Method of reducing transmission power and terminal thereof

1. A method of reducing transmission power, the method performed by a user equipment and comprising: performing maximum power reduction (MPR) on maximum output power for transmission with non-contiguous resource allocation in a single component carrier; and transmitting a signal based on the MPR, wherein the MPR is performed differently depending on a resource allocation ratio A, wherein the resource allocation ratio A is defined as a ratio between N RB — agg and N RB — alloc , wherein the N RB — agg is a channel band represented as the number of resource blocks (RBs), and the N RB — alloc represents the total number of RBs simultaneously transmitted, wherein the MPR is determined according to a following equation: MPR=CEIL {M A , 0.5}, the CEIL is a function of rounding up by 0.5, and wherein the M A is a value determined according to following equations: M A =(8.0-10.12*A) when 0<A≦0.33, M A =(5.67-3.07*A) when 0.33<A≦0.77, and M A =(3.31) when 0.77<A≦1.0.

2. The method of claim 1 , further comprising; receiving information on an uplink resource allocated by a base station.

3. The method of claim 1 , wherein the uplink resource for transmission belongs to a specific class of an intra-band contiguous carrier aggregation (CA) band.

4. The method of claim 3 , wherein additional adjacent channel leakage ratio (ACLR) and spurious emission (SE) through network signaling performed from the base station are not defined with respect to the intra-band contiguous CA band.

5. The method of claim 1 , further comprising; receiving system information from the base station, wherein the system information contains at least one of information on an operating band, information on an uplink bandwidth and information on an uplink carrier frequency, and the information on the uplink bandwidth contains information on the number of RBs.

6. The method of claim 5 , wherein, if it is identified that the uplink resource for transmission belongs to the specific class of the intra-band contiguous CA band based on the system information, it is determined that the additional ACLR and SE are not defined by the network signaling.

7. The method of claim 5 , wherein, if it is identified that the uplink resource for transmission belongs to the specific class of the intra-band contiguous CA band based on the system information, it is determined not to consider the additional ACLR and SE received through the network signaling.

8. The method of claim 3 , wherein the maximum output power for the signal to be transmitted is defined according to the class of the intra-band contiguous CA band.

9. The method of claim 1 , wherein the value of MPR is defined in consideration of ACLR of an adjacent channel for UTRA, ACRL of an adjacent channel for E-UTRA, general spectrum emission mask (SEM) and general SE.

10. A terminal comprising: a controller configured to perform maximum power reduction (MPR) on maximum output power where multi cluster when transmission with non-contiguous resource allocation is performed in a single component carrier; and a transmitter configured to transmit a signal based on the MPR, wherein the MPR is performed differently depending on a resource allocation ratio A, wherein the resource allocation ratio A is defined as a ratio between N RB — agg and N RB — alloc , wherein the N RB — agg is a channel band represented as the number of resource blocks (RBs), and the N RB — alloc represents the total number of RBs simultaneously transmitted, wherein the MPR is determined according to a following equation: MPR=CEIL {M A , 0.5}, the CEIL is a function of rounding up by 0.5, and wherein the M A is a value determined according to following equations: M A =(8.0-10.12*A) when 0<A≦0.33, M A =(5.67-3.07*A) when 0.33<A≦0.77, and M A =(3.31) when 0.77<A≦1.0.

11. The terminal of claim 10 , further comprising; a receiver configured to receive at least one of information on an uplink resource allocated by a base station and system information.

12. The terminal of claim 10 , wherein the uplink resource for transmission belongs to a specific class of an intra-band contiguous CA band.

13. The terminal of claim 11 , wherein the system information contains at least one of information on an operating band, information on an uplink bandwidth and information on an uplink carrier frequency, and the information on the uplink bandwidth contains information on the number of RBs.

14. The terminal of claim 13 , wherein, if it is identified that the uplink resource for transmission belongs to the specific class of the intra-band contiguous CA band based on the system information, it is determined that the additional ACLR and SE are not defined by the network signaling.

15. The terminal of claim 13 , wherein, if it is identified that the uplink resource for transmission belongs to the specific class of the intra-band contiguous CA band based on the system information, it is determined not to consider the additional ACLR and SE received through the network signaling.

16. The terminal of claim 10 , wherein the maximum output power for the signal to be transmitted is defined according to the class of the intra-band contiguous CA band.

17. The terminal of claim 10 , wherein additional ACLR and SE through network signaling performed from the base station are not defined with respect to the intra-band contiguous CA band.

18. The terminal of claim 10 , wherein the value of MPR is defined in consideration of ACLR of an adjacent channel for UTRA, ACRL of an adjacent channel for E-UTRA, general SEM and general SE.