无线传感器网络中一种能量有效的混合式拓扑控制算法

与AdHoc网络不同,无线传感器网络以降低节点的能耗作为首要的设计目标.针对节点能量有限的特点,提出一种能量有效的混合式拓扑控制算法--EAHTC算法.该算法优先选择剩余能量高的节点担任簇头节点,而且算法采用局部信息,动态调节节点通信范围,改变一跳可达邻居数量,从而减轻MAC层负担达到节能的目的.同时在网络运行过程中,算法通过周期性重新选举簇头,减小并均衡网络中节点的能耗,从而进一步延长了网络的生存期.仿真结果验证了该算法的有效性.     

基于行车参数信息的车联网网络分割解决方法

首先对车联网网络分割的判定方法、发生网络分割的可能性进行了分析。在分析的基础上,为了解决车联网中由于网络拓扑结构的动态变化引起的网络分割的问题,提出了一种基于行车参数信息的车联网网络分割解决方法。方法利用GPS定位装置提供的行车参数信息,对网络分割解决过程中目标节点的移动轨迹进行了预测并对目标节点位置进行修正。仿真结果表明该方法有效降低了网络端到端的延时,提高了网络分割修复成功率和分组转发成功率。     

基于位置信息的车联网路由恢复方法

利用方向性天线的高空间复用度和高传输能力,提出了一种基于位置信息的车联网路由恢复方法。为了减少路由修复过程中因目标节点移动对路由修复造成的影响,方法利用GSP定位装置提供的行车参数信息,对路由修复过程中目标节点的移动轨迹进行了预测并对目标节点位置进行修正。仿真实验表明:方法有效提高了路由修复成功率、降低了路由修复延迟和路由修复开销。     

基于城市配电网的无线自组传感器网络结构研究

数据通信是变配电自动化系统不可或缺的重要组成部分.在10kV以下的电力系统中,对电网数据的采集、处理、显示和控制尚无统一的通信组网模式.运用图论的方法分析城市配电网架构模式,提出一种基于改进的Dijkstra最短路径算法的无线自组传感器网络路南算法,在仿真结果的理论依据上实现了无线传感器节点的合理部署,使得无线自组传感...     

无线网络在变电站自动化中应用

ad hoc网络是一种没有控制中心、无需预设网络设施的多跳无线网络。同传统有中心网络相比,ad hoc网络具有安装简单、组网灵活、健壮性等特点。正被广泛应用到许多领域。介绍了ad hoc网络的特点。提出了一种基于ad hoc网络技术的变电站无线网络方案,论述无线ad hoc网络应用于变电站自动化系统的可行性,描述了变电站ad hoc无线网络的网络结构及其路由协议的使用。该设计可作为现有变电站通信网络的补充,扩展现有通信网络的功能。提高变电站自动化通信水平。     

A novel distributed algorithm for media access control address assignment in wireless sensor networks

This paper presents a novel distributed media access control (MAC) address assignment algorithm, namely virtual grid spatial reusing (VGSR), for wireless sensor networks, which reduces the size of the MAC address efficiently on the basis of both the spatial reuse of MAC address and the mapping of geographical position. By adjusting the communication range of sensor nodes, VGSR algorithm can minimize the size of MAC address and meanwhile guarantee the connectivity of the sensor network. Theoretical analysis and experimental results show that VGSR algorithm is not only of low energy cost, but also scales well with the network size, with its performance superior to that of other existing algorithms. __________ Translated from Journal of Xidian University, 2006, 33(5): 716–720 [译自: 西安电子科技大学学报 (自然科学版)]     

A distributed Synchronous reservation multiple access control protocol for mobile Ad hoc networks

This study proposes a new multiple access control protocol named distributed synchronous reservation multiple access control protocol, in which the hidden and exposed terminal problems are solved, and the quality of service (QoS) requirements for real-time traffic are guaranteed. The protocol is founded on time division multiplex address and a different type of traffic is assigned to different priority, according to which a node should compete for and reserve the free slots in a different method. Moreover, there is a reservation acknowledgement process before data transmit in each reserved slot, so that the intruded terminal problem is solved. The throughput and average packets drop probability of this protocol are analyzed and simulated in a fully connected network, the results of which indicate that this protocol is efficient enough to support the real-time traffic, and it is more suitable to MANETs. Translated from Journal of Xidian University, 2006, 33(1): 28–32 [译自: 西安电子科技大学学报]     

