Power headroom reporting method and device for wireless communication system

1. A method by a terminal in a wireless communication system, the method comprising:

receiving a configuration message to configure at least one uplink carrier;

triggering a power headroom report (PHR) for a first uplink carrier if a predetermined event occurs;

detecting an allocation of an uplink transmission resource for the PHR;

identifying whether the first uplink carrier for which a power headroom (PH) is to be determined is different from a second carrier to which the uplink transmission resource is allocated;

determining the PH based on a first pathloss associated with the first uplink carrier, if the first uplink carrier is different from the second carrier; and

transmitting the PHR generated based the determined PH.

2. The method of claim 1 , further comprising determining the PH based on a second pathloss associated with the second uplink carrier, if the first uplink carrier is not different from the second carrier.

3. The method of claim 1 , further comprising:

after receiving the configuration message, receiving a control message to activate the first uplink carrier;

determining whether a predetermined time has elapsed after receiving the control message; and

triggering the PHR, prior to receiving a message associated with the allocation of the uplink transmission resource, if the predetermined time has elapsed,

wherein the received message is associated with the first uplink carrier.

4. The method of claim 1 , further comprising:

determining whether the message is received when the PHR is triggered; and

if the message is received, calculating the PH of the PHR, generating the PHR using the calculated PH, and transmitting the generated PHR.

5. The method of claim 1 , further comprising, if the message is not received, continuing to await the allocation of an uplink transmission resource until the message is received.

6. A terminal in a wireless communication system, the terminal comprising:

a transceiver configured to transmit and receive a signal; and

a controller configured to

receive a configuration message to configure at least one uplink carrier,

trigger a power headroom report (PHR) for a first uplink carrier if a predetermined event occurs,

detect an allocation of an uplink transmission resource for the PHR,

identify whether the first uplink carrier for which a power headroom (PH) is to be determined is different from a second carrier to which the uplink transmission resource is allocated,

determine the PH based on a first pathloss associated with the first uplink carrier, if the first uplink carrier is different from the second carrier, and

transmit the PHR generated based the determined PH.

7. The terminal of claim 6 , wherein the controller is further configured to determine the PH based on a second pathloss associated with the second uplink carrier, if the first uplink carrier is not different from the second carrier.

8. The terminal of claim 6 , wherein the controller is further configured to

receive a control message to activate the first uplink carrier, after receiving the configuration message,

determine whether a predetermined time has elapsed after receiving the control message, and

trigger the PHR, prior to receiving a message associated with the allocation of the uplink transmission resource, if the predetermined time has elapsed,

wherein the received message is associated with the first uplink carrier.

9. The terminal of claim 6 , wherein the controller is further configured to

determine whether the message is received when the PHR is triggered,

calculate the PH of the PHR if the message is received,

generate the PHR using the calculated PH, and

transmit the generated PHR.

10. The terminal of claim 6 , wherein the controller is further configured to, if the message is not received, continue to await the allocation of an uplink transmission resource, until the message is received.