Method for reporting mobility information in wireless communication system and apparatus for supporting same

1. A method for reporting mobility state estimation (MSE) information and mobility history information, performed by a user equipment, UE, in a wireless communication system, the method comprising:

generating the MSE information and the mobility history information; and

transmitting the MSE information and the mobility history information to a network,

wherein, when the UE moves from a first cell to a second cell, the mobility history information includes entry information indicating a mobility history entry for the first cell,

wherein the mobility history information includes a fixed maximum number of entries corresponding to recently camped cells, which is used as a condition for discarding the mobility history entry,

wherein the MSE information is used to represent a mobility state of the UE as a high mobility state, a medium mobility state and a normal mobility state, and

wherein the mobility state of the UE is determined by a number of handover or cell reselection attempts by the UE.

2. The method of claim 1 , wherein the first cell supports a first radio access technology (RAT) and the second cell supports a second radio access technology (RAT).

3. The method of claim 2 , wherein the first RAT and the second RAT are different from each other.

4. The method of claim 1 , wherein the entry information includes a global cell identity or a physical cell identity of the first cell.

5. The method of claim 4 , wherein the entry information includes time information indicating time spent in the first cell of the UE in an RRC idle state.

6. The method of claim 1 , wherein the first cell is a primary cell.

7. The method of claim 1 , wherein the entry information is included in the mobility history information after removing an oldest entry of the mobility history information.

8. The method of claim 1 , wherein the mobility history information is generated in a radio resource control, RRC, connected state or in an RRC_idle state of the UE.

9. The method of claim 1 , wherein the mobility state of the UE is represented by two bits included in the MSE information.

10. A user equipment (UE) for reporting mobility state estimation (MSE) information and mobility history information in a wireless communication system, the UE comprising:

a radio frequency, RF, unit for transmitting and receiving a radio signal; and

a processor coupled with the RF unit,

wherein the processor is configured to:

generate the MSE information and the mobility history information; and

transmit the MSE information and the mobility history information to a network,

wherein when the UE moves from a first cell to a second cell, the mobility history information includes entry information indicating a mobility history entry for the first cell,

wherein the mobility history information includes a fixed maximum number of entries corresponding to recently camped cells, which is used as a condition for discarding the mobility history entry,

wherein the MSE information is used to represent a mobility state of the UE as a high mobility state, a medium mobility state and a normal mobility state, and

wherein the mobility state of the UE is determined by a number of handover or cell reselection attempts by the UE.

11. The UE of claim 10 , wherein the first cell supports a first radio access technology (RAT) and the second cell supports a second radio access technology (RAT).

12. The UE of claim 11 , wherein the first RAT and the second RAT are different from each other.

13. The UE of claim 10 , wherein the entry information includes a global cell identity or a physical cell identity of the first cell.

14. The UE of claim 13 , wherein the entry information includes time information indicating time spent in the first cell of the UE in an RRC idle state.

15. The UE of claim 10 , wherein the first cell is a primary cell.

16. The UE of claim 10 , wherein the mobility state of the UE is represented by two bits included in the MSE information.