【摘要】 高精度低功耗的时间同步对于无线传感网络至关重要,文中重点分析了高精度时间同步算法,发现其在多跳网络时间同步过程中由于每跳范围内所有节点均要广播时间同步包,会产生大量的冗余信息。为降低同步功耗,提出了一种新方法,通过调节发射功率,筛选出每一跳范围内的周边节点,使其完成下一跳范围的时间同步,而非周边节点只接受却不发送时间同步包。最后,针对改进的算法在OMNet++上进行了仿真实验,仿真结果表明,改进后的算法能够有效地降低全网能量消耗。更多还原

【Abstract】 The low-power and high-precision time synchronization for wireless sensor networks is essential. This paper focuses on a high-precision time synchronization algorithm FTSP( Flooding Time Synchronization Protocol) and finds that in multi-hop networks the time synchronization process generates much redundant information because all of the nodes in each hop must broadcast time synchronization packets. In order to reduce power consumption, this paper proposes a novel approach which selects some nodes called edge nodes by adjusting the transmission power in each hop and allows them to complete time synchronization for the next hop. The other nodes only receive time synchronization packets. Finally,the improved algorithm is carried out on OMNet ++ simulator and the results show that the improved algorithm can effectively reduce the energy consumption of the whole network.更多还原