无源感知网络中能耗和延迟平衡的机会路由协议

部署于野外的感知网络在应用时广泛存在节点能量不足的问题,而新型的使用能量收集技术的节点可以通过周期性地从环境中获取能量来延长网络的生存周期.因此,针对使用能量收集型节点的无源感知网络,能耗不再像有源节点网络那样成为制约网络性能最关键的因素.综合考虑能耗和延迟,可以在使节点获得较长生存周期的同时提高数据到达基站的速度.针对现有应用于无源感知网络的路由协议大多不能兼顾能耗和延迟性能的问题,提出了能耗和延迟平衡的机会路由协议(balance of energy and delay opportunistic routing protocol,简称 EDOR).该协议通过分析节点通信过程来估算节点的预期能耗值,使得节点选择令自己能耗较低的邻居节点作为转发候选.在最终确定转发节点时,该协议通过结合候选节点下一跳邻居节点的占空比信息来进行决策,使得发送节点选择能够更快将数据转发出去的候选节点来降低延迟,从而实现能耗和延迟性能的平衡.最后,该协议还通过设计退避策略来实现转发节点的单一性,减少机会路由过程中产生的不必要的数据包副本数量.

无源感知网络在物联网中的应用探讨

物联网作为信息系统,已经被称为继计算机和互联网之后的世界信息产业的第三次浪潮,正在深刻地改变人类的生存环境和生活方式,但没有网络连接的支撑物联网将功能全失。本文探讨的无源感知网络就是最大限度地确保连接畅通,使物联网系统持续发挥作用。文章介绍了物联网现状、无源网络的特点、无源网络发展遇到的技术挑战,分析了为确保网络连接畅通需要解决的主要科技难题。为未来无源感知网络技术发展指出了方向,现实意义巨大。

基于无源感知网络的图书馆图书导航和排架系统分析与设计

随着高校图书馆图书数量的增加和馆藏面积的增大,如何快速找到所需图书资源,成为图书馆提高服务效率需要解决的首要问题。对基于无源感知网络的图书馆图书导航和排架系统进行分析与设计,并分析系统实现的机制。该系统在图书馆中的应用,可以提高图书资源的利用率,减轻馆员的工作量,提高读者查找图书资源的效率,提高图书馆服务的质量和效率。

无源感知网络中采用动态分片的IPv6数据包传递方案

在无源感知网络(PSN)中,基于网络编码的IPv6包传递方案大多采用固定的分片个数,传输时延较高。为此,考虑到无源传感器节点的特性,提出一种适用于PSN的IPv6包传递方案IPDS-DF。基于偏移正交相移键控调制方式的误码率模型,推导出无线链路的成功传输概率,进而得出每跳的平均传输时延、平均能耗和端到端数据包递交率。以最小化每跳的传输时延为目标,对传输路径上每个节点所采用的分片个数进行动态优化。实验结果表明,IPDS-DF的平均传输时延和能耗均低于现有IPv6包传递方案。

基于NAK的WISP数据传输方案

无线识别感知平台(Wireless Identification and Sensing Platform,WISP)可以从RFID(Radio Frequency Identification)阅读器发射的超高频信号中获取能量,为其内置低功耗微控制器和传感器供电,将传感器采集的数据传递到阅读器。提出基于否定应答(Negative Acknowledgement,NAK)的数据传输方案,可以克服WISP因传递的数据包重复比率太高而浪费信道这一弊端。实验结果表明:所提方案可以有效地降低数据包的重复比率,提高有效吞吐率。

Simplified Echo-State-Network Based Services Awareness for High-Speed Passive Optical Network

With the challenge from services diversity grows greatly,the service-oriented supporting ability is required to current high-speed passive optical network(PON) .Aimed to enhance the quality of service(Qo S) brought by diversified-services,this paper proposes an Simplified Echo State Network(SESN) Based Services Awareness scheme in High-Speed PON(Passive Optical Network) .In this proposed scheme,the ring topology is adopted in the reservoir of SESN to reduce the complexity of original Echo State Network,and system dynamics equation is introduced to keep the accuracy of SESN.According to the network architecture of 10G-EPON,a SESN Master is running in the OLT and a number of SESN Agents work in ONUs.The SESN Master plays the main function of service-awareness from the total view of various kinds services in 10G-EPON system,by fully SESN training.Then,the reservoir information of well-trained SESN in OLT will be broadcasted to all ONUs and those SESN Agents working in ONUs are allowed to conducts independent service-awareness function.Thus,resources allocation and transport policy are both determined just only in ONUs.Simulation results show that the proposed mechanism is able to better supporting ability for multiple services.

Echo-state-network classification based multi-services awareness in high-speed optical passive networks

With the challenge of great growing of services diversity,service-oriented supporting ability is required by current high-speed passive optical network( PON). Aimed at enhancing the quality of service( Qo S) brought by diversified-services,this study proposes an echo state network( ESN)based multi-service awareness mechanism in 10-Gigabite ethernet passive optical network( 10GEPON). In the proposed approach,distributed architecture is adopted to realize this ESN based multi-service awareness. According to the network architecture of 10G-EPON,where a main ESN is running in OLT and a number of ESN agents works in ONUs. The main-ESN plays the main function of service-awareness from the total view of various kinds of services in 10G-EPON system,by full ESN training. Then,the reservoir information of well-trained ESN in OLT will be broadcasted to all ONUs and those ESN agents working in ONUs are allowed to conduct independent service-awareness function. Thus,resources allocation and transport policy are both determined only in ONUs. Simulation results show that the proposed mechanism is able to better support the ability of multiple services.