Resource reservation schemes for handover issue in LEO satellite systems

In this paper, we propose two channel reservation mechanisms called time-based channel reservation algorithm (TCRA) and TCRA with overbooking (TCRA-O). The aim of both algorithms is to handle the handover issue in low Earth orbit satellite networks. These systems are characterized by a high rate of handover attempts which can degrade significantly their performance. Therefore, we first propose TCRA, a scheme which guarantees a handover failure probability by using a channel reservation strategy in the cells to be crossed by the user. Secondly, we extend the mechanism into TCRA-O to take into account the call termination probability. Both mechanisms are compared to the GH (guaranteed handover) scheme previously proposed in the literature.