SCPS-TP协议用于LEO卫星网的性能分析与改进

SCPS-TP是空间通信传输协议,可用于卫星网络。为分析SCPS-TP在LEO卫星网中的性能和选择合适的拥塞避免机制,进行原理分析和仿真实验。在LEO卫星网中的典型时延和误比特率条件下,SCPS-TP协议采用Ve-gas机制比Van Jacobson机制能达到更好的性能。但LEO卫星网中存在的切换和路径改变情况会严重降低Vegas机制的性能。对此提出一种利用SCPS-NP包头信息感知路径变化和更新时延基准的改进方法,具有较好的可实现性。仿真结果表明,此举能明显提高SCPS-TP协议在LEO卫星网路径改变时的性能。

The Performance Analysis and Improvement of SCPS-TP in LEO Satellite Networks

SCPS-TP is a transport protocol for space communications,and it is suitable for satellite networks.Theory analysis and simulation experiments have been made to evaluate the performance of SCPS-TP in LEO satellite networks,so as to select the congestion avoidance mechanism.SCPS-TP with Vegas mechanism performs much better than with Van Jacobson at high bit errorrate and long delay.However,the handover and path change issuing from LEO satellite networks will degrade the performance of SCPS-TP with Vegas.A novel method of getting the path change information and updateing the delay base is proposed.Simulation results show that the method is validity and the performance of SCPS can be improved in LEO satellite networks.