共查询到20条相似文献,搜索用时 15 毫秒
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Lintong Jiang Xiaobing Wu Guihai Chen Yuling Li 《Mobile Networks and Applications》2014,19(4):543-551
Using mobile chargers in wireless rechargeable sensor networks is an option for charging all the nodes in the network. In order to achieve some performance requirement such as coverage, it is necessary to effectively schedule the mobile chargers to serve every node of the network. We notice that nearly all previous works on mobile charger scheduling assume that mobile chargers move along predetermined paths which are computed based on perfect priori information. In this paper, we consider the problem of scheduling mobile chargers in an on-demand way to maximize the covering utility. On receiving re-charging requests from the nodes, the mobile charger decides how to move itself. The covering utility is defined to quantify the effectiveness of event monitoring. We formulate the scheduling problem as an optimization one. We propose three heuristics for this problem after proving its NP-Completeness. We further generalize our solutions to accommodate the multiple mobile chargers case. Finally we evaluate our solutions through extensive simulations. 相似文献
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Energy-Efficient Scheduling for Wireless Sensor Networks 总被引:3,自引:0,他引:3
《Communications, IEEE Transactions on》2005,53(8):1333-1342
We consider the problem of minimizing the energy needed for data fusion in a sensor network by varying the transmission times assigned to different sensor nodes. The optimal scheduling protocol is derived, based on which we develop a low-complexity inverse-log scheduling (ILS) algorithm that achieves near-optimal energy efficiency. To eliminate the communication overhead required by centralized scheduling protocols, we further derive a distributed inverse-log protocol that is applicable to networks with a large number of nodes. Focusing on large-scale networks with high total data rates, we analyze the energy consumption of the ILS. Our analysis reveals how its energy gain over traditional time-division multiple access depends on the channel and the data-length variations among different nodes. 相似文献
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无线传感器网络中覆盖问题的研究 总被引:3,自引:0,他引:3
简要介绍了无线传感器网络体系结构、特点和应用领域.针对无线传感器网络节点覆盖问题进行了研究,提出了基于最短路径的覆盖算法,并给出了仿真结果. 相似文献
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Lightweight Deployment-Aware Scheduling for Wireless Sensor Networks 总被引:14,自引:0,他引:14
Wireless sensor networks consist of a large number of tiny sensors that have only limited energy supply. One of the major
challenges in constructing such networks is to maintain long network lifetime as well as sufficient sensing areas. To achieve
this goal, a broadly-used method is to turn off redundant sensors. In this paper, the problem of estimating redundant sensing
areas among neighbouring wireless sensors is analysed. We present simple methods to estimate the degree of redundancy without
the knowledge of location or directional information. We also provide tight upper and lower bounds on the probability of complete
redundancy and on the average partial redundancy. With random sensor deployment, our analysis shows that partial redundancy
is more realistic for real applications, as complete redundancy is expensive, requiring up to 11 neighbouring sensors to provide
a 90 percent chance of complete redundancy. Based on the analysis, we propose a scalable Lightweight Deployment-Aware Scheduling
(LDAS) algorithm, which turns off redundant sensors without using accurate location information. Simulation study demonstrates
that the LDAS algorithm can reduce network energy consumption and provide desired QoS requirement effectively.
This research was partially supported by Natural Sciences and Engineering Research Council of Canada.
Kui Wu received his Ph.D. in Computing Science from the University of Alberta, Canada, in 2002. He joined the Department of Computer
Science at the University of Victoria, Canada in the same year and is currently an Assistant Professor there. His research
interests include mobile and wireless networks, network performance evaluation, and network security.
Yong Gao received his Master's degree and Ph.D. degree in computer science from University of Alberta, Canada, in 2000 and 2005 respectively.
He is currently with the Irving K. Barber School of Arts and Sciences, UBC Okanagan, Canada. His research interests include
search algorithms and AI, communication networks, and computational biology.
