A Distributed Cache Points Selection scheme for reliable transport protocols with intermediate caching in Wireless Sensor Networks

摘要

Traditional reliable transport protocols use end-to-end retransmission for the recovery of lost packets, which has high cost in Wireless Sensor Networks (WSNs). Hence, reliable transport protocols in WSNs use caching packets at the intermediate nodes in order to avoid costly end-to-end retransmission for loss recovery. Hop-by-hop retransmission scheme is one of the most important caching policies. This scheme requires large cache memory space which is in paradox with memory constraint in sensor nodes. In this paper, we propose a Distributed Cache Points Selection (DCPS) scheme. The proposed scheme tries to select cache points using a model based on probability theory so that it prevents packets end-to-end retransmission. Evaluation results show the efficiency of the proposed scheme regarding the required cache memory space.