Clock Synchronization in Wireless Sensor Network With Selective Convergence Rate for Event Driven Measurement Applications

Abstract

In this paper, a novel wireless sensor network synchronization protocol for event-driven measurement applications is proposed. The objective is twofold: 1) to provide high accuracy in the area where an event is detected and 2) to ensure a long network lifetime. The complexity of the problem arises from the fact that these two properties are usually in conflict. To increase the synchronization accuracy, nodes are required to exchange synchronization packets at higher rate, thus impacting the network lifetime. Vice versa to ensure a long network life time, the number of packets to be exchanged should be minimized thus impacting the synchronization accuracy. A tradeoff can be achieved by observing that the packet rate should be increased only for the portion of the network surrounding the detected events as only these nodes require a higher accuracy to collect data. The proposed algorithm represents a formalization of this idea. Numerical and experimental results are provided to validate the effectiveness of the proposed algorithm.Index Terms-Clock synchronization, consensus algorithm, measurement applications, wireless sensor network (WSN).

Clock synchronization protocol for wireless sensor networks with bounded communication delays

“…In Lamonaca et al (2014), the clock synchronization problem for event-driven measurement applications is addressed. In particular, the authors propose a consensus-based protocol which allows to achieve high accuracy in the area where an event is detected and ensure long network lifetime.…”

Initial Phase Proximity for Reachback Firefly Synchronicity in WSNs: Node Clustering

“…The duties of the WSNs can be executed properly when it is supported by robust basic requirements such as time synchronization, synchronicity, self-configuration, and self-localization. For example, time synchronization is extremely required to ensure the high accuracy measurement for an event-driven measurement application in an area where an event is detected [1]. Synchronicity inspired by the biological Many phenomena exist in the natural system around us, which have inspired many scientists to solve various problems within the engineering field or the specific problems of WSNs.…”

Clock synchronization algorithms for networked systems

“…Sun 等 [71] 设计一种随机广播通信机制下的一致性时间同步算法 (RBDS), 即在伪通信时 刻斜率、偏差共同补偿和在非伪通信时刻偏差单独补偿的混合补偿策略, 该算法克服了 ATS 和 MTS 等通信方案只能在固定的通信时刻下更新时钟的局限性. Gasparri 等针对不同应用等级所需的不同同 步精度设计了一种柔性的一致性时间同步方案, 通过可选择的收敛速率优化时钟同步精度与网络生存 能量之间的平衡关系 [72,73] . 之后 Gasparri 等 [74] 设计了一种对有界延时鲁棒的改进一致性时钟同步 算法 (RoATS), 该算法利用成对节点之间同幅同位补偿机制, 克服了标准 ATS 算法在有界延时扰动 下发散的缺陷.…”