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Study of consensus-based time synchronization in wireless sensor networks.

Jianping He¹, Hao Li¹, Jiming Chen¹

¹State Key Laboratory of Industrial Control Technology, Department of Control Science and Engineering, Zhejiang University, Zheda Road 38#, Hangzhou 310027, China.

ISA Transactions

|November 30, 2013

Summary

This summary is machine-generated.

This study evaluates consensus-based time synchronization protocols in wireless sensor networks using testbed experiments. A new protocol, MMTS, is proposed to improve clock accuracy while maintaining performance.

Keywords:

Consensus-based time synchronization Experimental study Maximum and minimum consensus Wireless sensor networks

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Area of Science:

Computer Science
Electrical Engineering
Network Engineering

Background:

Consensus-based time synchronization protocols are crucial for wireless sensor networks (WSNs).
Real-world performance of these protocols is often hindered by hardware and network uncertainties.
A gap exists between theoretical protocol performance and practical implementation in WSNs.

Purpose of the Study:

To investigate the tolerance of consensus-based time synchronization protocols to uncertainties in practical WSN implementations.
To analyze the impact of system uncertainties on time synchronization accuracy for Average Time Synchronization (ATS) and Maximum Time Synchronization (MTS) protocols.
To propose and evaluate a modified protocol (MMTS) for improved clock accuracy in WSNs.

Main Methods:

Extensive testbed experiments were conducted using Micaz nodes.
Analysis of how system uncertainties affect time synchronization accuracy for ATS and MTS.
Implementation and performance evaluation of ATS, MTS, and the proposed MMTS protocol under various network settings.

Main Results:

Testbed experiments revealed the impact of hardware and network uncertainties on ATS and MTS protocols.
The Maximum Time Synchronization (MTS) protocol may lead to synchronized clocks running slightly faster than desired.
The proposed Maximum-Minimum Time Synchronization (MMTS) protocol demonstrated improved clock accuracy without sacrificing convergence rate or synchronization accuracy.

Conclusions:

Consensus-based time synchronization protocols exhibit varying degrees of robustness to real-world uncertainties in WSNs.
The proposed MMTS protocol offers a practical solution for achieving more accurate time synchronization in WSNs.
MMTS effectively addresses the clock speed issue observed in MTS while retaining its benefits.