An efficient method for network topology identification based on an SOM algorithm

In this paper we consider a large number of wireless terminals that are interconnected by a multihop wireless network called an ad hoc network. Design of routing protocols is a crucial problem in ad hoc networks. Location information of wireless terminals is an effective measure for ad hoc network routing. This paper presents a method to identify network topology implying terminal location and connections among terminals. A modified Self‐Organizing Map (SOM) algorithm is proposed to apply to the network topology identification. This method exploits information of the received power levels of the signals that are transmitted by other terminals. This paper has evaluated how network topology is identified by means of an example graph made by random numbers. The results show that only one bit information about the received power level in each terminal can identify network topology accurately with a mean error of about 10% for more terminals than a certain value. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 142(4): 34–44, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10100     

无线传感器网络虚拟力覆盖控制及节能优化研究

综合考虑无线传感器网络的能量约束、覆盖要求,结合天线理论,将无线传感器网络的覆盖控制问题归结于一个多目标非线性规划问题,从而推导并建立了一个多目标非线性规划问题的数学模型。解决方法上,提出了一种基于节能的虚拟力优化算法。将传感器节点与目标覆盖区域的虚拟力操作和节点之间的虚拟力操作按节约能耗的约束同时进行,从而达到覆盖控制技术的优化目的。仿真实验表明,该策略对解决多目标非线性规划问题有着良好的收敛性与普适性,可以满足无线传感器网络的覆盖控制要求,并可以将网络的生命周期最大化,提高了系统的性能。     

一种快速可靠的无线传感器网络路由

针对无线传感器网络的特点,本文提出了一种快速可靠的无线传感器网络路由,采用建立网络树结构方式,使各节点拥有唯一的传输路径,降低网络延迟,减少能量消耗。该路由对硬件无特别要求,仅采用普通射频芯片即可以同时工作于任务查询方式及事件驱动方式,并具有较强的路径自我修复能力。算法通过软件仿真并与经典的路由协议Directed Diffusion做多方面比较,结果表明,该路由具有更好的性能,兼备低延迟,低功耗、鲁棒性强及易实现等特点。     

A distributed routing algorithm for data aggregation in wireless sensor networks

Considering the impact of aggregation cost on the performance of aggregation routes in wireless sensor networks, an aggregation-decision-based distributed routing algorithm for data aggregation is proposed. When source nodes arrive or leave, the algorithm can calculate the aggregation benefit according to data correlation, aggregation cost and transmission cost. Then the algorithm will adaptively make aggregation and routing decisions based on aggregation benefit. Therefore, it can jointly optimize the aggregation and transmission costs and reduce the energy consumption for data gathering. This distributed algorithm makes all the decisions only relying on the local information. Hence, the routing maintenance cost is limited. Simulation results show that the energy consumption difference between this distributed online algorithm and the previous offline one is within 17% under any network conditions. __________ Translated from Journal of Beijing University of Posts and Telecommunications, 2007, 30(1): 9–13 [译自: 北京邮电大学学报]     

一种分布式车联网路由恢复方法

针对移动自组网路由协议在用于车联网时路由恢复延迟长、效果差的问题,提出了一种独立于具体路由协议的路由恢复方法。主要用于高速公路无基站情况下车与车之间的通信。能在通信路径断开后快速恢复并保证恢复后的通信路径有较高的可靠性。仿真实验表明,算法有效地降低了路由恢复延迟和开销,提高了路由修复成功率和路径生存时间。     

"小世界"无线传感器网络的最佳近邻节点数

为了进一步降低"小世界"无线传感器网络的平均路径长度,以节省更多的能量,本文基于"小世界"传感器网络模型研究了传感器节点的最佳近邻节点数.研究表明,给定传感器网络节点数和重连概率后,当网络的近邻节点数取合适的值时,平均路径长度还将进一步降低.继续增大近邻节点数则网络平均路径长度变化不大.因此,出于节能考虑,提出了最佳的"小世界"传感器网络中的近邻节点数.利用复杂网络的小世界网络效应探讨了无线传感器网络的近邻节点数.研究表明,适当调整无线传感器网络的近邻节点数,不但仍然能够保持无线传感器网络的小世界效应,还可以使无线传感器网络的平均路径长度进一步降低.     

