Patent ID: 8737253

Claim:
A method of periodic transmitting channel status information in a multi-carrier wireless communication system, the method comprising: receiving, at a receiver, a signal transmitted on N (N≧2) carriers from a transmitter to the receiver; determining, at the receiver, channel status information of the N carriers based on the received signal; and transmitting, on M (1≦M≦N) carriers from the receiver to the transmitter, the channel status information of the N carriers, wherein the channel status information of the N carriers are transmitted according to respective channel status information reporting periods and channel status information reporting period offsets of the N carriers, wherein the channel status information includes at least one of a channel quality indicator (CQI), a precoding matrix index (PMI) or a rank indicator (RI), wherein RIs of the N carriers are transmitted at a same timing, and at least one of CQIs or PMIs of the N carriers are transmitted at different timings.