Completion indication of small data transmission
A base station central unit control plane (CU-CP) receives, from a base station distributed unit (DU), an indication of completion of a small data transmission (SDT) procedure of a wireless device. The base station CU-CP sends, to the wireless device via the base station DU, a radio resource control (RRC) release message based on the indication of the completion.
1. A method comprising:
receiving, by a base station central unit control plane (CU-CP) from a base station distributed unit (DU), a radio resource control (RRC) resume request message for a small data transmission (SDT) procedure of a wireless device;
receiving, by the base station CU-CP from the base station DU, an indication message indicating inactivity notification and completion of the SDT procedure; and
sending, by the base station CU-CP to the wireless device via the base station DU, a radio resource control (RRC) release message based on the indication message.
2. The method of claim 1 , wherein the RRC request message is received by the base station CU-CP from the wireless device via the base station DU.
3. The method of claim 2 , wherein the indication message comprises an information element indicating a size of downlink data to transmit to the wireless device.
4. The method of claim 1 , wherein the sending the RRC release message is based on the completion of the SDT procedure.
5. The method of claim 4 , further comprising initiating, by the base station CU-CP, an RRC release procedure based on the completion of the SDT procedure, wherein the RRC release procedure comprises the sending the RRC release message.
6. The method of claim 1 , wherein the RRC release message indicates that the wireless device stays in an RRC inactive state or an RRC idle state.
7. The method of claim 1 , wherein the RRC release message comprises configuration parameters for suspension of an RRC connection.
8. The method of claim 1 , wherein the sending the RRC release message comprises sending the RRC release message within a context release command message.
9. The method of claim 1 , wherein an indication message comprising the indication of the completion of the SDT procedure comprises a bearer identifier of a bearer associated with the completion of the SDT procedure.
10. The method of claim 1 , wherein the SDT procedure comprises one or more of:
an initial uplink data transmission;
an initial downlink data transmission; or
at least one subsequent data transmission.
11. A method comprising:
sending, by a base station distributed unit (DU) to a base station central unit control plane (CU-CP), a radio resource control (RRC) resume request message for a small data transmission (SDT) procedure of a wireless device;
receiving, by the base station DU, data associated with the SDT procedure;
determining, based on the receiving the data, completion of the SDT procedure; and
sending, by the base station DU to the base station CU-CP, an indication message indicating inactivity notification and the completion of the SDT procedure.
12. The method of claim 11 , further comprising receiving, by the base station DU from the base station CU-CP, a context release command message indicating releasing an RRC connection of the wireless device.
13. The method of claim 12 , wherein the context release command message comprises a radio resource control (RRC) release message associated with the wireless device.
14. The method of claim 13 , further comprising sending, by the base station DU to the wireless device, the RRC release message.
15. The method of claim 14 , wherein the sending the RRC release message is based on the completion of the SDT procedure.
16. The method of claim 13 , wherein the RRC release message indicates that the wireless device stays in an RRC inactive state or an RRC idle state.
17. The method of claim 13 , wherein the RRC release message comprises configuration parameters for suspension of the RRC connection.
18. The method of claim 11 , further comprising receiving, by the base station DU, the RRC request message from the wireless device.
19. The method of claim 18 , wherein the indication message comprises an information element indicating a size of downlink data to transmit to the wireless device.
20. A system comprising:
a base station distributed unit (DU) comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station DU to perform operations comprising:
sending, to a base station central unit control plane (CU-CP), a radio resource control (RRC) resume request message for a small data transmission (SDT) procedure of a wireless device;
receiving data associated with the SDT procedure;
determining, based on the receiving the data, completion of the SDT procedure; and
sending, to the base station CU-CP, an indication message indicating inactivity notification and the completion of the SDT procedure; and
the base station CU-CP, wherein the base station CU-CP comprises: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station CU-CP to:
receive, from the base station DU, the RRC resume request message;
receive, from the base station DU, the indication message indicating the inactivity notification and the completion of the SDT procedure; and
send, to the wireless device via the base station DU, a radio resource control (RRC) release message based on the indication message.