FIELD: radio engineering, communication.
SUBSTANCE: method comprises steps of: setting α as a logical index of each Zadoff-Chu sequence, and u as a physical index of said each Zadoff-Chu sequence, wherein 1≤u≤N-1, 0≤α≤N-2, and N is the length of said each Zadoff-Chu sequence; establishing a mapping relationship between the logical index and the physical index: 
is taken as a symmetry axis, α is mapped to u via a longitudinal symmetry method, and on the upper side of the symmetry axis, u monotonously decreases or increases, while on the lower side of the symmetry axis, u monotonously increases or decreases, respectively.
EFFECT: providing the same coverage of physical random access channels of user devices using different sequences in the same cell, thus flexibility of transmission scheduling in a cell can be improved.
10 cl, 4 dwg
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