Patent ID: 8891470

Claim:
A method of transmitting, by a mobile station, feedback in a wireless communication system, the method comprising: receiving downlink control information from a base station, and transmitting event-driven feedback information to the base station on a first feedback channel, wherein the downlink control information comprises information about a short-term feedback period that is a short period in which feedback information is transmitted and information about a long-term feedback period that is a long period in which feedback information is transmitted, wherein the event-driven feedback information is transmitted based on the long-term feedback period, wherein the event-driven feedback information is transmitted at a point of time at which the short-term feedback information is transmitted right before or right after a point of time at which the long-term feedback information is transmitted, wherein a first feedback channel indicator transmitted on a second feedback channel indicates the first feedback channel, wherein the first feedback channel indicator is transmitted in each long-term feedback period, and wherein the first feedback channel indicator has a length of 1 bit.