METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATUS INFORMATION IN CARRIER AGGREGATION SYSTEM

摘要

Provided are a method and apparatus in which a terminal transmits channel status information in a carrier aggregation system. The method comprises the steps of: receiving, from a base station, an uplink grant containing a channel status information (CSI) request field; generating CSI related to a specific serving cell based on a bit value of the CSI request field; and transmitting the generated CSI to the base station via a first serving cell. If the CSI request field consists of 1 bit and the bit value of the CSI request field is '1', aperiodic CSI on the first serving cell is transmitted. If the CSI request field consists of 2 bits and is decoded in a terminal-specific search space, aperiodic CSI on the first serving cell is transmitted if the bit value of the CSI request field is '01', aperiodic CSI on a first serving cell set, which is set in an upper layer, is transmitted if the bit value of the CSI request field is '10', and aperiodic CSI on a second serving cell, which is set in an upper layer, is transmitted if the bit value of the CSI request field is '11'.