Radio terminal, base station, and methods and non-transitory computer-readable media therefor

A method for a radio terminal, the method comprising:

• controlling state transitions of the radio terminal among RRC_CONNECTED, RRC_INACTIVE, and RRC_IDLE states;
• and
• supporting data transmission in the RRC_INACTIVE state, and
• in a case where the radio terminal is in the RRC_INACTIVE state, a current cell that the radio terminal has camped on is different from a first cell in which a state transition from the RRC_CONNECTED state to the RRC_INACTIVE state was performed, and the current cell satisfies a first condition, allowing the radio terminal to perform data transmission in the current cell before transitioning to the RRC_CONNECTED state.

A method of a User Equipment (UE), the method comprising:

• receiving, from a network, system information including configuration information for small data transmission in an RRC_INACTIVE state;
• and
• determining, based on a plurality of conditions, whether to perform the small data transmission,
• wherein the plurality of conditions includes a first condition related to a serving cell,
• wherein the plurality of conditions includes a second condition related to a data volume threshold included in the system information, and
• wherein the second condition is that a data volume of pending uplink data for the small data transmission is less than or equal to the data volume threshold.

A method of a User Equipment (UE), the method comprising:

• receiving, from a network, system information including configuration information for small data transmission in an RRC_INACTIVE state;
• determining, based on a plurality of conditions, whether to perform the small data transmission;
• triggering an update procedure of a RAN-based Notification Area (RNA);
• and
• initiating the small data transmission in a cell of the RNA,
• wherein the plurality of conditions includes a first condition related to a serving cell, and
• wherein the plurality of conditions includes a second condition related to a data volume threshold included in the system information.