CAJ | 학술논문

According to low earth orbit (LEO) satel ite systems with users of different levels, a dynamic channel reservation scheme based on priorities is proposed. Dynamic calculation of the thresh-olds for reserved channels is the key of this strategy. In order to obtain the optimal thresholds, the traffic is predicted based on the high-speed deterministic movement property of LEO satel ites firstly. Then, a channel al ocation model based on Markov is es-tablished. Final y, the solution of the model is obtained based on the genetic algorithm. Without user location, this strategy effec-tively reduces handover failures and improves channel utilization by adjusting dynamical y the thresholds according to traffic condi-tions. The simulation results show that the system’s overal quality of service can be improved by this strategy.