Method for receiving nrs and nb-iot device thereof

A narrowband internet of things (NB-IoT) device configured to receive a narrowband reference signal (NRS), the NB-IoT device comprising:

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
• determining information regarding a time division duplex (TDD) special subframe configuration, among a plurality of TDD special subframe configurations that each configures a plurality of downlink (DL) orthogonal frequency division multiplexing (OFDM) symbols and at least one uplink (UL) OFDM symbol within a TDD special subframe;
• and
• receiving, via the transceiver, the NRS on at least one DL OFDM symbol among the plurality of DL OFDM symbols within the TDD special subframe,
• wherein a symbol location of the at least one OFDM symbol for receiving the NRS is determined based on the TDD special subframe configuration.