Considering voids in the routing process of underwater acoustic sensor networks and low energy efficiency in data transmission,An Opportunistic Routing fusing Depth Adjustment and Adaptive Forwarding(OR-DAAF)technique is developed.Aiming at routing voids,instead of adopting the traditional detour strategy,OR-DAAF proposes a topology control-based void recovery mode algorithm,which uses the residual energy to grade void nodes and successively adjusts them to the new depth to overcome routing voids and restore network connectivity.Aiming at low energy efficiency in data transmission,OR-DAAF proposes a forwarding area division mechanism that selects the forwarding area to suppress redundant packets.It also puts forward a multi-hop and multi-objective routing decision index based on weighted advance distance,energy and link quality,comprehensively considering regional energy,link quality and advance distance to achieve an energy efficiency balance.Experimental results show that compared with a Doppler VHF omnidirectional range,OR-DAAF improves packet delivery rate by 10%and network lifetime by 48.7%,respectively and reduces delay by 22%.
维普
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