Original scientific paper

Adaptive Time Synchronization for Homogeneous WSNs

Siddhartha Chauhan ; Department of Computer Science and Engineering, National Institute of Technology, Indi
Lalit Kumar Awasth ; Department of Computer Science and Engineering, National Institute of Technology, Indi

Abstract

Wireless sensor networks (WSNs) are being
used for observing real‐world phenomenon. It is
important that sensor nodes (SNs) must be synchronized
to a common time in order to precisely map the data
collected by SNs. Clock synchronization is very
challenging in WSNs as the sensor networks are
resource constrained networks. It is essential that clock
synchronization protocols designed for WSNs must be
light weight i.e. SNs must be synchronized with fewer
synchronization message exchanges. In this paper, we
propose a clock synchronization protocol for WSNs
where first of all cluster heads (CHs) are synchronized
with the sink and then the cluster nodes (CNs) are
synchronized with their respective CHs. CNs are
synchronized with the help of time synchronization
node (TSN) chosen by the respective CHs. Simulation
results show that proposed protocol requires
considerably fewer synchronization messages as
compared with the reference broadcast synchronization
(RBS) protocol and minimum variance unbiased
estimation (MUVE) method. Clock skew correction
mechanism applied in proposed protocol guarantees
long term stability and hence decreases re‐
synchronization frequency thereby conserving more
energy

Keywords

Clock synchronization; time synchronization; wireless sensor networks (WSNs)

Hrčak ID:

76920

URI

https://hrcak.srce.hr/76920

Publication date:

15.6.2011.

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