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1.
Neighbor discovery enables nodes in the networks to discover each other through simple information interaction,which was suitable for the new mobile low duty cycle sensor network (MLDC-WSN).However,because the nodes in MLDC-WSN can move randomly and sleep,the network topology was changed frequently,which results in that some nodes need a lot of energy and time to find their neighbors.How to realize fast neighbor discovery for all nodes in the network was a difficult problem in current research.To solve this problem,a new low-latency neighbor discovery algorithm based on multi-beacon messages was proposed.In this algorithm,the nodes were discovered by sending a short beacon message through their neighbor nodes,and by adjusting the time and frequency of beacon message sent,a lower neighbor discovery delay was obtained.Eventually,through quantitative analysis and simulation experiments,it is found that compared with existing algorithms,this algorithm can find all neighbor nodes in MLDC-WSN with less energy consumption,lower latency and greater probability.  相似文献   
2.
梁俊斌  周翔  王田  李陶深 《计算机科学》2018,45(4):19-24, 52
移动低占空比无线传感网(Mobile Low-duty-cycle Wireless Sensor Networks,MLDC-WSN)是一种新型的传感器网络,它能克服传统无线传感网络(WSN)中仅考虑静态网络、网络能耗大等问题。但是,MLDC-WSN的新特性给数据收集应用带来了新的挑战,例如:移动性会导致网络拓扑结构不断改变,造成网络连通性不稳定;节点的苏醒时间短,造成通信延迟大。针对MLDC-WSN中数据收集的研究现状进行了分析和对比,分别从节点移动性管理、节点睡眠调度、数据收集协议等3个方面进行了综述。此外,还总结了该领域中待解决的重要科学问题,并对未来的研究方向进行了展望。  相似文献   
3.
In low-duty-cycle wireless sensor networks, designers have to cope with unreliable links and limited communication capacity. In this work, we propose COST, a coding scheme that leverages spatial-temporal diversity to achieve higher energy efficiency and lower delay of packet transmissions. We particularly address long sleeping intervals in low-duty-cycle networks by exploiting multi-path diversity. Specifically, we propose to employ an erasure-coding scheme to improve reliability. With respect to energy efficiency and delivery timeliness, we formulate the problem in optimal allocation of coded blocks over multiple paths, which is then proved to be NP-hard. We further propose a near-optimal algorithm to solve the allocation problem. Through extensive simulations, we evaluate the impact of network parameters and demonstrate the effectiveness of our proposal.  相似文献   
4.
Quan CHEN  Hong GAO 《通信学报》2015,36(10):224-234
The dynamic switching based real-time(DSRT)routing protocol was proposed to handle the arbitrary end-to-end(E2E)real-time communication in the low-duty-cycle wireless sensor networks.Firstly,the concept of available speed was designed to compensate for the big sleep latency and facilitate discovering the routes with less latency based on two-hop neighbors’ information(at lease about 20% routing path with less latency was discovered by DRST in the experiments).Moreover,it was noticed that the congestion extent in the low-duty-cycle network was determined not only by the number of packets in the network output queue,but also the destination of the packets.However,the traditional method with one-hop neighbors’ information cannot differentiate this kind of congestion.Therefore,combined with the dynamic switching mechanism,the DSRT proposed a congestion avoiding algorithm by classifying the packets in the queue.Through comprehensive experiments,the efficiency of routing discovering and congestion avoiding of the DSRT protocol is demonstrated,and the E2E delay is decreased by at least 200% when the traffic was high.  相似文献   
5.
Mobile low-duty-cycle wireless sensor network is a new kind of wireless multi-hop network,which is self-organized by a large number of nodes that have mobile ability and are able to get into sleep for a long time.Such networks have wide application prospects in national defense,industry,agriculture and other fields that need long term monitoring in severe environments.However,the movement and the sleeping features of nodes lead to constantly change of network topology,which makes the nodes difficult to discover their neighbors quickly.Therefore,the nodes cannot achieve optimal distribution decisions.In order to solve this problem,a new proactive neighbor discovery algorithm was proposed.This algorithm made the nodes in the network take the initiative to find their neighbors when they woke up,and avoided the delay caused by long time waiting in the traditional passive neighbor discovery.In addition,by predicting the movement speed and distance of neighbors,the neighbor set at the next moment can be quickly determined,which can further reduce the delay and obtain more accurate neighbor discovery results.Theoretical analysis and experimental results show that compared with the existing algorithms,the algorithm can find all the neighbors in MLDC-WSN with less energy consumption and lower delay.  相似文献   
6.
针对低占空比WSN网络存在着能量消耗不均、网络工作时长等问题,提出一种节点自适应休眠算法.该算法能够根据无线链路状况,自适应地调度节点休眠时隙和工作时隙,保证在时延约束条件下网络的整体能耗最小.在自适应休眠机制加入能量感知,使无线路由根据节点的剩余能量自适应调整,均衡各节点能耗,提升WSN网络的工作时长.经仿真分析发现,该算法能够在满足传输时延的同时,有效地减少工作时隙并降低能耗,从而提升网络的工作周期.  相似文献   
7.
提出了适用于低轮值无线传感器网络的可靠传输算法,主要特点是发掘并利用低轮值无线传感器网络特有的时空相关性,结合编码机制以获得较高的能量效率和较低的传输时延。针对编码块在多条路径上的最优分配问题进行了建模。由于求解最优策略是NP难题,给出了近似算法,并通过仿真分析了不同参数对近似算法的影响。仿真结果表明,基于时空多样性编码的分配算法能够在较低的能量开销条件下,实现低时延的可靠传输。  相似文献   
8.
基于能量感知的移动低占空比机会网络纠删编码算法   总被引:1,自引:0,他引:1  
低占空比(low-duty-cycle,简称LDC)技术是当前延长无线传感器网络生命周期的最关键技术,为了有效延长机会网络生命周期,将低占空比技术引入机会网络,形成LDC机会网络.但是,现有机会网络路由算法不能很好地适应LDC环境,其性能会大幅度下降.为了解决该问题,提出一种基于能量感知的移动低占空比机会网络纠删编码算法E-EC.仿真实验结果表明,与现有的典型机会网络路由算法相比,E-EC算法在延长移动机会网络生命周期以及增加数据传输成功率等方面带来明显的性能提升.  相似文献   
9.
蒋婵  李陶深  梁俊斌 《电子学报》2018,46(7):1732-1736
低占空比传感网中节点的长时间睡眠会导致数据查询延迟的增加.如何调度节点唤醒时间从而最小化延迟,是一个难解的组合优化问题.提出一个分布式的环状流水线调度算法,不用长时间等待即可进行数据传输.分析表明,算法可获得较低的延迟和更长的网络生命周期.  相似文献   
10.
针对无线传感器网络在节点传输过程中的延迟与链路质量问题,设计一种基于能量探测的节点休眠调度算法EAS,通过对节点插入苏醒时隙来减小端到端之间的延迟,并根据每个节点的剩余能量值进行能量探测,使整个网络中各节点的能量相对均衡地消耗,在保证传输质量的基础上达到延长网络的生命周期的目的。实验结果表明,对比现有算法,EAS算法能够在保证使WSN网络在延迟一定的情况下明显降低能耗,延长整个网络的工作寿命。  相似文献   
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