemeral structure of these networks. MM-DSR (Multipath Multimedia Dynamic Source Routing) is a multipath routing protocol DSR-based merged with a cross-layer algorithm which is able to provide QoS for multiple sources of video over IEEE 802.11b Ad Hoc networks. The weaknesses of the system with plain DSR and IEEE 802.11b have been analysed and work has been done in order to improve the throughput and the final user quality. The performance of video-streaming applications has been improved under high traffic load conditions over mobile Ad Hoc networks.     

Route Stability Based QoS Routing in Mobile Ad Hoc Networks

To provide high quality communications service among mobile wireless devices is basically a challenging task in wireless ad hoc networks. In this paper, we propose a Route Stability based QoS Routing (RSQR) protocol in Mobile Ad Hoc Networks (MANETs) which is an extension of QoS routing with throughput and delay constraints. Ensuring a data path to be valid for sufficiently longer period of time is a very difficult problem in MANET due to its highly dynamic nature. We propose a simple model for computing link stability and route stability based on received signal strengths. By including some extra fields in route request/reply packets, the route stability information can be utilized to select a route with higher stability among all the feasible routes between a given source destination pair. Further, inclusion of a signal strength based admission control enhances the performance of the routing. Results of our experiments show performance improvements in terms of packet delivery ratio, control overhead and average end-to-end delay in comparison with a QoS routing protocol proposed by Q. Xue and A. Ganz.     

Delay constraint multipath routing for wireless multimedia ad hoc networks

According to the disadvantages of real time and continuity for multimedia services in ad hoc networks, a delay constraint multipath routing protocol for wireless multimedia ad hoc networks, which can satisfy quality of service (QoS) requirement (QoS multipath optimized link state routing [MOLSR]), is proposed. The protocol firstly detects and analyzes the link delay among the nodes and collects the delay information as the routing metric by HELLO message and topology control message. Then, through using the improved multipath Dijkstra algorithm for path selection, the protocol can gain the minimum delay path from the source node to the other nodes. Finally, when the route is launched, several node‐disjoint or link‐disjoint multipaths will be built through the route computation. The simulation and test results show that QoS‐MOLSR is suitable for large and dense networks with heavy traffic. It can improve the real time and reliability for multimedia transmission in wireless multimedia ad hoc networks. The average end‐to‐end delay of QoS‐MOLSR is four times less than the optimized link state routing. Copyright © 2014 John Wiley & Sons, Ltd.     

一种新型的Ad hoc QoS多播路由协议

无线自组织（Ad hoc）网络的应用环境要求其必须提供一定的服务质量（QoS）保证，然而，无线信道固有的特点及节点移动造成网络拓扑的频繁变化，使得在无线Ad hoc网络中支持QoS较困难。可以采用Ad hoc QoS多播（AQM）协议通过事先预约邻居节点以跟踪资源的有效性等措施来解决这一问题。通过考虑传输时延、丢失率、带宽要求、时延抖动、吞吐量等QoS指标，寻找满足特定QoS要求的路由，AQM协议可以明显地改善多播通信的性能。网络仿真结果表明AQM协议基本适合Adhoc网络。     

The Mobility Issue in Admission Controls and Available Bandwidth Measures in MANets

This paper is focused on the QoS (Quality of Service) in IEEE 802.11 MANETs (Mobile Ad hoc Networks). The QoS support like resources allocation in any network is relied to the ability to estimate the availability of these resources. The bandwidth is main resource, which the estimation of its availability is an open issue to research in MANets. In order to improve the available bandwidth measurements, this paper proposes a new approach named IBEM (Improved Bandwidth Estimations through Mobility incorporation) in IEEE 802.11 MANets. Seen that the measurement failures in MANets are due to neglecting some features of such networks, and mobility is the principal characteristic. The mobility is neglected in all existing bandwidth measurement approaches. The proposed approach aims to incorporate the mobility criteria in the available bandwidth estimations with specific manner. The comparative results with bandwidth estimation methods in the literature testify the improvement brought by this approach.     

移动自组织网络中基于树结构的优化组播路由算法(英)

Mobile Ad hoc Networks(MANETs) play an important role in emergency communications where network needs to be constructed temporarily and quickly.Since the nodes move randomly,routing protocols must be highly effective and reliable to guarantee successful packet delivery.Based on the data delivery structure,most of the existing multicast routing protocols can be classified into two folders:tree-based and mesh-based.We observe that tree-based ones have high forwarding efficiency and low consumptions of bandwidth,and they may have poor robustness because only one link exists between two nodes.As a treebased multicast routing protocol,MAODV(Multicast Ad hoc On-demand Vector) shows an excellent performance in lightweight ad hoc networks.As the load of network increases,QoS(Quality of Service) is degraded obviously.In this paper,we analyze the impact of network load on MAODV protocol,and propose an optimized protocol MAODV-BB(Multicast Ad hoc On-demand Vector with Backup Branches),which improves robustness of the MAODV protocol by combining advantages of the tree structure and the mesh structure.It not only can update shorter tree branches but also construct a multicast tree with backup branches.Mathematical analysis and simulation results both demonstrate that the MAODV-BB protocol improves the network performance over conventional MAODV in heavy load ad hoc networks.     

QoS issues in ad hoc wireless networks

Ad hoc wireless networks consist of mobile nodes interconnected by multihop communication paths. Unlike conventional wireless networks, ad hoc networks have no fixed network infrastructure or administrative support. The topology of the network changes dynamically as mobile nodes join or depart the network or radio links between nodes become unusable. This article addresses some of the quality of service issues for ad hoc networks which have started to receive increasing attention in the literature. The focus is on QoS routing. This is a complex and difficult issue because of the dynamic nature of the network topology and generally imprecise network state information. We present the basic concepts and discuss some of the results. The article concludes with some observations on the open areas for further investigation