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一种基于位置的WSAN密钥预分配方案 总被引:1,自引:1,他引:0
论文从无线传感器和执行器网络的信息传输方式出发,提出一种新的密钥预分配方案。方案充分利用执行器节点具有能量充足、存储器资源丰富、较强计算和通信能力等特点,结合部署位置信息,在执行器节点-执行器节点和执行器-传感器节点两个通信层上采用不同的密钥预分配方案。通过分析可知,新方案在连通性、安全性、计算和通信消耗上都有良好性能。 相似文献
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《现代电子技术》2017,(4)
无线传感器网络存储能力不高,导致以往提出的无线传感器网络时钟同步算法的安全性能不高、同步误差较大,现提出基于安全性的无线传感器网络时钟同步算法。基于安全性的无线传感器网络时钟同步系统中的父节点构建无线传感器网络和子节点,子节点通过与父节点进行数据交互,平衡无线传感器网络时钟同步,CC2530芯片将父节点和子节点进行连接。无线传感器网络时钟同步的运算工作在仿真器中完成,传输接口将父节点和子节点的交互信息输出到仿真器,为运算工作提供数据仿真源。安全性调试接口对父节点构建网络结果和时钟同步运算结果进行实时展示。系统对同步安全算法和同步算法语言的设计,较为有效地实现了无线传感器网络时钟同步。经实验验证可知,所提算法同步误差小,安全性能高。 相似文献
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无线传感器网络中各传感器节点通过自组织的方式构成,协作地实时监测、感知和采集各种环境或监测对象的信息,一旦某个节点损坏或者被窃取,那么将可能影响整个网络并在网络中传递错误信息。该文针对区域监控网络中单跳网络损坏节点的检测问题,以图论分析为基础,采用特别的网络模型对无线传感网络加以描述,以基站产生虚拟报警机制和特殊报警源求因算法来定位损坏节点,以网络覆盖性能和损坏节点检测率作为算法性能评估标准。实验结果表明:基于二分图的损坏节点识别算法能很好地检测并剔除损坏节点,从而保证无线传感器网络正常工作。 相似文献
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无线视频传感器网络可应用于监控、护理、农产品防害等多重领域,具有十分广泛的应用价值。同时,无线视频传感器网络涉及数字图像处理、传感器、无线通信和嵌入式系统等多门学科,也具有很高的理论研究价值。无线视频传感器网络的各项功能都紧密依赖于其节点平台的软硬件能力。另一方面,节点的设计方案也在很大程度上主宰了无线传感器网络的性能... 相似文献
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Wireless sensor and actor networks (WSANs) have been increasingly popular for environmental monitoring applications in the last decade. While the deployment of sensor nodes enables a fine granularity of data collection, resource-rich actor nodes provide further evaluation of the information and reaction. Quality of service (QoS) and routing solutions for WSANs are challenging compared to traditional networks because of the limited node resources. WSANs also have different QoS requirements than wireless sensor networks (WSNs) since actors and sensor nodes have distinct resource constraints.In this paper, we present, LRP-QS, a lightweight routing protocol with dynamic interests and QoS support for WSANs. LRP-QS provides QoS by differentiating the rates among different types of interests with dynamic packet tagging at sensor nodes and per flow management at actor nodes. The interests, which define the types of events to observe, are distributed in the network. The weights of the interests are determined dynamically by using a nonsensitive ranking algorithm depending on the variation in the observed values of data collected in response to interests. Our simulation studies show that the proposed protocol provides a higher packet delivery ratio and a lower memory consumption than the existing state of the art protocols. 相似文献
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Wireless sensor and actor networks: research challenges 总被引:46,自引:0,他引:46
Wireless sensor and actor networks (WSANs) refer to a group of sensors and actors linked by wireless medium to perform distributed sensing and acting tasks. The realization of wireless sensor and actor networks (WSANs) needs to satisfy the requirements introduced by the coexistence of sensors and actors. In WSANs, sensors gather information about the physical world, while actors take decisions and then perform appropriate actions upon the environment, which allows a user to effectively sense and act from a distance. In order to provide effective sensing and acting, coordination mechanisms are required among sensors and actors. Moreover, to perform right and timely actions, sensor data must be valid at the time of acting. This paper explores sensor-actor and actor-actor coordination and describes research challenges for coordination and communication problems. 相似文献
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Wireless sensor and actor networks (WSANs) are more promising and most addressing research field in the area of wireless sensor networks in recent scenario. It composed of possibly a large number of tiny, autonomous sensor devices and resources rich actor nodes equipped with wireless communication and computation capabilities. Actors collect sensors’ information and respond collaboratively to achieve an application specific mission. Since actors have to coordinate their operation, a strongly connected inter-actor network would be required at all the time in the network. Actor nodes may fail for many reasons (i.e. due of battery exhaustion or hardware failure due to hash environment etc.) and failures may convert connected network into disjoint networks. This can hinder sometimes not only the performance of network but also degrade the usefulness and effectiveness of the network. Thus, having a partitioning detection and connectivity restoration procedure at the time of failure occurs in the network is crucial for WSANs. In this paper, we review the present network partitioning recovery approaches and provide an overall view of this study by summarizing previous achievements. 相似文献
