針對具有點波束的低軌衛(wèi)星移動通信系統(tǒng)，提出了一種信道動態(tài)預留策略。該策略不必記錄地面通信終端的實時位置，利用低軌衛(wèi)星通信系統(tǒng)中用戶移動性特點，根據(jù)點波束間用戶分布情況即可實時計算出點波束內(nèi)應預留的信道數(shù)。通過計算機仿真，本策略與固定信道預留策略相比較，可以動態(tài)地調(diào)整小區(qū)預留的信道數(shù)，使系統(tǒng)的性能得到改善。
關 鍵 詞 低軌; 點波束; 動態(tài); 信道預留

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