DBR has low stability period due to increased data flooding in medium-depth nodes. The most widely used depth-based routing protocols are Depth Based Routing (DBR) and Energy Efficient Depth Based Routing (EEDBR). In this subcategory, sensor nodes use their depth information to forward data towards sinks, which are stationed at the surface of aqueous environment. Depth based routing as a subcategory of localization-free routing protocols, is designed to cope with the above mentioned challenges. In Underwater Wireless Sensor Networks (UWSNs), the major challenges are high propagation latency in data transmission, dynamic topology of nodes due to wave movements and high power consumption of acoustic modem.
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