Research On Routing Problem Of Emergency Communication Based On DTN

China is one of the countries which frequently attacked by disaster such as earthquakes.Some power systems,communication systems and transportation systems will be damaged after the disaster.The transmission of important message will be greatly restricted.Delay tolerant network can adapt to the environment which suffers frequent disconnection,high latency and heterogeneous.It is suitable to deploy emergency communication system on.Most DTN are composed of nodes with limited energy,storage capacity and computing capacity,which limit the performance indexes such as number,delay,arrival rate of information in the network.In order to guarantee the transmission of information which closely related to the survivors,DTN should establish an effective mechanism for message priority to ensure that important messages are well taken care of.Different periods of the disaster will have a great effect on the importance of the information.Nodes in the network should be able to perceive the changes of surrounding environment and change their priority queue.In this thesis,the environment during the disaster was analyzed and the importance of different messages in different periods of the disaster was also discussed,on which a priority based emergency communication routing strategy is proposed.The routing strategy used trusted agent broadcast control message as a basis and added user adjustment which can be rolled back to control the nodes adjust their priority mode adapting to the environment.Finally the routing algorithm was simulated using simulator ONE.By comparing the arrival rate of the proposed algorithm and other routing methods,the performance of proposed routing algorithm was analyzed.