Research On Service Composition Optimization Method For Satellite Network

With the continuous development of satellite manufacturing technology and communication technology,satellite networks gradually have the ability to independently complete user service requests and service calculations,and can bear the pressure of ground business.Considering the limitation of the current satellite resources,the best form of service operation within the satellite range is the sub-service form.The sub-service is distributed and deployed at each satellite node to provide more service forms.Due to the floating use of satellite resources,the quality of service provided by the same function sub-services of different nodes in the same service portfolio will vary.At the same time,when the dynamic disturbance of satellite system is caused by the change of user’s request for service and the disturbance of satellite resources,the service combination scheme needs to have efficient and real-time change capability.Therefore,the research of service composition on satellite is of great significance.In order to solve the problem of service combination under limited satellite resources and satellite dynamic disturbance,the following research will be carried out in this paper:In view of the limited resources of satellite network,this paper studies the service composition problem under the constraint of multi-resources and multi-user requests,introduces the reverse order number of service execution priority to measure the change of service execution order,and establishes a service composition model with the goal of the best QoS of composite service and the minimum reverse order number of service execution priority,A self-adjusting genetic algorithm that automatically updates the crossover mutation operator is proposed to verify the model.The simulation results show that this method can provide users with better service composition schemes,and is superior to the benchmark experiment in terms of service quality and the reverse order of service execution priority.In case of dynamic disturbance of satellite system caused by disturbance of satellite resources or change of user request service,the initially allocated service combination scheme cannot continue to provide services for users.Therefore,based on the previous research point,in order to cope with the dynamic disturbance scenario of satellite,this paper proposes a multi-objective dynamic service combination method,and analyzes the disturbance factors that cause the initial scheme to be unavailable,According to different disturbance factors,the corresponding dynamic service composition model is established.The model aims at the best combined service income and the minimum initial service change.A hyper-heuristic operator based on artificial bee colony is proposed to verify the model.The simulation results show that this method can provide users with more diverse and efficient service composition schemes,and that the combined service income is positively correlated with the unchanged initial service.