FIELD: radio engineering, communication.
SUBSTANCE: invention relates to communication systems. A base station sets a CSI request field of an Uplink (UL) grant for scheduling UL transmission on a UL Component Carrier (CC) corresponding to a Downlink (DL) CC of which CSI is requested, to a request value. The UL grant is transmitted to a terminal.
EFFECT: improved Channel State Information (CSI) request/feedback for a wireless communication system which supports carrier aggregation or bandwidth extension.
40 cl, 15 dwg
