Method of cell reselection in non-public network and related device

1. A method performed by a user equipment (UE) for cell reselection in a non-public network (NPN), the method comprising:

receiving, from a first cell via a first System Information Block 1 (SIB1), a first information element including a first network identity associated with a first indication;

receiving, from a second cell via a second SIB1, a second information element including a second network identity associated with a second indication;

selecting one of the first network identity and the second network identity;

determining whether the first indication is present in the first information element and whether the first network identity is selected by the UE;

determining the first cell as barred for the cell reselection when the first indication is present, but the first network identity is not selected by the UE; and

determining the first cell as a candidate cell for the cell reselection when the first indication is present and the first network identity is selected by the UE,

wherein:

the first indication indicates whether the first cell supports integrated access and backhaul (IAB) functionality, and

the first network identity is different from the second network identity.

2. The method of claim 1 , further comprising:

determining the first cell as barred for the cell reselection when the first indication is absent in the first information element.

3. The method of claim 1 , wherein:

the first network identity is an NPN identity including a single non-public network (SNPN) identity and a public network integrated non-public network (PNI-NPN) identity, and

the second network identity is a public land mobile network (PLMN) identity.

4. The method of claim 1 , wherein the UE supports the IAB functionality.

5. The method of claim 1 , further comprising:

transmitting, by a Non-Access Stratum (NAS) layer of the UE, to an Access Stratum (AS) layer of the UE, a third indication indicating that the UE supports the JAB functionality; and

determining, by the AS layer of the UE, that the UE supports the JAB functionality when receiving the third indication from the NAS layer of the UE.

6. The method of claim 5 , wherein the third indication is associated with a third network identity including a public land mobile network (PLMN) identity, a single non-public network (SNPN) identity, a public network integrated non-public network (PNI-NPN) identity, a closed access group (CAG) identity, and a network identifier (ND).

7. The method of claim 1 , wherein the first indication indicates that the first cell supports the JAB functionality when the first indication is present.

8. The method of claim 1 , further comprising:

ignoring the first indication when the UE does not support the JAB functionality.

9. The method of claim 1 , further comprising:

ignoring the second indication when the second network identity is not selected by the UE.

10. The method of claim 1 , wherein the first indication indicates that the first cell supports the JAB functionality when the first indication is present and is configured with a first value.

11. A user equipment (UE) for performing a cell reselection in a non-public network (NPN), the UE comprising:

at least one processor for executing computer-executable instructions; and

at least one memory coupled to the at least one processor for storing the computer-executable instructions, wherein the computer-executable instructions, when executed by the at least one processor, instruct the UE to:

receive, from a first cell via a first System Information Block 1 (SIB1), a first information element including a first network identity associated with a first indication;

receive, from a second cell via a second SIB1, a second information element including a second network identity associated with a second indication;

select one of the first network identity and the second network identity;

determine whether the first indication is present in the first information element and whether the first network identity is selected by the UE;

determine the first cell as barred for the cell reselection when the first indication is present, but the first network identity is not selected by the UE; and

determine the first cell as a candidate cell for the cell reselection when the first indication is present and the first network identity is selected by the UE,

wherein:

the first indication indicates whether the first cell supports integrated access and backhaul (IAB) functionality, and

the first network identity is different from the second network identity.

12. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one processor, further instruct the UE to:

determine the first cell as barred for the cell reselection when the first indication is absent in the first information element.

13. The UE of claim 11 , wherein the first network identity is an NPN identity including a single non-public network (SNPN) identity and a public network integrated non-public network (PNI-NPN) identity, and the second network identity is a public land mobile network (PLMN) identity, wherein:

the first network identity is an NPN identity including a single non-public network (SNPN) identity and a public network integrated non-public network (PNI-NPN) identity, and

the second network identity is a public land mobile network (PLMN) identity.

14. The UE of claim 11 , wherein the UE supports the IAB functionality.

15. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one processor, further instruct the UE to:

transmit, by a Non-Access Stratum (NAS) layer of the UE, to an Access Stratum (AS) layer of the UE, a third indication indicating that the UE supports the IAB functionality; and

determine, by the AS layer of the UE, that the UE supports the IAB functionality when receiving the third indication from the NAS layer of the UE.

16. The UE of claim 15 , wherein the third indication is associated with a third network identity including a public land mobile network (PLMN) identity, a single non-public network (SNPN) identity, a public network integrated non-public network (PNI-NPN) identity, a closed access group (CAG) identity, and a network identifier (NID).

17. The UE of claim 11 , wherein the first indication indicates that the first cell supports the IAB functionality when the first indication is present.

18. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one processor, further instruct the UE to:

ignore the first indication when the UE does not support the IAB functionality.

19. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one processor, further instruct the UE to:

ignore the second indication when the second network identity is not selected by the UE.

20. The UE of claim 11 , wherein the first indication indicates the first cell supports the IAB functionality when the first indication is present and is configured with a first value.