Method for control channel transmission with persistent scheduling
A method is provided for multiplexing control information with persistently scheduled data in a spectrally efficient operation. In particular, the invention operates to determine and send a power offset parameter in a message carrying a persistent data allocation from a base station to a corresponding mobile station. The power offsets are related to the control information being sent, and specify the amount by which the mobile should increase its transmit power level when multiplexing particular control information together with the persistent data. The increased transmit power then operates to maintain the required QoS on the data channel.
1 . A method for operating a wireless communication system comprising the steps of:
determining a power offset to be used by a mobile unit in the wireless system for transmission of control information together with data; and
signaling the power offset from a base station to the mobile unit.
2 . The method of claim 1 where the data to be transmitted by the mobile unit is persistently scheduled by the base station.
3 . The method of claim 2 where the signaled power offset is carried in a message from the base station carrying the persistent scheduling.
4 . The method of claim 1 where the control information corresponds to ACK/NACK, CQI, or ACK/NACK+CQI.
5 . The method of claim 1 where the power offset is determined to improve a SNR at the base station such that the same quality of service is maintained for the mobile transmission as for the transmission of only data.
6 . The method of claim 1 where a format of the control information is modified as a function of the power offset.
7 . The method of claim 6 wherein the format of the control information includes a repetition factor.