Method and device for reporting measurement result by terminal in coverage expansion area

1. A method for reporting, by a user equipment (UE) in a coverage enhancement area, a measurement result in a wireless communication system, the method comprising:

receiving a measurement configuration including period information, a predefined first RSRP threshold for a first CE level and a predefined second RSRP threshold for a second CE level, from a network,

wherein the period information informs the UE that a cell is to be measured only in a coverage enhancement (CE) mode during a certain time duration included in the period information;

measuring the cell in the CE mode or a non-CE mode, based on the period information,

wherein the cell is measured for a longer time in the CE mode than in the non-CE mode,

wherein the cell is measured in the first CE level, when an RSRP of the cell measured by the UE exceeds the first RSRP threshold,

wherein the cell is measured in the second CE level, when the RSRP of the cell measured by the UE is the first RSRP threshold or lower, and when the RSRP of the cell measured by the UE exceeds the second RSRP threshold,

wherein the first RSRP threshold is greater than the second RSRP threshold, and

wherein the second CE level has a wider range of enhanced coverage than the first CE level;

reporting the measurement result of the measured cell to the network; and

reporting measurement state information including first information which informs the network whether the cell is measured in the CE mode or the non-CE mode, to the network.

2. The method of claim 1 , wherein the measurement state information includes second information which informs the network that the measurement result in the CE mode has lower accuracy than the measurement result in the non-CE mode.

3. The method of claim 1 , wherein the measurement state information includes a number of repetition times of downlink reception for successful reception of a particular message or a particular channel, or includes a number of repetition times of uplink transmission for successful transmission of a particular message or a particular channel.

4. The method of claim 1 , wherein the measurement state information includes third information which informs the network whether the cell is measured based on CSI-RS-based DRS measurement.

5. The method of claim 1 , wherein the measurement configuration includes a predefined RSRP threshold, and

wherein the cell is measured in the CE mode, when an RSRP of the cell measured by the UE is the predefined RSRP threshold or lower.

6. The method of claim 1 , wherein the measurement configuration includes a predefined RSRQ threshold, and

wherein the cell is measured in the CE mode, when an RSRQ of the cell measured by the UE is the predefined RSRQ threshold or lower.

7. The method of claim 1 , wherein the measurement configuration includes a threshold for downlink reception, and

wherein the cell is measured in the CE mode, when a number of times the UE performs repetitions for downlink reception exceeds the threshold for downlink reception.

8. The method of claim 1 , wherein the measurement configuration includes a threshold for uplink transmission, and

wherein the cell is measured in the CE mode, when a number of times the UE performs repetitions for uplink transmission exceeds the threshold for uplink transmission.

9. The method of claim 1 , wherein the measurement configuration includes a CE mode report information, and

wherein the CE mode report information informs the UE that only a result measured in the CE mode is to be reported among measurement results of the cell.

10. The method of claim 1 , wherein the measurement state information is reported to the network along with at least one of radio link failure information, handover failure information, a logged measurement result, or a measurement result on an MBSFN area.

11. The method of claim 1 , wherein the cell is either an intra-LTE cell or an inter-RAT cell.

12. The method of claim 1 , wherein the UE is in an RRC_IDLE state.

13. A user equipment (UE) reporting a measurement result in a wireless communication system, the UE comprising:

a memory;

a transceiver; and

a processor to connect the memory and the transceiver, wherein the processor is configured to:

control the transceiver to receive a measurement configuration including period information, a predefined first RSRP threshold for a first CE level and a predefined second RSRP threshold for a second CE level, from a network,

wherein the period information informs the UE that a cell is to be measured only in a coverage enhancement (CE) mode during a certain time duration included in the period information;

measure the cell in the CE mode or a non-CE mode, based on the period information, wherein the cell is measured for a longer time in the CE mode than in the non-CE mode,

wherein the cell is measured in the first CE level, when an RSRP of the cell measured by the UE exceeds the first RSRP threshold,

wherein the cell is measured in the second CE level, when the RSRP of the cell measured by the UE is the first RSRP threshold or lower, and when the RSRP of the cell measured by the UE exceeds the second RSRP threshold,

wherein the first RSRP threshold is greater than the second RSRP threshold, and

wherein the second CE level has a wider range of enhanced coverage than the first CE level;

control the transceiver to report the measurement result of the measured cell to the network; and

control the transceiver to report measurement state information including first information which informs the network whether the cell is measured in the CE mode or the non-CE mode, to the network.