基于网络编码的WSNs数据收集方法

无线传感器网络(WSNs)监测数据的收集方式方法是目前的研究热点,而无线传输的广播特性又使得网络编码非常适合于无线网络。在介绍网络编码原理、核心思想以及在WSNs应用现状的基础上,提出了一种基于部分网络编码的自适应WSNs数据收集方法,该方法针对簇网络拓扑结构,簇成员节点把网络编码数据发送给簇头节点,簇头节点利用随机网络编码的方式把数据传输到Sink节点。实验结果表明:该机制具有能耗较低和汇报数据较准确的特点。     

无线Mesh网中编码感知组播路由协议CAMR

网络编码是一种能够提高网络吞吐量的新技术,将网络编码应用于无线Mesh网组播对Mesh网络进一步实用化有重要意义.编码感知路由是一种能够充分识别和利用网络中的编码机会的路由.虽然已有若干个基于网络编码的单播路由协议,但无线网络中编码机会并没有被充分利用,到目前为止还没有无线Mesh网络中的编码感知组播路由协议.提出一个编码感知组播路由协议CAMR(coding-aware multicast routing).CAMR协议利用了一个新奇的编码感知路由度量CAM(coding-awarerouting metric),可以度量无线Mesh网络中节点的实际编码机会和编码能力的大小.基于CAM设计的CAMR协议可以充分利用无线Mesh网络中节点的编码机会,提高了无线Mesh网络组播的吞吐量.模拟实验验证了CAMR协议的优势及其有效性.     

无线有组织网络

无线有组织网络是网络节点间有内在关系的无基础设施的无线网络,其除具有无基础设施无线网络的特征外,网络有中心节点,且节点位置关系相对固定。这种特殊的网络应用于野外救援、军事活动等临时性通信。首先回顾了对讲机系统、无线分组网络和无线自组织网络等无基础设施无线网络的结构和特点,它们都不能包涵无线有组织网络特征。详细定义了无线有组织网的相关模型,分析了无线有组织网络的特点和研究重点。     

基于网络编码的无线物联网多中继协作切换机制漫谈

随着无线物联网的发展,如何提高其性能速度成为一道难题,而网络编码的出现,正是应了这种需要,明显的提高了无线物联网的性能,受到了许多人的关注与研究。区别于有线网络,无线网络拥有共享信道与信道的时变性,所以为了充分发挥无线物联网的作用,必须提高无线信道的安全性,如今也有一些提升信道可靠性的技术,像中继技术, ARQ技术等。从网络编码技术中还发展出一些有特殊针对性的技术,比如抗搭线窃听的网络编码技术,网络纠错码技术等都在网络安全领域的展开相当的研究。基于网络编码的中继传输技术,可以大大提高系统的可靠性与实效性。本文就基于网络编码的物联网多中继切换机制进行漫谈,介绍一下网络编码的无线传输技术,针对物联网中的比如多中继,多路径的情况与物联网中的网络构造多跳切换场景等等,提出一些可能。     

无线网络中密钥管理技术概述

密钥管理技术是基本的安全技术之一,在无线网络中扮演重要的角色。无线网络中密钥管理技术的研究是近年来的热点。本文概述了无线网络中密钥管理技术,即无线传感器网络和无线自组网络中的密钥管理技术。     

网络编码

网络编码是近年来通信领域的重大突破,其基本思想是网络节点不仅参与数据转发,还参与数据处理,这样可以大幅提高网络性能。该文关注网络编码在无线网络环境中编解码过程。     

无线Mesh网多路径混合包的传输方法

无线Mesh网络是目前无线网络中的研究热点,而Mesh网络中的一个重要瓶颈就是网络吞吐量受到限制.多路径传输可使无线网络获得更高的带宽达到提高吞吐量的目的,然而它也会造成能效降低,调度复杂;因此,提出一种吞吐量能有效提高的方法,将一种改进的新网络编码与多路径结合在一起,通过把数据包以段为单位进行编码,然后把编码后相互独立的多份数据沿多条路径进行传输,有效的降低数据包的重传,减少通信量.在提高吞吐量的同时,保证了数据传输的可靠性.模拟实验结果表明该方法有效.     

