Method and apparatus for transmitting and receiving data using plurality of carriers in mobile communication system

1. A communication method of a user equipment (UE) in a dual connectivity (DC)-based mobile communication system in which a master cell group (MCG) and at least one secondary cell group (SCG) are configured, the method comprising:

receiving measurement gap configuration information relating to a measurement gap used to periodically measure at least one serving cell;

determining a first sub-frame included in the measurement gap using a system frame number (SFN) of the MCG and the received measurement gap configuration information; and

performing a measurement on the at least one serving cell during at least one measurement gap sub-frame determined based on the determined first sub-frame,

wherein the measurement gap starts at an ending point of a sub-frame that ends last among sub-frames that occur immediately before a measurement gap sub-frame of serving cells belonging to the MCG.

2. The method of claim 1 , wherein the measurement gap configuration information is received through a radio resource control (RRC) message and includes at least one of information specifying the first sub-frame and information indicating a repetition period of the measurement gap.

3. The method of claim 1 , wherein, hybrid automatic repeat request (HARQ) feedback, channel-quality indicator (CQI), channel state information (CSI), and sounding reference signal (SRS) are not transmitted in sub-frames included in the measurement gap.

4. The method of claim 2 , wherein the measurement gap is a measurement gap that is common to the MCG and the at least one SCG.

5. The method of claim 1 , wherein the first sub-frame is determined according to the following equations:

SFN mod T =FLOOR (gapOffset/10)

T =gap repetition period/10

subframe=gapOffset mod 10,

wherein subframe represents the first sub-frame, gapOffset is information specifying the first sub-frame, SFN is an SFN of the MCG, and gap repetition period is information indicating a repetition period of the measurement gap.

6. The method of claim 1 , wherein the MCG is a set of serving cells controlled by an eNB that controls a primary serving cell (PCell), and the at least one SCG is a set of serving cells not controlled by the eNB that controls the PCell.

7. A user equipment (UE) in a dual connectivity (DC)-based mobile communication system in which a master cell group (MCG) and at least one secondary cell group (SCG) are configured, the UE comprising:

a transceiver for transmitting and receiving data to and from at least one serving cell; and

a controller for analyzing measurement gap configuration information used in periodic measurement on the at least one serving cell, determining a first sub-frame included in a measurement gap, which is used to periodically measure the at least one serving cell, using a system frame number (SFN) of the MCG and the measurement gap configuration information, and controlling measurement on the at least one serving cell to be performed during at least one measurement gap sub-frame determined based on the determined first sub-frame,

wherein the measurement gap starts at an ending point of a sub-frame that ends last among su frames that occur immediately before a measurement gap sub-frame of serving cells belonging to the MCG.

8. The UE of claim 7 , wherein the measurement gap configuration information is received through a radio resource control (RRC) message and includes at least one of information specifying the first sub-frame and information indicating a repetition period of the measurement gap.

9. The UE of claim 7 , wherein hybrid automatic repeat request (HARQ) feedback, channel-quality indicator (CQI), channel state information (CSI), and sounding reference signal (SRS) are not transmitted in sub-frames included in the measurement gap.

10. The UE of claim 7 , wherein the measurement gap is a measurement gap that is common to the MCG and the at least one SCG.

11. The UE of claim 7 , wherein the first sub-frame is determined according to the following equations:

SFN mod T =FLOOR (gapOffset/10)

T =gap repetition period/10

subframe=gapOffset mod 10,

wherein subframe represents the first sub-frame, gapOffset is information specifying the first sub-frame, SFN is an SFN of the MCG, and gap repetition period is information indicating a repetition period of the measurement gap.

12. A communication method of an eNB in a dual connectivity (DC)-based mobile communication system in which a master cell group (MCG) and at least one secondary cell group (SCG) are configured, the method comprising:

determining a measurement gap used for periodic measurement of a user equipment (UE) on at least one serving cell;

transmitting measurement gap configuration information used to determine a first sub-frame included in the measurement gap to the UE, the first sub-frame is determined based on a system frame number (SFN) of the MCG and the measurement gap configuration information; and

one of transmitting and receiving data to and from the UE,

wherein data transmission and reception to and from the UE is not performed during the measurement gap, and

wherein the measurement gap starts at an ending point of a sub-frame that ends last among sub-frames that occur immediately before a measurement gap sub-frame of serving cells belonging to the MCG.

13. The method of claim 12 , wherein the measurement gap configuration information is received through a radio resource control (RRC) message and includes at least one of information specifying the first sub-frame and information indicating a repetition period of the measurement gap.

14. The method of claim 13 , wherein the measurement gap is a measurement gap that is common to the MCG and the at least one SCG.

15. The method of claim 12 , wherein the first sub-frame is determined according to the following equations:

SFN mod T =FLOOR (gapOffset/10)

T =gap repetition period/10

subframe=gapOffset mod 10,

wherein subframe represents the first sub-frame, gapOffset is information specifying the first sub-frame, SFN is an SFN of the MCG, and gap repetition period is information indicating a repetition period of the measurement gap.

16. The method of claim 12 , wherein the MCG is a set of serving cells controlled by an eNB that controls a primary serving cell (PCell), and the at least one SCG is a set of serving cells not controlled by the eNB that controls the PCell.

17. An eNB in a dual connectivity (DC)-based mobile communication system in which a master cell group (MCG) and at least one secondary cell group (SCG) are configured, the eNB comprising:

a transceiver for transmitting and receiving data to and from a user equipment (UE); and

a controller for analyzing a measurement gap used for periodic measurement of the UE on at least one serving cell and measurement gap configuration information used to determine a first sub-frame included in the measurement gap to be transmitted to the UE,

wherein the first sub-frame is determined based on a system frame number (SFN) of the MCG and the measurement gap configuration information,

wherein data transmission and reception to and from the UE is not performed during the measurement gap,

wherein, hybrid automatic repeat request (HARQ) feedback, channel-quality indicator (CQI), channel state information (CSI), and sounding reference signal (SRS) are not transmitted in sub-frames included in the measurement gap, and

wherein the measurement gap starts at an ending point of a sub-frame that ends last among sub-frames that occur immediately before a measurement gap sub-frame of serving cells belonging to the MCG.

18. The eNB of claim 17 , wherein the measurement gap configuration information is received through a radio resource control (RRC) message and includes at least one of information specifying the first sub-frame and information indicating a repetition period of the measurement gap.

19. The eNB of claim 18 , wherein the measurement gap is a measurement gap that is common to the MCG and the at least one SCG.

20. The eNB of claim 17 , wherein the first sub-frame is determined according to the following equations:

SFN mod T =FLOOR (gapOffset/10)

T =gap repetition period/10

subframe=gapOffset mod 10,

wherein subframe represents the first sub-frame, gapOffset is information specifying the first sub-frame, SFN is an SFN of the MCG, and gap repetition period is information indicating a repetition period of the measurement gap.