Method and apparatus for acquiring system information

1. A method for acquiring, by a user equipment (UE), system information in a wireless communication system, the method comprising:

acquiring system information for a first area and system information for a second area belonging to the first area;

upon entering a third area, acquiring system information for the third area; and

determining whether the first area is changed, based on an identifier related to the first area and an identifier comprised in the system information for the third area,

wherein the identifier related to the first area is obtained based on an identifier related to the second area comprised in the system information for the second area,

wherein the system information for the first area and the system information for the second area are broadcast via different time resources or different frequency resources,

wherein the first area is an area covered by a central unit (CU) of a first next-generation NodeB (gNB), the second area is an area covered by a distributed unit (DU) of the first gNB, and

wherein the CU performs an upper-layer function of a BS, and the DU performs a lower-layer function of the BS.

2. The method of claim 1 , further comprising:

acquiring system information for the changed first area when it is determined that the first area is changed,

wherein the changed first area is an area covered by a CU of a second gNB, and

wherein the third area is an area covered by a DU of the second gNB.

3. The method of claim 1 , further comprising:

keeping the system information for the first area when it is determined that the first area is not changed,

wherein the third area is covered by a DU of the first gNB.

4. The method of claim 1 , wherein the system information for the first area and the system information for the second area belonging to the first area are acquired from the second area.

5. The method of claim 1 , wherein the UE enters the third area by at least one of handover, redirection, or cell reselection.

6. The method of claim 1 , further comprising:

determining whether the system information for the first area or the system information for the second area is changed based on a Value Tag.

7. The method of claim 1 , further comprising:

determining whether to newly acquire the system information for the first area or the system information for the second area based on an indication comprised in a paging message.

8. A user equipment (UE) for acquiring system information 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:

acquire system information for a first area and system information for a second area belonging to the first area;

upon entering a third area, acquire system information for the third area; and

determine whether the first area is changed based on an identifier related to the first area and an identifier comprised in the system information for the third area,

wherein the identifier related to the first area is obtained based on an identifier related to the second area comprised in the system information for the second area,

wherein the system information for the first area and the system information for the second area are broadcast via different time resources or different frequency resources,

wherein the first area is an area covered by a central unit (CU) of a first next-generation NodeB (gNB), the second area is an area covered by a distributed unit (DU) of the first gNB, and

wherein the CU performs an upper-layer function of a BS, and the DU performs a lower-layer function of the BS.

9. The UE of claim 8 ,

wherein the processor is configured to acquire system information for the changed first area when it is determined that the first area is changed,

wherein the changed first area is an area covered by a CU of a second gNB, and

wherein the third area is an area covered by a DU of the second gNB.