无线传感器网络定位技术综述

首先介绍无线传感器网络定位技术的相关术语、评价标准等基本概念及定位算法的分类方法;重点从基于测距和非测距两个方面介绍无线传感器网络的主要定位方法,并研究和分析若干新型无线传感器网络定位方法,主要包括基于移动锚节点的定位算法、三维定位算法和智能定位算法。从实用性、应用环境、硬件条件、供能及安全隐私等方面出发总结当前无线传感器网络定位技术存在问题并给出可行的解决方案后,展望未来的研究前景与应用发展趋势。     

用于土壤湿度测量的传感器网络动态采样策略

土壤湿度是科研及生产生活等众多领域的测量要求。传感器连续采样方式能耗大、维护困难,不适用于无线传感器网络领域。本文提出一种适用于无线传感器网络土壤湿度测量的新型动态采样控制策略,将土壤湿度量化为马尔可夫过程,利用部分可观察马尔可夫决策问题,通过动态远程控制传感器节点的采样周期,以较少的采样点满足测量需求,达到节省能量的目标。实验结果表明,动态采样控制的采样时间及总体成本分别只有传统连续采样模式的13%和62%。本策略可以广泛应用于其他环境量测量领域,如气温,水质,环境湿度等量的测量。     

一种能量均衡的无线传感器网络分簇算法

本文基于优化理论求簇首优化解,使整个网络的能量按照分簇达到均衡,极大地提高了节点的能量利用率和网络寿命.仿真结果显示,该算法使网络的寿命提高了10%～25%.     

无线传感器网络抗Sybil攻击的MPRR-RSSI定位算法

无线传感器网络技术近年来发展非常迅猛,然而实际通信环境非常复杂,而且充满攻击和对抗,网络节点的正确位置信息是构建系统、维护网络、目标跟踪和事件定位等关键技术实现的基础,定位的安全性至关重要。着重研究了基于接收信号强度指示(RSSI)原理抗女巫攻击的无线传感网络安全定位系统的编码技术和定位方法,并对相关算法进行了仿真分析。通过结果可知,改进后的编码和定位算法结构相对简单,对系统的硬件依赖小,抗攻击能力提高。     

Continuum modeling of large networks

This paper is concerned with the modeling and simulation of extremely large networks. We derive a time‐dependent diffusion–convection partial differential equation, the solution of which captures the global characteristics of a stochastic network model. Continuum modeling provides a powerful way to deal with the number of components in large networks and opens up the use of highly sophisticated mathematical tools such as adaptive finite element methods. This, in turn, makes it possible to carry out—with reasonable computational burden even for very large systems—network performance evaluation and prototyping, network design, systematic parameter studies, and optimization of network characteristics. Copyright © 2007 John Wiley & Sons, Ltd.     

无线纳米传感器网络高节能编码方案

随着近年来纳米技术的快速发展,制造纳米级大小的传感器节点将变得实际可行。由纳米传感器节点组成的无线纳米传感器网络有着诸多非常重要的应用,比如体内释药系统、空气污染监测等。由于纳米电池所能携带的电量极其有限,节能是其通信技术设计的最重要目标之一。针对采用键控开关调制的无线纳米传感器网络,研究设计综合考虑发送能耗和接收能耗的通信能耗最小化编码方案,首先将该编码设计问题建模为整数规划问题,然后通过求解该优化问题得到最优编码方案。性能分析结果表明,该编码方案可以有效地节省纳米传感器的通信能量消耗。