Method and device for discarding wireless link control service data unit in wireless communication system

A method performed by a radio link control (RLC) receiving side in a wireless communication system, the method comprising:

• receiving an RLC protocol data unit (PDU) from a lower layer;
• identifying whether the RLC PDU includes a sequence number (SN) of at least one discarded RLC service data unit (SDU);
• performing discarding of the RLC SDU corresponding to the SN in the RLC PDU;
• and
• processing reception of the RLC SDU corresponding to the SN as completed,
• wherein the at least one RLC SDU comprises at least one RLC SDU segment.

A radio link control (RLC) transmitting side in a wireless communication system, the RLC transmitting side comprising:

• a transceiver;
• and
• at least one controller coupled with the transceiver,
• wherein the at least one controller is configured to:
• receive configuration information associated with an RLC layer from a base station;
• receive, from a packet data convergence protocol (PDCP) layer, a message for requesting discarding of at least one RLC service data unit (SDU), and
• discard the at least one RLC SDU based on the configuration information,
• wherein the at least one RLC SDU comprises at least one RLC SDU segment.

A radio link control (RLC) receiving side in a wireless communication system, the RLC receiving side comprising:

• a transceiver;
• and
• at least one controller coupled with the transceiver,
• wherein the at least one controller is configured to:
• receive an RLC protocol data unit (PDU) from a lower layer;
• identify whether the RLC PDU includes a sequence number (SN) of at least one discarded RLC service data unit (SDU);
• perform discarding of the RLC SDU corresponding to the SN in the RLC PDU;
• and
• process reception of the RLC SDU corresponding to the SN as completed, and
• wherein the at least one RLC SDU comprises at least one RLC SDU segment.