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Wireless sensor networks that are energy-constrained must transmit and receive data as efficiently as possible. If the transmission is delay tolerant, transferring blocks of accumulated data can be more efficient than transferring each sensed measurement as soon as it is available. This paper proposes a Block Transfer Protocol (BTP) designed for efficient and reliable transmission in wireless sensor networks. BTP reduces the time it takes to reliably transfer a block of packets compared to conventional link layer protocols, by piggybacking in data packets information about the transfer, minimizing the number of acknowledgements needed for reliable transmission, and reducing the need for timeouts, which can substantially slow down communication when transmission is unreliable.
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