Patent ID: 8660066

Claim:
A method for transmitting a random access preamble, the method comprising: receiving, by a user equipment (UE), information that is associated with predetermined preambles for a random access; and transmitting, by the UE, a random access preamble selected from the predetermined preambles according to the information, wherein the selected random access preamble has a preamble format defined by a time-length value of a predetermined cyclic prefix (CP) and either a time-length value of a sequence or a time-length value of a repeated sequence, wherein the time-length value of the repeated sequence is two times the time-length value of the sequence, wherein the selected random access preamble is configured only with the predetermined CP and either the sequence or the repeated sequence without a time length of a guard time (GT), wherein the repeated sequence is configured by repeating the sequence, and wherein the time-length value of the predetermined CP is the same whether the sequence or the repeated sequence configures the selected random access preamble.