Method and device for wireless signal transmission or reception in wireless communication system

A user equipment (UE) in a time-domain duplexing (TDD)-based wireless communication system, the UE comprising:

• a radio frequency (RF) module;
• and
• a processor,
• wherein the processor is configured to detect a narrowband physical downlink control channel (NPDCCH), and, based on the detection of the NPDCCH, receive a narrowband physical downlink shared channel (NPDSCH) in a downlink subframe on a carrier, wherein the downlink subframe immediately follows an uplink subframe,
• wherein, based on the carrier being in an in-band mode, the NPDSCH is received starting from kth (k>1) orthogonal frequency division multiplexing (OFDM) symbol, without skipping any part of the NPDSCH, and
• wherein, based on the carrier being in a guard-band or stand-alone mode, the NPDSCH is received, with skipping a starting part of the NPDSCH.