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 and 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 signature for use in the preamble, the signature based on the random access signature information; and determining a first time frequency resource of a first access slot for transmission of the signature on a random access channel, wherein the first time frequency resource of the first access slot is based on the access slot configuration parameter; determining transmission power for transmission of the signature; and transmitting the preamble comprising the signature using the first time frequency resource of the first access slot, characterised by: determining a second time frequency resource of a second access slot for re-transmission of the signature by applying a cyclic shift to the first time frequency resource of the first access slot based on a system frame number, SFN, when the transmission of the preamble using the first time frequency resource of the first access slot is not successful, the second access slot not overlapping with the first access slot; and re-transmitting the preamble comprising the signature using the second time frequency resource of the second access slot when the transmission of the preamble using the first time frequency resource of the first access slot is not successful. receiving random access information through a broadcast channel, the random access information comprising at least random access signature information, a power ramping parameter and 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 signature for use in the preamble, the signature based on the random access signature information; and determining a first time frequency resource of a first access slot for transmission of the signature on a random access channel, wherein the first time frequency resource of the first access slot is based on the access slot configuration parameter; determining transmission power for transmission of the signature; and transmitting the preamble comprising the signature using the first time frequency resource of the first access slot, characterised by: determining a second time frequency resource of a second access slot for re-transmission of the signature by applying a cyclic shift to the first time frequency resource of the first access slot based on a system frame number, SFN, when the transmission of the preamble using the first time frequency resource of the first access slot is not successful, the second access slot not overlapping with the first access slot; and re-transmitting the preamble comprising the signature using the second time frequency resource of the second access slot when the transmission of the preamble using the first time frequency resource of the first access slot is not successful. determining a second time frequency resource of a second access slot for re-transmission of the signature by applying a cyclic shift to the first time frequency resource of the first access slot based on a system frame number, SFN, when the transmission of the preamble using the first time frequency resource of the first access slot is not successful, the second access slot not overlapping with the first access slot; and re-transmitting the preamble comprising the signature using the second time frequency resource of the second access slot when the transmission of the preamble using the first time frequency resource of the first access slot is not successful.