Method for transmitting uplink data in wireless communication system supporting narrowband internet of things, and apparatus therefor

A user equipment (UE) for transmitting uplink data in a wireless communication system supporting a NarrowBand-Internet of things (NB-IoT) system, the UE comprising:

• a transceiver transceiving a radio signal;
• a memory;
• and
• a processor connected to the transceiver and the memory,
• wherein the processor is configured to:
• receive, from a base station, configuration information related to a Preconfigured Uplink Resource (PUR) for transmitting uplink data;
• and
• transmit, to the base station, the uplink data using the PUR, wherein the uplink data is transmitted in an RRC idle state, and
• wherein the PUR is a dedicated resource and the transmission of the uplink data is performed or skipped,
• wherein the transmission of the uplink data is performed based on a timing alignment validation which is related to a timing alignment value for the transmission of the uplink data using the PUR,
• wherein the timing alignment validation is performed based on a time alignment timer and at least one threshold related to a Narrowband Reference Signal Received Power (NRSRP) which are configured by the base station,
• wherein, based on i) the time alignment timer running and ii) a NRSRP fulfilling a condition based on the at least one threshold related to the NRSRP, the timing alignment value for the transmission of the uplink data using the PUR is determined to be valid,
• wherein a number of times of a consecutive skipping of the transmission of the uplink data is counted and compared with a number of times configured by the base station, and
• wherein, based on the number of times of the consecutive skipping of the transmission of the uplink data being equal to the number of times configured by the base station, the PUR is released.

A base station for receiving uplink data in a wireless communication system supporting a NarrowBand-Internet of things (NB-IoT) system, the base station comprising:

• a transceiver transceiving a radio signal;
• a memory;
• and
• a processor connected to the transceiver and the memory,
• wherein the processor is configured to:
• transmit, to a user equipment (UE), configuration information related to a Preconfigured Uplink Resource (PUR) for transmitting uplink data;
• and
• receive, from the UE, the uplink data using the PUR, wherein the uplink data is transmitted in an RRC idle state, and
• wherein the PUR is a dedicated resource and the transmission of the uplink data is performed or skipped,
• wherein the transmission of the uplink data is performed based on a timing alignment validation which is related to a timing alignment value for the transmission of the uplink data using the PUR,
• wherein the timing alignment validation is performed based on a time alignment timer and at least one threshold related to a Narrowband Reference Signal Received Power (NRSRP) which are configured by the base station,
• wherein, based on i) the time alignment timer running and ii) a NRSRP fulfilling a condition based on the at least one threshold related to the NRSRP, the timing alignment value for the transmission of the uplink data using the PUR is determined to be valid,
• wherein a number of times of a consecutive skipping of the transmission of the uplink data is counted and compared with a number of times configured by the base station, and
• wherein, based on the number of times of the consecutive skipping of the transmission of the uplink data being equal to the number of times configured by the base station, the PUR is released.