Motorola Corporation

Hechun Cai

Richard A Comroe

ShaoWei Wei Pan

Jinzhong Zhang

Chunyang Meng

Shao Wei Pan

Frank Fei Zhou

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.

Method and apparatus for assigning a remote unit a channel within a communication system

Preferred embodiments of a method and an apparatus for controlling power during a dispatch group call in a wireless communication system are described. A base station ( ) monitors for a transmission from a plurality of mobile stations ( ) via a first communication resource during a time period. The base station ( ) adjusts transmission power associated with a second communication resource based on the transmission from the plurality of mobile stations ( ) via the first communication resource. Further, the base station ( ) determines whether the transmission power associated with the second communication resource is above a transmission power threshold. In response to a failure to receive the transmission from the plurality of mobile stations ( ) via the first communication resource during the time period and a failure to detect the transmission power associated with the second communication resource being above the power threshold, the base station ( ) terminates transmissions to the plurality of mobile stations ( ) via the second communication resource.

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Vernon Hills, IL, United States of America

Hechun Cai