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1.
针对实际应用中无线传感器网络多区域分布、任务多元化的特点,为解决簇间通信的相互干扰,提出一种改进的FDMA/TDMA混合机制的无线传感器网络。簇间采用FDMA避免干扰,簇内节点采用TDMA实现睡眠调度。此外,在TDMA机制中分配监测时隙,如有突发情况,簇内节点可通过CSMA竞争与簇头节点实现通信,以此增加上报的公平性。对网络系统进行了工程实现验证,测试证明达到预期效果。  相似文献   

2.
针对无线传感器网络节点能量受限制问题,提出一种节能网络,把监测环境中通电电缆的磁能转化为电能,实现节点能量的自给。采集的能量采用双边调谐阻抗网络传输,通过设计原副边回路参数,令其回路发生谐振来降低自身损耗;组网模式上,用节能静态网络模型代替能耗大的动态组网方式,结合需要,通过切换节点的工作方式来降低能耗。实验证明,能量采集模块一个工作周期采集的能量为10.93 mJ,能够满足传感网络节点工作周期的最大能耗4.68 mJ,验证了节能传感网络可以实现能量自給。  相似文献   

3.
毫米波技术和无线传感器网络是目前各国研究的热点。随着毫米波器件的发展,使得其应用于无线传感器网络成为可能。从国内外公开发表的文献资料来看,这项应用虽然不甚成熟,但是其发展潜力巨大,有很多复杂问题有待研究解决。简要阐述了毫米波通信技术在无线传感器网络,特别是军用无线传感器网络中应用所具有的优势,对需要进一步解决的问题进行了研究分析。  相似文献   

4.
针对无线传感器网络数据采集系统中的提升数据吞吐能力、传输可靠性,文章提出了一种基于数据包协调的时分媒体接入协议,vaTDMA。通过节点间小体积数据包交互,分配节点信道接入时机。规避传统TDMA中传输时隙的必要冗余,并将其集中于采样周期的尾端,增加了数据包传输机会;通过重传算法提高传输可靠性。实验结果表明,文章提出的无线传感器网络通讯协议的有效性。  相似文献   

5.
一种基于Zigbee的无线传感器网络教学实验系统   总被引:3,自引:0,他引:3  
本文首先简要介绍无线传感器网络的体系结构,然后给出一个基于IEEE802.15.4和Zigbee协议的无线传感器网络教学实验系统。该系统中的多个传感器节点可以组成多种不同的拓扑结构,并可以将采集到的数据通过GSM网络发送到用户终端,用户也可以通过GSM网络对远程传感器节点进行控制。该教学实验系统已被许多院校采用,亦可直接应用于其他领域。  相似文献   

6.
一种无线传感器网络的多Agent系统模型   总被引:5,自引:1,他引:5  
陈志  王汝传  孙力娟 《电子学报》2007,35(2):240-243
针对无线传感器网络缺乏普遍的理论模型,提出一种多Agent系统模型,包括形式化语言、模型、语义以及相应的公理和模型约束.该模型将无线传感器网络抽象为由具有特定信念、期望、意图和能力等认知成分的Agent组成的认知系统,所有这些认知成分构成多Agent系统认知模型.本文将为独立于内部结构和具体实现来理解、分析和预测无线传感器网络行为提供形式化的理论基础和分析工具.  相似文献   

7.
提出了把无线传感器应用于火险信息检测防治的思路,研究设计了基于无线传感器网络的火险信息采集系统。节点设计基于MSP430单片机和CC2420 ZigBee射频IC。采用ARM7系列S3C44BOX、GPRS模块SIM100的网关设计,搭建了平面型无线信息传输网络拓扑结构,仿真结果表明,网络伸缩性好,当发生火灾导致某些传感器节点被烧毁时,网络的其他部分还能持续正常工作,具有自组织重新恢复网络的功能。该系统能够实时地显示出各节点的温度、湿度和风速参数,实现楼宇范围火险信息的实时采集。  相似文献   

