Leo Satellite Communication System Handover Technology and Channel Allocation Strategy

Satellite handover happens frequently in Low Earth Orbit (LEO) satellite network due to satellite’s high mobility. In this paper, we propose a novel call admission control scheme which utilizes both the geographical information and the distance between the new call’s position and the preparing handover user’s position in the previous plot beam to intelligently decide whether to block a new call to help avoid possible handover failure. An approximate analytical model is derived to estimate the new call blocking performance of the new scheme, which is verified by simulation results. Research results show that the new scheme can improve the new call blocking probability significantly while maintaining a zero handover call dropping probability seen with the time-based channel reservation algorithm (TCRA).