Patent ID: 8406201
Filing Date: 2013-03-26
Classification: H04J,H04L,H04W

Abstract:
1. A method of requesting a random access connection with a base station, at a user equipment (UE) in a wireless system, the method comprising: receiving information comprising a cyclic shift parameter and at least one signature root sequence index; selecting one of a plurality of signature sequences, wherein each of the plurality of signature sequences is generated based on the cyclic shift parameter and the at least one signature root sequence index, and the selected one of the plurality of signature sequences is used for requesting contention-based random access to the base station; receiving a dedicated signature identifier, wherein the dedicated signature identifier represents a signature sequence generated based on the cyclic shift parameter and the at least one signature root sequence index, and the signature sequence is not used in the contention-based random access; transmitting a preamble for requesting contention-free random access to the base station, the transmitting comprising right-cyclic-shifting a dedicated signature according to the cyclic shift parameter; and transmitting a subsequent preamble for requesting contention-free random access by incrementally allocating the dedicated signature from a right-cyclic-shifted version of a different one of the at least one signature root sequence index if a preset number of cyclic shifts has been performed before a preset maximum number of dedicated signatures has been allocated, wherein: the preamble comprises the selected one of the plurality of signature sequences for the contention-based random access and the signature sequence represented by the dedicated signature identifier; and the preamble is generated after a preset maximum number of signature sequences for contention-based random access are selected.