Patent ID: 8427971

Claim:
A method of performing a random access procedure in a wireless communication system, the method comprising: receiving random access information through a broadcast channel, the random access information comprising at least random access signature information, a power ramping parameter or an access slot configuration parameter; initiating a random access procedure according to a cause parameter, the cause parameter corresponding to a condition requiring a new random access before each preamble transmission; selecting a first signature for use in the preamble, the first signature based on the random access signature information; determining a first access slot for transmission of the first signature on a random access channel, the first access slot based on the access slot configuration parameter; determining transmission power for transmission of the first signature; transmitting the preamble comprising the first signature using the determined first access slot; selecting a second signature which is different from the first signature for re-transmission of the preamble based on a system frame number (SFN) when the transmission of the preamble comprising the first signature is not successful; and determining a second access slot for the re-transmission of the second signature by applying a cyclic shift to the first access slot based on the SFN when the transmission of the preamble comprising the first signature is not successful, the second access slot not overlapping with the first access slot.