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Melodia T. Pompili D. Gungor V.C. Akyildiz I.F. 《Mobile Computing, IEEE Transactions on》2007,6(10):1116-1129
In this paper, coordination and communication problems in wireless sensor and actor networks (WSANs) are jointly addressed in a unifying framework. A sensor-actor coordination model is proposed based on an event-driven partitioning paradigm. Sensors are partitioned into different sets, and each set is constituted by a data-delivery tree associated with a different actor. The optimal solution for the partitioning strategy is determined by mathematical programming, and a distributed solution is proposed. In addition, a new model for the actor-actor coordination problem is introduced. The actor coordination is formulated as a task assignment optimization problem for a class of coordination problems in which the area to be acted upon needs to be optimally split among different actors. An auction-based distributed solution of the problem is also presented. Performance evaluation shows how global network objectives, such as compliance with real-time constraints and minimum energy consumption, can be achieved in the proposed framework with simple interactions between sensors and actors that are suitable for large-scale networks of energy-constrained devices. 相似文献
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Actor-oriented directional anycast routing in wireless sensor and actor networks with smart antennas
Current routing protocols in wireless sensor and actor networks (WSANs) shows a lack of unification for different traffic patterns because the communication for sensor to actor and that for actor to actor are designed separately. Such a design poses a challenge for interoperability between sensors and actors. With the presence of rich-resource actor nodes, we argue that to improve network lifetime, the problem transforms from reducing overall network energy consumption to reducing energy consumption of constrained sensor nodes. To reduce energy consumption of sensor nodes, especially in challenging environments with coverage holes/obstacles, we propose that actor nodes should share forwarding tasks with sensor nodes. To enable such a feature, efficient interoperability between sensors and actors is required, and thus a unified routing protocol for both sensors and actors is needed. This paper explores capabilities of directional transmission with smart antennas and rich-resource actors to design a novel unified actor-oriented directional anycast routing protocol (ADA) which supports arbitrary traffic in WSANs. The proposed routing protocol exploits actors as main routing anchors as much as possible because they have better energy and computing power compared to constraint sensor nodes. In addition, a directional anycast routing approach is also proposed to further reduce total delay and energy consumption of overall network. Through extensive experiments, we show that ADA outperforms state-of-the-art protocols in terms of packet delivery latency, network lifetime, and packet reliability. In addition, by offer fault tolerant features, ADA also performs well in challenging environments where coverage holes and obstacles are of concerns. 相似文献
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Wireless sensor and actor networks (WSANs) are characterized by the collective effort of heterogeneous nodes called sensors and actors. Sensor nodes collect information about the physical world, while actor nodes take action decisions and perform appropriate actions upon the environment. The collaborative operation of sensors and actors brings significant advantages over traditional sensing, including improved accuracy, larger coverage area and timely actions upon the sensed phenomena. However, to realize these potential gains, there is a need for an efficient transport layer protocol that can address the unique communication challenges introduced by the coexistence of sensors and actors. In this paper, a real-time and reliable transport (RT) protocol is presented for WSANs. The objective of the (RT) protocol is to reliably and collaboratively transport event features from the sensor field to the actor nodes with minimum energy dissipation and to timely react to sensor information with a right action. In this respect, the (RT) protocol simultaneously addresses congestion control and timely event transport reliability objectives in WSANs. To the best of our knowledge, this is the first research effort focusing on real-time and reliable transport protocol for WSANs. Performance evaluations via simulation experiments show that the (RT) protocol achieves high performance in terms of reliable event detection, communication latency and energy consumption in WSANs. 相似文献
