Patent ID: 8862172

Claim:
A method of establishing a communication link between a user equipment (UE) and a network, the method comprising: receiving, by the UE, a high-speed related parameter from the network, the high-speed related parameter representing either TRUE or FALSE, wherein TRUE corresponds to a restricted set of cyclic shifts and FALSE corresponds to an unrestricted set of cyclic shifts; if the high-speed related parameter represents TRUE, generating, by the UE, a first random access preamble sequence using the restricted set of cyclic shifts; and transmitting, by the UE, the generated first random access preamble sequence to the network, and if the high-speed related parameter represents FALSE, generating, by the UE, a second random access preamble sequence using the unrestricted set of cyclic shifts; and transmitting, by the UE, the generated second preamble sequence to the network, wherein the first random access preamble sequence and the second random preamble sequence are generated from Zadoff-Chu (ZC) sequences with zero correlation zones.