A Novel Rapid-Flooding Approach With Real-Time Delay Compensation for Wireless-Sensor Network Time Synchronization

Area of Science:

• Computer Science
• Electrical Engineering
• Network Engineering

Background:

• Wireless Sensor Networks (WSNs) commonly use flooding time synchronization algorithms.
• Packet delay and clock drift cause significant by-hop error accumulation, challenging synchronization accuracy in WSNs.

Purpose of the Study:

• To propose a novel time synchronization algorithm, rapid-flooding multibroadcast time synchronization with real-time delay compensation (RDC-RMTS), to address accuracy issues in WSNs.
• To reduce flooding latency and mitigate by-hop error accumulation.

Main Methods:

• Implemented a rapid-flooding protocol to decrease latency of time information.
• Developed a joint clock skew-offset maximum-likelihood estimation (MLE) for accurate clock parameter and real-time packet delay estimation.
• Designed an adaptive clock offset estimation for RDC-RMTS.

Main Results:

• The RDC-RMTS significantly reduces variable delay.
• The algorithm effectively slows the growth of by-hop error accumulation.
• Experimental results demonstrate improved accuracy in large-scale WSNs.

Conclusions:

• The proposed RDC-RMTS achieves accurate time synchronization in complex, large-scale WSNs.
• It successfully overcomes challenges posed by packet delay and clock drift.