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In many applications of wireless sensor actor networks (WSANs) that often run in harsh environments, the reduction of completion times of tasks is highly desired. We present a new time‐aware, energy‐aware, and starvation‐free algorithm called Scate for assigning tasks to actors while satisfying the scalability and distribution requirements of WSANs with semi‐automated architecture. The proposed algorithm allows concurrent executions of any mix of small and large tasks and yet prevents probable starvation of tasks. To achieve this, it estimates the completion times of tasks on each available actor and then takes the remaining energies and the current workloads of these actors into account during task assignment to actors. The results of our experiments with a prototyped implementation of Scate show longer network lifetime, shorter makespan of resulting schedules, and more balanced loads on actors compared to when one of the three well‐known task‐scheduling algorithms, namely, the max‐min, min‐min, and opportunistic load balancing algorithms, is used. 相似文献
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Wireless sensor and actor networks (WSANs) can be considered as a combination of a sensor network and an actor network in which powerful and mobile actor nodes can perform application specific actions based on the received data from the sensors. As most of these actions are performed collaboratively among the actors, inter-actor connectivity is one of the desirable features of WSANs. In this paper, we propose a novel distributed algorithm for establishing a connected inter-actor network topology. Considering initially disjoint sets of actors, our algorithm first initiates a search process by using the underlying sensor network in order to detect the possible sub-networks of actors in the region. After these sub-networks are detected, our algorithm pursues a coordinated actor movement in order to connect the sub-networks and thus achieve inter-actor connectivity for all the actors. This coordinated movement approach exploits the minimum connected dominating set of each sub-network when picking the appropriate actor to move so that the connectivity of each sub-network is not violated. In addition, the approach strives to minimize the total travel distance of actors and the messaging cost on both sensors and actors in order to extend the lifetime of WSAN. We analytically study the performance of our algorithm. Extensive simulation experiments validate the analytical results and confirm the effectiveness of our approach. 相似文献
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The paper discusses two distributed actor to actor communication schemes (a single channel one and a multi-channel one) for wireless sensor actor networks (WSANs). The performance of these two schemes is evaluated through analysis and simulation. The simulation results show that the whole analysis is fairly accurate. It is further proven that the multi-channel scheme has better performance than the single channel one. The key feature of the multi-channel scheme is the separation of the single hop from the multi-hop traffic. 相似文献
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In this paper, localization problem in wireless sensor and actor networks (WSAN) is addressed. In WSAN, the performance of
event detection and tracking highly depends on the exact location information of the events that must be reported along with
the event features. Having precise location information of the sensor nodes, actors are able to execute actions more effectively
in the region of detected events. In this context, the accurate localization of sensor nodes is essential with respect to
the actors. Particularly, the problem becomes much more complicated when the sensor nodes as well as the anchor nodes (actors)
are mobile. In order to localize the mobile sensor nodes relative to the actors, a novel Timing-based Mobile Sensor Localization
(TMSL) algorithm is introduced. In TMSL, sensor nodes determine their distance from actors by using propagation time and speed
of RF signal. In order to determine distance from the actors, actors actively broadcast reference beacons in a pattern of intervals adaptively defined according to the mobility of sensor nodes and the required level of localization
accuracy. These reference beacons carry the interval numbers in which they were transmitted. The interval numbers are then
used by the sensor nodes to calculate the start time of the beacons locally which is then used to determine the propagation
time. TMSL does neither require nor assume any time synchronization among the sensor nodes or with the actors. Performance
evaluations clearly show that TMSL is adaptive to velocity of mobile sensor and actor nodes and can be configured according
to the required localization accuracy in order to avoid overhead raised due to high velocity. 相似文献