多跳无线移动Ad Hoc网络路由协议的研究分析

无线移动Ad Hoe网络(MANET)作为可移动分布式多跳无线网络，没有预先确定的网络拓扑或网络基础设施以及集中控制．为了在如此的网络中促进通信，路由协议主要用于在节点之间发现路径．Ad Hoe网络路由协议的主要目的是网络拓扑的动态变化、任意两个节点之间建立一个使得通信总费用和带宽消费最少的正确和有效的通信路径．描述了设计移动Ad Hoe网络路由协议所面临的问题以及对它们的评价，详细比较了七种典型无线移动AdHoe网络路由协议的特性和功能，即DSDV，CGSR，WRP，AODV，DSR，TORA和ABR，为进一步的研究提出了新的课题．     

p-RWBO:a novel low-collision and QoS-supported MAC for wireless ad hoc networks

QoS supported MAC mechanism is a key issue for supporting QoS in wireless ad hoc networks. A new backoff algorithm,named RWBO BEB,was proposed previously to decrease the packet collision probability significantly. In this paper,it is explored how to make RWBO BEB support service differentiation in wireless ad hoc networks,and a novel proportional service differentiation algorithm,named p-RWBO,is proposed to allocate the wireless bandwidth according to the bandwidth ratio of each station. In p-RWBO,station n's walking probability(pw,n) is selected according to its allocated bandwidth ratio. An analytical model is proposed to analyze how to choose pw,n according to the bandwidth ratios of station n. The simulation results indicate that p-RWBO can differentiate services in terms of both bandwidth and delay.     

<Emphasis Type="Italic">p</Emphasis>-RWBO: a novel low-collision and QoS-supported MAC for wireless ad hoc networks

QoS supported MAC mechanism is a key issue for supporting QoS in wireless ad hoc networks. A new backoff algorithm, named RWBO＋BEB, was proposed previ- ously to decrease the packet collision probability significantly. In this paper, it is explored how to make RWBO＋BEB support service differentiation in wireless ad hoc networks, and a novel proportional service differentiation algorithm, named p-RWBO, is proposed to allocate the wireless bandwidth according to the band- width ratio of each station. In p-RWBO, station n＇s walking probability （Pw,n） is selected according to its allocated bandwidth ratio. An analytical model is proposed to analyze how to choose Pw, n according to the bandwidth ratios of station n. The simulation results indicate that p-RWBO can differentiate services in terms of both bandwidth and delay.     

无线自组织网中的入侵检测技术

主要对无线自组织网络中的入侵检测技术做一综述,并介绍了多种不同的适用无线自组织网络的入侵检测技术,最后为无线自组织网络提出一种混合式的入侵检测系统模型,对无线自组网入侵检测技术研究有所帮助。     

无线Ad hoc网络中面向能量有效的拓扑控制研究

提高网络的能量有效性是Ad hoc网络设计的重要目标之一,拓扑控制是从网络级层面提高Ad hoc网络能量有效性的一种重要手段。对面向能量有效的两种基本拓扑控制机制进行了介绍,重点分析、总结了基于发射功率控制的能量有效拓扑控制的现有研究情况,最后指出了该领域的一些研究方向。     

无线传感器网络路由协议分类研究

无线传感器网络具有与传统网络不同的特点,且与应用高度相关。传统网络及移动自组织网络的路由协议不能有效地用于无线传感器网络,因而研究人员提出了众多的路由协议。在介绍了无线传感器网络的特点及路由协议设计的关键问题之后,总结分析了现存的路由协议的分类方法,并对各类路由协议从路由策略、路由协议的特点、性能等多方面进行了对比分析,指出了各类路由协议的优缺点及其包含的路由协议。最后总结出未来的研究热点和发展趋势。     

自私无线Ad Hoc网络中一个低开销的诚实能效路由协议

一种激励自私无线Ad Hoc网络中节点合作的方法,向提供报文传输服务的节点提供不低于其传输成本的报酬。低开销诚实路由协议LOTER引入了VCG机制,节点在路由发现阶段收集邻居节点的信息,目标节点选择多条RREP路径,位于RREP路径上的节点将邻居节点信息沿RREP路径报告给源节点,源节点完成LCP路由选择和VCG报酬的计算。LOTER协议以低的报文开销收集网络拓扑信息,有效实现了自私无线Ad Hoc网络中的诚实能效路由。仿真结果表明,与现有协议比较,该协议具有更好的性能。     

An Application of an Initialization Protocol to Permutation Routing in a Single-Hop Mobile Ad Hoc Networks

In 1999 Nakano, Olariu, and Schwing in [20], they showed that the permutation routing of n items pretitled on a mobile ad hoc network (MANET for short) of p stations (p known) and k channels (MANET{(n, p, k)) with k < p, can be carried out in broadcast rounds if k p and if each station has a -memory locations. And if k and if each station has a -memory locations, the permutations of these n pretitled items can be done also in broadcast rounds. They used two assumptions: first they suppose that each station of the mobile ad hoc network has an identifier beforehand. Secondly, the stations are partitioned into k groups such that each group has stations, but it was not shown how this partition can be obtained. In this paper, the stations have not identifiers beforehand and p is unknown. We develop a protocol which first names the stations, secondly gives the value of p, and partitions stations in groups of stations. Finally we show that the permutation routing problem can be solved on it in broadcast rounds in the worst case. It can be solved in broadcast rounds in the better case. Note that our approach does not impose any restriction on k.     