8.
军事防御、灾害监测与救援等危险/恶劣环境监测是无线传感器网络的典型应用。在此面向危险/恶劣环境监测需求,设计并构建移动多Sink无线传感器网络监测系统,实现环境信息感知、便携式移动指挥、事件定位、移动用户生理监护、多模态(语音、图像、文字等)交互等功能。实验测试结果表明,当网络中存在2个移动Sink节点时,网络平均延时小于100 ms,网络丢包率小于6%,可满足网络实时性要求不高的应用。  相似文献   

9.
无线传感器网络广泛地应用于环境监测、安全交通、智慧农业、燃气监测、智能家居、甚至军事领域。而在这些应用领域中,以温度、湿度、压力等技术指标最为常用,本文主要介绍一种集成了温度、湿度、压力三个物理量的无线复合式传感器网络的设计。  相似文献   

10.
本文介绍了一种无线传感器网络节点的设计,详细讨论了传感器节点的硬件组成,电源特征和通信模式,并给出振动传感器的实验结果。由此节点组成的系统稳定性好,通信效率高。可用于环境状况及建筑物健康状况的远程监测。  相似文献   

11.
感测数据,再将数据传输至信宿是无线传感网络(WSNs)中节点的首要任务。传感节点由电池供电,它们的多数能量用于传输数据,越靠近信宿的节点,传输的数据量越大。因此,这些节点的能耗速度快,容易形成能量-空洞问题。而通过移动信宿收集数据能够缓解能量-空洞问题。为此,提出基于粒子群优化的信宿移动路径规划(PSO-RPS)算法。PSO-RPS算法结合数据传递时延和信息速率两项信息选择驻留点,并利用粒子群优化算法选择最优的驻留点,进而构建时延有效的信宿收集数据的路径。仿真结果表明,提出的PSO-RPS算法有效地控制路径长度,缩短了收集数据的时延。  相似文献   

12.
    
Recently, sink mobility has been shown to be highly beneficial in improving network lifetime in wireless sensor networks (WSNs). Numerous studies have exploited mobile sinks (MSs) to collect sensed data in order to improve energy efficiency and reduce WSN operational costs. However, there have been few studies on the effectiveness of MS operation on WSN closed operating cycles. Therefore, it is important to investigate how data is collected and how to plan the trajectory of the MS in order to gather data in time, reduce energy consumption, and improve WSN network lifetime. In this study, we combine two methods, the cluster‐head election algorithm and the MS trajectory optimization algorithm, to propose the optimal MS movement strategy. This study aims to provide a closed operating cycle for WSNs, by which the energy consumption and running time of a WSN is minimized during the cluster election and data gathering periods. Furthermore, our flexible MS movement scenarios achieve both a long network lifetime and an optimal MS schedule. The simulation results demonstrate that our proposed algorithm achieves better performance than other well‐known algorithms.  相似文献   

13.
卢先领  王莹莹 《通信学报》2014,35(10):107-116
在实时性要求比较高的应用中,时延要求限制了sink的移动速率与移动轨迹,sink的移动速率限制了节点与sink的通信时间,因此很难兼顾时延要求与数据收集效率。提出一种时延受限的移动sink数据收集算法MSDC,在低能耗缓存区内找到一条sink的最优移动轨迹,在有限的时间限制内利用sink的移动性来提升传感器网络的数据收集性能。仿真结果表明,与已有算法比较,该方案能够提高网络数据采集量,降低能耗,延长网络生命周期。  相似文献   

14.
The majority of the energy consumption by the sensors is the energy requirement for data transmission in Wireless Sensor Networks (WSNs). Therefore, introducing mobile collectors to collect data instead of multi-hop data relay is essential. However, for many proposed data gathering approaches, long data delay is the main problem. Hence, the problem of how to decrease the energy consumption and the data delay needs to be solved. In this paper, a low delay data collection mechanism using multiple mobile collectors is proposed. First, a self-organization clustering algorithm is designed. Second, sensor nodes are organized into three-level clusters. Then a collection strategy based on the hierarchical structure is proposed, which includes two rules to dispatch mobile collectors rationally. Simulation results show that the proposed mechanism is superior to other existing approaches in terms of the reduction in energy expenditure and the decrease in data delay.  相似文献   

15.
文章围绕引入移动节点可以节省无线传感器网络的能量消耗这一主题,对引入了移动节点的无线传感器网络的数据收集方式进行了一个全面合理的分类,并且结合相关文献对每类数据收集方式展开深入讨论,系统全面地论述了该主题的研究现状、存在的问题以及面临的挑战。  相似文献   

16.
    
