FOCS '02 Proceedings of the 43rd Symposium on Foundations of Computer Science
Using redundancy to cope with failures in a delay tolerant network
Proceedings of the 2005 conference on Applications, technologies, architectures, and protocols for computer communications
SolarStore: enhancing data reliability in solar-powered storage-centric sensor networks
Proceedings of the 7th international conference on Mobile systems, applications, and services
AdaptSens: An Adaptive Data Collection and Storage Service for Solar-Powered Sensor Networks
RTSS '09 Proceedings of the 2009 30th IEEE Real-Time Systems Symposium
Efficient erasure correcting codes
IEEE Transactions on Information Theory
A digital fountain approach to asynchronous reliable multicast
IEEE Journal on Selected Areas in Communications
Energy efficient data aggregation in solar sensor networks
WASA'11 Proceedings of the 6th international conference on Wireless algorithms, systems, and applications
Energy efficient joint data aggregation and link scheduling in solar sensor networks
Computer Communications
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Solar-powered sensor nodes have incentive to spend extra energy, especially when the battery is fully charged, because this energy surplus would be wasted otherwise. In this paper, we consider the problem of utilizing such energy surplus to adaptively adjust the redundancy level of erasure codes used in communication, so that the delivery reliability is improved while the network lifetime is still conserved. We formulate the problem as maximizing the end-to-end packet delivery probability under energy constraints. This formulated problem is hard to solve because of the combinatorics involved and the special curvature of its objective function. By exploiting its inherent properties, we propose an effective solution called SolarCode, which has a constant approximation ratio. We evaluate SolarCode in the context of our solar-powered sensor network testbed. Experiments show that SolarCode is successful in utilizing energy surplus and leads to higher data delivery reliability.