Research On Space Network QoS Assurance Technique For AOS Protocol

In order to meet the development needs of the increasingly complex space mission, The Consultative Committee for space data system(Consultive Committee for Space Data System, CCSDS) put forward Advanced Orbiting System(Advanced Oribiting Systems, AOS) protocol, which has become the factor standard international,which commonly used by the space countries. However, the space link environment is affected by long delay, bandwidth asymmetry, high bit error rate and so on, so it make challenge for how to provide Quality of Service assurance for satellite network AOS protocol.In this paper, study the current QoS of AOS protocol problems, propose a Qo S assurance method for AOS protocol, and the bandwidth guaranteed questions for asynchronous business priority changed has been detailed mathematical analysis, propose a hybrid priority bandwidth dynamic decision-making mechanism for AOS protocol,realize the AOS protocol in the Linux kernel,. The main work is as follows:Firstly, This article analyzes the AOS protocol eight kinds of business data flow characteristics and Qo S requirements, on this basis, put forward the layered QoS assurance methods, the network layer using DiffServ over AOS model, spa ce data link layer to redefine signal domain, which realizing the business classification mark and giving priority.Secondly, for AOS protocol synchronous and asynchronous services coexist, put forward QoS assurance mechanism for the AOS protocol. First, divide the AOS service queue priority and virtual channel, then using synchronous and asynchronous combination of scheduling policies, combined with ground Qo S assurance techniques, synchronization channels adopt WRR, asynchronous channels use PQ, not only can better support the synchronization between the services scheduling, but also can effectively protect the quality of service asynchronous services.Thirdly, on the basic of the Qo S assurance mechanisms of AOS protocol, asynchronous services priorities changd cause the needs of bandwidth changed, how to adjust bandwidth of other asynchronous services queue, we carry out detailed theory analysis,and built bandwidth guarantees mathematical model. Using dynamic theories to solve the problem. At last, put forward a dynamic priority bandwidth adaptive algorithm protocol for AOS protocol.Finally, we detailed design a new stack in the Linux kernel——AOS protocol stack, define the AOS protocol initial function, focuse on detailed designing description for the AOS protocol services data flow, make it become a module and add to the Linux kernel. At last,through point-to-point and single cycle experiments.