期刊名称：International Journal of Distributed Sensor Networks
印刷版ISSN：1550-1329
电子版ISSN：1550-1477
出版年度：2014
卷号：2014
DOI：10.1155/2014/540397
出版社：Hindawi Publishing Corporation
摘要：Since time division multiple access (TDMA) is employed
to reduce power consumption, time synchronization is
critically important for wireless sensor networks. Packet-based
clock correction is one of main methods to maintain synchronization
among nodes. However, in many real cases, such as
industrial equipment monitoring and diagnosis, there is no need
to exchange messages during relatively long time, while highly
accurate time synchronization has to be maintained, which results
in that additional packets have to be exchanged specifically
for synchronization purpose. For addressing this problem, an
adaptive compensation method is proposed in this paper to
achieve a high synchronization precision without exchanging
message frequently. We proved that the adaptive compensation
method can achieve a high synchronization precision with much
fewer packet exchanges. In addition, the performance of the
proposed scheme has been evaluated in three different experimental
settings. In the indoor experiment, compared with the
synchronization method without using compensation, 98% of
the synchronizing packets can be eliminated while maintaining synchronization precision at 100 s. In the outdoor experiment
with higher temperature fluctuation, 80% of the packets can be
eliminated with 100 s synchronization precision. In the case of
sudden temperature changes of more than C, the proposed compensation packet frequency regresses to the frequency of the
synchronization method without compensation.
