Research On QoS Guarantee Scheme For Satellite Networks Considering Emergency Services

In recent years, satellite networks has become one of the most important way in themodern communication and been widely used because it has long communicationdistance, wide covering range, high security reliability, big system capacity, and it doesnot suffer from the constraints of poor ground infrastructure and the influences of thenatural disasters in ground local areas. With the rapid development of high-speednetwork technology and the multimedia technology and the increasingly diversificationof communication business types, it has become a hot research spot in satellite networkhow to guarantee the quality of service(QoS) in satellite network effectively.This thesis studies that for the limited bandwidth resources in satellite networks,therefore, providing differentiated services according to the characteristics of differentapplications is good to improve the QoS guarantee in satellite networks. Thus, to solvethe problem that the traditional QoS guarantee schemes in satellite networks cannoteffectively take the QoS guarantee for emergency service business into considerationwhen supporting the QoS guarantee for daily service business at the same time, wepropose a QoS guarantee scheme for satellite networks considering emergency services.This scheme includes a queue scheduling scheme for satellite networks consideringemergency services and a service satisfaction oriented data flow admission controldecision-making scheme as its two parts. The main work is as follows:Firstly, this thesis concretely analyzes the real-time characteristics and QoSrequirements of several different typical business data streams in satellite networks,classify the main business in satellite networks, and give them different priorities inorder to provides the differentiated services.Secondly, to solve the problem that the traditional QoS guarantee schemes insatellite networks cannot effectively take the QoS guarantee for emergency servicebusiness into consideration when supporting the QoS guarantee for daily servicebusiness at the same time, this thesis designs and realizes a queue scheduling schemefor satellite networks considering emergency services. This scheme can effectively meetthe requirements of supporting daily services and taking into account emergencyservices, and can improve the utilization of network resources.Thirdly, in the background of the queue scheduling scheme for satellite networksconsidering emergency services, considering the moment when emergency servicebusiness starts to exist, its basic bandwidth resources are used again by emergencyservice business queue, so the actual bandwidth of the business customers businessqueue will suddenly have a greatly reduction, resulting in not enough to provide goodcommunication support for the total number of data flows at the same time. On thisbasis, based on the concept of application service satisfaction and unsatisfaction of service interrupting, this thesis designs and realizes a service satisfaction oriented dataflow admission control decision-making scheme. This scheme consists of the optimalalgorithm which is used when no data flows interrupted and the approximate optimalalgorithm which is used when any data flows interrupted.Finally, by simulation experiments, the performances of the queue schedulingscheme for satellite networks considering emergency services and the servicesatisfaction oriented data flow admission control decision-making scheme are tested.The results verify the effectiveness and superiority of the two schemes in bandwidthguarantee and bandwidth sharing and the solving of the admission controldecision-making optimization problem.