Contention free random access failure

1. A method comprising:

receiving, by a distributed unit associated with a base station from a central unit associated with the base station, a first message comprising cell configuration parameters of a cell;

sending, by the distributed unit to the central unit, an indication of a random access (RA) resource of the cell for a wireless device; and

based on determining that the distributed unit did not receive at least one RA preamble from the wireless device via the RA resource of the cell after the sending the indication, sending, by the distributed unit to the central unit, an RA failure indication associated with the wireless device.

2. The method of claim 1 , further comprising receiving, by the distributed unit from the wireless device via the cell, one or more transport blocks.

3. The method of claim 2 , further comprising sending, by the distributed unit, the one or more transport blocks.

4. The method of claim 1 , further comprising sending, by the distributed unit to the wireless device, an indication of the at least one RA preamble for random access to the cell.

5. The method of claim 1 , further comprising:

monitoring, by the distributed unit, the RA resource of the cell, wherein the monitoring comprises determining whether the distributed unit receives the at least one RA preamble from the wireless device via the RA resource of the cell.

6. The method of claim 1 , further comprising sending, by the distributed unit to the wireless device, information describing the at least one RA preamble for random access to the cell.

7. The method of claim 1 , further comprising:

storing, by the distributed unit, the cell configuration parameters.

8. A method comprising:

sending, by a distributed radio access network (RAN) entity to a central RAN entity, an indication of a random access (RA) resource of a cell for a wireless device; and

based on determining that the distributed RAN entity did not receive at least one RA preamble from the wireless device via the RA resource of the cell after the sending the indication, sending, by the distributed RAN entity to the central RAN entity, a first message that indicates an RA failure associated with the wireless device.

9. The method of claim 8 , further comprising:

storing, by the distributed RAN entity, configurations of the cell for the wireless device.

10. The method of claim 8 , further comprising sending, by the distributed RAN entity to the wireless device, a radio resource control (RRC) message.

11. The method of claim 8 , further comprising releasing, by the distributed RAN entity and based on determining that the distributed RAN entity did not receive the at least one RA preamble from the wireless device, a wireless device context for the wireless device.

12. The method of claim 8 , further comprising receiving, by the distributed RAN entity from the central RAN entity, a configuration request for the cell and for the wireless device.

13. The method of claim 12 , further comprising sending, by the distributed RAN entity to the central RAN entity, an indication of the RA resource for random access to the cell.

14. The method of claim 13 , further comprising receiving, by the distributed RAN entity from the central RAN entity, an RRC message that comprises the indication of the RA resource.

15. A method comprising:

sending, by a central unit associated with a base station to a distributed unit associated with the base station, a first message comprising cell configuration parameters of a cell;

receiving, by the central unit from the distributed unit, an indication of a random access (RA) resource of the cell and for a wireless device;

sending, by the central unit to the wireless device, a radio resource control message comprising the indication of the RA resource of the cell; and

receiving, by the central unit from the distributed unit, an RA failure indication associated with the wireless device, wherein the RA failure indication indicates a reception failure, by the distributed unit, of an RA preamble via the RA resource of the cell.

16. The method of claim 15 , wherein the RA resource comprises an indication of at least one of:

a secondary cell synchronization, or

a handover of the wireless device.

17. The method of claim 15 , wherein the indication of the RA resource comprises an indication of a synchronization signal block of the cell.

18. The method of claim 15 , wherein the sending the radio resource control message is via a second distributed unit.

19. The method of claim 15 , further comprising receiving, by the central unit from the wireless device and based on the radio resource control message, a radio resource control complete message.

20. The method of claim 15 , wherein the sending the radio resource control message is via the distributed unit.

21. A distributed unit, associated with a base station, comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, configure the distributed unit to:

receive, from a central unit associated with the base station, a first message comprising cell configuration parameters of a cell;

send, to the central unit, an indication of a random access (RA) resource of the cell for a wireless device; and

based on determining that the distributed unit did not receive at least one RA preamble from the wireless device via the RA resource of the cell after sending the indication, send, to the central unit, an RA failure indication associated with the wireless device.

22. The distributed unit of claim 21 , wherein the instructions, when executed by the one or more processors, further configure the distributed unit to monitor the RA resource of the cell by determining whether the distributed unit receives the at least one RA preamble from the wireless device via the RA resource of the cell.

23. The distributed unit of claim 21 , wherein the instructions, when executed by the one or more processors, further configure the distributed unit to send one or more transport blocks received from the wireless device.

24. The distributed unit of claim 21 , wherein the instructions, when executed by the one or more processors, further configure the distributed unit to send, to the wireless device, an indication of the at least one RA preamble for random access to the cell.

25. A distributed radio access network (RAN) entity comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, configure the distributed RAN entity to:

send, to a central RAN entity, an indication of a random access (RA) resource of a cell for a wireless device; and

based on determining that the distributed RAN entity did not receive at least one RA preamble from the wireless device via the RA resource of the cell after sending the indication, send, to the central RAN entity, a first message that indicates an RA failure associated with the wireless device.

