Application of delay tolerant networking (DTN) in Airborne Networks

As airborne networks (ANs) evolve and become increasingly net-centric, it is critical that apt consideration is given to properly extend Internet protocol (IP)-based networking services to the tactical assets. This is an effort to resolve current interoperability issues through the use of a standard protocol and provide IP connectivity between all airborne network platforms. However, large gaps exist between the current AN architecture and future envisioned net-centric capabilities. The dynamic nature of the AN topology, typically characterized by highly intermittent links and long link delays, limits the use and effectiveness of Internet-based standards and protocols. Developed separately, the delay tolerant network (DTN) architecture has been designed to address the needs of networks characterized by link intermittency, lack of end-to-end connectivity between end users, and high latency. While originally developed for deep space networking and inter-planetary communications, DTNs are highly applicable for sensor-based networks, terrestrial wireless networks, satellite networks, underwater acoustic networks as well as airborne networks. This paper addresses the specific challenges of establishing and maintaining reliable communications within an IP-based AN environment. In addition, this paper provides an overview of DTN, and details how this technology may be integrated into to the AN infrastructure in order to address the current issues affecting AN performance.