Method for configuring reference signal for multi-antenna-based beamforming in wireless communication system and device for same
A method by which a base station transmits a reference signal to a terminal in a wireless communication system is disclosed. Particularly, the method comprises the steps of determining a reference signal resource interval expressed as a unit of one or more resource blocks (RBs), setting reference signal resources for a downlink bandwidth defined by a plurality of RBs, according to the reference signal resource interval, and transmitting the reference signal to the terminal by using the set reference signal resources, wherein the reference signal resource interval is determined on the basis of the number of reference signal antenna ports for which quasi co-location (QCL) can be assumed.
1. A method for transmitting a reference signal to a user equipment at a base station in a wireless communication system, the method comprising:
determining a reference signal resource interval expressed in a unit of one or more resource blocks (RBs) and an offset value indicating an index of a resource block in which the reference signal resource is configured firstly;
configuring reference signal resources for a downlink bandwidth defined by a plurality of RBs in accordance with the reference signal resource interval and the offset value; and
transmitting the reference signal to the user equipment by using the configured reference signal resources,
wherein configuring the reference signal resources comprises configuring the reference signal resources in accordance with the following Equation A:
k=M×m+O, <Equation A>
(where k is an index of the resource block in which the reference signal resource is configured, M is the reference signal resource interval, O represents the offset value, and m represents an index of the reference signal resources).
2. The method according to claim 1 , further comprising:
transmitting information on the offset value to the user equipment,
wherein the offset value is based on at least one of cell identity (ID) or a subframe number in which the reference signal is transmitted.
3. The method according to claim 1 , wherein m has a value of 0 to N RB −1, and N RB is a total number of the reference signal resource and is determined based on the downlink bandwidth.
4. The method according to claim 3 , wherein N RB is configured in accordance with the following Equation B:
N RB =└N RB DL /M┘ <Equation B>
(where N RB DL represents the downlink bandwidth).
5. The method according to claim 3 , wherein N RB is configured in accordance with the following Equation C:
N
RB
=
⌊
N
RB
DL
/
M
⌋
+
I
(
O
+
M
⌊
N
RB
DL
M
⌋
)
<
Equation
C
>
(where I(x) represents a function, which has a value of 1 if x is smaller than N RB DL and has a value of 0 if x is greater than N RB DL , and N RB DL represents the downlink bandwidth).