83 / 2015-12-13 21:58:36

NC-ODTN：Ocean DTN Network Coding Protocol

Because oceanic surface’s complex environments, such as varied weather conditions, and its easy reflection and refraction of wireless signals, oceanic wireless communication networks suffer low link quality and intermittent connectivity, which in turn disable the stability of end-to-end communication path. The above characteristics make oceanic wireless communication network (OWCN) a de facto Delay/Disruption Tolerant Network (DTN). Although numerous existing DTN protocols adopted replication-based schemes to deal with the long transmission delay incurred by the intermittent connectivity issue, the replication-based schemes had reached its limit to reduce the transmission delay. Moreover, the replication-based schemes can cause the transmission inefficiency and even congestion problems. Therefore, replication alone cannot meet the service requirement of oceanic wireless communication networks for transmission delay, reliability, and throughput, etc. Therefore, we designed a Oceanic DTN Network Coding Protocol (NC-ODTN) protocol for oceanic wireless networks, considering the characteristics of oceanic wireless communication. To evaluate the performance of NC-ODTN, we implement NC-ODTN on a testbed consisting of over 20 wireless nodes. The experimental results have shown that NC-ODTN effectively improves data transmission rate and greatly reduce transmission delay, compared with existing TCP/IP protocols.