A communication system includes a satellite and a ground station. The satellite is configured to preferentially receive signals from each of a plurality of sub-regions within a region of communication of the satellite. The ground station is configured to determine a location of the ground station, determine in which of the sub-regions that the ground station resides based on the location, and transmit a signal to the satellite during a time-interval assigned to the sub-region. The ground stations time-multiplex the transmission of signals from various ground stations to the satellite based on which sub-region of the larger region (e.g. the continental United States or CONUS) that the ground station resides. The time multiplexing is such that ground stations in one region are not transmitting signals to the satellite during the same time interval as ground stations in adjacent sub-regions.