Apparatus and method for controlling a hybrid automatic repeat request operation in a wireless mobile communication system

1. A method for controlling a Hybrid Automatic Repeat reQuest (HARQ) operation in a transmitter of a wireless mobile communication system using each frame constituted by a plurality of subframes, the method comprising:

transmitting indication information, indicating a subframe position where transmission of a data burst starts and the number of subframes required for transmission of the data burst, to a receiver through an i-th frame;

determining to retransmit the data burst at the subframe position indicated by indication information of an (i+1)-th frame to the receiver when the number of subframes does not exceed a threshold; and

determining to retransmit the data burst at the subframe position indicated by indication information of an (i+n)-th frame to the receiver, where n is a positive integer exceeding 1, when the number of subframes exceeds the threshold.

2. The method of claim 1 , further comprising:

transmitting a determination result to the receiver.

3. The method of claim 1 , further comprising:

exchanging information about capabilities of the transmitter and receiver between the transmitter and receiver; and

setting, by the transmitter, the threshold by considering the capabilities of the transmitter and receiver.

4. The method of claim 3 , wherein the information about capabilities of the transmitter and receiver comprises at least one of channel coding, Multiple-Input Multiple-Output (MIMO), and HARQ schemes capable of being supported by the transmitter and receiver.

5. The method of claim 4 , further comprising:

determining to retransmit the data burst at the subframe position indicated by the indication information of the (i+n)-th frame to the receiver when the number of subframes does not exceed the threshold and at least one of the capabilities of the transmitter and receiver does not support retransmission of the data burst at the subframe position indicated by the indication information of the (i+1)-th frame.

6. The method of claim 5 , wherein the information about the capability of the transmitter comprises a transmission processing time taken to detect a feedback signal for a data burst transmitted in an i-th frame from the receiver and prepare retransmission of the data burst, and

the information about the capability of the receiver comprises a reception processing time taken to receive a data burst transmitted in an i-th frame from the transmitter and transmit a feedback signal for the data burst.

7. The method of claim 1 , wherein, according to at least one of a Frequency Division Duplex (FDD) scheme, a Time Division Duplex (TDD) scheme, and a Half-duplex FDD (HFDD) scheme to be used in the wireless mobile communication system, the threshold is determined by:

DL

UL

L max

TTI threshold

L max

TTI threshold

FDD

F

Ceil (F/2) − T RX

F

Floor(F/2) − T RX

TDD M:N

M − m

M − m + n m − T RX

N − n

N − n + m n − T RX

HFDD

DU

M − m

M − m + (n m − M) − T RX =

N − n

N − (n − M) + m n − T RX

M:N

−m + n m − T RX

UD

N − m

N − (m − M) + n m − T RX

M − n

M − n + (m n − N) −

T RX

where F denotes the number of subframes constituting one frame, M denotes the number of subframes constituting a DownLink (DL) frame and N denotes the number of subframes constituting an UpLink (UL) frame in a TDD communication system and an HFDD Downlink and Uplink (DU) communication system, DU denotes a frame structure in which a UL frame is arranged after a DL frame in time in an HFDD communication system, M denotes the number of subframes constituting a UL frame and N denotes the number of subframes constituting a DL frame in an HFDD Uplink and Downlink (UD) communication system, UD denotes a frame structure in which a DL frame is arranged after a UL frame in time in the HFDD communication system, m denotes a DL subframe index in which data burst transmission starts, m n denotes a subframe index m in which at least one of ACK and NACK for data burst transmission started in a No. n subframe is transmitted, n m denotes a subframe index n in which at least one of ACK and NACK for data burst transmission started in a No. m subframe is transmitted, and T RX denotes the number of subframes required for a reception processing time.

8. A method for controlling a Hybrid Automatic Repeat reQuest (HARQ) operation in a receiver of a wireless mobile communication system using each frame constituted by a plurality of subframes, the method comprising:

receiving indication information, indicating a subframe position where transmission of a data burst starts and the number of subframes required for transmission of the data burst, from a transmitter through an i-th frame;

determining to receive the data burst retransmitted at the subframe position indicated by indication information of an (i+1)-th frame from the transmitter when the number of subframes does not exceed a threshold; and

determining to receive the data burst retransmitted at the subframe position indicated by indication information of an (i+n)-th frame from the transmitter, where n is a positive integer exceeding 1, when the number of subframes exceeds the threshold.

9. The method of claim 8 , further comprising:

receiving information of a frame in which the data burst is retransmitted from the transmitter; and

determining to receive a data burst retransmitted at the subframe position indicated by indication information of a corresponding frame according to the received information.

10. The method of claim 8 , further comprising:

exchanging information about capabilities of the transmitter and receiver between the transmitter and receiver; and

setting, by the receiver, the threshold by considering the capabilities of the transmitter and receiver.

