The present specification provides a method for transmitting a Narrowband Physical Random Access Channel (NPRACH) preamble in a NB (Narrow Band) -IoT (Internet of Things) system supporting frame structure type 2. In particular, the method performed by the terminal comprises the steps of: receiving from the base station control information associated with an uplink-downlink configuration; And transmitting the NPRACH preamble to the base station based on parameters related to the NPRACH preamble transmission associated with the received control information.
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