| Delay-Tolerant Network Experiments on the MeshTest Wireless Testbed (2009) | |||||||||||||||
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| Abstract — Delay Tolerant Networks (DTNs) are a class of networks in which a contemporaneous end-to-end path from source to destination generally does not exist. Such networks often use on a store-carry-forward communication model which relies on the mobility of nodes to transfer data between geographically separated nodes. DTN researchers have relied heavily on simulation for evaluation, due to the difficulty and expense of running live experiments with real nodes and real DTN implementations. MeshTest is a laboratory-based multi-hop wireless testbed that can subject real wireless nodes with real DTN implementations to reproducible mobile scenarios. It uses shielded enclosures and an RF matrix switch to dynamically control the attenuation experienced between pairs of nodes. The testbed is an ideal platform for DTN testing, offering convenient experimental control and data management. We have installed the DTN2 Reference Implementation on the testbed nodes, and in this paper we report on a series of experiments based on the well known Data MULE model. Specifically, we investigate the effects of buffer limitations on the data MULEs and sensors node, velocity of the data MULEs, and bundle generation size and rate. We report experimental results including message delivery rate and latency for varying experimental parameters. We have found that an encounter between nodes does not guarantee a successful data transfer. In our experience, the quality and duration of the link, contention, and load on the nodes all influence the performance of the nodes. I. | |||||||||||||||
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