Method and apparatus for performing connection resumption in wireless communication system

A base station comprising:

• a transceiver,
• a memory, and
• a controller coupled to the transceiver and the memory, wherein the controller is co nfigured to cause the base station to:
• receive, from a wireless device via a first cell, a first Radio Resource Contr ol (RRC) message, wherein the first RRC message comprises one or more capabilit y parameters,
• transmit, to the wireless device, at least one second RRC message that caus es an RRC state transition to an RRC inactive state, wherein the at least one second RRC message comprises first configuration information for small data transmission (SDT);
• and
• while the wireless device is in the RRC inactive state:
• receive, via a second cell and based on a first random access resourc e, a first random access preamble associated with a first SDT procedure;
• receive, via the second cell, a third RRC message requesting a first RRC connection resumption, wherein a resume cause field of the third RRC message is set to a first value of a plurality of resume cause field values;
• receive, via the second cell, data associated with the first SDT proce dure;
• receive, via the second cell, a fourth RRC message requesting a see ond RRC connection resumption, wherein a resume cause field of the fourth RRC message is set to a second value, and wherein the second value indicat es that the second RRC connection resumption is for a second SDT procedu re different from the first SDT procedure;
• and
• transmit, via the second cell, data associated with the second SDT p rocedure.