Apparatus and method for transmitting/receiving the hybrid-ARQ ACK/NACK signal in mobile communication system

1. A method for transmitting control information in a mobile communication system, the method comprising:

spreading the control information with an orthogonal sequence according to a spreading factor;

mapping the spread control information to a multiple antenna array based on a repetition index and a Physical Hybrid Automatic Repeat reQuest (HARQ) Indicator CHannel (PHICH) group index; and

transmitting the mapped spread control information,

wherein the spread control information is mapped to the multiple antenna array in an alternating pattern in accordance with the repetition index.

2. The method of claim 1 , wherein at least one of complex conjugation and sign reversal is applied to map the spread control information to the multiple antenna array.

3. The method of claim 1 , wherein the repetition index is three (3).

4. The method of claim 3 , wherein the multiple antenna array includes four (4) antennas and the spreading factor is four (4).

5. The method of claim 1 , further comprising:

mapping the spread control information to four (4) consecutive resource elements for ACKnowledge/Negative ACKnowledge (ACK/NACK) transmission, in a time-frequency domain.

6. The method of claim 1 , wherein if a start symbol of an Orthogonal Frequency Division Multiplexing (OFDM) symbol is defined as n=0, symbol index n for the transmission of the control information is mapped in an order [010], and

wherein if the start symbol of the OFDM symbol is defined as n=1, the symbol index n for the transmission of the control information is mapped in the order [101].

7. The method of claim 1 , wherein the alternating pattern is applied between at least two PHICH groups among a plurality of PHICH groups.

8. The method of claim 1 , wherein the spread control information is mapped to the multiple antenna array according to:

Antenna Mapping

PHICH Group g

Repetition Index r

Pattern

0

0

A

0

1

B

0

2

A

1

0

B

1

1

A

1

2

B

2

0

A

2

1

B

2

2

A

3

0

B

3

1

A

3

2

B

. . .

. . .

. . . .

9. An apparatus for transmitting control information in a mobile communication system, the apparatus comprising:

a processor that spreads the control information with an orthogonal sequence according to a spreading factor and maps the spread control information to a multiple antenna array based on a repetition index and a Physical Hybrid Automatic Repeat reQuest (HARQ) Indicator CHannel (PHICH) group index; and

a transmitter for transmitting the mapped spread control information,

wherein the spread control information is mapped to the multiple antenna array in an alternating pattern in accordance with the repetition index.

10. The apparatus of claim 9 , wherein at least one of complex conjugation and sign reversal is applied to map the spread control information to the multiple antenna array.

11. The apparatus of claim 9 , wherein the repetition index is three (3).

12. The apparatus of claim 11 , wherein the multiple antenna array includes four (4) antennas and the spreading factor is four (4).

13. The apparatus of claim 9 , wherein the processor maps the spread control information to four (4) consecutive resource elements for ACKnowledge/Negative ACKnowledge (ACK/NACK) transmission, in a time-frequency domain.

14. The apparatus of claim 9 , wherein if a start symbol of an Orthogonal Frequency Division Multiplexing (OFDM) symbol is defined as n=0, symbol index n for the transmission of the control information is mapped in an order [010], and

wherein if the start symbol of the OFDM symbol is defined as n=1, the symbol index n for the transmission of the control information is mapped in the order [101].

15. The apparatus of claim 9 , wherein the alternating pattern is applied between at least two PHICH groups among a plurality of PHICH groups.

16. The apparatus of claim 9 , wherein the spread control information is mapped to the multiple antenna array according to:

Antenna Mapping

PHICH Group g

Repetition Index r

Pattern

0

0

A

0

1

B

0

2

A

1

0

B

1

1

A

1

2

B

2

0

A

2

1

B

2

2

A

3

0

B

3

1

A

3

2

B

. . .

. . .

. . . .

17. A method for receiving control information in a mobile communication system, the method comprising:

receiving a signal;

determining location information of control information from the signal;

acquiring spread control information based on the location information from the signal, the spread control information being mapped to a multiple antenna array based on a repetition index and a Physical Hybrid Automatic Repeat reQuest (HARQ) Indicator CHannel (PHICH) group index; and

despreading the spread control information according to a spreading factor,

wherein the spread control information is mapped to the multiple antenna array in an alternating pattern in accordance with the repetition index.

18. The method of claim 17 , wherein at least one of complex conjugation and sign reversal is applied to map the spread control information to the multiple antenna array.

19. The method of claim 17 , wherein the repetition index is three (3).

20. The method of claim 19 , wherein the multiple antenna array includes four (4) antennas and the spreading factor is four (4).

21. The method of claim 17 , wherein the spread control information is mapped to four (4) consecutive resource elements for ACKnowledge/Negative ACKnowledge (ACK/NACK) transmission, in a time-frequency domain.

22. The method of claim 17 , wherein if a start symbol of an Orthogonal Frequency Division Multiplexing (OFDM) symbol is defined as n=0, symbol index n for the transmission of the control information is mapped in an order [010], and

wherein if the start symbol of the OFDM symbol is defined as n=1, the symbol index n for the transmission of the control information is mapped in the order [101].

23. The method of claim 17 , wherein the spread control information is mapped to the multiple antenna array according to:

Antenna Mapping

PHICH Group g

Repetition Index r

Pattern

0

0

A

0

1

B

0

2

A

1

0

B

1

1

A

1

2

B

2

0

A

2

1

B

2

2

A

3

0

B

3

1

A

3

2

B

. . .

. . .

. . . .

24. An apparatus for receiving control information in a mobile communication system, the apparatus comprising:

a receiver for receiving a signal;

a controller for determining location information of control information from the signal and for acquiring spread control information based on the location information from the signal, the spread control information being mapped to a multiple antenna array based on a repetition index and a Physical Hybrid Automatic Repeat reQuest (HARQ) Indicator CHannel (PHICH) group index; and

a despreader for despreading the spread control information according to a 1 spreading factor,

wherein the spread control information is mapped to the multiple antenna array in an alternating pattern in accordance with the repetition index.

25. The apparatus of claim 24 , wherein at least one of complex conjugation and sign reversal is applied to map the spread control information to the multiple antenna array.

26. The apparatus of claim 24 , wherein the repetition index is three (3).

27. The apparatus of claim 26 , wherein the multiple antenna array includes four (4) antennas and the spreading factor is four (4).

28. The apparatus of claim 24 , wherein the spread control information is mapped to four (4) consecutive resource elements for ACKnowledge/Negative ACKnowledge (ACK/NACK) transmission, in a time-frequency domain.

29. The apparatus of claim 24 , wherein if a start symbol of an Orthogonal Frequency Division Multiplexing (OFDM) symbol is defined as n=0, symbol index n for the transmission of the control information is mapped in an order [010], and

wherein if the start symbol of the OFDM symbol is defined as n=1, the symbol index n for the transmission of the control information is mapped in the order [101].

30. The apparatus of claim 24 , wherein the spread control information is mapped to the multiple antenna array according to:

Antenna Mapping

PHICH Group g

Repetition Index r

Pattern

0

0

A

0

1

B

0

2

A

1

0

B

1

1

A

1

2

B

2

0

A

2

1

B

2

2

A

3

0

B

3

1

A

3

2

B

. . .

. . .

. . . .