Method and apparatus for receiving authorization information on network slice

1. A method for receiving, by a base station (BS), authorization information on a network slice in a wireless communication system, the method comprising:

receiving an attach request from a user equipment (UE);

if the attach request includes a temporary identity (ID) indicating a common control plane function (C-CPF) corresponding to a particular network slice, transmitting the received attach request including the temporary ID to the indicated C-CPF corresponding to the particular network slice;

if the attach request does not include the temporary ID indicating the C-CPF:

selecting a C-CPF corresponding to a particular network slice based on the attach request; and

transmitting the received attach request to the selected C-CPF; and

receiving authorization information, which indicates whether the UE is authorized to use the particular network slice, from the indicated or selected C-CPF.

2. The method of claim 1 , further comprising:

storing the received authorization information in UE context.

3. The method of claim 1 , wherein whether the UE is authorized to use the particular network slice is determined by the selected C-CPF when the attach request does not include the temporary ID indicating the C-CPF.

4. The method of claim 3 , wherein whether the UE is authorized to use the particular network slice is determined based on subscription data or a capability of the UE.

5. The method of claim 1 , wherein the C-CPF corresponding to the particular network slice is selected by a network slice selection function (NSSF) and a control plane selection function (CPSF) when the attach request does not include the temporary ID indicating the C-CPF.

6. The method of claim 5 , wherein the NSSF and the CPSF are comprised in the BS.

7. The method of claim 1 , wherein the attach request comprises information on a service desired by the UE.

8. The method of claim 7 , wherein the particular network slice is determined by an NFFS based on the information on the service desired by the UE.

9. The method of claim 8 , wherein the particular network slice is a network slice providing the service desired by the UE.

10. The method of claim 1 , further comprising:

receiving an indicator indicating whether the attach request is allowed from the selected C-CPF.

11. The method of claim 10 , further comprising:

transmitting the indicator indicating whether the attach request is allowed to the UE.

12. The method of claim 1 , wherein the C-CPF is an access and mobility function (AMF).

13. A base station (BS) receiving authorization information on a network slice in a wireless communication system, the BS comprising:

a memory;

a transceiver; and

a processor, coupled to the memory and the transceiver, that:

controls the transceiver to receive an attach request from a user equipment (UE);

if the attach request includes a temporary identity (ID) indicating a common control plane function (C-CPF) corresponding to a particular network slice, controls the transceiver to transmit the received attach request including the temporary ID to the indicated C-CPF corresponding to the particular network slice;

if the attach request does not include the temporary ID indicating the C-CPF:

selects a C-CPF corresponding to a particular network slice based on the attach request; and

controls the transceiver to transmit the received attach request to the selected C-CPF; and

controls the transceiver to receive authorization information, which indicates whether the UE is authorized to use the particular network slice, from the indicated or selected C-CPF.

14. The BS of claim 13 , wherein the processor stores the received authorization information in UE context.

15. The BS of claim 13 , wherein whether the UE is authorized to use the particular network slice is determined by the selected C-CPF when the attach request does not include the temporary ID indicating the C-CPF.