摘要
利用低轨卫星网格状结构光网络的空间对称性,推导了网络流量平衡特性,进而以最小丢包率为目标,采用Lagrange乘数法对各端口容量进行优化配置.在由m条轨道、每个轨道n颗卫星构成的Mesh型卫星光网络中,轨道内端口容量与m成反比,与对地接入端口速率比约为n/8;轨道间端口容量与n成反比,与对地接入速率比约为m/8.在初始配置下,丢包率在m=n时取得极小值;经优化配置之后,各端口利用率趋于平均,丢包率较优化前有明显下降,且随着卫星数量增加呈持续下降趋势.
The data-rates of transit ports and access ports in the homogeneous Mesh network consisting of low earth orbit（LEO） satellites were deduced based on the symmetrical characteristic of the network topology.According to the traffic,the capacities of the ports were optimized by the Lagrange multiplier method to minimize the packet lost ratio.In the network constituted by m orbit-planes with n satellites each,the capacities of intra-orbit ports should be inversely proportion to the orbit number m,approximately n/8 times of accessing data rates.The capacities of inter-orbit ports should be inversely proportion to the satellite number n in each orbit,approximately m/8 times of accessing date rates.Before optimization,the packet lost ratio was minimum when m=n.After optimization,the packet lost ratio is reduced and keeps decreasing as the total number of satellites increases.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2010年第12期2713-2717,共5页
Acta Electronica Sinica
基金
国家高技术研究发展计划(863计划)课题(No.2007AA01Z294)
陕西省自然科学基金(No.2009JQ8013)
