Method for transmitting and receiving uplink signal for NB-IoT UE and apparatus therefor

1. A method for transmitting an uplink signal by a Narrow Band Internet of things (NB-IoT) user equipment (UE), the method comprising:

receiving, from a base station, uplink resource allocation information for transmitting HARQ ACK/NACK for downlink data;

configuring a time-axis wireless resource and a frequency-axis wireless resource of an uplink signal including the HARQ ACK/NACK, based on the uplink resource allocation information; and

transmitting the uplink signal through the time-axis wireless resource and frequency-axis wireless resource,

wherein the uplink resource allocation information includes subcarrier allocation information and sub-frame allocation information which are allocated for the transmission of the HARQ ACK/NACK for the downlink data;

wherein the sub-frame allocation information includes sub-frame offset information for configuring the time-axis wireless resource of the uplink signal;

wherein the sub-frame offset information includes a sub-frame offset value to be used to determine a location of an uplink sub-frame for the HARQ ACK/NACK by applying to the last sub-frame of repetitively receiving the downlink data, where the sub-frame offset value is differently allocated according to a subcarrier spacing of the NB-IoT UE,

wherein the uplink resource allocation information is included in downlink control information which allocates the subcarrier allocation information and the sub-frame allocation information in pairs, and

wherein the transmitting the uplink signal comprises transmitting the uplink signal including the HARQ ACK/NACK in uplink signal transmission subframe of the time-axis wireless resource which is determined as equation as follows,

Uplink signal transmission sub-frame for HARQ ACK/NACK=last sub-frame n for NPDSCH repetitive transmission+sub-frame allocation information ( K n )− A,   [Equation]

where the last sub-frame n for NPDSCH repetitive transmission is the last sub-frame of repetitively receiving the downlink data, the sub-frame allocation information (K n ) is the sub-frame offset value, and the A is a predetermined natural number which is configured as 1.

2. The method of claim 1 , wherein the downlink control information is received through the downlink control channel.

3. The method of claim 1 , wherein the time-axis wireless resource of the uplink signal is configured by applying the sub-frame offset value to the last sub-frame of receiving the downlink data.

4. The method of claim 1 , wherein the sub-frame offset value is allocated as 13 or 21.

5. A method for receiving an uplink signal by a base station, the method comprising:

configuring uplink resource allocation information for receiving HARQ ACK/NACK for downlink data from a Narrow Band Internet of things (NB-IoT) user equipment (UE);

transmitting the uplink resource allocation information and the downlink data to the NB-IoT UE; and

receiving an uplink signal including the HARQ ACK/NACK through a time-axis wireless resource and a frequency-axis wireless resource, which are configured based on the uplink resource allocation information,

wherein the uplink resource allocation information includes subcarrier allocation information and sub-frame allocation information which are allocated for the transmission of the HARQ ACK/NACK for the downlink data;

wherein the sub-frame allocation information includes sub-frame offset information for configuring the time-axis wireless resource of the uplink signal;

wherein the sub-frame offset information includes a sub-frame offset value to be used to determine a location of an uplink sub-frame for the HARQ ACK/NACK by applying to the last sub-frame of repetitively receiving the downlink data, where the sub-frame offset value is differently allocated according to a subcarrier spacing of the NB-IoT UE,

wherein the uplink resource allocation information is included in downlink control information which allocates the subcarrier allocation information and the sub-frame allocation information in pairs, and

wherein the receiving the uplink signal comprises receiving the uplink signal including the HARQ ACK/NACK in uplink signal transmission subframe of the time-axis wireless resource which is determined as equation as follows,

Uplink signal transmission sub-frame for HARQ ACK/NACK=last sub-frame n for NPDSCH repetitive transmission+Sub-frame allocation information ( K n )− A,   [Equation]

Where the last sub-frame n for NPDSCH repetitive transmission is the last sub-frame of repetitively receiving the downlink data, the Sub-frame allocation information (K n ) is the sub-frame offset value, and the A is predetermined natural number which is configured as 1.

6. The method of claim 5 , wherein the downlink control information is transmitted through the downlink control channel.

7. The method of claim 5 , wherein the time-axis wireless resource of the uplink signal is configured by applying the sub-frame offset value to the last sub-frame of receiving the downlink data by the NB-IoT UE.

8. The method of claim 5 , wherein the sub-frame offset value is allocated as 13 or 21.

9. A Narrow Band Internet of things (NB-IoT) user equipment (UE) for transmitting an uplink signal, the NB-IoT UE comprising:

a receiver configured to receive, from a base station, uplink resource allocation information for transmitting HARQ ACK/NACK for downlink data;

a controller configured to configure a time-axis wireless resource and a frequency-axis wireless resource of an uplink signal including the HARQ ACK/NACK, based on the uplink resource allocation information; and

a transmitter configured to transmit the uplink signal through the time-axis wireless resource and frequency-axis wireless resource,

wherein the uplink resource allocation information includes subcarrier allocation information and sub-frame allocation information which are allocated for the transmission of the HARQ ACK/NACK for the downlink data;

wherein the sub-frame allocation information includes sub-frame offset information for configuring the time-axis wireless resource of the uplink signal;

wherein the sub-frame offset information includes a sub-frame offset value to be used to determine a location of an uplink sub-frame for the HARQ ACK/NACK by applying to the last sub-frame of repetitively receiving the downlink data, where the sub-frame offset value is differently allocated according to a subcarrier spacing of the NB-IoT UE,

wherein the uplink resource allocation information is included in downlink control information which allocates the subcarrier allocation information and the sub-frame allocation information in pairs, and

wherein the transmitter transmits the uplink signal including the HARQ ACK/NACK in uplink signal transmission subframe of the time-axis wireless resource which is determined as equation as follows,

Uplink signal transmission sub-frame for HARQ ACK/NACK=last sub-frame n for NPDSCH repetitive transmission+Sub-frame allocation information ( K n )− A,   [Equation]

Where the last sub-frame n for NPDSCH repetitive transmission is the last sub-frame of repetitively receiving the downlink data, the Sub-frame allocation information (K n ) is the sub-frame offset value, and the A is a predetermined natural number which is configured as 1.

10. The NB-IoT UE of claim 9 , wherein the downlink control information is received through the downlink control channel.

11. The NB-IoT UE of claim 9 , wherein the time-axis wireless resource of the uplink signal is configured by applying the sub-frame offset value to the last sub-frame of receiving the downlink data.

12. The NB-IoT UE of claim 9 , wherein the sub-frame offset value is allocated as 13 or 21.