Wireless communication method and system for network slicing

1. A wireless communication method performed by a user equipment (UE), the method comprising:

sending first information to a first base station via a radio resource control (RRC) message, the first information comprising a UE identifier (ID) and single network slice selection assistance information (S-NSSAI);

receiving second information, the second information indicating whether a requested network slice is supported or rejected;

establishing a first RRC connection with the first base station after determining that the second information indicates the requested network slice is rejected; and

establishing a second RRC connection with a second base station as a secondary node while maintaining the first RRC connection with the first base station after determining that the second base station does not support the requested network slice,

wherein the second information includes a cause of the rejection of the requested network slice.

2. The wireless communication method of claim 1 , wherein the second information is generated by an Access and Mobility Management Function (AMF) in response to the S-NSSAI.

3. The wireless communication method of claim 1 , further comprising establishing the first RRC connection with the first base station after determining that the second information indicates the requested network slice is supported.

4. The wireless communication method of claim 1 , further comprising: performing a mobility management procedure to connect with a third base station supporting the requested network slice after determining that the second information indicates the requested network slice is rejected.

5. A user equipment (UE), comprising:

at least one non-transitory computer-readable medium having computer-executable instructions embodied thereon; and

at least one processor coupled to the at least one non-transitory computer-readable medium, and configured to execute the computer-executable instructions to:

send first information to a first base station via a radio resource control (RRC) message, the first information comprising a UE identifier (ID) and single network slice selection assistance information (S-NSSAI);

receive second information, the second information indicating whether a requested network slice is supported or rejected;

establish a first RRC connection with the first base station after determining that the second information indicates the requested network slice is rejected; and

establish a second RRC connection with a second base station as a secondary node while maintaining the first RRC connection with the first base station after determining that the second base station does not support the requested network slice,

wherein the second information includes a cause of the rejection of the requested network slice.

6. The UE of claim 5 , wherein the second information is generated by an Access and Mobility Management Function (AMF) in response to the S-NSSAI.

7. The UE of claim 5 , wherein the at least one processor is further configured to establish the first RRC connection with the first base afte determining that when the second information indicates the requested network slice is supported.

8. The UE of claim 5 , wherein the at least one processor is further configured to perform a mobility management procedure to connect with a third base station supporting the requested network slice after determining that the second information indicates the requested network slice is rejected.

9. A wireless communication method performed by a first base station, comprising:

receiving, by the first base station, first information from a user equipment (UE) via a radio resource control (RRC) message, the first information comprising a UE identifier (ID) and single network slice selection assistance information (S-NSSAI);

sending, by the first base station, second information to the UE, the second information indicating whether a requested network slice is supported or rejected;

establishing a first RRC connection between the first base station and the UE after it is determined that the second information indicates the requested network slice is rejected; and

establishing a second RRC connection between the UE and a second base station as a secondary node while maintaining the first RRC connection between the first base station and the UE after it is determined that the second base station does not support the requested network slice,

wherein the second information includes a cause of the rejection of the requested network slice.

10. The wireless communication method of claim 9 , wherein the second information is generated by an Access and Mobility Management Function (AMF) in response to the S-NSSAI.

11. The wireless communication method of claim 9 , further comprising establishing the first RRC connection between the UE and the first base station after it is determined that the second information indicates the requested network slice is supported.

12. The wireless communication method of claim 9 , further comprising:

selecting, by the first base station, a third base station supporting the requested network slice in response to the S-NSSAI after it is determined that the second information indicates the requested network slice is rejected; and

performing, by the first base station, a mobility management procedure to connect with the third base station.

13. The wireless communication method of claim 12 , further comprising:

exchanging, by the first base station, control signaling with other base stations, wherein the control signaling includes the S-NSSAI.

14. The wireless communication method of claim 13 , wherein the control signaling includes beam information of the other base stations.