Small data transmission
A wireless device, in a radio resource control (RRC) idle state or RRC inactive state, transmits, to a base station, a message. The message comprises first data associated with a small data transmission (SDT) procedure and an RRC request message. While the wireless device is in the RRC idle state or RRC inactive state, the wireless device receives, from the base station, an indication of an uplink resource, transmits, via the uplink resource, second data associated with the SDT procedure, and receives, from the base station and after the transmitting the second data, an RRC release message.
1. A method comprising:
receiving, by a wireless device from a base station, a first radio resource control (RRC) release message comprising a suspend configuration associated with a first bandwidth part (BWP); and
while the wireless device is in an RRC idle state or an RRC inactive state:
transmitting, by the wireless device, based on the suspend configuration:
first data associated with a small data transmission (SDT) procedure; and
an RRC message requesting to resume an RRC connection;
receiving, by the wireless device, a second RRC release message comprising a subsequent configuration associated with a second BWP; and
transmitting via the second BWP, by the wireless device based on the subsequent configuration, second data associated with the SDT procedure.
2. The method of claim 1 , further comprising transitioning, by the wireless device, based on the first RRC release message, to the RRC idle state or the RRC inactive state.
3. The method of claim 1 , wherein the first data associated with the SDT procedure and/or the RRC message requesting to resume the RRC connection are included in a message comprising a buffer status report (BSR) for the second data associated with the SDT procedure.
4. The method of claim 1 , wherein the first data associated with the SDT procedure and/or the RRC message requesting to resume the RRC connection are included in a Msg3.
5. The method of claim 1 , wherein the second RRC release message is included in a Msg4.
6. The method of claim 1 , wherein the second data is included in a Msg5.
7. The method of claim 1 , wherein the second RRC release message indicates terminating of the SDT procedure.
8. The method of claim 1 , further comprising terminating the SDT based on the second RRC release message.
9. The method of claim 1 , wherein the transmitting of the first data is via one or more data radio bearers (DRBs).
10. The method of claim 1 , wherein the transmitting of the first data is based on one or more of:
integrity protection of the first data; and
ciphering of the first data.
11. A wireless device comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive, from a base station, a first radio resource control (RRC) release message comprising a suspend configuration associated with a first bandwidth part (BWP);
while in an RRC idle state or an RRC inactive state:
transmit, based on the suspend configuration:
first data associated with a small data transmission (SDT) procedure; and
an RRC message requesting to resume an RRC connection;
receive a second RRC release message comprising a subsequent configuration associated with a second BWP; and
transmit via the second BWP, based on the subsequent configuration, second data associated with the SDT procedure.
12. The wireless device of claim 11 , wherein the instructions further cause the wireless device to transition, based on the first RRC release message, to the RRC idle state or the RRC inactive state.
13. The wireless device of claim 11 , wherein the first data associated with the SDT procedure and/or the RRC message requesting to resume the RRC connection are included in a message comprising a buffer status report (BSR) for the second data associated with the SDT procedure.
14. The wireless device of claim 11 , wherein the first data associated with the SDT procedure and/or the RRC message requesting to resume the RRC connection are included in a Msg3.
15. The wireless device of claim 11 , wherein the second RRC release message is included in a Msg4.
16. The wireless device of claim 11 , wherein the second data is included in a Msg5.
17. The wireless device of claim 11 , wherein the second RRC release message indicates terminating of the SDT procedure.
18. The wireless device of claim 11 , wherein the instructions further cause the wireless device to terminate the SDT based on the second RRC release message.
19. The wireless device of claim 11 , wherein the transmitting of the first data is via one or more data radio bearers (DRBs).
20. A system, comprising:
a wireless device comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive, from a base station, a first radio resource control (RRC) release message comprising a suspend configuration associated with a first bandwidth part (BWP);
while in an RRC idle state or an RRC inactive state:
transmit, based on the suspend configuration:
first data associated with a small data transmission (SDT) procedure; and
an RRC message requesting to resume an RRC connection;
receive a second RRC release message comprising a subsequent configuration associated with a second BWP; and
transmit via the second BWP, based on the subsequent configuration, second data associated with the SDT procedure
a base station comprising: one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station to:
transmit the first RRC release message;
receive the first data and the RRC message requesting to resume the RRC connection;
transmit the second RRC release message; and
receive the second data.