26. The distributed RAN of claim 25 , wherein the instructions, when executed by the one or more processors, further configure the distributed RAN entity to store configurations of the cell for the wireless device.

27. The distributed RAN of claim 25 , wherein the instructions, when executed by the one or more processors, further configure the distributed RAN entity to send, to the wireless device, a radio resource control (RRC) message.

28. The distributed RAN of claim 25 , wherein the instructions, when executed by the one or more processors, further configure the distributed RAN entity to release, based on determining that the distributed RAN entity did not receive the at least one RA preamble from the wireless device, a wireless device context for the wireless device.

29. The distributed RAN of claim 25 , wherein the instructions, when executed by the one or more processors, further configure the distributed RAN entity to receive, from the central RAN entity, a configuration request for the cell and for the wireless device.

30. The distributed RAN of claim 25 , wherein the instructions, when executed by the one or more processors, further configure the distributed RAN entity to receive, from the central RAN entity, an RRC message that comprises the indication of the RA resource.

31. A central unit, associated with a base station, comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, configure the central unit to:

send, to a distributed unit associated with the base station, a first message comprising cell configuration parameters of a cell;

receive, from the distributed unit, an indication of a random access (RA) resource of the cell and for a wireless device;

send, to the wireless device, a radio resource control message comprising the indication of the RA resource of the cell; and

receive, from the distributed unit, an RA failure indication associated with the wireless device, wherein the RA failure indication indicates a reception failure, by the distributed unit, of an RA preamble via the RA resource of the cell.

32. The central unit of claim 31 , wherein the RA resource comprises an indication of at least one of:

a secondary cell synchronization, or

a handover of the wireless device.

33. The central unit of claim 31 , wherein the indication of the RA resource comprises an indication of a synchronization signal block of the cell.

34. The central unit of claim 31 , wherein the instructions, when executed by the one or more processors, configure the central unit to send the radio resource control message via a second distributed unit.

35. The central unit of claim 31 , wherein the instructions, when executed by the one or more processors, further configure the central unit to receive, from the wireless device and based on the radio resource control message, a radio resource control complete message.

36. The central unit of claim 31 , wherein the instructions, when executed by the one or more processors, configure the central unit to send the radio resource control message via the distributed unit.

37. A non-transitory computer-readable medium storing instructions that, when executed, configure a distributed unit associated with a base station to:

receive, from a central unit associated with the base station, a first message comprising cell configuration parameters of a cell;

send, to the central unit, an indication of a random access (RA) resource of the cell for a wireless device; and

based on determining that the distributed unit did not receive at least one RA preamble from the wireless device via the RA resource of the cell after sending the indication, send, to the central unit, an RA failure indication associated with the wireless device.

38. The non-transitory computer-readable medium of claim 37 , wherein the instructions, when executed, further configure the distributed unit to monitor the RA resource of the cell by determining whether the distributed unit receives the at least one RA preamble from the wireless device via the RA resource of the cell.

39. The non-transitory computer-readable medium of claim 37 , wherein the instructions, when executed, further configure the distributed unit to send one or more transport blocks received from the wireless device.

40. The non-transitory computer-readable medium of claim 37 , wherein the instructions, when executed, further configure the distributed unit to send, to the wireless device, an indication of the at least one RA preamble for random access to the cell.

41. A non-transitory computer-readable medium storing instructions that, when executed, configure a distributed radio access network (RAN) entity to:

send, to a central RAN entity, an indication of a random access (RA) resource of a cell for a wireless device; and

based on determining that the distributed RAN entity did not receive at least one RA preamble from the wireless device via the RA resource of the cell after sending the indication, send, to the central RAN entity, a first message that indicates an RA failure associated with the wireless device.

42. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further configure the distributed RAN entity to store configurations of the cell for the wireless device.

43. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further configure the distributed RAN entity to send, to the wireless device, a radio resource control (RRC) message.

44. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, further configure the distributed RAN entity to release, based on determining that the distributed RAN entity did not receive the at least one RA preamble from the wireless device, a wireless device context for the wireless device.

45. A system comprising:

a distributed unit associated with a base station; and

a central unit, associated with the base station, configured to:

send, to the distributed unit, a first message comprising cell configuration parameters of a cell,

wherein the distributed unit is configured to:

send, to the central unit, an indication of a random access (RA) resource of the cell for a wireless device; and

based on determining that the distributed unit did not receive at least one RA preamble from the wireless device via the RA resource of the cell after sending the indication, send, to the central unit, an RA failure indication associated with the wireless device.

46. The system of claim 45 , wherein the central unit is further configured to:

send, to the wireless device, a radio resource control message comprising the indication of the RA resource of the cell.

47. The system of claim 45 , wherein the distributed unit is further configured to send, to the wireless device, an indication of the at least one RA preamble for random access to the cell.

48. The system of claim 45 , wherein the distributed unit is further configured to release, based on determining that the distributed unit did not receive the at least one RA preamble from the wireless device, a wireless device context for the wireless device.

49. The system of claim 45 , wherein the central unit is further configured to send, to the distributed unit, a configuration request for the cell and for the wireless device.