Patent ID: 8879478

Claim:
A method of transmitting a random access preamble via a user equipment (UE) in a radio communication system operable at least on a physical layer and a medium access control layer, the method comprising: the medium access control layer of the UE selecting one preamble group from at least two preamble groups according to at least radio conditions or a size of a message to be transmitted by the UE; the medium access control layer of the UE randomly selecting one random access preamble within the selected one preamble group; the medium access control layer of the UE signaling at least one parameter to the physical layer of the UE, the at least one parameter being used by the physical layer to select a random access preamble sequence and the at least one parameter comprising a random access preamble index; and the physical layer of the UE transmitting the selected random access preamble using the selected random access preamble sequence.