Patent ID: 9503236
Filing Date: 2016-11-22
CPC Classification: H04B,H04J,H04L,H04W

Claim Text:
1. A method for transmitting reference signals for eight or fewer antenna ports at a base station, the method comprising: transmitting, to a user equipment, common reference signals (CRSs) for four or fewer antenna ports and channel state information-reference signals (CSI-RSs) for the eight or fewer antenna ports; and receiving, from the user equipment, Channel State Information (CSI) estimated by the user equipment using the CSI-RSs, wherein a predetermined pattern for the CSI-RSs includes that the CSI-RSs are mapped to two orthogonal frequency division multiplexing (OFDM) symbols being separated by one OFDM symbol, and wherein the predetermined pattern for the CSI-RSs is allowed to be used only when the CRSs are configured for two or fewer antenna ports.