Early data transmission

1. A method comprising:

receiving, by a first base station from a second base station, a first message comprising a context of a wireless device;

sending, by the first base station, a radio resource control (RRC) message to the wireless device;

determining, by the first base station, that reception of the RRC message by the wireless device has failed; and

sending, by the first base station to the second base station and based on the determining, a second message indicating that a connection setup with the wireless device has failed, wherein the second message comprises downlink data for the wireless device.

2. The method of claim 1 , further comprising receiving, by the first base station from the wireless device, a first RRC message indicating a request to resume an RRC connection between the wireless device and the first base station.

3. The method of claim 2 , wherein the RRC message sent to the wireless device is a second RRC message that is based on the receiving of the first RRC message.

4. The method of claim 1 , further comprising sending, by the first base station to the second base station, before the receiving the first message comprising the context of the wireless device, a request message comprising a request to retrieve the context of the wireless device.

5. The method of claim 4 , wherein the request message comprises one or more of:

uplink data of the wireless device; and

release assistance information (RAI) of the wireless device.

6. The method of claim 1 , wherein the first message comprises the downlink data for the wireless device.

7. The method of claim 6 , wherein the RRC message is:

an RRC resume message comprising the downlink data; or

an RRC release message comprising the downlink data.

8. The method of claim 1 , wherein the second message comprises the context of the wireless device.

9. The method of claim 1 , wherein the second message comprises a cause value indicating:

a failure to transmit an RRC message to the wireless device; or

a failure to receive an RRC response message from the wireless device.

10. A first base station comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the first base station to:

receive, from a second base station, a first message comprising a context of a wireless device;

send a radio resource control (RRC) message to the wireless device;

determine that reception of the RRC message by the wireless device has failed; and

send, to the second base station and based on the determining, a second message indicating that a connection setup with the wireless device has failed, wherein the second message comprises downlink data for the wireless device.

11. The first base station of claim 10 , wherein the instructions further cause the first base station to receive, from the wireless device, a first RRC message indicating a request to resume an RRC connection between the wireless device and the first base station.

12. The first base station of claim 11 , wherein the RRC message sent to the wireless device is a second RRC message that is based on the receiving of the first RRC message.

13. The first base station of claim 10 , wherein the instructions further cause the first base station to send, to the second base station, before the receiving the first message comprising the context of the wireless device, a request message comprising a request to retrieve the context of the wireless device.

14. The first base station of claim 13 , wherein the request message comprises one or more of:

uplink data of the wireless device; and

release assistance information (RAI) of the wireless device.

15. The first base station of claim 10 , wherein the first message comprises the downlink data for the wireless device.

16. The first base station of claim 15 , wherein the RRC message is:

an RRC resume message comprising the downlink data; or

an RRC release message comprising the downlink data.

17. The first base station of claim 10 , wherein the second message comprises the context of the wireless device.

18. A system comprising:

a first base station comprising:

one or more first processors; and

first memory storing instructions that, when executed by the one or more first processors, cause the first base station to:

receive, from a second base station, a first message comprising a context of a wireless device;

send a radio resource control (RRC) message to the wireless device;

determine that reception of the RRC message by the wireless device has failed; and

send, to the second base station and based on the determining, a second message indicating that a connection setup with the wireless device has failed wherein the second message comprises downlink data for the wireless device; and

the second base station, wherein the second base station comprises:

one or more second processors; and

second memory storing instructions that, when executed by the one or more second processors, cause the second base station to:

send the first message; and

receive the second message.