Patent ID: 8401113

Claim:
A method for transmitting a random access preamble to a base station at a user equipment (UE), the method comprising: generating the random access preamble from a Zadoff-Chu sequence having a length ‘N’ and a root index ‘M’, wherein the random access preamble is defined by a cyclic shift of the Zadoff-Chu sequence; and transmitting the generated random access preamble to the base station via a random access channel, wherein: the cyclic shift is given by using a variable corresponding to a Doppler shift of one subcarrier spacing, the variable given by using the root index ‘M’, the cyclic shift is differently given based on whether the variable is smaller than ⅓ of the length ‘N’, and the length N is a non-negative integer and the root index M is a non-negative integer.