Connection admission control (CAC) and resources allocation (RA) on the up/down link (UDL) in a low Earth orbit (LEO) satellite constellation

We study a multi-service connection admission control (CAC) policy and we derive the corresponding resources allocation (RA) mechanism to access the up/down link (UDL) in a low Earth orbit (LEO) satellite constellation used as an access network to a mobile terrestrial network. We propose the usage of a trunk reservation policy for bandwidth reservation that allows the network to route the call on the satellite where the blocking probability is a minimum. In our study, we assume that the network handles three types of call: real time voice calls, non-real time data calls with guaranteed bandwidth and non-real time elastic data calls. A Markovian modelling approach is used to analyse the bandwidth occupation and derive the analytical model for the RA scheme.