Performance Analysis of Time Synchronization Protocols in Wireless Sensor Networks.

Area of Science:

• Computer Science
• Network Engineering
• Wireless Communication

Background:

• Time synchronization is critical for wireless sensor network (WSN) applications like scheduling and tracking.
• Practical implementation faces challenges due to hardware, message delay jitter, environment, and topology.
• Existing protocols offer micro-scale resolutions but struggle with real-world network variability.

Purpose of the Study:

• To evaluate the performance of Flooding Time Synchronization Protocol (FTSP) and Gradient Time Synchronization Protocol (GTSP) under practical network conditions.
• To identify factors affecting time synchronization accuracy in WSNs.
• To propose and validate an enhanced FTSP (E-FTSP) for improved robustness.

Main Methods:

• Performance measurement of FTSP and GTSP under varying message delay jitter, synchronization periods, network topologies, and packet loss rates.
• Comparative analysis of standard FTSP against its extended version (E-FTSP).
• Empirical evaluation focusing on error accumulation and time accuracy.

Main Results:

• FTSP performance degrades significantly with message delay jitter, especially over multiple hops, due to error accumulation.
• GTSP also shows sensitivity to network conditions.
• The proposed E-FTSP demonstrates a marked improvement in mitigating the effects of message delay jitter.
• E-FTSP enhances overall FTSP performance regarding accuracy and time factors.

Conclusions:

• Message delay jitter is a primary challenge for time synchronization in practical WSNs.
• Standard FTSP is vulnerable to jitter-induced errors.
• E-FTSP offers a viable solution to enhance time synchronization reliability in challenging wireless environments.