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Traditional reliable transport protocols have been designed to perform end-to-end delivery transparently to the intermediate nodes along the path (e.g., TCP). The resource-constrained nature of a Wireless Sensor Network (WSN) requires a new paradigm where intermediate nodes are able to cache packets and retransmit them on-demand during packet loss recovery in order to avoid incurring costly end-to-end retransmissions. This paper addresses the problem of cache partitioning optimization at the transport layer. They implemented several caching policies integrated into the DTSN transport protocol and analyzed their effect on overall network performance in terms of transmission cost, throughput, and fairness.
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