Patent ID: 9219590
Filing Date: 2015-12-22
Classification: H04B,H04L,H04W

Abstract:
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 (N wherein the CSI reporting for the multiple downlink carriers is received if the CSI request field has a value ‘10’ or ‘11’ and the N 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.