FIG. 12(a) shows a case in which a RACH burst period and RACH burst timing of a first numerology Numerology1 are the same as a RACH burst period and RACH burst timing of a second numerology Numerology2. In the case of FIG. 12(a), a UE can select and use a RACH resource suitable for the situation thereof because the first numerology Numerology1 and the second numerology Numerology2 have the same the RACH burst timings and RACH burst periods according to PRACH resource configuration.
According to the embodiment illustrated in FIG. 12(a), PRACH resource information broadcast in each numerology can be solely transmitted to the UE because information about PRACH resource configuration is identical in all numerologies. Here, the UE can acquire PRACH configuration information of other numerologies using PRACH resource information transmitted from one numerology. For example, when the UE receives PRACH resource configuration information through a PBCH of the first numerology that uses a subcarrier spacing having a first size, the UE can determine that PRACH resource configuration information of the second numerology is the same as the PRACH resource configuration information of the first numerology even though the UE does not receive the PRACH resource configuration information of the second numerology that uses a subcarrier spacing having a second size.
