Uplink power controlling method and uplink signal receiving method thereof

1. A method of receiving an uplink signal, the method comprising:

selecting receiving points in a Coordinated Multi-Point (CoMP) system;

transmitting CoMP setting information to User Equipment (UE); and

receiving uplink transmission from the UE, wherein uplink transmission power used for the uplink transmission is controlled based on an effective path loss calculated by using at least one of path losses between the UE performing the uplink transmission and points in the CoMP system,

wherein the CoMP setting information includes information regarding a number M of the receiving points, and wherein the effective path loss is calculated based on M path losses having a smallest value among path losses for points in the CoMP system.

2. The method of claim 1 , wherein the CoMP setting information includes information indicating the selected receiving points, and wherein the effective path loss is calculated based on path losses for the selected receiving points.

3. The method of claim 1 , wherein the CoMP setting information includes information regarding a path loss offset, and wherein the effective path loss is calculated based on a path loss having the smallest value among path losses for points in the CoMP system and path losses whose differences from the path loss having the smallest value are smaller than the path loss offset.

4. The method of claim 1 , wherein the CoMP setting information is included in downlink control information transmitted over Physical Downlink Control Channel (PDCCH).

5. The method of claim 1 , wherein the CoMP setting information is included in a Radio Resource Control (RRC) message and transmitted.

6. A method of controlling uplink power, the method comprising:

calculating path losses for transmission points in a Coordinated Multi-Point (CoMP) system;

calculating an effective path loss based on at least one of the path losses; and

performing uplink power control based on the effective path loss, wherein the effective path loss is calculated based on a predetermined number of reference path losses selected among the path losses,

wherein the reference path losses include a predetermined standard reference path loss selected among the path losses and path losses whose differences from the standard reference path loss are smaller than an offset indicated by a base station.

7. The method of claim 6 , wherein the reference path losses are path losses for receiving points indicated by the base station among the path losses.

8. The method of claim 6 , wherein the reference path losses are path losses selected by a number indicated by the base station among the path losses.

9. The method of claim 8 , wherein the reference path losses are path losses selected by a number indicated by the base station from among path losses having the smallest value of the path losses.

10. The method of claim 6 , wherein the predetermined standard reference path loss is a path loss having the smallest value among the path losses.

11. The method of claim 6 , wherein the reference path losses are selected by a number indicated by a predetermined parameter from among path losses having the smallest value of the path losses.

12. The method of claim 6 , wherein the reference path losses include a path loss having the smallest value among the path losses and path losses whose differences from the path loss having the smallest value are smaller than an offset indicated by a predetermined parameter.

13. The method of claim 6 , wherein information to select the reference path losses is transmitted from the base station through upper layer signaling or dynamic signaling.

14. An eNodeB (eNB) comprising:

a Coordinated Multi-Point (CoMP) scheduler to select receiving points in a CoMP system; and

a Radio Frequency (RF) transceiver to transmit CoMP setting information to User Equipment (UE) and to receive uplink transmission from the UE, wherein uplink transmission power used for the uplink transmission is controlled based on an effective path loss calculated by using at least one of path losses between the UE performing the uplink transmission and points in the CoMP system,

wherein the CoMP setting information includes information regarding a number M of the receiving points, and wherein the effective path loss is calculated based on M path losses having a smallest value among path losses for points in the CoMP system.

15. The eNB of claim 14 , wherein the CoMP setting information includes information indicating the selected receiving points, and wherein the effective path loss is calculated based on path losses for the selected receiving points.

16. A User Equipment (UE) comprising:

a path loss calculator to calculate path losses for transmission points in a Coordinated Multi-Point (CoMP) system and to calculate an effective path loss based on at least one of the path losses; and

a power controller to perform uplink power control based on the effective path loss, wherein the effective path loss is calculated based on a predetermined number of reference path losses selected among the path losses,

wherein the reference path losses include a predetermined standard reference path loss selected among the path losses and path losses whose differences from the standard reference path loss are smaller than an offset indicated by an eNodeB (eNB).

17. The UE of claim 16 , wherein the reference path losses are path losses for receiving points indicated by the eNB among the path losses.