Patent ID: 8295229

Claim:
A method of selecting signatures for random access in a wireless communication system, the method comprising: receiving information comprising at least one root sequence index, a cyclic shift parameter, and a configuration parameter that corresponds to different power metric threshold values; providing at least one root sequence table for random access transmission according to the configuration parameter; and accessing the at least one root sequence table in order to generate a predetermined number of signatures, the at least one root sequence table accessed according to the at least one root sequence index and the cyclic shift parameter, wherein the at least one root sequence table comprises a plurality of root sequences arranged in a first root sequence group and a second root sequence group, the first root sequence group corresponding to signatures that are less than or equal to a predetermined cubic metric value and the second root sequence group corresponding to signatures that are greater than the predetermined cubic metric value, wherein each of the first root sequence group and the second root sequence group further comprises signature sub-groups that are arranged according to at least one alternate power metric ordering in adjacent signature sub-groups or alternate maximum cyclic shift.