Method and system for transmitting or receiving feedback in wireless communication system supporting NB-IoT

1. A user equipment (UE) receiving a feedback from a base station in a wireless communication system supporting narrowband (NB)-internet of things (IoT), the UE comprising:

a radio frequency (RF) module configured to transmit and receive a radio signal; and

a processor functionally connected to the RF module,

wherein the processor is configured to:

receive, from the base station, a preconfigured uplink (UL) resource (PUR) configuration via RRC signalling;

when the UE is in an idle mode, transmit, to the base station, uplink data on the PUR; and

receive, from the base station, a feedback for the uplink data,

wherein the feedback is configured to be received on an NPDCCH after a specific time has passed from the PUR transmission.

2. The UE of claim 1 , wherein the specific time is a specific number of at least one subframe.

3. The UE of claim 2 , wherein the specific number is four.

4. The UE of claim 1 , wherein the processor is further configured to:

monitor a feedback window on a search space for transmitting the feedback; and

stop the monitoring based on whether or not DCI including the feedback is received on the feedback window.

5. The UE of claim 1 , wherein the processor is further configured to:

receive, from the base station, a response on other second field excluding a first field required to indicate a PUR retransmission from a plurality of fields included in a UL grant.

6. A base station transmitting a feedback to a user equipment (UE) in a wireless communication system supporting narrowband (NB)-internet of things (IoT), the base station comprising:

a radio frequency (RF) module configured to transmit and receive a radio signal; and

a processor functionally connected to the RF module,

wherein the processor is configured to:

transmit, to the UE, a preconfigured uplink (UL) resource (PUR) configuration via RRC signalling;

when the UE is in an idle mode, receive, from the UE, uplink data on the PUR; and

transmit, to the UE, a feedback for the uplink data,

wherein the feedback is configured to be transmitted on an NPDCCH after a specific time has passed from the PUR reception.

7. The base station of claim 6 , wherein the specific time is a specific number of at least one subframe.

8. The base station of claim 7 , wherein the specific number is four.

9. The base station of claim 6 , wherein the processor is further configured to:

monitor a feedback window on a search space for transmitting the feedback; and

indicate, to the UE, stopping the monitoring based on whether or not DCI including the feedback is received on the feedback window.

10. The base station of claim 6 , wherein the processor is further configured to:

transmit, to the UE, a response on other second field excluding a first field required to indicate a PUR retransmission from a plurality of fields included in a UL grant.

11. A method for receiving, by a user equipment (UE), a feedback from a base station in a wireless communication system supporting narrowband (NB)-internet of things (IoT), the method comprising:

receiving, from the base station, a preconfigured uplink (UL) resource (PUR) configuration via RRC signalling;

when the UE is in an idle mode, transmitting, to the base station, uplink data on the PUR; and

receiving, from the base station, a feedback for the uplink data,

wherein the feedback is configured to be received on an NPDCCH after a specific time has passed from the PUR transmission.

12. The method of claim 11 , wherein the specific time is a specific number of at least one subframe.

13. The method of claim 12 , wherein the specific number is four.

14. The method of claim 11 , further comprising:

monitoring a feedback window on a search space for transmitting the feedback; and

stopping the monitoring based on whether or not DCI including the feedback is received on the feedback window.

15. The method of claim 11 , further comprising:

configuring to receive, from the base station, a response on other second field excluding a first field required to indicate a PUR retransmission from a plurality of fields included in a UL grant.

16. A method for transmitting, by a base station, a feedback to a user equipment (UE) in a wireless communication system supporting narrowband (NB)-internet of things (IoT), the method comprising:

transmitting, to the UE, a preconfigured uplink (UL) resource (PUR) configuration via RRC signalling;

when the UE is in an idle mode, receiving, from the UE, uplink data on the PUR; and

transmitting, to the UE, a feedback for the uplink data,

wherein the feedback is configured to be transmitted on an NPDCCH after a specific time has passed from the PUR reception.

17. The method of claim 16 , wherein the specific time is a specific number of at least one subframe.

18. The method of claim 17 , wherein the specific number is four.

19. The method of claim 16 , further comprising:

monitoring a feedback window on a search space for transmitting the feedback; and

indicating, to the UE, stopping the monitoring based on whether or not DCI including the feedback is received on the feedback window.

20. The method of claim 16 , further comprising:

configuring to transmit, to the UE, a response on other second field excluding a first field required to indicate a PUR retransmission from a plurality of fields included in a UL grant.