共查询到17条相似文献,搜索用时 46 毫秒
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在分析无线传感器网络节能要求的基础上对无线传感器网络路由协议中使用的休眠调度算法进行了讨论,内容包括各种休眠调度算法的基本实现方法、考虑因素以及涉及到的关键技术.最后指明休眠调度对传感器网络节能的重要性. 相似文献
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文中设计了一种基于休眠调度策略的无线传感网络分簇协议.该协议计算出簇首最佳比例和网络瞬时剩余能量,采用固定簇首数目与剩余能量估计的方法对网络进行分簇,在成簇后的数据传送阶段采用蚁群算法计算出节点的唤醒概率,最后通过仿真实验与LEACH、SEP协议进行了比较.实验结果表明:该协议在对目标保持较好探测效果的前提下能更均匀的消耗网络的能量,从而延长网络的生命周期. 相似文献
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带休眠算法的无线传感器网络MAC协议 总被引:1,自引:0,他引:1
由于无线传感器网络中每个传感器节点的能量有限,所以需要有效的MAC协议来保持能量的高效利用。在MAC协议中引入休眠算法是其中一种重要的节能方式。现有的带休眠算法的无线传感器网络MAC协议已有很多种,主要分为2大类:一类是以S-MAC协议为代表的基于休眠/监听排程方案来达到节能目的的MAC协议;另一类是以WiseMAC为代表的基于低功率信道检测方案的MAC协议。对现有的主要几种有代表性的带休眠算法的无线传感器网络MAC协议进行了描述,分析了它们各自的优缺点,并进行了对比和总结。 相似文献
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针对无线传感器网络中节点能量有限等特点,提高能量利用效率和延长网络寿命是无线传感器网络设计的目标。由于终端节点只负责数据采集,不需要转发其它节点的数据,因此可以减少终端节点的空闲侦听时间,从而进入休眠状态。仿真结果验证了所提方案的能量消耗低于传统非休眠方案的能量消耗,该休眠算法能有效延长网络的生存时间。 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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针对传统节点休眠调度算法中覆盖率低、活跃节点数量多以及能量消耗不均匀的问题,基于可信信息覆盖模型,提出一种基于粒子群优化算法(Particle Swarm Optimization,PSO)的无线传感网络节点休眠调度算法.算法充分利用可信信息覆盖模型的优势构建最优的可信信息覆盖集合和簇头候选集合,从可信信息覆盖集合和簇... 相似文献
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A queuing analytical model is presented to investigate the performances of different sleep and wakeup strategies in a solar-powered wireless sensor/mesh network where a solar cell is used to charge the battery in a sensor/mesh node. While the solar radiation process (and, hence, the energy generation process in a solar cell) is modeled by a stochastic process (i.e., a Markov chain), a linear battery model with relaxation effect is used to model the battery capacity recovery process. Developed based on a multidimensional discrete-time Markov chain, the presented model is used to analyze the performances of different sleep and wakeup strategies in a sensor/mesh node. The packet dropping and packet blocking probabilities at a node are the major performance metrics. The numerical results obtained from the analytical model are validated by extensive simulations. In addition, using the queuing model, based on a game-theoretic formulation, we demonstrate how to obtain the optimal parameters for a particular sleep and wakeup strategy. In this case, we formulate a bargaining game by exploiting the trade-off between packet blocking and packet dropping probabilities due to the sleep and wakeup dynamics in a sensor/mesh node. The Nash solution is obtained for the equilibrium point of sleep and wakeup probabilities. The presented queuing model, along with the game-theoretic formulation, would be useful for the design and optimization of energy-efficient protocols for solar-powered wireless sensor/mesh networks under quality-of-service (QoS) constraints 相似文献
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Range-Based Sleep Scheduling (RBSS) for Wireless Sensor Networks 总被引:3,自引:0,他引:3
Sleep scheduling in a wireless sensor network is the process of deciding which nodes are eligible to sleep (enter power-saving
mode) after random deployment to conserve energy while retaining network coverage. Most existing approaches toward this problem
require sensor’s location information, which may be impractical considering costly locating overheads. This paper proposes
range-based sleep scheduling (RBSS) protocol which needs sensor-to-sensor distance but no location information. RBSS attempts
to approach an optimal sensor selection pattern that demands the fewest working (awake) sensors. Simulation results indicate
that RBSS is comparable to its location-based counterpart in terms of coverage quality and the reduction of working sensors.
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Yang-Min ChengEmail: |
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无线传感网自适应能量驱动簇头轮换算法研究 总被引:1,自引:1,他引:1
分簇结构是大规模无线传感网(WSN)的一种有效的拓扑管理方法。在这种结构下,由于簇头(Cluster Head,CH)节点的能耗速率远高于簇成员节点(Cluster Member,CM),需要做簇头轮换以平衡网络能耗。该文分析了基于能量驱动的簇头轮换策略,并提供一种基于簇头节点实时负载来估计其启动轮换的能量阈值的自适应簇头轮换算法(Adaptive Cluster Rotation Algorithm,ACRA)。仿真结果表明,与现有算法如LEACH,EDAC等比较,ACRA算法最少化簇头轮换次数,延长了网络生存时间。 相似文献
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Nasrollazade Fateme Moghadam Meisam Nesary Pourmina Mohammad Ali 《Wireless Personal Communications》2022,126(2):1345-1361
Wireless Personal Communications - Security in vehicular ad hoc network (VANET) is one of the major challenging topics and the secure key interchange between two legitimate vehicles is an important... 相似文献