谈网络解码在无线网络技术中的应用

网络编码可以优化网络传输的性能,网络编码的基本思想是网络节点不仅对数据进行存储转发,还参与数据处理。网络编码的出现迎合了无线网络技术的发展。本文关注了网络编码在无线网络中的研究和应用,初步探讨了面对网络编码,我们应采取和研究的信息安全措施,同时提出了针对网络编码应着力解决的研究问题以及无线网络技术如何依靠网络编码进行安全有效的信息交换,并对其发展进行了展望。     

基于线性网络编码重传算法的MATLAB仿真分析

近年来,网络编码技术理论飞速发展,为提高无线网络传输的吞吐率和可靠性提供了新的启发点。首先介绍了网络编码理论的发展现状和线性网络编码理论,然后构建了无线网络重传模型,对原有的网络编码无线广播重传(NCWBR)算法和改进型网络编码无线广播重传(ENCWBR)算法进行了MATLAB仿真,证明了ENCWBR算法在高丢包率的条件下确实可以很好地控制重传次数。     

面向物联网的无线传感器网络综述

无线传感器网络是物联网技术应用的关键,其能通过调整固定装置的参数检查外部传感器,实现无线网络环境的有效保护,达到净化网络空间的目的。本文在阐述物联网与无线传感器技术的基础上,就面向物联网的无线传感器网络技术要点展开分析,并指出无线传感器网络优化设计中的注意事项,期望能进一步提升无线传感器网络性能,进而在优化物联网环境的基础上,促进现代信息网络技术的有序发展。     

Survey of network coding-aware routing protocols in wireless networks

In recent times, there have been many advances in the field of information theory and wireless ad hoc network technologies. Regarding information theory progression and its connection with wireless ad hoc networks, this study presents fundamental concepts related to the application of the state-of-the-art Network Coding (NC) within wireless ad hoc networks in the context of routing. To begin with, this paper briefly describes opportunistic routing and identifies differentiation between NC-aware and NC-based routing mechanisms in wireless ad hoc networks. However, our main focus is to provide a survey of available NC-aware routing protocols that make forwarding decisions based on the information of available coding opportunities across several routes within wireless ad hoc networks. The taxonomy and characteristics of various representative NC-aware routing protocols will also be discussed. In summary, we provide a comparison of available NC-aware routing schemes and conclude that NC-aware routing techniques have several advantages over traditional routing in terms of high throughput, high reliability, and lower delay in a wireless scenario. To the best of our knowledge, this work is the first that provides comprehensive discussion about NC-aware routing protocols.     

无线传感器网络分析与仿真

计算机仿真是通信网络研究的有效评估方法之一。无线传感器网络强调对目标现象及其属性的实时感知能力，支持对感知信息的本地处理和节点间协同处理，而传统网络仿真平台并不支持。从网络体系结构和典型应用场景入手，分析无线传感器网络仿真需求，提出结合传统网络通信性能、能耗控制和基础功能实现的网络性能评价指标，并给出基于NS-2的扩展设计和实现。     

Reinforcement learning for context awareness and intelligence in wireless networks: Review, new features and open issues

In wireless networks, context awareness and intelligence are capabilities that enable each host to observe, learn, and respond to its complex and dynamic operating environment in an efficient manner. These capabilities contrast with traditional approaches where each host adheres to a predefined set of rules, and responds accordingly. In recent years, context awareness and intelligence have gained tremendous popularity due to the substantial network-wide performance enhancement they have to offer. In this article, we advocate the use of reinforcement learning (RL) to achieve context awareness and intelligence. The RL approach has been applied in a variety of schemes such as routing, resource management and dynamic channel selection in wireless networks. Examples of wireless networks are mobile ad hoc networks, wireless sensor networks, cellular networks and cognitive radio networks. This article presents an overview of classical RL and three extensions, including events, rules and agent interaction and coordination, to wireless networks. We discuss how several wireless network schemes have been approached using RL to provide network performance enhancement, and also open issues associated with this approach. Throughout the paper, discussions are presented in a tutorial manner, and are related to existing work in order to establish a foundation for further research in this field, specifically, for the improvement of the RL approach in the context of wireless networking, for the improvement of the RL approach through the use of the extensions in existing schemes, as well as for the design and implementation of RL in new schemes.     

