Topology Control Algorithms For QoS-guaranteed In UWSN And Research On The Monitoring System Of Water Quality

With the rapid development of industrialization,regional economy and urbanization,the problem of water pollution is becoming more and more serious.On the basis of the background and mature technologies of Wireless Sensor Networks(WSNs),the research of Underwater Wireless Sensor Network(UWSN)with a wide application prospect has been a hot topic.The sensor nodes randomly deployed in the underwater 3D monitoring domain collect the information and transmit the data to the other sensor nodes.Due to the high energy consumption,large transmission delay,susceptible environment,water mobility and narrow bandwidth,the research of relevant theories in UWSN is a huge challenge.Considering the underwater environmental characteristics and problems of UWSN,the propagation characteristics of underwater acoustic communication in UWSN network model are studied in this paper.Based on the network model,a power control algorithm for underwater environment is proposed.Then,an energy efficient underwater network topology control algorithm is presented for multiple optimization objects.Finally,a basic application platform is constructed to realize monitoring functions.The main work is organized as follows:1.An underwater wireless sensor network model for complex water environmen is proposed for the problem of water mobility and underwater acoustic wave propagation.The model consists of Meandering Current Mobility(MCM)node limited mobility model,end-to-end delay model and energy consumption model.The MCM node limited mobility model combining the MCM flow model and the node anchoring method based on the theory of marine dynamics and hydrodynamics is proposed.The factors such as mobility,speed of sound,multipath propagation,and transmission success rate are taken into account in the end-to-end delay model and the influences of different environmental factors on end-to-end delay are studied.The energy consumption model intergrating with the noise function and the propagation loss function can be applied to underwater acoustic communication networks.The network model has a wide application scope,which provides a good simulation environment for related theoretical research in UWSN.2.A power and rate control algorithm based on non-cooperative game theory in UMWSN(UM-NGPR)is proposed for the problems of large delay,high energy consumption and mobility.An underwater node-constrained motion model is introduced and improved to establish a non-cooperative game model.A mapping relationship is built between the decision variables,the solution space and the optimization goals in general optimization problem and the participants,the strategy space and utility function in game model.Furthermore,the existence and uniqueness of Nash equilibrium solution for power and rate are proved,respectively.Finally,the approximate optimal solution is obtained by using bivariate Newton iteration method.3.A topology control algorithm(OPG-UTCA)for underwater wireless sensor network based on multiple QoS targets is proposed for the problems of the existing underwater acoustic network topology control algorithms such as inhomogeneous energy consumption,large delay and low success rate.The multi-objective optimization problem of coverage,connectivity,average energy consumption,average end-to-end delay and average transmission success rate is regarded as a game problem.So a potential game model is constructed and it is proved that the ordinal potential function and Nash equilibrium are existing.First,all the nodes participate in the game.After the network reaches the Nash equilibrium state,the nodes which have the largest utility function value in the cluster are selected as cluster heads and there are no other cluster heads in their own communication radius.Due to all cluster heads are disconnected,they must participate in the second game process and establish the connectivity relationship for balancing the energy consumption of the whole network.4.A multi-parameter online monitoring system of water quality based on underwater wireless sensor network is designed for the practical application.The overall scheme design architecture that contains the software and hardware designs of underwater sensor nodes,buoy nodes and the software design of water quality monitoring mobile terminal based on Android is introduced in detail.Underwater sensor nodes are responsible for collecting water quality data and transmitting to the buoy nodes through the underwater acoustic transducer.The buoy nodes receive the data through the underwater acoustic transducer and retransmit them to Ali cloud server through the wireless radio module / GPRS module and store data into the database.Finally,the water quality monitoring mobile terminal can connect with the server database to query real-time data and historical data.The algorithms mentioned above are simulated,and the experimental results demonstrate that the proposed algorithms are effective.Compared with the same kinds of algorithms,it outperforms in network energy consumption,end-to-end delay and transmission success rate.Besides,the physical testing results of multi-parameter online monitoring system of water quality show that the system with underwater acoustic transducer can work stably in the underwater environment and meet the requirements of multi-parameter online monitoring system of water quality.Generally,the system has a broad application prospect.