Method of controlling transmit power of UE in wireless communication system and apparatus for the same

1. A method of transmitting a signal at a user equipment (UE) in a wireless communication system, the method comprising:

receiving a radio resource control (RRC) configuration message from a network, wherein the RRC configuration message comprises a first field that enables the UE to transmit to the network a preference value relating to power saving;

determining a first preference value relating to the power saving after receiving the RRC configuration message;

transmitting the determined first preference value relating to the power saving to the network, if a timer is not running; and

starting the timer upon transmitting to the network the determined first preference value relating to power saving.

2. The method of claim 1 , wherein the RRC configuration message is a RRC configuration enquiry message or a RRC reconfiguration message.

3. The method of claim 1 , wherein the determined first preference value relating to the power saving is transmitted using a RRC reconfiguration complete message or a RRC configuration response message.

4. The method of claim 1 , wherein the determined first preference value relating to the power saving is included in a second field of a response message of the RRC reconfiguration message.

5. The method of claim 4 , wherein the second field is a reason field.

6. The method of claim 4 , wherein the UE is in a RRC connected mode.

7. The method of claim 1 , wherein the first preference value relating to the power saving is based on an application which is being driven in the UE.

8. The method of claim 1 , wherein the first preference value relating to the power saving is based on latency required by an application which is being driven in the UE.

9. The method of claim 1 , wherein the timer defines a period during which the UE is prohibited from transmitting to the network the preference value relating to the power saving.

10. A method of receiving a signal at a network in a wireless communication system, the method comprising:

transmitting a radio resource control (RRC) configuration message to a user equipment (UE), wherein the RRC configuration message comprises a first field that enables the UE to transmit a preference value relating to power saving to the network; and

receiving a first preference value relating to the power saving from the UE after transmitting the RRC configuration message, wherein the first preference value relating to the power saving is received from the UE after the UE starts a timer, and wherein the timer is used for a transmission of the first preference value relating to the power saving if the timer is not running in order for the network to receive the first preference value relating to the power saving.

11. The method of claim 10 , wherein the RRC configuration message is a RRC configuration enquiry message or a RRC reconfiguration message.

12. The method of claim 10 , wherein the first preference value relating to the power saving is received using a RRC reconfiguration complete message or a RRC configuration response message.

13. The method of claim 10 , wherein the first preference value relating to the power saving is included in a second field of a response message of the RRC reconfiguration message.

14. The method of claim 13 , wherein the second field is a reason field.

15. The method of claim 13 , wherein the UE is in a RRC connected mode.

16. The method of claim 10 , wherein the first preference value relating to the power saving is based on an application which is being driven in the UE.

17. The method of claim 10 , wherein the first preference value relating to the power saving is based on latency required by an application which is being driven in the UE.

18. The method of according to claim 10 , wherein the timer defines a period during which the UE is prohibited from transmitting to the network the preference value relating to the power saving.