异构环境下基于移动代理的主动自组网构架

分析了移动自组网的异构性、路由协议和能量保护问题,应用移动代理和主动网络技术,给出了一个开放的、扩展性强的基于移动代理的主动自组网构架,该构架通过分群策略,使多个路由协议能在异构环境下并行工作,而且也满足移动节点能量保护的需求。     

MANET环境下基于能量保护的路由策略及其研究进展

移动Ad hoc网络是由一组带有无线收发装置的移动节点组成的一个支持多跳的临时性的网络自治系统。由于移动自组网的大多数节点是由有限寿命的电池来提供能量,因此节能策略正逐步成为设计和评价路由协议的一个重要依据。通过分析现有移动自组网的节能路由策略,给出了未来该领域的若干研究方向。     

一种自组网功率控制算法及分析

无线自组网中的移动节点大多依靠电池提供能量,因此能量是影响无线自组网性能的一个很大的瓶颈,作为事实上的无线自组网媒体接入协议,802.11并没有动态调整传输功率的能力,大大限制了网络的生存时间。采用功率控制可以提高节点的功率使用效率,减少相邻节点间的干扰,改善网络的性能。在802.11基础上提出一种基于信噪比的动态传输功率控制算法。通过进行计算机仿真,与802.11协议相比,在保持吞吐量性能的前提下,大大减少了节点的功率消耗,提高了节点的能量利用率。     

无线自组织网传输功率控制与跨层优化

无线自组织网节点功率有限，如何有效利用节点电量、改善网络性能是自组网领域研究的关键问题。首先讨论了节点传输功率对各协议层的影响，并归纳出功率控制的设计原则；然后分类介绍和比较了几种主要的控制机制。在传统协议分层研究的基础上，提出了对传输功率控制进行跨层优化的设计思想，并对运用跨层优化的困难给予了阐述；最后给出了传输功率控制领域最新的一些研究方向。     

Ad Hoc网络功率控制与跨层优化

无线自组织网节点功率有限,如何有效利用节点电量、改善网络性能是自组网领域研究的关键问题。在功率控制中引入跨层优化的机制,可以有效地开发现有资源,提高网络性能。阐述Ad Hoc网络功率控制的意义与作用,详细论述MAC层的功率控制,网络层的功率控制,和采用跨层优化的混合功率控制技术,并提出一些值得关注的研究课题。     

移动自组网CBTC算法分析与研究

移动自组网中各移动节点的能量消耗比较大,而大多数节点都是由有限寿命的电 池来提供的,因此在制定路由协议时必须考虑其能量保护。拓扑控制算法通过控制结点的传 输范围使生成的网络拓扑满足一定的性质,以延长网络生命周期,降低网络干扰。详细分析了 cone-based拓扑控制算法(CBTC),及其进行改进以适应自组网移动性的特点。     

移动自组网安全性的研究

移动自组网(MANET)是新型的无线移动网络，它不依赖固定网络设施，是能快速展开、自治、多跳的网络结构。它由一组带有无线收发装置的节点组成，整个网络通过移动节点间的相互协作保持网络互联。网络中的每个节点都能快速移动，同时具备主机和路由器功能。移动自组网的前身是分组无线     

移动自组网安全的性研究

1 移动自组网的特点移动自组网( MANET )是新型的无线移动网络,它不依赖固定网络设施,是能快速展开、自治、多跳的网络结构。它由一组带有无线收发装置的节点组成,整个网络通过移动节点间的相互协作保持网络互联。网络中的每个节点都能快速移动,同时具备主机和路由器功能。移动自组网的前身是分组无线网(packet radio),美国国防部远景规划局( DARPR )于20 世纪70 年代启动该研究项目,最初的研究是为了满足军事需要。1996 年,因特网任务工程组(IEFT )成立了专门的移动自组网小组。与其他网络相比,移动自组网具有以下特点: (…     

移动自组网基于地理位置信息的能量辅助路由协议

针对移动自组网网络生存时间较短、传统按需路由协议开销大且易断裂的问题,文中提出一种移动自组网基于地理位置信息的能量辅助路由协议LEAODV(Location-Energy-AODV).传统按需距离矢量协议以广播方式进行路由发现,路由开销大且未考虑节点能量耗尽而造成路由断裂问题.LEAODV路由协议考虑通信节点地理位置信...     

基于自组网的节能协作算法

自组网是兼做路由器的移动节点组成的移动无线网络，不依靠通信基础设施。本文提出了一个工作于物理层和MAC层之上、网络层之下的基于自组网的节能协作算法，其核心思想是构造虚拟主干网，使位于虚拟主干网外的节点工作于休眠状态，从而减少电源消耗。     

Cross‐layer design for topology control and routing in MANETs

A mobile ad hoc network (MANET) is a self‐organized and adaptive wireless network formed by dynamically gathering mobile nodes. Since the topology of the network is constantly changing, the issue of routing packets and energy conservation become challenging tasks. In this paper, we propose a cross‐layer design that jointly considers routing and topology control taking mobility and interference into account for MANETs. We called the proposed protocol as Mobility‐aware Routing and Interference‐aware Topology control (MRIT) protocol. The main objective of the proposed protocol is to increase the network lifetime, reduce energy consumption, and find stable end‐to‐end routes for MANETs. We evaluate the performance of the proposed protocol by comprehensively simulating a set of random MANET environments. The results show that the proposed protocol reduces energy consumption rate, end‐to‐end delay, interference while preserving throughput and network connectivity. Copyright © 2010 John Wiley & Sons, Ltd.     

