Research On Routing Protocol Of Underwater Mobile Self-organizing Network Based On Opportunity Network

With the increasing importance of marine resources,marine military,marine transportation in the world,and the further development of underwater communication technology and autonomous underwater vehicle technology,underwater mobile self-organizing networks have gradually become worldwide research hot spot.The routing protocol with the shared information of nodes to determine the best path for data transmission,which is the foundation of network communication.Underwater mobile self-organizing networks are different from terrestrial networks.The underwater environment is more complex,and underwater acoustic channels have long delays,narrow bandwidths,and high bit error rates.In addition,the flexibility of AUV movement and the dynamic change of the topology in the network have brought huge challenges to design a routing protocol for underwater mobile self-organizing networks.Therefore,how to overcome the network instability caused by AUV movement and problem of underwater acoustic channels,design a reliable and efficient routing and forwarding strategy is the key to improving the performance of underwater networks.This paper uses the idea of opportunistic network routing protocol to forward data packets through the encounter opportunities generated by AUV mobile.Therefore,a mobile model is established by analyzing the moving state of AUV,which provides a basis for the research and simulation of routing protocols for underwater mobile self-organizing networks,and an I-LOM mobile model is proposed.Due to the changes in the network model,the AUV replaces the traditional underwater sensor nodes.Therefore,the two-dimensional sea area described by the traditional Lagrangian oceanographic model is optimized into three-dimensional sea areas.An artificial potential field algorithm is used to optimize obstacle avoidance for possible marine obstacles in the three-dimensional sea area,and then an improved I-LOM movement model is established.For the design of routing protocols,this paper according to the AUV mobile information provided by the I-LOM mobile model,proposes a CAOR routing protocol based on comprehensive evaluation.The key of the CAOR protocol is to use the method of dynamically adjusting the weight of the mobility evaluation model and the forwarding capability evaluation model to comprehensively evaluate the AUV,and after the end of the forwarding,make feedback on the forwarding results,and use the feedback value to update the routing.After accumulating multiple forwarded feedback values,the precise delivery of data packets is gradually realized,and reliable transmission is guaranteed in a complex and changeable underwater environment,which improves the overall network performance.The simulation results show that the AUV using the I-LOM movement model realizes the 3D underwater self-organizing network AUV movement information monitoring,and basically achieves seabed obstacle avoidance.Compared with the traditional Epidemic protocol,prophet protocol,and trust-based TOR protocol,the CAOR protocol can get a higher packet delivery rate,a shorter average end-to-end delay,and can achieve packet forwarding by using fewer hops.