Method and apparatus for requesting scheduling in cellular mobile communication system

1. A method for a terminal to transmit a scheduling request (SR) in a wireless communication system that supports carrier aggregation between a first base station and a second base station, comprising:

receiving information on transmission of the SR from the first base station and the second base station;

determining a destination base station to transmit the SR among the first base station and the second base station, based on at least one of a channel state between the terminal and each base station of the at least two or more base stations, a power headroom indicating available power by the terminal or a condition as to whether a cell-configuring carrier aggregation is activated, if a transmission of an uplink data is needed;

transmitting the SR to the first base station based on the information on transmission of the SR, if the destination base station is determined to be first base station; and

receiving scheduling control information from the second base station in response to transfer of the SR from the first base station to the second base station.

2. The method of claim 1 , wherein transmitting the SR to the first base station comprises:

transmitting the SR to the first base station, based on an uplink frequency of the first base station.

3. The method of claim 2 , further comprising:

after transmitting the SR, determining whether the scheduling control information is received on a downlink frequency corresponding to the second base station for a preset period of time; and

if the scheduling control information has not been received within the period of time, performing random access to the second base station.

4. The method of claim 2 , further comprising:

after transmitting the SR, determining whether the scheduling control information is received on a downlink frequency corresponding to the second base station for a preset period of time; and

if the scheduling control information has not been received within the period of time, transmitting the SR to the first base station.

5. The method of claim 1 , further comprising:

after transmitting the SR, determining whether scheduling control information is received on downlink frequencies that respectively correspond to the first base station and the second base station, for a preset period of time.

6. The method of claim 1 , further comprising:

receiving, from the second base station, information indicating whether the scheduling control information is transmitted on a downlink frequency corresponding to the second base station or on downlink frequencies corresponding to the first base station and the second base station.

7. The method of claim 1 , wherein receiving the scheduling control information comprises:

receiving, information for receiving the scheduling control information, when a backhaul delay between the first base station and the second base station is lower than a preset threshold; and

receiving, the scheduling control information based on the information for receiving the scheduling control information from the second base station, when the SR has transmitted from the first base station and the second base station.

8. A method for a terminal to transmit a scheduling request (SR) in a wireless communication system that supports carrier aggregation between a first base station and a second base station, comprising:

receiving information on resources for transmission of SR from the first base station and the second base station;

determining a destination base station to transmit the SR among the first base station and the second base station, based on at least one of a channel state between the terminal and each base station of the at least two or more base stations, a power headroom indicating available power by the terminal or a condition as to whether a cell-configuring carrier aggregation is activated, if a transmission of an uplink data is needed;

transmitting the SR to the first base station, on the resources corresponding to the first base station, if the destination base station is determined to be the first base station; and

receiving scheduling control information from the second base station in response to transfer of the SR from the first base station to the second base station.

9. The method of claim 8 , wherein the first base station and the second base station use the same uplink frequency and the same downlink frequency.

10. The method of claim 8 , wherein the information on resources for transmission of SR includes at least one of the following:

a transmission period of the SR, a timing offset within the transmission period of the SR, and a resource index of the SR.

11. The method of claim 8 , wherein receiving the scheduling control information comprises:

receiving, information for receiving the scheduling control information, when a backhaul delay between the first base station and the second base station is lower than a preset threshold; and

receiving, the scheduling control information based on the information for receiving the scheduling control information from the second base station, when the SR has transmitted from the first base station to the second base station.

12. A method for a first base station to transmit scheduling control information in a wireless communication system that supports carrier aggregation between the first base station and a second base station, comprising:

transmitting information on transmission of a scheduling request (SR) to a terminal;

receiving the SR determined based on the information on transmission of the SR from the terminal; and

transmitting the SR to the second base station based on information between the first base station and the second base station.

13. The method of claim 12 , wherein transmitting the SR comprises:

identifying a backhaul delay between the first base station and the second base station; and

transmitting the SR to the second base station for transmitting scheduling control information in response to the SR, when the backhaul delay is lower than a preset threshold.

14. A terminal for transmitting a scheduling request (SR) in a wireless communication system that supports carrier aggregation between a first base station and a second base station, comprising:

a transceiver configured to transmit/receive signals to/from the first base station and the second base station; and

a controller configured to:

control the transceiver to receive; information on transmission of SR, from the first base station and the second base station;

determine a destination base station to transmit the SR among the first base station and the second base station based on at least one of a channel state between the terminal and each base station, a power headroom indicating available power by the terminal or a condition as to whether a cell-configuring carrier aggregation is activated, if a transmission of an uplink data is needed;

control the transceiver to transmit the SR to the first base station based on the information on transmission of SR, if the destination base station is determined to be the first base station; and

control the transceiver to receive scheduling control information from the second base station in response to the transfer of the SR from the first base station to the second base station.

15. The terminal of claim 14 , wherein the controller is further configured to transmit the SR to the first base station based on an uplink frequency of the first base station.

16. The terminal of claim 15 , wherein the controller is further configured to determine, after transmitting the SR, whether the scheduling control information is received on a downlink frequency corresponding to the second base station for a preset period of time; and

perform, if the scheduling control information has not been received within the period of time, random access to the second base station.

17. The terminal of claim 15 , wherein the controller is further configured to determine, after transmitting the SR information, whether the scheduling control information is received on a downlink frequency corresponding to the second base station for a preset period of time; and

control the transmitter to transmit, if the scheduling control information has not been received within the period of time, the SR to the first base station.

18. The terminal of claim 14 , wherein the controller is further configured to determine, after transmitting the SR, whether scheduling control information is received on downlink frequencies that respectively correspond to the first base station and the second base station, for a preset period of time.

19. The terminal of claim 14 , wherein the controller is further configured to control the transceiver to receive, from the second base station, information indicating whether the scheduling control information is transmitted on a downlink frequency corresponding to the second base station or on downlink frequencies corresponding to the first base station and the second base station.

20. The terminal of claim 14 , wherein the controller is further configured to:

control the transceiver to receive information for receiving the scheduling control information, when a backhaul delay between the first base station and the second base station is lower than a preset threshold; and

control the transceiver to receive, the scheduling control information based on the information for receiving the scheduling control information from the second base station, when the SR has transmitted from the first base station to the second base station.

21. A first base station for transmitting scheduling control information in a wireless communication system that supports carrier aggregation between the first base station and a second base station, comprising:

a transceiver configured to transmit/receive signals to a terminal or the second base station;

a controller configured to:

control the transceiver to transmit information on transmission of a scheduling request (SR) to the terminal;

control the transceiver to receive, SR determined based on the information on transmission of the SR, from the terminal;

control the transceiver to transmit, the SR based on information between the first base station and the second base station, to the second base station.

22. The first base station of claim 21 , wherein the controller is further configured to:

identify a backhaul delay between the first base station and the second base station; and

control the transceiver to transmit the SR to the second base station for transmitting scheduling control information in response to the SR, when the backhaul delay is lower than a reset threshold.