Abstract: Time synchronization is a basic and important factor of wireless sensor networks. This protocol adopts sender-receiver mode to transmit time-sync packet, MAC layer time stamping and linear regression methods are used to improve the accuracy of the synchronization. This paper presents the method of cutting the overhead of time-sync, using the next level node degree (NLND), selecting some particular nodes to send packets and other nodes only receive packets passively. The method has lower overhead than flooding broadcast.

Key words: multi-hop, linear regression, next level node degree, active node, passive node

摘要： 时间同步在无线传感器网络中是一个重要的基础性因素。该文采用发送方-接收方模式传播时间同步消息包，应用线性回归方法和MAC层打时间戳的方法来改善时间同步的精度。提出降低同步开销的方法：利用下级节点度选取某些特定节点，发送消息包，其他节点只是被动接收消息。相比泛洪广播，大大降低了网络开销。

关键词: 多跳, 线性回归, 下级节点度, 主动节点, 被动节点

CLC Number: 

• TP393