Method for performing cell reselection procedure by terminal, and apparatus supporting same

1. A method for performing, by a user equipment (UE), a cell reselection procedure in a wireless communication system, the method comprising:

measuring a first CE level in a serving cell on which the UE is currently camping;

measuring a second CE level in a neighboring cell that provides an MBMS service of interest;

adding an offset to a measured quality value of the neighboring cell to calculate a ranking of the neighboring cell, based on the second CE level being equal to or better than the first CE level;

performing a cell reselection procedure based on the calculated ranking;

receiving the MBMS service of interest through the neighboring cell to which the offset is given after performing the reselection procedure; and

releasing the offset given to the neighboring cell.

2. The method of claim 1 , wherein the performing of a cell reselection procedure comprises reselecting a cell having a high ranking for a preset time interval for performing the cell reselection procedure.

3. The method of claim 1 , wherein the UE supports NB-IoT, and

the MBMS service is provided through SC-PTM transmission.

4. The method of claim 1 , wherein the first CE level and the second CE level are measured in a unit of an MBMS service, TMGI, or a frequency that provides the MBMS service.

5. The method of claim 1 , wherein the first CE level and the second CE level are determined by comparing measured Reference Signal Received Power (RSRP) of the serving cell and the neighboring cell and a CE level related threshold value received from a network.

6. The method of claim 5 , wherein the CE level related threshold value is received through an MCCH, SC-MCCH, or PDCCH.

7. The method of claim 1 , further comprising initiating an RRC connection establishment procedure after the releasing of the offset.

8. A user equipment (UE) configured to perform a cell reselection procedure in a wireless communication system, the UE comprising:

a memory;

a transceiver; and

a processor for connecting the memory and the transceiver,

wherein the processor is configured to:

measure a first CE level in a serving cell on which the UE is currently camping;

measure a second CE level in a neighboring cell that provides an MBMS service of interest;

add an offset to a measured quality value of the neighboring cell to calculate a ranking of the neighboring cell, based on the second CE level being equal to or better than the first CE level;

perform a cell reselection procedure based on the calculated ranking;

receive the MBMS service of interest through the neighboring cell to which the offset is given after performing the reselection procedure; and

release the offset given to the neighboring cell.

9. The UE of claim 8 , wherein the processor is configured to reselect a cell having a high ranking for a preset time interval for performing the cell reselection procedure.

10. The UE of claim 8 , wherein the UE supports NB-IoT, and

the MBMS service is provided through SC-PTM transmission.

11. The UE of claim 8 , wherein the processor is configured to measure a first CE level and a second CE level in a unit of an MBMS service, TMGI, or a frequency that provides the MBMS service.

12. The UE of claim 8 , wherein the processor is configured to compare measured Reference Signal Received Power (RSRP) of the serving cell and the neighboring cell and a CE level related threshold value received from a network to determine the first CE level and the second CE level.

13. The UE of claim 12 , wherein the CE level related threshold value is transmitted to the UE through a MCCH, SC-MCCH, or PDCCH.