Method and apparatus for transmitting data unit on RRC inactive state in wireless communication system

1 . A method for transmitting uplink data by a user equipment (UE) in a wireless communication system, the method comprising:

configuring a Packet Data Convergence Protocol (PDCP) entity, at least one Acknowledged Mode (AM) Radio Link Control (RLC) entities and a non-AM RLC entity, wherein the PDCP entity is associated with both the at least one AM RLC entities and the non-AM RLC entity;

transmitting a first uplink data using the at least one AM RLC entities in a Radio Resource Control (RRC) CONNECTED state;

receiving a RRC INACTIVE transition command; and

transmitting a second uplink data using the non-AM RLC entity in the RRC INACTIVE state.

2 . The method of claim 1 , wherein the non-AM RLC entity does not perform retransmission.

3 . The method of claim 1 , wherein the non-AM RLC entity comprises at least one of a Transparent Mode (TM) RLC entity and an Unacknowledged Mode (UM) RLC entity.

4 . The method of claim 1 , wherein the non-AM RLC entity is shared with another PDCP entity of the UE.

5 . A user equipment (UE) in a wireless communication system, the UE comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:

configuring a Packet Data Convergence Protocol (PDCP) entity, at least one Acknowledged Mode (AM) Radio Link Control (RLC) entities and a non-AM RLC entity, wherein the PDCP entity is associated with both the at least one AM RLC entities and the non-AM RLC entity;

transmitting a first uplink data using the at least one AM RLC entities in a Radio Resource Control (RRC) CONNECTED state;

receiving a RRC INACTIVE transition command; and

transmitting a second uplink data using the non-AM RLC entity in the RRC INACTIVE state.

6 . The UE of claim 5 , wherein the non-AM RLC entity does not perform retransmission.

7 . The UE of claim 5 , wherein the non-AM RLC entity comprises at least one of a Transparent Mode (TM) RLC entity and an Unacknowledged Mode (UM) RLC entity.

8 . The UE of claim 5 , wherein the non-AM RLC entity is shared with another PDCP entity of the UE.

9 . An apparatus for a user equipment (UE), the apparatus comprising:

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:

configuring a Packet Data Convergence Protocol (PDCP) entity, at least one Acknowledged Mode (AM) Radio Link Control (RLC) entities and a non-AM RLC entity, wherein the PDCP entity is associated with both the at least one AM RLC entities and the non-AM RLC entity;

transmitting a first uplink data using the at least one AM RLC entities in a Radio Resource Control (RRC) CONNECTED state;

receiving a RRC INACTIVE transition command; and

transmitting a second uplink data using the non-AM RLC entity in the RRC INACTIVE state.

10 . A non-transitory computer readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user equipment (UE), the operations comprising:

configuring a Packet Data Convergence Protocol (PDCP) entity, at least one Acknowledged Mode (AM) Radio Link Control (RLC) entities and a non-AM RLC entity, wherein the PDCP entity is associated with both the at least one AM RLC entities and the non-AM RLC entity;

transmitting a first uplink data using the at least one AM RLC entities in a Radio Resource Control (RRC) CONNECTED state;

receiving a RRC INACTIVE transition command; and

transmitting a second uplink data using the non-AM RLC entity in the RRC INACTIVE state.