Periodic radio resource

1. A method comprising:

receiving, by a base station central unit from a base station distributed unit, configuration parameters of at least one periodic radio resource for packet transmissions of a wireless device in a radio resource control (RRC) inactive state or an RRC idle state;

sending, by the base station central unit to the base station distributed unit, a wireless device context release message comprising:

an RRC release message; and

an indication that the base station distributed unit maintains the at least one periodic radio resource after the wireless device transitions to the RRC idle state or the RRC inactive state; and

receiving, by the base station central unit, via the base station distributed unit, data from the wireless device while the wireless device is in the RRC inactive state or the RRC idle state.

2. The method of claim 1 , further comprising sending, by the base station central unit to the wireless device, one or more RRC messages comprising the configuration parameters of the at least one periodic radio resource.

3. The method of claim 1 , wherein the wireless device context release message indicates for the base station distributed unit to release or suspend one or more access-stratum contexts of the wireless device.

4. The method of claim 1 , wherein the at least one periodic radio resource is for the base station distributed unit to receive one or more transport blocks from the wireless device while the wireless device is in the RRC inactive state or the RRC idle state.

5. The method of claim 1 , wherein the configuration parameters of the at least one periodic radio resource are sent to the wireless device in one or more RRC messages.

6. The method of claim 1 , wherein the RRC release message is for the wireless device.

7. The method of claim 1 , wherein the RRC release message indicates for the wireless device to transition to the RRC inactive state or the RRC idle state.

8. A base station central unit comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the base station central unit to:

receive, from a base station distributed unit, configuration parameters of at least one periodic radio resource for packet transmissions of a wireless device in a radio resource control (RRC) inactive state or an RRC idle state;

send, to the base station distributed unit, a wireless device context release message comprising:

an RRC release message; and

an indication that the base station distributed unit maintains the at least one periodic radio resource after the wireless device transitions to the RRC idle state or the RRC inactive state; and

receive, via the base station distributed unit, data from the wireless device while the wireless device is in the RRC inactive state or the RRC idle state.

9. The base station central unit of claim 8 , wherein the instructions cause the base station central unit to send, to the wireless device, one or more RRC messages comprising the configuration parameters of the at least one periodic radio resource.

10. The base station central unit of claim 8 , wherein the wireless device context release message indicates for the base station distributed unit to release or suspend one or more access-stratum contexts of the wireless device.

11. The base station central unit of claim 8 , wherein the at least one periodic radio resource is for the base station distributed unit to receive one or more transport blocks from the wireless device while the wireless device is in the RRC inactive state or the RRC idle state.

12. The base station central unit of claim 8 , wherein the configuration parameters of the at least one periodic radio resource are sent to the wireless device in one or more RRC messages.

13. The base station central unit of claim 8 , wherein the RRC release message is for the wireless device.

14. The base station central unit of claim 8 , wherein the RRC release message indicates for the wireless device to transition to the RRC inactive state or the RRC idle state.

15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to:

receive, from a base station distributed unit, configuration parameters of at least one periodic radio resource for packet transmissions of a wireless device in a radio resource control (RRC) inactive state or an RRC idle state;

send, to the base station distributed unit, a wireless device context release message comprising:

an RRC release message; and

an indication that the base station distributed unit maintains the at least one periodic radio resource after the wireless device transitions to the RRC idle state or the RRC inactive state; and

receive, via the base station distributed unit, data from the wireless device while the wireless device is in the RRC inactive state or the RRC idle state.

16. The non-transitory computer-readable medium of claim 15 , wherein the instructions cause the one or more processors to send, to the wireless device, one or more RRC messages comprising the configuration parameters of the at least one periodic radio resource.

17. The non-transitory computer-readable medium of claim 15 , wherein the wireless device context release message indicates for the base station distributed unit to release or suspend one or more access-stratum contexts of the wireless device.

18. The non-transitory computer-readable medium of claim 15 , wherein the at least one periodic radio resource is for the base station distributed unit to receive one or more transport blocks from the wireless device while the wireless device is in the RRC inactive state or the RRC idle state.

19. The non-transitory computer-readable medium of claim 15 , wherein the configuration parameters of the at least one periodic radio resource are sent to the wireless device in one or more RRC messages.

20. The non-transitory computer-readable medium of claim 15 , wherein the RRC release message is for the wireless device.