基于多信道的自组织网络功率控制方法

为解决自组网中功率控制引发的碰撞问题,通过引入多信道技术,结合网络层最小功率路由策略,实现了基于多信道功率可控的自组织网络架构MCBPC。该架构控制了拓扑结构的频繁变化,降低了因功率控制带来的碰撞机率,并实现了节省能量的目的。通过NS-2仿真实验验证,相比基于802.11的AODV架构,MCBPC在成功递交分组数、网络生存时间上均提高了90%以上,分组成功递交率也提高达30%以上。     

Cross layer coordinated energy saving strategy in manet

Mobile Ad hoc NETwork (MANET) consists of a set of mobile hosts which can operate independently without infrastructure base stations. Energy saving is a critical issue for MANET since most mobile hosts will operate on battery powers. A cross layer coordinated framework for energy saving is proposed in this letter. On-demand power management, physical layer and medium access control layer dialogue based multi-packet reception, mobile agent based topology discovery and topology control based transmit power-aware and battery power-aware dynamic source routing are some of new ideas in this framework.     

A novel efficient power‐saving MAC protocol for multi‐hop MANETs

Following recent advances in the performance of ad hoc networks, the limited life of batteries in mobile devices poses a bottleneck in their development. Consequently, how to minimize power consumption in the Medium Access Control (MAC) layer of ad hoc networks is an essential issue. The power‐saving mode (PSM) of IEEE 802.11 involves the Timing Synchronization Function to reduce power consumption for single‐hop mobile ad hoc networks (MANETs). However, the IEEE 802.11 PSM is known to result in unnecessary energy consumption as well as the problems of overheating and back‐off time delay. Hence, this study presents an efficient power‐saving MAC protocol, called p‐MANET, based on a Multi‐hop Time Synchronization Protocol, which involves a hibernation mechanism, a beacon inhibition mechanism, and a low‐latency next‐hop selection mechanism for general‐purpose multi‐hop MANETs. The main purposes of the p‐MANET protocol are to reduce significantly the power consumption and the transmission latency. In the hibernation mechanism, each p‐MANET node needs only to wake up during one out of every N beacon interval, where N is the number of beacon intervals in a cycle. Thus, efficient power consumption is achieved. Furthermore, a beacon inhibition mechanism is proposed to prevent the beacon storm problem that is caused by synchronization and neighbor discovery messages. Finally, the low‐latency next‐hop selection mechanism is designed to yield low transmission latency. Each p‐MANET node is aware of the active beacon intervals of its neighbors by using a hash function, such that it can easily forward packets to a neighbor in active mode or with the least remaining time to wake up. As a consequence, upper‐layer routing protocols can cooperate with p‐MANET to select the next‐hop neighbor with the best forwarding delay. To verify the proposed design and demonstrate the favorable performance of the proposed p‐MANET, we present the theoretical analysis related to p‐MANET and also perform experimental simulations. The numerical results show that p‐MANET reduces power consumption and routing latency and performs well in extending lifetime with a small neighbor discovery time. Copyright © 2011 John Wiley & Sons, Ltd.     

移动自组织网络QoS研究

由于自组网独特的特性,在该网络中支持QoS非常困难,需要进行系统研究。本文首先分析了自组网中QoS支持面临的挑战,接着从系统角度出发,结合自组网的特点,在QoS模型和QoS支持体系以及体系中具体的QoS技术等方面对自组网QoS支持做了详尽的分析与探讨,同时指出：定义自组网QoS模型需要综合考虑应用需求和网络特性;实现QoS模型可以采用分层QoS支持体系或跨层QoS支持体系,而后者将是今后研究的重点;结合路由层、MAC层和物理层的跨层QoS支持体系具有研究价值。     

无线Mesh网中的Quorum节能机制

无线Mesh网络节能问题十分重要。文章讨论的基于Quorum的节能机制对网络规模、节点密度、移动性和多跳等因素不敏感,非常适合无线Mesh网络。Quorum节能机制主要基于MANET网络环境设计。Quorum系统根据时钟同步的难易程度,可以应用于同步和异步两种工作模式。目前对Quorum节能系统的研究主要集中在能量效率优化和自适应系统方面。对于异步和同步两种模式的协同,基于Quorum机制的节能与功率控制、MAC路由结合的跨层设计,是值得尝试的课题。     

Quorum-Based Energy Conserving Mechanism in Wireless Mesh Networks

Energy conservation is an important issue for wireless Mesh network. The Quorum energy conserving mechanism, discussed in this article, is quite suitable to wireless Mesh networks because it is insensitive to network scale, host density, mobility and multi-hop. Originally designed for the Mobile Ad hoc Network (MANET) environment, the Quorum mechanism can work in two modes: synchronous and asynchronous, according to the difficulty of clock synchronization. Currently, the research on Quorum energy conserving systems focuses on energy efficiency optimization and adaptive system. As for other issues, such as the collaboration between synchronous and asynchronous working modes, and the cross-layer design for integrating Quorum mechanism-based energy conservation with power control and MAC routing, there is much research to do.