共查询到20条相似文献,搜索用时 156 毫秒
1.
2.
无线体域网络比传统传感网络要求更高的数据传输可靠性和及时性,其可靠性属于数据包级可靠。提出了一种及时可靠的无线体域网络传输协议,该协议考虑到节点的存储资源受限和无线体域网络数据优先级,采用E2E(End-To-End)、HBH(Hop-By-Hop)以及E2E与HBH相结合的错误恢复机制保证数据传输的可靠性。首先在每个节点缓存优先级别最高的警报信息,提供HBH错误恢复;其次通过在当前节点位置为接收信号强度RSSI较低的后一级节点缓存优先级别较高的数据包,提供E2E与HBH相结合的错误恢复;最后对低优先级数据采取E2E错误恢复。性能分析与模拟实验表明:该协议在数据传输率、端到端延迟和能量消耗等方面优于相似协议MAODV-SIM。 相似文献
3.
4.
多媒体传感器网络中基于两跳簇结构的图像传输方案 总被引:3,自引:0,他引:3
与传统无线传感器网络节点能量绝大部分消耗在无线收发上不同,无线多媒体传感器网络中数据处理与传输能耗具有“均匀“分布的特点.通过分析表明,传统无线传感器网络簇结构下的数据传输策略并不适合于无线多媒体传感器网络.因此提出了一种基于两跳簇结构的图像传输方案,通过增加中继节点负责图像的压缩编码和转发,在减小相机节点图像传输能耗的同时,大大缓解了相机节点和簇头的图像处理能耗压力.仿真结果表明,该图像传输方案极大的延长了网络的生命周期,非常适合于能量有限的无线多媒体传感器网络. 相似文献
5.
6.
基于双MCU和nRF2401的无线传感器网络系统 总被引:1,自引:0,他引:1
基于无线传感器网络的理论和实现研究,提出了无线传感器网络系统.该系统由3个传感器节点和1个Sink节点组成.传感器节点采用MSP430F123单片机为处理器;Sink节点采用S3C2410为处理器,两者的无线传输模块均采用nRF2401芯片.经调试运行,该系统实现了小规模地区内温度信号的采集、传输和处理.运行结果表明,该系统可以作为无线传感器网络的实验系统,为无线传感器网络的研究提供实验平台. 相似文献
7.
利用无线传感器网络传输RFID数据的研究 总被引:3,自引:1,他引:2
穆兰 《计算机测量与控制》2010,18(10)
利用无线传感器网络高可靠性、低成本、低复杂度的特点,实现了一个UHF RFID数据传输网络;首先介绍了UHF RFID系统和无线传感器网络的结构;采用高性能的无线单片机CC2430,通过建立和维护设备地址映射表,来实现一个无线串口网络;测试了无线串口网络传输的性能;结果显示,无线传感器网络是一个性价比很高的UHF RFID数据传输手段,是对有线传输很好的补充. 相似文献
8.
苏洪静 《网络安全技术与应用》2014,(12):151-152
无线传感器网络(WSN)涉及了数据感知采集、嵌入式计算处理、无线通信传输、安全传输等多种技术领域.当前被广泛应用于军事、环境、医疗保健、工业制造等社会各个方面。本文以无线传感器网络的构成结构、节点特征为基础,简单介绍其中若干关键安全技术。 相似文献
9.
在搭建交通隧道无线传感器网络( WSNs)模型的基础上,分析交通隧道无线信号的传输特性。运用经典的Ad-Hoc路由协议构造仿真场景,从描述图像质量的平均峰值信噪比( PSNR)值和描述网络质量的平均时延两个方面分析交通隧道中无线传感器网络传输视频图像的性能。研究表明:使用基于Ad-Hoc路由协议的传感器网络传输视频图像可以满足交通隧道监控的要求,按需距离矢量路由( AODV)协议传输的视频图像质量优于目的序列距离矢量路由( DSDV)协议。 相似文献
10.
无线多媒体传感器网络( WMSNs)节点存在功耗大、体积大和抗损毁性差等问题,且不适合大规模使用。该研究围绕WMSNs节点的关键技术展开研究,设计并实现了一个图像数据无线传输的低功耗、高效率的系统,该系统采用三层网络结构进行图像数据无线传输,构造了性能优化、结构优良的WMSNs,以此解决了WMSNs的图像传输关键问题。在搭建的开发与测试环境中,完成了节点通信距离的测试和节点功耗测试。测试结果表明:该测试平台性能良好,能够实现图像数据的可靠传输。该研究为WMSNs图像数据传输系统设计提供研究基础和思路。 相似文献
11.
