Method and apparatus for cancelling other cell interference in a wireless communication system

1. A transmission method for reducing other cell interference in a wireless communication system, comprising:

generating, at a Base Station (BS), at least one modulation symbol to be transmitted;

repeating, mapping, and assigning the modulation symbol, at the BS, into a resource block common to the BS and at least one neighboring BS, the at least one neighboring BS being substantially adjacent to the BS, and the resource block comprising a plurality of subcarriers or a plurality of time intervals, wherein the modulation symbol is repeated according to repetition number R such that the modulation symbol can be assigned to each of the plurality of subcarriers or each of the plurality of time intervals; and

spreading the mapped modulation symbol, at the BS, with a BS-specific code allocated to the BS, the BS-specific codes of the BS being one of orthogonal and quasi-orthogonal to a BS-specific code allocated to the neighbor BS.

2. The transmission method of claim 1 , further comprising;

processing the spread data by Inverse Fast Fourier Transform (IFFT) and transmitting the IFFT signal to a user terminal by the BS.

3. The transmission method of claim 1 , wherein the modulation symbol is repeated before the mapping into the resource block.

4. The transmission method of claim 1 , wherein the repetition number R comprises a number of the plurality of subcarriers or a number of the plurality of time intervals.

5. The transmission method of claim 4 , wherein the repetition number R is a predetermined repetition number and the number R is variable.

6. The transmission method of claim 5 , wherein the repetition number R is an exponent of 2.

7. The transmission method of claim 1 , wherein the plurality of subcarriers comprises a plurality of subcarriers in a time interval and the plurality of time intervals comprises a plurality of time intervals on a subcarrier in an OFDMA frame.

8. The transmission method of claim 1 , wherein the resource block is commonly allocated to the same logical channel of the BS and the neighboring BS.

9. A transmitter of a Base Station (BS) for reducing other cell interference in a wireless communication system, comprising:

a symbol generator for generating at least one modulation symbol to be transmitted;

a resource mapper for repeating, mapping and assigning the modulation symbol into a resource block common to the BS and at least one neighboring BS, wherein the modulation symbol is repeated according to repetition number R and the repeated modulation symbol is assigned to least one of R time intervals or R subcarriers in a frame; and

a spreader for spreading the mapped modulation symbol with a BS-specific code allocated to the BS, the BS-specific codes of the BS being one of orthogonal and quasi-orthogonal to a BS-specific code allocated to the neighbor BS.

10. The transmitter of claim 9 , further comprising;

a IFFT processor for processing the spread data by Inverse Fast Fourier Transform (IFFT) and transmitting the IFFT signal to a user terminal by the BS.

11. The transmitter of claim 9 , wherein the resource mapper performs the repeating prior to the mapping.

12. The transmitter of claim 11 , wherein the frame comprises an OFDMA frame.

13. The transmitter of claim 12 , wherein the repetition number R is a predetermined repetition number and the number R is variable.

14. The transmitter of claim 13 , wherein the repetition number R is an exponent of 2.

15. The transmitter of claim 9 , wherein the time-frequency resource block is defined by at least one of a plurality of subcarriers in a time interval and a plurality of time intervals on a subcarrier in an OFDMA frame.

16. The transmission method of claim 9 , wherein the resource block is commonly allocated to the same logical channel of the BS and the neighboring BS.

17. A receiving method for reducing other cell interference in a wireless communication system, comprising:

receiving, at a Mobile Terminal (MT), a spread data through a resource block common to a Base Station (BS) and at least one neighboring BS, the resource block comprising a plurality of subcarriers or a plurality of time intervals, wherein a modulation symbol is repeated in the resource block according to repetition number R such that each of the plurality of subcarriers or each of the plurality of time intervals comprises the modulation symbol;

despreading the spread data, at the MT, with a BS-specific code allocated to the BS and outputting at least one modulation symbol, the BS-specific codes of the BS being one of orthogonal and quasi-orthogonal to a BS-specific code allocated to the neighbor BS; and

decoding the modulation symbol at the MT.

18. The receiving method of claim 17 , wherein the plurality of subcarriers comprises a plurality of subcarriers in a time interval and the plurality of time intervals comprises a plurality of time intervals on a subcarrier in an OFDMA frame.

19. The receiving method of claim 17 , wherein the resource block is commonly allocated to the same logical channel of the BS and the neighboring BS.

20. The receiving method of claim 17 , wherein the resource block is a time-frequency resource block.

21. A transmission system for reducing other cell interference in a wireless communication system, comprising:

means for generating, at a Base Station (BS), at least one modulation symbol to be transmitted;

means for repeating, mapping, and assigning the modulation symbol, at the BS, into a resource block common to the BS and at least one neighboring BS, the resource block comprising a plurality of subcarriers in a time interval or a plurality of time intervals on a subcarrier, wherein the modulation symbol is repeated according to repetition number R such that the modulation symbol can be assigned to each of the plurality of subcarriers or each of the plurality of time intervals; and

means for spreading the mapped modulation symbol, at the BS, with a BS-specific code allocated to the BS, the BS-specific codes of the BS being one of orthogonal and quasi-orthogonal to a BS-specific code allocated to the neighbor BS.

22. A processor that executes instructions for a wireless communication system, the instructions comprising:

generating, at a Base Station (BS), at least one modulation symbol to be transmitted;

repeating, mapping, and assigning the modulation symbol, at the BS, into a resource block common to the BS and at least one neighboring BS, the resource block comprising at least one of a plurality of subcarriers or a plurality of time intervals, wherein the modulation symbol is repeated according to repetition number R such that the modulation symbol can be assigned to at least one of each of the plurality of subcarriers or each of the plurality of time intervals; and

spreading the mapped modulation symbol, at the BS, with a BS-specific code allocated to the BS, the BS-specific codes of the BS being one of orthogonal and quasi-orthogonal to a BS-specific code allocated to the neighbor BS.