Patent ID: 8681895

Claim:
A method for transmitting a random access preamble to a base station, the method performed by a user equipment and comprising: generating the random access preamble from a Zadoff-Chu (ZC) sequence having a length N, wherein the random access preamble is generated based on a cyclic shift of the ZC sequence; and transmitting the random access preamble to the base station, wherein: the cyclic shift is given by using a variable M corresponding to a Doppler shift of one subcarrier spacing; parameters associated with defining the cyclic shift are differently defined based on whether the variable M is less than ⅓ of the length N; and the parameters comprise a number G of one or more groups defined from the ZC sequence, a length S of each of the one or more groups, and a number P of one or more applicable cyclic shift opportunities for each of the one or more groups.