Patent ID: 9544882
Date: 2017-01-10
CPC Classifications: H04L,H04W

Claim:
1. A method of transmitting channel status information (CSI) of a user equipment (UE) in a carrier aggregation system, the method comprising: receiving a higher layer signal comprising a bitmap from a base station (BS); receiving a downlink control information (DCI) format including a CSI request field from the BS, wherein a size of the CSI request field is 1 bit and a size of the bitmap is N bits, N being a natural number larger than 1; generating CSI for a specific downlink component carrier (DL CC), based on the bitmap, among N DL CCs which are configured for the UE when the CSI request field triggers a CSI reporting; and transmitting the generated CSI to the BS, wherein each bit of the bitmap is mapped to a corresponding one of the N DL CCs and indicates a DL CC for which CSI is generated.