Patent ID: 9118386
Filing Date: 2015-08-25
Classification: H04B,H04L,H04W

Abstract:
1. A method for transmitting reference signals via relay nodes in relay communication system, the method performed by a base station (BS) and comprising: allocating a plurality of antenna ports in a mutually exclusive manner to the BS and the relay nodes such that first antenna ports allocated only to the BS are not overlapped with second antenna ports allocated only to the relay nodes and the second antenna ports are commonly allocated to the relay nodes in an overlapping manner; transmitting a CRS (Common Reference Signal) and a PDCCH (Physical Downlink Control Channel) using the first antenna ports; transmitting a CSI-RS (Channel State Information-Reference Signal) via the relay nodes using the second antenna ports; obtaining first channel state information between the BS and a terminal via the first antenna ports; and obtaining second channel state information between the relay nodes and the terminal via the second antenna ports, wherein the first and second channel state information is received from the terminal.