认知无线电自组织网络MAC协议

随着无线频谱资源短缺问题的日益突出,认知无线电网络得到了广泛关注和研究.在这类网络中,媒体接入控制MAC协议是关键技术之一.特别是在认知无线电自组织网络中,因为缺乏中心基础设施的支持,MAC协议的设计面临着巨大的挑战.除了媒体接入控制等传统问题之外,这些挑战还包括如何保证主用户的业务质量,如何有效认知并管理频谱资源等.文中首先介绍了认知无线电自组织网络MAC协议的最新研究进展,然后对一些典型协议进行了比较分析,最后对未来的研究方向进行了探讨.     

无线自组网中一种高效的路由协议

无线自组网与传统的有线网不同;它由一些可移动的结点组成;这些结点的带宽、计算能力和能量都受到一定限制。针对这种网络;研究者们提出了按需路由协议;这些协议非常适合无线自组网这种拓扑结构;但是由于缺乏对全局拓扑和结点移动性的了解;可能达不到最优。因此提出了一种高效的路由协议ERNC;该协议基于已提出的SHORT路由协议[13];并对以前所提出的NAOR协议[14]进行了扩展;即利用网络编码技术来进一步提高路由协议的性能。最后;使用NS-2模拟器来评估ERNC的性能;结果显示ERNC在分组投递率和平均端到端时延等方面获得了比已有协议更好的性能。     

无线ad hoc网络中区分服务存在的问题研究

对无线ad hoc网络中的区分服务进行了仿真,发现区分服务机制为业务流分配的带宽资源与其优先级调度机制的权值比例并不总是保持一致。结合仿真记录文件进行分析,得出造成这一现象的原因是由于受到MAC机制具有带宽分配的能力。最后指出,在无线ad hoc网络中,单纯依靠网络层的区分服务机制并不能实现成比例的分配带宽。     

A Self-selection Technique for Flooding and Routing in Wireless Ad-hoc Networks

There is a fundamental difference between wireless and wired networks, since the latter employ point-to-point communication while the former use broadcast transmission as the communication primitive. In this paper, we describe an algorithm, called self-selection, which takes advantage of broadcast communication to efficiently implement the basic operation of selecting a node possessing some desired properties among all the neighbors of the requestor. Self-selection employs a prioritized transmission back-off delay scheme in which each node’s delay of transmitting a signal is dependent on the probability of the node’s ability to best perform a pertinent task, and in turn, enables the node to autonomously select itself for the task. We demonstrate the benefits of self-selection in two basic wireless ad hoc network communication algorithms: flooding and routing. By relating back-off delay to the signal strength of a received packet, we design an efficient variant of conventional flooding called Signal Strength Aware Flooding. By using distance-to-destination to derive back-off delay, we design a novel and fault-tolerant wireless ad hoc network routing protocol named Self-Selective Routing.

军用无线移动自组织通信系统媒质接入技术概述

无线移动自组织网络的发展为新一代军事通信系统的发展注入了新的生命力。媒质接入技术是无线移动自组织网络的关键技术之一。本文介绍了美军近年来研发的基于移动自组织网技术的军用无线通信系统并对媒质接入问题进行了分析与总结。     

移动自组织网络应用层组播研究

移动自组织网络的应用迫切要求组播支持。应用层组播是解决组播问题的一种有效的方案。针对目前移动自组网络中网络层组播出现的问题,深入研究了移动自组织网络应用层组播,并作了详尽的性能比较。深入分析了移动自组织网络覆盖组播的优势,并指出了移动自组织网络组播亟待解决的问题,为新的移动自组织网络应用层组播研究提供了非常有价值的研究方向。     

多速率Ad hoc网络MAC层公平性的分析与改进

在多速率Ad hoc网络中,利用自适应速率调整算法,网络节点可以根据信道质量选择不同的传输速率,从而提高网络的总体通信能力。对多速率Ad hoc网络MAC层公平性进行了仿真和分析,实验结果表明基于IEEE 802.11的多速率Ad hoc网络中存在严重的公平性问题。通过对吞吐率公平和时间公平的讨论,指出在多速率Ad hoc网络中进行MAC层公平性研究,时间公平性标准是较优的选择。另外提出一种针对多速率Ad hoc网络的改进公平回退（EFB）算法,仿真实验的结果表明该算法能够明显提高多速率Ad hoc网络的MAC层公平性。     

Secure Mutual Authentication for Ad hoc Wireless Networks

As wireless LANs and wireless terminals deployed, security and authentication, among other things, became important. We propose a mutual authentication scheme for access security among wireless terminals. We use user identification together with hardware identification in creating a certificate for the wireless access. And authentication is performed based on the certificate. It enables reliable user authentication, establishment and check of access rights (when a terminal is managed in connection with a network gateway), Peer-to-Peer access with authentication, and international roaming of terminals.This work was supported by the Korea Research Foundation Grant (KRF-2004-005-D00198).     

Secure mutual authentication for ad hoc wireless networks

As wireless LANs and wireless terminals deployed, security and authentication, among other things, became important. We propose a mutual authentication scheme for access security among wireless terminals. We use user identification together with hardware identification in creating a certificate for the wireless access. And authentication is performed based on the certificate. It enables reliable user authentication, establishment and check of access rights (when a terminal is managed in connection with a network gateway), Peer-to-Peer access with authentication, and international roaming of terminals. This work was supported by the Korea Research Foundation Grant (KRF-2004-005-D00198).