Research Of Resource Management And Access Technology Based On Satellite Network

With the increasing number of multimedia services on the ground,the bandwidth and speed requirements for satellites are also increasing.Limited resources on satellite can not keep up with the rapid development of services.Satellite network resource management has become a hot issue at present.An Efficient resource management strategy can improve the utilization rate of wireless resources,avoid network congestion and keep the signaling load as small as possible,provide more users with high-quality communication services as well.LEO satellite network,multi-star coverage is high,in the multi-satellite coverage satellite access is selected satellite access strategy needs to be addressed,a reasonable access strategy to improve user communication quality,reduce congestion,reduce dropped calls,the traditional satellite Access strategy only consider unilateral factors,unable to meet the access needs,so the satellite access strategy remains to be studied.Traditional satellite communication systems do not have the on-board switching function.Although the communication delay is small and the equipment is simple,the bit error rate is high and can not meet the communication needs of the multimedia service.The adoption of the on-board switching can reduce the dependence of the multi-terrestrial system while significantly Reduce the error rate,the exchange of stars is the future direction of satellite network development.Based on the research of satellite network resource management technology,the thesis studies the cross-layer dynamic bandwidth allocation algorithm.Based on the research of satellite network access technology,the satellite access strategy based on synthetic weighted strategy is studied emphatically.Based on the research of on-board switching technology,the algorithm of on-air optical burst switching data channel scheduling based on QoS and length threshold is studied.The main research work is as follows:1)Based on the study of satellite dynamic bandwidth allocation and cross-layer design,a cross-layer dynamic bandwidth allocation strategy based on convex optimization theory is proposed.Considering the physical layer and application layer,a cross-layer dynamic bandwidth allocation model and utility function The model is solved based on convex optimization theory.The simulation results show that the proposed algorithm can improve the system utility and ensure the fairness of user bandwidth allocation.2)On the basis of further research on satellite network access technology,aiming at the satellite access problem under the multi-satellite coverage of LEO satellite network,this paper proposes a satellite access strategy based on comprehensive weighting strategy,which is based on the satellite access strategy of distance,elevation,coverage time and idleness The number of channels is also taken into account.The simulation results show that the proposed access strategy can reduce blocking rate and dropped call rate.3)On the basis of studying on-the-satellite exchange technology,aiming at the business burst characteristic of satellite communication system,the optical burst exchange is applied to the on-the-satellite exchange,and the on-chip optical burst-switching data channel based on QoS and length threshold is proposed Scheduling algorithm.The simulation results show that the proposed algorithm can guarantee the QoS better than the traditional LAUC,LAUC-VF and FF,and reduce the delay and packet loss rate.