在低地球軌道衛(wèi)星通信系統(tǒng)中，可根據(jù)低地球軌道衛(wèi)星移動的特點，對信道預(yù)留策略加以改進(jìn)，使其以小區(qū)中業(yè)務(wù)量的大小動態(tài)的調(diào)整預(yù)留的信道數(shù)量，降低切換業(yè)務(wù)中斷概率。此外，將信道預(yù)留與新的到達(dá)業(yè)務(wù)排隊策略相結(jié)合，可以進(jìn)一步提高低地球軌衛(wèi)星移動通信系統(tǒng)的整體性能。It is well known that the Guard channel is an important method for the mobile communication systems, which can greatly improve the system performance by decreasing the probability of forced termination. Guard channel is hard to be adopted in the terrestrial communication system because of unpredicted traffics. We change the strategy based on the characters of LEO satellite and get a good performance. Moreover, the queuing of the new traffic has been taken to improve the performance of the whole LEO satellite communication system.