Patent ID: 9577806
Date: 2017-02-21
CPC Classifications: H04B,H04J,H04L,H04W

Claim:
1. A method for transmitting channel state information-reference signals (CSI-RSs) for eight or less antenna ports, the method comprising: transmitting, to a receiving end, the CSI-RSs in a downlink subframe; and receiving, from the receiving end, channel state information (CSI) measured based on the CSI-RSs, wherein the CSI-RSs are mapped to one resource element (RE) group among a plurality of RE groups, each RE group includes a plurality of REs, and each RE is defined by one subcarrier in one orthogonal frequency division multiplexing (OFDM) symbol, wherein, in a resource region defined by 14 OFDM symbols and 12 subcarriers in the downlink subframe, each of the plurality of RE groups for eight antenna ports includes: wherein the first RE set is separated from the second RE set by four subcarriers.