11. The method of claim 10 , wherein the information about the capabilities of the transmitter and receiver comprise at least one of channel coding, Multiple-Input Multiple-Output MIMO, and HARQ schemes capable of being supported by the transmitter and receiver.

12. The method of claim 11 , further comprising:

determining to receive the data burst retransmitted at the subframe position indicated by the indication information of the (i+n)-th frame from the transmitter when the number of subframes does not exceed the threshold and at least one of the capabilities of the transmitter and receiver does not support retransmission of the data burst at the subframe position indicated by the indication information of the (i+1)-th frame.

13. The method of claim 12 , wherein the information about the capability of the transmitter comprises a transmission processing time taken to detect a feedback signal for a data burst transmitted in an i-th frame from the receiver and prepare retransmission of the data burst, and

the information about the capability of the receiver comprises a reception processing time taken to receive a data burst transmitted in an i-th frame from the transmitter and transmit a feedback signal for the data burst.

14. The method of claim 8 , wherein, according to at least one of a Frequency Division Duplex (FDD), a Time Division Duplex (TDD), and a Half-duplex FDD (HFDD) scheme to be used in the wireless mobile communication system, the threshold is determined by:

DL

UL

L max

TTI threshold

L max

TTI threshold

FDD

F

Ceil(F/2) − T RX

F

Floor(F/2) − T RX

TDD M:N

M − m

M − m + n m − T RX

N − n

N − n + m n − T RX

HFDD

DU

M − m

M − m + (n m − M) − T RX =

N − n

N − (n − M) + m n − T RX

M:N

−m + n m − T RX

UD

N − m

N − (m − M) + n m − T RX

M − n

M − n + (m n − N) −

T RX

where F denotes the number of subframes constituting one frame, M denotes the number of subframes constituting a DL frame and N denotes the number of subframes constituting a UL frame in a TDD communication system and an HFDD DU communication system, DU denotes a frame structure in which a UL frame is arranged after a DL frame in time in an HFDD communication system, M denotes the number of subframes constituting a UL frame and N denotes the number of subframes constituting a DL frame in an HFDD UD communication system, UD denotes a frame structure in which a DL frame is arranged after a UL frame in time in the HFDD communication system, m denotes a DL subframe index in which data burst transmission starts, m n denotes a subframe index m in which at least one of ACK and NACK for data burst transmission started in a No. n subframe is transmitted, n m denotes a subframe index n in which at least one of ACK and NACK for data burst transmission started in a No. m subframe is transmitted, and T RX denotes the number of subframes required for a reception processing time.

15. A transmitter for controlling a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system using each frame constituted by a plurality of subframes, the transmitter comprising:

a data burst transmission information generator for generating indication information indicating a subframe position where transmission of a data burst starts and the number of subframes required for transmission of the data burst and for transmitting the indication information to a receiver through an i-th frame; and

a controller for determining to retransmit the data burst at the subframe position indicated by indication information of an (i+1)-th frame to the receiver when the number of subframes does not exceed a threshold, and for determining to retransmit the data burst at the subframe position indicated by indication information of an (i+n)-th frame to the receiver, where n is a positive integer exceeding 1, when the number of subframes exceeds the threshold.

16. The transmitter of claim 15 , wherein the controller transmits a determination result to the receiver.

17. The transmitter of claim 15 , wherein the data burst transmission information generator exchanges information about capabilities of the transmitter and receiver between the transmitter and receiver, and the transmitter sets the threshold by considering the capabilities of the transmitter and receiver.

18. The transmitter of claim 17 , wherein the information about the capabilities of the transmitter and receiver comprise at least one of channel coding, Multiple-Input Multiple-Output (MIMO), and HARQ schemes capable of being supported by the transmitter and receiver.

19. The transmitter of claim 18 , wherein the controller determines to retransmit the data burst at the subframe position indicated by the indication information of the (i+n)-th frame to the receiver when the number of subframes does not exceed the threshold and at least one of the capabilities of the transmitter and receiver does not support retransmission of the data burst at the subframe position indicated by the indication information of the (i+1)-th frame.

20. The transmitter of claim 19 , wherein the information about the capability of the transmitter comprises a transmission processing time taken to detect a feedback signal for a data burst transmitted in an i-th frame from the receiver and prepare retransmission of the data burst, and

the information about the capability of the receiver comprises a reception processing time taken to receive a data burst transmitted in an i-th frame from the transmitter and transmit a feedback signal for the data burst.

