双层星座中负载均衡路由协议研究

提出了一种适用于双层结构卫星网络的负载均衡路由协议LBRD。不同于传统多层卫星路由，协议采用独立的地理位置路由作为同层卫星的基本选路策略，并以层间互补的方式提高路由成功率；在此基础上，为了均衡网络负载，采用邻间链路负载通告的方式，调节单颗卫星的负载；对于多颗过载卫星形成的区域，引入区域均衡机制，通过节点间距离变换，使原本经过该区域的数据流绕行，加速负载恢复。仿真结果表明，协议能够有效地均衡网络负载，减少因拥塞所导致的排队延迟与数据丢失，保证了网络吞吐量。

Load Balanced Routing Protocol for Double-Layered Satellite Networks

A load balanced routing protocol named LBRD is proposed for double-layered satellite networks. Unlike conventional hierarchical routing protocols, LBRD uses independent geographic routing within the same layer and takes another layer as a complement in case of route failure. To alleviate uneven traffic distribution, neighbor load notification for a single congested node is adopted, while a district load balanced scheme for the overloaded area formed by several nodes is introduced. Routing paths would detour heavily-loaded districts by transforming distance between nodes, accelerating load recovery of those districts. Simulation results show that this protocol yields a more balanced distribution of traffic over the constellation and brings down packet drop rate and queuing delay due to congestion, guaranteeing network throughput.