Method for transmitting effective channel status information in wireless communication system supporting multiple carriers

摘要

A method and apparatus for transmitting effective channel status information (CSI) in a wireless communication system supporting multiple carriers are disclosed. The method for indicating CSI transmission in a wireless communication system supporting multiple carriers includes transmitting downlink control information (DCI) including a channel quality information (CQI) request field to a UE over a physical downlink control channel (PDCCH), and receiving CSI reporting of a single downlink carrier or multiple downlink carriers from the UE over a physical uplink shared channel (PUSCH) without receiving uplink data. If the CSI for the single downlink carrier is reported, the number (NPRB) of resource blocks (RBs) established for the CSI reporting is identical to or less than X (NPRB≦X), and if the CSI for the multiple downlink carriers is reported, NPRB is identical to or less than M (where M>X).

主权项

1. A method for indicating channel status information (CSI) transmission at a base station (BS) in a wireless communication system supporting multiple carriers, the method comprising:
transmitting downlink control information (DCI) including a CSI request field to a user equipment (UE) over a physical downlink control channel (PDCCH), the CSI request field having a length of 2 bits; and receiving CSI reporting for a single downlink carrier or CSI reporting for multiple downlink carriers from the UE over a physical uplink shared channel (PUSCH) without receiving uplink data, wherein the CSI reporting for the single downlink carrier is received if the CSI request field has a value of ‘01’ and a number (NPRB) of resource blocks (RBs) established for the CSI reporting is identical to or less than X (NPRB≦X), wherein the CSI reporting for the multiple downlink carriers is received if the CSI request field has a value ‘10’ or ‘11’ and the NPRB established for the CSI reporting is identical to or less than M (where M>X), and wherein a QPSK (Quadrature Phase Shift Keying) modulation scheme is applied to the CSI reporting for the single downlink carrier and the CSI reporting for the multiple downlink carriers.