Yang Xiao worked at Micro Linear as an MAC (Medium Access Control) architect involving the IEEE 802.11 standard enhancement work before
he joined Department of Computer Science at The University of Memphis in 2002. Dr. Xiao is an IEEE Senior member. He was a
voting member of IEEE 802.11 Working Group from 2001 to 2004. He currently serves as Editor-in-Chief for International Journal
of Security and Networks (IJSN) and for International Journal of Sensor Networks (IJSNet). He serves as an associate editor
or on editorial boards for the following refereed journals: (Wiley) International Journal of Communication Systems, (Wiley)
Wireless Communications and Mobile Computing (WCMC), EURASIP Journal on Wireless Communications and Networking, and International
Journal of Wireless and Mobile Computing. He serves as five lead/sole guest editor for five journal special issues. He serves
as a referee/reviewer for many funding agencies, as well as a panelist for NSF. His research interests are Security/ Reliable
Communications, Medium Access Control, Mobility/Location/Paging Managements, Cache Access and Replacement Policies, Quality
of Service, Energy Efficiency, and Routing in wireless networks and mobile computing. 相似文献
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System lifetime of wireless sensor networks (WSN) is inversely proportional to the energy consumed by critically energy-constrained sensor nodes during RF transmission. In that regard, modulated backscattering (MB) is a promising design choice, in which sensor nodes send their data just by switching their antenna impedance and reflecting the incident signal coming from an RF source. Hence, wireless passive sensor networks (WPSN) designed to operate using MB do not have the lifetime constraints of conventional WSN. However, the communication performance of WPSN is directly related to the RF coverage provided over the field the passive sensor nodes are deployed. In this letter, RF communication coverage in WPSN is analytically investigated. The required number of RF sources to obtain interference-free communication connectivity with the WPSN nodes is determined and analyzed in terms of output power and the transmission frequency of RF sources, network size, RF source and WPSN node characteristics. 相似文献
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提出了一种与节点位置无关的、能量感知的无线传感器网络覆盖控制协议EACCP(an Energy-Aware Coverage Control Protocol for wireless sensor networks),EACCP采用基于节点分层成簇的思想,根据节点邻居平均能量与自身剩余能量等参数竞选活动节点.理论分析与模拟实验表明EACCP协议不但能够提供高质量的网络覆盖率,而且可以有效地适应于节点能量异构的网络应用场景,并且减少活动节点选取过程中的控制消息开销. 相似文献
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Senlin Zhang Zixiang Wang Meikang Qiu Meiqin Liu 《Journal of Signal Processing Systems》2013,72(3):197-208
In wireless sensor networks, there are many information exchanges between different terminals. In order to guarantee a good level of Quality of Service (QoS), the source node should be smart enough to pick a stable and good quality communication route in order to avoid any unnecessary packet loss. Due to the error-prone links in a wireless network, it is very likely that the transmitted packets over consecutive links may get corrupted or even lost. It is known that retransmissions will increase the overhead in the network, which in turns increase the total energy consumption during data transmission. In this paper, we focus on the Bit Error Rate (BER) during packet transmission and propose a power scheduling scheme to reduce the total energy consumption in the routing. Our approach controls the transmission power of each transmitter to achieve the minimum energy consumption for successful packet transmission. Considering the limited bandwidth resource, we also plan the multihop route while considering the BER and network load at the same time. The simulation results show that our approach can reduce the total energy consumption during data transmission. 相似文献
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By reducing interferences drastically, time division multiple access (TDMA) based approaches are considered one of the most efficient solutions to optimize resources’ use. The existing protocols, however, address only the latency minimization without considering the waste of energy, which typically results from idle listening or frequent transitions of the radio module between sleep and active modes. Besides, only saturated systems are considered in these protocols, which may imply resources’ underutilization in some practical use cases. In this paper, we present an energy-aware TDMA-based link scheduling protocol, named deterministic link scheduling protocol (DLSP), designed with the aim of achieving both low energy consumption and low latency in wireless sensor networks. DLSP takes advantage of the spatial reuse of interference-free time slots using conflict graphs. Unlike earlier studies that often considered saturated traffic, we propose to relax the saturation assumption in order to maintain good performance when some of the nodes have no data to send. Thus, we propose to define the following transmission periods: a period to send the own data of the nodes and a period to relay packets. The simulation results clearly show the effectiveness of the proposed protocol, in terms of latency and energy consumption, compared to existing approaches. 相似文献
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在无线传感器网络目标跟踪的过程中进行节点调度,可以综合考虑跟踪误差和能量消耗,延长传感器网络的使用寿命。为了综合考虑节点调度的短期和长远损失,该文将问题建模为部分可观测马尔科夫决策过程(POMDP)以得到更优的调度策略,并提出一种近似求解算法C-QMDP。该算法利用马尔科夫链蒙特卡洛方法(MCMC)推导连续状态空间的置信状态的转移,并计算瞬时代价。使用状态离散化方法,基于马尔科夫决策过程(MDP)值迭代求解未来代价的近似值。仿真结果表明,相比现有POMDP近似算法,该文算法既可以降低跟踪过程中的累积损失,又可以将大量运算进行离线计算,减小了在线决策时的计算量。 相似文献
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Wireless Personal Communications - The performance of a wireless sensor network is limited by the available bandwidth of the shared wireless channel. For the need to share the available bandwidth... 相似文献
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Saadi Nora Bounceur Ahcène Euler Reinhardt Lounis Massinissa Bezoui Madani Kerkar Moussa Pottier Bernard 《Wireless Personal Communications》2020,111(3):1525-1543
Wireless Personal Communications - The challenge in the deployment of wireless sensor networks is to ensure the coverage of targets with high energy efficiency, particularly when coverage and... 相似文献
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定位技术是无线传感器网络数据采集的基础服务,而定位精度的高低在很大程度上取决于距离测量的精度。基于RSSI(接收信号强度)测距技术无须添加任何硬件设施、用较少的通信开销和较低的实现复杂度,十分适应于能量受限的无线传感器网络。通过对RSSI测距模型进行分析,并提出一种针对室内环境的参数修正方案。通过自行研发的传感器节点Ubicell上进行验证分析,实验表明,采用环境参数修正方案后,明显提高了测距的精度。 相似文献
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该文提出了一种基于准格型策略的无线传感网协作覆盖QGCC(Quasi-Grid based Cooperative Coverage)算法,通过在随机分布节点中构造准格型结构并结合协作感测模型,减少活动节点数量,延长覆盖周期。QGCC设计了低复杂度的分布式虚拟网格确定方法及能量高效的节点调度策略,定义了不规则度指标以分析网络的不规则程度对覆盖性能的影响。仿真实验表明,相比于参照算法,QGCC能够较大程度地减少活动节点的数量,大幅延长网络的覆盖周期;此外,该算法的覆盖周期和节点密度具有近似线性的关系,且比参考算法具有更大的斜率,说明其对冗余节点具有更高的利用效率。 相似文献