Motorola Corporation

Chunyang Meng

Richard A Comroe

ShaoWei Wei Pan

Jinzhong Zhang

Hechun Cai

In accordance with the preferred embodiment of the present invention all remote units () participating in a group call can actively transmit uplink communications to their respective base stations () via low-data rate traffic channels (). The remote units having the highest transmit energies are summed and broadcast to all remote units () participating in the group call. Because only those remote units having the highest transmit energies are summed and broadcast, network congestion is greatly reduced.

Method and apparatus for multicasting in a wireless communication system

During a group call, each remote unit () receives a downlink supplemental transmission () that contains high-speed data (e.g., video). A single supplemental channel is utilized for each base station (). On the uplink side, the supplemental channel is shared among all remote units, however only one remote unit () 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 ()) to all other remote units participating in the multicast.

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Lake Zurich, IL, United States of America

Chunyang Meng