Method for receiving discovery reference signal by terminal in wireless communication system and device therefor

1. A method for receiving a discovery reference signal in a user equipment of a wireless communication system, the method comprising the steps of:

receiving discovery reference signal configuration information through an upper layer;

blind-detecting at least one discovery reference signal on the basis of the configuration information; and

transmitting and receiving a signal to and from a small cell corresponding to the detected at least one discovery signal and a serving cell,

wherein the discovery reference signal configuration information includes information on a candidate parameter set of the discovery reference signal,

wherein the candidate parameter set includes one antenna port index for blind detection of the discovery reference signal and frequency resource position information that may be detected by the discovery reference signal, and

wherein the frequency resource position information is expressed by a set of various kinds of resource position information corresponding to the antenna port index.

2. The method according to claim 1 , wherein the candidate parameter set includes, time resource position information that may be detected by the discovery reference signal, and a set of scrambling sequence initial values for blind detection of the discovery reference signal.

3. The method according to claim 2 , wherein the discovery reference signal is continuously transmitted from the small cell for a specific time resource to a plurality of time resources, and the time resource position information includes information on the specific time resource and information on the plurality of time resources.

4. The method according to claim 3 , wherein the information on the specific time resource indicates an offset value with a system frame number of the serving cell.

5. The method according to claim 2 , wherein the step of blind-detecting at least one discovery reference signal includes blind-detecting the discovery reference signal on the assumption that there is no legacy reference signal in a resource where the discovery reference signal is blind-detected.

6. The method according to claim 1 , wherein the step of transmitting and receiving a signal includes acquiring time/frequency synchronization with the small cell on the basis of the discovery reference signal.

7. A user equipment in a wireless communication system, the user equipment comprising:

a wireless communication module for transmitting and receiving a signal to and from a network; and

a processor for processing the signal,

wherein the processor:

blind-detects at least one discovery reference signal on the basis of discovery reference signal configuration information provided through an upper layer, and

controls the wireless communication module to transmit and receive a signal to and from a small cell corresponding to the detected at least one discovery signal and a serving cell, and

wherein the discovery reference signal configuration information includes information on a candidate parameter set of the discovery reference signal,

wherein the candidate parameter set includes one antenna port index for blind detection of the discovery reference signal and frequency resource position information that may be detected by the discovery reference signal, and

wherein the frequency resource position information is expressed by a set of various kinds of resource position information corresponding to the antenna port index.

8. The user equipment according to claim 7 , wherein the candidate parameter set includes time resource position information that may be detected by the discovery reference signal, and a set of scrambling sequence initial values for blind detection of the discovery reference signal.

9. The user equipment according to claim 8 , wherein the discovery reference signal is continuously transmitted from the small cell for a specific time resource to a plurality of time resources, and the time resource position information includes information on the specific time resource and information on the plurality of time resources.

10. The user equipment according to claim 9 , wherein the information on the specific time resource indicates an offset value with a system frame number of the serving cell.

11. The user equipment according to claim 8 , wherein the processor blind-detects the discovery reference signal on the assumption that there is no legacy reference signal in a resource where the discovery reference signal is blind-detected.

12. The user equipment according to claim 7 , wherein the processor acquires time/frequency synchronization with the small cell on the basis of the discovery reference signal.