Reasearch On Low-Delay Routing Design And Resource Scheduling For Uav Emergency Networks

Due to the vast territory of our country and the diversity of climate and terrain,a large number of natural disasters occur every year in our country.After these disasters,the communication infrastructure on the ground may be damaged.The harsh disaster environment and complex terrain make it impossible for rescuers to go deep into the disaster area.Communication service could not be covered,which brings great challenges to timely acquisition of disaster information.In recent years,due to its flexible and easy deployment,flying ad hoc networks(FANETs)have achieved great development.They are widely used in many civil and military scenarios,providing a very effective solution for disaster sensing and emergency communication.However,there are still two problems in the application of FANETs in emergency scenarios.Firstly,due to the limited energy storage of UAV,the survival time of each node in the network is limited.These nodes frequently leave and join the network,resulting in the intensification of network topology changes.In addition,the use of wireless communication between UAV nodes exacerbates the instability of wireless links in the disaster area.Traditional routing protocols cannot adapt to the characteristics of UAV Communication,which aggravates the problems of packet loss,delay and so on.Secondly,due to the urgency of emergency disaster relief,emergency communication has high requirements for the freshness of disaster information.Due to the urgency of emergency disaster relief,emergency communication has high requirements for the timeliness of disaster information.While the traditional routing method lacks relevant performance indicators,so it is impossible to design a targeted routing method.Therefore,aiming at the two problems discussed above,this paper studies the routing scheme in UAV emergency communication network.The following are the specific research contents:Firstly,considering the needs of perception and communication coverage in emergency scenarios,FANETs is used to cover the disaster area.According to the characteristics of UAV wireless communication,based on traditional routing protocol OLSR,the influence of node energy consumption,channel bandwidth and packet queue length are additionally considered.We studied the congestion avoidance routing based on link state,the relay node selection mechanism and path calculation scheme in the routing protocol are optimized.As result,transmission delay and packet loss rate are reduced,and throughput is improved.Secondly,considering the need for disaster perception and transmission in emergency scenarios,FANETs are used to sample and transmit disaster situations.Due to the limited energy consumption of UAV nodes,unrestricted information collection will reduce the network survival time.In addition,considering the high requirements of emergency communication on the timeliness of disaster information,the unpolished information collection and forwarding will lead to the timeliness of information at some nodes.Therefore,in order to in order to save energy consumption and improve the timeliness of information,optimize the acquisition frequency of the sampling UAV,and design the routing and transmission scheduling strategy of the transmission UAV.A new metric AoI(Age of Information)is introduced as a new performance indicator to quantify the timeliness of data.Finally,in order to verify the implementation of the optimized routing protocol proposed in this paper,we use Raspberry Pi to build wireless Ad Hoc nodes.Deploying the optimized routing protocol on all nodes and using the packet filtering system of the Linux system to set the topology.The performance test of data packet sending and receiving in the scenario verifies that this protocol can effectively reduce packet loss,reduce delay and increase throughput,which has certain practical application value.