An Improved MAC Protocal for Marine-Environment Monitoring WSN System

To meet the demand of the energy consumption, transmission bandwidth, high reliability and real-time transmission for marine-environment monitoring networks, we propose a Real-Time Data Duty Cycle Adaptive (RDDCA) algorithm to improve the Medium Access Control (MAC) layer of IEEE802.15.4 wireless communication standard, and design an architecture of Wireless Sensor Network (WSN) with star topology WSN system for monitoring marine-environment based on the RDDCA algorithm. Through the proposed system with sensor nodes, remote sensing terminals and data center, the states of the sensor nodes can be judged dynamically. The decision of whether to change the duty cycle of the transmission data can be made in the Marineenvironment remote sensing terminals. Simulations performed in Network Simulation Version 2 (NS2) show that the star topology based RDDCA algorithm for WSN system can achieve the demands of the marine-environment monitoring applications. Comparing with traditional IEEE802.15.4 standard, it is found that the performance is improved significantly in energy consumption, sensor nodes lifetime, network throughput and real-time performance.