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无线传感器网络(WSN)是一种全新的信息获取和处理技术,但传统的路由协议不能有效地应用于无线传感器网络。文章简要介绍了无线传感器网络的体系结构,对当前一些较为重要的路由协议的核心路由机制进行了分析,最后展望了无线传感器网络路由协议未来的研究方向。在未来的研究中,路由协议需要进一步改进或设计新的路由协议,使网络具备更好的可伸缩型和更强的适应网络拓扑变化的能力。 相似文献
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媒体访问控制(MAC)协议是保证无线传感器网络(WSN)高效通信的关键网络协议之一。MAC层协议节能效率的好坏将严重影响网络性能。文章说明了MAC层能量消耗的主要来源,介绍了MAC协议的分类,对主要MAC协议进行了比较,最后对MAC协议的发展方向进行了展望。 相似文献
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基于ZigBee的无线传感器网络研究 总被引:3,自引:1,他引:3
为了验证ZigBee协议的有效性,叙述了新型无线ZigBee通信技术,介绍ZigBee协议的结构和特点,基于ZigBee协议的无线网络设备以及网络拓扑结构;ZigBee标准协议栈结构及数据在协议栈内部的传输机制。以两个网络设备成网为例,详细给出了ZigBee设备形成网络时,各个设备的工作状态、设备之间网络连接过程以及数据帧的发送过程。最后,通过Microchip公司的ZigBee实验平台验证了ZigBee无线星型组网,实验证明,ZigBee技术是有效的无线传感器网络组网技术。 相似文献
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详细介绍无线传感器网(WSN)两种代表性协议:信息协商传感器(SPIN)协议和低能量自适应分簇路由(LEACH)协议的概念、原理和优缺点。提出路由协议中需要进一步解决的问题。改进的WSN路由算法应尽可能降低节点能耗,以延长网络生存时间。 相似文献
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详细介绍无线传感器网络(WSN)的两种代表性协议:信息协商传感器(SPIN)协议和低能量自适应分簇路由(LEACH)协议的概念、原理和优缺点.提出路由协议中需要进一步解决的问题.改进的WSN路由算法应尽可能降低节点能耗.以延长网络生存时间. 相似文献
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分析了一种建立在ZigBee协议基础之上的无线传感器网络系统,首先对ZigBee协议进行了简要介绍,然后分析了基于ZigBee协议构建无线传感器网络系统的基本思路与结构,然后从硬件、软件两个方面入手,就系统建设中的关键技术要点展开探讨。 相似文献
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针对LEACH协议存在的3大问题:簇头选举时未考虑节点剩余能量、频繁成簇造成了大量额外能耗以及欠缺对簇间能耗均衡的考虑,提出了能量有效分簇路由协议(LEACH-improved).该协议中,首轮成簇后网络中簇的分布和数量将保持不变,以后每轮各簇的簇头由上一轮簇头结合节点的能量水平来指定,借鉴泛洪算法的思想,在簇间建立多... 相似文献
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A novel Multiple Access Control(MAC) protocol-User-dependent Perfect-scheduling Multiple Access(UPMA) protocol,which supports joint transmission of voice and data packets,is proposed.By this protocol,the bandwidth can be allocated dynamically to the uplink and downlink traffic with on-demand assignment and the transmission of Mobile Terminals(MTs) can be perfectly scheduled by means of polling.Meanwhile.a unique frame stucture is designed to guarantee Quality of Service(QoS) in voice traffic supporting.An effective colision resolution algorthm is also proposed to guarantee rapid channel access for activated MTs.Finally,performance of UPMA protocol is evaluated by simulation and compared with MPRMA protocol.Simulation results show that UPMA protocol has better performance. 相似文献
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Yu Genjian Zheng Baoyu Xu Li 《电子科学学刊(英文版)》2007,24(4):550-556
Aiming at the significance of the energy controls of wireless sensor networks, an economical energy consumption algorithm for wireless communicating in Wireless Sensor Networks (WSN) is presented. Based on the algorithm, the maximal system throughput of WSN is analyzed, and the upper bound of throughput of WSN is proposed and proved. Some numerical simulations are conducted and analyzed. The conclusions include that the transmitting radius of sensor node and the parameters of the energy cost function have significant influence upon the throughput, but the monitoring region radius has little influence. For the same transmitting distance, the more the hopping of information trans- mitting, the better the throughput of WSN. On the other hand, for the energy optimization of the whole WSN, the trade-off problem between the throughput capacity and the relay nodes is proposed, and the specific expression of relay hops that minimized the energy consumptions and the maximal throughput of WSN under the specific situation is derived. 相似文献
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This paper proposes an approach called PC-CORP (Power Control based Cooperative Opportunistic Routing Protocol) for WSN (Wireless Sensor Networks), providing robustness to the random variations in network connectivity while ensuring better data forwarding efficiency in an energy efficient manner. Based on the realistic radio model, we combine the region-based routing, rendezvous scheme, sleep discipline and cooperative communication together to model data forwarding by cross layer design in WSN. At the same time, a lightweight transmission power control algorithm called PC-AIMD (Power Control Additive Increase Multiplicative Decrease) is introduced to utilize the cooperation of relay nodes to improve the forwarding efficiency performance and increase the robustness of the routing protocol. In the simulation, the performance of PC-COPR is investigated in terms of the adaptation of variations in network connectivity and satisfying the QoS requirements of application. 相似文献
