Footprint handover rerouting protocol for low Earth orbit satellite networks

Low Earth Orbit (LEO) satellite networks will be an integral part of the ne xt generation telecommunications infrastructures. In a LEO satellite networ k, satellites and their individual coverage areas move relative to a fixed observer on Earth. To ensure that ongoing calls are not disrupted as a resu lt of satellite movement, calls should be transferred or handed over to new satellites. Since two satellites are involved in a satellite handover, con nection route should be modified to include the new satellite into the conn ection route. The route change can be achieved by augmenting the existing r oute with the new satellite or by completely rerouting the connection. Rout e augmentation is simple to implement, however the resulting route is not o ptimal. Complete rerouting achieves optimal routes at the expense of signal ing overhead. In this paper, we introduce a handover rerouting protocol tha t maintains the optimality of the initial route without performing a routin g algorithm after intersatellite handovers. The FHRP makes use of the footp rints of the satellites in the initial route as the reference for rerouting . More specifically, after an optimum route has been determined during the call establishment process, the FHRP ensures that the new route due to hand over is also optimum. The FHRP demands easy processing, signaling, and stor age costs. The performance results show that the FHRP performs similar to a network without any handovers in terms of call blocking probability.