Authors:
Xiaoyuan Ma
;
Weisheng Tang
;
Jianming Wei
;
Jun Huang
and
Bo Zhang
Affiliation:
Chinese Academy of Sciences, China
Keyword(s):
Clock Synchronization, WSN, Clock Granularity, PulseSync.
Related
Ontology
Subjects/Areas/Topics:
Sensor Networks
;
Technologies and Standards
;
Wireless Information Networks
Abstract:
Nowadays clock synchronization has become crucial in wireless sensor network (WSN), in particular for
those scenarios where the common reference time is vital for applications. The existing approaches often
suffer from synchronizing errors since the effect of clock granularity is overlooked. In this paper, a novel
algorithm is proposed on the basis of PulseSync algorithm. Compared with PulseSync, the improvement of
the presented algorithm is twofold: First, clock discreteness is abated via applying filter method. Second, for
reducing the deviation of estimated clock skew through several hops, relative logical clock rate is straightly
delivered. Our approach, along with the deeper analyses, is further validated with EXP5438 platform using
Contiki operating system in Cooja simulator. The result illustrates that the proposed algorithm outperforms
PulseSync in synchronization accuracy.