Controlling an indication of user data in a buffer of a UE for small data transmission

A computer program stored in a non-transitory storage medium for controlling an indication of user data in a buffer of a user equipment (UE) for Small Data Transmission (SDT) in a wireless communications network when the UE is in inactive mode, the computer program comprising instructions, which when executed by a processor, causes the processor to perform actions, the actions comprising:

• obtaining pending user data for the SDT into the buffer of the UE;
• based on a threshold value related to an amount of the user data for the SDT, determining whether or not to include the indication of user data in the buffer into a first uplink grant allocation transmission for the SDT to be transmitted to a network node;
• when the indication of user data in the buffer is not included in the transmitted first uplink grant allocation transmission, this indicates to the network node that the amount of user data left in the buffer is less than the threshold value minus the first allocated grant transmission size;
• and
• when the indication of user data in the buffer is included in the transmitted first uplink grant allocation transmission, the indication indicates to the network node how many further transmissions are needed for transmitting rest of the pending user data not included when transmitted in the first uplink grant allocation transmission.

A User Equipment (UE) configured to control an indication of user data in a buffer of the UE for Small Data Transmission (SDT) in a wireless communications network when the UE is in inactive mode, wherein the UE is configured to:

• obtain pending user data for the SDT into the buffer of the UE;
• based on a threshold value related to an amount of the user data for the SDT, determine whether or not to include the indication of user data in the buffer into a first uplink grant allocation transmission for the SDT to be transmitted to a network node;
• when the indication of user data in the buffer is not included in the transmitted first uplink grant allocation transmission, this is adapted to indicate to the network node that the amount of user data left in the buffer is less than the threshold value minus the first allocated grant transmission size;
• and
• when the indication of user data in the buffer is included in the transmitted first uplink grant allocation transmission, the indication is adapted to indicate to the network node how many further transmissions are needed for transmitting rest of the pending user data not included when transmitted in the first uplink grant allocation transmission.