Patent ID: 8913696

Claim:
A method of facilitating a user equipment (UE) communicating with a base station (BS) via a cell of a mobile communications system, the method comprising: selecting, by the UE, a random access preamble sequence from a set of random access preamble sequences; transmitting, by the UE, the random access preamble sequence to the BS; receiving, by the BS, the random access preamble sequence; and estimating, by the BS, a time of arrival of the random access preamble sequence, wherein the set of random access preamble sequences is included in 64 random access preamble sequences available in the cell, the 64 random access preamble sequences are obtained from at least one Zadoff-Chu sequence, the at least one Zadoff-Chu sequence is used in generation of a sequence x u,v (k) for the 64 random access preamble sequences, x u,v (k) is given by: x u,v (k)=x u,v ((k+vN CS ) mod N ZC ), where u and v are integers, N ZC is a length of the at least one Zadoff-Chu sequence, N CS is given by a pre-defined set including all of the following values: 0, 13, 15, 18, 22, 26, 32, 38, 46, 59, 76, 93, 119, 167, 279, 419, and Zadoff-Chu sequence is defined by: x u ( k )= W uk(k+1)/2 , k= 0,1, . . . , N ZC −1 , W=e −j2π/N ZC , j =√{square root over (−1)}.