Method for configuring central unit by using fronthaul interface, and device for same

1. A method of a central unit (CU) for communicating with a terminal, the method comprising:

receiving network function configuration information of a distributed unit (DU) connected to the CU by using a fronthaul interface;

configuring at least one network function of the CU based on the network function configuration information of the DU; and

transmitting data to the terminal through the DU,

wherein the method comprises:

receiving channel state information about one or more DUs from the terminal;

determining an inter-DU handover of the terminal based on the channel state information; and

reconfiguring the network function of the CU based on network function information configured in a target DU.

2. The method as claimed in claim 1 , wherein the DU configures at least one network function of radio link control (RLC), medium access control (MAC), and physical link (PHY) network functions.

3. The method as claimed in claim 1 , wherein the CU configures at least one network function of radio resource control (RRC), packet data convergence protocol (PDCP), radio link control (RLC), and medium access control (MAC) network functions.

4. The method as claimed in claim 1 , wherein the network function configuration information of the DU comprises at least one piece of DU type information, DU identification information, network function identification information, and network function set identification information.

5. The method as claimed in claim 1 , wherein one of the CU and the DU comprises a network function management entity that manages an activation operation of the network function or a network sub-function.

6. The method as claimed in claim 1 , wherein a fronthaul interface network function configured in the CU calculates and allocates a bandwidth of a fronthaul connecting the CU and the DU.

7. The method as claimed in claim 1 , wherein the CU comprises a backhaul interface processing function between the CU and a core network.

8. A central unit (CU) for communicating with a terminal, the CU comprising:

a receiver for receiving network function configuration information of a distributed unit (DU) connected to the CU by using a fronthaul interface;

a controller for configuring at least one network function of the CU based on the network function configuration information of the DU; and

a transmitter for transmitting data to the terminal through the DU,

wherein:

the receiver receives channel state information about one or more DUs from the terminal, and

the controller determines an inter-DU handover of the terminal based on the channel state information, and reconfigures the network function of the CU based on network function information configured in a target DU.

9. The CU as claimed in claim 8 , wherein the DU configures at least one network function of radio link control (RLC), medium access control (MAC), and physical link (PHY) network functions.

10. The CU as claimed in claim 8 , wherein the CU configures at least one network function of radio resource control (RRC), packet data convergence protocol (PDCP), radio link control (RLC), and medium access control (MAC) network functions.

11. The CU as claimed in claim 8 , wherein the network function configuration information of the DU comprises at least one piece of DU type information, DU identification information, network function identification information, and network function set identification information.

12. The CU as claimed in claim 8 , wherein one of the CU and the DU comprises a network function management entity that manages an activation operation of the network function or a network sub-function.

13. The CU as claimed in claim 8 , wherein a fronthaul interface network function configured in the CU calculates and allocates a bandwidth of a fronthaul connecting the CU and the DU.

14. The CU as claimed in claim 8 , wherein the controller performs backhaul interface processing between the CU and a core network.