Method for transmitting reference signal in NB-IoT system, and device therefor

A method for transmitting a reference signal by a base station in a cellular mobile communication system supporting narrowband-Internet of Things (NB-IoT), the method comprising:

• transmitting a narrowband reference signal (NRS) for signal demodulation or measurement in the NB-IoT through one or more first subframes among first candidate subframes predetermined for the NRS;
• transmitting configuration information to the UE for one or more second subframes;
• transmitting a narrowband positioning reference signal (NPRS) for positioning in the NB-IoT through the one or more second subframes;
• and
• transmitting power ratio information for the NRS, wherein the power ratio information is defined as a ratio between a power of a first resource element (RE) transmitting the NRS and a power of a second RE not transmitting the NRS and transmitting the NPRS, wherein the first RE is included in the one or more first subframes and the second RE is included in the one or more second subframes;
• wherein the NRS is not transmitted at a subframe of the first candidate subframes which is included in the one or more second subframes configured by the configuration information, and
• wherein a power of the NPRS is implicitly informed to the UE based on the power ratio information for the NRS.

A user equipment (UE) for receiving a reference signal in a cellular mobile communication system supporting narrowband-Internet of Things (NB-IoT), the UE comprising:

• a transceiver configured to:
• receive a narrowband reference signal (NRS) for signal demodulation or measurement in the NB-IoT through one or more first subframes among first candidate subframes predetermined for the NRS;
• receive configuration information from the base station for one or more second subframes;
• receive a narrowband positioning reference signal (NPRS) for positioning in the NB-IoT through the one or more second subframes;
• and receive power ratio information for the NRS, wherein the power ratio information is defined as a ratio between a power of a first resource element (RE) transmitting the NRS and a power of a second RE not transmitting the NRS and transmitting the NPRS, wherein the first RE is included in the one or more first subframes and the second RE is included in the one or more second subframes;
• and
• a processor configured to process the NRS and the NPRS based on that the NRS is not received at a subframe of the first candidate subframes which is included in the one or more second subframes configured by the configuration information and a power of the NPRS is implicitly informed to the UE based on the power ratio information for the NRS.

A base station for transmitting a reference signal in a cellular mobile communication system supporting narrowband-Internet of Things (NB-IoT), the base station comprising:

• a transceiver configured to:
• transmit a narrowband reference signal (NRS) for signal demodulation or measurement in the NB-IoT through one or more first subframes among first candidate subframes predetermined for the NRS transmit configuration information to the UE for one or more second subframes;
• transmit a narrowband positioning reference signal (NPRS) for positioning in the NB-IoT through the one or more second subframes;
• and transmit power ratio information for the NRS, wherein the power ratio information is defined as a ratio between a power of a first resource element (RE) transmitting the NRS and a power of a second RE not transmitting the NRS and transmitting the NPRS, wherein the first RE is included in the one or more first subframes and the second RE is included in the one or more second subframes;
• and
• a processor configured to control the transceiver such that the NRS is not transmitted at a subframe of the first candidate subframes which is included in the one or more second subframes configured by the configuration information,
• wherein a power of the NPRS is implicitly informed to the UE based on the power ratio information for the NRS.