一种用于宽带卫星通信网络的跨层星上缓存管理策略

为提高基于星上ATM(asynchronous transfer mode)交换的宽带卫星通信网络的星上缓存资源的利用率,针对非实时数据业务,提出了一种跨层星上缓存管理策略--错误信元尾丢弃ECTD(erroneous cell tail drop).该策略把由信道引起的错误信元及后续的属于同一协议数据单元的无效信元丢弃.基于系统仿真,采用Goodput和有效吞吐量两种性能评估指标分析了ECTD的性能.结果表明,ECTD提高了星上交换机的业务传递效率以及下行链路的利用率,其对有效吞吐量性能的提高大于Goodput性能的提高.

Cross-layer on-board buffer management strategy for broadband satellite communication networks

In order to improve the ut ilizat io n of o n-board buffer resour ces in broadband satell ite netwo rks w ith on-bo ar d ATM ( asynchro no us t ransfer mode) sw itching , a cross-layer on-bo ard buf fer manag ement st rategy , ECT D ( err oneous cell tail drop) , w hich concerns non-real-t ime data serv ices, w as sugg ested. The st rategy discar ds erroneo us cell s caused by satellite channel and the follow ing cells that belong to the same protoco l data unit . T wo perfo rmance evaluat ing met rics: Goodput and effect iv e throughput were adopted and ECTD w as analyzed thr oug h simulat ions. Result s show that ECT D improv es the tr ansferring eff iciency of on-bo ard sw itch and the utilizat ion of dow nload links and the improvement of ef fect ive thr oug hput is much g reater than that of Goodput .