Design And Implementation Of Underwater Acoustic Sensor Network Architecture

Underwater Wireless Acoustic Sensor Network(UWASN)is a key technology for monitoring underwater environment and exploring underwater resources,which plays a great role in underwater applications such as marine environment sampling,marine data collection,geographic environment monitoring,emergency avoidance,auxiliary navigation and seabed monitoring.Because of the hash transmission condition,long delay and high BER of UWASN,the traditional wireless sensor network architecture is no longer suitable for UWASN,and meanwahile there is no mature network architecture for UWASN yet.Therefore,it is of great theoretical significance and application value to study the UWASN architecture.From the perspectives of Marine environment adaptation,network self-healing,energy perception,and effective information interaction,combining the characteristics of UWASN and the requirements of underwater transmission tasks,this paper puts forward a new UWASN architecture model based on the traditional wireless sensing network and the delay tolerance network.In the data forwarding surface,a unified "control center" is used to communicate the protocol layers to achieve the flexible combination of protocol stacks and provide a good cross-layer design platform to increase the cross-layer benefits in the network.At the same time,a message-oriented overlay,named "delivery layer",has been added to the architecture to address heterogeneity between network regions or network nodes,long delays in underwater data transmission,and link interruption.In order to verify the protocol's organization form,flexibility of protocol layer's connection,protocol stack adaptive and cross-layer design in the proposed new UWASN architecture,the paper designs and implements the "control center",named the Lincross platform.In order to realize the flexible configuration of protocol layer during runtime and meet the stability requirements of different protocol instances during operation,Lincros platform organizes different protocol instances into cooperative process groups,and it is Lincros Core's responsibility to communicate and schedule between protocol processes,which is to improve the stability of the system,the real-time operation of the system and the concurrence of protocol operation.In order to solve the problems of long delay and link interruption in UWASN,the paper designs and realizes the "delivery layer" of the proposed new UWASN architecture.The delivery layer is used as an application layer agent,working on the "delivery layer gateway" node of some backbone networks,forming a "store-carry-forward" coverage layer network.At the same time,the delivery layer uses persistent storage against network outages.The paper gives a detailed design of the network area and node naming addressing of the delivery layer,the data transmission of the delivery layer,link awareness and path selection,the reliable control of the hybrid AQR segment based on package-level coding,the resource allocation and network diagnosis and the function adapter.In addition,the paper gives the overall framework of delivery layer's implementation and some important functional modules,including data transceiver process,neighbor discovery process and reliability control process.The paper simulates and semi-physically verifies the proposed new UWASN architecture,and compares the traditional UWASN architecture.The experimental results are basically consistent with the simulation results,which proves that the new UWASN architecture proposed in this paper has lower average end-to-end transmission latency,higher network goodput and transmission efficiency,and can better accomplish the data transmission task in UWASN with high delay,high bit error rate and high probability of link interruption.