LEO卫星通信系统中的一种信道动态预留策略

针对具有点波束的低轨卫星移动通信系统，提出了一种信道动态预留策略。该策略不必记录地面通信终端的实时位置，利用低轨卫星通信系统中用户移动性特点，根据点波束间用户分布情况即可实时计算出点波束内应预留的信道数。通过计算机仿真，本策略与固定信道预留策略相比较，可以动态地调整小区预留的信道数，使系统的性能得到改善。
关 键 词 低轨; 点波束; 动态; 信道预留

Abstract A dynamic channel reserve strategy for LEO communication system with spot-beam is proposed. It does not need to record the location of the mobiles. Using the characteristic of mobile, we proposed a way to predict the number of channels those should be reserved in a spot-beam by the distribution of subscribers between spot-beams. The comparison between our strategy and the fixed channel reserve strategy through simulation shows that the former can automatically adjust the number of reserve channels, and improve the performance of the system.
Key words low earth orbit; spot-beam; dynamic; channel reserve