An Active Region-based Storage Mechanism in Large Wireless Sensor Networks

Providing efficient and robust storage service in large sensor networks is critical and challenging. In this paper, an active region-based storage (ARS) mechanism is proposed to accommodate the dynamic data-access behaviors and mutable external environments, where solar intensity which energy producing depends on changes dynamically. The ARS divides the whole network into geographical regional sub-networks, each of which contains sensor nodes and storage nodes, handled by an intelligent agent. Storage nodes are responsible for storing and forwarding data collected, while agents, aware of the change of energy and service, make transitions of the global data distribution dynamically to ensure robust service. Moreover, strategies of ARS also take account of node mobility and resilience to node failure. To evaluate the applicability to the dynamic and complicated external behaviors of ARS, the whole system is modeled and simulated, and the results indicate that ARS mechanism can achieve energy equalization and long-term steady service.