In-network storage management in large scale wireless sensor networks - A survey.

Effectively using constrained memory resources in wireless sensor nodes to efficiently enhance data availability is essential. Storage management techniques in wireless sensor networks aim to replicate data across rendezvous nodes to reduce query latency and increase data availability. The second factor affecting the network's lifespan is whether the data collector is stationary or moving. In the WSNs with a mobile sink, the data are gathered from the sensors by using the mobile sink to mitigate energy hole or hotspot issue by regularly visiting the network. Furthermore, to minimize energy consumption, the mobile sink gathers the data from rendezvous nodes rather than every cluster head. In-network storage management protocols stores the data in a specific group of nodes i.e., rendezvous node, and the selection of rendezvous node is the critical issue to enhance the network lifetime, delay throughput, and energy utilization. In this article, we have highlighted critical ideas of existing in-network storage protocols based on network topology, virtual backbone, transmission strategy, and reliability. The essential arguments of in-network storage protocols have also been summarized. [ABSTRACT FROM AUTHOR]