Many Internet multicast applications such as teleconferencing and remote diagnosis have Quality-of-Service (QoS) requirements. The requirements can be additive (end-to-end delay), multiplicative (loss rate), or of a bottleneck nature (bandwidth). Given such diverse requirements, it is a challenging task to build QoS-constrained multicast trees in a large network where no global network state is available. This paper proposes a scalable QoS multicast routing protocol (SoMR) that supports all three QoS requirement types. SoMR is scalable due to small communication overhead. It achieves favorable tradeoff between routing performance and routing overhead by carefully selecting the network sub-graph in which it searches for a path that can support the QoS requirements. The scope of search is automatically tuned based on the current network conditions. An early-warning mechanism helps detect and route around the long-delay paths in the network. The operations of SoMR are completely decentralized. They rely only on the local state stored at each router. 相似文献
12.
《Computer Networks and ISDN Systems #》1998,29(17-18):2119-2138
With the introduction of diverse rate requirements under a variety of statistical multiplexing schemes, traffic burstiness behavior of a source stream and its quality-of-service (QoS) performances within the ATM networks become difficult to model and analyze. In this paper, we address this issue and propose a rate-controlled service discipline that provides control of the traffic burstiness while maintaining QoS guarantees for traffic flows with various rate requirements. According to our analysis, traffic streams from different connections can be well regulated at the output of each network node based on their rate requirements. Traffic envelope and the associated burstiness behavior inside the network can thus be effectively characterized. In addition, by assuming a leaky-bucket constrained input source, we prove that the proposed scheme can provide end-to-end delay and jitter bounds for each connection passing through a multi-hop network. Further, due to the low traffic burstiness, only a small buffer space is required at the internal switches for guaranteeing QoS requirements. 相似文献
13.
14.
15.
16.
针对MANET中QoS需求与隐藏终端等问题,提出了一种基于移动预测的单向QoS路由协议,该协议充分利用网络中存在的单向链路,采用移动预测机制,通过选取满足QoS条件的最稳路径的方式为数据流选择最佳路由,分析和实验结果表明,这种协议具有数据包传送成功概率高和控制开销低等优点,能有效支持单向MANET中具有QoS需求的多媒体信息传输。 相似文献
17.
Advances in networks during the past decades have fostered the deployment of a variety of Internet applications. Many of these applications have a range of Quality-of-Service (QoS) requirements, some involving network throughput, delay, and reliability. Consequently, there is growing need for network services that can differentiate applications having QoS requirements from those without and to be able to further classify applications with QoS requirements into different classes at the IP-network level. The Internet Engineering Task Force (IETF) has proposed Differentiated Services (DiffServ) to provide QoS in IP-based networks. The goal of DiffServ is to define configurable types of packet forwarding that can provide service differentiation for large aggregates of network traffic. We report on our investigation of Relative Proportional Differentiated Services to implement DiffServ in IP-based networks and one that supports the provisioning and management of QoS for Internet Applications. The main contributions of the paper are the introduction of a novel traffic conditioning architecture for the marker and shaper/policer which relies on feedback from a metering component, and the provision for a QoS manager to enable a network administrator or a management application to dynamically adjust control parameters. 相似文献
18.
A novel prediction technique to improve quality of service (QoS) for heterogeneous data traffic 总被引:2,自引:1,他引:1
The present and future high-speed networks are expected to support wide variety real-time applications. However, the current
Internet architecture offers mainly best-effort service. It means that the network will do its best to deliver the data at
the destination without any guarantee. But the future integrated services networks will require guarantee for transferring
heterogeneous data. There are many parameters involved in improving the Quality of Service (QoS). QoS is a set of service
requirements to be met by the network while transporting a flow. In this paper, we consider four primary parameters are such
as reliability, delay, jitter, bandwidth which together determine the QoS. The requirements of the above parameters will vary
from one application to another application. Applications like file transfer, remote login, etc., will require high reliability.
But, applications like audio, video, etc., will require low reliability, because they can tolerate errors. The objectives
of this paper are to propose a novel technique to predict reason(s) for deterioration in the QoS and to identify the algorithm(s)/mechanism(s)
responsible for the deterioration. We are sure that this paper will give better results to improve the QoS and to improve
the performance of the network. 相似文献
19.
Chenn-Jung Huang Yi-Ta Chuang Kai-Wen Hu 《Engineering Applications of Artificial Intelligence》2009,22(8):1188-1193
A mobile ad hoc network (MANET) is a collection of self-organized mobile nodes that are capable of communicating with each other without the aid of any established infrastructure or centralized administration. Multicasting plays a very important role in the application of ad hoc networks. As the number of participants increases, scalability of the multicast protocol becomes an important issue. When considering the increasing demand of Quality-of-Service (QoS) requirements in many applications, the existing multicast routing protocols used for ad-hoc network should be adapted appropriately to effectively meet the stringent QoS requirements of specific multimedia traffic. We thus propose a multicast routing protocol which tries its best to meet the variation of behavior of network topology and satisfy QoS requirements of specific multimedia traffic using particle swam optimization (PSO) in the volatile environments of a MANET. Meanwhile, a priority scheduler with PSO is also proposed to make scheduling decisions so that the packet loss rate can be further reduced. The results of a series of simulations exhibit the practicability and feasibility of our protocol. 相似文献