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Recent research has shown that existing TCP/IP protocol family is likely to exhibit poor performance in space communication networks. To deal with communication challenges in deep space, an architecture called Inter-Planetary Ad hoc Network (IPAN) is envisioned to establish a communication infrastructure among planets, natural and artificial satellites, and various mission elements such as spacecrafts and rovers. Some of these classes of nodes in such networks may be resource constrained in terms of storage, energy and processing power. This work proposes a probabilistic routing protocol called "Buffer Aware Routing Protocol in Interplanetary Ad hoc Network (BARPIN)" for routing best-effort network traffic based on the store and forward principle of Delay Tolerant Networking (DTN).
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