If the uplink control information is not scheduled or allocated at the center frequency of the N number of RBs, it is able to have characteristics described in the following. In particular, it is able to transmit an RACH sequence from the timing of transmitting a downlink control signal to the timing of transmitting an uplink control signal. And, it is able to guarantee RTT as much as remaining duration resulted from subtracting maximum delay spread duration from CP duration. Although a downlink control signal and an uplink control signal are not transmitted on the center frequency of an RACH subframe in which an RACH sequence is transmitted, a downlink control signal and an uplink control signal are transmitted in a different RB. The base station receives an RACH sequence and an uplink control signal (or information) using a frequency division multiplexing (FDM) scheme. And, an RACH sequence is transmitted in uplink at the center frequency of a downlink control zone within an RACH subframe and downlink control information is transmitted in a region other than the center frequency of the downlink control zone. In particular, downlink and uplink coexist in the aspect of the same time. However, since an RACH is received by a base station only and a margin is put by a CP, downlink and uplink exist via FDM. Hence, it is able to perform simultaneous transmission.

Example of designing Downlink/Uplink Control-Puncturing Based Extended RACH Subframe

FIG. 15 is a diagram illustrating a concept of a downlink/uplink control-puncturing based extended RACH subframe in the aspect of reception of a base station.