針對(duì)具有點(diǎn)波束的低軌衛(wèi)星移動(dòng)通信系統(tǒng)，提出了一種信道動(dòng)態(tài)預(yù)留策略。該策略不必記錄地面通信終端的實(shí)時(shí)位置，利用低軌衛(wèi)星通信系統(tǒng)中用戶移動(dòng)性特點(diǎn)，根據(jù)點(diǎn)波束間用戶分布情況即可實(shí)時(shí)計(jì)算出點(diǎn)波束內(nèi)應(yīng)預(yù)留的信道數(shù)。通過(guò)計(jì)算機(jī)仿真，本策略與固定信道預(yù)留策略相比較，可以動(dòng)態(tài)地調(diào)整小區(qū)預(yù)留的信道數(shù)，使系統(tǒng)的性能得到改善。
關(guān) 鍵 詞 低軌; 點(diǎn)波束; 動(dòng)態(tài); 信道預(yù)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