21. The transmitter of claim 15 , wherein, according to at least one of a Frequency Division Duplex (FDD), a Time Division Duplex (TDD), and a Half-duplex FDD (HFDD) scheme to be used in the wireless mobile communication system, the threshold is determined by:

DL

UL

L max

TTI threshold

L max

TTI threshold

FDD

F

Ceil(F/2) − T RX

F

Floor(F/2) − T RX

TDD M:N

M − m

M − m + n m − T RX

N − n

N − n + m n − T RX

HFDD

DU

M − m

M − m + (n m − M) − T RX =

N − n

N − (n − M) + m n − T RX

M:N

−m + n m − T RX

UD

N − m

N − (m − M) + n m − T RX

M − n

M − n + (m n − N) −

T RX

where F denotes the number of subframes constituting one frame, M denotes the number of subframes constituting a DL frame and N denotes the number of subframes constituting a UL frame in a TDD communication system and an HFDD DU communication system, DU denotes a frame structure in which a UL frame is arranged after a DL frame in time in an HFDD communication system, M denotes the number of subframes constituting a UL frame and N denotes the number of subframes constituting a DL frame in an HFDD UD communication system, UD denotes a frame structure in which a DL frame is arranged after a UL frame in time in the HFDD communication system, m denotes a DL subframe index in which data burst transmission starts, m n denotes a subframe index m in which at least one of ACK and NACK for data burst transmission started in a No. n subframe is transmitted, n m denotes a subframe index n in which at least one of ACK and NACK for data burst transmission started in a No. m subframe is transmitted, and T RX denotes the number of subframes required for a reception processing time.

22. A receiver for controlling a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system using each frame constituted by a plurality of subframes, the receiver comprising:

a data burst transmission information reader for reading indication information indicating a subframe position where transmission of a data burst starts and the number of subframes required for transmission of the data burst from a transmitter through an i-th frame and for outputting a read result;

a comparator for comparing the number of subframes with a threshold and for outputting a comparison result; and

a controller for determining to receive the data burst retransmitted at the subframe position indicated by indication information of an (i+1)-th frame from the transmitter when the number of subframes does not exceed the threshold, and for determining to receive the data burst retransmitted at the subframe position indicated by indication information of an (i+n)-th frame from the transmitter, where n is a positive integer exceeding 1, when the number of subframes exceeds the threshold.

23. The receiver of claim 22 , wherein, when receiving information of a frame in which the data burst is retransmitted from the transmitter, the controller determines to receive a data burst retransmitted at the subframe position indicated by indication information of a corresponding frame according to the received information.

24. The receiver of claim 22 , further comprising:

a threshold determiner for exchanging information about capabilities of the transmitter and receiver between the transmitter and receiver and for setting the threshold by considering the capabilities of the transmitter and receiver.

25. The receiver of claim 24 , wherein the information about the capabilities of the transmitter and receiver comprise at least one of channel coding, Multiple-Input Multiple-Output (MIMO), and HARQ schemes capable of being supported by the transmitter and receiver.

26. The receiver of claim 25 , wherein the controller determines to receive the data burst retransmitted at the subframe position indicated by the indication information of the (i+n)-th frame from the transmitter when the number of subframes does not exceed the threshold and at least one of the capabilities of the transmitter and receiver does not support retransmission of the data burst at the subframe position indicated by the indication information of the (i+1)-th frame.

27. The receiver of claim 26 , wherein the information about the capability of the transmitter comprises a transmission processing time taken to detect a feedback signal for a data burst transmitted in an i-th frame from the receiver and prepare retransmission of the data burst, and

the information about the capability of the receiver comprises a reception processing time taken to receive a data burst transmitted in an i-th frame from the transmitter and transmit a feedback signal for the data burst.

28. The receiver of claim 22 , wherein, according to at least one of a Frequency Division Duplex (FDD), a Time Division Duplex (TDD), and a Half-duplex duplex FDD (HFDD) scheme to be used in the wireless mobile communication system, the threshold is determined by:

DL

UL

L max

TTI threshold

L max

TTI threshold

FDD

F

Ceil(F/2) − T RX

F

Floor(F/2) − T RX

TDD M:N

M − m

M − m + n m − T RX

N − n

N − n + m n − T RX

HFDD

DU

M − m

M − m + (n m − M) − T RX =

N − n

N − (n − M) + m n − T RX

M:N

−m + n m − T RX

UD

N − m

N − (m − M) + n m − T RX

M − n

M − n + (m n − N) −

T RX

where F denotes the number of subframes constituting one frame, M denotes the number of subframes constituting a DL frame and N denotes the number of subframes constituting a UL frame in a TDD communication system and an HFDD DU communication system, DU denotes a frame structure in which a UL frame is arranged after a DL frame in time in an HFDD communication system, M denotes the number of subframes constituting a UL frame and N denotes the number of subframes constituting a DL frame in an HFDD UD communication system, UD denotes a frame structure in which a DL frame is arranged after a UL frame in time in the HFDD communication system, m denotes a DL subframe index in which data burst transmission starts, m n denotes a subframe index m in which at least one of ACK and NACK for data burst transmission started in a No. n subframe is transmitted, n m denotes a subframe index n in which at least one of ACK and NACK for data burst transmission started in a No. m subframe is transmitted, and T RX denotes the number of subframes required for a reception processing time.