Radio communication system selectively using multicast with variable offset time

摘要

A digital base station improves downlink coverage by allocating multicast and non-multicast channels based on the propagation property of an RF link between a mobile unit and a base station. The non-multicast channels are time slots during which information is transmitted from one antenna, and multicast channels are time slots during which information is transmitted from multiple diversity antennas. Transmission timing is offset from the diversity antennas by an amount that corresponds to the multipath propagation properties of the RF link.