Method and apparatus for channel state information feedback in wireless communication system

摘要

The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for channel state information feedback. A method for a user equipment reporting channel state information in the wireless communication system, according to one embodiment of the present invention, comprises: receiving information on a CSI-reference signal (CSI-RS)-related parameter; receiving the CSI-RS on the basis of the CSI-RS-related parameter; and reporting to the base station CSI feedback information generated on the basis of the CSI-RS, wherein the CSI-RS-related parameter can be applied as a CSI-RS port or a port group unit, wherein an independent CSI-RS transmission power ratio indication parameter can be provided for each subframe set.

主权项

1. A method for reporting channel state information (CSI) by a user equipment (UE) in a wireless communication system, the method comprising:
receiving information on a CSI-reference signal (CSI-RS) related parameter that includes a scrambling seed value (XIDcell) a timing offset (Δns) and a parameter indicating a CSI-RS resource element position; receiving a CSI-RS on the basis of the CSI-RS related parameter; and reporting, to a base station (BS), CSI feedback information generated on the basis of the CSI-RS, wherein the CSI-RS related parameter is applied to one or more CSI-RS ports included in a single CSI-RS configuration, wherein the CSI-RS related parameter includes a plurality of ratio parameters indicating a first ratio of CSI-RS energy per resource element (EPRE) to physical downlink shared channel (PDSCH) EPRE per CSI-RS port, the first ratio being different from a second ratio of a cell-specific RS (CRS) EPRE to PDSCH EPRE, wherein the CSI feedback information is generated by compensating different power boosting levels of the CSI-RS ports based on the plurality of ratio parameters, and wherein an initial value (cinit) for the CSI-RS corresponds to an equation cinit=210·(7·(mod((ns+Δns),20)+1)+l+1)·(2·XIDcell+1)+2·XIDcell+NCP, where ns is a slot number in a radio frame, l is an OFDM symbol number in a slot, NCP is 1 in case of normal cyclic prefix (CP) and 0 in case of extended CP, and mod denotes a modulo operation.