Patent ID: 9614653
Date: 2017-04-04
CPC Classifications: H04J,H04L

Claim:
1. A method for performing Quasi Co-Location (QCL) for a second carrier by a User Equipment (UE) in a wireless access system, the method comprising: receiving a higher layer signal including a reference carrier indication indicating a reference carrier and a QCL reference Cell specific Reference Signal (CRS) information parameter indicating tracking reference signal (TRS) information of the reference carrier; receiving a Physical Downlink Control Channel (PDCCH) signal including a Physical Downlink Shared Channel (PDSCH) Resource Element (RE) Mapping and QCL Indicator (PQI) field, the PQI field indicating a QCL parameter set configured for the UE; receiving from the reference carrier a first PDSCH including a TRS, based on the TRS information indicated by the QCL reference CRS information parameter and the QCL parameter set indicated by the PQI field, wherein the TRS is quasi co-located with a CSI reference signal (CSI-RS) of the reference carrier according to a CSI-RS resource configuration; receiving from the second carrier a second PDSCH, including a corresponding CSI-RS, by applying large-scale properties obtained from the CSI-RS of the reference carrier, wherein the CSI-RS from the second carrier is quasi co-located with the TRS of the reference carrier; and performing time and frequency tracking between the reference carrier and the second carrier based on the CSI-RS received from the second carrier, wherein the TRS is used only for the time and frequency tracking, and the TRS is periodically transmitted in the reference carrier.