METHOD FOR TRANSMITTING RACH USING VARIABLE RACH STRUCTURE, AND METHOD FOR REPEATING SEQUENCE FOR REDUCING THE INFLUENCE OF FREQUENCY OFFSET

摘要

An RACH(Random Access Channel) transmission method using various RACH structures and a sequence repetition method for reducing influence of frequency offsets are provided to suggest the various RACH structures having plural TTI(Transmission Time Interval) lengths, and to offer combination of the RACH structures usable according to whether preamble repetition structures are used or by the number of signaling bits. A signaling message is received from a base station to select more than one of predetermined RACH structures. An RACH signal having the RACH structure selected according to the signaling message is transmitted. The more than one of the predetermined RACH structures comprises as follows. The first type RACH structure has the first TTI length, and includes one preamble. The third type RACH structure has the second TTI length, and inculdes one preamble. The sixth type RACH structure has the third TTI length, and includes one preamble.