The reduction of energy consumption in order to increase network lifetime is one of the most major challenges in the design of wireless sensor networks. During data dissemination, the sensors that are located in the sink's neighborhood are responsible to relay data to the other nodes; hence, their energy is exhausted expeditiously. Therefore, the idea of utilizing mobile sinks can be so advantageous to decrease energy consumption during data dissemination process. In this paper, we propose self‐managed grid‐based data disseminating protocol for mobile sink in wireless sensor networks by using the idea of constructing a virtual grid. In self‐managed grid‐based data disseminating protocol, sink and nodes map their geographical position to a virtual location. In order to increase the performance, we have employed a cell head for each grid cell. Cell heads are selected based on two parameters, centralization and residual energy. Our data dissemination protocol is simple and has low overhead to construct and maintain. Also, we have presented a new method for sink location update, which leads to the least cost in data transfer. Simulation results illustrate that by utilizing hierarchical functionality and determining an optimal size for grid cells, energy consumption is decreased, which leads to increasing network lifetime. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

17.
TTDD: Two-Tier Data Dissemination in Large-Scale Wireless Sensor Networks   总被引:4,自引:0,他引:4  
Sink mobility brings new challenges to data dissemination in large sensor networks. It suggests that information about each mobile sinks location be continuously propagated throughout the sensor field in order to keep all sensors informed of the direction of forwarding future data reports. Unfortunately, frequent location updates from multiple sinks can lead to both excessive drain of sensors limited battery supply and increased collisions in wireless transmissions. In this paper, we describe TTDD, a Two-Tier Data Dissemination approach that provides scalable and efficient data delivery to multiple, mobile sinks. Each data source in TTDD proactively constructs a grid structure, which enables mobile sinks to continuously receive data on the move by flooding queries within a local cell only. TTDDs design exploits the fact that sensors are stationary and location-aware to construct and maintain the grid infrastructure with low overhead. We evaluate TTDD through both analysis and extensive simulations. Our results show that TTDD handles sink mobility effectively with performance comparable with that of stationary sinks.  相似文献   

18.
徐佳  冯鑫  杨富贵  王传平  王汝传 《电子学报》2015,43(12):2470-2475
在基于移动sink传感器网络中,传感器节点能量受限,数据收集的能耗问题一直是研究的热点.通过建立最大化最小能耗概率模型,提出一种最大化最小能耗概率(Maximizing Minimum Probability of Energy Consumption,MMPEC)数据收集方法.MMPEC对网络中子节点与汇聚节点之间的路径长度进行分布式优化,使得整个网络的能耗达到最低的概率最大化.仿真结果表明,MMPEC在能耗方面优于同类基于移动sink的WSN分层数据收集方法.  相似文献   

19.
把"流量"的客观属性归纳为规模性、层次性、异质性和不可分性,揭示了流量巨大的潜在价值。基于电信运营商现有流量经营模式的分析,发现"面向手段性需求"、"无直接网络效应"和"边际成本下降有限"3大缺陷是流量经营价值困境的根源。在辨别"大数据"与"流量"内在联系的基础上,提出大数据经营模式并进行基于类比、场景勾画和理论分析的相关阐述,包括电信运营商和OTT在内的大数据经营者们,将经历消费平台、垂直平台和公共平台3个演化阶段,最终成为大数据公共平台运营商。最后,对电信运营商向大数据经营转型提出一些建议。  相似文献   

20.
张超 《移动通信》2014,(18):27-32
介绍了手机无线勘察系统的体系结构,重点从智能手机和勘察工作相结合的难点出发,深入到勘察流程、采集内容、数据获取呈现等方面,分析和研究了手机无线勘察系统的功能,从而提高勘察工作效率。  相似文献   

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