A QoS-AWARE PROTOCOL FOR IMAGE DELIVERY IN WISNs
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DOI:
https://doi.org/10.34238/tnu-jst.15852Abstract
Wireless image sensor networks require highly reliable image packet transmission despite stringent energy and bandwidth constraints. To address these constraints, this paper proposes a QoS-aware image transmission protocol that integrates a multi-resolution discrete wavelet transform with a smart-routing transmission protocol. The wavelet transform is employed to decompose images into sub-bands with unequal reconstruction importance, enabling priority-aware forwarding and retransmission decisions. The smart-routing transmission protocol determines packet forwarding and retransmission decisions based on joint node-level and packet-level priority assignments. Nodes exploit overhearing to assist retransmissions and improve reliability. Furthermore, pipelined transmission, combined with time-slot scheduling, reduces end-to-end delay while supporting energy conservation. Experimental results show that the proposed protocol achieves a packet delivery ratio exceeding 97% over a ten-hop path while maintaining an end-to-end delay of approximately 1.45 seconds and more balanced energy consumption than conventional protocols.Downloads
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