Method for generating a reference signal sequence using grouping

1. A method for a base station to receive a reference signal sequence from one or more devices within a cell of the base station in a multiple cell environment, the method comprising:

providing the one or more devices with information about the reference signal sequence, wherein the reference signal sequence is defined by a cyclic shift of a base sequence, wherein the base sequence is one of a plurality of base sequences divided into groups, wherein each of the groups comprises at least one base sequence for each length (N), and wherein each length (N) corresponds to (12*n), (n) being a positive integer; and

receiving the reference signal sequence from one or more of the one or more devices.

2. The method of claim 1 , wherein each of the groups comprises one base sequence of each length (N) when (n) is equal to or greater than 1 and equal to or less than 5, and two base sequences of each length (N) when (n) is equal to or greater than 6.

3. The method of claim 1 , wherein a number of the groups is 30.

4. The method of claim 1 , wherein the base sequence having a length (N) for cases where (n) is equal to or greater than 3 is given by using a Zadoff Chu (ZC) sequence.

5. The method of claim 1 , wherein the base sequence is given by using a Zadoff-Chu (ZC) sequence having a length (N ZC RS ), the length (N ZC RS ) being given by a prime number length such that the length (N ZC RS ) is less than the length (N), and

wherein a front part of the base sequence having the length (N ZC RS ) is from the ZC sequence having the length (N ZC RS ), and a rear part of the base sequence having a length of (N−N ZC RS ) is from a front part of the ZC sequence having the length of (N−N ZC RS ).

6. A base station for receiving a reference signal sequence from one or more devices within a cell of the base station in a multiple cell environment, the base station comprising:

a processor configured to generate information about the reference signal sequence, wherein the reference signal sequence is defined by a cyclic shift of a base sequence, wherein the base sequence is one of a plurality of base sequences divided into groups, wherein each of the groups comprises at least one base sequence for each length (N), and wherein each length (N) corresponds to (12*n), (n) being a positive integer; and

a transceiver configured to provide the one or more devices with the information, and to receive the reference signal sequence from one or more of the one or more devices.

7. The base station of claim 6 , wherein each of the groups comprises one base sequence of each length (N) when (n) is equal to or greater than 1 and equal to or less than 5, and two base sequences of each length (N) when (n) is equal to or greater than 6.

8. The base station of claim 6 , wherein a number of the groups is 30.

9. The base station of claim 6 , wherein the base sequence having a length (N) for cases where (n) is equal to or greater than 3 is given by using a Zadoff Chu (ZC) sequence.

10. The base station of claim 6 , wherein the base sequence is given by using a Zadoff-Chu (ZC) sequence having a length (N ZC RS ), the length (N ZC RS ) being given by a prime number length such that the length (N ZC RS ) is less than the length (N), and

wherein a front part of the base sequence having the length (N ZC RS ) is from the ZC sequence having the length (N ZC RS ), and a rear part of the base sequence having a length of (N−N ZC RS ) is from a front part of the ZC sequence having the length of (N−N ZC RS ).