| 摘要 |
A communication method which uses a plurality of sub-carriers grouped in a sequence of chunks, the method includes receiving uplink data from one or more user devices and generating corresponding ACK/NACK messages for the received data, forming control data defining an allocation of one or more chunks of the sub-carriers for each of a plurality of user devices, transmitting the control data to the user devices, and transmitting the ACK/NACK messages to the corresponding user devices, wherein the control data for each user device is transmitted over a control channel using a first subset of the plurality of sub-carriers and the ACK/NACK messages for each user device are transmitted over an ACK/NACK channel that is separate from the control channel using a second different subset of the plurality of sub-carriers.
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