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Abstract-Delay Tolerant Networking (DTN) enables transfer of data where conventional network protocols fail to deliver data because no continuous end-to-end connectivity is available. While the Bundle Protocol (BP) has been established as the standard DTN protocol in many application areas, Wireless Sensor Networks (WSN) often use proprietary protocols with a subset of the BP features.In this paper we use an exemplary application to demonstrate how the BP can be beneficial for many WSN-based projects. We show, how low-power sensor nodes can transport bundles by exploiting existing movement in the environment. More importantly we show, how 8-bit WSN nodes can seamlessly interact with standard BP implementations running on standard PCs.Our application, a sensor that is installed on the roof of a 15-story building, is using an elevator to transport bundles carrying measured values to our lab. We analytically compare the BP to existing protocols for WSNs, evaluate our application scenario and give insight into principal limitations.

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Abstract-Typical home automation systems consist of dense populated sensors and actuators in wireless networks. In apartment houses, networks are often deployed closely to each other by different neighbors. In such scenarios wireless networks suffer from packet loss caused by interference with other networks. Packet loss causes unnecessary delay and energy consumption. To overcome this, transmission power control can be used to lower the interference. However, reducing the interference is a rarely used capability of transmission power control. This paper presents transmission power control based on a P-controller. The feedback loop for the signal-to-noise ratio is realized by modifying the link layer acknowledgments of IEEE 802.15.4. The evaluation of the system is performed in a real-world testbed. It shows the benefit of reducing the transmission power in dense networks. The application layer loss can be lowered by 5%.