无线传感器网络覆盖控制问题

无线传感器网络具有广泛的应用背景,目前已经发展成为一个重要的计算平台。但是,由于无线传感器网络自身的特点,使其也面临许多问题,如何有效地进行覆盖控制,在保证网络覆盖质量的前提下,减少能量消耗,延长网络寿命是其中最重要的问题之一。本文主要讨论无线传感器网络的覆盖控制的问题。     

Efficient link scheduling for online admission control of real-time traffic in wireless mesh networks

Link scheduling is used in wireless mesh networks (WMNs) to guarantee interference-free transmission on the shared wireless medium in a time division multiple access approach. Several papers in the literature address the problem of link scheduling guaranteeing a minimum throughput to the flows traversing the WMN. However, none of the existing works address the problem of computing a schedule that guarantees that pre-specified end-to-end delay constraints are met. In this paper, we make a first step forward in this direction by defining a link scheduling algorithm that works in sink-tree WMNs, i.e. those whose traffic is routed towards a common sink (i.e. the Internet gateway). Our iterative algorithm exploits a delay-based admission control procedure, devised through Network Calculus, which solves an optimization problem and tests the feasibility of a schedule from the point of view of delay guarantees. Thanks to a clever solution approach for the optimization problem, the iterative algorithm computes feasible solutions in affordable times for networks of several tens of nodes, and is thus amenable to online admission control of real-time traffic.     

无线传感器网络的网络管理

无线传感器网络是由许多能量和处理能力有限的传感器节点组成.传感器网络主要用来监测环境、建筑和结构和动物习性的监测.网络管理是任何网络,包括传感器网络的重要功能.而由于无线传感器网络的特点,对其管理要比传统网络都要困难,而其中网络管理的最主要方面是网络拓扑结构的管理.开发节能并且能够维护网络连接的拓扑的算法是非常必要的.本文介绍了网络管理的基本知识,以及如何应用在无线传感器网络中.文中主要描述了网络的拓扑结构,并且对现在主要的网络拓扑结构算法进行描述和比较.     

A quality based routing protocol for wireless mesh networks

Wireless mesh networks can provide low-cost solutions for extending the reach of wireless access points by using multi-hop routing over a set of stationary wireless routers. The routing protocol for these networks may need to address quality considerations to meet the requirements of the user. In this paper, we present a quality based routing protocol for wireless mesh networks that tries to maximize the probability of successful transmissions while minimizing the end-to-end delay. The proposed routing protocol uses reactive route discoveries to collect key parameters from candidate routes to estimate the probability of success and delay of data packets transmitted over them. To achieve accurate route quality assessments, a new route quality metric is proposed that uses performance models of data packet transmissions as opposed to estimating route quality from the transmission of control packets, which have different transmission characteristics. These models are developed after careful evaluations of multi-hop wireless transmissions and validated by computer simulations. Relevant parameters that can be used to assess the route quality metric using these models are explained. Extensive performance evaluations of the proposed quality based routing protocol are presented and its benefits in comparison to some other known routing protocols are discussed.     

SINR下基于PNC的无线网络容量研究

物理层网络编码（PNC）作为网络编码的延伸,可以通过降低无线网络节点的干扰提升无线网络的容量。在协议干扰模型下研究基于PNC无线网络的容量增益,只考虑发送节点临近的一个节点的影响,没有考虑全局节点的影响,且参数[Δ]单一、抽象,不能良好表达真实网络环境。针对这些缺点,提出一种物理干扰模型（SINR）下基于PNC的无线网络容量的评测方法。在试验仿真结果中,证实全局节点影响下PNC方案无线网络容量在SINR各参数下的性能指标优于其他编码方案,并给出所有参数下网络容量的上界以及容量上界随参数变化特性。