Method for generating a reference signal sequence using grouping

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.