面向普适健康服务的无线体域传感网

面向普适健康服务的无线体域传感网要求网络满足高速、低功耗的要求。通过采用超宽带技术,结合普适健康服务业务需求,构建了高速、低功耗的无线体域传感网。该网络能够支持多种传感器同时检测,通过高速物理层接口,做到生理信息的及时传输。实际原型系统测试表明:该原型系统能够支持10个以上节点,在3 m范围内提供100 Mbps的网络速率,并且发送节点平均功耗小于10 mW。     

及时可靠的无线体域网络协议研究

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。     

基于多态蚁群算法的WSN能耗均衡路由协议

针对无线传感器网络（WSN）的能耗均衡问题,提出一种基于多态蚁群算法的路由协议,采用周期传输和数据融合的方式,将无线传感器节点的剩余能量信息融合到信息素的形成中。仿真实验表明,与Leach协议相比,采用该协议有82％的节点生命周期更长,在相同时间内网络可多传输48％的数据包。在实验室使用31个节点部署无线传感器网络,将路由协议应用于网络。实验结果验证了该协议的有效性。     

多媒体传感器网络中基于两跳簇结构的图像传输方案

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.     

基于网络编码的ECC验证方案在WSN中的研究

网络编码在无线传感器网络应用,改善了无线传感器网络的性能。虽然与之前相比,其安全性有所提高,但当面临安全攻击（被动攻击和主动攻击）时,整个网络系统的安全性仍然亟待提高。提出了一种改进方案,该方案结合密码学中椭圆曲线加密算法,并基于应用网络编码的无线传感器网络,采用加密验证方案。使传感器节点在电量受限的情况下,传输更多的有效数据。同时,增强了无线传感器网络节点之间通信的安全性,以及WSN其鲁棒性和容错性。     

基于双MCU和nRF2401的无线传感器网络系统

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.     

利用无线传感器网络传输RFID数据的研究

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.     

浅析无线传感器网络安全技术

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。     

基于Ad-Hoc的交通隧道无线传感器网络视频传输研究

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。     

无线充电传感器网络能量效率优化研究

本文将SWIPT技术应用到无线充电传感器网络中,提出了一种基于SWIPT的协作传输协议（简称CTS）,利用无线信息和能量的协作传输来提高无线能量传输的效率。在此基础上,设计了一个以最大化网络效用为目的的资源分配策略优化问题,并提出RAPOA算法来求解问题。仿真实验表明CTS最大化了网络效用,提高了无线充电传感器网络的能量传输效率。     

SoMR: A scalable distributed QoS multicast routing protocol

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.     

Providing traffic smoothness and service guarantees within ATM networks through a rate-controlled service discipline

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.     

一种基于DPSO的无线传感器网络QoS路由算法

针对无线传感器网络中不同业务对服务质量(QoS)的不同需求,提出一种基于离散粒子群优化(DPSO)的无线传感器网络QoS路由(DPSO-QR)算法。算法将路由建立过程抽象为多目标优化过程,以节点间通信的传播损耗、时延、带宽、丢包率为优化目标,利用DPSO算法实现多目标优化,为拥有不同QoS需求的网络业务提供满足其特有需求的优化路由。仿真实验表明:与SAR,EQR算法相比,DPSO-QR算法降低了网络平均端到端时延,减小了丢包率,延长了网络寿命。     

煤矿综合网络服务质量模型

煤矿企业综合网络难以满足各种业务对服务质量的要求。在分析煤矿网络业务特点的基础上,借鉴服务质量控制思想,提出一种解决煤矿综合网络服务质量问题的模型,研究煤矿综合网络中业务等级划分的方法,探讨适用于煤矿网络的队列管理算法和分组调度算法。仿真结果表明,在大数据量传输时,该模型能有效提高煤矿综合网络的服务质量。     

新一代网络QoS研究

随着网络技术和应用的飞速发展,互联网的接入形式以及网络应用日益呈现出复杂、异构和泛在等特点,当前的网络已经暴露出诸多不足,在很多方面无法满足用户对服务质量(QoS)的要求.当前互联网的QoS体系结构及相关技术已经不能适应新一代网络应用的进一步发展.文章着眼于未来互联网的发展方向,从网络QoS体系结构、实时QoS保证、融合QoP的QoS控制以及QoS性能评价理论等几个方面论述新一代网络QoS面临的挑战和解决思路,探讨了新一代网络QoS的发展方向.     

MANET中一种基于移动预测的单向QoS路由

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。     

Managing Quality-of-Service in Internet Applications Using Differentiated Services

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.     

A novel prediction technique to improve quality of service (QoS) for heterogeneous data traffic

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.     

Using particle swam optimization for QoS in ad-hoc multicast

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.     

基于Parlay APIs的QoS能力提供技术

针对支撑现代服务业的异构融合通信网络适配层对QoS能力的要求,设计基于Parlay APIs的QoS SCF接口,分析该接口在现代服务业中的应用。给出的QoS SCF接口能够保障网络切换时业务的连续性,实时反馈网络的资源使用状况,支持用户对QoS的偏好设置。仿真结果表明了该接口的功能实现。当网络负载较大时,在保证正常运行情况下,QoS SCF可以使业务吞吐量提高近50％。