CALL BLOCKING PERFORMANCE FOR DYNAMIC CHANNEL ALLOCATION TECHNIQUE INFUTURE MOBILE SATELLITE SYSTEMS

Different dynamic channel allocation (DCA) approaches based on the eva luation of a cost function are proposed. The scenario considered is lo w earth orbit and geostationary orbit mobile satellite systems. A suit able user mobility model has been defined to generate interbeam handov er requests. Different alternatives to manage interbeam handovers have been investigated. Among them, the most promising solution seems to b e the queuing of handover requests. The quality of service parameters that have been considered are: blocking probability for new call arriv als, handover failure probability and the probability of incompletely served call owing to the initial blocking or to the failure of a subse quent handover request. Comparisons among the proposed DCA techniques and the fixed channel allocation technique have been carried out to fi nd a solution that represents a good trade-off between the blocking pe rformance and the required signalling load.