Node selection for network sharing

1. A method comprising:

receiving, by a first base station central unit from a second base station central unit, a first message comprising a second public land mobile network (PLMN) identifier of a second PLMN comprising the second base station central unit,

transmitting, by the first base station central unit to a base station distributed unit, a second message comprising:

a first PLMN identifier of a first PLMN comprising the first base station central unit, and

the second PLMN identifier of the second PLMN;

receiving, by the first base station central unit from the base station distributed unit a radio resource control message indicating the first PLMN.

2. The method of claim 1 , further comprising:

configuring, by the base station distributed unit at least one system information block comprising the first PLMN identifier and the second PLMN identifiers; and

transmitting, by the base station distributed unit to a wireless device, the at least one system information block.

3. The method of claim 2 further comprising:

receiving, by the base station distributed unit from the wireless device a radio resource control message indicating at least one PLMN of the first and the second PLMN;

determining, by the base station distributed unit based on the at least one PLMN, at least one base station central unit from:

the first base station central unit of the first PLMN; and

the second base station central unit of the second PLMN; and

transmitting, by the base station distributed unit to the at least one base station central unit, the radio resource control message.

4. The method of claim 1 , wherein the radio resource control message comprises at least one of:

a radio resource control complete message;

a radio resource control request message;

a radio resource control resume complete message; or

a radio resource control resume request message.

5. The method of claim 1 , further comprising:

transmitting, by at least one base station central unit to the base station distributed unit, a radio resource control setup message comprising cell configuration parameters for the wireless device, wherein the radio resource control setup message is a response for the radio resource control message; and

transmitting, by the base station distributed unit to the wireless device, the radio resource control setup message.

6. The method of claim 5 , further comprising:

transmitting, by at least one base station central unit to the base station distributed unit, a configuration request message for the wireless device; and

receiving, by the at least one base station central unit from the base station distributed unit, a configuration response message comprising the cell configuration parameters, wherein the radio resource control setup message is based on the configuration response message.

7. The method of claim 1 , further comprising:

transmitting, by at least one base station central unit to the base station distributed unit, packets for the wireless device.

8. The method of claim 3 , wherein the receiving the radio resource control message comprises receiving the radio resource control message via a cell that is shared for the first PLMN and the second PLMN.

9. The method of claim 3 , wherein the receiving the radio resource control message comprises receiving the radio resource control message via at least one of:

a first cell of the first PLMN; or

a second cell of the second PLMN.

10. The method of claim 2 , wherein the transmitting the at least one system information block comprises at least one of:

transmitting the at least one system information block via a cell that is shared for the first PLMN and the second PLMN;

transmitting a first system information block comprising a first PLMN identifier of the first PLMN via a first cell of the first PLMN; or

transmitting a second system information block comprising a second PLMN identifier of the second PLMN via a second cell of the second PLMN.

11. The method of claim 1 , wherein the radio resource control message comprises one or more parameters for the at least one PLMN, the one or more parameters comprising at least one of:

at least one PLMN identifier of the at least one PLMN;

a cell identifier of a cell that the base station distributed unit receives the radio resource control message via;

a tracking area code of the cell;

a registration area code of the cell;

a first cell identifier of a first cell associated with the first PLMIN;

a second cell identifier of a second cell associated with the second PLMN;

a base station central unit identifier of at least one base station central unit; or

a base station identifier of a base station associated with at least one base station central unit.

12. The method of claim 3 , wherein the determining the at least one base station central unit is further based on the one or more parameters for the at least one PLMN.

13. The method of claim 2 , further comprising configuring, by the base station distributed unit, radio resources for the wireless device.

14. The method of claim 2 , wherein the wireless device is allowed to access the at least one PLMN.

15. The method of claim 2 , wherein the at least one system information block comprises at least one of:

a first system information block comprising a first PLMN identifier of the first PLMN, the first system information block transmitted via a first cell of the first PLMN; or

a second system information block comprising a second PLMN identifier of the second PLMN, the second system information block transmitted via a second cell of the second PLMN.

16. The method of claim 2 , wherein the at least one system information block comprises a system information block 1.

17. The method of claim 1 , wherein a base station comprises the first base station central unit, the second base station central unit, and the base station distributed unit.

18. The method of claim 1 , wherein:

a first base station comprises the first base station central unit and the base station distributed unit; and

a second base station comprises the second base station central unit and the base station distributed unit.

19. The method of claim 1 , wherein the base station distributed unit serves at least one of: a cell shared by the first PLMN and the second PLMN;

a first cell of the first PLMN; or

a second cell of the second PLMN.