other sequence sets for changing the zcz length according to the present invention the embodiment of fig1 indicates that both the cp length and the cs length are changed to others according to the cell size the most flexible design method is to select an optimum sequence set by selecting the proper cp length and the proper zcz size according to the cell size the embodiment of fig1 optimally adjusts the number of sequences and maintains the perfect periodic correlation characteristics between sequences referring to fig1 the user equipment ue can select an appropriate sequence set according to the size of a corresponding cell from among sequence sets associated with the cp length if the sequence set having a specific cp length is selected the embodiment of fig1 can select a sequence set which has an appropriate zcz length according to the size of a cell including the ue from among lower sequence sets classified according to the zcz length contained in the sequence set having the selected cp length needless to say in the case of selecting the sequence set having the proper cp length and the proper zcz length the above mentioned method for selecting the zcz length after selecting the cp length has been disclosed for only illustrative purposes and the order of selecting the cp length and the zcz length may be reversed as necessary in order to select the sequence set as described above the node b must indicate which one of the cp lengths will be used along with an original sequence index to be used and at the same time must indicate which one of the zcz lengths will be used along with the same original sequence index and this indication information may be transferred over.