| 主权项 |
1. A method implemented by a base station of assigning resources on a downlink control channel to a group of acknowledgement channels for sending acknowledgement signals to a group of scheduled mobile terminals transmitting on an uplink traffic channel, said method comprising:
determining, by a scheduler of the base station, for each acknowledgement channel, a required transmit energy based on the channel conditions experienced by a corresponding mobile terminal assigned to the acknowledgement channel; assigning, by the scheduler, each acknowledgement channel to a channel group having at least one of a minimum number of channels and a minimum cumulative transmit energy, wherein:
acknowledgement channels in the same channel group share the same downlink resources;each channel group comprises the same number of resource elements; anda transmit power per resource element varies for channels in different channel groups and for at least two channels in the same channel group, wherein a resource element is a resource defined by one subcarrier over one symbol period; normalizing, by the scheduler, a total required transmit energy for all acknowledgement channels to a predetermined value when the total required transmit energy for all acknowledgement channels in all channel groups exceeds an available transmit power for the acknowledgement channels; and sending, by a retransmission controller of the base station, acknowledgment signals to the mobile terminals over the acknowledgement channels. |
