During a group call, each remote unit (113-118) receives a downlink
supplemental transmission (109-110) that contains high-speed data (e.g.,
video). A single supplemental channel is utilized for each base station (101-102).
On the uplink side, the supplemental channel is shared among all remote units,
however only one remote unit (113-118) is allowed to transmit at a time
utilizing the uplink supplemental channel. A decision is made as to which remote
unit is providing a highest-voice-energy fundamental channel uplink, and that remote
unit is assigned the uplink supplemental channel. The remote unit, that is currently
transmitting utilizing the uplink supplemental channel, has its transmission broadcast
(via downlink supplemental channels (109-110)) to all other remote units
participating in the multicast.