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为缓解交通阻塞、提高路网通过能力、减少交通事故、降低能源消耗以及减轻环境污染,可基于无线传感网络和ZigBee协议构建一种大范围、全方位、实时、准确、高效的综合运输和管理系统——智能交通系统。通过布置传感器节点构建无线网络,可收集道路上的物理参数和环境信息,如车辆速度、车流量、环境温度、路面噪音和震动等,达到车辆交通监测的目的。使用OPNET仿真软件对该系统进行仿真,讨论了网络在不同拓扑、不同车流量以及节点失效情况下的仿真结果,并对网络性能进行了评估,给网络规划及系统构建提供了可靠的定量依据和启发。 相似文献
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Wireless Sensor Networks (WSNs) are being deployed for a wide variety of applications and the security problems of them have received considerable attention. Considering the limitations of power, com-putation capability and storage resources, this paper proposed an efficient defense against collusion scheme based on elliptic curve cryptography for wireless sensor networks in order to solve the problems that sensor node-key leaking and adversaries make compromised nodes as their collusions to launch new attack. In the proposed scheme, the group-key distribution strategy is employed to compute the private key of each sensor node, and the encryption and decryption algorithms are constructed based on Elliptic Curve Cryptography (ECC). The command center (node) only needs to broadcast a controlling header with three group elements, and the authorized sensor node can correctly recover the session key and use it to decrypt the broadcasting message. Analysis and proof of the proposed scheme’s efficiency and security show that the proposed scheme can resist the k-collusion attack efficiently. 相似文献
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Clock synchronization for wireless sensor networks: a survey 总被引:10,自引:0,他引:10
Recent advances in micro-electromechanical (MEMS) technology have led to the development of small, low-cost, and low-power sensors. Wireless sensor networks (WSNs) are large-scale networks of such sensors, dedicated to observing and monitoring various aspects of the physical world. In such networks, data from each sensor is agglomerated using data fusion to form a single meaningful result, which makes time synchronization between sensors highly desirable. This paper surveys and evaluates existing clock synchronization protocols based on a palette of factors like precision, accuracy, cost, and complexity. The design considerations presented here can help developers either in choosing an existing synchronization protocol or in defining a new protocol that is best suited to the specific needs of a sensor-network application. Finally, the survey provides a valuable framework by which designers can compare new and existing synchronization protocols. 相似文献
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Considering severe resources constraints and security threat hierarchical routing protocol algorithm. The proposed routing of wireless sensor networks (WSN), the article proposed a novel protocol algorithm can adopt suitable routing technology for the nodes according to the distance of nodes to the base station, density of nodes distribution, and residual energy of nodes. Comparing the proposed routing protocol algorithm with simple direction diffusion routing technology, cluster-based routing mechanisms, and simple hierarchical routing protocol algorithm through comprehensive analysis and simulation in terms of the energy usage, packet latency, and security in the presence of node protocol algorithm is more efficient for wireless sensor networks. compromise attacks, the results show that the proposed routing 相似文献
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设计一套基于无线自组网技术的监控系统,旨在对运输及库存中的重要产品进行远距离监控,避免繁琐的人工管理过程。从通信组网、硬件设计方面介绍了初步方案设计,拟利用短距离、低耗的WSN实现相对静止空间内的组网,利用MANET实现相对运动时的组网,以实现全国范围内的,信息传递时间小于5分钟的动态监控网络。 相似文献